// CodeMirror, copyright (c) by Marijn Haverbeke and others Distributed under an
// MIT license: http://codemirror.net/LICENSE This is CodeMirror
// (http://codemirror.net), a code editor implemented in JavaScript on top of
// the browser's DOM.
//
// You can find some technical background for some of the code below at
// http://marijnhaverbeke.nl/blog/#cm-internals .

(function (mod) {
    if (typeof exports == "object" && typeof module == "object") { // CommonJS
        module.exports = mod();
    } else if (typeof define == "function" && define.amd) { // AMD
        return define([], mod);
    } else { // Plain browser env
        this.codeMirror = mod();
    }
})(function () {
    "use strict";

    // BROWSER SNIFFING Kludges for bugs and behavior differences that can't be
    // feature detected are enabled based on userAgent etc sniffing.

    var gecko = /gecko\/\d/i.test(navigator.userAgent);
    // ie_uptoN means Internet Explorer version N or lower
    var ie_upto10 = /MSIE \d/.test(navigator.userAgent);
    var ie_11up = /Trident\/(?:[7-9]|\d{2,})\..*rv:(\d+)/.exec(navigator.userAgent);
    var ie = ie_upto10 || ie_11up;
    var ie_version = ie && (ie_upto10
        ? document.documentMode || 6
        : ie_11up[1]);
    var webkit = /WebKit\//.test(navigator.userAgent);
    var qtwebkit = webkit && /Qt\/\d+\.\d+/.test(navigator.userAgent);
    var chrome = /Chrome\//.test(navigator.userAgent);
    var presto = /Opera\//.test(navigator.userAgent);
    var safari = /Apple Computer/.test(navigator.vendor);
    var khtml = /KHTML\//.test(navigator.userAgent);
    var mac_geMountainLion = /Mac OS X 1\d\D([8-9]|\d\d)\D/.test(navigator.userAgent);
    var phantom = /PhantomJS/.test(navigator.userAgent);

    var ios = /AppleWebKit/.test(navigator.userAgent) && /Mobile\/\w+/.test(navigator.userAgent);
    // This is woefully incomplete. Suggestions for alternative methods welcome.
    var mobile = ios || /Android|webOS|BlackBerry|Opera Mini|Opera Mobi|IEMobile/i.test(navigator.userAgent);
    var mac = ios || /Mac/.test(navigator.platform);
    var windows = /win/i.test(navigator.platform);

    var presto_version = presto && navigator
        .userAgent
        .match(/Version\/(\d*\.\d*)/);
    if (presto_version) {
        presto_version = Number(presto_version[1]);
    }
    if (presto_version && presto_version >= 15) {
        presto = false;
        webkit = true;
    }
    // Some browsers use the wrong event properties to signal cmd/ctrl on OS X
    var flipCtrlCmd = mac && (qtwebkit || presto && (presto_version == null || presto_version < 12.11));
    var captureRightClick = gecko || (ie && ie_version >= 9);

    // Optimize some code when these features are not used.
    var sawReadOnlySpans  = false,
        sawCollapsedSpans = false;

    // EDITOR CONSTRUCTOR A CodeMirror instance represents an editor. This is the
    // object that user code is usually dealing with.

    function codeMirror(place, options) {
        if (!(this instanceof codeMirror)) {
            return new codeMirror(place, options);
        }

        this.options = options = options
            ? copyObj(options)
            : {};
        // Determine effective options based on given values and defaults.
        copyObj(defaults, options, false);
        setGuttersForLineNumbers(options);

        var doc = options.value;
        if (typeof doc == "string") {
            doc = new Doc(doc, options.mode);
        }
        this.doc = doc;

        var display = this.display = new Display(place, doc);
        display.wrapper.CodeMirror = this;
        updateGutters(this);
        themeChanged(this);
        if (options.lineWrapping) {
            this.display.wrapper.className += " CodeMirror-wrap";
        }
        if (options.autofocus && !mobile) {
            focusInput(this);
        }
        initScrollbars(this);

        this.state = {
            cutIncoming  : false, // help recognize paste/cut edits in readInput
            draggingText : false,
            focused      : false,
            highlight    : new Delayed(), // stores highlight worker timeout
            keyMaps      : [], // stores maps added by addKeyMap
            keySeq       : null, // Unfinished key sequence
            modeGen      : 0, // bumped when mode/overlay changes, used to invalidate highlighting info
            overlays     : [], // highlighting overlays, as added by addOverlay
            overwrite    : false,
            pasteIncoming: false,
            suppressEdits: false // used to disable editing during key handlers when in readOnly mode
        };

        // Override magic textarea content restore that IE sometimes does on our hidden
        // textarea on reload
        if (ie && ie_version < 11) {
            setTimeout(bind(resetInput, this, true), 20);
        }

        registerEventHandlers(this);
        ensureGlobalHandlers();

        startOperation(this);
        this.curOp.forceUpdate = true;
        attachDoc(this, doc);

        if ((options.autofocus && !mobile) || activeElt() == display.input) {
            setTimeout(bind(onFocus, this), 20);
        } else {
            onBlur(this);
        }

        for (var opt in optionHandlers) {
            if (optionHandlers.hasOwnProperty(opt)) {
                optionHandlers[opt](this, options[opt], Init);
            }
        }
        maybeUpdateLineNumberWidth(this);
        for (var i = 0; i < initHooks.length; i += 1) {
            initHooks[i](this);
        }
        endOperation(this);
        // Suppress optimizelegibility in Webkit, since it breaks text measuring on line
        // wrapping boundaries.
        if (webkit && options.lineWrapping && getComputedStyle(display.lineDiv).textRendering == "optimizelegibility") {
            display.lineDiv.style.textRendering = "auto";
        }
    }

    // DISPLAY CONSTRUCTOR The display handles the DOM integration, both for input
    // reading and content drawing. It holds references to DOM nodes and
    // display-related state.

    function Display(place, doc) {
        var d = this;

        // The semihidden textarea that is focused when the editor is focused, and
        // receives input.
        var input = d.input = elt("textarea", null, null, "position: absolute; padding: 0; width: 1px; height: 1em; outline: none");
        // The textarea is kept positioned near the cursor to prevent the fact that
        // it'll be scrolled into view on input from scrolling our fake cursor out of
        // view. On webkit, when wrap=off, paste is very slow. So make the area wide
        // instead.
        if (webkit) {
            input.style.width = "1000px";
        } else {
            input.setAttribute("wrap", "off");
        }
        // If border: 0; -- iOS fails to open keyboard (issue #1287)
        if (ios) {
            input.style.border = "1px solid black";
        }
        input.setAttribute("autocorrect", "off");
        input.setAttribute("autocapitalize", "off");
        input.setAttribute("spellcheck", "false");

        // Wraps and hides input textarea
        d.inputDiv        = elt("div", [input], null, "overflow: hidden; position: relative; width: 3px; height: 0px;");
        // Covers bottom-right square when both scrollbars are present.
        d.scrollbarFiller = elt("div", null, "CodeMirror-scrollbar-filler");
        d
            .scrollbarFiller
            .setAttribute("not-content", "true");
        // Covers bottom of gutter when coverGutterNextToScrollbar is on and h scrollbar
        // is present.
        d.gutterFiller = elt("div", null, "CodeMirror-gutter-filler");
        d
            .gutterFiller
            .setAttribute("not-content", "true");
        // Will contain the actual code, positioned to cover the viewport.
        d.lineDiv      = elt("div", null, "CodeMirror-code");
        // Elements are added to these to represent selection and cursors.
        d.selectionDiv = elt("div", null, null, "position: relative; z-index: 1");
        d.cursorDiv    = elt("div", null, "CodeMirror-cursors");
        // A visibility: hidden element used to find the size of things.
        d.measure      = elt("div", null, "CodeMirror-measure");
        // When lines outside of the viewport are measured, they are drawn in this.
        d.lineMeasure  = elt("div", null, "CodeMirror-measure");
        // Wraps everything that needs to exist inside the vertically-padded coordinate
        // system
        d.lineSpace    = elt("div", [
            d.measure, d.lineMeasure, d.selectionDiv, d.cursorDiv, d.lineDiv
        ], null, "position: relative; outline: none");
        // Moved around its parent to cover visible view.
        d.mover        = elt("div", [elt("div", [d.lineSpace], "CodeMirror-lines")], null, "position: relative");
        // Set to the height of the document, allowing scrolling.
        d.sizer        = elt("div", [d.mover], "CodeMirror-sizer");
        d.sizerWidth   = null;
        // Behavior of elts with overflow: auto and padding is inconsistent across
        // browsers. This is used to ensure the scrollable area is big enough.
        d.heightForcer = elt("div", null, null, "position: absolute; height: " +
                scrollerGap + "px; width: 1px;");
        // Will contain the gutters, if any.
        d.gutters      = elt("div", null, "CodeMirror-gutters");
        d.lineGutter   = null;
        // Actual scrollable element.
        d.scroller     = elt("div", [
            d.sizer, d.heightForcer, d.gutters
        ], "CodeMirror-scroll");
        d
            .scroller
            .setAttribute("tabIndex", "-1");
        // The element in which the editor lives.
        d.wrapper = elt("div", [
            d.inputDiv, d.scrollbarFiller, d.gutterFiller, d.scroller
        ], "CodeMirror");

        // Work around IE7 z-index bug (not perfect, hence IE7 not really being
        // supported)
        if (ie && ie_version < 8) {
            d.gutters.style.zIndex        = -1;
            d.scroller.style.paddingRight = 0;
        }
        // Needed to hide big blue blinking cursor on Mobile Safari
        if (ios) {
            input.style.width = "0px";
        }
        if (!webkit) {
            d.scroller.draggable = true;
        }
        // Needed to handle Tab key in KHTML
        if (khtml) {
            d.inputDiv.style.height   = "1px";
            d.inputDiv.style.position = "absolute";
        }

        if (place) {
            if (place.appendChild) {
                place.appendChild(d.wrapper);
            } else {
                place(d.wrapper);
            }
        }

        // Current rendered range (may be bigger than the view window).
        d.viewFrom            = d.viewTo = doc.first;
        d.reportedViewFrom    = d.reportedViewTo = doc.first;
        // Information about the rendered lines.
        d.view                = [];
        d.renderedView        = null;
        // Holds info about a single rendered line when it was rendered for measurement,
        // while not in view.
        d.externalMeasured    = null;
        // Empty space (in pixels) above the view
        d.viewOffset          = 0;
        d.lastWrapHeight      = d.lastWrapWidth = 0;
        d.updateLineNumbers   = null;

        d.nativeBarWidth      = d.barHeight = d.barWidth = 0;
        d.scrollbarsClipped   = false;

        // Used to only resize the line number gutter when necessary (when the amount of
        // lines crosses a boundary that makes its width change)
        d.lineNumWidth        = d.lineNumInnerWidth = d.lineNumChars = null;
        // See readInput and resetInput
        d.prevInput           = "";
        // Set to true when a non-horizontal-scrolling line widget is added. As an
        // optimization, line widget aligning is skipped when this is false.
        d.alignWidgets        = false;
        // Flag that indicates whether we expect input to appear real soon now (after
        // some event like 'keypress' or 'input') and are polling intensively.
        d.pollingFast         = false;
        // Self-resetting timeout for the poller
        d.poll                = new Delayed();

        d.cachedCharWidth     = d.cachedTextHeight = d.cachedPaddingH = null;

        // Tracks when resetInput has punted to just putting a short string into the
        // textarea instead of the full selection.
        d.inaccurateSelection = false;

        // Tracks the maximum line length so that the horizontal scrollbar can be kept
        // static when scrolling.
        d.maxLine             = null;
        d.maxLineLength       = 0;
        d.maxLineChanged      = false;

        // Used for measuring wheel scrolling granularity
        d.wheelDX             = d.wheelDY = d.wheelStartX = d.wheelStartY = null;

        // True when shift is held down.
        d.shift               = false;

        // Used to track whether anything happened since the context menu was opened.
        d.selForContextMenu   = null;
    }

    // STATE UPDATES Used to get the editor into a consistent state again when
    // options change.

    function loadMode(cm) {
        cm.doc.mode = codeMirror.getMode(cm.options, cm.doc.modeOption);
        resetModeState(cm);
    }

    function resetModeState(cm) {
        cm
            .doc
            .iter(function (line) {
                if (line.stateAfter) {
                    line.stateAfter = null;
                }
                if (line.styles) {
                    line.styles = null;
                }
            });
        cm.doc.frontier = cm.doc.first;
        startWorker(cm, 100);
        cm.state.modeGen += 1;
        if (cm.curOp) {
            regChange(cm);
        }
    }

    function wrappingChanged(cm) {
        if (cm.options.lineWrapping) {
            addClass(cm.display.wrapper, "CodeMirror-wrap");
            cm.display.sizer.style.minWidth = "";
            cm.display.sizerWidth           = null;
        } else {
            rmClass(cm.display.wrapper, "CodeMirror-wrap");
            findMaxLine(cm);
        }
        estimateLineHeights(cm);
        regChange(cm);
        clearCaches(cm);
        setTimeout(function () {
            updateScrollbars(cm);
        }, 100);
    }

    // Returns a function that estimates the height of a line, to use as first
    // approximation until the line becomes visible (and is thus properly
    // measurable).
    function estimateHeight(cm) {
        var th       = textHeight(cm.display),
            wrapping = cm.options.lineWrapping;
        var perLine = wrapping && Math.max(5, cm.display.scroller.clientWidth / charWidth(cm.display) - 3);
        return function (line) {
            if (lineIsHidden(cm.doc, line)) {
                return 0;
            }

            var widgetsHeight = 0;
            if (line.widgets) {
                for (var i = 0; i < line.widgets.length; i += 1) {
                    if (line.widgets[i].height) {
                        widgetsHeight += line
                            .widgets[i]
                            .height;
                    }
                }

                if (wrapping) {
                    return widgetsHeight + (Math.ceil(line.text.length / perLine) || 1) * th;
                } else {
                    return widgetsHeight + th;
                }
            }
        };
    }

    function estimateLineHeights(cm) {
        var doc = cm.doc,
            est = estimateHeight(cm);
        doc.iter(function (line) {
            var estHeight = est(line);
            if (estHeight != line.height) {
                updateLineHeight(line, estHeight);
            }
        });
    }

    function themeChanged(cm) {
        cm.display.wrapper.className = cm
            .display
            .wrapper
            .className
            .replace(/\s*cm-s-\S+/g, "") + cm
            .options
            .theme
            .replace(/(^|\s)\s*/g, " cm-s-");
        clearCaches(cm);
    }

    function guttersChanged(cm) {
        updateGutters(cm);
        regChange(cm);
        setTimeout(function () {
            alignHorizontally(cm);
        }, 20);
    }

    // Rebuild the gutter elements, ensure the margin to the left of the code
    // matches their width.
    function updateGutters(cm) {
        var gutters = cm.display.gutters,
            specs   = cm.options.gutters;
        removeChildren(gutters);
        for (var i = 0; i < specs.length; i += 1) {
            var gutterClass = specs[i];
            var gElt = gutters.appendChild(elt("div", null, "CodeMirror-gutter " +
                    gutterClass));
            if (gutterClass == "CodeMirror-linenumbers") {
                cm.display.lineGutter = gElt;
                gElt.style.width      = (cm.display.lineNumWidth || 1) + "px";
            }
        }
        gutters.style.display = i
            ? ""
            : "none";
        updateGutterSpace(cm);
    }

    function updateGutterSpace(cm) {
        var width = cm.display.gutters.offsetWidth;
        cm.display.sizer.style.marginLeft = width + "px";
    }

    // Compute the character length of a line, taking into account collapsed ranges
    // (see markText) that might hide parts, and join other lines onto it.
    function lineLength(line) {
        if (line.height == 0) {
            return 0;
        }
        var len = line.text.length,
            merged,
            cur = line;
        while (merged = collapsedSpanAtStart(cur)) {
            var found = merged.find(0, true);
            cur = found.from.line;
            len += found.from.ch - found.to.ch;
        }
        cur = line;
        while (merged = collapsedSpanAtEnd(cur)) {
            var found = merged.find(0, true);
            len -= cur.text.length - found.from.ch;
            cur = found.to.line;
            len += cur.text.length - found.to.ch;
        }
        return len;
    }

    // Find the longest line in the document.
    function findMaxLine(cm) {
        var d   = cm.display,
            doc = cm.doc;
        d.maxLine        = getLine(doc, doc.first);
        d.maxLineLength  = lineLength(d.maxLine);
        d.maxLineChanged = true;
        doc.iter(function (line) {
            var len = lineLength(line);
            if (len > d.maxLineLength) {
                d.maxLineLength = len;
                d.maxLine       = line;
            }
        });
    }

    // Make sure the gutters options contains the element "CodeMirror-linenumbers"
    // when the lineNumbers option is true.
    function setGuttersForLineNumbers(options) {
        var found = indexOf(options.gutters, "CodeMirror-linenumbers");
        if (found == -1 && options.lineNumbers) {
            options.gutters = options
                .gutters
                .concat(["CodeMirror-linenumbers"]);
        } else if (found > -1 && !options.lineNumbers) {
            options.gutters = options
                .gutters
                .slice(0);
            options
                .gutters
                .splice(found, 1);
        }
    }

    // SCROLLBARS Prepare DOM reads needed to update the scrollbars. Done in one
    // shot to minimize update/measure roundtrips.
    function measureForScrollbars(cm) {
        var d       = cm.display,
            gutterW = d.gutters.offsetWidth;
        var docH = Math.round(cm.doc.height + paddingVert(cm.display));
        return {
            barLeft       : cm.options.fixedGutter
                ? gutterW
                : 0,
            clientHeight  : d.scroller.clientHeight,
            clientWidth   : d.scroller.clientWidth,
            docHeight     : docH,
            gutterWidth   : gutterW,
            nativeBarWidth: d.nativeBarWidth,
            scrollHeight  : docH + scrollGap(cm) + d.barHeight,
            scrollWidth   : d.scroller.scrollWidth,
            viewHeight    : d.wrapper.clientHeight,
            viewWidth     : d.wrapper.clientWidth
        };
    }

    function NativeScrollbars(place, scroll, cm) {
        this.cm = cm;
        var vert = this.vert = elt("div", [elt("div", null, null, "min-width: 1px")], "CodeMirror-vscrollbar");
        var horiz = this.horiz = elt("div", [elt("div", null, null, "height: 100%; min-height: 1px")], "CodeMirror-hscrollbar");
        place(vert);
        place(horiz);

        on(vert, "scroll", function () {
            if (vert.clientHeight) {
                scroll(vert.scrollTop, "vertical");
            }
        });
        on(horiz, "scroll", function () {
            if (horiz.clientWidth) {
                scroll(horiz.scrollLeft, "horizontal");
            }
        });

        this.checkedOverlay = false;
        // Need to set a minimum width to see the scrollbar on IE7 (but must not set it
        // on IE8).
        if (ie && ie_version < 8) {
            this.horiz.style.minHeight = this.vert.style.minWidth = "18px";
        }
    }

    NativeScrollbars.prototype = copyObj({
        clear        : function () {
            var parent = this.horiz.parentNode;
            parent.removeChild(this.horiz);
            parent.removeChild(this.vert);
        },
        overlayHack  : function () {
            var w = mac && !mac_geMountainLion
                ? "12px"
                : "18px";
            this.horiz.style.minHeight = this.vert.style.minWidth = w;
            var self = this;
            var barMouseDown = function (e) {
                if (e_target(e) != self.vert && e_target(e) != self.horiz) {
                    operation(self.cm, onMouseDown)(e);
                };
            }
            on(this.vert, "mousedown", barMouseDown);
            on(this.horiz, "mousedown", barMouseDown);
        },
        setScrollLeft: function (pos) {
            if (this.horiz.scrollLeft != pos) {
                this.horiz.scrollLeft = pos;
            }
        },
        setScrollTop : function (pos) {
            if (this.vert.scrollTop != pos) {
                this.vert.scrollTop = pos;
            }
        },
        update       : function (measure) {
            var needsH = measure.scrollWidth > measure.clientWidth + 1;
            var needsV = measure.scrollHeight > measure.clientHeight + 1;
            var sWidth = measure.nativeBarWidth;

            if (needsV) {
                this.vert.style.display = "block";
                this.vert.style.bottom  = needsH
                    ? sWidth + "px"
                    : "0";
                var totalHeight = measure.viewHeight - (needsH
                    ? sWidth
                    : 0);
                // A bug in IE8 can cause this value to be negative, so guard it.
                this.vert.firstChild.style.height = Math.max(0, measure.scrollHeight - measure.clientHeight + totalHeight) + "px";
            } else {
                this.vert.style.display           = "";
                this.vert.firstChild.style.height = "0";
            }

            if (needsH) {
                this.horiz.style.display = "block";
                this.horiz.style.right   = needsV
                    ? sWidth + "px"
                    : "0";
                this.horiz.style.left    = measure.barLeft + "px";
                var totalWidth = measure.viewWidth - measure.barLeft - (needsV
                    ? sWidth
                    : 0);
                this.horiz.firstChild.style.width = (measure.scrollWidth - measure.clientWidth + totalWidth) + "px";
            } else {
                this.horiz.style.display          = "";
                this.horiz.firstChild.style.width = "0";
            }

            if (!this.checkedOverlay && measure.clientHeight > 0) {
                if (sWidth == 0) {
                    this.overlayHack();
                }
                this.checkedOverlay = true;
            }

            return {
                bottom: needsH
                    ? sWidth
                    : 0,
                right : needsV
                    ? sWidth
                    : 0
            };
        }
    }, NativeScrollbars.prototype);

    function NullScrollbars() {}

    NullScrollbars.prototype  = copyObj({
        clear        : function () {},
        setScrollLeft: function () {},
        setScrollTop : function () {},
        update       : function () {
            return {bottom: 0, right: 0};
        }
    }, NullScrollbars.prototype);

    codeMirror.scrollbarModel = {
        "native": NativeScrollbars,
        "null"  : NullScrollbars
    };

    function initScrollbars(cm) {
        if (cm.display.scrollbars) {
            cm
                .display
                .scrollbars
                .clear();
            if (cm.display.scrollbars.addClass) {
                rmClass(cm.display.wrapper, cm.display.scrollbars.addClass);
            }
        }

        cm.display.scrollbars = new codeMirror.scrollbarModel[cm.options.scrollbarStyle](function (node) {
            cm
                .display
                .wrapper
                .insertBefore(node, cm.display.scrollbarFiller);
            on(node, "mousedown", function () {
                if (cm.state.focused) {
                    setTimeout(bind(focusInput, cm), 0);
                }
            });
            node.setAttribute("not-content", "true");
        }, function (pos, axis) {
            if (axis == "horizontal") {
                setScrollLeft(cm, pos);
            } else {
                setScrollTop(cm, pos);
            }
        }, cm);
        if (cm.display.scrollbars.addClass) {
            addClass(cm.display.wrapper, cm.display.scrollbars.addClass);
        }
    }

    function updateScrollbars(cm, measure) {
        if (!measure) {
            measure = measureForScrollbars(cm);
        }
        var startWidth  = cm.display.barWidth,
            startHeight = cm.display.barHeight;
        updateScrollbarsInner(cm, measure);
        for (var i = 0; i < 4 && startWidth != cm.display.barWidth || startHeight != cm.display.barHeight; i += 1) {
            if (startWidth != cm.display.barWidth && cm.options.lineWrapping) {
                updateHeightsInViewport(cm);
            }
            updateScrollbarsInner(cm, measureForScrollbars(cm));
            startWidth  = cm.display.barWidth;
            startHeight = cm.display.barHeight;
        }
    }

    // Re-synchronize the fake scrollbars with the actual size of the content.
    function updateScrollbarsInner(cm, measure) {
        var d = cm.display;
        var sizes = d
            .scrollbars
            .update(measure);

        d.sizer.style.paddingRight  = (d.barWidth = sizes.right) + "px";
        d.sizer.style.paddingBottom = (d.barHeight = sizes.bottom) + "px";

        if (sizes.right && sizes.bottom) {
            d.scrollbarFiller.style.display = "block";
            d.scrollbarFiller.style.height  = sizes.bottom + "px";
            d.scrollbarFiller.style.width   = sizes.right + "px";
        } else {
            d.scrollbarFiller.style.display = "";
        }
        if (sizes.bottom && cm.options.coverGutterNextToScrollbar && cm.options.fixedGutter) {
            d.gutterFiller.style.display = "block";
            d.gutterFiller.style.height  = sizes.bottom + "px";
            d.gutterFiller.style.width   = measure.gutterWidth + "px";
        } else {
            d.gutterFiller.style.display = "";
        }
    }

    // Compute the lines that are visible in a given viewport (defaults the the
    // current scroll position). viewport may contain top, height, and ensure (see
    // op.scrollToPos) properties.
    function visibleLines(display, doc, viewport) {
        var top = viewport && viewport.top != null
            ? Math.max(0, viewport.top)
            : display.scroller.scrollTop;
        top = Math.floor(top - paddingTop(display));
        var bottom = viewport && viewport.bottom != null
            ? viewport.bottom
            : top + display.wrapper.clientHeight;

        var from = lineAtHeight(doc, top),
            to   = lineAtHeight(doc, bottom);
        // Ensure is a {from: {line, ch}, to: {line, ch}} object, and forces those lines
        // into the viewport (if possible).
        if (viewport && viewport.ensure) {
            var ensureFrom = viewport.ensure.from.line,
                ensureTo   = viewport.ensure.to.line;
            if (ensureFrom < from) {
                from = ensureFrom;
                to   = lineAtHeight(doc, heightAtLine(getLine(doc, ensureFrom)) + display.wrapper.clientHeight);
            } else if (Math.min(ensureTo, doc.lastLine()) >= to) {
                from = lineAtHeight(doc, heightAtLine(getLine(doc, ensureTo)) - display.wrapper.clientHeight);
                to   = ensureTo;
            }
        }
        return {
            from: from,
            to  : Math.max(to, from + 1)
        };
    }

    // LINE NUMBERS Re-align line numbers and gutter marks to compensate for
    // horizontal scrolling.
    function alignHorizontally(cm) {
        var display = cm.display,
            view    = display.view;
        if (!display.alignWidgets && (!display.gutters.firstChild || !cm.options.fixedGutter)) {
            return;
        }
        var comp = compensateForHScroll(display) - display.scroller.scrollLeft + cm.doc.scrollLeft;
        var gutterW = display.gutters.offsetWidth,
            left    = comp + "px";
        for (var i = 0; i < view.length; i += 1) {
            if (!view[i].hidden) {
                if (cm.options.fixedGutter && view[i].gutter) {
                    view[i].gutter.style.left = left;
                }
                var align = view[i].alignable;
                if (align) {
                    for (var j = 0; j < align.length; j += 1) {
                        align[j].style.left = left;
                    }
                }
            }
            if (cm.options.fixedGutter) {
                display.gutters.style.left = (comp + gutterW) + "px";
            }
        }
    }

    // Used to ensure that the line number gutter is still the right size for the
    // current document size. Returns true when an update is needed.
    function maybeUpdateLineNumberWidth(cm) {
        if (!cm.options.lineNumbers) {
            return false;
        }
        var doc     = cm.doc,
            last    = lineNumberFor(cm.options, doc.first + doc.size - 1),
            display = cm.display;
        if (last.length != display.lineNumChars) {
            var test = display
                .measure
                .appendChild(elt("div", [elt("div", last)], "CodeMirror-linenumber CodeMirror-gutter-elt"));
            var innerW  = test.firstChild.offsetWidth,
                padding = test.offsetWidth - innerW;
            display.lineGutter.style.width = "";
            display.lineNumInnerWidth      = Math.max(innerW, display.lineGutter.offsetWidth - padding);
            display.lineNumWidth           = display.lineNumInnerWidth + padding;
            display.lineNumChars           = display.lineNumInnerWidth
                ? last.length
                : -1;
            display.lineGutter.style.width = display.lineNumWidth + "px";
            updateGutterSpace(cm);
            return true;
        }
        return false;
    }

    function lineNumberFor(options, i) {
        return String(options.lineNumberFormatter(i + options.firstLineNumber));
    }

    // Computes display.scroller.scrollLeft + display.gutters.offsetWidth, but using
    // getBoundingClientRect to get a sub-pixel-accurate result.
    function compensateForHScroll(display) {
        return display
            .scroller
            .getBoundingClientRect()
            .left - display
            .sizer
            .getBoundingClientRect()
            .left;
    }

    // DISPLAY DRAWING

    function DisplayUpdate(cm, viewport, force) {
        var display = cm.display;

        this.viewport        = viewport;
        // Store some values that we'll need later (but don't want to force a relayout
        // for)
        this.visible         = visibleLines(display, cm.doc, viewport);
        this.editorIsHidden  = !display.wrapper.offsetWidth;
        this.wrapperHeight   = display.wrapper.clientHeight;
        this.wrapperWidth    = display.wrapper.clientWidth;
        this.oldDisplayWidth = displayWidth(cm);
        this.force           = force;
        this.dims            = getDimensions(cm);
    }

    function maybeClipScrollbars(cm) {
        var display = cm.display;
        if (!display.scrollbarsClipped && display.scroller.offsetWidth) {
            display.nativeBarWidth               = display.scroller.offsetWidth - display.scroller.clientWidth;
            display.heightForcer.style.height    = scrollGap(cm) + "px";
            display.sizer.style.marginBottom     = -display.nativeBarWidth + "px";
            display.sizer.style.borderRightWidth = scrollGap(cm) + "px";
            display.scrollbarsClipped            = true;
        }
    }

    // Does the actual updating of the line display. Bails out (returning false)
    // when there is nothing to be done and forced is false.
    function updateDisplayIfNeeded(cm, update) {
        var display = cm.display,
            doc     = cm.doc;

        if (update.editorIsHidden) {
            resetView(cm);
            return false;
        }

        // Bail out if the visible area is already rendered and nothing changed.
        if (!update.force && update.visible.from >= display.viewFrom && update.visible.to <= display.viewTo && (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo) && display.renderedView == display.view && countDirtyView(cm) == 0) {
            return false;
        }

        if (maybeUpdateLineNumberWidth(cm)) {
            resetView(cm);
            update.dims = getDimensions(cm);
        }

        // Compute a suitable new viewport (from & to)
        var end = doc.first + doc.size;
        var from = Math.max(update.visible.from - cm.options.viewportMargin, doc.first);
        var to = Math.min(end, update.visible.to + cm.options.viewportMargin);
        if (display.viewFrom < from && from - display.viewFrom < 20) {
            from = Math.max(doc.first, display.viewFrom);
        }
        if (display.viewTo > to && display.viewTo - to < 20) {
            to = Math.min(end, display.viewTo);
        }
        if (sawCollapsedSpans) {
            from = visualLineNo(cm.doc, from);
            to   = visualLineEndNo(cm.doc, to);
        }

        var different = from != display.viewFrom || to != display.viewTo || display.lastWrapHeight != update.wrapperHeight || display.lastWrapWidth != update.wrapperWidth;
        adjustView(cm, from, to);

        display.viewOffset         = heightAtLine(getLine(cm.doc, display.viewFrom));
        // Position the mover div to align with the current scroll position
        cm.display.mover.style.top = display.viewOffset + "px";

        var toUpdate = countDirtyView(cm);
        if (!different && toUpdate == 0 && !update.force && display.renderedView == display.view && (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo)) {
            return false;
        }

        // For big changes, we hide the enclosing element during the update, since that
        // speeds up the operations on most browsers.
        var focused = activeElt();
        if (toUpdate > 4) {
            display.lineDiv.style.display = "none";
        }
        patchDisplay(cm, display.updateLineNumbers, update.dims);
        if (toUpdate > 4) {
            display.lineDiv.style.display = "";
        }
        display.renderedView = display.view;
        // There might have been a widget with a focused element that got hidden or
        // updated, if so re-focus it.
        if (focused && activeElt() != focused && focused.offsetHeight) {
            focused.focus();
        }

        // Prevent selection and cursors from interfering with the scroll width and
        // height.
        removeChildren(display.cursorDiv);
        removeChildren(display.selectionDiv);
        display.gutters.style.height = 0;

        if (different) {
            display.lastWrapHeight = update.wrapperHeight;
            display.lastWrapWidth  = update.wrapperWidth;
            startWorker(cm, 400);
        }

        display.updateLineNumbers = null;

        return true;
    }

    function postUpdateDisplay(cm, update) {
        var force    = update.force,
            viewport = update.viewport;
        for (var first = true;; first = false) {
            if (first && cm.options.lineWrapping && update.oldDisplayWidth != displayWidth(cm)) {
                force = true;
            } else {
                force = false;
                // Clip forced viewport to actual scrollable area.
                if (viewport && viewport.top != null) {
                    viewport = {
                        top: Math.min(cm.doc.height + paddingVert(cm.display) - displayHeight(cm), viewport.top)
                    };
                }
                // Updated line heights might result in the drawn area not actually covering the
                // viewport. Keep looping until it does.
                update.visible = visibleLines(cm.display, cm.doc, viewport);
                if (update.visible.from >= cm.display.viewFrom && update.visible.to <= cm.display.viewTo) {
                    break;
                }
            }
            if (!updateDisplayIfNeeded(cm, update)) {
                break;
            }
            updateHeightsInViewport(cm);
            var barMeasure = measureForScrollbars(cm);
            updateSelection(cm);
            setDocumentHeight(cm, barMeasure);
            updateScrollbars(cm, barMeasure);
        }

        signalLater(cm, "update", cm);
        if (cm.display.viewFrom != cm.display.reportedViewFrom || cm.display.viewTo != cm.display.reportedViewTo) {
            signalLater(cm, "viewportChange", cm, cm.display.viewFrom, cm.display.viewTo);
            cm.display.reportedViewFrom = cm.display.viewFrom;
            cm.display.reportedViewTo   = cm.display.viewTo;
        }
    }

    function updateDisplaySimple(cm, viewport) {
        var update = new DisplayUpdate(cm, viewport);
        if (updateDisplayIfNeeded(cm, update)) {
            updateHeightsInViewport(cm);
            postUpdateDisplay(cm, update);
            var barMeasure = measureForScrollbars(cm);
            updateSelection(cm);
            setDocumentHeight(cm, barMeasure);
            updateScrollbars(cm, barMeasure);
        }
    }

    function setDocumentHeight(cm, measure) {
        cm.display.sizer.style.minHeight = measure.docHeight + "px";
        var total = measure.docHeight + cm.display.barHeight;
        cm.display.heightForcer.style.top = total + "px";
        cm.display.gutters.style.height   = Math.max(total + scrollGap(cm), measure.clientHeight) + "px";
    }

    // Read the actual heights of the rendered lines, and update their stored
    // heights to match.
    function updateHeightsInViewport(cm) {
        var display = cm.display;
        var prevBottom = display.lineDiv.offsetTop;
        for (var i = 0; i < display.view.length; i += 1) {
            var cur = display.view[i],
                height;
            if (cur.hidden) {
                continue;
            }
            if (ie && ie_version < 8) {
                var bot = cur.node.offsetTop + cur.node.offsetHeight;
                height     = bot - prevBottom;
                prevBottom = bot;
            } else {
                var box = cur
                    .node
                    .getBoundingClientRect();
                height = box.bottom - box.top;
            }
            var diff = cur.line.height - height;
            if (height < 2) {
                height = textHeight(display);
            }
            if (diff > .001 || diff < -.001) {
                updateLineHeight(cur.line, height);
                updateWidgetHeight(cur.line);
                if (cur.rest) {
                    for (var j = 0; j < cur.rest.length; j += 1) {
                        updateWidgetHeight(cur.rest[j]);
                    }
                }
            }
        }
    }

    // Read and store the height of line widgets associated with the given line.
    function updateWidgetHeight(line) {
        if (line.widgets) {
            for (var i = 0; i < line.widgets.length; i += 1) {
                line
                    .widgets[i]
                    .height = line
                    .widgets[i]
                    .node
                    .offsetHeight;
            }
        }
    }

    // Do a bulk-read of the DOM positions and sizes needed to draw the view, so
    // that we don't interleave reading and writing to the DOM.
    function getDimensions(cm) {
        var d     = cm.display,
            left  = {},
            width = {};
        var gutterLeft = d.gutters.clientLeft;
        for (var n = d.gutters.firstChild, i = 0; n; n = n.nextSibling, i += 1) {
            left[
                cm
                    .options
                    .gutters[i]
            ] = n.offsetLeft + n.clientLeft + gutterLeft;
            width[
                cm
                    .options
                    .gutters[i]
            ] = n.clientWidth;
        }
        return {fixedPos: compensateForHScroll(d), gutterLeft: left, gutterTotalWidth: d.gutters.offsetWidth, gutterWidth: width, wrapperWidth: d.wrapper.clientWidth};
    }

    // Sync the actual display DOM structure with display.view, removing nodes for
    // lines that are no longer in view, and creating the ones that are not there
    // yet, and updating the ones that are out of date.
    function patchDisplay(cm, updateNumbersFrom, dims) {
        var display     = cm.display,
            lineNumbers = cm.options.lineNumbers;
        var container = display.lineDiv,
            cur       = container.firstChild;

        function rm(node) {
            var next = node.nextSibling;
            // Works around a throw-scroll bug in OS X Webkit
            if (webkit && mac && cm.display.currentWheelTarget == node) {
                node.style.display = "none";
            } else {
                node
                    .parentNode
                    .removeChild(node);
            }
            return next;
        }

        var view  = display.view,
            lineN = display.viewFrom;
        // Loop over the elements in the view, syncing cur (the DOM nodes in
        // display.lineDiv) with the view as we go.
        for (var i = 0; i < view.length; i += 1) {
            var lineView = view[i];
            if (lineView.hidden) {} else if (!lineView.node) { // Not drawn yet
                var node = buildLineElement(cm, lineView, lineN, dims);
                container.insertBefore(node, cur);
            } else { // Already drawn
                while (cur != lineView.node) {
                    cur = rm(cur);
                }
                var updateNumber = lineNumbers && updateNumbersFrom != null && updateNumbersFrom <= lineN && lineView.lineNumber;
                if (lineView.changes) {
                    if (indexOf(lineView.changes, "gutter") > -1) {
                        updateNumber = false;
                    }
                    updateLineForChanges(cm, lineView, lineN, dims);
                }
                if (updateNumber) {
                    removeChildren(lineView.lineNumber);
                    lineView
                        .lineNumber
                        .appendChild(document.createTextNode(lineNumberFor(cm.options, lineN)));
                }
                cur = lineView.node.nextSibling;
            }
            lineN += lineView.size;
        }
        while (cur) {
            cur = rm(cur);
        }
    }

    // When an aspect of a line changes, a string is added to lineView.changes. This
    // updates the relevant part of the line's DOM structure.
    function updateLineForChanges(cm, lineView, lineN, dims) {
        for (var j = 0; j < lineView.changes.length; j += 1) {
            var type = lineView.changes[j];
            if (type == "text") {
                updateLineText(cm, lineView);
            } else if (type == "gutter") {
                updateLineGutter(cm, lineView, lineN, dims);
            } else if (type == "class") {
                updateLineClasses(lineView);
            } else if (type == "widget") {
                updateLineWidgets(lineView, dims);
            }
        }
        lineView.changes = null;
    }

    // Lines with gutter elements, widgets or a background class need to be wrapped,
    // and have the extra elements added to the wrapper div
    function ensureLineWrapped(lineView) {
        if (lineView.node == lineView.text) {
            lineView.node = elt("div", null, null, "position: relative");
            if (lineView.text.parentNode) {
                lineView
                    .text
                    .parentNode
                    .replaceChild(lineView.node, lineView.text);
            }
            lineView
                .node
                .appendChild(lineView.text);
            if (ie && ie_version < 8) {
                lineView.node.style.zIndex = 2;
            }
        }
        return lineView.node;
    }

    function updateLineBackground(lineView) {
        var cls = lineView.bgClass
            ? lineView.bgClass + " " + (lineView.line.bgClass || "")
            : lineView.line.bgClass;
        if (cls) {
            cls += " CodeMirror-linebackground";
        }
        if (lineView.background) {
            if (cls) {
                lineView.background.className = cls;
            } else {
                lineView
                    .background
                    .parentNode
                    .removeChild(lineView.background);
                lineView.background = null;
            }
        } else if (cls) {
            var wrap = ensureLineWrapped(lineView);
            lineView.background = wrap.insertBefore(elt("div", null, cls), wrap.firstChild);
        }
    }

    // Wrapper around buildLineContent which will reuse the structure in
    // display.externalMeasured when possible.
    function getLineContent(cm, lineView) {
        var ext = cm.display.externalMeasured;
        if (ext && ext.line == lineView.line) {
            cm.display.externalMeasured = null;
            lineView.measure            = ext.measure;
            return ext.built;
        }
        return buildLineContent(cm, lineView);
    }

    // Redraw the line's text. Interacts with the background and text classes
    // because the mode may output tokens that influence these classes.
    function updateLineText(cm, lineView) {
        var cls = lineView.text.className;
        var built = getLineContent(cm, lineView);
        if (lineView.text == lineView.node) {
            lineView.node = built.pre;
        }
        lineView
            .text
            .parentNode
            .replaceChild(built.pre, lineView.text);
        lineView.text = built.pre;
        if (built.bgClass != lineView.bgClass || built.textClass != lineView.textClass) {
            lineView.bgClass   = built.bgClass;
            lineView.textClass = built.textClass;
            updateLineClasses(lineView);
        } else if (cls) {
            lineView.text.className = cls;
        }
    }

    function updateLineClasses(lineView) {
        updateLineBackground(lineView);
        if (lineView.line.wrapClass) {
            ensureLineWrapped(lineView).className = lineView.line.wrapClass;
        } else if (lineView.node != lineView.text) {
            lineView.node.className = "";
        }
        var textClass = lineView.textClass
            ? lineView.textClass + " " + (lineView.line.textClass || "")
            : lineView.line.textClass;
        lineView.text.className = textClass || "";
    }

    function updateLineGutter(cm, lineView, lineN, dims) {
        if (lineView.gutter) {
            lineView
                .node
                .removeChild(lineView.gutter);
            lineView.gutter = null;
        }
        var markers = lineView.line.gutterMarkers;
        if (cm.options.lineNumbers || markers) {
            var wrap = ensureLineWrapped(lineView);
            var gutterWrap = lineView.gutter = wrap.insertBefore(elt("div", null, "CodeMirror-gutter-wrapper", "left: " +
                    (cm.options.fixedGutter
                ? dims.fixedPos
                : -dims.gutterTotalWidth) + "px; width: " + dims.gutterTotalWidth + "px"), lineView.text);
            if (lineView.line.gutterClass) {
                gutterWrap.className += " " + lineView.line.gutterClass;
            }
            if (cm.options.lineNumbers && (!markers || !markers["CodeMirror-linenumbers"])) {
                lineView.lineNumber = gutterWrap.appendChild(elt("div", lineNumberFor(cm.options, lineN), "CodeMirror-linenumber CodeMirror-gutter-elt", "left: " +
                        dims.gutterLeft["CodeMirror-linenumbers"] + "px; width: " + cm.display.lineNumInnerWidth +
                        "px"));
            }
            if (markers) {
                for (var k = 0; k < cm.options.gutters.length; k += 1) {
                    var id    = cm
                            .options
                            .gutters[k],
                        found = markers.hasOwnProperty(id) && markers[id];
                    if (found) {
                        gutterWrap.appendChild(elt("div", [found], "CodeMirror-gutter-elt", "left: " +
                                dims.gutterLeft[id] + "px; width: " + dims.gutterWidth[id] + "px"));
                    }
                }
            }
        }
    }

    function updateLineWidgets(lineView, dims) {
        if (lineView.alignable) {
            lineView.alignable = null;
        }
        for (var node = lineView.node.firstChild, next; node; node = next) {
            var next = node.nextSibling;
            if (node.className == "CodeMirror-linewidget") {
                lineView
                    .node
                    .removeChild(node);
            }
        }
        insertLineWidgets(lineView, dims);
    }

    // Build a line's DOM representation from scratch
    function buildLineElement(cm, lineView, lineN, dims) {
        var built = getLineContent(cm, lineView);
        lineView.text = lineView.node = built.pre;
        if (built.bgClass) {
            lineView.bgClass = built.bgClass;
        }
        if (built.textClass) {
            lineView.textClass = built.textClass;
        }

        updateLineClasses(lineView);
        updateLineGutter(cm, lineView, lineN, dims);
        insertLineWidgets(lineView, dims);
        return lineView.node;
    }

    // A lineView may contain multiple logical lines (when merged by collapsed
    // spans). The widgets for all of them need to be drawn.
    function insertLineWidgets(lineView, dims) {
        insertLineWidgetsFor(lineView.line, lineView, dims, true);
        if (lineView.rest) {
            for (var i = 0; i < lineView.rest.length; i += 1) {
                insertLineWidgetsFor(lineView.rest[i], lineView, dims, false);
            }
        }
    }

    function insertLineWidgetsFor(line, lineView, dims, allowAbove) {
        if (!line.widgets) {
            return;
        }
        var wrap = ensureLineWrapped(lineView);
        for (var i = 0, ws = line.widgets; i < ws.length; i += 1) {
            var widget = ws[i],
                node   = elt("div", [widget.node], "CodeMirror-linewidget");
            if (!widget.handleMouseEvents) {
                node.setAttribute("cm-ignore-events", "true");
            }
            positionLineWidget(widget, node, lineView, dims);
            if (allowAbove && widget.above) {
                wrap.insertBefore(node, lineView.gutter || lineView.text);
            } else {
                wrap.appendChild(node);
            }
            signalLater(widget, "redraw");
        }
    }

    function positionLineWidget(widget, node, lineView, dims) {
        if (widget.noHScroll) {
            (lineView.alignable || (lineView.alignable = [])).push(node);
            var width = dims.wrapperWidth;
            node.style.left = dims.fixedPos + "px";
            if (!widget.coverGutter) {
                width                  -= dims.gutterTotalWidth;
                node.style.paddingLeft = dims.gutterTotalWidth + "px";
            }
            node.style.width = width + "px";
        }
        if (widget.coverGutter) {
            node.style.zIndex   = 5;
            node.style.position = "relative";
            if (!widget.noHScroll) {
                node.style.marginLeft = -dims.gutterTotalWidth + "px";
            }
        }
    }

    // POSITION OBJECT A Pos instance represents a position within the text.
    var Pos = codeMirror.Pos = function (line, ch) {
        if (!(this instanceof Pos)) {
            return new Pos(line, ch);
        }
        this.line = line;
        this.ch   = ch;
    };

    // Compare two positions, return 0 if they are the same, a negative number when
    // a is less, and a positive number otherwise.
    var cmp = codeMirror.cmpPos = function (a, b) {
        return a.line - b.line || a.ch - b.ch;
    };

    function copyPos(x) {
        return Pos(x.line, x.ch);
    }
    function maxPos(a, b) {
        return cmp(a, b) < 0
            ? b
            : a;
    }
    function minPos(a, b) {
        return cmp(a, b) < 0
            ? a
            : b;
    }

    // SELECTION / CURSOR Selection objects are immutable. A new one is created
    // every time the selection changes. A selection is one or more non-overlapping
    // (and non-touching) ranges, sorted, and an integer that indicates which one is
    // the primary selection (the one that's scrolled into view, that getCursor
    // returns, etc).
    function Selection(ranges, primIndex) {
        this.ranges    = ranges;
        this.primIndex = primIndex;
    }

    Selection.prototype = {
        contains         : function (pos, end) {
            if (!end) {
                end = pos;
            }
            for (var i = 0; i < this.ranges.length; i += 1) {
                var range = this.ranges[i];
                if (cmp(end, range.from()) >= 0 && cmp(pos, range.to()) <= 0) {
                    return i;
                }
            }
            return -1;
        },
        deepCopy         : function () {
            for (var out = [], i = 0; i < this.ranges.length; i += 1) {
                out[i] = new Range(copyPos(this.ranges[i].anchor), copyPos(this.ranges[i].head));
            }
            return new Selection(out, this.primIndex);
        },
        equals           : function (other) {
            if (other == this) {
                return true;
            }
            if (other.primIndex != this.primIndex || other.ranges.length != this.ranges.length) {
                return false;
            }
            for (var i = 0; i < this.ranges.length; i += 1) {
                var here  = this.ranges[i],
                    there = other.ranges[i];
                if (cmp(here.anchor, there.anchor) != 0 || cmp(here.head, there.head) != 0) {
                    return false;
                }
            }
            return true;
        },
        primary          : function () {
            return this.ranges[this.primIndex];
        },
        somethingSelected: function () {
            for (var i = 0; i < this.ranges.length; i += 1) {
                if (!this.ranges[i].empty()) {
                    return true;
                }
            }
            return false;
        }
    };

    function Range(anchor, head) {
        this.anchor = anchor;
        this.head   = head;
    }

    Range.prototype = {
        empty: function () {
            return this.head.line == this.anchor.line && this.head.ch == this.anchor.ch;
        },
        from : function () {
            return minPos(this.anchor, this.head);
        },
        to   : function () {
            return maxPos(this.anchor, this.head);
        }
    };

    // Take an unsorted, potentially overlapping set of ranges, and build a
    // selection out of it. 'Consumes' ranges array (modifying it).
    function normalizeSelection(ranges, primIndex) {
        var prim = ranges[primIndex];
        ranges.sort(function (a, b) {
            return cmp(a.from(), b.from());
        });
        primIndex = indexOf(ranges, prim);
        for (var i = 1; i < ranges.length; i += 1) {
            var cur  = ranges[i],
                prev = ranges[i - 1];
            if (cmp(prev.to(), cur.from()) >= 0) {
                var from = minPos(prev.from(), cur.from()),
                    to   = maxPos(prev.to(), cur.to());
                var inv = prev.empty()
                    ? cur.from() == cur.head
                    : prev.from() == prev.head;
                if (i <= primIndex) {
                    --primIndex;
                }
                ranges.splice(i -= 1, 2, new Range(inv
                    ? to
                    : from,
                inv
                    ? from
                    : to));
            }
        }
        return new Selection(ranges, primIndex);
    }

    function simpleSelection(anchor, head) {
        return new Selection([new Range(anchor, head || anchor)], 0);
    }

    // Most of the external API clips given positions to make sure they actually
    // exist within the document.
    function clipLine(doc, n) {
        return Math.max(doc.first, Math.min(n, doc.first + doc.size - 1));
    }
    function clipPos(doc, pos) {
        if (pos.line < doc.first) {
            return Pos(doc.first, 0);
        }
        var last = doc.first + doc.size - 1;
        if (pos.line > last) {
            return Pos(last, getLine(doc, last).text.length);
        }
        return clipToLen(pos, getLine(doc, pos.line).text.length);
    }
    function clipToLen(pos, linelen) {
        var ch = pos.ch;
        if (ch == null || ch > linelen) {
            return Pos(pos.line, linelen);
        } else if (ch < 0) {
            return Pos(pos.line, 0);
        } else {
            return pos;
        }
    }
    function isLine(doc, l) {
        return l >= doc.first && l < doc.first + doc.size;
    }
    function clipPosArray(doc, array) {
        for (var out = [], i = 0; i < array.length; i += 1) {
            out[i] = clipPos(doc, array[i]);
        }
        return out;
    }

    // SELECTION UPDATES The 'scroll' parameter given to many of these indicated
    // whether the new cursor position should be scrolled into view after modifying
    // the selection. If shift is held or the extend flag is set, extends a range to
    // include a given position (and optionally a second position). Otherwise,
    // simply returns the range between the given positions. Used for cursor motion
    // and such.
    function extendRange(doc, range, head, other) {
        if (doc.cm && doc.cm.display.shift || doc.extend) {
            var anchor = range.anchor;
            if (other) {
                var posBefore = cmp(head, anchor) < 0;
                if (posBefore != (cmp(other, anchor) < 0)) {
                    anchor = head;
                    head   = other;
                } else if (posBefore != (cmp(head, other) < 0)) {
                    head = other;
                }
            }
            return new Range(anchor, head);
        } else {
            return new Range(other || head, head);
        }
    }

    // Extend the primary selection range, discard the rest.
    function extendSelection(doc, head, other, options) {
        setSelection(doc, new Selection([extendRange(doc, doc.sel.primary(), head, other)], 0), options);
    }

    // Extend all selections (pos is an array of selections with length equal the
    // number of selections)
    function extendSelections(doc, heads, options) {
        for (var out = [], i = 0; i < doc.sel.ranges.length; i += 1) {
            out[i] = extendRange(doc, doc.sel.ranges[i], heads[i], null);
        }
        var newSel = normalizeSelection(out, doc.sel.primIndex);
        setSelection(doc, newSel, options);
    }

    // Updates a single range in the selection.
    function replaceOneSelection(doc, i, range, options) {
        var ranges = doc
            .sel
            .ranges
            .slice(0);
        ranges[i] = range;
        setSelection(doc, normalizeSelection(ranges, doc.sel.primIndex), options);
    }

    // Reset the selection to a single range.
    function setSimpleSelection(doc, anchor, head, options) {
        setSelection(doc, simpleSelection(anchor, head), options);
    }

    // Give beforeSelectionChange handlers a change to influence a selection update.
    function filterSelectionChange(doc, sel) {
        var obj = {
            ranges: sel.ranges,
            update: function (ranges) {
                this.ranges = [];
                for (var i = 0; i < ranges.length; i += 1) {
                    this.ranges[i] = new Range(clipPos(doc, ranges[i].anchor), clipPos(doc, ranges[i].head));
                }
            }
        };
        signal(doc, "beforeSelectionChange", doc, obj);
        if (doc.cm) {
            signal(doc.cm, "beforeSelectionChange", doc.cm, obj);
        }
        if (obj.ranges != sel.ranges) {
            return normalizeSelection(obj.ranges, obj.ranges.length - 1);
        } else {
            return sel;
        }
    }

    function setSelectionReplaceHistory(doc, sel, options) {
        var done = doc.history.done,
            last = lst(done);
        if (last && last.ranges) {
            done[done.length - 1] = sel;
            setSelectionNoUndo(doc, sel, options);
        } else {
            setSelection(doc, sel, options);
        }
    }

    // Set a new selection.
    function setSelection(doc, sel, options) {
        setSelectionNoUndo(doc, sel, options);
        addSelectionToHistory(doc, doc.sel, doc.cm
            ? doc.cm.curOp.id
            : NaN,
        options);
    }

    function setSelectionNoUndo(doc, sel, options) {
        if (hasHandler(doc, "beforeSelectionChange") || doc.cm && hasHandler(doc.cm, "beforeSelectionChange")) {
            sel = filterSelectionChange(doc, sel);
        }

        var bias = options && options.bias || (typeof sel.primary === "function" && cmp(sel.primary().head, doc.sel.primary().head) < 0
            ? -1
            : 1);
        setSelectionInner(doc, skipAtomicInSelection(doc, sel, bias, true));

        if (!(options && options.scroll === false) && doc.cm) {
            ensureCursorVisible(doc.cm);
        }
    }

    function setSelectionInner(doc, sel) {
        if (sel.equals(doc.sel)) {
            return;
        }

        doc.sel = sel;

        if (doc.cm) {
            doc.cm.curOp.updateInput = doc.cm.curOp.selectionChanged = true;
            signalCursorActivity(doc.cm);
        }
        signalLater(doc, "cursorActivity", doc);
    }

    // Verify that the selection does not partially select any atomic marked ranges.
    function reCheckSelection(doc) {
        setSelectionInner(doc, skipAtomicInSelection(doc, doc.sel, null, false), sel_dontScroll);
    }

    // Return a selection that does not partially select any atomic ranges.
    function skipAtomicInSelection(doc, sel, bias, mayClear) {
        var out;
        for (var i = 0; i < sel.ranges.length; i += 1) {
            var range = sel.ranges[i];
            var newAnchor = skipAtomic(doc, range.anchor, bias, mayClear);
            var newHead = skipAtomic(doc, range.head, bias, mayClear);
            if (out || newAnchor != range.anchor || newHead != range.head) {
                if (!out) {
                    out = sel
                        .ranges
                        .slice(0, i);
                }
                out[i] = new Range(newAnchor, newHead);
            }
        }
        return out
            ? normalizeSelection(out, sel.primIndex)
            : sel;
    }

    // Ensure a given position is not inside an atomic range.
    function skipAtomic(doc, pos, bias, mayClear) {
        var flipped = false,
            curPos  = pos;
        var dir = bias || 1;
        doc.cantEdit = false;
        search : for (;;) {
            var line = getLine(doc, curPos.line);
            if (line.markedSpans) {
                for (var i = 0; i < line.markedSpans.length; i += 1) {
                    var sp = line.markedSpans[i],
                        m  = sp.marker;
                    if ((sp.from == null || (m.inclusiveLeft
                        ? sp.from <= curPos.ch
                        : sp.from < curPos.ch)) && (sp.to == null || (m.inclusiveRight
                        ? sp.to >= curPos.ch
                        : sp.to > curPos.ch))) {
                        if (mayClear) {
                            signal(m, "beforeCursorEnter");
                            if (m.explicitlyCleared) {
                                if (!line.markedSpans) {
                                    break;
                                } else {
                                    i -= 1;
                                    continue;
                                }
                            }
                        }
                        if (!m.atomic) {
                            continue;
                        }
                        var newPos = m.find(dir < 0
                            ? -1
                            : 1);
                        if (cmp(newPos, curPos) == 0) {
                            newPos.ch += dir;
                            if (newPos.ch < 0) {
                                if (newPos.line > doc.first) {
                                    newPos = clipPos(doc, Pos(newPos.line - 1));
                                } else {
                                    newPos = null;
                                }
                            } else if (newPos.ch > line.text.length) {
                                if (newPos.line < doc.first + doc.size - 1) {
                                    newPos = Pos(newPos.line + 1, 0);
                                } else {
                                    newPos = null;
                                }
                            }
                            if (!newPos) {
                                if (flipped) {
                                    // Driven in a corner -- no valid cursor position found at all -- try again
                                    // *with* clearing, if we didn't already
                                    if (!mayClear) {
                                        return skipAtomic(doc, pos, bias, true);
                                    }
                                    // Otherwise, turn off editing until further notice, and return the start of the
                                    // doc
                                    doc.cantEdit = true;
                                    return Pos(doc.first, 0);
                                }
                                flipped = true;
                                newPos  = pos;
                                dir     = -dir;
                            }
                        }
                        curPos = newPos;
                        continue search;
                    }
                }
            }
            return curPos;
        };
    }

    // SELECTION DRAWING Redraw the selection and/or cursor
    function drawSelection(cm) {
        var display = cm.display,
            doc     = cm.doc,
            result  = {};
        var curFragment = result.cursors = document.createDocumentFragment();
        var selFragment = result.selection = document.createDocumentFragment();

        for (var i = 0; i < doc.sel.ranges.length; i += 1) {
            var range = doc
                .sel
                .ranges[i];
            var collapsed = range.empty();
            if (collapsed || cm.options.showCursorWhenSelecting) {
                drawSelectionCursor(cm, range, curFragment);
            }
            if (!collapsed) {
                drawSelectionRange(cm, range, selFragment);
            }
        }

        // Move the hidden textarea near the cursor to prevent scrolling artifacts
        if (cm.options.moveInputWithCursor) {
            var headPos = cursorCoords(cm, doc.sel.primary().head, "div");
            var wrapOff = display
                    .wrapper
                    .getBoundingClientRect(),
                lineOff = display
                    .lineDiv
                    .getBoundingClientRect();
            result.teTop  = Math.max(0, Math.min(display.wrapper.clientHeight - 10, headPos.top + lineOff.top - wrapOff.top));
            result.teLeft = Math.max(0, Math.min(display.wrapper.clientWidth - 10, headPos.left + lineOff.left - wrapOff.left));
        }

        return result;
    }

    function showSelection(cm, drawn) {
        removeChildrenAndAdd(cm.display.cursorDiv, drawn.cursors);
        removeChildrenAndAdd(cm.display.selectionDiv, drawn.selection);
        if (drawn.teTop != null) {
            cm.display.inputDiv.style.top  = drawn.teTop + "px";
            cm.display.inputDiv.style.left = drawn.teLeft + "px";
        }
    }

    function updateSelection(cm) {
        showSelection(cm, drawSelection(cm));
    }

    // Draws a cursor for the given range
    function drawSelectionCursor(cm, range, output) {
        var pos = cursorCoords(cm, range.head, "div", null, null, !cm.options.singleCursorHeightPerLine);

        var cursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor"));
        cursor.style.left   = pos.left + "px";
        cursor.style.top    = pos.top + "px";
        cursor.style.height = Math.max(0, pos.bottom - pos.top) * cm.options.cursorHeight + "px";

        if (pos.other) {
            // Secondary cursor, shown when on a 'jump' in bi-directional text
            var otherCursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor CodeMirror-secondarycursor"));
            otherCursor.style.display = "";
            otherCursor.style.left    = pos.other.left + "px";
            otherCursor.style.top     = pos.other.top + "px";
            otherCursor.style.height  = (pos.other.bottom - pos.other.top) * .85 + "px";
        }
    }

    // Draws the given range as a highlighted selection
    function drawSelectionRange(cm, range, output) {
        var display = cm.display,
            doc     = cm.doc;
        var fragment = document.createDocumentFragment();
        var padding  = paddingH(cm.display),
            leftSide = padding.left;
        var rightSide = Math.max(display.sizerWidth, displayWidth(cm) - display.sizer.offsetLeft) - padding.right;

        function add(left, top, width, bottom) {
            if (top < 0) {
                top = 0;
            }
            top    = Math.round(top);
            bottom = Math.round(bottom);
            fragment.appendChild(elt("div", null, "CodeMirror-selected", "position: absolute; left: " +
                    left + "px; top: " + top + "px; width: " + (width == null
                ? rightSide - left
                : width) + "px; height: " + (bottom - top) + "px"));
        }

        function drawForLine(line, fromArg, toArg) {
            var lineObj = getLine(doc, line);
            var lineLen = lineObj.text.length;
            var start,
                end;
            function coords(ch, bias) {
                return charCoords(cm, Pos(line, ch), "div", lineObj, bias);
            }

            iterateBidiSections(getOrder(lineObj), fromArg || 0, toArg == null
                ? lineLen
                : toArg,
            function (from, to, dir) {
                var leftPos = coords(from, "left"),
                    rightPos,
                    left,
                    right;
                if (from == to) {
                    rightPos = leftPos;
                    left     = right = leftPos.left;
                } else {
                    rightPos = coords(to - 1, "right");
                    if (dir == "rtl") {
                        var tmp = leftPos;
                        leftPos  = rightPos;
                        rightPos = tmp;
                    }
                    left  = leftPos.left;
                    right = rightPos.right;
                }
                if (fromArg == null && from == 0) {
                    left = leftSide;
                }
                if (rightPos.top - leftPos.top > 3) { // Different lines, draw top part
                    add(left, leftPos.top, null, leftPos.bottom);
                    left = leftSide;
                    if (leftPos.bottom < rightPos.top) {
                        add(left, leftPos.bottom, null, rightPos.top);
                    }
                }
                if (toArg == null && to == lineLen) {
                    right = rightSide;
                }
                if (!start || leftPos.top < start.top || leftPos.top == start.top && leftPos.left < start.left) {
                    start = leftPos;
                }
                if (!end || rightPos.bottom > end.bottom || rightPos.bottom == end.bottom && rightPos.right > end.right) {
                    end = rightPos;
                }
                if (left < leftSide + 1) {
                    left = leftSide;
                }
                add(left, rightPos.top, right - left, rightPos.bottom);
            });
            return {end: end, start: start};
        }

        var sFrom = range.from(),
            sTo   = range.to();
        if (sFrom.line == sTo.line) {
            drawForLine(sFrom.line, sFrom.ch, sTo.ch);
        } else {
            var fromLine = getLine(doc, sFrom.line),
                toLine   = getLine(doc, sTo.line);
            var singleVLine = visualLine(fromLine) == visualLine(toLine);
            var leftEnd = drawForLine(sFrom.line, sFrom.ch, singleVLine
                ? fromLine.text.length + 1
                : null).end;
            var rightStart = drawForLine(sTo.line, singleVLine
                ? 0
                : null,
            sTo.ch).start;
            if (singleVLine) {
                if (leftEnd.top < rightStart.top - 2) {
                    add(leftEnd.right, leftEnd.top, null, leftEnd.bottom);
                    add(leftSide, rightStart.top, rightStart.left, rightStart.bottom);
                } else {
                    add(leftEnd.right, leftEnd.top, rightStart.left - leftEnd.right, leftEnd.bottom);
                }
            }
            if (leftEnd.bottom < rightStart.top) {
                add(leftSide, leftEnd.bottom, null, rightStart.top);
            }
        }

        output.appendChild(fragment);
    }

    // Cursor-blinking
    function restartBlink(cm) {
        if (!cm.state.focused) {
            return;
        }
        var display = cm.display;
        clearInterval(display.blinker);
        var on = true;
        display.cursorDiv.style.visibility = "";
        if (cm.options.cursorBlinkRate > 0) {
            display.blinker = setInterval(function () {
                display.cursorDiv.style.visibility = (on = !on)
                    ? ""
                    : "hidden";
            }, cm.options.cursorBlinkRate);
        } else if (cm.options.cursorBlinkRate < 0) {
            display.cursorDiv.style.visibility = "hidden";
        }
    }

    // HIGHLIGHT WORKER

    function startWorker(cm, time) {
        if (cm.doc.mode.startState && cm.doc.frontier < cm.display.viewTo) {
            cm
                .state
                .highlight
                .set(time, bind(highlightWorker, cm));
        }
    }

    function highlightWorker(cm) {
        var doc = cm.doc;
        if (doc.frontier < doc.first) {
            doc.frontier = doc.first;
        }
        if (doc.frontier >= cm.display.viewTo) {
            return;
        }
        var end = +new Date + cm.options.workTime;
        var state = copyState(doc.mode, getStateBefore(cm, doc.frontier));
        var changedLines = [];

        doc.iter(doc.frontier, Math.min(doc.first + doc.size, cm.display.viewTo + 500), function (line) {
            if (doc.frontier >= cm.display.viewFrom) { // Visible
                var oldStyles = line.styles;
                var highlighted = highlightLine(cm, line, state, true);
                line.styles = highlighted.styles;
                var oldCls = line.styleClasses,
                    newCls = highlighted.classes;
                if (newCls) {
                    line.styleClasses = newCls;
                } else if (oldCls) {
                    line.styleClasses = null;
                }
                var ischange = !oldStyles || oldStyles.length != line.styles.length || oldCls != newCls && (!oldCls || !newCls || oldCls.bgClass != newCls.bgClass || oldCls.textClass != newCls.textClass);
                for (var i = 0; !ischange && i < oldStyles.length; i += 1) {
                    ischange = oldStyles[i] != line.styles[i];
                }
                if (ischange) {
                    changedLines.push(doc.frontier);
                }
                line.stateAfter = copyState(doc.mode, state);
            } else {
                processLine(cm, line.text, state);
                line.stateAfter = doc.frontier % 5 == 0
                    ? copyState(doc.mode, state)
                    : null;
            }
            ++doc.frontier;
            if (+new Date > end) {
                startWorker(cm, cm.options.workDelay);
                return true;
            }
        });
        if (changedLines.length) {
            runInOp(cm, function () {
                for (var i = 0; i < changedLines.length; i += 1) {
                    regLineChange(cm, changedLines[i], "text");
                }
            });
        }
    }

    // Finds the line to start with when starting a parse. Tries to find a line with
    // a stateAfter, so that it can start with a valid state. If that fails, it
    // returns the line with the smallest indentation, which tends to need the least
    // context to parse correctly.
    function findStartLine(cm, n, precise) {
        var minindent,
            minline,
            doc = cm.doc;
        var lim = precise
            ? -1
            : n - (cm.doc.mode.innerMode
                ? 1000
                : 100);
        for (var search = n; search > lim; search -= 1) {
            if (search <= doc.first) {
                return doc.first;
            }
            var line = getLine(doc, search - 1);
            if (line.stateAfter && (!precise || search <= doc.frontier)) {
                return search;
            }
            var indented = countColumn(line.text, null, cm.options.tabSize);
            if (minline == null || minindent > indented) {
                minline   = search - 1;
                minindent = indented;
            }
        }
        return minline;
    }

    function getStateBefore(cm, n, precise) {
        var doc     = cm.doc,
            display = cm.display;
        if (!doc.mode.startState) {
            return true;
        }
        var pos   = findStartLine(cm, n, precise),
            state = pos > doc.first && getLine(doc, pos - 1).stateAfter;
        if (!state) {
            state = startState(doc.mode);
        } else {
            state = copyState(doc.mode, state);
        }
        doc.iter(pos, n, function (line) {
            processLine(cm, line.text, state);
            var save = pos == n - 1 || pos % 5 == 0 || pos >= display.viewFrom && pos < display.viewTo;
            line.stateAfter = save
                ? copyState(doc.mode, state)
                : null;
            pos             += 1;
        });
        if (precise) {
            doc.frontier = pos;
        }
        return state;
    }

    // POSITION MEASUREMENT

    function paddingTop(display) {
        return display.lineSpace.offsetTop;
    }
    function paddingVert(display) {
        return display.mover.offsetHeight - display.lineSpace.offsetHeight;
    }
    function paddingH(display) {
        if (display.cachedPaddingH) {
            return display.cachedPaddingH;
        }
        var e = removeChildrenAndAdd(display.measure, elt("pre", "x"));
        var style = window.getComputedStyle
            ? window.getComputedStyle(e)
            : e.currentStyle;
        var data = {
            left : parseInt(style.paddingLeft),
            right: parseInt(style.paddingRight)
        };
        if (!isNaN(data.left) && !isNaN(data.right)) {
            display.cachedPaddingH = data;
        }
        return data;
    }

    function scrollGap(cm) {
        return scrollerGap - cm.display.nativeBarWidth;
    }
    function displayWidth(cm) {
        return cm.display.scroller.clientWidth - scrollGap(cm) - cm.display.barWidth;
    }
    function displayHeight(cm) {
        return cm.display.scroller.clientHeight - scrollGap(cm) - cm.display.barHeight;
    }

    // Ensure the lineView.wrapping.heights array is populated. This is an array of
    // bottom offsets for the lines that make up a drawn line. When lineWrapping is
    // on, there might be more than one height.
    function ensureLineHeights(cm, lineView, rect) {
        var wrapping = cm.options.lineWrapping;
        var curWidth = wrapping && displayWidth(cm);
        if (!lineView.measure.heights || wrapping && lineView.measure.width != curWidth) {
            var heights = lineView.measure.heights = [];
            if (wrapping) {
                lineView.measure.width = curWidth;
                var rects = lineView
                    .text
                    .firstChild
                    .getClientRects();
                for (var i = 0; i < rects.length - 1; i += 1) {
                    var cur  = rects[i],
                        next = rects[i + 1];
                    if (Math.abs(cur.bottom - next.bottom) > 2) {
                        heights.push((cur.bottom + next.top) / 2 - rect.top);
                    }
                }
            }
            heights.push(rect.bottom - rect.top);
        }
    }

    // Find a line map (mapping character offsets to text nodes) and a measurement
    // cache for the given line number. (A line view might contain multiple lines
    // when collapsed ranges are present.)
    function mapFromLineView(lineView, line, lineN) {
        if (lineView.line == line) {
            return {cache: lineView.measure.cache, map: lineView.measure.map};
        }
        for (var i = 0; i < lineView.rest.length; i += 1) {
            if (lineView.rest[i] == line) {
                return {
                    cache: lineView
                        .measure
                        .caches[i],
                    map  : lineView
                        .measure
                        .maps[i]
                };
            }
        }
        for (var i = 0; i < lineView.rest.length; i += 1) {
            if (lineNo(lineView.rest[i]) > lineN) {
                return {
                    before: true,
                    cache : lineView
                        .measure
                        .caches[i],
                    map   : lineView
                        .measure
                        .maps[i]
                };
            }
        }
    }

    // Render a line into the hidden node display.externalMeasured. Used when
    // measurement is needed for a line that's not in the viewport.
    function updateExternalMeasurement(cm, line) {
        line = visualLine(line);
        var lineN = lineNo(line);
        var view = cm.display.externalMeasured = new LineView(cm.doc, line, lineN);
        view.lineN = lineN;
        var built = view.built = buildLineContent(cm, view);
        view.text = built.pre;
        removeChildrenAndAdd(cm.display.lineMeasure, built.pre);
        return view;
    }

    // Get a {top, bottom, left, right} box (in line-local coordinates) for a given
    // character.
    function measureChar(cm, line, ch, bias) {
        return measureCharPrepared(cm, prepareMeasureForLine(cm, line), ch, bias);
    }

    // Find a line view that corresponds to the given line number.
    function findViewForLine(cm, lineN) {
        if (lineN >= cm.display.viewFrom && lineN < cm.display.viewTo) {
            return cm
                .display
                .view[findViewIndex(cm, lineN)];
        }
        var ext = cm.display.externalMeasured;
        if (ext && lineN >= ext.lineN && lineN < ext.lineN + ext.size) {
            return ext;
        }
    }

    // Measurement can be split in two steps, the set-up work that applies to the
    // whole line, and the measurement of the actual character. Functions like
    // coordsChar, that need to do a lot of measurements in a row, can thus ensure
    // that the set-up work is only done once.
    function prepareMeasureForLine(cm, line) {
        var lineN = lineNo(line);
        var view = findViewForLine(cm, lineN);
        if (view && !view.text) {
            view = null;
        } else if (view && view.changes) {
            updateLineForChanges(cm, view, lineN, getDimensions(cm));
        }
        if (!view) {
            view = updateExternalMeasurement(cm, line);
        }

        var info = mapFromLineView(view, line, lineN);
        return {
            before    : info.before,
            cache     : info.cache,
            hasHeights: false,
            line      : line,
            map       : info.map,
            rect      : null,
            view      : view
        };
    }

    // Given a prepared measurement object, measures the position of an actual
    // character (or fetches it from the cache).
    function measureCharPrepared(cm, prepared, ch, bias, varHeight) {
        if (prepared.before) {
            ch = -1;
        }
        var key = ch + (bias || ""),
            found;
        if (prepared.cache.hasOwnProperty(key)) {
            found = prepared.cache[key];
        } else {
            if (!prepared.rect) {
                prepared.rect = prepared
                    .view
                    .text
                    .getBoundingClientRect();
            }
            if (!prepared.hasHeights) {
                ensureLineHeights(cm, prepared.view, prepared.rect);
                prepared.hasHeights = true;
            }
            found = measureCharInner(cm, prepared, ch, bias);
            if (!found.bogus) {
                prepared.cache[key] = found;
            }
        }
        return {
            bottom: varHeight
                ? found.rbottom
                : found.bottom,
            left  : found.left,
            right : found.right,
            top   : varHeight
                ? found.rtop
                : found.top
        };
    }

    var nullRect = {
        bottom: 0,
        left  : 0,
        right : 0,
        top   : 0
    };

    function measureCharInner(cm, prepared, ch, bias) {
        var map = prepared.map;

        var node,
            start,
            end,
            collapse;
        // First, search the line map for the text node corresponding to, or closest to,
        // the target character.
        for (var i = 0; i < map.length; i += 3) {
            var mStart = map[i],
                mEnd   = map[i + 1];
            if (ch < mStart) {
                start    = 0;
                end      = 1;
                collapse = "left";
            } else if (ch < mEnd) {
                start = ch - mStart;
                end   = start + 1;
            } else if (i == map.length - 3 || ch == mEnd && map[i + 3] > ch) {
                end   = mEnd - mStart;
                start = end - 1;
                if (ch >= mEnd) {
                    collapse = "right";
                }
            }
            if (start != null) {
                node = map[i + 2];
                if (mStart == mEnd && bias == (node.insertLeft
                    ? "left"
                    : "right")) {
                    collapse = bias;
                }
                if (bias == "left" && start == 0) {
                    while (i && map[i - 2] == map[i - 3] && map[i - 1].insertLeft) {
                        node     = map[(i -= 3) + 2];
                        collapse = "left";
                    }
                }
                if (bias == "right" && start == mEnd - mStart) {
                    while (i < map.length - 3 && map[i + 3] == map[i + 4] && !map[i + 5].insertLeft) {
                        node     = map[(i += 3) + 2];
                        collapse = "right";
                    }
                }
                break;
            }
        }

        var rect;
        if (node.nodeType == 3) { // If it is a text node, use a range to retrieve the coordinates.
            for (var i = 0; i < 4; i += 1) { // Retry a maximum of 4 times when nonsense rectangles are returned
                while (start && isExtendingChar(prepared.line.text.charAt(mStart + start))) {
                    --start;
                }
                while (mStart + end < mEnd && isExtendingChar(prepared.line.text.charAt(mStart +
                        end))) {
                    ++end;
                }
                if (ie && ie_version < 9 && start == 0 && end == mEnd - mStart) {
                    rect = node
                        .parentNode
                        .getBoundingClientRect();
                } else if (ie && cm.options.lineWrapping) {
                    var rects = range(node, start, end).getClientRects();
                    if (rects.length) {
                        rect = rects[
                            bias == "right"
                                ? rects.length - 1
                                : 0
                        ];
                    } else {
                        rect = nullRect;
                    }
                } else {
                    rect = range(node, start, end).getBoundingClientRect() || nullRect;
                }
                if (rect.left || rect.right || start == 0) {
                    break;
                }
                end      = start;
                start    = start - 1;
                collapse = "right";
            }
            if (ie && ie_version < 11) {
                rect = maybeUpdateRectForZooming(cm.display.measure, rect);
            }
        } else { // If it is a widget, simply get the box for the whole widget.
            if (start > 0) {
                collapse = bias = "right";
            }
            var rects;
            if (cm.options.lineWrapping && (rects = node.getClientRects()).length > 1) {
                rect = rects[
                    bias == "right"
                        ? rects.length - 1
                        : 0
                ];
            } else {
                rect = node.getBoundingClientRect();
            }
        }
        if (ie && ie_version < 9 && !start && (!rect || !rect.left && !rect.right)) {
            var rSpan = node
                .parentNode
                .getClientRects()[0];
            if (rSpan) {
                rect = {
                    bottom: rSpan.bottom,
                    left  : rSpan.left,
                    right : rSpan.left + charWidth(cm.display),
                    top   : rSpan.top
                };
            } else {
                rect = nullRect;
            }
        }

        var rtop = rect.top - prepared.rect.top,
            rbot = rect.bottom - prepared.rect.top;
        var mid = (rtop + rbot) / 2;
        var heights = prepared.view.measure.heights;
        for (var i = 0; i < heights.length - 1; i += 1) {
            if (mid < heights[i]) {
                break;
            }
        }
        var top = i
                ? heights[i - 1]
                : 0,
            bot = heights[i];
        var result = {
            bottom: bot,
            left  : (collapse == "right"
                ? rect.right
                : rect.left) - prepared.rect.left,
            right : (collapse == "left"
                ? rect.left
                : rect.right) - prepared.rect.left,
            top   : top
        };
        if (!rect.left && !rect.right) {
            result.bogus = true;
        }
        if (!cm.options.singleCursorHeightPerLine) {
            result.rtop    = rtop;
            result.rbottom = rbot;
        }

        return result;
    }

    // Work around problem with bounding client rects on ranges being returned
    // incorrectly when zoomed on IE10 and below.
    function maybeUpdateRectForZooming(measure, rect) {
        if (!window.screen || screen.logicalXDPI == null || screen.logicalXDPI == screen.deviceXDPI || !hasBadZoomedRects(measure)) {
            return rect;
        }
        var scaleX = screen.logicalXDPI / screen.deviceXDPI;
        var scaleY = screen.logicalYDPI / screen.deviceYDPI;
        return {
            bottom: rect.bottom * scaleY,
            left  : rect.left * scaleX,
            right : rect.right * scaleX,
            top   : rect.top * scaleY
        };
    }

    function clearLineMeasurementCacheFor(lineView) {
        if (lineView.measure) {
            lineView.measure.cache   = {};
            lineView.measure.heights = null;
            if (lineView.rest) {
                for (var i = 0; i < lineView.rest.length; i += 1) {
                    lineView
                        .measure
                        .caches[i] = {};
                }
            }
        }
    }

    function clearLineMeasurementCache(cm) {
        cm.display.externalMeasure = null;
        removeChildren(cm.display.lineMeasure);
        for (var i = 0; i < cm.display.view.length; i += 1) {
            clearLineMeasurementCacheFor(cm.display.view[i]);
        }
    }

    function clearCaches(cm) {
        clearLineMeasurementCache(cm);
        cm.display.cachedCharWidth = cm.display.cachedTextHeight = cm.display.cachedPaddingH = null;
        if (!cm.options.lineWrapping) {
            cm.display.maxLineChanged = true;
        }
        cm.display.lineNumChars = null;
    }

    function pageScrollX() {
        return window.pageXOffset || (document.documentElement || document.body).scrollLeft;
    }
    function pageScrollY() {
        return window.pageYOffset || (document.documentElement || document.body).scrollTop;
    }

    // Converts a {top, bottom, left, right} box from line-local coordinates into
    // another coordinate system. Context may be one of "line", "div"
    // (display.lineDiv), "local"/null (editor), "window", or "page".
    function intoCoordSystem(cm, lineObj, rect, context) {
        if (lineObj.widgets) {
            for (var i = 0; i < lineObj.widgets.length; i += 1) {
                if (lineObj.widgets[i].above) {
                    var size = widgetHeight(lineObj.widgets[i]);
                    rect.top    += size;
                    rect.bottom += size;
                }
            }
        }
        if (context == "line") {
            return rect;
        }
        if (!context) {
            context = "local";
        }
        var yOff = heightAtLine(lineObj);
        if (context == "local") {
            yOff += paddingTop(cm.display);
        } else {
            yOff -= cm.display.viewOffset;
        }
        if (context == "page" || context == "window") {
            var lOff = cm
                .display
                .lineSpace
                .getBoundingClientRect();
            yOff += lOff.top + (context == "window"
                ? 0
                : pageScrollY());
            var xOff = lOff.left + (context == "window"
                ? 0
                : pageScrollX());
            rect.left  += xOff;
            rect.right += xOff;
        }
        rect.top    += yOff;
        rect.bottom += yOff;
        return rect;
    }

    // Coverts a box from "div" coords to another coordinate system. Context may be
    // "window", "page", "div", or "local"/null.
    function fromCoordSystem(cm, coords, context) {
        if (context == "div") {
            return coords;
        }
        var left = coords.left,
            top  = coords.top;
        // First move into "page" coordinate system
        if (context == "page") {
            left -= pageScrollX();
            top  -= pageScrollY();
        } else if (context == "local" || !context) {
            var localBox = cm
                .display
                .sizer
                .getBoundingClientRect();
            left += localBox.left;
            top  += localBox.top;
        }

        var lineSpaceBox = cm
            .display
            .lineSpace
            .getBoundingClientRect();
        return {
            left: left - lineSpaceBox.left,
            top : top - lineSpaceBox.top
        };
    }

    function charCoords(cm, pos, context, lineObj, bias) {
        if (!lineObj) {
            lineObj = getLine(cm.doc, pos.line);
        }
        return intoCoordSystem(cm, lineObj, measureChar(cm, lineObj, pos.ch, bias), context);
    }

    // Returns a box for a given cursor position, which may have an 'other' property
    // containing the position of the secondary cursor on a bidi boundary.
    function cursorCoords(cm, pos, context, lineObj, preparedMeasure, varHeight) {
        lineObj = lineObj || getLine(cm.doc, pos.line);
        if (!preparedMeasure) {
            preparedMeasure = prepareMeasureForLine(cm, lineObj);
        }
        function get(ch, right) {
            var m = measureCharPrepared(cm, preparedMeasure, ch, right
                ? "right"
                : "left",
            varHeight);
            if (right) {
                m.left = m.right;
            } else {
                m.right = m.left;
            }
            return intoCoordSystem(cm, lineObj, m, context);
        }
        function getBidi(ch, partPos) {
            var part  = order[partPos],
                right = part.level % 2;
            if (ch == bidiLeft(part) && partPos && part.level < order[partPos - 1].level) {
                part  = order[partPos -= 1];
                ch    = bidiRight(part) - (part.level % 2
                    ? 0
                    : 1);
                right = true;
            } else if (ch == bidiRight(part) && partPos < order.length - 1 && part.level < order[partPos + 1].level) {
                part  = order[partPos += 1];
                ch    = bidiLeft(part) - part.level % 2;
                right = false;
            }
            if (right && ch == part.to && ch > part.from) {
                return get(ch - 1);
            }
            return get(ch, right);
        }
        var order = getOrder(lineObj),
            ch    = pos.ch;
        if (!order) {
            return get(ch);
        }
        var partPos = getBidiPartAt(order, ch);
        var val = getBidi(ch, partPos);
        if (bidiOther != null) {
            val.other = getBidi(ch, bidiOther);
        }
        return val;
    }

    // Used to cheaply estimate the coordinates for a position. Used for
    // intermediate scroll updates.
    function estimateCoords(cm, pos) {
        var left = 0,
            pos  = clipPos(cm.doc, pos);
        if (!cm.options.lineWrapping) {
            left = charWidth(cm.display) * pos.ch;
        }
        var lineObj = getLine(cm.doc, pos.line);
        var top = heightAtLine(lineObj) + paddingTop(cm.display);
        return {
            bottom: top + lineObj.height,
            left  : left,
            right : left,
            top   : top
        };
    }

    // Positions returned by coordsChar contain some extra information. xRel is the
    // relative x position of the input coordinates compared to the found position
    // (so xRel > 0 means the coordinates are to the right of the character
    // position, for example). When outside is true, that means the coordinates lie
    // outside the line's vertical range.
    function PosWithInfo(line, ch, outside, xRel) {
        var pos = Pos(line, ch);
        pos.xRel = xRel;
        if (outside) {
            pos.outside = true;
        }
        return pos;
    }

    // Compute the character position closest to the given coordinates. Input must
    // be lineSpace-local ("div" coordinate system).
    function coordsChar(cm, x, y) {
        var doc = cm.doc;
        y += cm.display.viewOffset;
        if (y < 0) {
            return PosWithInfo(doc.first, 0, true, -1);
        }
        var lineN = lineAtHeight(doc, y),
            last  = doc.first + doc.size - 1;
        if (lineN > last) {
            return PosWithInfo(doc.first + doc.size - 1, getLine(doc, last).text.length, true, 1);
        }
        if (x < 0) {
            x = 0;
        }

        var lineObj = getLine(doc, lineN);
        for (;;) {
            var found = coordsCharInner(cm, lineObj, lineN, x, y);
            var merged = collapsedSpanAtEnd(lineObj);
            var mergedPos = merged && merged.find(0, true);
            if (merged && (found.ch > mergedPos.from.ch || found.ch == mergedPos.from.ch && found.xRel > 0)) {
                lineN = lineNo(lineObj = mergedPos.to.line);
            } else {
                return found;
            }
        }
    }

    function coordsCharInner(cm, lineObj, lineNo, x, y) {
        var innerOff = y - heightAtLine(lineObj);
        var wrongLine = false,
            adjust    = 2 * cm.display.wrapper.clientWidth;
        var preparedMeasure = prepareMeasureForLine(cm, lineObj);

        function getX(ch) {
            var sp = cursorCoords(cm, Pos(lineNo, ch), "line", lineObj, preparedMeasure);
            wrongLine = true;
            if (innerOff > sp.bottom) {
                return sp.left - adjust;
            } else if (innerOff < sp.top) {
                return sp.left + adjust;
            } else {
                wrongLine = false;
            }
            return sp.left;
        }

        var bidi = getOrder(lineObj),
            dist = lineObj.text.length;
        var from = lineLeft(lineObj),
            to   = lineRight(lineObj);
        var fromX       = getX(from),
            fromOutside = wrongLine,
            toX         = getX(to),
            toOutside   = wrongLine;

        if (x > toX) {
            return PosWithInfo(lineNo, to, toOutside, 1);
        }
        // Do a binary search between these bounds.
        for (;;) {
            if (bidi
                ? to == from || to == moveVisually(lineObj, from, 1)
                : to - from <= 1) {
                var ch = x < fromX || x - fromX <= toX - x
                    ? from
                    : to;
                var xDiff = x - (ch == from
                    ? fromX
                    : toX);
                while (isExtendingChar(lineObj.text.charAt(ch))) {
                    ++ch;
                }
                var pos = PosWithInfo(lineNo, ch, ch == from
                    ? fromOutside
                    : toOutside,
                xDiff < -1
                    ? -1
                    : xDiff > 1
                        ? 1
                        : 0);
                return pos;
            }
            var step   = Math.ceil(dist / 2),
                middle = from + step;
            if (bidi) {
                middle = from;
                for (var i = 0; i < step; i += 1) {
                    middle = moveVisually(lineObj, middle, 1);
                }
            }
            var middleX = getX(middle);
            if (middleX > x) {
                to  = middle;
                toX = middleX;
                if (toOutside = wrongLine) {
                    toX += 1000;
                }
                dist = step;
            } else {
                from        = middle;
                fromX       = middleX;
                fromOutside = wrongLine;
                dist        -= step;
            }
        }
    }

    var measureText;
    // Compute the default text height.
    function textHeight(display) {
        if (display.cachedTextHeight != null) {
            return display.cachedTextHeight;
        }
        if (measureText == null) {
            measureText = elt("pre");
            // Measure a bunch of lines, for browsers that compute fractional heights.
            for (var i = 0; i < 49; i += 1) {
                measureText.appendChild(document.createTextNode("x"));
                measureText.appendChild(elt("br"));
            }
            measureText.appendChild(document.createTextNode("x"));
        }
        removeChildrenAndAdd(display.measure, measureText);
        var height = measureText.offsetHeight / 50;
        if (height > 3) {
            display.cachedTextHeight = height;
        }
        removeChildren(display.measure);
        return height || 1;
    }

    // Compute the default character width.
    function charWidth(display) {
        if (display.cachedCharWidth != null) {
            return display.cachedCharWidth;
        }
        var anchor = elt("span", "xxxxxxxxxx");
        var pre = elt("pre", [anchor]);
        removeChildrenAndAdd(display.measure, pre);
        var rect  = anchor.getBoundingClientRect(),
            width = (rect.right - rect.left) / 10;
        if (width > 2) {
            display.cachedCharWidth = width;
        }
        return width || 10;
    }

    // OPERATIONS Operations are used to wrap a series of changes to the editor
    // state in such a way that each change won't have to update the cursor and
    // display (which would be awkward, slow, and error-prone). Instead, display
    // updates are batched and then all combined and executed at once.

    var operationGroup = null;

    var nextOpId = 0;
    // Start a new operation.
    function startOperation(cm) {
        cm.curOp = {
            changeObjs            : null, // Accumulated changes, for firing change events
            cm                    : cm,
            cursorActivityCalled  : 0, // Tracks which cursorActivity handlers have been called already
            cursorActivityHandlers: null, // Set of handlers to fire cursorActivity on
            forceUpdate           : false, // Used to force a redraw
            id                    : ++nextOpId, // Unique ID
            scrollLeft            : null,
            scrollTop             : null, // Intermediate scroll position, not pushed to DOM yet
            scrollToPos           : null, // Used to scroll to a specific position
            selectionChanged      : false, // Whether the selection needs to be redrawn
            startHeight           : cm.doc.height, // Used to detect need to update scrollbar
            typing                : false, // Whether this reset should be careful to leave existing text (for compositing)
            updateInput           : null, // Whether to reset the input textarea
            updateMaxLine         : false, // Set when the widest line needs to be determined anew
            viewChanged           : false // Flag that indicates that lines might need to be redrawn
        };
        if (operationGroup) {
            operationGroup
                .ops
                .push(cm.curOp);
        } else {
            cm.curOp.ownsGroup = operationGroup = {
                delayedCallbacks: [],
                ops             : [cm.curOp]
            };
        }
    }

    function fireCallbacksForOps(group) {
        // Calls delayed callbacks and cursorActivity handlers until no new ones appear
        var callbacks = group.delayedCallbacks,
            i         = 0;
        do {
            for (; i < callbacks.length; i += 1) {
                callbacks[i]();
            }
            for (var j = 0; j < group.ops.length; j += 1) {
                var op = group.ops[j];
                if (op.cursorActivityHandlers) {
                    while (op.cursorActivityCalled < op.cursorActivityHandlers.length) {
                        op.cursorActivityHandlers[op.cursorActivityCalled++](op.cm);
                    }
                }
            }
        } while (i < callbacks.length);
    }

    // Finish an operation, updating the display and signalling delayed events
    function endOperation(cm) {
        var op    = cm.curOp,
            group = op.ownsGroup;
        if (!group) {
            return;
        }

        try {
            fireCallbacksForOps(group);
        } finally {
            operationGroup = null;
            for (var i = 0; i < group.ops.length; i += 1) {
                group
                    .ops[i]
                    .cm
                    .curOp = null;
            }
            endOperations(group);
        }
    }

    // The DOM updates done when an operation finishes are batched so that the
    // minimum number of relayouts are required.
    function endOperations(group) {
        var ops = group.ops;
        for (var i = 0; i < ops.length; i += 1) { // Read DOM
            endOperation_R1(ops[i]);
        }
        for (var i = 0; i < ops.length; i += 1) { // Write DOM (maybe)
            endOperation_W1(ops[i]);
        }
        for (var i = 0; i < ops.length; i += 1) { // Read DOM
            endOperation_R2(ops[i]);
        }
        for (var i = 0; i < ops.length; i += 1) { // Write DOM (maybe)
            endOperation_W2(ops[i]);
        }
        for (var i = 0; i < ops.length; i += 1) { // Read DOM
            endOperation_finish(ops[i]);
        }
    }

    function endOperation_R1(op) {
        var cm      = op.cm,
            display = cm.display;
        maybeClipScrollbars(cm);
        if (op.updateMaxLine) {
            findMaxLine(cm);
        }

        op.mustUpdate = op.viewChanged || op.forceUpdate || op.scrollTop != null || op.scrollToPos && (op.scrollToPos.from.line < display.viewFrom || op.scrollToPos.to.line >= display.viewTo) || display.maxLineChanged && cm.options.lineWrapping;
        op.update     = op.mustUpdate && new DisplayUpdate(cm, op.mustUpdate && {
            top   : op.scrollTop,
            ensure: op.scrollToPos
        }, op.forceUpdate);
    }

    function endOperation_W1(op) {
        op.updatedDisplay = op.mustUpdate && updateDisplayIfNeeded(op.cm, op.update);
    }

    function endOperation_R2(op) {
        var cm      = op.cm,
            display = cm.display;
        if (op.updatedDisplay) {
            updateHeightsInViewport(cm);
        }

        op.barMeasure = measureForScrollbars(cm);

        // If the max line changed since it was last measured, measure it, and ensure
        // the document's width matches it. updateDisplay_W2 will use these properties
        // to do the actual resizing
        if (display.maxLineChanged && !cm.options.lineWrapping) {
            op.adjustWidthTo          = measureChar(cm, display.maxLine, display.maxLine.text.length).left + 3;
            cm.display.sizerWidth     = op.adjustWidthTo;
            op.barMeasure.scrollWidth = Math.max(display.scroller.clientWidth, display.sizer.offsetLeft +
                    op.adjustWidthTo + scrollGap(cm) + cm.display.barWidth);
            op.maxScrollLeft          = Math.max(0, display.sizer.offsetLeft + op.adjustWidthTo - displayWidth(cm));
        }

        if (op.updatedDisplay || op.selectionChanged) {
            op.newSelectionNodes = drawSelection(cm);
        }
    }

    function endOperation_W2(op) {
        var cm = op.cm;

        if (op.adjustWidthTo != null) {
            cm.display.sizer.style.minWidth = op.adjustWidthTo + "px";
            if (op.maxScrollLeft < cm.doc.scrollLeft) {
                setScrollLeft(cm, Math.min(cm.display.scroller.scrollLeft, op.maxScrollLeft), true);
            }
            cm.display.maxLineChanged = false;
        }

        if (op.newSelectionNodes) {
            showSelection(cm, op.newSelectionNodes);
        }
        if (op.updatedDisplay) {
            setDocumentHeight(cm, op.barMeasure);
        }
        if (op.updatedDisplay || op.startHeight != cm.doc.height) {
            updateScrollbars(cm, op.barMeasure);
        }

        if (op.selectionChanged) {
            restartBlink(cm);
        }

        if (cm.state.focused && op.updateInput) {
            resetInput(cm, op.typing);
        }
    }

    function endOperation_finish(op) {
        var cm      = op.cm,
            display = cm.display,
            doc     = cm.doc;

        if (op.updatedDisplay) {
            postUpdateDisplay(cm, op.update);
        }

        // Abort mouse wheel delta measurement, when scrolling explicitly
        if (display.wheelStartX != null && (op.scrollTop != null || op.scrollLeft != null || op.scrollToPos)) {
            display.wheelStartX = display.wheelStartY = null;
        }

        // Propagate the scroll position to the actual DOM scroller
        if (op.scrollTop != null && (display.scroller.scrollTop != op.scrollTop || op.forceScroll)) {
            doc.scrollTop = Math.max(0, Math.min(display.scroller.scrollHeight - display.scroller.clientHeight, op.scrollTop));
            display
                .scrollbars
                .setScrollTop(doc.scrollTop);
            display.scroller.scrollTop = doc.scrollTop;
        }
        if (op.scrollLeft != null && (display.scroller.scrollLeft != op.scrollLeft || op.forceScroll)) {
            doc.scrollLeft = Math.max(0, Math.min(display.scroller.scrollWidth - displayWidth(cm), op.scrollLeft));
            display
                .scrollbars
                .setScrollLeft(doc.scrollLeft);
            display.scroller.scrollLeft = doc.scrollLeft;
            alignHorizontally(cm);
        }
        // If we need to scroll a specific position into view, do so.
        if (op.scrollToPos) {
            var coords = scrollPosIntoView(cm, clipPos(doc, op.scrollToPos.from), clipPos(doc, op.scrollToPos.to), op.scrollToPos.margin);
            if (op.scrollToPos.isCursor && cm.state.focused) {
                maybeScrollWindow(cm, coords);
            }
        }

        // Fire events for markers that are hidden/unidden by editing or undoing
        var hidden   = op.maybeHiddenMarkers,
            unhidden = op.maybeUnhiddenMarkers;
        if (hidden) {
            for (var i = 0; i < hidden.length; i += 1) {
                if (!hidden[i].lines.length) {
                    signal(hidden[i], "hide");
                }
            }
        }
        if (unhidden) {
            for (var i = 0; i < unhidden.length; i += 1) {
                if (unhidden[i].lines.length) {
                    signal(unhidden[i], "unhide");
                }
            }
        }

        if (display.wrapper.offsetHeight) {
            doc.scrollTop = cm.display.scroller.scrollTop;
        }

        // Fire change events, and delayed event handlers
        if (op.changeObjs) {
            signal(cm, "changes", cm, op.changeObjs);
        }
    }

    // Run the given function in an operation
    function runInOp(cm, f) {
        if (cm.curOp) {
            return f();
        }
        startOperation(cm);
        try {
            return f();
        } finally {
            endOperation(cm);
        }
    }
    // Wraps a function in an operation. Returns the wrapped function.
    function operation(cm, f) {
        return function () {
            if (cm.curOp) {
                return f.apply(cm, arguments);
            }
            startOperation(cm);
            try {
                return f.apply(cm, arguments);
            } finally {
                endOperation(cm);
            }
        };
    }
    // Used to add methods to editor and doc instances, wrapping them in operations.
    function methodOp(f) {
        return function () {
            if (this.curOp) {
                return f.apply(this, arguments);
            }
            startOperation(this);
            try {
                return f.apply(this, arguments);
            } finally {
                endOperation(this);
            }
        };
    }
    function docMethodOp(f) {
        return function () {
            var cm = this.cm;
            if (!cm || cm.curOp) {
                return f.apply(this, arguments);
            }
            startOperation(cm);
            try {
                return f.apply(this, arguments);
            } finally {
                endOperation(cm);
            }
        };
    }

    // VIEW TRACKING These objects are used to represent the visible (currently
    // drawn) part of the document. A LineView may correspond to multiple logical
    // lines, if those are connected by collapsed ranges.
    function LineView(doc, line, lineN) {
        // The starting line
        this.line   = line;
        // Continuing lines, if any
        this.rest   = visualLineContinued(line);
        // Number of logical lines in this visual line
        this.size   = this.rest
            ? lineNo(lst(this.rest)) - lineN + 1
            : 1;
        this.node   = this.text = null;
        this.hidden = lineIsHidden(doc, line);
    }

    // Create a range of LineView objects for the given lines.
    function buildViewArray(cm, from, to) {
        var array = [],
            nextPos;
        for (var pos = from; pos < to; pos = nextPos) {
            var view = new LineView(cm.doc, getLine(cm.doc, pos), pos);
            nextPos = pos + view.size;
            array.push(view);
        }
        return array;
    }

    // Updates the display.view data structure for a given change to the document.
    // From and to are in pre-change coordinates. Lendiff is the amount of lines
    // added or subtracted by the change. This is used for changes that span
    // multiple lines, or change the way lines are divided into visual lines.
    // regLineChange (below) registers single-line changes.
    function regChange(cm, from, to, lendiff) {
        if (from == null) {
            from = cm.doc.first;
        }
        if (to == null) {
            to = cm.doc.first + cm.doc.size;
        }
        if (!lendiff) {
            lendiff = 0;
        }

        var display = cm.display;
        if (lendiff && to < display.viewTo && (display.updateLineNumbers == null || display.updateLineNumbers > from)) {
            display.updateLineNumbers = from;
        }

        cm.curOp.viewChanged = true;

        if (from >= display.viewTo) { // Change after
            if (sawCollapsedSpans && visualLineNo(cm.doc, from) < display.viewTo) {
                resetView(cm);
            }
        } else if (to <= display.viewFrom) { // Change before
            if (sawCollapsedSpans && visualLineEndNo(cm.doc, to + lendiff) > display.viewFrom) {
                resetView(cm);
            } else {
                display.viewFrom += lendiff;
                display.viewTo   += lendiff;
            }
        } else if (from <= display.viewFrom && to >= display.viewTo) { // Full overlap
            resetView(cm);
        } else if (from <= display.viewFrom) { // Top overlap
            var cut = viewCuttingPoint(cm, to, to + lendiff, 1);
            if (cut) {
                display.view     = display
                    .view
                    .slice(cut.index);
                display.viewFrom = cut.lineN;
                display.viewTo   += lendiff;
            } else {
                resetView(cm);
            }
        } else if (to >= display.viewTo) { // Bottom overlap
            var cut = viewCuttingPoint(cm, from, from, -1);
            if (cut) {
                display.view   = display
                    .view
                    .slice(0, cut.index);
                display.viewTo = cut.lineN;
            } else {
                resetView(cm);
            }
        } else { // Gap in the middle
            var cutTop = viewCuttingPoint(cm, from, from, -1);
            var cutBot = viewCuttingPoint(cm, to, to + lendiff, 1);
            if (cutTop && cutBot) {
                display.view   = display
                    .view
                    .slice(0, cutTop.index)
                    .concat(buildViewArray(cm, cutTop.lineN, cutBot.lineN))
                    .concat(display.view.slice(cutBot.index));
                display.viewTo += lendiff;
            } else {
                resetView(cm);
            }
        }

        var ext = display.externalMeasured;
        if (ext) {
            if (to < ext.lineN) {
                ext.lineN += lendiff;
            } else if (from < ext.lineN + ext.size) {
                display.externalMeasured = null;
            }
        }
    }

    // Register a change to a single line. Type must be one of "text", "gutter",
    // "class", "widget"
    function regLineChange(cm, line, type) {
        cm.curOp.viewChanged = true;
        var display = cm.display,
            ext     = cm.display.externalMeasured;
        if (ext && line >= ext.lineN && line < ext.lineN + ext.size) {
            display.externalMeasured = null;
        }

        if (line < display.viewFrom || line >= display.viewTo) {
            return;
        }
        var lineView = display.view[findViewIndex(cm, line)];
        if (lineView.node == null) {
            return;
        }
        var arr = lineView.changes || (lineView.changes = []);
        if (indexOf(arr, type) == -1) {
            arr.push(type);
        }
    }

    // Clear the view.
    function resetView(cm) {
        cm.display.viewFrom   = cm.display.viewTo = cm.doc.first;
        cm.display.view       = [];
        cm.display.viewOffset = 0;
    }

    // Find the view element corresponding to a given line. Return null when the
    // line isn't visible.
    function findViewIndex(cm, n) {
        if (n >= cm.display.viewTo) {
            return null;
        }
        n -= cm.display.viewFrom;
        if (n < 0) {
            return null;
        }
        var view = cm.display.view;
        for (var i = 0; i < view.length; i += 1) {
            n -= view[i].size;
            if (n < 0) {
                return i;
            }
        }
    }

    function viewCuttingPoint(cm, oldN, newN, dir) {
        var index = findViewIndex(cm, oldN),
            diff,
            view  = cm.display.view;
        if (!sawCollapsedSpans || newN == cm.doc.first + cm.doc.size) {
            return {index: index, lineN: newN};
        }
        for (var i = 0, n = cm.display.viewFrom; i < index; i += 1) {
            n += view[i].size;
        }
        if (n != oldN) {
            if (dir > 0) {
                if (index == view.length - 1) {
                    return null;
                }
                diff  = (n + view[index].size) - oldN;
                index += 1;
            } else {
                diff = n - oldN;
            }
            oldN += diff;
            newN += diff;
        }
        while (visualLineNo(cm.doc, newN) != newN) {
            if (index == (dir < 0
                ? 0
                : view.length - 1)) {
                return null;
            }
            newN  += dir * view[index - (dir < 0
                    ? 1
                    : 0)].size;
            index += dir;
        }
        return {index: index, lineN: newN};
    }

    // Force the view to cover a given range, adding empty view element or clipping
    // off existing ones as needed.
    function adjustView(cm, from, to) {
        var display = cm.display,
            view    = display.view;
        if (view.length == 0 || from >= display.viewTo || to <= display.viewFrom) {
            display.view     = buildViewArray(cm, from, to);
            display.viewFrom = from;
        } else {
            if (display.viewFrom > from) {
                display.view = buildViewArray(cm, from, display.viewFrom).concat(display.view);
            } else if (display.viewFrom < from) {
                display.view = display
                    .view
                    .slice(findViewIndex(cm, from));
            }
            display.viewFrom = from;
            if (display.viewTo < to) {
                display.view = display
                    .view
                    .concat(buildViewArray(cm, display.viewTo, to));
            } else if (display.viewTo > to) {
                display.view = display
                    .view
                    .slice(0, findViewIndex(cm, to));
            }
        }
        display.viewTo = to;
    }

    // Count the number of lines in the view whose DOM representation is out of date
    // (or nonexistent).
    function countDirtyView(cm) {
        var view  = cm.display.view,
            dirty = 0;
        for (var i = 0; i < view.length; i += 1) {
            var lineView = view[i];
            if (!lineView.hidden && (!lineView.node || lineView.changes)) {
                ++dirty;
            }
        }
        return dirty;
    }

    // INPUT HANDLING Poll for input changes, using the normal rate of polling. This
    // runs as long as the editor is focused.
    function slowPoll(cm) {
        if (cm.display.pollingFast) {
            return;
        }
        cm
            .display
            .poll
            .set(cm.options.pollInterval, function () {
                readInput(cm);
                if (cm.state.focused) {
                    slowPoll(cm);
                }
            });
    }

    // When an event has just come in that is likely to add or change something in
    // the input textarea, we poll faster, to ensure that the change appears on the
    // screen quickly.
    function fastPoll(cm) {
        var missed = false;
        cm.display.pollingFast = true;
        function p() {
            var changed = readInput(cm);
            if (!changed && !missed) {
                missed = true;
                cm
                    .display
                    .poll
                    .set(60, p);
            } else {
                cm.display.pollingFast = false;
                slowPoll(cm);
            }
        }
        cm
            .display
            .poll
            .set(20, p);
    }

    // This will be set to an array of strings when copying, so that, when pasting,
    // we know what kind of selections the copied text was made out of.
    var lastCopied = null;

    // Read input from the textarea, and update the document to match. When
    // something is selected, it is present in the textarea, and selected (unless it
    // is huge, in which case a placeholder is used). When nothing is selected, the
    // cursor sits after previously seen text (can be empty), which is stored in
    // prevInput (we must not reset the textarea when typing, because that breaks
    // IME).
    function readInput(cm) {
        var input     = cm.display.input,
            prevInput = cm.display.prevInput,
            doc       = cm.doc;
        // Since this is called a *lot*, try to bail out as cheaply as possible when it
        // is clear that nothing happened. hasSelection will be the case when there is a
        // lot of text in the textarea, in which case reading its value would be
        // expensive.
        if (!cm.state.focused || (hasSelection(input) && !prevInput) || isReadOnly(cm) || cm.options.disableInput || cm.state.keySeq) {
            return false;
        }
        // See paste handler for more on the fakedLastChar kludge
        if (cm.state.pasteIncoming && cm.state.fakedLastChar) {
            input.value            = input
                .value
                .substring(0, input.value.length - 1);
            cm.state.fakedLastChar = false;
        }
        var text = input.value;
        // If nothing changed, bail.
        if (text == prevInput && !cm.somethingSelected()) {
            return false;
        }
        // Work around nonsensical selection resetting in IE9/10, and inexplicable
        // appearance of private area unicode characters on some key combos in Mac
        // (#2689).
        if (ie && ie_version >= 9 && cm.display.inputHasSelection === text || mac && /[\uf700-\uf7ff]/.test(text)) {
            resetInput(cm);
            return false;
        }

        var withOp = !cm.curOp;
        if (withOp) {
            startOperation(cm);
        }
        cm.display.shift = false;

        if (text.charCodeAt(0) == 0x200b && doc.sel == cm.display.selForContextMenu && !prevInput) {
            prevInput = "\u200b";
        }
        // Find the part of the input that is actually new
        var same = 0,
            l    = Math.min(prevInput.length, text.length);
        while (same < l && prevInput.charCodeAt(same) == text.charCodeAt(same)) {
            ++same;
        }
        var inserted  = text.slice(same),
            textLines = splitLines(inserted);

        // When pasing N lines into N selections, insert one line per selection
        var multiPaste = null;
        if (cm.state.pasteIncoming && doc.sel.ranges.length > 1) {
            if (lastCopied && lastCopied.join("\n") == inserted) {
                multiPaste = doc.sel.ranges.length % lastCopied.length == 0 && map(lastCopied, splitLines);
            } else if (textLines.length == doc.sel.ranges.length) {
                multiPaste = map(textLines, function (l) {
                    return [l];
                });
            }
        }

        // Normal behavior is to insert the new text into every selection
        for (var i = doc.sel.ranges.length - 1; i >= 0; i -= 1) {
            var range = doc
                .sel
                .ranges[i];
            var from = range.from(),
                to   = range.to();
            // Handle deletion
            if (same < prevInput.length) {
                from = Pos(from.line, from.ch - (prevInput.length - same)); // Handle overwrite
            } else if (cm.state.overwrite && range.empty() && !cm.state.pasteIncoming) {
                to = Pos(to.line, Math.min(getLine(doc, to.line).text.length, to.ch + lst(textLines).length));
            }
            var updateInput = cm.curOp.updateInput;
            var changeEvent = {
                from  : from,
                origin: cm.state.pasteIncoming
                    ? "paste"
                    : cm.state.cutIncoming
                        ? "cut"
                        : "+input",
                text  : multiPaste
                    ? multiPaste[i % multiPaste.length]
                    : textLines,
                to    : to
            };
            makeChange(cm.doc, changeEvent);
            signalLater(cm, "inputRead", cm, changeEvent);
            // When an 'electric' character is inserted, immediately trigger a reindent
            if (inserted && !cm.state.pasteIncoming && cm.options.electricChars && cm.options.smartIndent && range.head.ch < 100 && (!i || doc.sel.ranges[i - 1].head.line != range.head.line)) {
                var mode = cm.getModeAt(range.head);
                var end = changeEnd(changeEvent);
                if (mode.electricChars) {
                    for (var j = 0; j < mode.electricChars.length; j += 1) {
                        if (inserted.indexOf(mode.electricChars.charAt(j)) > -1) {
                            indentLine(cm, end.line, "smart");
                            break;
                        }
                    }
                } else if (mode.electricInput) {
                    if (mode.electricInput.test(getLine(doc, end.line).text.slice(0, end.ch))) {
                        indentLine(cm, end.line, "smart");
                    }
                }
            }
        }
        ensureCursorVisible(cm);
        cm.curOp.updateInput = updateInput;
        cm.curOp.typing      = true;

        // Don't leave long text in the textarea, since it makes further polling slow
        if (text.length > 1000 || text.indexOf("\n") > -1) {
            input.value = cm.display.prevInput = "";
        } else {
            cm.display.prevInput = text;
        }
        if (withOp) {
            endOperation(cm);
        }
        cm.state.pasteIncoming = cm.state.cutIncoming = false;
        return true;
    }

    // Reset the input to correspond to the selection (or to be empty, when not
    // typing and nothing is selected)
    function resetInput(cm, typing) {
        if (cm.display.contextMenuPending) {
            return;
        }
        var minimal,
            selected,
            doc = cm.doc;
        if (cm.somethingSelected()) {
            cm.display.prevInput = "";
            var range = doc
                .sel
                .primary();
            minimal = hasCopyEvent && (range.to().line - range.from().line > 100 || (selected = cm.getSelection()).length > 1000);
            var content = minimal
                ? "-"
                : selected || cm.getSelection();
            cm.display.input.value = content;
            if (cm.state.focused) {
                selectInput(cm.display.input);
            }
            if (ie && ie_version >= 9) {
                cm.display.inputHasSelection = content;
            }
        } else if (!typing) {
            cm.display.prevInput = cm.display.input.value = "";
            if (ie && ie_version >= 9) {
                cm.display.inputHasSelection = null;
            }
        }
        cm.display.inaccurateSelection = minimal;
    }

    function focusInput(cm) {
        if (cm.options.readOnly != "nocursor" && (!mobile || activeElt() != cm.display.input)) {
            cm
                .display
                .input
                .focus();
        }
    }

    function ensureFocus(cm) {
        if (!cm.state.focused) {
            focusInput(cm);
            onFocus(cm);
        }
    }

    function isReadOnly(cm) {
        return cm.options.readOnly || cm.doc.cantEdit;
    }

    // EVENT HANDLERS Attach the necessary event handlers when initializing the
    // editor
    function registerEventHandlers(cm) {
        var d = cm.display;
        on(d.scroller, "mousedown", operation(cm, onMouseDown));
        // Older IE's will not fire a second mousedown for a double click
        if (ie && ie_version < 11) {
            on(d.scroller, "dblclick", operation(cm, function (e) {
                if (signalDOMEvent(cm, e)) {
                    return;
                }
                var pos = posFromMouse(cm, e);
                if (!pos || clickInGutter(cm, e) || eventInWidget(cm.display, e)) {
                    return;
                }
                e_preventDefault(e);
                var word = cm.findWordAt(pos);
                extendSelection(cm.doc, word.anchor, word.head);
            }));
        } else {
            on(d.scroller, "dblclick", function (e) {
                signalDOMEvent(cm, e) || e_preventDefault(e);
            });
        }
        // Prevent normal selection in the editor (we handle our own)
        on(d.lineSpace, "selectstart", function (e) {
            if (!eventInWidget(d, e)) {
                e_preventDefault(e);
            }
        });
        // Some browsers fire contextmenu *after* opening the menu, at which point we
        // can't mess with it anymore. Context menu is handled in onMouseDown for these
        // browsers.
        if (!captureRightClick) {
            on(d.scroller, "contextmenu", function (e) {
                onContextMenu(cm, e);
            });
        }

        // Sync scrolling between fake scrollbars and real scrollable area, ensure
        // viewport is updated when scrolling.
        on(d.scroller, "scroll", function () {
            if (d.scroller.clientHeight) {
                setScrollTop(cm, d.scroller.scrollTop);
                setScrollLeft(cm, d.scroller.scrollLeft, true);
                signal(cm, "scroll", cm);
            }
        });

        // Listen to wheel events in order to try and update the viewport on time.
        on(d.scroller, "mousewheel", function (e) {
            onScrollWheel(cm, e);
        });
        on(d.scroller, "DOMMouseScroll", function (e) {
            onScrollWheel(cm, e);
        });

        // Prevent wrapper from ever scrolling
        on(d.wrapper, "scroll", function () {
            d.wrapper.scrollTop = d.wrapper.scrollLeft = 0;
        });

        on(d.input, "keyup", function (e) {
            onKeyUp.call(cm, e);
        });
        on(d.input, "input", function () {
            if (ie && ie_version >= 9 && cm.display.inputHasSelection) {
                cm.display.inputHasSelection = null;
            }
            readInput(cm);
        });
        on(d.input, "keydown", operation(cm, onKeyDown));
        on(d.input, "keypress", operation(cm, onKeyPress));
        on(d.input, "focus", bind(onFocus, cm));
        on(d.input, "blur", bind(onBlur, cm));

        function drag_(e) {
            if (!signalDOMEvent(cm, e)) {
                e_stop(e);
            }
        }
        if (cm.options.dragDrop) {
            on(d.scroller, "dragstart", function (e) {
                onDragStart(cm, e);
            });
            on(d.scroller, "dragenter", drag_);
            on(d.scroller, "dragover", drag_);
            on(d.scroller, "drop", operation(cm, onDrop));
        }
        on(d.scroller, "paste", function (e) {
            if (eventInWidget(d, e)) {
                return;
            }
            cm.state.pasteIncoming = true;
            focusInput(cm);
            fastPoll(cm);
        });
        on(d.input, "paste", function () {
            // Workaround for webkit bug https://bugs.webkit.org/show_bug.cgi?id=90206 Add a
            // char to the end of textarea before paste occur so that selection doesn't span
            // to the end of textarea.
            if (webkit && !cm.state.fakedLastChar && !(new Date - cm.state.lastMiddleDown < 200)) {
                var start = d.input.selectionStart,
                    end   = d.input.selectionEnd;
                d.input.value          += "$";
                // The selection end needs to be set before the start, otherwise there can be an
                // intermediate non-empty selection between the two, which can override the
                // middle-click paste buffer on linux and cause the wrong thing to get pasted.
                d.input.selectionEnd   = end;
                d.input.selectionStart = start;
                cm.state.fakedLastChar = true;
            }
            cm.state.pasteIncoming = true;
            fastPoll(cm);
        });

        function prepareCopyCut(e) {
            if (cm.somethingSelected()) {
                lastCopied = cm.getSelections();
                if (d.inaccurateSelection) {
                    d.prevInput           = "";
                    d.inaccurateSelection = false;
                    d.input.value         = lastCopied.join("\n");
                    selectInput(d.input);
                }
            } else {
                var text   = [],
                    ranges = [];
                for (var i = 0; i < cm.doc.sel.ranges.length; i += 1) {
                    var line = cm
                        .doc
                        .sel
                        .ranges[i]
                        .head
                        .line;
                    var lineRange = {
                        anchor: Pos(line, 0),
                        head  : Pos(line + 1, 0)
                    };
                    ranges.push(lineRange);
                    text.push(cm.getRange(lineRange.anchor, lineRange.head));
                }
                if (e.type == "cut") {
                    cm.setSelections(ranges, null, sel_dontScroll);
                } else {
                    d.prevInput   = "";
                    d.input.value = text.join("\n");
                    selectInput(d.input);
                }
                lastCopied = text;
            }
            if (e.type == "cut") {
                cm.state.cutIncoming = true;
            }
        }
        on(d.input, "cut", prepareCopyCut);
        on(d.input, "copy", prepareCopyCut);

        // Needed to handle Tab key in KHTML
        if (khtml) {
            on(d.sizer, "mouseup", function () {
                if (activeElt() == d.input) {
                    d
                        .input
                        .blur();
                }
                focusInput(cm);
            });
        }
    }

    // Called when the window resizes
    function onResize(cm) {
        var d = cm.display;
        if (d.lastWrapHeight == d.wrapper.clientHeight && d.lastWrapWidth == d.wrapper.clientWidth) {
            return;
        }
        // Might be a text scaling operation, clear size caches.
        d.cachedCharWidth   = d.cachedTextHeight = d.cachedPaddingH = null;
        d.scrollbarsClipped = false;
        cm.setSize();
    }

    // MOUSE EVENTS Return true when the given mouse event happened in a widget
    function eventInWidget(display, e) {
        for (var n = e_target(e); n != display.wrapper; n = n.parentNode) {
            if (!n || (n.nodeType == 1 && n.getAttribute("cm-ignore-events") == "true") || (n.parentNode == display.sizer && n != display.mover)) {
                return true;
            }
        }
    }

    // Given a mouse event, find the corresponding position. If liberal is false, it
    // checks whether a gutter or scrollbar was clicked, and returns null if it was.
    // forRect is used by rectangular selections, and tries to estimate a character
    // position even for coordinates beyond the right of the text.
    function posFromMouse(cm, e, liberal, forRect) {
        var display = cm.display;
        if (!liberal && e_target(e).getAttribute("not-content") == "true") {
            return null;
        }

        var x,
            y,
            space = display
                .lineSpace
                .getBoundingClientRect();
        // Fails unpredictably on IE[67] when mouse is dragged around quickly.
        try {
            x = e.clientX - space.left;
            y = e.clientY - space.top;
        } catch (e) {
            return null;
        }
        var coords = coordsChar(cm, x, y),
            line;
        if (forRect && coords.xRel == 1 && (line = getLine(cm.doc, coords.line).text).length == coords.ch) {
            var colDiff = countColumn(line, line.length, cm.options.tabSize) - line.length;
            coords = Pos(coords.line, Math.max(0, Math.round((x - paddingH(cm.display).left) / charWidth(cm.display)) - colDiff));
        }
        return coords;
    }

    // A mouse down can be a single click, double click, triple click, start of
    // selection drag, start of text drag, new cursor (ctrl-click), rectangle drag
    // (alt-drag), or xwin middle-click-paste. Or it might be a click on something
    // we should not interfere with, such as a scrollbar or widget.
    function onMouseDown(e) {
        if (signalDOMEvent(this, e)) {
            return;
        }
        var cm      = this,
            display = cm.display;
        display.shift = e.shiftKey;

        if (eventInWidget(display, e)) {
            if (!webkit) {
                // Briefly turn off draggability, to allow widgets to do normal dragging things.
                display.scroller.draggable = false;
                setTimeout(function () {
                    display.scroller.draggable = true;
                }, 100);
            }
            return;
        }
        if (clickInGutter(cm, e)) {
            return;
        }
        var start = posFromMouse(cm, e);
        window.focus();

        switch (e_button(e)) {
            case 1:
                if (start) {
                    leftButtonDown(cm, e, start);
                } else if (e_target(e) == display.scroller) {
                    e_preventDefault(e);
                }
                break;
            case 2:
                if (webkit) {
                    cm.state.lastMiddleDown = +new Date;
                }
                if (start) {
                    extendSelection(cm.doc, start);
                }
                setTimeout(bind(focusInput, cm), 20);
                e_preventDefault(e);
                break;
            case 3:
                if (captureRightClick) {
                    onContextMenu(cm, e);
                }
                break;
        }
    }

    var lastClick,
        lastDoubleClick;
    function leftButtonDown(cm, e, start) {
        setTimeout(bind(ensureFocus, cm), 0);

        var now = +new Date,
            type;
        if (lastDoubleClick && lastDoubleClick.time > now - 400 && cmp(lastDoubleClick.pos, start) == 0) {
            type = "triple";
        } else if (lastClick && lastClick.time > now - 400 && cmp(lastClick.pos, start) == 0) {
            type            = "double";
            lastDoubleClick = {
                pos : start,
                time: now
            };
        } else {
            type      = "single";
            lastClick = {
                pos : start,
                time: now
            };
        }

        var sel      = cm.doc.sel,
            modifier = mac
                ? e.metaKey
                : e.ctrlKey,
            contained;
        if (cm.options.dragDrop && dragAndDrop && !isReadOnly(cm) && type == "single" && (contained = sel.contains(start)) > -1 && !sel.ranges[contained].empty()) {
            leftButtonStartDrag(cm, e, start, modifier);
        } else {
            leftButtonSelect(cm, e, start, type, modifier);
        }
    }

    // Start a text drag. When it ends, see if any dragging actually happen, and
    // treat as a click if it didn't.
    function leftButtonStartDrag(cm, e, start, modifier) {
        var display = cm.display;
        var dragEnd = operation(cm, function (e2) {
            if (webkit) {
                display.scroller.draggable = false;
            }
            cm.state.draggingText = false;
            off(document, "mouseup", dragEnd);
            off(display.scroller, "drop", dragEnd);
            if (Math.abs(e.clientX - e2.clientX) + Math.abs(e.clientY - e2.clientY) < 10) {
                e_preventDefault(e2);
                if (!modifier) {
                    extendSelection(cm.doc, start);
                }
                focusInput(cm);
                // Work around unexplainable focus problem in IE9 (#2127)
                if (ie && ie_version == 9) {
                    setTimeout(function () {
                        document
                            .body
                            .focus();
                        focusInput(cm);
                    }, 20);
                }
            }
        });
        // Let the drag handler handle this.
        if (webkit) {
            display.scroller.draggable = true;
        }
        cm.state.draggingText = dragEnd;
        // IE's approach to draggable
        if (display.scroller.dragDrop) {
            display
                .scroller
                .dragDrop();
        }
        on(document, "mouseup", dragEnd);
        on(display.scroller, "drop", dragEnd);
    }

    // Normal selection, as opposed to text dragging.
    function leftButtonSelect(cm, e, start, type, addNew) {
        var display = cm.display,
            doc     = cm.doc;
        e_preventDefault(e);

        var ourRange,
            ourIndex,
            startSel = doc.sel,
            ranges   = startSel.ranges;
        if (addNew && !e.shiftKey) {
            ourIndex = doc
                .sel
                .contains(start);
            if (ourIndex > -1) {
                ourRange = ranges[ourIndex];
            } else {
                ourRange = new Range(start, start);
            }
        } else {
            ourRange = doc
                .sel
                .primary();
        }

        if (e.altKey) {
            type = "rect";
            if (!addNew) {
                ourRange = new Range(start, start);
            }
            start    = posFromMouse(cm, e, true, true);
            ourIndex = -1;
        } else if (type == "double") {
            var word = cm.findWordAt(start);
            if (cm.display.shift || doc.extend) {
                ourRange = extendRange(doc, ourRange, word.anchor, word.head);
            } else {
                ourRange = word;
            }
        } else if (type == "triple") {
            var line = new Range(Pos(start.line, 0), clipPos(doc, Pos(start.line + 1, 0)));
            if (cm.display.shift || doc.extend) {
                ourRange = extendRange(doc, ourRange, line.anchor, line.head);
            } else {
                ourRange = line;
            }
        } else {
            ourRange = extendRange(doc, ourRange, start);
        }

        if (!addNew) {
            ourIndex = 0;
            setSelection(doc, new Selection([ourRange], 0), sel_mouse);
            startSel = doc.sel;
        } else if (ourIndex == -1) {
            ourIndex = ranges.length;
            setSelection(doc, normalizeSelection(ranges.concat([ourRange]), ourIndex), {
                origin: "*mouse",
                scroll: false
            });
        } else if (ranges.length > 1 && ranges[ourIndex].empty() && type == "single") {
            setSelection(doc, normalizeSelection(ranges.slice(0, ourIndex).concat(ranges.slice(ourIndex +
                    1)), 0));
            startSel = doc.sel;
        } else {
            replaceOneSelection(doc, ourIndex, ourRange, sel_mouse);
        }

        var lastPos = start;
        function extendTo(pos) {
            if (cmp(lastPos, pos) == 0) {
                return;
            }
            lastPos = pos;

            if (type == "rect") {
                var ranges  = [],
                    tabSize = cm.options.tabSize;
                var startCol = countColumn(getLine(doc, start.line).text, start.ch, tabSize);
                var posCol = countColumn(getLine(doc, pos.line).text, pos.ch, tabSize);
                var left  = Math.min(startCol, posCol),
                    right = Math.max(startCol, posCol);
                for (var line = Math.min(start.line, pos.line), end = Math.min(cm.lastLine(), Math.max(start.line, pos.line)); line <= end; line += 1) {
                    var text    = getLine(doc, line).text,
                        leftPos = findColumn(text, left, tabSize);
                    if (left == right) {
                        ranges.push(new Range(Pos(line, leftPos), Pos(line, leftPos)));
                    } else if (text.length > leftPos) {
                        ranges.push(new Range(Pos(line, leftPos), Pos(line, findColumn(text, right, tabSize))));
                    }
                }
                if (!ranges.length) {
                    ranges.push(new Range(start, start));
                }
                setSelection(doc, normalizeSelection(startSel.ranges.slice(0, ourIndex).concat(ranges), ourIndex), {
                    origin: "*mouse",
                    scroll: false
                });
                cm.scrollIntoView(pos);
            } else {
                var oldRange = ourRange;
                var anchor = oldRange.anchor,
                    head   = pos;
                if (type != "single") {
                    if (type == "double") {
                        var range = cm.findWordAt(pos);
                    } else {
                        var range = new Range(Pos(pos.line, 0), clipPos(doc, Pos(pos.line + 1, 0)));
                    }
                    if (cmp(range.anchor, anchor) > 0) {
                        head   = range.head;
                        anchor = minPos(oldRange.from(), range.anchor);
                    } else {
                        head   = range.anchor;
                        anchor = maxPos(oldRange.to(), range.head);
                    }
                }
                var ranges = startSel
                    .ranges
                    .slice(0);
                ranges[ourIndex] = new Range(clipPos(doc, anchor), head);
                setSelection(doc, normalizeSelection(ranges, ourIndex), sel_mouse);
            }
        }

        var editorSize = display
            .wrapper
            .getBoundingClientRect();
        // Used to ensure timeout re-tries don't fire when another extend happened in
        // the meantime (clearTimeout isn't reliable -- at least on Chrome, the timeouts
        // still happen even when cleared, if the clear happens after their scheduled
        // firing time).
        var counter = 0;

        function extend(e) {
            var curCount = ++counter;
            var cur = posFromMouse(cm, e, true, type == "rect");
            if (!cur) {
                return;
            }
            if (cmp(cur, lastPos) != 0) {
                ensureFocus(cm);
                extendTo(cur);
                var visible = visibleLines(display, doc);
                if (cur.line >= visible.to || cur.line < visible.from) {
                    setTimeout(operation(cm, function () {
                        if (counter == curCount) {
                            extend(e);
                        }
                    }), 150);
                }
            } else {
                var outside = e.clientY < editorSize.top
                    ? -20
                    : e.clientY > editorSize.bottom
                        ? 20
                        : 0;
                if (outside) {
                    setTimeout(operation(cm, function () {
                        if (counter != curCount) {
                            return;
                        }
                        display.scroller.scrollTop += outside;
                        extend(e);
                    }), 50);
                }
            }
        }

        function done(e) {
            counter = Infinity;
            e_preventDefault(e);
            focusInput(cm);
            off(document, "mousemove", move);
            off(document, "mouseup", up);
            doc.history.lastSelOrigin = null;
        }

        var move = operation(cm, function (e) {
            if (!e_button(e)) {
                done(e);
            } else {
                extend(e);
            }
        });
        var up = operation(cm, done);
        on(document, "mousemove", move);
        on(document, "mouseup", up);
    }

    // Determines whether an event happened in the gutter, and fires the handlers
    // for the corresponding event.
    function gutterEvent(cm, e, type, prevent, signalfn) {
        try {
            var mX = e.clientX,
                mY = e.clientY;
        } catch (e) {
            return false;
        }
        if (mX >= Math.floor(cm.display.gutters.getBoundingClientRect().right)) {
            return false;
        }
        if (prevent) {
            e_preventDefault(e);
        }

        var display = cm.display;
        var lineBox = display
            .lineDiv
            .getBoundingClientRect();

        if (mY > lineBox.bottom || !hasHandler(cm, type)) {
            return e_defaultPrevented(e);
        }
        mY -= lineBox.top - display.viewOffset;

        for (var i = 0; i < cm.options.gutters.length; i += 1) {
            var g = display
                .gutters
                .childNodes[i];
            if (g && g.getBoundingClientRect().right >= mX) {
                var line = lineAtHeight(cm.doc, mY);
                var gutter = cm
                    .options
                    .gutters[i];
                signalfn(cm, type, cm, line, gutter, e);
                return e_defaultPrevented(e);
            }
        }
    }

    function clickInGutter(cm, e) {
        return gutterEvent(cm, e, "gutterClick", true, signalLater);
    }

    // Kludge to work around strange IE behavior where it'll sometimes re-fire a
    // series of drag-related events right after the drop (#1551)
    var lastDrop = 0;

    function onDrop(e) {
        var cm = this;
        if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e)) {
            return;
        }
        e_preventDefault(e);
        if (ie) {
            lastDrop = +new Date;
        }
        var pos   = posFromMouse(cm, e, true),
            files = e.dataTransfer.files;
        if (!pos || isReadOnly(cm)) {
            return;
        }
        // Might be a file drop, in which case we simply extract the text and insert it.
        if (files && files.length && window.FileReader && window.File) {
            var n    = files.length,
                text = Array(n),
                read = 0;
            var loadFile = function (file, i) {
                var reader = new FileReader;
                reader.onload = operation(cm, function () {
                    text[i] = reader.result;
                    if (++read == n) {
                        pos = clipPos(cm.doc, pos);
                        var change = {
                            from  : pos,
                            origin: "paste",
                            text  : splitLines(text.join("\n")),
                            to    : pos
                        };
                        makeChange(cm.doc, change);
                        setSelectionReplaceHistory(cm.doc, simpleSelection(pos, changeEnd(change)));
                    }
                });
                reader.readAsText(file);
            };
            for (var i = 0; i < n; i += 1) {
                loadFile(files[i], i);
            }
        } else { // Normal drop
            // Don't do a replace if the drop happened inside of the selected text.
            if (cm.state.draggingText && cm.doc.sel.contains(pos) > -1) {
                cm
                    .state
                    .draggingText(e);
                // Ensure the editor is re-focused
                setTimeout(bind(focusInput, cm), 20);
                return;
            }
            try {
                var text = e
                    .dataTransfer
                    .getData("Text");
                if (text) {
                    if (cm.state.draggingText && !(mac
                        ? e.metaKey
                        : e.ctrlKey)) {
                        var selected = cm.listSelections();
                    }
                    setSelectionNoUndo(cm.doc, simpleSelection(pos, pos));
                    if (selected) {
                        for (var i = 0; i < selected.length; i += 1) {
                            replaceRange(cm.doc, "", selected[i].anchor, selected[i].head, "drag");
                        }
                    }
                    cm.replaceSelection(text, "around", "paste");
                    focusInput(cm);
                }
            } catch (e) {}
        }
    }

    function onDragStart(cm, e) {
        if (ie && (!cm.state.draggingText || +new Date - lastDrop < 100)) {
            e_stop(e);
            return;
        }
        if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e)) {
            return;
        }

        e
            .dataTransfer
            .setData("Text", cm.getSelection());

        // Use dummy image instead of default browsers image. Recent Safari (~6.0.2)
        // have a tendency to segfault when this happens, so we don't do it there.
        if (e.dataTransfer.setDragImage && !safari) {
            var img = elt("img", null, null, "position: fixed; left: 0; top: 0;");
            img.src = "data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==";
            if (presto) {
                img.width = img.height = 1;
                cm
                    .display
                    .wrapper
                    .appendChild(img);
                // Force a relayout, or Opera won't use our image for some obscure reason
                img._top = img.offsetTop;
            }
            e
                .dataTransfer
                .setDragImage(img, 0, 0);
            if (presto) {
                img
                    .parentNode
                    .removeChild(img);
            }
        }
    }

    // SCROLL EVENTS Sync the scrollable area and scrollbars, ensure the viewport
    // covers the visible area.
    function setScrollTop(cm, val) {
        if (Math.abs(cm.doc.scrollTop - val) < 2) {
            return;
        }
        cm.doc.scrollTop = val;
        if (!gecko) {
            updateDisplaySimple(cm, {top: val});
        }
        if (cm.display.scroller.scrollTop != val) {
            cm.display.scroller.scrollTop = val;
        }
        cm
            .display
            .scrollbars
            .setScrollTop(val);
        if (gecko) {
            updateDisplaySimple(cm);
        }
        startWorker(cm, 100);
    }
    // Sync scroller and scrollbar, ensure the gutter elements are aligned.
    function setScrollLeft(cm, val, isScroller) {
        if (isScroller
            ? val == cm.doc.scrollLeft
            : Math.abs(cm.doc.scrollLeft - val) < 2) {
            return;
        }
        val               = Math.min(val, cm.display.scroller.scrollWidth - cm.display.scroller.clientWidth);
        cm.doc.scrollLeft = val;
        alignHorizontally(cm);
        if (cm.display.scroller.scrollLeft != val) {
            cm.display.scroller.scrollLeft = val;
        }
        cm
            .display
            .scrollbars
            .setScrollLeft(val);
    }

    // Since the delta values reported on mouse wheel events are unstandardized
    // between browsers and even browser versions, and generally horribly
    // unpredictable, this code starts by measuring the scroll effect that the first
    // few mouse wheel events have, and, from that, detects the way it can convert
    // deltas to pixel offsets afterwards.
    //
    // The reason we want to know the amount a wheel event will scroll is that it
    // gives us a chance to update the display before the actual scrolling happens,
    // reducing flickering.

    var wheelSamples       = 0,
        wheelPixelsPerUnit = null;
    // Fill in a browser-detected starting value on browsers where we know one.
    // These don't have to be accurate -- the result of them being wrong would just
    // be a slight flicker on the first wheel scroll (if it is large enough).
    if (ie) {
        wheelPixelsPerUnit = -.53;
    } else if (gecko) {
        wheelPixelsPerUnit = 15;
    } else if (chrome) {
        wheelPixelsPerUnit = -.7;
    } else if (safari) {
        wheelPixelsPerUnit = -1 / 3;
    }

    var wheelEventDelta = function (e) {
        var dx = e.wheelDeltaX,
            dy = e.wheelDeltaY;
        if (dx == null && e.detail && e.axis == e.HORIZONTAL_AXIS) {
            dx = e.detail;
        }
        if (dy == null && e.detail && e.axis == e.VERTICAL_AXIS) {
            dy = e.detail;
        } else if (dy == null) {
            dy = e.wheelDelta;
        }
        return {x: dx, y: dy};
    };
    codeMirror.wheelEventPixels = function (e) {
        var delta = wheelEventDelta(e);
        delta.x *= wheelPixelsPerUnit;
        delta.y *= wheelPixelsPerUnit;
        return delta;
    };

    function onScrollWheel(cm, e) {
        var delta = wheelEventDelta(e),
            dx    = delta.x,
            dy    = delta.y;

        var display = cm.display,
            scroll  = display.scroller;
        // Quit if there's nothing to scroll here
        if (!(dx && scroll.scrollWidth > scroll.clientWidth || dy && scroll.scrollHeight > scroll.clientHeight)) {
            return;
        }

        // Webkit browsers on OS X abort momentum scrolls when the target of the scroll
        // event is removed from the scrollable element. This hack (see related code in
        // patchDisplay) makes sure the element is kept around.
        if (dy && mac && webkit) {
            outer : for (var cur = e.target, view = display.view; cur != scroll; cur = cur.parentNode) {
                for (var i = 0; i < view.length; i += 1) {
                    if (view[i].node == cur) {
                        cm.display.currentWheelTarget = cur;
                        break outer;
                    }
                }
            };
        }

        // On some browsers, horizontal scrolling will cause redraws to happen before
        // the gutter has been realigned, causing it to wriggle around in a most
        // unseemly way. When we have an estimated pixels/delta value, we just handle
        // horizontal scrolling entirely here. It'll be slightly off from native, but
        // better than glitching out.
        if (dx && !gecko && !presto && wheelPixelsPerUnit != null) {
            if (dy) {
                setScrollTop(cm, Math.max(0, Math.min(scroll.scrollTop + dy * wheelPixelsPerUnit, scroll.scrollHeight - scroll.clientHeight)));
            }
            setScrollLeft(cm, Math.max(0, Math.min(scroll.scrollLeft + dx * wheelPixelsPerUnit, scroll.scrollWidth - scroll.clientWidth)));
            e_preventDefault(e);
            display.wheelStartX = null; // Abort measurement, if in progress
            return;
        }

        // 'Project' the visible viewport to cover the area that is being scrolled into
        // view (if we know enough to estimate it).
        if (dy && wheelPixelsPerUnit != null) {
            var pixels = dy * wheelPixelsPerUnit;
            var top = cm.doc.scrollTop,
                bot = top + display.wrapper.clientHeight;
            if (pixels < 0) {
                top = Math.max(0, top + pixels - 50);
            } else {
                bot = Math.min(cm.doc.height, bot + pixels + 50);
            }
            updateDisplaySimple(cm, {
                bottom: bot,
                top   : top
            });
        }

        if (wheelSamples < 20) {
            if (display.wheelStartX == null) {
                display.wheelStartX = scroll.scrollLeft;
                display.wheelStartY = scroll.scrollTop;
                display.wheelDX     = dx;
                display.wheelDY     = dy;
                setTimeout(function () {
                    if (display.wheelStartX == null) {
                        return;
                    }
                    var movedX = scroll.scrollLeft - display.wheelStartX;
                    var movedY = scroll.scrollTop - display.wheelStartY;
                    var sample = (movedY && display.wheelDY && movedY / display.wheelDY) || (movedX && display.wheelDX && movedX / display.wheelDX);
                    display.wheelStartX = display.wheelStartY = null;
                    if (!sample) {
                        return;
                    }
                    wheelPixelsPerUnit = (wheelPixelsPerUnit * wheelSamples + sample) / (wheelSamples +
                            1);
                    wheelSamples       += 1;
                }, 200);
            } else {
                display.wheelDX += dx;
                display.wheelDY += dy;
            }
        }
    }

    // KEY EVENTS Run a handler that was bound to a key.
    function doHandleBinding(cm, bound, dropShift) {
        if (typeof bound == "string") {
            bound = commands[bound];
            if (!bound) {
                return false;
            }
        }
        // Ensure previous input has been read, so that the handler sees a consistent
        // view of the document
        if (cm.display.pollingFast && readInput(cm)) {
            cm.display.pollingFast = false;
        }
        var prevShift = cm.display.shift,
            done      = false;
        try {
            if (isReadOnly(cm)) {
                cm.state.suppressEdits = true;
            }
            if (dropShift) {
                cm.display.shift = false;
            }
            done = bound(cm) != Pass;
        } finally {
            cm.display.shift       = prevShift;
            cm.state.suppressEdits = false;
        }
        return done;
    }

    function lookupKeyForEditor(cm, name, handle) {
        for (var i = 0; i < cm.state.keyMaps.length; i += 1) {
            var result = lookupKey(name, cm.state.keyMaps[i], handle, cm);
            if (result) {
                return result;
            }
        }
        return (cm.options.extraKeys && lookupKey(name, cm.options.extraKeys, handle, cm)) || lookupKey(name, cm.options.keyMap, handle, cm);
    }

    var stopSeq = new Delayed;
    function dispatchKey(cm, name, e, handle) {
        var seq = cm.state.keySeq;
        if (seq) {
            if (isModifierKey(name)) {
                return "handled";
            }
            stopSeq.set(50, function () {
                if (cm.state.keySeq == seq) {
                    cm.state.keySeq = null;
                    resetInput(cm);
                }
            });
            name = seq + " " + name;
        }
        var result = lookupKeyForEditor(cm, name, handle);

        if (result == "multi") {
            cm.state.keySeq = name;
        }
        if (result == "handled") {
            signalLater(cm, "keyHandled", cm, name, e);
        }

        if (result == "handled" || result == "multi") {
            e_preventDefault(e);
            restartBlink(cm);
        }

        if (seq && !result && /\'$/.test(name)) {
            e_preventDefault(e);
            return true;
        }
        return !!result;
    }

    // Handle a key from the keydown event.
    function handleKeyBinding(cm, e) {
        var name = keyName(e, true);
        if (!name) {
            return false;
        }

        if (e.shiftKey && !cm.state.keySeq) {
            // First try to resolve full name (including 'Shift-'). Failing that, see if
            // there is a cursor-motion command (starting with 'go') bound to the keyname
            // without 'Shift-'.
            return dispatchKey(cm, "Shift-" + name, e, function (b) {
                return doHandleBinding(cm, b, true);
            }) || dispatchKey(cm, name, e, function (b) {
                if (typeof b == "string"
                    ? /^go[A-Z]/.test(b)
                    : b.motion) {
                    return doHandleBinding(cm, b);
                }
            });
        } else {
            return dispatchKey(cm, name, e, function (b) {
                return doHandleBinding(cm, b);
            });
        }
    }

    // Handle a key from the keypress event
    function handleCharBinding(cm, e, ch) {
        return dispatchKey(cm, "'" + ch + "'", e, function (b) {
            return doHandleBinding(cm, b, true);
        });
    }

    var lastStoppedKey = null;
    function onKeyDown(e) {
        var cm = this;
        ensureFocus(cm);
        if (signalDOMEvent(cm, e)) {
            return;
        }
        // IE does strange things with escape.
        if (ie && ie_version < 11 && e.keyCode == 27) {
            e.returnValue = false;
        }
        var code = e.keyCode;
        cm.display.shift = code == 16 || e.shiftKey;
        var handled = handleKeyBinding(cm, e);
        if (presto) {
            lastStoppedKey = handled
                ? code
                : null;
            // Opera has no cut event... we try to at least catch the key combo
            if (!handled && code == 88 && !hasCopyEvent && (mac
                ? e.metaKey
                : e.ctrlKey)) {
                cm.replaceSelection("", null, "cut");
            }
        }

        // Turn mouse into crosshair when Alt is held on Mac.
        if (code == 18 && !/\bCodeMirror-crosshair\b/.test(cm.display.lineDiv.className)) {
            showCrossHair(cm);
        }
    }

    function showCrossHair(cm) {
        var lineDiv = cm.display.lineDiv;
        addClass(lineDiv, "CodeMirror-crosshair");

        function up(e) {
            if (e.keyCode == 18 || !e.altKey) {
                rmClass(lineDiv, "CodeMirror-crosshair");
                off(document, "keyup", up);
                off(document, "mouseover", up);
            }
        }
        on(document, "keyup", up);
        on(document, "mouseover", up);
    }

    function onKeyUp(e) {
        if (e.keyCode == 16) {
            this.doc.sel.shift = false;
        }
        signalDOMEvent(this, e);
    }

    function onKeyPress(e) {
        var cm = this;
        if (signalDOMEvent(cm, e) || e.ctrlKey && !e.altKey || mac && e.metaKey) {
            return;
        }
        var keyCode  = e.keyCode,
            charCode = e.charCode;
        if (presto && keyCode == lastStoppedKey) {
            lastStoppedKey = null;
            e_preventDefault(e);
            return;
        }
        if (((presto && (!e.which || e.which < 10)) || khtml) && handleKeyBinding(cm, e)) {
            return;
        }
        var ch = String.fromCharCode(charCode == null
            ? keyCode
            : charCode);
        if (handleCharBinding(cm, e, ch)) {
            return;
        }
        if (ie && ie_version >= 9) {
            cm.display.inputHasSelection = null;
        }
        fastPoll(cm);
    }

    // FOCUS/BLUR EVENTS

    function onFocus(cm) {
        if (cm.options.readOnly == "nocursor") {
            return;
        }
        if (!cm.state.focused) {
            signal(cm, "focus", cm);
            cm.state.focused = true;
            addClass(cm.display.wrapper, "CodeMirror-focused");
            // The prevInput test prevents this from firing when a context menu is closed
            // (since the resetInput would kill the select-all detection hack)
            if (!cm.curOp && cm.display.selForContextMenu != cm.doc.sel) {
                resetInput(cm);
                if (webkit) {
                    setTimeout(bind(resetInput, cm, true), 0); // Issue #1730
                }
            }
        }
        slowPoll(cm);
        restartBlink(cm);
    }
    function onBlur(cm) {
        if (cm.state.focused) {
            signal(cm, "blur", cm);
            cm.state.focused = false;
            rmClass(cm.display.wrapper, "CodeMirror-focused");
        }
        clearInterval(cm.display.blinker);
        setTimeout(function () {
            if (!cm.state.focused) {
                cm.display.shift = false;
            }
        }, 150);
    }

    // CONTEXT MENU HANDLING To make the context menu work, we need to briefly
    // unhide the textarea (making it as unobtrusive as possible) to let the
    // right-click take effect on it.
    function onContextMenu(cm, e) {
        if (signalDOMEvent(cm, e, "contextmenu")) {
            return;
        }
        var display = cm.display;
        if (eventInWidget(display, e) || contextMenuInGutter(cm, e)) {
            return;
        }

        var pos       = posFromMouse(cm, e),
            scrollPos = display.scroller.scrollTop;
        if (!pos || presto) {
            return; // Opera is difficult.
        }

        // Reset the current text selection only if the click is done outside of the
        // selection and 'resetSelectionOnContextMenu' option is true.
        var reset = cm.options.resetSelectionOnContextMenu;
        if (reset && cm.doc.sel.contains(pos) == -1) {
            operation(cm, setSelection)(cm.doc, simpleSelection(pos), sel_dontScroll);
        }

        var oldCSS = display.input.style.cssText;
        display.inputDiv.style.position = "absolute";
        display.input.style.cssText     = "position: fixed; width: 30px; height: 30px; top: " + (e.clientY - 5) + "px; le" +
                "ft: " + (e.clientX - 5) + "px; z-index: 1000; background: " + (ie
            ? "rgba(255, 255, 255, .05)"
            : "transparent") + "; outline: none; border-width: 0; outline: none; overflow: " +
                "hidden; opacity: .05; filter: alpha(opacity=5);";
        if (webkit) {
            var oldScrollY = window.scrollY; // Work around Chrome issue (#2712)
        }
        focusInput(cm);
        if (webkit) {
            window.scrollTo(null, oldScrollY);
        }
        resetInput(cm);
        // Adds "Select all" to context menu in FF
        if (!cm.somethingSelected()) {
            display.input.value = display.prevInput = " ";
        }
        display.contextMenuPending = true;
        display.selForContextMenu  = cm.doc.sel;
        clearTimeout(display.detectingSelectAll);

        // Select-all will be greyed out if there's nothing to select, so this adds a
        // zero-width space so that we can later check whether it got selected.
        function prepareSelectAllHack() {
            if (display.input.selectionStart != null) {
                var selected = cm.somethingSelected();
                var extval = display.input.value = "\u200b" + (selected
                    ? display.input.value
                    : "");
                display.prevInput            = selected
                    ? ""
                    : "\u200b";
                display.input.selectionStart = 1;
                display.input.selectionEnd   = extval.length;
                // Re-set this, in case some other handler touched the selection in the
                // meantime.
                display.selForContextMenu    = cm.doc.sel;
            }
        }
        function rehide() {
            display.contextMenuPending      = false;
            display.inputDiv.style.position = "relative";
            display.input.style.cssText     = oldCSS;
            if (ie && ie_version < 9) {
                display
                    .scrollbars
                    .setScrollTop(display.scroller.scrollTop = scrollPos);
            }
            slowPoll(cm);

            // Try to detect the user choosing select-all
            if (display.input.selectionStart != null) {
                if (!ie || (ie && ie_version < 9)) {
                    prepareSelectAllHack();
                }
                var i    = 0,
                    poll = function () {
                        if (display.selForContextMenu == cm.doc.sel && display.input.selectionStart == 0) {
                            operation(cm, commands.selectAll)(cm);
                        } else if (i++ < 10) {
                            display.detectingSelectAll = setTimeout(poll, 500);
                        } else {
                            resetInput(cm);
                        }
                    };
                display.detectingSelectAll = setTimeout(poll, 200);
            }
        }

        if (ie && ie_version >= 9) {
            prepareSelectAllHack();
        }
        if (captureRightClick) {
            e_stop(e);
            var mouseup = function () {
                off(window, "mouseup", mouseup);
                setTimeout(rehide, 20);
            };
            on(window, "mouseup", mouseup);
        } else {
            setTimeout(rehide, 50);
        }
    }

    function contextMenuInGutter(cm, e) {
        if (!hasHandler(cm, "gutterContextMenu")) {
            return false;
        }
        return gutterEvent(cm, e, "gutterContextMenu", false, signal);
    }

    // UPDATING Compute the position of the end of a change (its 'to' property
    // refers to the pre-change end).
    var changeEnd = codeMirror.changeEnd = function (change) {
        if (!change.text) {
            return change.to;
        }
        return Pos(change.from.line + change.text.length - 1, lst(change.text).length + (change.text.length == 1
            ? change.from.ch
            : 0));
    };

    // Adjust a position to refer to the post-change position of the same text, or
    // the end of the change if the change covers it.
    function adjustForChange(pos, change) {
        if (cmp(pos, change.from) < 0) {
            return pos;
        }
        if (cmp(pos, change.to) <= 0) {
            return changeEnd(change);
        }

        var line = pos.line + change.text.length - (change.to.line - change.from.line) - 1,
            ch   = pos.ch;
        if (pos.line == change.to.line) {
            ch += changeEnd(change).ch - change.to.ch;
        }
        return Pos(line, ch);
    }

    function computeSelAfterChange(doc, change) {
        var out = [];
        for (var i = 0; i < doc.sel.ranges.length; i += 1) {
            var range = doc
                .sel
                .ranges[i];
            out.push(new Range(adjustForChange(range.anchor, change), adjustForChange(range.head, change)));
        }
        return normalizeSelection(out, doc.sel.primIndex);
    }

    function offsetPos(pos, old, nw) {
        if (pos.line == old.line) {
            return Pos(nw.line, pos.ch - old.ch + nw.ch);
        } else {
            return Pos(nw.line + (pos.line - old.line), pos.ch);
        }
    }

    // Used by replaceSelections to allow moving the selection to the start or
    // around the replaced test. Hint may be "start" or "around".
    function computeReplacedSel(doc, changes, hint) {
        var out = [];
        var oldPrev = Pos(doc.first, 0),
            newPrev = oldPrev;
        for (var i = 0; i < changes.length; i += 1) {
            var change = changes[i];
            var from = offsetPos(change.from, oldPrev, newPrev);
            var to = offsetPos(changeEnd(change), oldPrev, newPrev);
            oldPrev = change.to;
            newPrev = to;
            if (hint == "around") {
                var range = doc
                        .sel
                        .ranges[i],
                    inv   = cmp(range.head, range.anchor) < 0;
                out[i] = new Range(inv
                    ? to
                    : from,
                inv
                    ? from
                    : to);
            } else {
                out[i] = new Range(from, from);
            }
        }
        return new Selection(out, doc.sel.primIndex);
    }

    // Allow "beforeChange" event handlers to influence a change
    function filterChange(doc, change, update) {
        var obj = {
            cancel  : function () {
                this.canceled = true;
            },
            canceled: false,
            from    : change.from,
            origin  : change.origin,
            text    : change.text,
            to      : change.to
        };
        if (update) {
            obj.update = function (from, to, text, origin) {
                if (from) {
                    this.from = clipPos(doc, from);
                }
                if (to) {
                    this.to = clipPos(doc, to);
                }
                if (text) {
                    this.text = text;
                }
                if (origin !== undefined) {
                    this.origin = origin;
                };
            }
            signal(doc, "beforeChange", doc, obj);
        }
        if (doc.cm) {
            signal(doc.cm, "beforeChange", doc.cm, obj);
        }

        if (obj.canceled) {
            return null;
        }
        return {from: obj.from, origin: obj.origin, text: obj.text, to: obj.to};
    }

    // Apply a change to a document, and add it to the document's history, and
    // propagating it to all linked documents.
    function makeChange(doc, change, ignoreReadOnly) {
        if (doc.cm) {
            if (!doc.cm.curOp) {
                return operation(doc.cm, makeChange)(doc, change, ignoreReadOnly);
            }
            if (doc.cm.state.suppressEdits) {
                return;
            }
        }

        if (hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange")) {
            change = filterChange(doc, change, true);
            if (!change) {
                return;
            }
        }

        // Possibly split or suppress the update based on the presence of read-only
        // spans in its range.
        var split = sawReadOnlySpans && !ignoreReadOnly && removeReadOnlyRanges(doc, change.from, change.to);
        if (split) {
            for (var i = split.length - 1; i >= 0; i -= 1) {
                makeChangeInner(doc, {
                    from: split[i].from,
                    text: i
                        ? [""]
                        : change.text,
                    to  : split[i].to
                });
            }
        } else {
            makeChangeInner(doc, change);
        }
    }

    function makeChangeInner(doc, change) {
        if (change.text.length == 1 && change.text[0] == "" && cmp(change.from, change.to) == 0) {
            return;
        }
        var selAfter = computeSelAfterChange(doc, change);
        addChangeToHistory(doc, change, selAfter, doc.cm
            ? doc.cm.curOp.id
            : NaN);

        makeChangeSingleDoc(doc, change, selAfter, stretchSpansOverChange(doc, change));
        var rebased = [];

        linkedDocs(doc, function (doc, sharedHist) {
            if (!sharedHist && indexOf(rebased, doc.history) == -1) {
                rebaseHist(doc.history, change);
                rebased.push(doc.history);
            }
            makeChangeSingleDoc(doc, change, null, stretchSpansOverChange(doc, change));
        });
    }

    // Revert a change stored in a document's history.
    function makeChangeFromHistory(doc, type, allowSelectionOnly) {
        if (doc.cm && doc.cm.state.suppressEdits) {
            return;
        }

        var hist     = doc.history,
            event,
            selAfter = doc.sel;
        var source = type == "undo"
                ? hist.done
                : hist.undone,
            dest   = type == "undo"
                ? hist.undone
                : hist.done;

        // Verify that there is a useable event (so that ctrl-z won't needlessly clear
        // selection events)
        for (var i = 0; i < source.length; i += 1) {
            event = source[i];
            if (allowSelectionOnly
                ? event.ranges && !event.equals(doc.sel)
                : !event.ranges) {
                break;
            }
        }
        if (i == source.length) {
            return;
        }
        hist.lastOrigin = hist.lastSelOrigin = null;

        for (;;) {
            event = source.pop();
            if (event.ranges) {
                pushSelectionToHistory(event, dest);
                if (allowSelectionOnly && !event.equals(doc.sel)) {
                    setSelection(doc, event, {clearRedo: false});
                    return;
                }
                selAfter = event;
            } else {
                break;
            }
        }

        // Build up a reverse change object to add to the opposite history stack (redo
        // when undoing, and vice versa).
        var antiChanges = [];
        pushSelectionToHistory(selAfter, dest);
        dest.push({changes: antiChanges, generation: hist.generation});
        hist.generation = event.generation || ++hist.maxGeneration;

        var filter = hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange");

        for (var i = event.changes.length - 1; i >= 0; i -= 1) {
            var change = event.changes[i];
            change.origin = type;
            if (filter && !filterChange(doc, change, false)) {
                source.length = 0;
                return;
            }

            antiChanges.push(historyChangeFromChange(doc, change));

            var after = i
                ? computeSelAfterChange(doc, change)
                : lst(source);
            makeChangeSingleDoc(doc, change, after, mergeOldSpans(doc, change));
            if (!i && doc.cm) {
                doc
                    .cm
                    .scrollIntoView({from: change.from, to: changeEnd(change)});
            }
            var rebased = [];

            // Propagate to the linked documents
            linkedDocs(doc, function (doc, sharedHist) {
                if (!sharedHist && indexOf(rebased, doc.history) == -1) {
                    rebaseHist(doc.history, change);
                    rebased.push(doc.history);
                }
                makeChangeSingleDoc(doc, change, null, mergeOldSpans(doc, change));
            });
        }
    }

    // Sub-views need their line numbers shifted when text is added above or below
    // them in the parent document.
    function shiftDoc(doc, distance) {
        if (distance == 0) {
            return;
        }
        doc.first += distance;
        doc.sel   = new Selection(map(doc.sel.ranges, function (range) {
            return new Range(Pos(range.anchor.line + distance, range.anchor.ch), Pos(range.head.line +
                    distance, range.head.ch));
        }), doc.sel.primIndex);
        if (doc.cm) {
            regChange(doc.cm, doc.first, doc.first - distance, distance);
            for (var d = doc.cm.display, l = d.viewFrom; l < d.viewTo; l += 1) {
                regLineChange(doc.cm, l, "gutter");
            }
        }
    }

    // More lower-level change function, handling only a single document (not linked
    // ones).
    function makeChangeSingleDoc(doc, change, selAfter, spans) {
        if (doc.cm && !doc.cm.curOp) {
            return operation(doc.cm, makeChangeSingleDoc)(doc, change, selAfter, spans);
        }

        if (change.to.line < doc.first) {
            shiftDoc(doc, change.text.length - 1 - (change.to.line - change.from.line));
            return;
        }
        if (change.from.line > doc.lastLine()) {
            return;
        }

        // Clip the change to the size of this doc
        if (change.from.line < doc.first) {
            var shift = change.text.length - 1 - (doc.first - change.from.line);
            shiftDoc(doc, shift);
            change = {
                from  : Pos(doc.first, 0),
                origin: change.origin,
                text  : [lst(change.text)],
                to    : Pos(change.to.line + shift, change.to.ch)
            };
        }
        var last = doc.lastLine();
        if (change.to.line > last) {
            change = {
                from  : change.from,
                origin: change.origin,
                text  : [change.text[0]],
                to    : Pos(last, getLine(doc, last).text.length)
            };
        }

        change.removed = getBetween(doc, change.from, change.to);

        if (!selAfter) {
            selAfter = computeSelAfterChange(doc, change);
        }
        if (doc.cm) {
            makeChangeSingleDocInEditor(doc.cm, change, spans);
        } else {
            updateDoc(doc, change, spans);
        }
        setSelectionNoUndo(doc, selAfter, sel_dontScroll);
    }

    // Handle the interaction of a change to a document with the editor that this
    // document is part of.
    function makeChangeSingleDocInEditor(cm, change, spans) {
        var doc     = cm.doc,
            display = cm.display,
            from    = change.from,
            to      = change.to;

        var recomputeMaxLength = false,
            checkWidthStart    = from.line;
        if (!cm.options.lineWrapping) {
            checkWidthStart = lineNo(visualLine(getLine(doc, from.line)));
            doc.iter(checkWidthStart, to.line + 1, function (line) {
                if (line == display.maxLine) {
                    recomputeMaxLength = true;
                    return true;
                }
            });
        }

        if (doc.sel.contains(change.from, change.to) > -1) {
            signalCursorActivity(cm);
        }

        updateDoc(doc, change, spans, estimateHeight(cm));

        if (!cm.options.lineWrapping) {
            doc.iter(checkWidthStart, from.line + change.text.length, function (line) {
                var len = lineLength(line);
                if (len > display.maxLineLength) {
                    display.maxLine        = line;
                    display.maxLineLength  = len;
                    display.maxLineChanged = true;
                    recomputeMaxLength     = false;
                }
            });
            if (recomputeMaxLength) {
                cm.curOp.updateMaxLine = true;
            }
        }

        // Adjust frontier, schedule worker
        doc.frontier = Math.min(doc.frontier, from.line);
        startWorker(cm, 400);

        var lendiff = change.text.length - (to.line - from.line) - 1;
        // Remember that these lines changed, for updating the display
        if (change.full) {
            regChange(cm);
        } else if (from.line == to.line && change.text.length == 1 && !isWholeLineUpdate(cm.doc, change)) {
            regLineChange(cm, from.line, "text");
        } else {
            regChange(cm, from.line, to.line + 1, lendiff);
        }

        var changesHandler = hasHandler(cm, "changes"),
            changeHandler  = hasHandler(cm, "change");
        if (changeHandler || changesHandler) {
            var obj = {
                from   : from,
                origin : change.origin,
                removed: change.removed,
                text   : change.text,
                to     : to
            };
            if (changeHandler) {
                signalLater(cm, "change", cm, obj);
            }
            if (changesHandler) {
                (cm.curOp.changeObjs || (cm.curOp.changeObjs = [])).push(obj);
            }
        }
        cm.display.selForContextMenu = null;
    }

    function replaceRange(doc, code, from, to, origin) {
        if (!to) {
            to = from;
        }
        if (cmp(to, from) < 0) {
            var tmp = to;
            to   = from;
            from = tmp;
        }
        if (typeof code == "string") {
            code = splitLines(code);
        }
        makeChange(doc, {
            from  : from,
            origin: origin,
            text  : code,
            to    : to
        });
    }

    // SCROLLING THINGS INTO VIEW If an editor sits on the top or bottom of the
    // window, partially scrolled out of view, this ensures that the cursor is
    // visible.
    function maybeScrollWindow(cm, coords) {
        if (signalDOMEvent(cm, "scrollCursorIntoView")) {
            return;
        }

        var display  = cm.display,
            box      = display
                .sizer
                .getBoundingClientRect(),
            doScroll = null;
        if (coords.top + box.top < 0) {
            doScroll = true;
        } else if (coords.bottom + box.top > (window.innerHeight || document.documentElement.clientHeight)) {
            doScroll = false;
        }
        if (doScroll != null && !phantom) {
            var scrollNode = elt("div", "\u200b", null, "position: absolute; top: " + (coords.top - display.viewOffset - paddingTop(cm.display)) +
                    "px; height: " + (coords.bottom - coords.top + scrollGap(cm) + display.barHeight) +
                    "px; left: " + coords.left + "px; width: 2px;");
            cm
                .display
                .lineSpace
                .appendChild(scrollNode);
            scrollNode.scrollIntoView(doScroll);
            cm
                .display
                .lineSpace
                .removeChild(scrollNode);
        }
    }

    // Scroll a given position into view (immediately), verifying that it actually
    // became visible (as line heights are accurately measured, the position of
    // something may 'drift' during drawing).
    function scrollPosIntoView(cm, pos, end, margin) {
        if (margin == null) {
            margin = 0;
        }
        for (var limit = 0; limit < 5; limit += 1) {
            var changed = false,
                coords  = cursorCoords(cm, pos);
            var endCoords = !end || end == pos
                ? coords
                : cursorCoords(cm, end);
            var scrollPos = calculateScrollPos(cm, Math.min(coords.left, endCoords.left), Math.min(coords.top, endCoords.top) - margin, Math.max(coords.left, endCoords.left), Math.max(coords.bottom, endCoords.bottom) +
                    margin);
            var startTop  = cm.doc.scrollTop,
                startLeft = cm.doc.scrollLeft;
            if (scrollPos.scrollTop != null) {
                setScrollTop(cm, scrollPos.scrollTop);
                if (Math.abs(cm.doc.scrollTop - startTop) > 1) {
                    changed = true;
                }
            }
            if (scrollPos.scrollLeft != null) {
                setScrollLeft(cm, scrollPos.scrollLeft);
                if (Math.abs(cm.doc.scrollLeft - startLeft) > 1) {
                    changed = true;
                }
            }
            if (!changed) {
                break;
            }
        }
        return coords;
    }

    // Scroll a given set of coordinates into view (immediately).
    function scrollIntoView(cm, x1, y1, x2, y2) {
        var scrollPos = calculateScrollPos(cm, x1, y1, x2, y2);
        if (scrollPos.scrollTop != null) {
            setScrollTop(cm, scrollPos.scrollTop);
        }
        if (scrollPos.scrollLeft != null) {
            setScrollLeft(cm, scrollPos.scrollLeft);
        }
    }

    // Calculate a new scroll position needed to scroll the given rectangle into
    // view. Returns an object with scrollTop and scrollLeft properties. When these
    // are undefined, the vertical/horizontal position does not need to be adjusted.
    function calculateScrollPos(cm, x1, y1, x2, y2) {
        var display    = cm.display,
            snapMargin = textHeight(cm.display);
        if (y1 < 0) {
            y1 = 0;
        }
        var screentop = cm.curOp && cm.curOp.scrollTop != null
            ? cm.curOp.scrollTop
            : display.scroller.scrollTop;
        var screen = displayHeight(cm),
            result = {};
        if (y2 - y1 > screen) {
            y2 = y1 + screen;
        }
        var docBottom = cm.doc.height + paddingVert(display);
        var atTop    = y1 < snapMargin,
            atBottom = y2 > docBottom - snapMargin;
        if (y1 < screentop) {
            result.scrollTop = atTop
                ? 0
                : y1;
        } else if (y2 > screentop + screen) {
            var newTop = Math.min(y1, (atBottom
                ? docBottom
                : y2) - screen);
            if (newTop != screentop) {
                result.scrollTop = newTop;
            }
        }

        var screenleft = cm.curOp && cm.curOp.scrollLeft != null
            ? cm.curOp.scrollLeft
            : display.scroller.scrollLeft;
        var screenw = displayWidth(cm) - (cm.options.fixedGutter
            ? display.gutters.offsetWidth
            : 0);
        var tooWide = x2 - x1 > screenw;
        if (tooWide) {
            x2 = x1 + screenw;
        }
        if (x1 < 10) {
            result.scrollLeft = 0;
        } else if (x1 < screenleft) {
            result.scrollLeft = Math.max(0, x1 - (tooWide
                ? 0
                : 10));
        } else if (x2 > screenw + screenleft - 3) {
            result.scrollLeft = x2 + (tooWide
                ? 0
                : 10) - screenw;
        }
        return result;
    }

    // Store a relative adjustment to the scroll position in the current operation
    // (to be applied when the operation finishes).
    function addToScrollPos(cm, left, top) {
        if (left != null || top != null) {
            resolveScrollToPos(cm);
        }
        if (left != null) {
            cm.curOp.scrollLeft = (cm.curOp.scrollLeft == null
                ? cm.doc.scrollLeft
                : cm.curOp.scrollLeft) + left;
        }
        if (top != null) {
            cm.curOp.scrollTop = (cm.curOp.scrollTop == null
                ? cm.doc.scrollTop
                : cm.curOp.scrollTop) + top;
        }
    }

    // Make sure that at the end of the operation the current cursor is shown.
    function ensureCursorVisible(cm) {
        resolveScrollToPos(cm);
        var cur  = cm.getCursor(),
            from = cur,
            to   = cur;
        if (!cm.options.lineWrapping) {
            from = cur.ch
                ? Pos(cur.line, cur.ch - 1)
                : cur;
            to   = Pos(cur.line, cur.ch + 1);
        }
        cm.curOp.scrollToPos = {
            from    : from,
            isCursor: true,
            margin  : cm.options.cursorScrollMargin,
            to      : to
        };
    }

    // When an operation has its scrollToPos property set, and another scroll action
    // is applied before the end of the operation, this 'simulates' scrolling that
    // position into view in a cheap way, so that the effect of intermediate scroll
    // commands is not ignored.
    function resolveScrollToPos(cm) {
        var range = cm.curOp.scrollToPos;
        if (range) {
            cm.curOp.scrollToPos = null;
            var from = estimateCoords(cm, range.from),
                to   = estimateCoords(cm, range.to);
            var sPos = calculateScrollPos(cm, Math.min(from.left, to.left), Math.min(from.top, to.top) - range.margin, Math.max(from.right, to.right), Math.max(from.bottom, to.bottom) +
                    range.margin);
            cm.scrollTo(sPos.scrollLeft, sPos.scrollTop);
        }
    }

    // API UTILITIES Indent the given line. The how parameter can be "smart",
    // "add"/null, "subtract", or "prev". When aggressive is false (typically set to
    // true for forced single-line indents), empty lines are not indented, and
    // places where the mode returns Pass are left alone.
    function indentLine(cm, n, how, aggressive) {
        var doc = cm.doc,
            state;
        if (how == null) {
            how = "add";
        }
        if (how == "smart") {
            // Fall back to "prev" when the mode doesn't have an indentation method.
            if (!doc.mode.indent) {
                how = "prev";
            } else {
                state = getStateBefore(cm, n);
            }
        }

        var tabSize = cm.options.tabSize;
        var line     = getLine(doc, n),
            curSpace = countColumn(line.text, null, tabSize);
        if (line.stateAfter) {
            line.stateAfter = null;
        }
        var curSpaceString = line
                .text
                .match(/^\s*/)[0],
            indentation;
        if (!aggressive && !/\S/.test(line.text)) {
            indentation = 0;
            how         = "not";
        } else if (how == "smart") {
            indentation = doc
                .mode
                .indent(state, line.text.slice(curSpaceString.length), line.text);
            if (indentation == Pass || indentation > 150) {
                if (!aggressive) {
                    return;
                }
                how = "prev";
            }
        }
        if (how == "prev") {
            if (n > doc.first) {
                indentation = countColumn(getLine(doc, n - 1).text, null, tabSize);
            } else {
                indentation = 0;
            }
        } else if (how == "add") {
            indentation = curSpace + cm.options.indentUnit;
        } else if (how == "subtract") {
            indentation = curSpace - cm.options.indentUnit;
        } else if (typeof how == "number") {
            indentation = curSpace + how;
        }
        indentation = Math.max(0, indentation);

        var indentString = "",
            pos          = 0;
        if (cm.options.indentWithTabs) {
            for (var i = Math.floor(indentation / tabSize); i; i -= 1) {
                pos          += tabSize;
                indentString += "\t";
            }
        }
        if (pos < indentation) {
            indentString += spaceStr(indentation - pos);
        }

        if (indentString != curSpaceString) {
            replaceRange(doc, indentString, Pos(n, 0), Pos(n, curSpaceString.length), "+input");
        } else {
            // Ensure that, if the cursor was in the whitespace at the start of the line, it
            // is moved to the end of that space.
            for (var i = 0; i < doc.sel.ranges.length; i += 1) {
                var range = doc
                    .sel
                    .ranges[i];
                if (range.head.line == n && range.head.ch < curSpaceString.length) {
                    var pos = Pos(n, curSpaceString.length);
                    replaceOneSelection(doc, i, new Range(pos, pos));
                    break;
                }
            }
        }
        line.stateAfter = null;
    }

    // Utility for applying a change to a line by handle or number, returning the
    // number and optionally registering the line as changed.
    function changeLine(doc, handle, changeType, op) {
        var no   = handle,
            line = handle;
        if (typeof handle == "number") {
            line = getLine(doc, clipLine(doc, handle));
        } else {
            no = lineNo(handle);
        }
        if (no == null) {
            return null;
        }
        if (op(line, no) && doc.cm) {
            regLineChange(doc.cm, no, changeType);
        }
        return line;
    }

    // Helper for deleting text near the selection(s), used to implement backspace,
    // delete, and similar functionality.
    function deleteNearSelection(cm, compute) {
        var ranges = cm.doc.sel.ranges,
            kill   = [];
        // Build up a set of ranges to kill first, merging overlapping ranges.
        for (var i = 0; i < ranges.length; i += 1) {
            var toKill = compute(ranges[i]);
            while (kill.length && cmp(toKill.from, lst(kill).to) <= 0) {
                var replaced = kill.pop();
                if (cmp(replaced.from, toKill.from) < 0) {
                    toKill.from = replaced.from;
                    break;
                }
            }
            kill.push(toKill);
        }
        // Next, remove those actual ranges.
        runInOp(cm, function () {
            for (var i = kill.length - 1; i >= 0; i -= 1) {
                replaceRange(cm.doc, "", kill[i].from, kill[i].to, "+delete");
            }
            ensureCursorVisible(cm);
        });
    }

    // Used for horizontal relative motion. Dir is -1 or 1 (left or right), unit can
    // be "char", "column" (like char, but doesn't cross line boundaries), "word"
    // (across next word), or "group" (to the start of next group of word or
    // non-word-non-whitespace chars). The visually param controls whether, in
    // right-to-left text, direction 1 means to move towards the next index in the
    // string, or towards the character to the right of the current position. The
    // resulting position will have a hitSide=true property if it reached the end of
    // the document.
    function findPosH(doc, pos, dir, unit, visually) {
        var line    = pos.line,
            ch      = pos.ch,
            origDir = dir;
        var lineObj = getLine(doc, line);
        var possible = true;
        function findNextLine() {
            var l = line + dir;
            if (l < doc.first || l >= doc.first + doc.size) {
                return (possible = false);
            }
            line           = l;
            return lineObj = getLine(doc, l);
        }
        function moveOnce(boundToLine) {
            var next = (visually
                ? moveVisually
                : moveLogically)(lineObj, ch, dir, true);
            if (next == null) {
                if (!boundToLine && findNextLine()) {
                    if (visually) {
                        ch = (dir < 0
                            ? lineRight
                            : lineLeft)(lineObj);
                    } else {
                        ch = dir < 0
                            ? lineObj.text.length
                            : 0;
                    }
                } else {
                    return (possible = false);
                }
            } else {
                ch = next;
            }
            return true;
        }

        if (unit == "char") {
            moveOnce();
        } else if (unit == "column") {
            moveOnce(true);
        } else if (unit == "word" || unit == "group") {
            var sawType = null,
                group   = unit == "group";
            var helper = doc.cm && doc
                .cm
                .getHelper(pos, "wordChars");
            for (var first = true;; first = false) {
                if (dir < 0 && !moveOnce(!first)) {
                    break;
                }
                var cur = lineObj
                    .text
                    .charAt(ch) || "\n";
                var type = isWordChar(cur, helper)
                    ? "w"
                    : group && cur == "\n"
                        ? "n"
                        : !group || /\s/.test(cur)
                            ? null
                            : "p";
                if (group && !first && !type) {
                    type = "s";
                }
                if (sawType && sawType != type) {
                    if (dir < 0) {
                        dir = 1;
                        moveOnce();
                    }
                    break;
                }

                if (type) {
                    sawType = type;
                }
                if (dir > 0 && !moveOnce(!first)) {
                    break;
                }
            }
        }
        var result = skipAtomic(doc, Pos(line, ch), origDir, true);
        if (!possible) {
            result.hitSide = true;
        }
        return result;
    }

    // For relative vertical movement. Dir may be -1 or 1. Unit can be "page" or
    // "line". The resulting position will have a hitSide=true property if it
    // reached the end of the document.
    function findPosV(cm, pos, dir, unit) {
        var doc = cm.doc,
            x   = pos.left,
            y;
        if (unit == "page") {
            var pageSize = Math.min(cm.display.wrapper.clientHeight, window.innerHeight || document.documentElement.clientHeight);
            y = pos.top + dir * (pageSize - (dir < 0
                ? 1.5
                : .5) * textHeight(cm.display));
        } else if (unit == "line") {
            y = dir > 0
                ? pos.bottom + 3
                : pos.top - 3;
        }
        for (;;) {
            var target = coordsChar(cm, x, y);
            if (!target.outside) {
                break;
            }
            if (dir < 0
                ? y <= 0
                : y >= doc.height) {
                target.hitSide = true;
                break;
            }
            y += dir * 5;
        }
        return target;
    }

    // EDITOR METHODS The publicly visible API. Note that methodOp(f) means 'wrap f
    // in an operation, performed on its `this` parameter'. This is not the complete
    // set of editor methods. Most of the methods defined on the Doc type are also
    // injected into CodeMirror.prototype, for backwards compatibility and
    // convenience.

    codeMirror.prototype = {
        addKeyMap         : function (map, bottom) {
            this
                .state
                .keyMaps[
                    bottom
                        ? "push"
                        : "unshift"
                ](getKeyMap(map));
        },

        addLineWidget     : methodOp(function (handle, node, options) {
            return addLineWidget(this, handle, node, options);
        }),

        addOverlay        : methodOp(function (spec, options) {
            var mode = spec.token
                ? spec
                : codeMirror.getMode(this.options, spec);
            if (mode.startState) {
                throw new Error("Overlays may not be stateful.");
            }
            this
                .state
                .overlays
                .push({
                    mode    : mode,
                    modeSpec: spec,
                    opaque  : options && options.opaque
                });
            this.state.modeGen += 1;
            regChange(this);
        }),

        addWidget         : function (pos, node, scroll, vert, horiz) {
            var display = this.display;
            pos = cursorCoords(this, clipPos(this.doc, pos));
            var top  = pos.bottom,
                left = pos.left;
            node.style.position = "absolute";
            node.setAttribute("cm-ignore-events", "true");
            display
                .sizer
                .appendChild(node);
            if (vert == "over") {
                top = pos.top;
            } else if (vert == "above" || vert == "near") {
                var vspace = Math.max(display.wrapper.clientHeight, this.doc.height),
                    hspace = Math.max(display.sizer.clientWidth, display.lineSpace.clientWidth);
                // Default to positioning above (if specified and possible); otherwise default
                // to positioning below
                if ((vert == "above" || pos.bottom + node.offsetHeight > vspace) && pos.top > node.offsetHeight) {
                    top = pos.top - node.offsetHeight;
                } else if (pos.bottom + node.offsetHeight <= vspace) {
                    top = pos.bottom;
                }
                if (left + node.offsetWidth > hspace) {
                    left = hspace - node.offsetWidth;
                }
            }
            node.style.top  = top + "px";
            node.style.left = node.style.right = "";
            if (horiz == "right") {
                left             = display.sizer.clientWidth - node.offsetWidth;
                node.style.right = "0px";
            } else {
                if (horiz == "left") {
                    left = 0;
                } else if (horiz == "middle") {
                    left = (display.sizer.clientWidth - node.offsetWidth) / 2;
                }
                node.style.left = left + "px";
            }
            if (scroll) {
                scrollIntoView(this, left, top, left + node.offsetWidth, top + node.offsetHeight);
            }
        },

        charCoords        : function (pos, mode) {
            return charCoords(this, clipPos(this.doc, pos), mode || "page");
        },

        clearGutter       : methodOp(function (gutterID) {
            var cm  = this,
                doc = cm.doc,
                i   = doc.first;
            doc.iter(function (line) {
                if (line.gutterMarkers && line.gutterMarkers[gutterID]) {
                    line.gutterMarkers[gutterID] = null;
                    regLineChange(cm, i, "gutter");
                    if (isEmpty(line.gutterMarkers)) {
                        line.gutterMarkers = null;
                    }
                }
                ++i;
            });
        }),
        constructor       : codeMirror,

        coordsChar        : function (coords, mode) {
            coords = fromCoordSystem(this, coords, mode || "page");
            return coordsChar(this, coords.left, coords.top);
        },

        cursorCoords      : function (start, mode) {
            var pos,
                range = this
                    .doc
                    .sel
                    .primary();
            if (start == null) {
                pos = range.head;
            } else if (typeof start == "object") {
                pos = clipPos(this.doc, start);
            } else {
                pos = start
                    ? range.from()
                    : range.to();
            }
            return cursorCoords(this, pos, mode || "page");
        },
        defaultCharWidth  : function () {
            return charWidth(this.display);
        },

        defaultTextHeight : function () {
            return textHeight(this.display);
        },

        deleteH           : methodOp(function (dir, unit) {
            var sel = this.doc.sel,
                doc = this.doc;
            if (sel.somethingSelected()) {
                doc.replaceSelection("", null, "+delete");
            } else {
                deleteNearSelection(this, function (range) {
                    var other = findPosH(doc, range.head, dir, unit, false);
                    return dir < 0
                        ? {
                            from: other,
                            to  : range.head
                        }
                        : {
                            from: range.head,
                            to  : other
                        };
                });
            }
        }),

        execCommand       : function (cmd) {
            if (commands.hasOwnProperty(cmd)) {
                return commands[cmd](this);
            }
        },

        findPosH          : function (from, amount, unit, visually) {
            var dir = 1;
            if (amount < 0) {
                dir    = -1;
                amount = -amount;
            }
            for (var i = 0, cur = clipPos(this.doc, from); i < amount; i += 1) {
                cur = findPosH(this.doc, cur, dir, unit, visually);
                if (cur.hitSide) {
                    break;
                }
            }
            return cur;
        },

        findPosV          : function (from, amount, unit, goalColumn) {
            var dir = 1,
                x   = goalColumn;
            if (amount < 0) {
                dir    = -1;
                amount = -amount;
            }
            for (var i = 0, cur = clipPos(this.doc, from); i < amount; i += 1) {
                var coords = cursorCoords(this, cur, "div");
                if (x == null) {
                    x = coords.left;
                } else {
                    coords.left = x;
                }
                cur = findPosV(this, coords, dir, unit);
                if (cur.hitSide) {
                    break;
                }
            }
            return cur;
        },

        // Find the word at the given position (as returned by coordsChar).
        findWordAt        : function (pos) {
            var doc  = this.doc,
                line = getLine(doc, pos.line).text;
            var start = pos.ch,
                end   = pos.ch;
            if (line) {
                var helper = this.getHelper(pos, "wordChars");
                if ((pos.xRel < 0 || end == line.length) && start) {
                    --start;
                } else {
                    ++end;
                }
                var startChar = line.charAt(start);
                var check = isWordChar(startChar, helper)
                    ? function (ch) {
                        return isWordChar(ch, helper);
                    }
                    : /\s/.test(startChar)
                        ? function (ch) {
                            return /\s/.test(ch);
                        }
                        : function (ch) {
                            return !/\s/.test(ch) && !isWordChar(ch);
                        };
                while (start > 0 && check(line.charAt(start - 1))) {
                    --start;
                }
                while (end < line.length && check(line.charAt(end))) {
                    ++end;
                }
            }
            return new Range(Pos(pos.line, start), Pos(pos.line, end));
        },
        focus             : function () {
            window.focus();
            focusInput(this);
            fastPoll(this);
        },
        getDoc            : function () {
            return this.doc;
        },
        getGutterElement  : function () {
            return this.display.gutters;
        },

        getHelper         : function (pos, type) {
            return this.getHelpers(pos, type)[0];
        },

        getHelpers        : function (pos, type) {
            var found = [];
            if (!helpers.hasOwnProperty(type)) {
                return helpers;
            }
            var help = helpers[type],
                mode = this.getModeAt(pos);
            if (typeof mode[type] == "string") {
                if (help[mode[type]]) {
                    found.push(help[mode[type]]);
                }
            } else if (mode[type]) {
                for (var i = 0; i < mode[type].length; i += 1) {
                    var val = help[mode[type][i]];
                    if (val) {
                        found.push(val);
                    }
                }
            } else if (mode.helperType && help[mode.helperType]) {
                found.push(help[mode.helperType]);
            } else if (help[mode.name]) {
                found.push(help[mode.name]);
            }
            for (var i = 0; i < help._global.length; i += 1) {
                var cur = help._global[i];
                if (cur.pred(mode, this) && indexOf(found, cur.val) == -1) {
                    found.push(cur.val);
                }
            }
            return found;
        },

        getInputField     : function () {
            return this.display.input;
        },

        getLineTokens     : function (line, precise) {
            return takeToken(this, Pos(line), precise, true);
        },

        getModeAt         : function (pos) {
            var mode = this.doc.mode;
            if (!mode.innerMode) {
                return mode;
            }
            return codeMirror
                .innerMode(mode, this.getTokenAt(pos).state)
                .mode;
        },

        getOption         : function (option) {
            return this.options[option];
        },
        getScrollerElement: function () {
            return this.display.scroller;
        },
        getScrollInfo     : function () {
            var scroller = this.display.scroller;
            return {
                clientHeight: displayHeight(this),
                clientWidth : displayWidth(this),
                height      : scroller.scrollHeight - scrollGap(this) - this.display.barHeight,
                left        : scroller.scrollLeft,
                top         : scroller.scrollTop,
                width       : scroller.scrollWidth - scrollGap(this) - this.display.barWidth
            };
        },

        getStateAfter     : function (line, precise) {
            var doc = this.doc;
            line = clipLine(doc, line == null
                ? doc.first + doc.size - 1
                : line);
            return getStateBefore(this, line + 1, precise);
        },

        // Fetch the parser token for a given character. Useful for hacks that want to
        // inspect the mode state (say, for completion).
        getTokenAt        : function (pos, precise) {
            return takeToken(this, pos, precise);
        },

        getTokenTypeAt    : function (pos) {
            pos = clipPos(this.doc, pos);
            var styles = getLineStyles(this, getLine(this.doc, pos.line));
            var before = 0,
                after  = (styles.length - 1) / 2,
                ch     = pos.ch;
            var type;
            if (ch == 0) {
                type = styles[2];
            } else {
                for (;;) {
                    var mid = (before + after) >> 1;
                    if ((mid
                        ? styles[mid * 2 - 1]
                        : 0) >= ch) {
                        after = mid;
                    } else if (styles[mid * 2 + 1] < ch) {
                        before = mid + 1;
                    } else {
                        type = styles[mid * 2 + 2];
                        break;
                    }
                }
            }
            var cut = type
                ? type.indexOf("cm-overlay ")
                : -1;
            return cut < 0
                ? type
                : cut == 0
                    ? null
                    : type.slice(0, cut - 1);
        },

        getViewport       : function () {
            return {from: this.display.viewFrom, to: this.display.viewTo};
        },
        getWrapperElement : function () {
            return this.display.wrapper;
        },
        hasFocus          : function () {
            return activeElt() == this.display.input;
        },
        heightAtLine      : function (line, mode) {
            var end  = false,
                last = this.doc.first + this.doc.size - 1;
            if (line < this.doc.first) {
                line = this.doc.first;
            } else if (line > last) {
                line = last;
                end  = true;
            }
            var lineObj = getLine(this.doc, line);
            return intoCoordSystem(this, lineObj, {
                left: 0,
                top : 0
            }, mode || "page").top + (end
                ? this.doc.height - heightAtLine(lineObj)
                : 0);
        },

        indentLine        : methodOp(function (n, dir, aggressive) {
            if (typeof dir != "string" && typeof dir != "number") {
                if (dir == null) {
                    dir = this.options.smartIndent
                        ? "smart"
                        : "prev";
                } else {
                    dir = dir
                        ? "add"
                        : "subtract";
                }
            }
            if (isLine(this.doc, n)) {
                indentLine(this, n, dir, aggressive);
            }
        }),
        indentSelection   : methodOp(function (how) {
            var ranges = this.doc.sel.ranges,
                end    = -1;
            for (var i = 0; i < ranges.length; i += 1) {
                var range = ranges[i];
                if (!range.empty()) {
                    var from = range.from(),
                        to   = range.to();
                    var start = Math.max(end, from.line);
                    end = Math.min(this.lastLine(), to.line - (to.ch
                        ? 0
                        : 1)) + 1;
                    for (var j = start; j < end; j += 1) {
                        indentLine(this, j, how);
                    }
                    var newRanges = this.doc.sel.ranges;
                    if (from.ch == 0 && ranges.length == newRanges.length && newRanges[i].from().ch > 0) {
                        replaceOneSelection(this.doc, i, new Range(from, newRanges[i].to()), sel_dontScroll);
                    }
                } else if (range.head.line > end) {
                    indentLine(this, range.head.line, how, true);
                    end = range.head.line;
                    if (i == this.doc.sel.primIndex) {
                        ensureCursorVisible(this);
                    }
                }
            }
        }),

        lineAtHeight      : function (height, mode) {
            height = fromCoordSystem(this, {
                left: 0,
                top : height
            }, mode || "page").top;
            return lineAtHeight(this.doc, height + this.display.viewOffset);
        },

        lineInfo          : function (line) {
            if (typeof line == "number") {
                if (!isLine(this.doc, line)) {
                    return null;
                }
                var n = line;
                line = getLine(this.doc, line);
                if (!line) {
                    return null;
                }
            } else {
                var n = lineNo(line);
                if (n == null) {
                    return null;
                }
            }
            return {
                bgClass      : line.bgClass,
                gutterMarkers: line.gutterMarkers,
                handle       : line,
                line         : n,
                text         : line.text,
                textClass    : line.textClass,
                widgets      : line.widgets,
                wrapClass    : line.wrapClass
            };
        },

        moveH             : methodOp(function (dir, unit) {
            var cm = this;
            cm.extendSelectionsBy(function (range) {
                if (cm.display.shift || cm.doc.extend || range.empty()) {
                    return findPosH(cm.doc, range.head, dir, unit, cm.options.rtlMoveVisually);
                } else {
                    return dir < 0
                        ? range.from()
                        : range.to();
                }
            }, sel_move);
        }),

        moveV             : methodOp(function (dir, unit) {
            var cm    = this,
                doc   = this.doc,
                goals = [];
            var collapse = !cm.display.shift && !doc.extend && doc
                .sel
                .somethingSelected();
            doc.extendSelectionsBy(function (range) {
                if (collapse) {
                    return dir < 0
                        ? range.from()
                        : range.to();
                }
                var headPos = cursorCoords(cm, range.head, "div");
                if (range.goalColumn != null) {
                    headPos.left = range.goalColumn;
                }
                goals.push(headPos.left);
                var pos = findPosV(cm, headPos, dir, unit);
                if (unit == "page" && range == doc.sel.primary()) {
                    addToScrollPos(cm, null, charCoords(cm, pos, "div").top - headPos.top);
                }
                return pos;
            }, sel_move);
            if (goals.length) {
                for (var i = 0; i < doc.sel.ranges.length; i += 1) {
                    doc
                        .sel
                        .ranges[i]
                        .goalColumn = goals[i];
                }
            }
        }),

        operation         : function (f) {
            return runInOp(this, f);
        },

        refresh           : methodOp(function () {
            var oldHeight = this.display.cachedTextHeight;
            regChange(this);
            this.curOp.forceUpdate = true;
            clearCaches(this);
            this.scrollTo(this.doc.scrollLeft, this.doc.scrollTop);
            updateGutterSpace(this);
            if (oldHeight == null || Math.abs(oldHeight - textHeight(this.display)) > .5) {
                estimateLineHeights(this);
            }
            signal(this, "refresh", this);
        }),
        removeKeyMap      : function (map) {
            var maps = this.state.keyMaps;
            for (var i = 0; i < maps.length; i += 1) {
                if (maps[i] == map || maps[i].name == map) {
                    maps.splice(i, 1);
                    return true;
                }
            }
        },

        removeLineWidget  : function (widget) {
            widget.clear();
        },
        removeOverlay     : methodOp(function (spec) {
            var overlays = this.state.overlays;
            for (var i = 0; i < overlays.length; i += 1) {
                var cur = overlays[i].modeSpec;
                if (cur == spec || typeof spec == "string" && cur.name == spec) {
                    overlays.splice(i, 1);
                    this.state.modeGen += 1;
                    regChange(this);
                    return;
                }
            }
        }),

        scrollIntoView    : methodOp(function (range, margin) {
            if (range == null) {
                range = {
                    from: this
                        .doc
                        .sel
                        .primary()
                        .head,
                    to  : null
                };
                if (margin == null) {
                    margin = this.options.cursorScrollMargin;
                }
            } else if (typeof range == "number") {
                range = {
                    from: Pos(range, 0),
                    to  : null
                };
            } else if (range.from == null) {
                range = {
                    from: range,
                    to  : null
                };
            }
            if (!range.to) {
                range.to = range.from;
            }
            range.margin = margin || 0;

            if (range.from.line != null) {
                resolveScrollToPos(this);
                this.curOp.scrollToPos = range;
            } else {
                var sPos = calculateScrollPos(this, Math.min(range.from.left, range.to.left), Math.min(range.from.top, range.to.top) - range.margin, Math.max(range.from.right, range.to.right), Math.max(range.from.bottom, range.to.bottom) +
                        range.margin);
                this.scrollTo(sPos.scrollLeft, sPos.scrollTop);
            }
        }),

        scrollTo          : methodOp(function (x, y) {
            if (x != null || y != null) {
                resolveScrollToPos(this);
            }
            if (x != null) {
                this.curOp.scrollLeft = x;
            }
            if (y != null) {
                this.curOp.scrollTop = y;
            }
        }),

        setGutterMarker   : methodOp(function (line, gutterID, value) {
            return changeLine(this.doc, line, "gutter", function (line) {
                var markers = line.gutterMarkers || (line.gutterMarkers = {});
                markers[gutterID] = value;
                if (!value && isEmpty(markers)) {
                    line.gutterMarkers = null;
                }
                return true;
            });
        }),

        setOption         : function (option, value) {
            var options = this.options,
                old     = options[option];
            if (options[option] == value && option != "mode") {
                return;
            }
            options[option] = value;
            if (optionHandlers.hasOwnProperty(option)) {
                operation(this, optionHandlers[option])(this, value, old);
            }
        },

        setSize           : methodOp(function (width, height) {
            var cm = this;
            function interpret(val) {
                return typeof val == "number" || /^\d+$/.test(String(val))
                    ? val + "px"
                    : val;
            }
            if (width != null) {
                cm.display.wrapper.style.width = interpret(width);
            }
            if (height != null) {
                cm.display.wrapper.style.height = interpret(height);
            }
            if (cm.options.lineWrapping) {
                clearLineMeasurementCache(this);
            }
            var lineNo = cm.display.viewFrom;
            cm
                .doc
                .iter(lineNo, cm.display.viewTo, function (line) {
                    if (line.widgets) {
                        for (var i = 0; i < line.widgets.length; i += 1) {
                            if (line.widgets[i].noHScroll) {
                                regLineChange(cm, lineNo, "widget");
                                break;
                            }
                        }
                    }
                    ++lineNo;
                });
            cm.curOp.forceUpdate = true;
            signal(cm, "refresh", this);
        }),

        swapDoc           : methodOp(function (doc) {
            var old = this.doc;
            old.cm = null;
            attachDoc(this, doc);
            clearCaches(this);
            resetInput(this);
            this.scrollTo(doc.scrollLeft, doc.scrollTop);
            this.curOp.forceScroll = true;
            signalLater(this, "swapDoc", this, old);
            return old;
        }),

        toggleOverwrite   : function (value) {
            if (value != null && value == this.state.overwrite) {
                return;
            }
            if (this.state.overwrite = !this.state.overwrite) {
                addClass(this.display.cursorDiv, "CodeMirror-overwrite");
            } else {
                rmClass(this.display.cursorDiv, "CodeMirror-overwrite");
            }

            signal(this, "overwriteToggle", this, this.state.overwrite);
        },

        triggerOnKeyDown  : methodOp(onKeyDown),
        triggerOnKeyPress : methodOp(onKeyPress),
        triggerOnKeyUp    : onKeyUp
    };
    eventMixin(codeMirror);

    // OPTION DEFAULTS The default configuration options.
    var defaults = codeMirror.defaults = {};
    // Functions to run when options are changed.
    var optionHandlers = codeMirror.optionHandlers = {};

    function option(name, deflt, handle, notOnInit) {
        codeMirror.defaults[name] = deflt;
        if (handle) {
            optionHandlers[name] = notOnInit
                ? function (cm, val, old) {
                    if (old != Init) {
                        handle(cm, val, old);
                    }
                }
                : handle;
        }
    }

    // Passed to option handlers when there is no old value.
    var Init = codeMirror.Init = {
        toString: function () {
            return "CodeMirror.Init";
        }
    };

    // These two are, on init, called from the constructor because they have to be
    // initialized before the editor can start at all.
    option("value", "", function (cm, val) {
        cm.setValue(val);
    }, true);
    option("mode", null, function (cm, val) {
        cm.doc.modeOption = val;
        loadMode(cm);
    }, true);

    option("indentUnit", 2, loadMode, true);
    option("indentWithTabs", false);
    option("smartIndent", true);
    option("tabSize", 4, function (cm) {
        resetModeState(cm);
        clearCaches(cm);
        regChange(cm);
    }, true);
    option("specialChars", /[\t\u0000-\u0019\u00ad\u200b-\u200f\u2028\u2029\ufeff]/g, function (cm, val) {
        cm.options.specialChars = new RegExp(val.source + (val.test("\t")
            ? ""
            : "|\t"), "g");
        cm.refresh();
    }, true);
    option("specialCharPlaceholder", defaultSpecialCharPlaceholder, function (cm) {
        cm.refresh();
    }, true);
    option("electricChars", true);
    option("rtlMoveVisually", !windows);
    option("wholeLineUpdateBefore", true);

    option("theme", "default", function (cm) {
        themeChanged(cm);
        guttersChanged(cm);
    }, true);
    option("keyMap", "default", function (cm, val, old) {
        var next = getKeyMap(val);
        var prev = old != codeMirror.Init && getKeyMap(old);
        if (prev && prev.detach) {
            prev.detach(cm, next);
        }
        if (next.attach) {
            next.attach(cm, prev || null);
        }
    });
    option("extraKeys", null);

    option("lineWrapping", false, wrappingChanged, true);
    option("gutters", [], function (cm) {
        setGuttersForLineNumbers(cm.options);
        guttersChanged(cm);
    }, true);
    option("fixedGutter", true, function (cm, val) {
        cm.display.gutters.style.left = val
            ? compensateForHScroll(cm.display) + "px"
            : "0";
        cm.refresh();
    }, true);
    option("coverGutterNextToScrollbar", false, function (cm) {
        updateScrollbars(cm);
    }, true);
    option("scrollbarStyle", "native", function (cm) {
        initScrollbars(cm);
        updateScrollbars(cm);
        cm
            .display
            .scrollbars
            .setScrollTop(cm.doc.scrollTop);
        cm
            .display
            .scrollbars
            .setScrollLeft(cm.doc.scrollLeft);
    }, true);
    option("lineNumbers", false, function (cm) {
        setGuttersForLineNumbers(cm.options);
        guttersChanged(cm);
    }, true);
    option("firstLineNumber", 1, guttersChanged, true);
    option("lineNumberFormatter", function (integer) {
        return integer;
    }, guttersChanged, true);
    option("showCursorWhenSelecting", false, updateSelection, true);

    option("resetSelectionOnContextMenu", true);

    option("readOnly", false, function (cm, val) {
        if (val == "nocursor") {
            onBlur(cm);
            cm
                .display
                .input
                .blur();
            cm.display.disabled = true;
        } else {
            cm.display.disabled = false;
            if (!val) {
                resetInput(cm);
            }
        }
    });
    option("disableInput", false, function (cm, val) {
        if (!val) {
            resetInput(cm);
        }
    }, true);
    option("dragDrop", true);

    option("cursorBlinkRate", 530);
    option("cursorScrollMargin", 0);
    option("cursorHeight", 1, updateSelection, true);
    option("singleCursorHeightPerLine", true, updateSelection, true);
    option("workTime", 100);
    option("workDelay", 100);
    option("flattenSpans", true, resetModeState, true);
    option("addModeClass", false, resetModeState, true);
    option("pollInterval", 100);
    option("undoDepth", 200, function (cm, val) {
        cm.doc.history.undoDepth = val;
    });
    option("historyEventDelay", 1250);
    option("viewportMargin", 10, function (cm) {
        cm.refresh();
    }, true);
    option("maxHighlightLength", 10000, resetModeState, true);
    option("moveInputWithCursor", true, function (cm, val) {
        if (!val) {
            cm.display.inputDiv.style.top = cm.display.inputDiv.style.left = 0;
        }
    });

    option("tabindex", null, function (cm, val) {
        cm.display.input.tabIndex = val || "";
    });
    option("autofocus", null);

    // MODE DEFINITION AND QUERYING Known modes, by name and by MIME
    var modes     = codeMirror.modes = {},
        mimeModes = codeMirror.mimeModes = {};

    // Extra arguments are stored as the mode's dependencies, which is used by
    // (legacy) mechanisms like loadmode.js to automatically load a mode. (Preferred
    // mechanism is the require/define calls.)
    codeMirror.defineMode  = function (name, mode) {
        if (!codeMirror.defaults.mode && name != "null") {
            codeMirror.defaults.mode = name;
        }
        if (arguments.length > 2) {
            mode.dependencies = Array
                .prototype
                .slice
                .call(arguments, 2);
        }
        modes[name] = mode;
    };

    codeMirror.defineMIME  = function (mime, spec) {
        mimeModes[mime] = spec;
    };

    // Given a MIME type, a {name, ...options} config object, or a name string,
    // return a mode config object.
    codeMirror.resolveMode = function (spec) {
        if (typeof spec == "string" && mimeModes.hasOwnProperty(spec)) {
            spec = mimeModes[spec];
        } else if (spec && typeof spec.name == "string" && mimeModes.hasOwnProperty(spec.name)) {
            var found = mimeModes[spec.name];
            if (typeof found == "string") {
                found = {
                    name: found
                };
            }
            spec      = createObj(found, spec);
            spec.name = found.name;
        } else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+xml$/.test(spec)) {
            return codeMirror.resolveMode("application/xml");
        }
        if (typeof spec == "string") {
            return {name: spec};
        } else {
            return spec || {
                name: "null"
            };
        }
    };

    // Given a mode spec (anything that resolveMode accepts), find and initialize an
    // actual mode object.
    codeMirror.getMode     = function (options, spec) {
        var spec = codeMirror.resolveMode(spec);
        var mfactory = modes[spec.name];
        if (!mfactory) {
            return codeMirror.getMode(options, "text/plain");
        }
        var modeObj = mfactory(options, spec);
        if (modeExtensions.hasOwnProperty(spec.name)) {
            var exts = modeExtensions[spec.name];
            for (var prop in exts) {
                if (!exts.hasOwnProperty(prop)) {
                    continue;
                }
                if (modeObj.hasOwnProperty(prop)) {
                    modeObj["_" + prop] = modeObj[prop];
                }
                modeObj[prop] = exts[prop];
            }
        }
        modeObj.name = spec.name;
        if (spec.helperType) {
            modeObj.helperType = spec.helperType;
        }
        if (spec.modeProps) {
            for (var prop in spec.modeProps) {
                modeObj[prop] = spec.modeProps[prop];
            }
        }

        return modeObj;
    };

    // Minimal default mode.
    codeMirror.defineMode("null", function () {
        return {
            token: function (stream) {
                stream.skipToEnd();
            }
        };
    });
    codeMirror.defineMIME("text/plain", "null");

    // This can be used to attach properties to mode objects from outside the actual
    // mode definition.
    var modeExtensions = codeMirror.modeExtensions = {};
    codeMirror.extendMode         = function (mode, properties) {
        var exts = modeExtensions.hasOwnProperty(mode)
            ? modeExtensions[mode]
            : (modeExtensions[mode] = {});
        copyObj(properties, exts);
    };

    // EXTENSIONS

    codeMirror.defineExtension    = function (name, func) {
        codeMirror.prototype[name] = func;
    };
    codeMirror.defineDocExtension = function (name, func) {
        Doc.prototype[name] = func;
    };
    codeMirror.defineOption       = option;

    var initHooks = [];
    codeMirror.defineInitHook = function (f) {
        initHooks.push(f);
    };

    var helpers = codeMirror.helpers = {};
    codeMirror.registerHelper       = function (type, name, value) {
        if (!helpers.hasOwnProperty(type)) {
            helpers[type] = codeMirror[type] = {
                _global: []
            };
        }
        helpers[type][name] = value;
    };
    codeMirror.registerGlobalHelper = function (type, name, predicate, value) {
        codeMirror.registerHelper(type, name, value);
        helpers[type]
            ._global
            .push({pred: predicate, val: value});
    };

    // MODE STATE HANDLING Utility functions for working with state. Exported
    // because nested modes need to do this for their inner modes.

    var copyState = codeMirror.copyState = function (mode, state) {
        if (state === true) {
            return state;
        }
        if (mode.copyState) {
            return mode.copyState(state);
        }
        var nstate = {};
        for (var n in state) {
            var val = state[n];
            if (val instanceof Array) {
                val = val.concat([]);
            }
            nstate[n] = val;
        }
        return nstate;
    };

    var startState = codeMirror.startState = function (mode, a1, a2) {
        return mode.startState
            ? mode.startState(a1, a2)
            : true;
    };

    // Given a mode and a state (for that mode), find the inner mode and state at
    // the position that the state refers to.
    codeMirror.innerMode = function (mode, state) {
        while (mode.innerMode) {
            var info = mode.innerMode(state);
            if (!info || info.mode == mode) {
                break;
            }
            state = info.state;
            mode  = info.mode;
        }
        return info || {
            mode : mode,
            state: state
        };
    };

    // STANDARD COMMANDS Commands are parameter-less actions that can be performed
    // on an editor, mostly used for keybindings.
    var commands = codeMirror.commands = {
        defaultTab         : function (cm) {
            if (cm.somethingSelected()) {
                cm.indentSelection("add");
            } else {
                cm.execCommand("insertTab");
            }
        },
        delCharAfter       : function (cm) {
            cm.deleteH(1, "char");
        },
        delCharBefore      : function (cm) {
            cm.deleteH(-1, "char");
        },
        deleteLine         : function (cm) {
            deleteNearSelection(cm, function (range) {
                return {
                    from: Pos(range.from().line, 0),
                    to  : clipPos(cm.doc, Pos(range.to().line + 1, 0))
                };
            });
        },
        delGroupAfter      : function (cm) {
            cm.deleteH(1, "group");
        },
        delGroupBefore     : function (cm) {
            cm.deleteH(-1, "group");
        },
        delLineLeft        : function (cm) {
            deleteNearSelection(cm, function (range) {
                return {
                    from: Pos(range.from().line, 0),
                    to  : range.from()
                };
            });
        },
        delWordAfter       : function (cm) {
            cm.deleteH(1, "word");
        },
        delWordBefore      : function (cm) {
            cm.deleteH(-1, "word");
        },
        delWrappedLineLeft : function (cm) {
            deleteNearSelection(cm, function (range) {
                var top = cm
                    .charCoords(range.head, "div")
                    .top + 5;
                var leftPos = cm.coordsChar({
                    left: 0,
                    top : top
                }, "div");
                return {from: leftPos, to: range.from()};
            });
        },
        delWrappedLineRight: function (cm) {
            deleteNearSelection(cm, function (range) {
                var top = cm
                    .charCoords(range.head, "div")
                    .top + 5;
                var rightPos = cm.coordsChar({
                    left: cm.display.lineDiv.offsetWidth + 100,
                    top : top
                }, "div");
                return {from: range.from(), to: rightPos};
            });
        },
        goCharLeft         : function (cm) {
            cm.moveH(-1, "char");
        },
        goCharRight        : function (cm) {
            cm.moveH(1, "char");
        },
        goColumnLeft       : function (cm) {
            cm.moveH(-1, "column");
        },
        goColumnRight      : function (cm) {
            cm.moveH(1, "column");
        },
        goDocEnd           : function (cm) {
            cm.extendSelection(Pos(cm.lastLine()));
        },
        goDocStart         : function (cm) {
            cm.extendSelection(Pos(cm.firstLine(), 0));
        },
        goGroupLeft        : function (cm) {
            cm.moveH(-1, "group");
        },
        goGroupRight       : function (cm) {
            cm.moveH(1, "group");
        },
        goLineDown         : function (cm) {
            cm.moveV(1, "line");
        },
        goLineEnd          : function (cm) {
            cm.extendSelectionsBy(function (range) {
                return lineEnd(cm, range.head.line);
            }, {
                bias  : -1,
                origin: "+move"
            });
        },
        goLineLeft         : function (cm) {
            cm.extendSelectionsBy(function (range) {
                var top = cm
                    .charCoords(range.head, "div")
                    .top + 5;
                return cm.coordsChar({
                    left: 0,
                    top : top
                }, "div");
            }, sel_move);
        },
        goLineLeftSmart    : function (cm) {
            cm.extendSelectionsBy(function (range) {
                var top = cm
                    .charCoords(range.head, "div")
                    .top + 5;
                var pos = cm.coordsChar({
                    left: 0,
                    top : top
                }, "div");
                if (pos.ch < cm.getLine(pos.line).search(/\S/)) {
                    return lineStartSmart(cm, range.head);
                }
                return pos;
            }, sel_move);
        },
        goLineRight        : function (cm) {
            cm.extendSelectionsBy(function (range) {
                var top = cm
                    .charCoords(range.head, "div")
                    .top + 5;
                return cm.coordsChar({
                    left: cm.display.lineDiv.offsetWidth + 100,
                    top : top
                }, "div");
            }, sel_move);
        },
        goLineStart        : function (cm) {
            cm.extendSelectionsBy(function (range) {
                return lineStart(cm, range.head.line);
            }, {
                bias  : 1,
                origin: "+move"
            });
        },
        goLineStartSmart   : function (cm) {
            cm.extendSelectionsBy(function (range) {
                return lineStartSmart(cm, range.head);
            }, {
                bias  : 1,
                origin: "+move"
            });
        },
        goLineUp           : function (cm) {
            cm.moveV(-1, "line");
        },
        goPageDown         : function (cm) {
            cm.moveV(1, "page");
        },
        goPageUp           : function (cm) {
            cm.moveV(-1, "page");
        },
        goWordLeft         : function (cm) {
            cm.moveH(-1, "word");
        },
        goWordRight        : function (cm) {
            cm.moveH(1, "word");
        },
        indentAuto         : function (cm) {
            cm.indentSelection("smart");
        },
        indentLess         : function (cm) {
            cm.indentSelection("subtract");
        },
        indentMore         : function (cm) {
            cm.indentSelection("add");
        },
        insertSoftTab      : function (cm) {
            var spaces  = [],
                ranges  = cm.listSelections(),
                tabSize = cm.options.tabSize;
            for (var i = 0; i < ranges.length; i += 1) {
                var pos = ranges[i].from();
                var col = countColumn(cm.getLine(pos.line), pos.ch, tabSize);
                spaces.push([tabSize - col % tabSize + 1].join(" "));
            }
            cm.replaceSelections(spaces);
        },
        insertTab          : function (cm) {
            cm.replaceSelection("\t");
        },
        killLine           : function (cm) {
            deleteNearSelection(cm, function (range) {
                if (range.empty()) {
                    var len = getLine(cm.doc, range.head.line).text.length;
                    if (range.head.ch == len && range.head.line < cm.lastLine()) {
                        return {
                            from: range.head,
                            to  : Pos(range.head.line + 1, 0)
                        };
                    } else {
                        return {
                            from: range.head,
                            to  : Pos(range.head.line, len)
                        };
                    }
                } else {
                    return {from: range.from(), to: range.to()};
                }
            });
        },
        newlineAndIndent   : function (cm) {
            runInOp(cm, function () {
                var len = cm
                    .listSelections()
                    .length;
                for (var i = 0; i < len; i += 1) {
                    var range = cm.listSelections()[i];
                    cm.replaceRange("\n", range.anchor, range.head, "+input");
                    cm.indentLine(range.from().line + 1, null, true);
                    ensureCursorVisible(cm);
                }
            });
        },
        redo               : function (cm) {
            cm.redo();
        },
        redoSelection      : function (cm) {
            cm.redoSelection();
        },
        selectAll          : function (cm) {
            cm.setSelection(Pos(cm.firstLine(), 0), Pos(cm.lastLine()), sel_dontScroll);
        },
        singleSelection    : function (cm) {
            cm.setSelection(cm.getCursor("anchor"), cm.getCursor("head"), sel_dontScroll);
        },
        toggleOverwrite    : function (cm) {
            cm.toggleOverwrite();
        },
        transposeChars     : function (cm) {
            runInOp(cm, function () {
                var ranges = cm.listSelections(),
                    newSel = [];
                for (var i = 0; i < ranges.length; i += 1) {
                    var cur  = ranges[i].head,
                        line = getLine(cm.doc, cur.line).text;
                    if (line) {
                        if (cur.ch == line.length) {
                            cur = new Pos(cur.line, cur.ch - 1);
                        }
                        if (cur.ch > 0) {
                            cur = new Pos(cur.line, cur.ch + 1);
                            cm.replaceRange(line.charAt(cur.ch - 1) + line.charAt(cur.ch - 2), Pos(cur.line, cur.ch - 2), cur, "+transpose");
                        } else if (cur.line > cm.doc.first) {
                            var prev = getLine(cm.doc, cur.line - 1).text;
                            if (prev) {
                                cm.replaceRange(line.charAt(0) + "\n" + prev.charAt(prev.length - 1), Pos(cur.line - 1, prev.length - 1), Pos(cur.line, 1), "+transpose");
                            }
                        }
                    }
                    newSel.push(new Range(cur, cur));
                }
                cm.setSelections(newSel);
            });
        },
        undo               : function (cm) {
            cm.undo();
        },
        undoSelection      : function (cm) {
            cm.undoSelection();
        }
    };


    // STANDARD KEYMAPS

    var keyMap = codeMirror.keyMap = {};

    keyMap.basic      = {
        "Backspace"      : "delCharBefore",
        "Delete"         : "delCharAfter",
        "Down"           : "goLineDown",
        "End"            : "goLineEnd",
        "Enter"          : "newlineAndIndent",
        "Esc"            : "singleSelection",
        "Home"           : "goLineStartSmart",
        "Insert"         : "toggleOverwrite",
        "Left"           : "goCharLeft",
        "PageDown"       : "goPageDown",
        "PageUp"         : "goPageUp",
        "Right"          : "goCharRight",
        "Shift-Backspace": "delCharBefore",
        "Shift-Tab"      : "indentAuto",
        "Tab"            : "defaultTab",
        "Up"             : "goLineUp"
    };
    // Note that the save and find-related commands aren't defined by default. User
    // code or addons can define them. Unknown commands are simply ignored.
    keyMap.pcDefault  = {
        "Alt-Left"      : "goLineStart",
        "Alt-Right"     : "goLineEnd",
        "Alt-U"         : "redoSelection",
        "Ctrl-["        : "indentLess",
        "Ctrl-]"        : "indentMore",
        "Ctrl-A"        : "selectAll",
        "Ctrl-Backspace": "delGroupBefore",
        "Ctrl-D"        : "deleteLine",
        "Ctrl-Delete"   : "delGroupAfter",
        "Ctrl-Down"     : "goLineDown",
        "Ctrl-End"      : "goDocEnd",
        "Ctrl-F"        : "find",
        "Ctrl-G"        : "findNext",
        "Ctrl-Home"     : "goDocStart",
        "Ctrl-Left"     : "goGroupLeft",
        "Ctrl-Right"    : "goGroupRight",
        "Ctrl-S"        : "save",
        "Ctrl-U"        : "undoSelection",
        "Ctrl-Up"       : "goLineUp",
        "Ctrl-Y"        : "redo",
        "Ctrl-Z"        : "undo",
        "Shift-Ctrl-F"  : "replace",
        "Shift-Ctrl-G"  : "findPrev",
        "Shift-Ctrl-R"  : "replaceAll",
        "Shift-Ctrl-U"  : "redoSelection",
        "Shift-Ctrl-Z"  : "redo",
        fallthrough     : "basic"
    };
    // Very basic readline/emacs-style bindings, which are standard on Mac.
    keyMap.emacsy     = {
        "Alt-B"        : "goWordLeft",
        "Alt-Backspace": "delWordBefore",
        "Alt-D"        : "delWordAfter",
        "Alt-F"        : "goWordRight",
        "Ctrl-A"       : "goLineStart",
        "Ctrl-B"       : "goCharLeft",
        "Ctrl-D"       : "delCharAfter",
        "Ctrl-E"       : "goLineEnd",
        "Ctrl-F"       : "goCharRight",
        "Ctrl-H"       : "delCharBefore",
        "Ctrl-K"       : "killLine",
        "Ctrl-N"       : "goLineDown",
        "Ctrl-P"       : "goLineUp",
        "Ctrl-T"       : "transposeChars",
        "Ctrl-V"       : "goPageDown",
        "Shift-Ctrl-V" : "goPageUp"
    };
    keyMap.macDefault = {
        "Alt-Backspace"     : "delGroupBefore",
        "Alt-Delete"        : "delGroupAfter",
        "Alt-Left"          : "goGroupLeft",
        "Alt-Right"         : "goGroupRight",
        "Cmd-["             : "indentLess",
        "Cmd-]"             : "indentMore",
        "Cmd-A"             : "selectAll",
        "Cmd-Alt-F"         : "replace",
        "Cmd-Backspace"     : "delWrappedLineLeft",
        "Cmd-D"             : "deleteLine",
        "Cmd-Delete"        : "delWrappedLineRight",
        "Cmd-Down"          : "goDocEnd",
        "Cmd-End"           : "goDocEnd",
        "Cmd-F"             : "find",
        "Cmd-G"             : "findNext",
        "Cmd-Home"          : "goDocStart",
        "Cmd-Left"          : "goLineLeft",
        "Cmd-Right"         : "goLineRight",
        "Cmd-S"             : "save",
        "Cmd-U"             : "undoSelection",
        "Cmd-Up"            : "goDocStart",
        "Cmd-Y"             : "redo",
        "Cmd-Z"             : "undo",
        "Ctrl-Alt-Backspace": "delGroupAfter",
        "Ctrl-Down"         : "goDocEnd",
        "Ctrl-Up"           : "goDocStart",
        "Shift-Cmd-Alt-F"   : "replaceAll",
        "Shift-Cmd-G"       : "findPrev",
        "Shift-Cmd-U"       : "redoSelection",
        "Shift-Cmd-Z"       : "redo",
        fallthrough         : ["basic", "emacsy"]
    };
    keyMap["default"] = mac
        ? keyMap.macDefault
        : keyMap.pcDefault;

    // KEYMAP DISPATCH

    function normalizeKeyName(name) {
        var parts = name.split(/-(?!$)/),
            name  = parts[parts.length - 1];
        var alt,
            ctrl,
            shift,
            cmd;
        for (var i = 0; i < parts.length - 1; i += 1) {
            var mod = parts[i];
            if (/^(cmd|meta|m)$/i.test(mod)) {
                cmd = true;
            } else if (/^a(lt)?$/i.test(mod)) {
                alt = true;
            } else if (/^(c|ctrl|control)$/i.test(mod)) {
                ctrl = true;
            } else if (/^s(hift)$/i.test(mod)) {
                shift = true;
            } else {
                throw new Error("Unrecognized modifier name: " + mod);
            }
        }
        if (alt) {
            name = "Alt-" + name;
        }
        if (ctrl) {
            name = "Ctrl-" + name;
        }
        if (cmd) {
            name = "Cmd-" + name;
        }
        if (shift) {
            name = "Shift-" + name;
        }
        return name;
    }

    // This is a kludge to keep keymaps mostly working as raw objects (backwards
    // compatibility) while at the same time support features like normalization and
    // multi-stroke key bindings. It compiles a new normalized keymap, and then
    // updates the old object to reflect this.
    codeMirror.normalizeKeyMap = function (keymap) {
        var copy = {};
        for (var keyname in keymap) {
            if (keymap.hasOwnProperty(keyname)) {
                var value = keymap[keyname];
                if (/^(name|fallthrough|(de|at)tach)$/.test(keyname)) {
                    continue;
                }
                if (value == "...") {
                    delete keymap[keyname];
                    continue;
                }

                var keys = map(keyname.split(" "), normalizeKeyName);
                for (var i = 0; i < keys.length; i += 1) {
                    var val,
                        name;
                    if (i == keys.length - 1) {
                        name = keyname;
                        val  = value;
                    } else {
                        name = keys
                            .slice(0, i + 1)
                            .join(" ");
                        val  = "...";
                    }
                    var prev = copy[name];
                    if (!prev) {
                        copy[name] = val;
                    } else if (prev != val) {
                        throw new Error("Inconsistent bindings for " + name);
                    }
                }
                delete keymap[keyname];
            }
        }
        for (var prop in copy) {
            keymap[prop] = copy[prop];
        }
        return keymap;
    };

    var lookupKey = codeMirror.lookupKey = function (key, map, handle, context) {
        map = getKeyMap(map);
        var found = map.call
            ? map.call(key, context)
            : map[key];
        if (found === false) {
            return "nothing";
        }
        if (found === "...") {
            return "multi";
        }
        if (found != null && handle(found)) {
            return "handled";
        }

        if (map.fallthrough) {
            if (Object.prototype.toString.call(map.fallthrough) != "[object Array]") {
                return lookupKey(key, map.fallthrough, handle, context);
            }
            for (var i = 0; i < map.fallthrough.length; i += 1) {
                var result = lookupKey(key, map.fallthrough[i], handle, context);
                if (result) {
                    return result;
                }
            }
        }
    };

    // Modifier key presses don't count as 'real' key presses for the purpose of
    // keymap fallthrough.
    var isModifierKey = codeMirror.isModifierKey = function (value) {
        var name = typeof value == "string"
            ? value
            : keyNames[value.keyCode];
        return name == "Ctrl" || name == "Alt" || name == "Shift" || name == "Mod";
    };

    // Look up the name of a key as indicated by an event object.
    var keyName = codeMirror.keyName = function (event, noShift) {
        if (presto && event.keyCode == 34 && event["char"]) {
            return false;
        }
        var base = keyNames[event.keyCode],
            name = base;
        if (name == null || event.altGraphKey) {
            return false;
        }
        if (event.altKey && base != "Alt") {
            name = "Alt-" + name;
        }
        if ((flipCtrlCmd
            ? event.metaKey
            : event.ctrlKey) && base != "Ctrl") {
            name = "Ctrl-" + name;
        }
        if ((flipCtrlCmd
            ? event.ctrlKey
            : event.metaKey) && base != "Cmd") {
            name = "Cmd-" + name;
        }
        if (!noShift && event.shiftKey && base != "Shift") {
            name = "Shift-" + name;
        }
        return name;
    };

    function getKeyMap(val) {
        return typeof val == "string"
            ? keyMap[val]
            : val;
    }

    // FROMTEXTAREA

    codeMirror.fromTextArea = function (textarea, options) {
        if (!options) {
            options = {};
        }
        options.value = textarea.value;
        if (!options.tabindex && textarea.tabindex) {
            options.tabindex = textarea.tabindex;
        }
        if (!options.placeholder && textarea.placeholder) {
            options.placeholder = textarea.placeholder;
        }
        // Set autofocus to true if this textarea is focused, or if it has autofocus and
        // no other element is focused.
        if (options.autofocus == null) {
            var hasFocus = activeElt();
            options.autofocus = hasFocus == textarea || textarea.getAttribute("autofocus") != null && hasFocus == document.body;
        }

        function save() {
            textarea.value = cm.getValue();
        }
        if (textarea.form) {
            on(textarea.form, "submit", save);
            // Deplorable hack to make the submit method do the right thing.
            if (!options.leaveSubmitMethodAlone) {
                var form       = textarea.form,
                    realSubmit = form.submit;
                try {
                    var wrappedSubmit = form.submit = function () {
                        save();
                        form.submit = realSubmit;
                        form.submit();
                        form.submit = wrappedSubmit;
                    };
                } catch (e) {}
            }
        }

        textarea.style.display = "none";
        var cm = codeMirror(function (node) {
            textarea
                .parentNode
                .insertBefore(node, textarea.nextSibling);
        }, options);
        cm.save        = save;
        cm.getTextArea = function () {
            return textarea;
        };
        cm.toTextArea  = function () {
            cm.toTextArea = isNaN; // Prevent this from being ran twice
            save();
            textarea
                .parentNode
                .removeChild(cm.getWrapperElement());
            textarea.style.display = "";
            if (textarea.form) {
                off(textarea.form, "submit", save);
                if (typeof textarea.form.submit == "function") {
                    textarea.form.submit = realSubmit;
                }
            }
        };
        return cm;
    };

    // STRING STREAM Fed to the mode parsers, provides helper functions to make
    // parsers more succinct.

    var StringStream = codeMirror.StringStream = function (string, tabSize) {
        this.pos           = this.start = 0;
        this.string        = string;
        this.tabSize       = tabSize || 8;
        this.lastColumnPos = this.lastColumnValue = 0;
        this.lineStart     = 0;
    };

    StringStream.prototype = {
        backUp        : function (n) {
            this.pos -= n;
        },
        column        : function () {
            if (this.lastColumnPos < this.start) {
                this.lastColumnValue = countColumn(this.string, this.start, this.tabSize, this.lastColumnPos, this.lastColumnValue);
                this.lastColumnPos   = this.start;
            }
            return this.lastColumnValue - (this.lineStart
                ? countColumn(this.string, this.lineStart, this.tabSize)
                : 0);
        },
        current       : function () {
            return this
                .string
                .slice(this.start, this.pos);
        },
        eat           : function (match) {
            var ch = this
                .string
                .charAt(this.pos);
            if (typeof match == "string") {
                var ok = ch == match;
            } else {
                var ok = ch && (match.test
                    ? match.test(ch)
                    : match(ch));
            }
            if (ok) {
                ++this.pos;
                return ch;
            }
        },
        eatSpace      : function () {
            var start = this.pos;
            while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) {
                ++this.pos;
            }
            return this.pos > start;
        },
        eatWhile      : function (match) {
            var start = this.pos;
            while (this.eat(match)) {}
            return this.pos > start;
        },
        eol           : function () {
            return this.pos >= this.string.length;
        },
        hideFirstChars: function (n, inner) {
            this.lineStart += n;
            try {
                return inner();
            } finally {
                this.lineStart -= n;
            }
        },
        indentation   : function () {
            return countColumn(this.string, null, this.tabSize) - (this.lineStart
                ? countColumn(this.string, this.lineStart, this.tabSize)
                : 0);
        },
        match         : function (pattern, consume, caseInsensitive) {
            if (typeof pattern == "string") {
                var cased = function (str) {
                    return caseInsensitive
                        ? str.toLowerCase()
                        : str;
                };
                var substr = this
                    .string
                    .substr(this.pos, pattern.length);
                if (cased(substr) == cased(pattern)) {
                    if (consume !== false) {
                        this.pos += pattern.length;
                    }
                    return true;
                }
            } else {
                var match = this
                    .string
                    .slice(this.pos)
                    .match(pattern);
                if (match && match.index > 0) {
                    return null;
                }
                if (match && consume !== false) {
                    this.pos += match[0].length;
                }
                return match;
            }
        },
        next          : function () {
            if (this.pos < this.string.length) {
                return this
                    .string
                    .charAt(this.pos++);
            }
        },
        peek          : function () {
            return this
                .string
                .charAt(this.pos) || undefined;
        },
        skipTo        : function (ch) {
            var found = this
                .string
                .indexOf(ch, this.pos);
            if (found > -1) {
                this.pos = found;
                return true;
            }
        },
        skipToEnd     : function () {
            this.pos = this.string.length;
        },
        sol           : function () {
            return this.pos == this.lineStart;
        }
    };

    // TEXTMARKERS Created with markText and setBookmark methods. A TextMarker is a
    // handle that can be used to clear or find a marked position in the document.
    // Line objects hold arrays (markedSpans) containing {from, to, marker} object
    // pointing to such marker objects, and indicating that such a marker is present
    // on that line. Multiple lines may point to the same marker when it spans
    // across lines. The spans will have null for their from/to properties when the
    // marker continues beyond the start/end of the line. Markers have links back to
    // the lines they currently touch.

    var TextMarker = codeMirror.TextMarker = function (doc, type) {
        this.lines = [];
        this.type  = type;
        this.doc   = doc;
    };
    eventMixin(TextMarker);

    // Clear the marker.
    TextMarker.prototype.clear      = function () {
        if (this.explicitlyCleared) {
            return;
        }
        var cm     = this.doc.cm,
            withOp = cm && !cm.curOp;
        if (withOp) {
            startOperation(cm);
        }
        if (hasHandler(this, "clear")) {
            var found = this.find();
            if (found) {
                signalLater(this, "clear", found.from, found.to);
            }
        }
        var min = null,
            max = null;
        for (var i = 0; i < this.lines.length; i += 1) {
            var line = this.lines[i];
            var span = getMarkedSpanFor(line.markedSpans, this);
            if (cm && !this.collapsed) {
                regLineChange(cm, lineNo(line), "text");
            } else if (cm) {
                if (span.to != null) {
                    max = lineNo(line);
                }
                if (span.from != null) {
                    min = lineNo(line);
                }
            }
            line.markedSpans = removeMarkedSpan(line.markedSpans, span);
            if (span.from == null && this.collapsed && !lineIsHidden(this.doc, line) && cm) {
                updateLineHeight(line, textHeight(cm.display));
            }
        }
        if (cm && this.collapsed && !cm.options.lineWrapping) {
            for (var i = 0; i < this.lines.length; i += 1) {
                var visual = visualLine(this.lines[i]),
                    len    = lineLength(visual);
                if (len > cm.display.maxLineLength) {
                    cm.display.maxLine        = visual;
                    cm.display.maxLineLength  = len;
                    cm.display.maxLineChanged = true;
                }
            }
        }

        if (min != null && cm && this.collapsed) {
            regChange(cm, min, max + 1);
        }
        this.lines.length      = 0;
        this.explicitlyCleared = true;
        if (this.atomic && this.doc.cantEdit) {
            this.doc.cantEdit = false;
            if (cm) {
                reCheckSelection(cm.doc);
            }
        }
        if (cm) {
            signalLater(cm, "markerCleared", cm, this);
        }
        if (withOp) {
            endOperation(cm);
        }
        if (this.parent) {
            this
                .parent
                .clear();
        };
    }

    // Find the position of the marker in the document. Returns a {from, to} object
    // by default. Side can be passed to get a specific side -- 0 (both), -1 (left),
    // or 1 (right). When lineObj is true, the Pos objects returned contain a line
    // object, rather than a line number (used to prevent looking up the same line
    // twice).
    TextMarker.prototype.find       = function (side, lineObj) {
        if (side == null && this.type == "bookmark") {
            side = 1;
        }
        var from,
            to;
        for (var i = 0; i < this.lines.length; i += 1) {
            var line = this.lines[i];
            var span = getMarkedSpanFor(line.markedSpans, this);
            if (span.from != null) {
                from = Pos(lineObj
                    ? line
                    : lineNo(line),
                span.from);
                if (side == -1) {
                    return from;
                }
            }
            if (span.to != null) {
                to = Pos(lineObj
                    ? line
                    : lineNo(line),
                span.to);
                if (side == 1) {
                    return to;
                }
            }
        }
        return from && {
            from: from,
            to  : to
        };
    };

    // Signals that the marker's widget changed, and surrounding layout should be
    // recomputed.
    TextMarker.prototype.changed    = function () {
        var pos    = this.find(-1, true),
            widget = this,
            cm     = this.doc.cm;
        if (!pos || !cm) {
            return;
        }
        runInOp(cm, function () {
            var line  = pos.line,
                lineN = lineNo(pos.line);
            var view = findViewForLine(cm, lineN);
            if (view) {
                clearLineMeasurementCacheFor(view);
                cm.curOp.selectionChanged = cm.curOp.forceUpdate = true;
            }
            cm.curOp.updateMaxLine = true;
            if (!lineIsHidden(widget.doc, line) && widget.height != null) {
                var oldHeight = widget.height;
                widget.height = null;
                var dHeight = widgetHeight(widget) - oldHeight;
                if (dHeight) {
                    updateLineHeight(line, line.height + dHeight);
                }
            }
        });
    };

    TextMarker.prototype.attachLine = function (line) {
        if (!this.lines.length && this.doc.cm) {
            var op = this.doc.cm.curOp;
            if (!op.maybeHiddenMarkers || indexOf(op.maybeHiddenMarkers, this) == -1) {
                (op.maybeUnhiddenMarkers || (op.maybeUnhiddenMarkers = [])).push(this);
            }
        }
        this
            .lines
            .push(line);
    };
    TextMarker.prototype.detachLine = function (line) {
        this
            .lines
            .splice(indexOf(this.lines, line), 1);
        if (!this.lines.length && this.doc.cm) {
            var op = this.doc.cm.curOp;
            (op.maybeHiddenMarkers || (op.maybeHiddenMarkers = [])).push(this);
        }
    };

    // Collapsed markers have unique ids, in order to be able to order them, which
    // is needed for uniquely determining an outer marker when they overlap (they
    // may nest, but not partially overlap).
    var nextMarkerId = 0;

    // Create a marker, wire it up to the right lines, and
    function markText(doc, from, to, options, type) {
        // Shared markers (across linked documents) are handled separately
        // (markTextShared will call out to this again, once per document).
        if (options && options.shared) {
            return markTextShared(doc, from, to, options, type);
        }
        // Ensure we are in an operation.
        if (doc.cm && !doc.cm.curOp) {
            return operation(doc.cm, markText)(doc, from, to, options, type);
        }

        var marker = new TextMarker(doc, type),
            diff   = cmp(from, to);
        if (options) {
            copyObj(options, marker, false);
        }
        // Don't connect empty markers unless clearWhenEmpty is false
        if (diff > 0 || diff == 0 && marker.clearWhenEmpty !== false) {
            return marker;
        }
        if (marker.replacedWith) {
            // Showing up as a widget implies collapsed (widget replaces text)
            marker.collapsed  = true;
            marker.widgetNode = elt("span", [marker.replacedWith], "CodeMirror-widget");
            if (!options.handleMouseEvents) {
                marker
                    .widgetNode
                    .setAttribute("cm-ignore-events", "true");
            }
            if (options.insertLeft) {
                marker.widgetNode.insertLeft = true;
            }
        }
        if (marker.collapsed) {
            if (conflictingCollapsedRange(doc, from.line, from, to, marker) || from.line != to.line && conflictingCollapsedRange(doc, to.line, from, to, marker)) {
                throw new Error("Inserting collapsed marker partially overlapping an existing one");
            }
            sawCollapsedSpans = true;
        }

        if (marker.addToHistory) {
            addChangeToHistory(doc, {
                from  : from,
                origin: "markText",
                to    : to
            }, doc.sel, NaN);
        }

        var curLine = from.line,
            cm      = doc.cm,
            updateMaxLine;
        doc.iter(curLine, to.line + 1, function (line) {
            if (cm && marker.collapsed && !cm.options.lineWrapping && visualLine(line) == cm.display.maxLine) {
                updateMaxLine = true;
            }
            if (marker.collapsed && curLine != from.line) {
                updateLineHeight(line, 0);
            }
            addMarkedSpan(line, new MarkedSpan(marker, curLine == from.line
                ? from.ch
                : null,
            curLine == to.line
                ? to.ch
                : null));
            curLine += 1;
        });
        // lineIsHidden depends on the presence of the spans, so needs a second pass
        if (marker.collapsed) {
            doc.iter(from.line, to.line + 1, function (line) {
                if (lineIsHidden(doc, line)) {
                    updateLineHeight(line, 0);
                }
            });
        }

        if (marker.clearOnEnter) {
            on(marker, "beforeCursorEnter", function () {
                marker.clear();
            });
        }

        if (marker.readOnly) {
            sawReadOnlySpans = true;
            if (doc.history.done.length || doc.history.undone.length) {
                doc.clearHistory();
            }
        }
        if (marker.collapsed) {
            marker.id     = ++nextMarkerId;
            marker.atomic = true;
        }
        if (cm) {
            // Sync editor state
            if (updateMaxLine) {
                cm.curOp.updateMaxLine = true;
            }
            if (marker.collapsed) {
                regChange(cm, from.line, to.line + 1);
            } else if (marker.className || marker.title || marker.startStyle || marker.endStyle || marker.css) {
                for (var i = from.line; i <= to.line; i += 1) {
                    regLineChange(cm, i, "text");
                }
            }
            if (marker.atomic) {
                reCheckSelection(cm.doc);
            }
            signalLater(cm, "markerAdded", cm, marker);
        }
        return marker;
    }

    // SHARED TEXTMARKERS A shared marker spans multiple linked documents. It is
    // implemented as a meta-marker-object controlling multiple normal markers.
    var SharedTextMarker = codeMirror.SharedTextMarker = function (markers, primary) {
        this.markers = markers;
        this.primary = primary;
        for (var i = 0; i < markers.length; i += 1) {
            markers[i].parent = this;
        };
    }
    eventMixin(SharedTextMarker);

    SharedTextMarker.prototype.clear = function () {
        if (this.explicitlyCleared) {
            return;
        }
        this.explicitlyCleared = true;
        for (var i = 0; i < this.markers.length; i += 1) {
            this
                .markers[i]
                .clear();
        }
        signalLater(this, "clear");
    };
    SharedTextMarker.prototype.find  = function (side, lineObj) {
        return this
            .primary
            .find(side, lineObj);
    };

    function markTextShared(doc, from, to, options, type) {
        options        = copyObj(options);
        options.shared = false;
        var markers = [markText(doc, from, to, options, type)],
            primary = markers[0];
        var widget = options.widgetNode;
        linkedDocs(doc, function (doc) {
            if (widget) {
                options.widgetNode = widget.cloneNode(true);
            }
            markers.push(markText(doc, clipPos(doc, from), clipPos(doc, to), options, type));
            for (var i = 0; i < doc.linked.length; i += 1) {
                if (doc.linked[i].isParent) {
                    return;
                }
            }
            primary = lst(markers);
        });
        return new SharedTextMarker(markers, primary);
    }

    function findSharedMarkers(doc) {
        return doc.findMarks(Pos(doc.first, 0), doc.clipPos(Pos(doc.lastLine())), function (m) {
            return m.parent;
        });
    }

    function copySharedMarkers(doc, markers) {
        for (var i = 0; i < markers.length; i += 1) {
            var marker = markers[i],
                pos    = marker.find();
            var mFrom = doc.clipPos(pos.from),
                mTo   = doc.clipPos(pos.to);
            if (cmp(mFrom, mTo)) {
                var subMark = markText(doc, mFrom, mTo, marker.primary, marker.primary.type);
                marker
                    .markers
                    .push(subMark);
                subMark.parent = marker;
            }
        }
    }

    function detachSharedMarkers(markers) {
        for (var i = 0; i < markers.length; i += 1) {
            var marker = markers[i],
                linked = [marker.primary.doc];;
            linkedDocs(marker.primary.doc, function (d) {
                linked.push(d);
            });
            for (var j = 0; j < marker.markers.length; j += 1) {
                var subMarker = marker.markers[j];
                if (indexOf(linked, subMarker.doc) == -1) {
                    subMarker.parent = null;
                    marker
                        .markers
                        .splice(j--, 1);
                }
            }
        }
    }

    // TEXTMARKER SPANS

    function MarkedSpan(marker, from, to) {
        this.marker = marker;
        this.from   = from;
        this.to     = to;
    }

    // Search an array of spans for a span matching the given marker.
    function getMarkedSpanFor(spans, marker) {
        if (spans) {
            for (var i = 0; i < spans.length; i += 1) {
                var span = spans[i];
                if (span.marker == marker) {
                    return span;
                }
            }
        }
    }
    // Remove a span from an array, returning undefined if no spans are left (we
    // don't store arrays for lines without spans).
    function removeMarkedSpan(spans, span) {
        for (var r, i = 0; i < spans.length; i += 1) {
            if (spans[i] != span) {
                (r || (r = [])).push(spans[i]);
            }
        }
        return r;
    }
    // Add a span to a line.
    function addMarkedSpan(line, span) {
        line.markedSpans = line.markedSpans
            ? line
                .markedSpans
                .concat([span])
            : [span];
        span
            .marker
            .attachLine(line);
    }

    // Used for the algorithm that adjusts markers for a change in the document.
    // These functions cut an array of spans at a given character position,
    // returning an array of remaining chunks (or undefined if nothing remains).
    function markedSpansBefore(old, startCh, isInsert) {
        if (old) {
            for (var i = 0, nw; i < old.length; i += 1) {
                var span   = old[i],
                    marker = span.marker;
                var startsBefore = span.from == null || (marker.inclusiveLeft
                    ? span.from <= startCh
                    : span.from < startCh);
                if (startsBefore || span.from == startCh && marker.type == "bookmark" && (!isInsert || !span.marker.insertLeft)) {
                    var endsAfter = span.to == null || (marker.inclusiveRight
                        ? span.to >= startCh
                        : span.to > startCh);
                    (nw || (nw = [])).push(new MarkedSpan(marker, span.from, endsAfter
                        ? null
                        : span.to));
                }
            }
        }
        return nw;
    }
    function markedSpansAfter(old, endCh, isInsert) {
        if (old) {
            for (var i = 0, nw; i < old.length; i += 1) {
                var span   = old[i],
                    marker = span.marker;
                var endsAfter = span.to == null || (marker.inclusiveRight
                    ? span.to >= endCh
                    : span.to > endCh);
                if (endsAfter || span.from == endCh && marker.type == "bookmark" && (!isInsert || span.marker.insertLeft)) {
                    var startsBefore = span.from == null || (marker.inclusiveLeft
                        ? span.from <= endCh
                        : span.from < endCh);
                    (nw || (nw = [])).push(new MarkedSpan(marker, startsBefore
                        ? null
                        : span.from - endCh,
                    span.to == null
                        ? null
                        : span.to - endCh));
                }
            }
        }
        return nw;
    }

    // Given a change object, compute the new set of marker spans that cover the
    // line in which the change took place. Removes spans entirely within the
    // change, reconnects spans belonging to the same marker that appear on both
    // sides of the change, and cuts off spans partially within the change. Returns
    // an array of span arrays with one element for each line in (after) the change.
    function stretchSpansOverChange(doc, change) {
        if (change.full) {
            return null;
        }
        var oldFirst = isLine(doc, change.from.line) && getLine(doc, change.from.line).markedSpans;
        var oldLast = isLine(doc, change.to.line) && getLine(doc, change.to.line).markedSpans;
        if (!oldFirst && !oldLast) {
            return null;
        }

        var startCh  = change.from.ch,
            endCh    = change.to.ch,
            isInsert = cmp(change.from, change.to) == 0;
        // Get the spans that 'stick out' on both sides
        var first = markedSpansBefore(oldFirst, startCh, isInsert);
        var last = markedSpansAfter(oldLast, endCh, isInsert);

        // Next, merge those two ends
        var sameLine = change.text.length == 1,
            offset   = lst(change.text).length + (sameLine
                ? startCh
                : 0);
        if (first) {
            // Fix up .to properties of first
            for (var i = 0; i < first.length; i += 1) {
                var span = first[i];
                if (span.to == null) {
                    var found = getMarkedSpanFor(last, span.marker);
                    if (!found) {
                        span.to = startCh;
                    } else if (sameLine) {
                        span.to = found.to == null
                            ? null
                            : found.to + offset;
                    }
                }
            }
        }
        if (last) {
            // Fix up .from in last (or move them into first in case of sameLine)
            for (var i = 0; i < last.length; i += 1) {
                var span = last[i];
                if (span.to != null) {
                    span.to += offset;
                }
                if (span.from == null) {
                    var found = getMarkedSpanFor(first, span.marker);
                    if (!found) {
                        span.from = offset;
                        if (sameLine) {
                            (first || (first = [])).push(span);
                        }
                    }
                } else {
                    span.from += offset;
                    if (sameLine) {
                        (first || (first = [])).push(span);
                    }
                }
            }
        }
        // Make sure we didn't create any zero-length spans
        if (first) {
            first = clearEmptySpans(first);
        }
        if (last && last != first) {
            last = clearEmptySpans(last);
        }

        var newMarkers = [first];
        if (!sameLine) {
            // Fill gap with whole-line-spans
            var gap = change.text.length - 2,
                gapMarkers;
            if (gap > 0 && first) {
                for (var i = 0; i < first.length; i += 1) {
                    if (first[i].to == null) {
                        (gapMarkers || (gapMarkers = [])).push(new MarkedSpan(first[i].marker, null, null));
                    }
                }
            }
            for (var i = 0; i < gap; i += 1) {
                newMarkers.push(gapMarkers);
            }
            newMarkers.push(last);
        }
        return newMarkers;
    }

    // Remove spans that are empty and don't have a clearWhenEmpty option of false.
    function clearEmptySpans(spans) {
        for (var i = 0; i < spans.length; i += 1) {
            var span = spans[i];
            if (span.from != null && span.from == span.to && span.marker.clearWhenEmpty !== false) {
                spans.splice(i--, 1);
            }
        }
        if (!spans.length) {
            return null;
        }
        return spans;
    }

    // Used for un/re-doing changes from the history. Combines the result of
    // computing the existing spans with the set of spans that existed in the
    // history (so that deleting around a span and then undoing brings back the
    // span).
    function mergeOldSpans(doc, change) {
        var old = getOldSpans(doc, change);
        var stretched = stretchSpansOverChange(doc, change);
        if (!old) {
            return stretched;
        }
        if (!stretched) {
            return old;
        }

        for (var i = 0; i < old.length; i += 1) {
            var oldCur     = old[i],
                stretchCur = stretched[i];
            if (oldCur && stretchCur) {
                spans : for (var j = 0; j < stretchCur.length; j += 1) {
                    var span = stretchCur[j];
                    for (var k = 0; k < oldCur.length; k += 1) {
                        if (oldCur[k].marker == span.marker) {
                            continue spans;
                        }
                    }
                    oldCur.push(span);
                };
            } else if (stretchCur) {
                old[i] = stretchCur;
            }
        }
        return old;
    }

    // Used to 'clip' out readOnly ranges when making a change.
    function removeReadOnlyRanges(doc, from, to) {
        var markers = null;
        doc.iter(from.line, to.line + 1, function (line) {
            if (line.markedSpans) {
                for (var i = 0; i < line.markedSpans.length; i += 1) {
                    var mark = line
                        .markedSpans[i]
                        .marker;
                    if (mark.readOnly && (!markers || indexOf(markers, mark) == -1)) {
                        (markers || (markers = [])).push(mark);
                    }
                }
            }
        });
        if (!markers) {
            return null;
        }
        var parts = [
            {
                from: from,
                to  : to
            }
        ];
        for (var i = 0; i < markers.length; i += 1) {
            var mk = markers[i],
                m  = mk.find(0);
            for (var j = 0; j < parts.length; j += 1) {
                var p = parts[j];
                if (cmp(p.to, m.from) < 0 || cmp(p.from, m.to) > 0) {
                    continue;
                }
                var newParts = [
                        j, 1
                    ],
                    dfrom    = cmp(p.from, m.from),
                    dto      = cmp(p.to, m.to);
                if (dfrom < 0 || !mk.inclusiveLeft && !dfrom) {
                    newParts.push({from: p.from, to: m.from});
                }
                if (dto > 0 || !mk.inclusiveRight && !dto) {
                    newParts.push({from: m.to, to: p.to});
                }
                parts
                    .splice
                    .apply(parts, newParts);
                j += newParts.length - 1;
            }
        }
        return parts;
    }

    // Connect or disconnect spans from a line.
    function detachMarkedSpans(line) {
        var spans = line.markedSpans;
        if (!spans) {
            return;
        }
        for (var i = 0; i < spans.length; i += 1) {
            spans[i]
                .marker
                .detachLine(line);
        }
        line.markedSpans = null;
    }
    function attachMarkedSpans(line, spans) {
        if (!spans) {
            return;
        }
        for (var i = 0; i < spans.length; i += 1) {
            spans[i]
                .marker
                .attachLine(line);
        }
        line.markedSpans = spans;
    }

    // Helpers used when computing which overlapping collapsed span counts as the
    // larger one.
    function extraLeft(marker) {
        return marker.inclusiveLeft
            ? -1
            : 0;
    }
    function extraRight(marker) {
        return marker.inclusiveRight
            ? 1
            : 0;
    }

    // Returns a number indicating which of two overlapping collapsed spans is
    // larger (and thus includes the other). Falls back to comparing ids when the
    // spans cover exactly the same range.
    function compareCollapsedMarkers(a, b) {
        var lenDiff = a.lines.length - b.lines.length;
        if (lenDiff != 0) {
            return lenDiff;
        }
        var aPos = a.find(),
            bPos = b.find();
        var fromCmp = cmp(aPos.from, bPos.from) || extraLeft(a) - extraLeft(b);
        if (fromCmp) {
            return -fromCmp;
        }
        var toCmp = cmp(aPos.to, bPos.to) || extraRight(a) - extraRight(b);
        if (toCmp) {
            return toCmp;
        }
        return b.id - a.id;
    }

    // Find out whether a line ends or starts in a collapsed span. If so, return the
    // marker for that span.
    function collapsedSpanAtSide(line, start) {
        var sps = sawCollapsedSpans && line.markedSpans,
            found;
        if (sps) {
            for (var sp, i = 0; i < sps.length; i += 1) {
                sp = sps[i];
                if (sp.marker.collapsed && (start
                    ? sp.from
                    : sp.to) == null && (!found || compareCollapsedMarkers(found, sp.marker) < 0)) {
                    found = sp.marker;
                }
            }
            return found;
        }
    }
    function collapsedSpanAtStart(line) {
        return collapsedSpanAtSide(line, true);
    }
    function collapsedSpanAtEnd(line) {
        return collapsedSpanAtSide(line, false);
    }

    // Test whether there exists a collapsed span that partially overlaps (covers
    // the start or end, but not both) of a new span. Such overlap is not allowed.
    function conflictingCollapsedRange(doc, lineNo, from, to, marker) {
        var line = getLine(doc, lineNo);
        var sps = sawCollapsedSpans && line.markedSpans;
        if (sps) {
            for (var i = 0; i < sps.length; i += 1) {
                var sp = sps[i];
                if (!sp.marker.collapsed) {
                    continue;
                }
                var found = sp
                    .marker
                    .find(0);
                var fromCmp = cmp(found.from, from) || extraLeft(sp.marker) - extraLeft(marker);
                var toCmp = cmp(found.to, to) || extraRight(sp.marker) - extraRight(marker);
                if (fromCmp >= 0 && toCmp <= 0 || fromCmp <= 0 && toCmp >= 0) {
                    continue;
                }
                if (fromCmp <= 0 && (cmp(found.to, from) > 0 || (sp.marker.inclusiveRight && marker.inclusiveLeft)) || fromCmp >= 0 && (cmp(found.from, to) < 0 || (sp.marker.inclusiveLeft && marker.inclusiveRight))) {
                    return true;
                }
            }
        }
    }

    // A visual line is a line as drawn on the screen. Folding, for example, can
    // cause multiple logical lines to appear on the same visual line. This finds
    // the start of the visual line that the given line is part of (usually that is
    // the line itself).
    function visualLine(line) {
        var merged;
        while (merged = collapsedSpanAtStart(line)) {
            line = merged
                .find(-1, true)
                .line;
        }
        return line;
    }

    // Returns an array of logical lines that continue the visual line started by
    // the argument, or undefined if there are no such lines.
    function visualLineContinued(line) {
        var merged,
            lines;
        while (merged = collapsedSpanAtEnd(line)) {
            line = merged
                .find(1, true)
                .line;
            (lines || (lines = [])).push(line);
        }
        return lines;
    }

    // Get the line number of the start of the visual line that the given line
    // number is part of.
    function visualLineNo(doc, lineN) {
        var line = getLine(doc, lineN),
            vis  = visualLine(line);
        if (line == vis) {
            return lineN;
        }
        return lineNo(vis);
    }
    // Get the line number of the start of the next visual line after the given
    // line.
    function visualLineEndNo(doc, lineN) {
        if (lineN > doc.lastLine()) {
            return lineN;
        }
        var line = getLine(doc, lineN),
            merged;
        if (!lineIsHidden(doc, line)) {
            return lineN;
        }
        while (merged = collapsedSpanAtEnd(line)) {
            line = merged
                .find(1, true)
                .line;
        }
        return lineNo(line) + 1;
    }

    // Compute whether a line is hidden. Lines count as hidden when they are part of
    // a visual line that starts with another line, or when they are entirely
    // covered by collapsed, non-widget span.
    function lineIsHidden(doc, line) {
        var sps = sawCollapsedSpans && line.markedSpans;
        if (sps) {
            for (var sp, i = 0; i < sps.length; i += 1) {
                sp = sps[i];
                if (!sp.marker.collapsed) {
                    continue;
                }
                if (sp.from == null) {
                    return true;
                }
                if (sp.marker.widgetNode) {
                    continue;
                }
                if (sp.from == 0 && sp.marker.inclusiveLeft && lineIsHiddenInner(doc, line, sp)) {
                    return true;
                }
            }
        }
    }
    function lineIsHiddenInner(doc, line, span) {
        if (span.to == null) {
            var end = span
                .marker
                .find(1, true);
            return lineIsHiddenInner(doc, end.line, getMarkedSpanFor(end.line.markedSpans, span.marker));
        }
        if (span.marker.inclusiveRight && span.to == line.text.length) {
            return true;
        }
        for (var sp, i = 0; i < line.markedSpans.length; i += 1) {
            sp = line.markedSpans[i];
            if (sp.marker.collapsed && !sp.marker.widgetNode && sp.from == span.to && (sp.to == null || sp.to != span.from) && (sp.marker.inclusiveLeft || span.marker.inclusiveRight) && lineIsHiddenInner(doc, line, sp)) {
                return true;
            }
        }
    }

    // LINE WIDGETS Line widgets are block elements displayed above or below a line.

    var LineWidget = codeMirror.LineWidget = function (cm, node, options) {
        if (options) {
            for (var opt in options) {
                if (options.hasOwnProperty(opt)) {
                    this[opt] = options[opt];
                }
            }
        }
        this.cm   = cm;
        this.node = node;
    };
    eventMixin(LineWidget);

    function adjustScrollWhenAboveVisible(cm, line, diff) {
        if (heightAtLine(line) < ((cm.curOp && cm.curOp.scrollTop) || cm.doc.scrollTop)) {
            addToScrollPos(cm, null, diff);
        }
    }

    LineWidget.prototype.clear   = function () {
        var cm   = this.cm,
            ws   = this.line.widgets,
            line = this.line,
            no   = lineNo(line);
        if (no == null || !ws) {
            return;
        }
        for (var i = 0; i < ws.length; i += 1) {
            if (ws[i] == this) {
                ws.splice(i--, 1);
            }
        }
        if (!ws.length) {
            line.widgets = null;
        }
        var height = widgetHeight(this);
        runInOp(cm, function () {
            adjustScrollWhenAboveVisible(cm, line, -height);
            regLineChange(cm, no, "widget");
            updateLineHeight(line, Math.max(0, line.height - height));
        });
    };
    LineWidget.prototype.changed = function () {
        var oldH = this.height,
            cm   = this.cm,
            line = this.line;
        this.height = null;
        var diff = widgetHeight(this) - oldH;
        if (!diff) {
            return;
        }
        runInOp(cm, function () {
            cm.curOp.forceUpdate = true;
            adjustScrollWhenAboveVisible(cm, line, diff);
            updateLineHeight(line, line.height + diff);
        });
    };

    function widgetHeight(widget) {
        if (widget.height != null) {
            return widget.height;
        }
        if (!contains(document.body, widget.node)) {
            var parentStyle = "position: relative;";
            if (widget.coverGutter) {
                parentStyle += "margin-left: -" + widget.cm.display.gutters.offsetWidth + "px;";
            }
            if (widget.noHScroll) {
                parentStyle += "width: " + widget.cm.display.wrapper.clientWidth + "px;";
            }
            removeChildrenAndAdd(widget.cm.display.measure, elt("div", [widget.node], null, parentStyle));
        }
        return widget.height = widget.node.offsetHeight;
    }

    function addLineWidget(cm, handle, node, options) {
        var widget = new LineWidget(cm, node, options);
        if (widget.noHScroll) {
            cm.display.alignWidgets = true;
        }
        changeLine(cm.doc, handle, "widget", function (line) {
            var widgets = line.widgets || (line.widgets = []);
            if (widget.insertAt == null) {
                widgets.push(widget);
            } else {
                widgets.splice(Math.min(widgets.length - 1, Math.max(0, widget.insertAt)), 0, widget);
            }
            widget.line = line;
            if (!lineIsHidden(cm.doc, line)) {
                var aboveVisible = heightAtLine(line) < cm.doc.scrollTop;
                updateLineHeight(line, line.height + widgetHeight(widget));
                if (aboveVisible) {
                    addToScrollPos(cm, null, widget.height);
                }
                cm.curOp.forceUpdate = true;
            }
            return true;
        });
        return widget;
    }

    // LINE DATA STRUCTURE Line objects. These hold state related to a line,
    // including highlighting info (the styles array).
    var Line = codeMirror.Line = function (text, markedSpans, estimateHeight) {
        this.text = text;
        attachMarkedSpans(this, markedSpans);
        this.height = estimateHeight
            ? estimateHeight(this)
            : 1;
    };
    eventMixin(Line);
    Line.prototype.lineNo = function () {
        return lineNo(this);
    };

    // Change the content (text, markers) of a line. Automatically invalidates
    // cached information and tries to re-estimate the line's height.
    function updateLine(line, text, markedSpans, estimateHeight) {
        line.text = text;
        if (line.stateAfter) {
            line.stateAfter = null;
        }
        if (line.styles) {
            line.styles = null;
        }
        if (line.order != null) {
            line.order = null;
        }
        detachMarkedSpans(line);
        attachMarkedSpans(line, markedSpans);
        var estHeight = estimateHeight
            ? estimateHeight(line)
            : 1;
        if (estHeight != line.height) {
            updateLineHeight(line, estHeight);
        }
    }

    // Detach a line from the document tree and its markers.
    function cleanUpLine(line) {
        line.parent = null;
        detachMarkedSpans(line);
    }

    function extractLineClasses(type, output) {
        if (type) {
            for (;;) {
                var lineClass = type.match(/(?:^|\s+)line-(background-)?(\S+)/);
                if (!lineClass) {
                    break;
                }
                type = type.slice(0, lineClass.index) + type.slice(lineClass.index + lineClass[0].length);
                var prop = lineClass[1]
                    ? "bgClass"
                    : "textClass";
                if (output[prop] == null) {
                    output[prop] = lineClass[2];
                } else if (!(new RegExp("(?:^|\s)" + lineClass[2] + "(?:$|\s)")).test(output[prop])) {
                    output[prop] += " " + lineClass[2];
                }
            }
            return type;
        }
    }

    function callBlankLine(mode, state) {
        if (mode.blankLine) {
            return mode.blankLine(state);
        }
        if (!mode.innerMode) {
            return;
        }
        var inner = codeMirror.innerMode(mode, state);
        if (inner.mode.blankLine) {
            return inner
                .mode
                .blankLine(inner.state);
        }
    }

    function readToken(mode, stream, state, inner) {
        for (var i = 0; i < 10; i += 1) {
            if (inner) {
                inner[0] = codeMirror
                    .innerMode(mode, state)
                    .mode;
            }
            var style = mode.token(stream, state);
            if (stream.pos > stream.start) {
                return style;
            }
        }
        throw new Error("Mode " + mode.name + " failed to advance stream.");
    }

    // Utility for getTokenAt and getLineTokens
    function takeToken(cm, pos, precise, asArray) {
        function getObj(copy) {
            return {
                end   : stream.pos,
                start : stream.start,
                state : copy
                    ? copyState(doc.mode, state)
                    : state,
                string: stream.current(),
                type  : style || null
            };
        }

        var doc  = cm.doc,
            mode = doc.mode,
            style;
        pos = clipPos(doc, pos);
        var line  = getLine(doc, pos.line),
            state = getStateBefore(cm, pos.line, precise);
        var stream = new StringStream(line.text, cm.options.tabSize),
            tokens;
        if (asArray) {
            tokens = [];
        }
        while ((asArray || stream.pos < pos.ch) && !stream.eol()) {
            stream.start = stream.pos;
            style        = readToken(mode, stream, state);
            if (asArray) {
                tokens.push(getObj(true));
            }
        }
        return asArray
            ? tokens
            : getObj();
    }

    // Run the given mode's parser over a line, calling f for each token.
    function runMode(cm, text, mode, state, f, lineClasses, forceToEnd) {
        var flattenSpans = mode.flattenSpans;
        if (flattenSpans == null) {
            flattenSpans = cm.options.flattenSpans;
        }
        var curStart = 0,
            curStyle = null;
        var stream = new StringStream(text, cm.options.tabSize),
            style;
        var inner = cm.options.addModeClass && [null];
        if (text == "") {
            extractLineClasses(callBlankLine(mode, state), lineClasses);
        }
        while (!stream.eol()) {
            if (stream.pos > cm.options.maxHighlightLength) {
                flattenSpans = false;
                if (forceToEnd) {
                    processLine(cm, text, state, stream.pos);
                }
                stream.pos = text.length;
                style      = null;
            } else {
                style = extractLineClasses(readToken(mode, stream, state, inner), lineClasses);
            }
            if (inner) {
                var mName = inner[0].name;
                if (mName) {
                    style = "m-" + (style
                        ? mName + " " + style
                        : mName);
                }
            }
            if (!flattenSpans || curStyle != style) {
                while (curStart < stream.start) {
                    curStart = Math.min(stream.start, curStart + 50000);
                    f(curStart, curStyle);
                }
                curStyle = style;
            }
            stream.start = stream.pos;
        }
        while (curStart < stream.pos) {
            // Webkit seems to refuse to render text nodes longer than 57444 characters
            var pos = Math.min(stream.pos, curStart + 50000);
            f(pos, curStyle);
            curStart = pos;
        }
    }

    // Compute a style array (an array starting with a mode generation -- for
    // invalidation -- followed by pairs of end positions and style strings), which
    // is used to highlight the tokens on the line.
    function highlightLine(cm, line, state, forceToEnd) {
        // A styles array always starts with a number identifying the mode/overlays that
        // it is based on (for easy invalidation).
        var st          = [cm.state.modeGen],
            lineClasses = {};
        // Compute the base array of styles
        runMode(cm, line.text, cm.doc.mode, state, function (end, style) {
            st.push(end, style);
        }, lineClasses, forceToEnd);

        // Run overlays, adjust style array.
        for (var o = 0; o < cm.state.overlays.length; o += 1) {
            var overlay = cm
                    .state
                    .overlays[o],
                i       = 1,
                at      = 0;
            runMode(cm, line.text, overlay.mode, true, function (end, style) {
                var start = i;
                // Ensure there's a token end at the current position, and that i points at it
                while (at < end) {
                    var i_end = st[i];
                    if (i_end > end) {
                        st.splice(i, 1, end, st[i + 1], i_end);
                    }
                    i  += 2;
                    at = Math.min(end, i_end);
                }
                if (!style) {
                    return;
                }
                if (overlay.opaque) {
                    st.splice(start, i - start, end, "cm-overlay " + style);
                    i = start + 2;
                } else {
                    for (; start < i; start += 2) {
                        var cur = st[start + 1];
                        st[start + 1] = (cur
                            ? cur + " "
                            : "") + "cm-overlay " + style;
                    }
                }
            }, lineClasses);
        }

        return {
            classes: lineClasses.bgClass || lineClasses.textClass
                ? lineClasses
                : null,
            styles : st
        };
    }

    function getLineStyles(cm, line, updateFrontier) {
        if (!line.styles || line.styles[0] != cm.state.modeGen) {
            var result = highlightLine(cm, line, line.stateAfter = getStateBefore(cm, lineNo(line)));
            line.styles = result.styles;
            if (result.classes) {
                line.styleClasses = result.classes;
            } else if (line.styleClasses) {
                line.styleClasses = null;
            }
            if (updateFrontier === cm.doc.frontier) {
                cm.doc.frontier += 1;
            }
        }
        return line.styles;
    }

    // Lightweight form of highlight -- proceed over this line and update state, but
    // don't save a style array. Used for lines that aren't currently visible.
    function processLine(cm, text, state, startAt) {
        var mode = cm.doc.mode;
        var stream = new StringStream(text, cm.options.tabSize);
        stream.start = stream.pos = startAt || 0;
        if (text == "") {
            callBlankLine(mode, state);
        }
        while (!stream.eol() && stream.pos <= cm.options.maxHighlightLength) {
            readToken(mode, stream, state);
            stream.start = stream.pos;
        }
    }

    // Convert a style as returned by a mode (either null, or a string containing
    // one or more styles) to a CSS style. This is cached, and also looks for
    // line-wide styles.
    var styleToClassCache         = {},
        styleToClassCacheWithMode = {};
    function interpretTokenStyle(style, options) {
        if (!style || /^\s*$/.test(style)) {
            return null;
        }
        var cache = options.addModeClass
            ? styleToClassCacheWithMode
            : styleToClassCache;
        return cache[style] || (cache[style] = style.replace(/\S+/g, "cm-$&"));
    }

    // Render the DOM representation of the text of a line. Also builds up a 'line
    // map', which points at the DOM nodes that represent specific stretches of
    // text, and is used by the measuring code. The returned object contains the DOM
    // node, this map, and information about line-wide styles that were set by the
    // mode.
    function buildLineContent(cm, lineView) {
        // The padding-right forces the element to have a 'border', which is needed on
        // Webkit to be able to get line-level bounding rectangles for it (in
        // measureChar).
        var content = elt("span", null, null, webkit
            ? "padding-right: .1px"
            : null);
        var builder = {
            cm     : cm,
            col    : 0,
            content: content,
            pos    : 0,
            pre    : elt("pre", [content])
        };
        lineView.measure = {};

        // Iterate over the logical lines that make up this visual line.
        for (var i = 0; i <= (lineView.rest
            ? lineView.rest.length
            : 0); i += 1) {
            var line = i
                    ? lineView.rest[i - 1]
                    : lineView.line,
                order;
            builder.pos      = 0;
            builder.addToken = buildToken;
            // Optionally wire in some hacks into the token-rendering algorithm, to deal
            // with browser quirks.
            if ((ie || webkit) && cm.getOption("lineWrapping")) {
                builder.addToken = buildTokenSplitSpaces(builder.addToken);
            }
            if (hasBadBidiRects(cm.display.measure) && (order = getOrder(line))) {
                builder.addToken = buildTokenBadBidi(builder.addToken, order);
            }
            builder.map = [];
            var allowFrontierUpdate = lineView != cm.display.externalMeasured && lineNo(line);
            insertLineContent(line, builder, getLineStyles(cm, line, allowFrontierUpdate));
            if (line.styleClasses) {
                if (line.styleClasses.bgClass) {
                    builder.bgClass = joinClasses(line.styleClasses.bgClass, builder.bgClass || "");
                }
                if (line.styleClasses.textClass) {
                    builder.textClass = joinClasses(line.styleClasses.textClass, builder.textClass || "");
                }
            }

            // Ensure at least a single node is present, for measuring.
            if (builder.map.length == 0) {
                builder
                    .map
                    .push(0, 0, builder.content.appendChild(zeroWidthElement(cm.display.measure)));
            }

            // Store the map and a cache object for the current logical line
            if (i == 0) {
                lineView.measure.map   = builder.map;
                lineView.measure.cache = {};
            } else {
                (lineView.measure.maps || (lineView.measure.maps = [])).push(builder.map);
                (lineView.measure.caches || (lineView.measure.caches = [])).push({});
            }
        }

        // See issue #2901
        if (webkit && /\bcm-tab\b/.test(builder.content.lastChild.className)) {
            builder.content.className = "cm-tab-wrap-hack";
        }

        signal(cm, "renderLine", cm, lineView.line, builder.pre);
        if (builder.pre.className) {
            builder.textClass = joinClasses(builder.pre.className, builder.textClass || "");
        }

        return builder;
    }

    function defaultSpecialCharPlaceholder(ch) {
        var token = elt("span", "\u2022", "cm-invalidchar");
        token.title = "\\u" + ch
            .charCodeAt(0)
            .toString(16);
        return token;
    }

    // Build up the DOM representation for a single token, and add it to the line
    // map. Takes care to render special characters separately.
    function buildToken(builder, text, style, startStyle, endStyle, title, css) {
        if (!text) {
            return;
        }
        var special  = builder.cm.options.specialChars,
            mustWrap = false;
        if (!special.test(text)) {
            builder.col += text.length;
            var content = document.createTextNode(text);
            builder
                .map
                .push(builder.pos, builder.pos + text.length, content);
            if (ie && ie_version < 9) {
                mustWrap = true;
            }
            builder.pos += text.length;
        } else {
            var content = document.createDocumentFragment(),
                pos     = 0;
            while (true) {
                special.lastIndex = pos;
                var m = special.exec(text);
                var skipped = m
                    ? m.index - pos
                    : text.length - pos;
                if (skipped) {
                    var txt = document.createTextNode(text.slice(pos, pos + skipped));
                    if (ie && ie_version < 9) {
                        content.appendChild(elt("span", [txt]));
                    } else {
                        content.appendChild(txt);
                    }
                    builder
                        .map
                        .push(builder.pos, builder.pos + skipped, txt);
                    builder.col += skipped;
                    builder.pos += skipped;
                }
                if (!m) {
                    break;
                }
                pos += skipped + 1;
                if (m[0] == "\t") {
                    var tabSize  = builder.cm.options.tabSize,
                        tabWidth = tabSize - builder.col % tabSize;
                    var txt = content.appendChild(elt("span", spaceStr(tabWidth), "cm-tab"));
                    builder.col += tabWidth;
                } else {
                    var txt = builder
                        .cm
                        .options
                        .specialCharPlaceholder(m[0]);
                    if (ie && ie_version < 9) {
                        content.appendChild(elt("span", [txt]));
                    } else {
                        content.appendChild(txt);
                    }
                    builder.col += 1;
                }
                builder
                    .map
                    .push(builder.pos, builder.pos + 1, txt);
                builder.pos += 1;
            }
        }
        if (style || startStyle || endStyle || mustWrap || css) {
            var fullStyle = style || "";
            if (startStyle) {
                fullStyle += startStyle;
            }
            if (endStyle) {
                fullStyle += endStyle;
            }
            var token = elt("span", [content], fullStyle, css);
            if (title) {
                token.title = title;
            }
            return builder
                .content
                .appendChild(token);
        }
        builder
            .content
            .appendChild(content);
    }

    function buildTokenSplitSpaces(inner) {
        function split(old) {
            var out = " ";
            for (var i = 0; i < old.length - 2; i += 1) {
                out += i % 2
                    ? " "
                    : "\u00a0";
            }
            out += " ";
            return out;
        }
        return function (builder, text, style, startStyle, endStyle, title) {
            inner(builder, text.replace(/ {3,}/g, split), style, startStyle, endStyle, title);
        };
    }

    // Work around nonsense dimensions being reported for stretches of right-to-left
    // text.
    function buildTokenBadBidi(inner, order) {
        return function (builder, text, style, startStyle, endStyle, title) {
            style = style
                ? style + " cm-force-border"
                : "cm-force-border";
            var start = builder.pos,
                end   = start + text.length;
            for (;;) {
                // Find the part that overlaps with the start of this text
                for (var i = 0; i < order.length; i += 1) {
                    var part = order[i];
                    if (part.to > start && part.from <= start) {
                        break;
                    }
                }
                if (part.to >= end) {
                    return inner(builder, text, style, startStyle, endStyle, title);
                }
                inner(builder, text.slice(0, part.to - start), style, startStyle, null, title);
                startStyle = null;
                text       = text.slice(part.to - start);
                start      = part.to;
            }
        };
    }

    function buildCollapsedSpan(builder, size, marker, ignoreWidget) {
        var widget = !ignoreWidget && marker.widgetNode;
        if (widget) {
            builder
                .map
                .push(builder.pos, builder.pos + size, widget);
            builder
                .content
                .appendChild(widget);
        }
        builder.pos += size;
    }

    // Outputs a number of spans to make up a line, taking highlighting and marked
    // text into account.
    function insertLineContent(line, builder, styles) {
        var spans   = line.markedSpans,
            allText = line.text,
            at      = 0;
        if (!spans) {
            for (var i = 1; i < styles.length; i += 2) {
                builder.addToken(builder, allText.slice(at, at = styles[i]), interpretTokenStyle(styles[i + 1], builder.cm.options));
            }
            return;
        }

        var len  = allText.length,
            pos  = 0,
            i    = 1,
            text = "",
            style,
            css;
        var nextChange = 0,
            spanStyle,
            spanEndStyle,
            spanStartStyle,
            title,
            collapsed;
        for (;;) {
            if (nextChange == pos) { // Update current marker set
                spanStyle  = spanEndStyle = spanStartStyle = title = css = "";
                collapsed  = null;
                nextChange = Infinity;
                var foundBookmarks = [];
                for (var j = 0; j < spans.length; j += 1) {
                    var sp = spans[j],
                        m  = sp.marker;
                    if (sp.from <= pos && (sp.to == null || sp.to > pos)) {
                        if (sp.to != null && nextChange > sp.to) {
                            nextChange   = sp.to;
                            spanEndStyle = "";
                        }
                        if (m.className) {
                            spanStyle += " " + m.className;
                        }
                        if (m.css) {
                            css = m.css;
                        }
                        if (m.startStyle && sp.from == pos) {
                            spanStartStyle += " " + m.startStyle;
                        }
                        if (m.endStyle && sp.to == nextChange) {
                            spanEndStyle += " " + m.endStyle;
                        }
                        if (m.title && !title) {
                            title = m.title;
                        }
                        if (m.collapsed && (!collapsed || compareCollapsedMarkers(collapsed.marker, m) < 0)) {
                            collapsed = sp;
                        }
                    } else if (sp.from > pos && nextChange > sp.from) {
                        nextChange = sp.from;
                    }
                    if (m.type == "bookmark" && sp.from == pos && m.widgetNode) {
                        foundBookmarks.push(m);
                    }
                }
                if (collapsed && (collapsed.from || 0) == pos) {
                    buildCollapsedSpan(builder, (collapsed.to == null
                        ? len + 1
                        : collapsed.to) - pos, collapsed.marker, collapsed.from == null);
                    if (collapsed.to == null) {
                        return;
                    }
                }
                if (!collapsed && foundBookmarks.length) {
                    for (var j = 0; j < foundBookmarks.length; j += 1) {
                        buildCollapsedSpan(builder, 0, foundBookmarks[j]);
                    }
                }
            }
            if (pos >= len) {
                break;
            }

            var upto = Math.min(len, nextChange);
            while (true) {
                if (text) {
                    var end = pos + text.length;
                    if (!collapsed) {
                        var tokenText = end > upto
                            ? text.slice(0, upto - pos)
                            : text;
                        builder.addToken(builder, tokenText, style
                            ? style + spanStyle
                            : spanStyle,
                        spanStartStyle,
                        pos + tokenText.length == nextChange
                            ? spanEndStyle
                            : "",
                        title,
                        css);
                    }
                    if (end >= upto) {
                        text = text.slice(upto - pos);
                        pos  = upto;
                        break;
                    }
                    pos            = end;
                    spanStartStyle = "";
                }
                text  = allText.slice(at, at = styles[i++]);
                style = interpretTokenStyle(styles[i++], builder.cm.options);
            }
        }
    }

    // DOCUMENT DATA STRUCTURE By default, updates that start and end at the
    // beginning of a line are treated specially, in order to make the association
    // of line widgets and marker elements with the text behave more intuitive.
    function isWholeLineUpdate(doc, change) {
        return change.from.ch == 0 && change.to.ch == 0 && lst(change.text) == "" && (!doc.cm || doc.cm.options.wholeLineUpdateBefore);
    }

    // Perform a change on the document data structure.
    function updateDoc(doc, change, markedSpans, estimateHeight) {
        function spansFor(n) {
            return markedSpans
                ? markedSpans[n]
                : null;
        }
        function update(line, text, spans) {
            updateLine(line, text, spans, estimateHeight);
            signalLater(line, "change", line, change);
        }
        function linesFor(start, end) {
            for (var i = start, result = []; i < end; i += 1) {
                result.push(new Line(text[i], spansFor(i), estimateHeight));
            }
            return result;
        }

        var from = change.from,
            to   = change.to,
            text = change.text;
        var firstLine = getLine(doc, from.line),
            lastLine  = getLine(doc, to.line);
        var lastText  = lst(text),
            lastSpans = spansFor(text.length - 1),
            nlines    = to.line - from.line;

        // Adjust the line structure
        if (change.full) {
            doc.insert(0, linesFor(0, text.length));
            doc.remove(text.length, doc.size - text.length);
        } else if (isWholeLineUpdate(doc, change)) {
            // This is a whole-line replace. Treated specially to make sure line objects
            // move the way they are supposed to.
            var added = linesFor(0, text.length - 1);
            update(lastLine, lastLine.text, lastSpans);
            if (nlines) {
                doc.remove(from.line, nlines);
            }
            if (added.length) {
                doc.insert(from.line, added);
            }
        } else if (firstLine == lastLine) {
            if (text.length == 1) {
                update(firstLine, firstLine.text.slice(0, from.ch) + lastText + firstLine.text.slice(to.ch), lastSpans);
            } else {
                var added = linesFor(1, text.length - 1);
                added.push(new Line(lastText + firstLine.text.slice(to.ch), lastSpans, estimateHeight));
                update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
                doc.insert(from.line + 1, added);
            }
        } else if (text.length == 1) {
            update(firstLine, firstLine.text.slice(0, from.ch) + text[0] + lastLine.text.slice(to.ch), spansFor(0));
            doc.remove(from.line + 1, nlines);
        } else {
            update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
            update(lastLine, lastText + lastLine.text.slice(to.ch), lastSpans);
            var added = linesFor(1, text.length - 1);
            if (nlines > 1) {
                doc.remove(from.line + 1, nlines - 1);
            }
            doc.insert(from.line + 1, added);
        }

        signalLater(doc, "change", doc, change);
    }

    // The document is represented as a BTree consisting of leaves, with chunk of
    // lines in them, and branches, with up to ten leaves or other branch nodes
    // below them. The top node is always a branch node, and is the document object
    // itself (meaning it has additional methods and properties).
    //
    // All nodes have parent links. The tree is used both to go from line numbers to
    // line objects, and to go from objects to numbers. It also indexes by height,
    // and is used to convert between height and line object, and to find the total
    // height of the document.
    //
    // See also http://marijnhaverbeke.nl/blog/codemirror-line-tree.html

    function LeafChunk(lines) {
        this.lines  = lines;
        this.parent = null;
        for (var i = 0, height = 0; i < lines.length; i += 1) {
            lines[i].parent = this;
            height          += lines[i].height;
        }
        this.height = height;
    }

    LeafChunk.prototype = {
        chunkSize  : function () {
            return this.lines.length;
        },
        // Helper used to collapse a small branch into a single leaf.
        collapse   : function (lines) {
            lines
                .push
                .apply(lines, this.lines);
        },
        // Insert the given array of lines at offset 'at', count them as having the
        // given height.
        insertInner: function (at, lines, height) {
            this.height += height;
            this.lines  = this
                .lines
                .slice(0, at)
                .concat(lines)
                .concat(this.lines.slice(at));
            for (var i = 0; i < lines.length; i += 1) {
                lines[i].parent = this;
            }
        },
        // Used to iterate over a part of the tree.
        iterN      : function (at, n, op) {
            for (var e = at + n; at < e; at += 1) {
                if (op(this.lines[at])) {
                    return true;
                }
            }
        },
        // Remove the n lines at offset 'at'.
        removeInner: function (at, n) {
            for (var i = at, e = at + n; i < e; i += 1) {
                var line = this.lines[i];
                this.height -= line.height;
                cleanUpLine(line);
                signalLater(line, "delete");
            }
            this
                .lines
                .splice(at, n);
        }
    };

    function BranchChunk(children) {
        this.children = children;
        var size   = 0,
            height = 0;
        for (var i = 0; i < children.length; i += 1) {
            var ch = children[i];
            size      += ch.chunkSize();
            height    += ch.height;
            ch.parent = this;
        }
        this.size   = size;
        this.height = height;
        this.parent = null;
    }

    BranchChunk.prototype = {
        chunkSize  : function () {
            return this.size;
        },
        collapse   : function (lines) {
            for (var i = 0; i < this.children.length; i += 1) {
                this
                    .children[i]
                    .collapse(lines);
            }
        },
        insertInner: function (at, lines, height) {
            this.size   += lines.length;
            this.height += height;
            for (var i = 0; i < this.children.length; i += 1) {
                var child = this.children[i],
                    sz    = child.chunkSize();
                if (at <= sz) {
                    child.insertInner(at, lines, height);
                    if (child.lines && child.lines.length > 50) {
                        while (child.lines.length > 50) {
                            var spilled = child
                                .lines
                                .splice(child.lines.length - 25, 25);
                            var newleaf = new LeafChunk(spilled);
                            child.height -= newleaf.height;
                            this
                                .children
                                .splice(i + 1, 0, newleaf);
                            newleaf.parent = this;
                        }
                        this.maybeSpill();
                    }
                    break;
                }
                at -= sz;
            }
        },
        iterN      : function (at, n, op) {
            for (var i = 0; i < this.children.length; i += 1) {
                var child = this.children[i],
                    sz    = child.chunkSize();
                if (at < sz) {
                    var used = Math.min(n, sz - at);
                    if (child.iterN(at, used, op)) {
                        return true;
                    }
                    if ((n -= used) == 0) {
                        break;
                    }
                    at = 0;
                } else {
                    at -= sz;
                }
            }
        },
        // When a node has grown, check whether it should be split.
        maybeSpill : function () {
            if (this.children.length <= 10) {
                return;
            }
            var me = this;
            do {
                var spilled = me
                    .children
                    .splice(me.children.length - 5, 5);
                var sibling = new BranchChunk(spilled);
                if (!me.parent) { // Become the parent node
                    var copy = new BranchChunk(me.children);
                    copy.parent = me;
                    me.children = [copy, sibling];
                    me          = copy;
                } else {
                    me.size   -= sibling.size;
                    me.height -= sibling.height;
                    var myIndex = indexOf(me.parent.children, me);
                    me
                        .parent
                        .children
                        .splice(myIndex + 1, 0, sibling);
                }
                sibling.parent = me.parent;
            } while (me.children.length > 10);
            me
                .parent
                .maybeSpill();
        },
        removeInner: function (at, n) {
            this.size -= n;
            for (var i = 0; i < this.children.length; i += 1) {
                var child = this.children[i],
                    sz    = child.chunkSize();
                if (at < sz) {
                    var rm        = Math.min(n, sz - at),
                        oldHeight = child.height;
                    child.removeInner(at, rm);
                    this.height -= oldHeight - child.height;
                    if (sz == rm) {
                        this
                            .children
                            .splice(i--, 1);
                        child.parent = null;
                    }
                    if ((n -= rm) == 0) {
                        break;
                    }
                    at = 0;
                } else {
                    at -= sz;
                }
            }
            // If the result is smaller than 25 lines, ensure that it is a single leaf node.
            if (this.size - n < 25 && (this.children.length > 1 || !(this.children[0] instanceof LeafChunk))) {
                var lines = [];
                this.collapse(lines);
                this.children = [new LeafChunk(lines)];
                this
                    .children[0]
                    .parent   = this;
            }
        }
    };

    var nextDocId = 0;
    var Doc = codeMirror.Doc = function (text, mode, firstLine) {
        if (!(this instanceof Doc)) {
            return new Doc(text, mode, firstLine);
        }
        if (firstLine == null) {
            firstLine = 0;
        }

        BranchChunk.call(this, [new LeafChunk([new Line("", null)])]);
        this.first           = firstLine;
        this.scrollTop       = this.scrollLeft = 0;
        this.cantEdit        = false;
        this.cleanGeneration = 1;
        this.frontier        = firstLine;
        var start = Pos(firstLine, 0);
        this.sel        = simpleSelection(start);
        this.history    = new History(null);
        this.id         = ++nextDocId;
        this.modeOption = mode;

        if (typeof text == "string") {
            text = splitLines(text);
        }
        updateDoc(this, {
            from: start,
            text: text,
            to  : start
        });
        setSelection(this, simpleSelection(start), sel_dontScroll);
    };

    Doc.prototype          = createObj(BranchChunk.prototype, {
        addLineClass            : docMethodOp(function (handle, where, cls) {
            return changeLine(this, handle, where == "gutter"
                ? "gutter"
                : "class",
            function (line) {
                var prop = where == "text"
                    ? "textClass"
                    : where == "background"
                        ? "bgClass"
                        : where == "gutter"
                            ? "gutterClass"
                            : "wrapClass";
                if (!line[prop]) {
                    line[prop] = cls;
                } else if (classTest(cls).test(line[prop])) {
                    return false;
                } else {
                    line[prop] += " " + cls;
                }
                return true;
            });
        }),
        addSelection            : docMethodOp(function (anchor, head, options) {
            var ranges = this
                .sel
                .ranges
                .slice(0);
            ranges.push(new Range(clipPos(this, anchor), clipPos(this, head || anchor)));
            setSelection(this, normalizeSelection(ranges, ranges.length - 1), options);
        }),
        changeGeneration        : function (forceSplit) {
            if (forceSplit) {
                this.history.lastOp = this.history.lastSelOp = this.history.lastOrigin = null;
            }
            return this.history.generation;
        },
        clearHistory            : function () {
            this.history = new History(this.history.maxGeneration);
        },

        clipPos                 : function (pos) {
            return clipPos(this, pos);
        },
        constructor             : Doc,

        copy                    : function (copyHistory) {
            var doc = new Doc(getLines(this, this.first, this.first + this.size), this.modeOption, this.first);
            doc.scrollTop  = this.scrollTop;
            doc.scrollLeft = this.scrollLeft;
            doc.sel        = this.sel;
            doc.extend     = false;
            if (copyHistory) {
                doc.history.undoDepth = this.history.undoDepth;
                doc.setHistory(this.getHistory());
            }
            return doc;
        },
        extendSelection         : docMethodOp(function (head, other, options) {
            extendSelection(this, clipPos(this, head), other && clipPos(this, other), options);
        }),
        extendSelections        : docMethodOp(function (heads, options) {
            extendSelections(this, clipPosArray(this, heads, options));
        }),
        extendSelectionsBy      : docMethodOp(function (f, options) {
            extendSelections(this, map(this.sel.ranges, f), options);
        }),
        findMarks               : function (from, to, filter) {
            from = clipPos(this, from);
            to   = clipPos(this, to);
            var found  = [],
                lineNo = from.line;
            this.iter(from.line, to.line + 1, function (line) {
                var spans = line.markedSpans;
                if (spans) {
                    for (var i = 0; i < spans.length; i += 1) {
                        var span = spans[i];
                        if (!(lineNo == from.line && from.ch > span.to || span.from == null && lineNo != from.line || lineNo == to.line && span.from > to.ch) && (!filter || filter(span.marker))) {
                            found.push(span.marker.parent || span.marker);
                        }
                    }
                    ++lineNo;
                }
            });
            return found;
        },
        findMarksAt             : function (pos) {
            pos = clipPos(this, pos);
            var markers = [],
                spans   = getLine(this, pos.line).markedSpans;
            if (spans) {
                for (var i = 0; i < spans.length; i += 1) {
                    var span = spans[i];
                    if ((span.from == null || span.from <= pos.ch) && (span.to == null || span.to >= pos.ch)) {
                        markers.push(span.marker.parent || span.marker);
                    }
                }
                return markers;
            }
        },
        firstLine               : function () {
            return this.first;
        },
        getAllMarks             : function () {
            var markers = [];
            this.iter(function (line) {
                var sps = line.markedSpans;
                if (sps) {
                    for (var i = 0; i < sps.length; i += 1) {
                        if (sps[i].from != null) {
                            markers.push(sps[i].marker);
                        }
                    }
                }
            });
            return markers;
        },

        getCursor               : function (start) {
            var range = this
                    .sel
                    .primary(),
                pos;
            if (start == null || start == "head") {
                pos = range.head;
            } else if (start == "anchor") {
                pos = range.anchor;
            } else if (start == "end" || start == "to" || start === false) {
                pos = range.to();
            } else {
                pos = range.from();
            }
            return pos;
        },
        getEditor               : function () {
            return this.cm;
        },
        getExtending            : function () {
            return this.extend;
        },

        getHistory              : function () {
            return {
                done  : copyHistoryArray(this.history.done),
                undone: copyHistoryArray(this.history.undone)
            };
        },

        getLine                 : function (line) {
            var l = this.getLineHandle(line);
            return l && l.text;
        },

        getLineHandle           : function (line) {
            if (isLine(this, line)) {
                return getLine(this, line);
            }
        },

        getLineHandleVisualStart: function (line) {
            if (typeof line == "number") {
                line = getLine(this, line);
            }
            return visualLine(line);
        },
        getLineNumber           : function (line) {
            return lineNo(line);
        },

        getMode                 : function () {
            return this.mode;
        },
        getRange                : function (from, to, lineSep) {
            var lines = getBetween(this, clipPos(this, from), clipPos(this, to));
            if (lineSep === false) {
                return lines;
            }
            return lines.join(lineSep || "\n");
        },

        getSelection            : function (lineSep) {
            var ranges = this.sel.ranges,
                lines;
            for (var i = 0; i < ranges.length; i += 1) {
                var sel = getBetween(this, ranges[i].from(), ranges[i].to());
                lines = lines
                    ? lines.concat(sel)
                    : sel;
            }
            if (lineSep === false) {
                return lines;
            } else {
                return lines.join(lineSep || "\n");
            }
        },
        getSelections           : function (lineSep) {
            var parts  = [],
                ranges = this.sel.ranges;
            for (var i = 0; i < ranges.length; i += 1) {
                var sel = getBetween(this, ranges[i].from(), ranges[i].to());
                if (lineSep !== false) {
                    sel = sel.join(lineSep || "\n");
                }
                parts[i] = sel;
            }
            return parts;
        },

        // From here, the methods are part of the public interface. Most are also
        // available from CodeMirror (editor) instances.

        getValue                : function (lineSep) {
            var lines = getLines(this, this.first, this.first + this.size);
            if (lineSep === false) {
                return lines;
            }
            return lines.join(lineSep || "\n");
        },

        historySize             : function () {
            var hist   = this.history,
                done   = 0,
                undone = 0;
            for (var i = 0; i < hist.done.length; i += 1) {
                if (!hist.done[i].ranges) {
                    ++done;
                }
            }
            for (var i = 0; i < hist.undone.length; i += 1) {
                if (!hist.undone[i].ranges) {
                    ++undone;
                }
            }
            return {redo: undone, undo: done};
        },
        indexFromPos            : function (coords) {
            coords = clipPos(this, coords);
            var index = coords.ch;
            if (coords.line < this.first || coords.ch < 0) {
                return 0;
            }
            this.iter(this.first, coords.line, function (line) {
                index += line.text.length + 1;
            });
            return index;
        },

        // Non-public interface for adding and removing lines.
        insert                  : function (at, lines) {
            var height = 0;
            for (var i = 0; i < lines.length; i += 1) {
                height += lines[i].height;
            }
            this.insertInner(at - this.first, lines, height);
        },
        isClean                 : function (gen) {
            return this.history.generation == (gen || this.cleanGeneration);
        },
        // Iterate over the document. Supports two forms -- with only one argument, it
        // calls that for each line in the document. With three, it iterates over the
        // range given by the first two (with the second being non-inclusive).
        iter                    : function (from, to, op) {
            if (op) {
                this.iterN(from - this.first, to - from, op);
            } else {
                this.iterN(this.first, this.first + this.size, from);
            }
        },
        iterLinkedDocs          : function (f) {
            linkedDocs(this, f);
        },
        lastLine                : function () {
            return this.first + this.size - 1;
        },

        lineCount               : function () {
            return this.size;
        },

        linkedDoc               : function (options) {
            if (!options) {
                options = {};
            }
            var from = this.first,
                to   = this.first + this.size;
            if (options.from != null && options.from > from) {
                from = options.from;
            }
            if (options.to != null && options.to < to) {
                to = options.to;
            }
            var copy = new Doc(getLines(this, from, to), options.mode || this.modeOption, from);
            if (options.sharedHist) {
                copy.history = this.history;
            }
            (this.linked || (this.linked = [])).push({doc: copy, sharedHist: options.sharedHist});
            copy.linked = [
                {
                    doc       : this,
                    isParent  : true,
                    sharedHist: options.sharedHist
                }
            ];
            copySharedMarkers(copy, findSharedMarkers(this));
            return copy;
        },
        listSelections          : function () {
            return this.sel.ranges;
        },

        markClean               : function () {
            this.cleanGeneration = this.changeGeneration(true);
        },

        markText                : function (from, to, options) {
            return markText(this, clipPos(this, from), clipPos(this, to), options, "range");
        },

        posFromIndex            : function (off) {
            var ch,
                lineNo = this.first;
            this.iter(function (line) {
                var sz = line.text.length + 1;
                if (sz > off) {
                    ch = off;
                    return true;
                }
                off    -= sz;
                lineNo += 1;
            });
            return clipPos(this, Pos(lineNo, ch));
        },
        redo                    : docMethodOp(function () {
            makeChangeFromHistory(this, "redo");
        }),
        redoSelection           : docMethodOp(function () {
            makeChangeFromHistory(this, "redo", true);
        }),
        remove                  : function (at, n) {
            this.removeInner(at - this.first, n);
        },
        removeLineClass         : docMethodOp(function (handle, where, cls) {
            return changeLine(this, handle, where == "gutter"
                ? "gutter"
                : "class",
            function (line) {
                var prop = where == "text"
                    ? "textClass"
                    : where == "background"
                        ? "bgClass"
                        : where == "gutter"
                            ? "gutterClass"
                            : "wrapClass";
                var cur = line[prop];
                if (!cur) {
                    return false;
                } else if (cls == null) {
                    line[prop] = null;
                } else {
                    var found = cur.match(classTest(cls));
                    if (!found) {
                        return false;
                    }
                    var end = found.index + found[0].length;
                    line[prop] = cur.slice(0, found.index) + (!found.index || end == cur.length
                        ? ""
                        : " ") + cur.slice(end) || null;
                }
                return true;
            });
        }),
        replaceRange            : function (code, from, to, origin) {
            from = clipPos(this, from);
            to   = to
                ? clipPos(this, to)
                : from;
            replaceRange(this, code, from, to, origin);
        },
        replaceSelection        : function (code, collapse, origin) {
            var dup = [];
            for (var i = 0; i < this.sel.ranges.length; i += 1) {
                dup[i] = code;
            }
            this.replaceSelections(dup, collapse, origin || "+input");
        },
        replaceSelections       : docMethodOp(function (code, collapse, origin) {
            var changes = [],
                sel     = this.sel;
            for (var i = 0; i < sel.ranges.length; i += 1) {
                var range = sel.ranges[i];
                changes[i] = {
                    from  : range.from(),
                    origin: origin,
                    text  : splitLines(code[i]),
                    to    : range.to()
                };
            }
            var newSel = collapse && collapse != "end" && computeReplacedSel(this, changes, collapse);
            for (var i = changes.length - 1; i >= 0; i -= 1) {
                makeChange(this, changes[i]);
            }
            if (newSel) {
                setSelectionReplaceHistory(this, newSel);
            } else if (this.cm) {
                ensureCursorVisible(this.cm);
            }
        }),
        setBookmark             : function (pos, options) {
            var realOpts = {
                clearWhenEmpty: false,
                insertLeft    : options && options.insertLeft,
                replacedWith  : options && (options.nodeType == null
                    ? options.widget
                    : options),
                shared        : options && options.shared
            };
            pos = clipPos(this, pos);
            return markText(this, pos, pos, realOpts, "bookmark");
        },

        setCursor               : docMethodOp(function (line, ch, options) {
            setSimpleSelection(this, clipPos(this, typeof line == "number"
                ? Pos(line, ch || 0)
                : line), null, options);
        }),

        setExtending            : function (val) {
            this.extend = val;
        },
        setHistory              : function (histData) {
            var hist = this.history = new History(this.history.maxGeneration);
            hist.done   = copyHistoryArray(histData.done.slice(0), null, true);
            hist.undone = copyHistoryArray(histData.undone.slice(0), null, true);
        },
        setSelection            : docMethodOp(function (anchor, head, options) {
            setSimpleSelection(this, clipPos(this, anchor), clipPos(this, head || anchor), options);
        }),
        setSelections           : docMethodOp(function (ranges, primary, options) {
            if (!ranges.length) {
                return;
            }
            for (var i = 0, out = []; i < ranges.length; i += 1) {
                out[i] = new Range(clipPos(this, ranges[i].anchor), clipPos(this, ranges[i].head));
            }
            if (primary == null) {
                primary = Math.min(ranges.length - 1, this.sel.primIndex);
            }
            setSelection(this, normalizeSelection(out, primary), options);
        }),
        setValue                : docMethodOp(function (code) {
            var top  = Pos(this.first, 0),
                last = this.first + this.size - 1;
            makeChange(this, {
                from  : top,
                full  : true,
                origin: "setValue",
                text  : splitLines(code),
                to    : Pos(last, getLine(this, last).text.length)
            }, true);
            setSelection(this, simpleSelection(top));
        }),
        somethingSelected       : function () {
            return this
                .sel
                .somethingSelected();
        },
        undo                    : docMethodOp(function () {
            makeChangeFromHistory(this, "undo");
        }),
        undoSelection           : docMethodOp(function () {
            makeChangeFromHistory(this, "undo", true);
        }),
        unlinkDoc               : function (other) {
            if (other instanceof codeMirror) {
                other = other.doc;
            }
            if (this.linked) {
                for (var i = 0; i < this.linked.length; i += 1) {
                    var link = this.linked[i];
                    if (link.doc != other) {
                        continue;
                    }
                    this
                        .linked
                        .splice(i, 1);
                    other.unlinkDoc(this);
                    detachSharedMarkers(findSharedMarkers(this));
                    break;
                }
            }
            // If the histories were shared, split them again
            if (other.history == this.history) {
                var splitIds = [other.id];
                linkedDocs(other, function (doc) {
                    splitIds.push(doc.id);
                }, true);
                other.history        = new History(null);
                other.history.done   = copyHistoryArray(this.history.done, splitIds);
                other.history.undone = copyHistoryArray(this.history.undone, splitIds);
            }
        }
    });

    // Public alias.
    Doc.prototype.eachLine = Doc.prototype.iter;

    // Set up methods on CodeMirror's prototype to redirect to the editor's
    // document.
    var dontDelegate = "iter insert remove copy getEditor".split(" ");
    for (var prop in Doc.prototype) {
        if (Doc.prototype.hasOwnProperty(prop) && indexOf(dontDelegate, prop) < 0) {
            codeMirror.prototype[prop] = (function (method) {
                return function () {
                    return method.apply(this.doc, arguments);
                };
            })(Doc.prototype[prop]);
        }
    }

    eventMixin(Doc);

    // Call f for all linked documents.
    function linkedDocs(doc, f, sharedHistOnly) {
        function propagate(doc, skip, sharedHist) {
            if (doc.linked) {
                for (var i = 0; i < doc.linked.length; i += 1) {
                    var rel = doc.linked[i];
                    if (rel.doc == skip) {
                        continue;
                    }
                    var shared = sharedHist && rel.sharedHist;
                    if (sharedHistOnly && !shared) {
                        continue;
                    }
                    f(rel.doc, shared);
                    propagate(rel.doc, doc, shared);
                }
            }
        }
        propagate(doc, null, true);
    }

    // Attach a document to an editor.
    function attachDoc(cm, doc) {
        if (doc.cm) {
            throw new Error("This document is already in use.");
        }
        cm.doc = doc;
        doc.cm = cm;
        estimateLineHeights(cm);
        loadMode(cm);
        if (!cm.options.lineWrapping) {
            findMaxLine(cm);
        }
        cm.options.mode = doc.modeOption;
        regChange(cm);
    }

    // LINE UTILITIES Find the line object corresponding to the given line number.
    function getLine(doc, n) {
        n -= doc.first;
        if (n < 0 || n >= doc.size) {
            throw new Error("There is no line " + (n + doc.first) + " in the document.");
        }
        for (var chunk = doc; !chunk.lines;) {
            for (var i = 0;; i += 1) {
                var child = chunk.children[i],
                    sz    = child.chunkSize();
                if (n < sz) {
                    chunk = child;
                    break;
                }
                n -= sz;
            }
        }
        return chunk.lines[n];
    }

    // Get the part of a document between two positions, as an array of strings.
    function getBetween(doc, start, end) {
        var out = [],
            n   = start.line;
        doc.iter(start.line, end.line + 1, function (line) {
            var text = line.text;
            if (n == end.line) {
                text = text.slice(0, end.ch);
            }
            if (n == start.line) {
                text = text.slice(start.ch);
            }
            out.push(text);
            n += 1;
        });
        return out;
    }
    // Get the lines between from and to, as array of strings.
    function getLines(doc, from, to) {
        var out = [];
        doc.iter(from, to, function (line) {
            out.push(line.text);
        });
        return out;
    }

    // Update the height of a line, propagating the height change upwards to parent
    // nodes.
    function updateLineHeight(line, height) {
        var diff = height - line.height;
        if (diff) {
            for (var n = line; n; n = n.parent) {
                n.height += diff;
            }
        }
    }

    // Given a line object, find its line number by walking up through its parent
    // links.
    function lineNo(line) {
        if (line.parent == null) {
            return null;
        }
        var cur = line.parent,
            no  = indexOf(cur.lines, line);
        for (var chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {
            for (var i = 0;; i += 1) {
                if (chunk.children[i] == cur) {
                    break;
                }
                no += chunk
                    .children[i]
                    .chunkSize();
            }
        }
        return no + cur.first;
    }

    // Find the line at the given vertical position, using the height information in
    // the document tree.
    function lineAtHeight(chunk, h) {
        var n = chunk.first;
        outer : do {
            for (var i = 0; i < chunk.children.length; i += 1) {
                var child = chunk.children[i],
                    ch    = child.height;
                if (h < ch) {
                    chunk = child;
                    continue outer;
                }
                h -= ch;
                n += child.chunkSize();
            }
            return n;
        } while (!chunk.lines);
        for (var i = 0; i < chunk.lines.length; i += 1) {
            var line = chunk.lines[i],
                lh   = line.height;
            if (h < lh) {
                break;
            }
            h -= lh;
        }
        return n + i;
    }


    // Find the height above the given line.
    function heightAtLine(lineObj) {
        lineObj = visualLine(lineObj);

        var h     = 0,
            chunk = lineObj.parent;
        for (var i = 0; i < chunk.lines.length; i += 1) {
            var line = chunk.lines[i];
            if (line == lineObj) {
                break;
            } else {
                h += line.height;
            }
        }
        for (var p = chunk.parent; p; chunk = p, p = chunk.parent) {
            for (var i = 0; i < p.children.length; i += 1) {
                var cur = p.children[i];
                if (cur == chunk) {
                    break;
                } else {
                    h += cur.height;
                }
            }
        }
        return h;
    }

    // Get the bidi ordering for the given line (and cache it). Returns false for
    // lines that are fully left-to-right, and an array of BidiSpan objects
    // otherwise.
    function getOrder(line) {
        var order = line.order;
        if (order == null) {
            order = line.order = bidiOrdering(line.text);
        }
        return order;
    }

    // HISTORY

    function History(startGen) {
        // Arrays of change events and selections. Doing something adds an event to done
        // and clears undo. Undoing moves events from done to undone, redoing moves them
        // in the other direction.
        this.done        = [];
        this.undone      = [];
        this.undoDepth   = Infinity;
        // Used to track when changes can be merged into a single undo event
        this.lastModTime = this.lastSelTime = 0;
        this.lastOp      = this.lastSelOp = null;
        this.lastOrigin  = this.lastSelOrigin = null;
        // Used by the isClean() method
        this.generation  = this.maxGeneration = startGen || 1;
    }

    // Create a history change event from an updateDoc-style change object.
    function historyChangeFromChange(doc, change) {
        var histChange = {
            from: copyPos(change.from),
            text: getBetween(doc, change.from, change.to),
            to  : changeEnd(change)
        };
        attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);
        linkedDocs(doc, function (doc) {
            attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);
        }, true);
        return histChange;
    }

    // Pop all selection events off the end of a history array. Stop at a change
    // event.
    function clearSelectionEvents(array) {
        while (array.length) {
            var last = lst(array);
            if (last.ranges) {
                array.pop();
            } else {
                break;
            }
        }
    }

    // Find the top change event in the history. Pop off selection events that are
    // in the way.
    function lastChangeEvent(hist, force) {
        if (force) {
            clearSelectionEvents(hist.done);
            return lst(hist.done);
        } else if (hist.done.length && !lst(hist.done).ranges) {
            return lst(hist.done);
        } else if (hist.done.length > 1 && !hist.done[hist.done.length - 2].ranges) {
            hist
                .done
                .pop();
            return lst(hist.done);
        }
    }

    // Register a change in the history. Merges changes that are within a single
    // operation, ore are close together with an origin that allows merging
    // (starting with "+") into a single event.
    function addChangeToHistory(doc, change, selAfter, opId) {
        var hist = doc.history;
        hist.undone.length = 0;
        var time = +new Date,
            cur;

        if ((hist.lastOp == opId || hist.lastOrigin == change.origin && change.origin && ((change.origin.charAt(0) == "+" && doc.cm && hist.lastModTime > time - doc.cm.options.historyEventDelay) || change.origin.charAt(0) == "*")) && (cur = lastChangeEvent(hist, hist.lastOp == opId))) {
            // Merge this change into the last event
            var last = lst(cur.changes);
            if (cmp(change.from, change.to) == 0 && cmp(change.from, last.to) == 0) {
                // Optimized case for simple insertion -- don't want to add new changesets for
                // every character typed
                last.to = changeEnd(change);
            } else {
                // Add new sub-event
                cur
                    .changes
                    .push(historyChangeFromChange(doc, change));
            }
        } else {
            // Can not be merged, start a new event.
            var before = lst(hist.done);
            if (!before || !before.ranges) {
                pushSelectionToHistory(doc.sel, hist.done);
            }
            cur = {
                changes   : [historyChangeFromChange(doc, change)],
                generation: hist.generation
            };
            hist
                .done
                .push(cur);
            while (hist.done.length > hist.undoDepth) {
                hist
                    .done
                    .shift();
                if (!hist.done[0].ranges) {
                    hist
                        .done
                        .shift();
                }
            }
        }
        hist
            .done
            .push(selAfter);
        hist.generation  = ++hist.maxGeneration;
        hist.lastModTime = hist.lastSelTime = time;
        hist.lastOp      = hist.lastSelOp = opId;
        hist.lastOrigin  = hist.lastSelOrigin = change.origin;

        if (!last) {
            signal(doc, "historyAdded");
        }
    }

    function selectionEventCanBeMerged(doc, origin, prev, sel) {
        var ch = origin.charAt(0);
        return ch == "*" || ch == "+" && prev.ranges.length == sel.ranges.length && prev.somethingSelected() == sel.somethingSelected() && new Date - doc.history.lastSelTime <= (doc.cm
            ? doc.cm.options.historyEventDelay
            : 500);
    }

    // Called whenever the selection changes, sets the new selection as the pending
    // selection in the history, and pushes the old pending selection into the
    // 'done' array when it was significantly different (in number of selected
    // ranges, emptiness, or time).
    function addSelectionToHistory(doc, sel, opId, options) {
        var hist   = doc.history,
            origin = options && options.origin;

        // A new event is started when the previous origin does not match the current,
        // or the origins don't allow matching. Origins starting with * are always
        // merged, those starting with + are merged when similar and close together in
        // time.
        if (opId == hist.lastSelOp || (origin && hist.lastSelOrigin == origin && (hist.lastModTime == hist.lastSelTime && hist.lastOrigin == origin || selectionEventCanBeMerged(doc, origin, lst(hist.done), sel)))) {
            hist.done[hist.done.length - 1] = sel;
        } else {
            pushSelectionToHistory(sel, hist.done);
        }

        hist.lastSelTime   = +new Date;
        hist.lastSelOrigin = origin;
        hist.lastSelOp     = opId;
        if (options && options.clearRedo !== false) {
            clearSelectionEvents(hist.undone);
        }
    }

    function pushSelectionToHistory(sel, dest) {
        var top = lst(dest);
        if (!(top && top.ranges && top.equals(sel))) {
            dest.push(sel);
        }
    }

    // Used to store marked span information in the history.
    function attachLocalSpans(doc, change, from, to) {
        var existing = change["spans_" + doc.id],
            n        = 0;
        doc.iter(Math.max(doc.first, from), Math.min(doc.first + doc.size, to), function (line) {
            if (line.markedSpans) {
                (existing || (existing = change["spans_" + doc.id] = {}))[n] = line.markedSpans;
            }
            ++n;
        });
    }

    // When un/re-doing restores text containing marked spans, those that have been
    // explicitly cleared should not be restored.
    function removeClearedSpans(spans) {
        if (!spans) {
            return null;
        }
        for (var i = 0, out; i < spans.length; i += 1) {
            if (spans[i].marker.explicitlyCleared) {
                if (!out) {
                    out = spans.slice(0, i);
                }
            } else if (out) {
                out.push(spans[i]);
            }
        }
        return !out
            ? spans
            : out.length
                ? out
                : null;
    }

    // Retrieve and filter the old marked spans stored in a change event.
    function getOldSpans(doc, change) {
        var found = change["spans_" + doc.id];
        if (!found) {
            return null;
        }
        for (var i = 0, nw = []; i < change.text.length; i += 1) {
            nw.push(removeClearedSpans(found[i]));
        }
        return nw;
    }

    // Used both to provide a JSON-safe object in .getHistory, and, when detaching a
    // document, to split the history in two
    function copyHistoryArray(events, newGroup, instantiateSel) {
        for (var i = 0, copy = []; i < events.length; i += 1) {
            var event = events[i];
            if (event.ranges) {
                copy.push(instantiateSel
                    ? Selection.prototype.deepCopy.call(event)
                    : event);
                continue;
            }
            var changes    = event.changes,
                newChanges = [];
            copy.push({changes: newChanges});
            for (var j = 0; j < changes.length; j += 1) {
                var change = changes[j],
                    m;
                newChanges.push({from: change.from, text: change.text, to: change.to});
                if (newGroup) {
                    for (var prop in change) {
                        if (m = prop.match(/^spans_(\d+)$/)) {
                            if (indexOf(newGroup, Number(m[1])) > -1) {
                                lst(newChanges)[prop] = change[prop];
                                delete change[prop];
                            }
                        }
                    }
                }
            }
        }
        return copy;
    }

    // Rebasing/resetting history to deal with externally-sourced changes

    function rebaseHistSelSingle(pos, from, to, diff) {
        if (to < pos.line) {
            pos.line += diff;
        } else if (from < pos.line) {
            pos.line = from;
            pos.ch   = 0;
        }
    }

    // Tries to rebase an array of history events given a change in the document. If
    // the change touches the same lines as the event, the event, and everything
    // 'behind' it, is discarded. If the change is before the event, the event's
    // positions are updated. Uses a copy-on-write scheme for the positions, to
    // avoid having to reallocate them all on every rebase, but also avoid problems
    // with shared position objects being unsafely updated.
    function rebaseHistArray(array, from, to, diff) {
        for (var i = 0; i < array.length; i += 1) {
            var sub = array[i],
                ok  = true;
            if (sub.ranges) {
                if (!sub.copied) {
                    sub        = array[i] = sub.deepCopy();
                    sub.copied = true;
                }
                for (var j = 0; j < sub.ranges.length; j += 1) {
                    rebaseHistSelSingle(sub.ranges[j].anchor, from, to, diff);
                    rebaseHistSelSingle(sub.ranges[j].head, from, to, diff);
                }
                continue;
            }
            for (var j = 0; j < sub.changes.length; j += 1) {
                var cur = sub.changes[j];
                if (to < cur.from.line) {
                    cur.from = Pos(cur.from.line + diff, cur.from.ch);
                    cur.to   = Pos(cur.to.line + diff, cur.to.ch);
                } else if (from <= cur.to.line) {
                    ok = false;
                    break;
                }
            }
            if (!ok) {
                array.splice(0, i + 1);
                i = 0;
            }
        }
    }

    function rebaseHist(hist, change) {
        var from = change.from.line,
            to   = change.to.line,
            diff = change.text.length - (to - from) - 1;
        rebaseHistArray(hist.done, from, to, diff);
        rebaseHistArray(hist.undone, from, to, diff);
    }

    // EVENT UTILITIES Due to the fact that we still support jurassic IE versions,
    // some compatibility wrappers are needed.

    var e_preventDefault = codeMirror.e_preventDefault = function (e) {
        if (e.preventDefault) {
            e.preventDefault();
        } else {
            e.returnValue = false;
        }
    };
    var e_stopPropagation = codeMirror.e_stopPropagation = function (e) {
        if (e.stopPropagation) {
            e.stopPropagation();
        } else {
            e.cancelBubble = true;
        }
    };
    function e_defaultPrevented(e) {
        return e.defaultPrevented != null
            ? e.defaultPrevented
            : e.returnValue == false;
    }
    var e_stop = codeMirror.e_stop = function (e) {
        e_preventDefault(e);
        e_stopPropagation(e);
    };

    function e_target(e) {
        return e.target || e.srcElement;
    }
    function e_button(e) {
        var b = e.which;
        if (b == null) {
            if (e.button & 1) {
                b = 1;
            } else if (e.button & 2) {
                b = 3;
            } else if (e.button & 4) {
                b = 2;
            }
        }
        if (mac && e.ctrlKey && b == 1) {
            b = 3;
        }
        return b;
    }

    // EVENT HANDLING Lightweight event framework. on/off also work on DOM nodes,
    // registering native DOM handlers.

    var on = codeMirror.on = function (emitter, type, f) {
        if (emitter.addEventListener) {
            emitter.addEventListener(type, f, false);
        } else if (emitter.attachEvent) {
            emitter.attachEvent("on" + type, f);
        } else {
            var map = emitter._handlers || (emitter._handlers = {});
            var arr = map[type] || (map[type] = []);
            arr.push(f);
        }
    };

    var off = codeMirror.off = function (emitter, type, f) {
        if (emitter.removeEventListener) {
            emitter.removeEventListener(type, f, false);
        } else if (emitter.detachEvent) {
            emitter.detachEvent("on" + type, f);
        } else {
            var arr = emitter._handlers && emitter._handlers[type];
            if (!arr) {
                return;
            }
            for (var i = 0; i < arr.length; i += 1) {
                if (arr[i] == f) {
                    arr.splice(i, 1);
                    break;
                }
            }
        }
    };

    var signal = codeMirror.signal = function (emitter, type/*, values...*/) {
        var arr = emitter._handlers && emitter._handlers[type];
        if (!arr) {
            return;
        }
        var args = Array
            .prototype
            .slice
            .call(arguments, 2);
        for (var i = 0; i < arr.length; i += 1) {
            arr[i].apply(null, args);
        };
    }

    var orphanDelayedCallbacks = null;

    // Often, we want to signal events at a point where we are in the middle of some
    // work, but don't want the handler to start calling other methods on the
    // editor, which might be in an inconsistent state or simply not expect any
    // other events to happen. signalLater looks whether there are any handlers, and
    // schedules them to be executed when the last operation ends, or, if no
    // operation is active, when a timeout fires.
    function signalLater(emitter, type/*, values...*/) {
        var arr = emitter._handlers && emitter._handlers[type];
        if (!arr) {
            return;
        }
        var args = Array
                .prototype
                .slice
                .call(arguments, 2),
            list;
        if (operationGroup) {
            list = operationGroup.delayedCallbacks;
        } else if (orphanDelayedCallbacks) {
            list = orphanDelayedCallbacks;
        } else {
            list = orphanDelayedCallbacks = [];
            setTimeout(fireOrphanDelayed, 0);
        }
        function bnd(f) {
            return function () {
                f.apply(null, args);
            };
        };
        for (var i = 0; i < arr.length; i += 1) {
            list.push(bnd(arr[i]));
        }
    }

    function fireOrphanDelayed() {
        var delayed = orphanDelayedCallbacks;
        orphanDelayedCallbacks = null;
        for (var i = 0; i < delayed.length; i += 1) {
            delayed[i]();
        }
    }

    // The DOM events that CodeMirror handles can be overridden by registering a
    // (non-DOM) handler on the editor for the event name, and preventDefault-ing
    // the event in that handler.
    function signalDOMEvent(cm, e, override) {
        if (typeof e == "string") {
            e = {
                preventDefault: function () {
                    this.defaultPrevented = true;
                },
                type          : e
            };
        }
        signal(cm, override || e.type, cm, e);
        return e_defaultPrevented(e) || e.codemirrorIgnore;
    }

    function signalCursorActivity(cm) {
        var arr = cm._handlers && cm._handlers.cursorActivity;
        if (!arr) {
            return;
        }
        var set = cm.curOp.cursorActivityHandlers || (cm.curOp.cursorActivityHandlers = []);
        for (var i = 0; i < arr.length; i += 1) {
            if (indexOf(set, arr[i]) == -1) {
                set.push(arr[i]);
            }
        }
    }

    function hasHandler(emitter, type) {
        var arr = emitter._handlers && emitter._handlers[type];
        return arr && arr.length > 0;
    }

    // Add on and off methods to a constructor's prototype, to make registering
    // events on such objects more convenient.
    function eventMixin(ctor) {
        ctor.prototype.on  = function (type, f) {
            on(this, type, f);
        };
        ctor.prototype.off = function (type, f) {
            off(this, type, f);
        };
    }

    // MISC UTILITIES Number of pixels added to scroller and sizer to hide scrollbar
    var scrollerGap = 30;

    // Returned or thrown by various protocols to signal 'I'm not handling this'.
    var Pass = codeMirror.Pass = {
        toString: function () {
            return "CodeMirror.Pass";
        }
    };

    // Reused option objects for setSelection & friends
    var sel_dontScroll = {
            scroll: false
        },
        sel_mouse      = {
            origin: "*mouse"
        },
        sel_move       = {
            origin: "+move"
        };

    function Delayed() {
        this.id = null;
    }
    Delayed.prototype.set = function (ms, f) {
        clearTimeout(this.id);
        this.id = setTimeout(f, ms);
    };

    // Counts the column offset in a string, taking tabs into account. Used mostly
    // to find indentation.
    var countColumn = codeMirror.countColumn = function (string, end, tabSize, startIndex, startValue) {
        if (end == null) {
            end = string.search(/[^\s\u00a0]/);
            if (end == -1) {
                end = string.length;
            }
        }
        for (var i = startIndex || 0, n = startValue || 0;;) {
            var nextTab = string.indexOf("\t", i);
            if (nextTab < 0 || nextTab >= end) {
                return n + (end - i);
            }
            n += nextTab - i;
            n += tabSize - (n % tabSize);
            i = nextTab + 1;
        }
    };

    // The inverse of countColumn -- find the offset that corresponds to a
    // particular column.
    function findColumn(string, goal, tabSize) {
        for (var pos = 0, col = 0;;) {
            var nextTab = string.indexOf("\t", pos);
            if (nextTab == -1) {
                nextTab = string.length;
            }
            var skipped = nextTab - pos;
            if (nextTab == string.length || col + skipped >= goal) {
                return pos + Math.min(skipped, goal - col);
            }
            col += nextTab - pos;
            col += tabSize - (col % tabSize);
            pos = nextTab + 1;
            if (col >= goal) {
                return pos;
            }
        }
    }

    var spaceStrs = [""];
    function spaceStr(n) {
        while (spaceStrs.length <= n) {
            spaceStrs.push(lst(spaceStrs) + " ");
        }
        return spaceStrs[n];
    }

    function lst(arr) {
        return arr[arr.length - 1];
    }

    var selectInput = function (node) {
        node.select();
    };
    if (ios) { // Mobile Safari apparently has a bug where select() is broken.
        selectInput = function (node) {
            node.selectionStart = 0;
            node.selectionEnd   = node.value.length;
        };
    } else if (ie) { // Suppress mysterious IE10 errors
        selectInput = function (node) {
            try {
                node.select();
            } catch (_e) {}
        };
    }

    function indexOf(array, elt) {
        for (var i = 0; i < array.length; i += 1) {
            if (array[i] == elt) {
                return i;
            }
        }
        return -1;
    }
    function map(array, f) {
        var out = [];
        for (var i = 0; i < array.length; i += 1) {
            out[i] = f(array[i], i);
        }
        return out;
    }

    function createObj(base, props) {
        var inst;
        if (Object.create) {
            inst = Object.create(base);
        } else {
            var ctor = function () {};
            ctor.prototype = base;
            inst           = new ctor();
        }
        if (props) {
            copyObj(props, inst);
        }
        return inst;
    };

    function copyObj(obj, target, overwrite) {
        if (!target) {
            target = {};
        }
        for (var prop in obj) {
            if (obj.hasOwnProperty(prop) && (overwrite !== false || !target.hasOwnProperty(prop))) {
                target[prop] = obj[prop];
            }
        }
        return target;
    }

    function bind(f) {
        var args = Array
            .prototype
            .slice
            .call(arguments, 1);
        return function () {
            return f.apply(null, args);
        };
    }

    var nonASCIISingleCaseWordChar = /[\u00df\u0590-\u05f4\u0600-\u06ff\u3040-\u309f\u30a0-\u30ff\u3400-\u4db5\u4e00-\u9fcc\uac00-\ud7af]/;
    var isWordCharBasic = codeMirror.isWordChar = function (ch) {
        return /\w/.test(ch) || ch > "\x80" && (ch.toUpperCase() != ch.toLowerCase() || nonASCIISingleCaseWordChar.test(ch));
    };
    function isWordChar(ch, helper) {
        if (!helper) {
            return isWordCharBasic(ch);
        }
        if (helper.source.indexOf("\\w") > -1 && isWordCharBasic(ch)) {
            return true;
        }
        return helper.test(ch);
    }

    function isEmpty(obj) {
        for (var n in obj) {
            if (obj.hasOwnProperty(n) && obj[n]) {
                return false;
            }
        }
        return true;
    }

    // Extending unicode characters. A series of a non-extending char + any number
    // of extending chars is treated as a single unit as far as editing and
    // measuring is concerned. This is not fully correct, since some
    // scripts/fonts/browsers also treat other configurations of code points as a
    // group.
    var extendingChars = /[\u0300-\u036f\u0483-\u0489\u0591-\u05bd\u05bf\u05c1\u05c2\u05c4\u05c5\u05c7\u0610-\u061a\u064b-\u065e\u0670\u06d6-\u06dc\u06de-\u06e4\u06e7\u06e8\u06ea-\u06ed\u0711\u0730-\u074a\u07a6-\u07b0\u07eb-\u07f3\u0816-\u0819\u081b-\u0823\u0825-\u0827\u0829-\u082d\u0900-\u0902\u093c\u0941-\u0948\u094d\u0951-\u0955\u0962\u0963\u0981\u09bc\u09be\u09c1-\u09c4\u09cd\u09d7\u09e2\u09e3\u0a01\u0a02\u0a3c\u0a41\u0a42\u0a47\u0a48\u0a4b-\u0a4d\u0a51\u0a70\u0a71\u0a75\u0a81\u0a82\u0abc\u0ac1-\u0ac5\u0ac7\u0ac8\u0acd\u0ae2\u0ae3\u0b01\u0b3c\u0b3e\u0b3f\u0b41-\u0b44\u0b4d\u0b56\u0b57\u0b62\u0b63\u0b82\u0bbe\u0bc0\u0bcd\u0bd7\u0c3e-\u0c40\u0c46-\u0c48\u0c4a-\u0c4d\u0c55\u0c56\u0c62\u0c63\u0cbc\u0cbf\u0cc2\u0cc6\u0ccc\u0ccd\u0cd5\u0cd6\u0ce2\u0ce3\u0d3e\u0d41-\u0d44\u0d4d\u0d57\u0d62\u0d63\u0dca\u0dcf\u0dd2-\u0dd4\u0dd6\u0ddf\u0e31\u0e34-\u0e3a\u0e47-\u0e4e\u0eb1\u0eb4-\u0eb9\u0ebb\u0ebc\u0ec8-\u0ecd\u0f18\u0f19\u0f35\u0f37\u0f39\u0f71-\u0f7e\u0f80-\u0f84\u0f86\u0f87\u0f90-\u0f97\u0f99-\u0fbc\u0fc6\u102d-\u1030\u1032-\u1037\u1039\u103a\u103d\u103e\u1058\u1059\u105e-\u1060\u1071-\u1074\u1082\u1085\u1086\u108d\u109d\u135f\u1712-\u1714\u1732-\u1734\u1752\u1753\u1772\u1773\u17b7-\u17bd\u17c6\u17c9-\u17d3\u17dd\u180b-\u180d\u18a9\u1920-\u1922\u1927\u1928\u1932\u1939-\u193b\u1a17\u1a18\u1a56\u1a58-\u1a5e\u1a60\u1a62\u1a65-\u1a6c\u1a73-\u1a7c\u1a7f\u1b00-\u1b03\u1b34\u1b36-\u1b3a\u1b3c\u1b42\u1b6b-\u1b73\u1b80\u1b81\u1ba2-\u1ba5\u1ba8\u1ba9\u1c2c-\u1c33\u1c36\u1c37\u1cd0-\u1cd2\u1cd4-\u1ce0\u1ce2-\u1ce8\u1ced\u1dc0-\u1de6\u1dfd-\u1dff\u200c\u200d\u20d0-\u20f0\u2cef-\u2cf1\u2de0-\u2dff\u302a-\u302f\u3099\u309a\ua66f-\ua672\ua67c\ua67d\ua6f0\ua6f1\ua802\ua806\ua80b\ua825\ua826\ua8c4\ua8e0-\ua8f1\ua926-\ua92d\ua947-\ua951\ua980-\ua982\ua9b3\ua9b6-\ua9b9\ua9bc\uaa29-\uaa2e\uaa31\uaa32\uaa35\uaa36\uaa43\uaa4c\uaab0\uaab2-\uaab4\uaab7\uaab8\uaabe\uaabf\uaac1\uabe5\uabe8\uabed\udc00-\udfff\ufb1e\ufe00-\ufe0f\ufe20-\ufe26\uff9e\uff9f]/;
    function isExtendingChar(ch) {
        return ch.charCodeAt(0) >= 768 && extendingChars.test(ch);
    }

    // DOM UTILITIES

    function elt(tag, content, className, style) {
        var e = document.createElement(tag);
        if (className) {
            e.className = className;
        }
        if (style) {
            e.style.cssText = style;
        }
        if (typeof content == "string") {
            e.appendChild(document.createTextNode(content));
        } else if (content) {
            for (var i = 0; i < content.length; i += 1) {
                e.appendChild(content[i]);
            }
        }
        return e;
    }

    var range;
    if (document.createRange) {
        range = function (node, start, end) {
            var r = document.createRange();
            r.setEnd(node, end);
            r.setStart(node, start);
            return r;
        };
    } else {
        range = function (node, start, end) {
            var r = document
                .body
                .createTextRange();
            try {
                r.moveToElementText(node.parentNode);
            } catch (e) {
                return r;
            }
            r.collapse(true);
            r.moveEnd("character", end);
            r.moveStart("character", start);
            return r;
        };
    }

    function removeChildren(e) {
        for (var count = e.childNodes.length; count > 0; count -= 1) {
            e.removeChild(e.firstChild);
        }
        return e;
    }

    function removeChildrenAndAdd(parent, e) {
        return removeChildren(parent).appendChild(e);
    }

    function contains(parent, child) {
        if (parent.contains) {
            return parent.contains(child);
        }
        while (child = child.parentNode) {
            if (child == parent) {
                return true;
            }
        }
    }

    function activeElt() {
        return document.activeElement;
    }
    // Older versions of IE throws unspecified error when touching
    // document.activeElement in some cases (during loading, in iframe)
    if (ie && ie_version < 11) {
        activeElt = function () {
            try {
                return document.activeElement;
            } catch (e) {
                return document.body;
            }
        };
    }

    function classTest(cls) {
        return new RegExp("(^|\\s)" + cls + "(?:$|\\s)\\s*");
    }
    var rmClass = codeMirror.rmClass = function (node, cls) {
        var current = node.className;
        var match = classTest(cls).exec(current);
        if (match) {
            var after = current.slice(match.index + match[0].length);
            node.className = current.slice(0, match.index) + (after
                ? match[1] + after
                : "");
        }
    };
    var addClass = codeMirror.addClass = function (node, cls) {
        var current = node.className;
        if (!classTest(cls).test(current)) {
            node.className += (current
                ? " "
                : "") + cls;
        };
    }
    function joinClasses(a, b) {
        var as = a.split(" ");
        for (var i = 0; i < as.length; i += 1) {
            if (as[i] && !classTest(as[i]).test(b)) {
                b += " " + as[i];
            }
        }
        return b;
    }

    // WINDOW-WIDE EVENTS These must be handled carefully, because naively
    // registering a handler for each editor will cause the editors to never be
    // garbage collected.

    function forEachCodeMirror(f) {
        if (!document.body.getElementsByClassName) {
            return;
        }
        var byClass = document
            .body
            .getElementsByClassName("CodeMirror");
        for (var i = 0; i < byClass.length; i += 1) {
            var cm = byClass[i].CodeMirror;
            if (cm) {
                f(cm);
            }
        }
    }

    var globalsRegistered = false;
    function ensureGlobalHandlers() {
        if (globalsRegistered) {
            return;
        }
        registerGlobalHandlers();
        globalsRegistered = true;
    }
    function registerGlobalHandlers() {
        // When the window resizes, we need to refresh active editors.
        var resizeTimer;
        on(window, "resize", function () {
            if (resizeTimer == null) {
                resizeTimer = setTimeout(function () {
                    resizeTimer = null;
                    forEachCodeMirror(onResize);
                }, 100);
            }
        });
        // When the window loses focus, we want to show the editor as blurred
        on(window, "blur", function () {
            forEachCodeMirror(onBlur);
        });
    }

    // FEATURE DETECTION Detect drag-and-drop
    var dragAndDrop = function () {
        // There is *some* kind of drag-and-drop support in IE6-8, but I couldn't get it
        // to work yet.
        if (ie && ie_version < 9) {
            return false;
        }
        var div = elt("div");
        return "draggable" in div || "dragDrop" in div;
    }();

    var zwspSupported;
    function zeroWidthElement(measure) {
        if (zwspSupported == null) {
            var test = elt("span", "\u200b");
            removeChildrenAndAdd(measure, elt("span", [test, document.createTextNode("x")]));
            if (measure.firstChild.offsetHeight != 0) {
                zwspSupported = test.offsetWidth <= 1 && test.offsetHeight > 2 && !(ie && ie_version < 8);
            }
        }
        if (zwspSupported) {
            return elt("span", "\u200b");
        } else {
            return elt("span", "\u00a0", null, "display: inline-block; width: 1px; margin-right: -1px");
        }
    }

    // Feature-detect IE's crummy client rect reporting for bidi text
    var badBidiRects;
    function hasBadBidiRects(measure) {
        if (badBidiRects != null) {
            return badBidiRects;
        }
        var txt = removeChildrenAndAdd(measure, document.createTextNode("A\u062eA"));
        var r0 = range(txt, 0, 1).getBoundingClientRect();
        if (!r0 || r0.left == r0.right) {
            return false; // Safari returns null in some cases (#2780)
        }
        var r1 = range(txt, 1, 2).getBoundingClientRect();
        return badBidiRects = (r1.right - r0.right < 3);
    }

    // See if "".split is the broken IE version, if so, provide an alternative way
    // to split lines.
    var splitLines = codeMirror.splitLines = "\n\nb"
        .split(/\n/)
        .length != 3
            ? function (string) {
                var pos    = 0,
                    result = [],
                    l      = string.length;
                while (pos <= l) {
                    var nl = string.indexOf("\n", pos);
                    if (nl == -1) {
                        nl = string.length;
                    }
                    var line = string.slice(pos, string.charAt(nl - 1) == "\r"
                        ? nl - 1
                        : nl);
                    var rt = line.indexOf("\r");
                    if (rt != -1) {
                        result.push(line.slice(0, rt));
                        pos += rt + 1;
                    } else {
                        result.push(line);
                        pos = nl + 1;
                    }
                }
                return result;
            }
            : function (string) {
                return string.split(/\r\n?|\n/);
            };

    var hasSelection = window.getSelection
        ? function (te) {
            try {
                return te.selectionStart != te.selectionEnd;
            } catch (e) {
                return false;
            }
        }
        : function (te) {
            try {
                var range = te
                    .ownerDocument
                    .selection
                    .createRange();
            } catch (e) {}
            if (!range || range.parentElement() != te) {
                return false;
            }
            return range.compareEndPoints("StartToEnd", range) != 0;
        };

    var hasCopyEvent = (function () {
        var e = elt("div");
        if ("oncopy" in e) {
            return true;
        }
        e.setAttribute("oncopy", "return;");
        return typeof e.oncopy == "function";
    })();

    var badZoomedRects = null;
    function hasBadZoomedRects(measure) {
        if (badZoomedRects != null) {
            return badZoomedRects;
        }
        var node = removeChildrenAndAdd(measure, elt("span", "x"));
        var normal = node.getBoundingClientRect();
        var fromRange = range(node, 0, 1).getBoundingClientRect();
        return badZoomedRects = Math.abs(normal.left - fromRange.left) > 1;
    }

    // KEY NAMES

    var keyNames = {
        107  : "=",
        109  : "-",
        127  : "Delete",
        13   : "Enter",
        16   : "Shift",
        17   : "Ctrl",
        173  : "-",
        18   : "Alt",
        186  : ";",
        187  : "=",
        188  : ",",
        189  : "-",
        19   : "Pause",
        190  : ".",
        191  : "/",
        192  : "`",
        20   : "CapsLock",
        219  : "[",
        220  : "\\",
        221  : "]",
        222  : "'",
        27   : "Esc",
        3    : "Enter",
        32   : "Space",
        33   : "PageUp",
        34   : "PageDown",
        35   : "End",
        36   : "Home",
        37   : "Left",
        38   : "Up",
        39   : "Right",
        40   : "Down",
        44   : "PrintScrn",
        45   : "Insert",
        46   : "Delete",
        59   : ";",
        61   : "=",
        63232: "Up",
        63233: "Down",
        63234: "Left",
        63235: "Right",
        63272: "Delete",
        63273: "Home",
        63275: "End",
        63276: "PageUp",
        63277: "PageDown",
        63302: "Insert",
        8    : "Backspace",
        9    : "Tab",
        91   : "Mod",
        92   : "Mod",
        93   : "Mod"
    };
    codeMirror.keyNames = keyNames;
    (function () {
        // Number keys
        for (var i = 0; i < 10; i += 1) {
            keyNames[i + 48] = keyNames[i + 96] = String(i);
        }
        // Alphabetic keys
        for (var i = 65; i <= 90; i += 1) {
            keyNames[i] = String.fromCharCode(i);
        }
        // Function keys
        for (var i = 1; i <= 12; i += 1) {
            keyNames[i + 111] = keyNames[i + 63235] = "F" + i;
        }
    })();

    // BIDI HELPERS

    function iterateBidiSections(order, from, to, f) {
        if (!order) {
            return f(from, to, "ltr");
        }
        var found = false;
        for (var i = 0; i < order.length; i += 1) {
            var part = order[i];
            if (part.from < to && part.to > from || from == to && part.to == from) {
                f(Math.max(part.from, from), Math.min(part.to, to), part.level == 1
                    ? "rtl"
                    : "ltr");
                found = true;
            }
        }
        if (!found) {
            f(from, to, "ltr");
        }
    }

    function bidiLeft(part) {
        return part.level % 2
            ? part.to
            : part.from;
    }
    function bidiRight(part) {
        return part.level % 2
            ? part.from
            : part.to;
    }

    function lineLeft(line) {
        var order = getOrder(line);
        return order
            ? bidiLeft(order[0])
            : 0;
    }
    function lineRight(line) {
        var order = getOrder(line);
        if (!order) {
            return line.text.length;
        }
        return bidiRight(lst(order));
    }

    function lineStart(cm, lineN) {
        var line = getLine(cm.doc, lineN);
        var visual = visualLine(line);
        if (visual != line) {
            lineN = lineNo(visual);
        }
        var order = getOrder(visual);
        var ch = !order
            ? 0
            : order[0].level % 2
                ? lineRight(visual)
                : lineLeft(visual);
        return Pos(lineN, ch);
    }
    function lineEnd(cm, lineN) {
        var merged,
            line = getLine(cm.doc, lineN);
        while (merged = collapsedSpanAtEnd(line)) {
            line  = merged
                .find(1, true)
                .line;
            lineN = null;
        }
        var order = getOrder(line);
        var ch = !order
            ? line.text.length
            : order[0].level % 2
                ? lineLeft(line)
                : lineRight(line);
        return Pos(lineN == null
            ? lineNo(line)
            : lineN,
        ch);
    }
    function lineStartSmart(cm, pos) {
        var start = lineStart(cm, pos.line);
        var line = getLine(cm.doc, start.line);
        var order = getOrder(line);
        if (!order || order[0].level == 0) {
            var firstNonWS = Math.max(0, line.text.search(/\S/));
            var inWS = pos.line == start.line && pos.ch <= firstNonWS && pos.ch;
            return Pos(start.line, inWS
                ? 0
                : firstNonWS);
        }
        return start;
    }

    function compareBidiLevel(order, a, b) {
        var linedir = order[0].level;
        if (a == linedir) {
            return true;
        }
        if (b == linedir) {
            return false;
        }
        return a < b;
    }
    var bidiOther;
    function getBidiPartAt(order, pos) {
        bidiOther = null;
        for (var i = 0, found; i < order.length; i += 1) {
            var cur = order[i];
            if (cur.from < pos && cur.to > pos) {
                return i;
            }
            if ((cur.from == pos || cur.to == pos)) {
                if (found == null) {
                    found = i;
                } else if (compareBidiLevel(order, cur.level, order[found].level)) {
                    if (cur.from != cur.to) {
                        bidiOther = found;
                    }
                    return i;
                } else {
                    if (cur.from != cur.to) {
                        bidiOther = i;
                    }
                    return found;
                }
            }
        }
        return found;
    }

    function moveInLine(line, pos, dir, byUnit) {
        if (!byUnit) {
            return pos + dir;
        }
        do {
            pos += dir;
        } while (pos > 0 && isExtendingChar(line.text.charAt(pos)));
        return pos;
    }

    // This is needed in order to move 'visually' through bi-directional text --
    // i.e., pressing left should make the cursor go left, even when in RTL text.
    // The tricky part is the 'jumps', where RTL and LTR text touch each other. This
    // often requires the cursor offset to move more than one unit, in order to
    // visually move one unit.
    function moveVisually(line, start, dir, byUnit) {
        var bidi = getOrder(line);
        if (!bidi) {
            return moveLogically(line, start, dir, byUnit);
        }
        var pos  = getBidiPartAt(bidi, start),
            part = bidi[pos];
        var target = moveInLine(line, start, part.level % 2
            ? -dir
            : dir,
        byUnit);

        for (;;) {
            if (target > part.from && target < part.to) {
                return target;
            }
            if (target == part.from || target == part.to) {
                if (getBidiPartAt(bidi, target) == pos) {
                    return target;
                }
                part = bidi[pos += dir];
                return (dir > 0) == part.level % 2
                    ? part.to
                    : part.from;
            } else {
                part = bidi[pos += dir];
                if (!part) {
                    return null;
                }
                if ((dir > 0) == part.level % 2) {
                    target = moveInLine(line, part.to, -1, byUnit);
                } else {
                    target = moveInLine(line, part.from, 1, byUnit);
                }
            }
        }
    }

    function moveLogically(line, start, dir, byUnit) {
        var target = start + dir;
        if (byUnit) {
            while (target > 0 && isExtendingChar(line.text.charAt(target))) {
                target += dir;
            }
        }
        return target < 0 || target > line.text.length
            ? null
            : target;
    }

    // Bidirectional ordering algorithm See
    // http://unicode.org/reports/tr9/tr9-13.html for the algorithm that this
    // (partially) implements. One-char codes used for character types:
    // - L (L):   Left-to-Right
    // - R (R):   Right-to-Left
    // - r (AL):  Right-to-Left Arabic
    // - 1 (EN):  European Number
    // - + (ES):  European Number Separator
    // - % (ET):  European Number Terminator
    // - n (AN):  Arabic Number
    // - , (CS):  Common Number Separator
    // - m (NSM): Non-Spacing Mark
    // - b (BN):  Boundary Neutral
    // - s (B):   Paragraph Separator
    // - t (S):   Segment Separator
    // - w (WS):  Whitespace
    // - N (ON):  Other Neutrals
    //
    // Returns null if characters are ordered as they appear (left-to-right), or an
    // array of sections ({from, to, level} objects) in the order in which they
    // occur visually.
    var bidiOrdering = (function () {
        // Character types for codepoints 0 to 0xff
        var lowTypes = "bbbbbbbbbtstwsbbbbbbbbbbbbbbssstwNN%%%NNNNNN,N,N1111111111NNNNNNNLLLLLLLLLLLLL" +
                "LLLLLLLLLLLLLNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNbbbbbbsbbbbbbbbbbbbbbbbbbbbbb" +
                "bbbb,N%%%%NNNNLNNNNN%%11NLNNN1LNNNNNLLLLLLLLLLLLLLLLLLLLLLLNLLLLLLLLLLLLLLLLLL" +
                "LLLLLLLLLLLLLN";
        // Character types for codepoints 0x600 to 0x6ff
        var arabicTypes = "rrrrrrrrrrrr,rNNmmmmmmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmm" +
                "mmmmmmmmmmmrrrrrrrnnnnnnnnnn%nnrrrmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr" +
                "rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmmmmmmN" +
                "mmmm";
        function charType(code) {
            if (code <= 0xf7) {
                return lowTypes.charAt(code);
            } else if (0x590 <= code && code <= 0x5f4) {
                return "R";
            } else if (0x600 <= code && code <= 0x6ed) {
                return arabicTypes.charAt(code - 0x600);
            } else if (0x6ee <= code && code <= 0x8ac) {
                return "r";
            } else if (0x2000 <= code && code <= 0x200b) {
                return "w";
            } else if (code == 0x200c) {
                return "b";
            } else {
                return "L";
            }
        }

        var bidiRE = /[\u0590-\u05f4\u0600-\u06ff\u0700-\u08ac]/;
        var isNeutral    = /[stwN]/,
            isStrong     = /[LRr]/,
            countsAsLeft = /[Lb1n]/,
            countsAsNum  = /[1n]/;
        // Browsers seem to always treat the boundaries of block elements as being L.
        var outerType = "L";

        function BidiSpan(level, from, to) {
            this.level = level;
            this.from  = from;
            this.to    = to;
        }

        return function (str) {
            if (!bidiRE.test(str)) {
                return false;
            }
            var len   = str.length,
                types = [];
            for (var i = 0, type; i < len; i += 1) {
                types.push(type = charType(str.charCodeAt(i)));
            }

            // W1. Examine each non-spacing mark (NSM) in the level run, and change the type
            // of the NSM to the type of the previous character. If the NSM is at the start
            // of the level run, it will get the type of sor.
            for (var i = 0, prev = outerType; i < len; i += 1) {
                var type = types[i];
                if (type == "m") {
                    types[i] = prev;
                } else {
                    prev = type;
                }
            }

            // W2. Search backwards from each instance of a European number until the first
            // strong type (R, L, AL, or sor) is found. If an AL is found, change the type
            // of the European number to Arabic number. W3. Change all ALs to R.
            for (var i = 0, cur = outerType; i < len; i += 1) {
                var type = types[i];
                if (type == "1" && cur == "r") {
                    types[i] = "n";
                } else if (isStrong.test(type)) {
                    cur = type;
                    if (type == "r") {
                        types[i] = "R";
                    }
                }
            }

            // W4. A single European separator between two European numbers changes to a
            // European number. A single common separator between two numbers of the same
            // type changes to that type.
            for (var i = 1, prev = types[0]; i < len - 1; i += 1) {
                var type = types[i];
                if (type == "+" && prev == "1" && types[i + 1] == "1") {
                    types[i] = "1";
                } else if (type == "," && prev == types[i + 1] && (prev == "1" || prev == "n")) {
                    types[i] = prev;
                }
                prev = type;
            }

            // W5. A sequence of European terminators adjacent to European numbers changes
            // to all European numbers. W6. Otherwise, separators and terminators change to
            // Other Neutral.
            for (var i = 0; i < len; i += 1) {
                var type = types[i];
                if (type == ",") {
                    types[i] = "N";
                } else if (type == "%") {
                    for (var end = i + 1; end < len && types[end] == "%"; end += 1) {}
                    var replace = (i && types[i - 1] == "!") || (end < len && types[end] == "1")
                        ? "1"
                        : "N";
                    for (var j = i; j < end; j += 1) {
                        types[j] = replace;
                    }
                    i = end - 1;
                }
            }

            // W7. Search backwards from each instance of a European number until the first
            // strong type (R, L, or sor) is found. If an L is found, then change the type
            // of the European number to L.
            for (var i = 0, cur = outerType; i < len; i += 1) {
                var type = types[i];
                if (cur == "L" && type == "1") {
                    types[i] = "L";
                } else if (isStrong.test(type)) {
                    cur = type;
                }
            }

            // N1. A sequence of neutrals takes the direction of the surrounding strong text
            // if the text on both sides has the same direction. European and Arabic numbers
            // act as if they were R in terms of their influence on neutrals.
            // Start-of-level-run (sor) and end-of-level-run (eor) are used at level run
            // boundaries. N2. Any remaining neutrals take the embedding direction.
            for (var i = 0; i < len; i += 1) {
                if (isNeutral.test(types[i])) {
                    for (var end = i + 1; end < len && isNeutral.test(types[end]); end += 1) {}
                    var before = (i
                        ? types[i - 1]
                        : outerType) == "L";
                    var after = (end < len
                        ? types[end]
                        : outerType) == "L";
                    var replace = before || after
                        ? "L"
                        : "R";
                    for (var j = i; j < end; j += 1) {
                        types[j] = replace;
                    }
                    i = end - 1;
                }
            }

            // Here we depart from the documented algorithm, in order to avoid building up
            // an actual levels array. Since there are only three levels (0, 1, 2) in an
            // implementation that doesn't take explicit embedding into account, we can
            // build up the order on the fly, without following the level-based algorithm.
            var order = [],
                m;
            for (var i = 0; i < len;) {
                if (countsAsLeft.test(types[i])) {
                    var start = i;
                    for (i += 1; i < len && countsAsLeft.test(types[i]); i += 1) {}
                    order.push(new BidiSpan(0, start, i));
                } else {
                    var pos = i,
                        at  = order.length;
                    for (i += 1; i < len && types[i] != "L"; i += 1) {}
                    for (var j = pos; j < i;) {
                        if (countsAsNum.test(types[j])) {
                            if (pos < j) {
                                order.splice(at, 0, new BidiSpan(1, pos, j));
                            }
                            var nstart = j;
                            for (j += 1; j < i && countsAsNum.test(types[j]); j += 1) {}
                            order.splice(at, 0, new BidiSpan(2, nstart, j));
                            pos = j;
                        } else {
                            ++j;
                        }
                    }
                    if (pos < i) {
                        order.splice(at, 0, new BidiSpan(1, pos, i));
                    }
                }
            }
            if (order[0].level == 1 && (m = str.match(/^\s+/))) {
                order[0].from = m[0].length;
                order.unshift(new BidiSpan(0, 0, m[0].length));
            }
            if (lst(order).level == 1 && (m = str.match(/\s+$/))) {
                lst(order).to -= m[0].length;
                order.push(new BidiSpan(0, len - m[0].length, len));
            }
            if (order[0].level != lst(order).level) {
                order.push(new BidiSpan(order[0].level, len, len));
            }

            return order;
        };
    })();

    // THE END

    codeMirror.version = "4.12.0";

    return codeMirror;
});


//foldgutter.js
(function (mod) {
    if (typeof exports == "object" && typeof module == "object") { // CommonJS
        mod(require("../../lib/codemirror"), require("./foldcode"));
    } else if (typeof define == "function" && define.amd) { // AMD
        define([
            "../../lib/codemirror", "./foldcode"
        ], mod);
    } else { // Plain browser env
        mod(codeMirror);
    }
})(function (codeMirror) {
    "use strict";

    codeMirror.defineOption("foldGutter", false, function (cm, val, old) {
        if (old && old != codeMirror.Init) {
            cm.clearGutter(cm.state.foldGutter.options.gutter);
            cm.state.foldGutter = null;
            cm.off("gutterClick", onGutterClick);
            cm.off("change", onChange);
            cm.off("viewportChange", onViewportChange);
            cm.off("fold", onFold);
            cm.off("unfold", onFold);
            cm.off("swapDoc", updateInViewport);
        }
        if (val) {
            cm.state.foldGutter = new State(parseOptions(val));
            updateInViewport(cm);
            cm.on("gutterClick", onGutterClick);
            cm.on("change", onChange);
            cm.on("viewportChange", onViewportChange);
            cm.on("fold", onFold);
            cm.on("unfold", onFold);
            cm.on("swapDoc", updateInViewport);
        }
    });

    var Pos = codeMirror.Pos;

    function State(options) {
        this.options = options;
        this.from    = this.to = 0;
    }

    function parseOptions(opts) {
        if (opts === true) {
            opts = {};
        }
        if (opts.gutter == null) {
            opts.gutter = "CodeMirror-foldgutter";
        }
        if (opts.indicatorOpen == null) {
            opts.indicatorOpen = "CodeMirror-foldgutter-open";
        }
        if (opts.indicatorFolded == null) {
            opts.indicatorFolded = "CodeMirror-foldgutter-folded";
        }
        return opts;
    }

    function isFolded(cm, line) {
        var marks = cm.findMarksAt(Pos(line));
        for (var i = 0; i < marks.length; i += 1) {
            if (marks[i].__isFold && marks[i].find().from.line == line) {
                return true;
            }
        }
    }

    function marker(spec) {
        if (typeof spec == "string") {
            var elt = document.createElement("div");
            elt.className = spec + " CodeMirror-guttermarker-subtle";
            return elt;
        } else {
            return spec.cloneNode(true);
        }
    }

    function updateFoldInfo(cm, from, to) {
        var opts = cm.state.foldGutter.options,
            cur  = from;
        var minSize = cm.foldOption(opts, "minFoldSize");
        var func = cm.foldOption(opts, "rangeFinder");
        cm.eachLine(from, to, function (line) {
            var mark = null;
            if (isFolded(cm, cur)) {
                mark = marker(opts.indicatorFolded);
            } else {
                var pos = Pos(cur, 0);
                var range = func && func(cm, pos);
                if (range && range.to.line - range.from.line >= minSize) {
                    mark = marker(opts.indicatorOpen);
                }
            }
            cm.setGutterMarker(line, opts.gutter, mark);
            cur += 1;
        });
    }

    function updateInViewport(cm) {
        var vp    = cm.getViewport(),
            state = cm.state.foldGutter;
        if (!state) {
            return;
        }
        cm.operation(function () {
            updateFoldInfo(cm, vp.from, vp.to);
        });
        state.from = vp.from;
        state.to   = vp.to;
    }

    function onGutterClick(cm, line, gutter) {
        var opts = cm.state.foldGutter.options;
        if (gutter != opts.gutter) {
            return;
        }
        cm.foldCode(Pos(line, 0), opts.rangeFinder);
    }

    function onChange(cm) {
        var state = cm.state.foldGutter,
            opts  = cm.state.foldGutter.options;
        state.from = state.to = 0;
        clearTimeout(state.changeUpdate);
        state.changeUpdate = setTimeout(function () {
            updateInViewport(cm);
        }, opts.foldOnChangeTimeSpan || 600);
    }

    function onViewportChange(cm) {
        var state = cm.state.foldGutter,
            opts  = cm.state.foldGutter.options;
        clearTimeout(state.changeUpdate);
        state.changeUpdate = setTimeout(function () {
            var vp = cm.getViewport();
            if (state.from == state.to || vp.from - state.to > 20 || state.from - vp.to > 20) {
                updateInViewport(cm);
            } else {
                cm.operation(function () {
                    if (vp.from < state.from) {
                        updateFoldInfo(cm, vp.from, state.from);
                        state.from = vp.from;
                    }
                    if (vp.to > state.to) {
                        updateFoldInfo(cm, state.to, vp.to);
                        state.to = vp.to;
                    }
                });
            }
        }, opts.updateViewportTimeSpan || 400);
    }

    function onFold(cm, from) {
        var state = cm.state.foldGutter,
            line  = from.line;
        if (line >= state.from && line < state.to) {
            updateFoldInfo(cm, line, line + 1);
        }
    }
});
//brace-fold.js
(function (mod) {
    if (typeof exports == "object" && typeof module == "object") { // CommonJS
        mod(require("../../lib/codemirror"));
    } else if (typeof define == "function" && define.amd) { // AMD
        define(["../../lib/codemirror"], mod);
    } else { // Plain browser env
        mod(codeMirror);
    }
})(function (codeMirror) {
    "use strict";

    codeMirror.registerHelper("fold", "brace", function (cm, start) {
        var line     = start.line,
            lineText = cm.getLine(line);
        var startCh,
            tokenType;

        function findOpening(openCh) {
            for (var at = start.ch, pass = 0;;) {
                var found = at <= 0
                    ? -1
                    : lineText.lastIndexOf(openCh, at - 1);
                if (found == -1) {
                    if (pass == 1) {
                        break;
                    }
                    pass = 1;
                    at   = lineText.length;
                    continue;
                }
                if (pass == 1 && found < start.ch) {
                    break;
                }
                tokenType = cm.getTokenTypeAt(codeMirror.Pos(line, found + 1));
                if (!/^(comment|string)/.test(tokenType)) {
                    return found + 1;
                }
                at = found - 1;
            }
        }

        var startToken = "{",
            endToken   = "}",
            startCh    = findOpening("{");
        if (startCh == null) {
            startToken = "[",
            endToken   = "]";
            startCh    = findOpening("[");
        }

        if (startCh == null) {
            return;
        }
        var count    = 1,
            lastLine = cm.lastLine(),
            end,
            endCh;
        outer : for (var i = line; i <= lastLine; i += 1) {
            var text = cm.getLine(i),
                pos  = i == line
                    ? startCh
                    : 0;
            for (;;) {
                var nextOpen  = text.indexOf(startToken, pos),
                    nextClose = text.indexOf(endToken, pos);
                if (nextOpen < 0) {
                    nextOpen = text.length;
                }
                if (nextClose < 0) {
                    nextClose = text.length;
                }
                pos = Math.min(nextOpen, nextClose);
                if (pos == text.length) {
                    break;
                }
                if (cm.getTokenTypeAt(codeMirror.Pos(i, pos + 1)) == tokenType) {
                    if (pos == nextOpen) {
                        ++count;
                    } else if (!--count) {
                        end   = i;
                        endCh = pos;
                        break outer;
                    }
                }
                pos += 1;
            }
        };
        if (end == null || line == end && endCh == startCh) {
            return;
        }
        return {
            from: codeMirror.Pos(line, startCh),
            to  : codeMirror.Pos(end, endCh)
        };
    });

    codeMirror.registerHelper("fold", "import", function (cm, start) {
        function hasImport(line) {
            if (line < cm.firstLine() || line > cm.lastLine()) {
                return null;
            }
            var start = cm.getTokenAt(codeMirror.Pos(line, 1));
            if (!/\S/.test(start.string)) {
                start = cm.getTokenAt(codeMirror.Pos(line, start.end + 1));
            }
            if (start.type != "keyword" || start.string != "import") {
                return null;
            }
            // Now find closing semicolon, return its position
            for (var i = line, e = Math.min(cm.lastLine(), line + 10); i <= e; i += 1) {
                var text = cm.getLine(i),
                    semi = text.indexOf(";");
                if (semi != -1) {
                    return {
                        end    : codeMirror.Pos(i, semi),
                        startCh: start.end
                    };
                }
            }
        }

        var start = start.line,
            has   = hasImport(start),
            prev;
        if (!has || hasImport(start - 1) || ((prev = hasImport(start - 2)) && prev.end.line == start - 1)) {
            return null;
        }
        for (var end = has.end;;) {
            var next = hasImport(end.line + 1);
            if (next == null) {
                break;
            }
            end = next.end;
        }
        return {
            from: cm.clipPos(codeMirror.Pos(start, has.startCh + 1)),
            to  : end
        };
    });

    codeMirror.registerHelper("fold", "include", function (cm, start) {
        function hasInclude(line) {
            if (line < cm.firstLine() || line > cm.lastLine()) {
                return null;
            }
            var start = cm.getTokenAt(codeMirror.Pos(line, 1));
            if (!/\S/.test(start.string)) {
                start = cm.getTokenAt(codeMirror.Pos(line, start.end + 1));
            }
            if (start.type == "meta" && start.string.slice(0, 8) == "#include") {
                return start.start + 8;
            }
        }

        var start = start.line,
            has   = hasInclude(start);
        if (has == null || hasInclude(start - 1) != null) {
            return null;
        }
        for (var end = start;;) {
            var next = hasInclude(end + 1);
            if (next == null) {
                break;
            }
            ++end;
        }
        return {
            from: codeMirror.Pos(start, has + 1),
            to  : cm.clipPos(codeMirror.Pos(end))
        };
    });

});
//comment-fold.js
(function (mod) {
    if (typeof exports == "object" && typeof module == "object") { // CommonJS
        mod(require("../../lib/codemirror"));
    } else if (typeof define == "function" && define.amd) { // AMD
        define(["../../lib/codemirror"], mod);
    } else { // Plain browser env
        mod(codeMirror);
    }
})(function (codeMirror) {
    "use strict";

    codeMirror.registerGlobalHelper("fold", "comment", function (mode) {
        return mode.blockCommentStart && mode.blockCommentEnd;
    }, function (cm, start) {
        var mode       = cm.getModeAt(start),
            startToken = mode.blockCommentStart,
            endToken   = mode.blockCommentEnd;
        if (!startToken || !endToken) {
            return;
        }
        var line     = start.line,
            lineText = cm.getLine(line);

        var startCh;
        for (var at = start.ch, pass = 0;;) {
            var found = at <= 0
                ? -1
                : lineText.lastIndexOf(startToken, at - 1);
            if (found == -1) {
                if (pass == 1) {
                    return;
                }
                pass = 1;
                at   = lineText.length;
                continue;
            }
            if (pass == 1 && found < start.ch) {
                return;
            }
            if (/comment/.test(cm.getTokenTypeAt(codeMirror.Pos(line, found + 1)))) {
                startCh = found + startToken.length;
                break;
            }
            at = found - 1;
        }

        var depth    = 1,
            lastLine = cm.lastLine(),
            end,
            endCh;
        outer : for (var i = line; i <= lastLine; i += 1) {
            var text = cm.getLine(i),
                pos  = i == line
                    ? startCh
                    : 0;
            for (;;) {
                var nextOpen  = text.indexOf(startToken, pos),
                    nextClose = text.indexOf(endToken, pos);
                if (nextOpen < 0) {
                    nextOpen = text.length;
                }
                if (nextClose < 0) {
                    nextClose = text.length;
                }
                pos = Math.min(nextOpen, nextClose);
                if (pos == text.length) {
                    break;
                }
                if (pos == nextOpen) {
                    ++depth;
                } else if (!--depth) {
                    end   = i;
                    endCh = pos;
                    break outer;
                }
                pos += 1;
            }
        };
        if (end == null || line == end && endCh == startCh) {
            return;
        }
        return {
            from: codeMirror.Pos(line, startCh),
            to  : codeMirror.Pos(end, endCh)
        };
    });

});
//indent-fold.js
(function (mod) {
    if (typeof exports == "object" && typeof module == "object") { // CommonJS
        mod(require("../../lib/codemirror"));
    } else if (typeof define == "function" && define.amd) { // AMD
        define(["../../lib/codemirror"], mod);
    } else { // Plain browser env
        mod(codeMirror);
    }
})(function (codeMirror) {
    "use strict";

    codeMirror.registerHelper("fold", "indent", function (cm, start) {
        var tabSize   = cm.getOption("tabSize"),
            firstLine = cm.getLine(start.line);
        if (!/\S/.test(firstLine)) {
            return;
        }
        var getIndent = function (line) {
            return codeMirror.countColumn(line, null, tabSize);
        };
        var myIndent = getIndent(firstLine);
        var lastLineInFold = null;
        // Go through lines until we find a line that definitely doesn't belong in the
        // block we're folding, or to the end.
        for (var i = start.line + 1, end = cm.lastLine(); i <= end; i += 1) {
            var curLine = cm.getLine(i);
            var curIndent = getIndent(curLine);
            if (curIndent > myIndent) {
                // Lines with a greater indent are considered part of the block.
                lastLineInFold = i;
            } else if (!/\S/.test(curLine)) {
                // Empty lines might be breaks within the block we're trying to fold.
            } else {
                // A non-empty line at an indent equal to or less than ours marks the start of
                // another block.
                break;
            }
        }
        if (lastLineInFold) {
            return {
                from: codeMirror.Pos(start.line, firstLine.length),
                to  : codeMirror.Pos(lastLineInFold, cm.getLine(lastLineInFold).length)
            };
        }
    });

});
//xml-fold.js
(function (mod) {
    if (typeof exports == "object" && typeof module == "object") { // CommonJS
        mod(require("../../lib/codemirror"));
    } else if (typeof define == "function" && define.amd) { // AMD
        define(["../../lib/codemirror"], mod);
    } else { // Plain browser env
        mod(codeMirror);
    }
})(function (codeMirror) {
    "use strict";

    var Pos = codeMirror.Pos;
    function cmp(a, b) {
        return a.line - b.line || a.ch - b.ch;
    }

    var nameStartChar = "A-Z_a-z\\u00C0-\\u00D6\\u00D8-\\u00F6\\u00F8-\\u02FF\\u0370-\\u037D\\u037F-\\u" +
            "1FFF\\u200C-\\u200D\\u2070-\\u218F\\u2C00-\\u2FEF\\u3001-\\uD7FF\\uF900-\\uFDC" +
            "F\\uFDF0-\\uFFFD";
    var nameChar = nameStartChar + "\-\:\.0-9\\u00B7\\u0300-\\u036F\\u203F-\\u2040";
    var xmlTagStart = new RegExp("<(/?)([" + nameStartChar + "][" + nameChar + "]*)", "g");

    function Iter(cm, line, ch, range) {
        this.line = line;
        this.ch   = ch;
        this.cm   = cm;
        this.text = cm.getLine(line);
        this.min  = range
            ? range.from
            : cm.firstLine();
        this.max  = range
            ? range.to - 1
            : cm.lastLine();
    }

    function tagAt(iter, ch) {
        var type = iter
            .cm
            .getTokenTypeAt(Pos(iter.line, ch));
        return type && /\btag\b/.test(type);
    }

    function nextLine(iter) {
        if (iter.line >= iter.max) {
            return;
        }
        iter.ch   = 0;
        iter.text = iter
            .cm
            .getLine(++iter.line);
        return true;
    }
    function prevLine(iter) {
        if (iter.line <= iter.min) {
            return;
        }
        iter.text = iter
            .cm
            .getLine(--iter.line);
        iter.ch   = iter.text.length;
        return true;
    }

    function toTagEnd(iter) {
        for (;;) {
            var gt = (typeof iter.text === "string")
                ? iter
                    .text
                    .indexOf(">", iter.ch)
                : 0;
            if (gt == -1) {
                if (nextLine(iter)) {
                    continue;
                } else {
                    return;
                }
            }
            if (!tagAt(iter, gt + 1)) {
                iter.ch = gt + 1;
                continue;
            }
            var lastSlash = iter
                .text
                .lastIndexOf("/", gt);
            var selfClose = lastSlash > -1 && !/\S/.test(iter.text.slice(lastSlash + 1, gt));
            iter.ch = gt + 1;
            return selfClose
                ? "selfClose"
                : "regular";
        }
    }
    function toTagStart(iter) {
        for (;;) {
            var lt = iter.ch
                ? iter
                    .text
                    .lastIndexOf("<", iter.ch - 1)
                : -1;
            if (lt == -1) {
                if (prevLine(iter)) {
                    continue;
                } else {
                    return;
                }
            }
            if (!tagAt(iter, lt + 1)) {
                iter.ch = lt;
                continue;
            }
            xmlTagStart.lastIndex = lt;
            iter.ch               = lt;
            var match = xmlTagStart.exec(iter.text);
            if (match && match.index == lt) {
                return match;
            }
        }
    }

    function toNextTag(iter) {
        for (;;) {
            xmlTagStart.lastIndex = iter.ch;
            var found = xmlTagStart.exec(iter.text);
            if (!found) {
                if (nextLine(iter)) {
                    continue;
                } else {
                    return;
                }
            }
            if (!tagAt(iter, found.index + 1)) {
                iter.ch = found.index + 1;
                continue;
            }
            iter.ch = found.index + found[0].length;
            return found;
        }
    }
    function toPrevTag(iter) {
        for (;;) {
            var gt = iter.ch
                ? iter
                    .text
                    .lastIndexOf(">", iter.ch - 1)
                : -1;
            if (gt == -1) {
                if (prevLine(iter)) {
                    continue;
                } else {
                    return;
                }
            }
            if (!tagAt(iter, gt + 1)) {
                iter.ch = gt;
                continue;
            }
            var lastSlash = iter
                .text
                .lastIndexOf("/", gt);
            var selfClose = lastSlash > -1 && !/\S/.test(iter.text.slice(lastSlash + 1, gt));
            iter.ch = gt + 1;
            return selfClose
                ? "selfClose"
                : "regular";
        }
    }

    function findMatchingClose(iter, tag) {
        var stack = [];
        for (;;) {
            var next      = toNextTag(iter),
                end,
                startLine = iter.line,
                startCh   = iter.ch - (next
                    ? next[0].length
                    : 0);
            if (!next || !(end = toTagEnd(iter))) {
                return;
            }
            if (end == "selfClose") {
                continue;
            }
            if (next[1]) { // closing tag
                for (var i = stack.length - 1; i >= 0; i -= 1) {
                    if (stack[i] == next[2]) {
                        stack.length = i;
                        break;
                    }
                }
                if (i < 0 && (!tag || tag == next[2])) {
                    return {
                        from: Pos(startLine, startCh),
                        tag : next[2],
                        to  : Pos(iter.line, iter.ch)
                    };
                }
            } else { // opening tag
                stack.push(next[2]);
            }
        }
    }
    function findMatchingOpen(iter, tag) {
        var stack = [];
        for (;;) {
            var prev = toPrevTag(iter);
            if (!prev) {
                return;
            }
            if (prev == "selfClose") {
                toTagStart(iter);
                continue;
            }
            var endLine = iter.line,
                endCh   = iter.ch;
            var start = toTagStart(iter);
            if (!start) {
                return;
            }
            if (start[1]) { // closing tag
                stack.push(start[2]);
            } else { // opening tag
                for (var i = stack.length - 1; i >= 0; i -= 1) {
                    if (stack[i] == start[2]) {
                        stack.length = i;
                        break;
                    }
                }
                if (i < 0 && (!tag || tag == start[2])) {
                    return {
                        from: Pos(iter.line, iter.ch),
                        tag : start[2],
                        to  : Pos(endLine, endCh)
                    };
                }
            }
        }
    }

    codeMirror.registerHelper("fold", "xml", function (cm, start) {
        var iter = new Iter(cm, start.line, 0);
        for (;;) {
            var openTag = toNextTag(iter),
                end;
            if (!openTag || iter.line != start.line || !(end = toTagEnd(iter))) {
                return;
            }
            if (!openTag[1] && end != "selfClose") {
                var start = Pos(iter.line, iter.ch);
                var close = findMatchingClose(iter, openTag[2]);
                return close && {
                    from: start,
                    to  : close.from
                };
            }
        }
    });
    codeMirror.findMatchingTag   = function (cm, pos, range) {
        var iter = new Iter(cm, pos.line, pos.ch, range);
        if (iter.text.indexOf(">") == -1 && iter.text.indexOf("<") == -1) {
            return;
        }
        var end = toTagEnd(iter),
            to  = end && Pos(iter.line, iter.ch);
        var start = end && toTagStart(iter);
        if (!end || !start || cmp(iter, pos) > 0) {
            return;
        }
        var here = {
            from: Pos(iter.line, iter.ch),
            tag : start[2],
            to  : to
        };
        if (end == "selfClose") {
            return {at: "open", close: null, open: here};
        }

        if (start[1]) { // closing tag
            return {
                at   : "close",
                close: here,
                open : findMatchingOpen(iter, start[2])
            };
        } else { // opening tag
            iter = new Iter(cm, to.line, to.ch, range);
            return {
                at   : "open",
                close: findMatchingClose(iter, start[2]),
                open : here
            };
        }
    };

    codeMirror.findEnclosingTag  = function (cm, pos, range) {
        var iter = new Iter(cm, pos.line, pos.ch, range);
        for (;;) {
            var open = findMatchingOpen(iter);
            if (!open) {
                break;
            }
            var forward = new Iter(cm, pos.line, pos.ch, range);
            var close = findMatchingClose(forward, open.tag);
            if (close) {
                return {close: close, open: open};
            }
        }
    };

    // Used by addon/edit/closetag.js
    codeMirror.scanForClosingTag = function (cm, pos, name, end) {
        var iter = new Iter(cm, pos.line, pos.ch, end
            ? {
                from: 0,
                to  : end
            }
            : null);
        return findMatchingClose(iter, name);
    };
});
//foldcode.js
(function (mod) {
    if (typeof exports == "object" && typeof module == "object") { // CommonJS
        mod(require("../../lib/codemirror"));
    } else if (typeof define == "function" && define.amd) { // AMD
        define(["../../lib/codemirror"], mod);
    } else { // Plain browser env
        mod(codeMirror);
    }
})(function (codeMirror) {
    "use strict";

    function doFold(cm, pos, options, force) {
        if (options && options.call) {
            var finder = options;
            options = null;
        } else {
            var finder = getOption(cm, options, "rangeFinder");
        }
        if (typeof pos == "number") {
            pos = codeMirror.Pos(pos, 0);
        }
        var minSize = getOption(cm, options, "minFoldSize");

        function getRange(allowFolded) {
            var range = finder(cm, pos);
            if (!range || range.to.line - range.from.line < minSize) {
                return null;
            }
            var marks = cm.findMarksAt(range.from);
            for (var i = 0; i < marks.length; i += 1) {
                if (marks[i].__isFold && force !== "fold") {
                    if (!allowFolded) {
                        return null;
                    }
                    range.cleared = true;
                    marks[i].clear();
                }
            }
            return range;
        }

        var range = getRange(true);
        if (getOption(cm, options, "scanUp")) {
            while (!range && pos.line > cm.firstLine()) {
                pos   = codeMirror.Pos(pos.line - 1, 0);
                range = getRange(false);
            }
        }
        if (!range || range.cleared || force === "unfold") {
            return;
        }

        var myWidget = makeWidget(cm, options);
        codeMirror.on(myWidget, "mousedown", function (e) {
            myRange.clear();
            codeMirror.e_preventDefault(e);
        });
        var myRange = cm.markText(range.from, range.to, {
            __isFold    : true,
            clearOnEnter: true,
            replacedWith: myWidget
        });
        myRange.on("clear", function (from, to) {
            codeMirror.signal(cm, "unfold", cm, from, to);
        });
        codeMirror.signal(cm, "fold", cm, range.from, range.to);
    }

    function makeWidget(cm, options) {
        var widget = getOption(cm, options, "widget");
        if (typeof widget == "string") {
            var text = document.createTextNode(widget);
            widget = document.createElement("span");
            widget.appendChild(text);
            widget.className = "CodeMirror-foldmarker";
        }
        return widget;
    }

    // Clumsy backwards-compatible interface
    codeMirror.newFoldFunction = function (rangeFinder, widget) {
        return function (cm, pos) {
            doFold(cm, pos, {
                rangeFinder: rangeFinder,
                widget     : widget
            });
        };
    };

    // New-style interface
    codeMirror.defineExtension("foldCode", function (pos, options, force) {
        doFold(this, pos, options, force);
    });

    codeMirror.defineExtension("isFolded", function (pos) {
        var marks = this.findMarksAt(pos);
        for (var i = 0; i < marks.length; i += 1) {
            if (marks[i].__isFold) {
                return true;
            }
        }
    });

    codeMirror.commands.toggleFold = function (cm) {
        cm.foldCode(cm.getCursor());
    };
    codeMirror.commands.fold       = function (cm) {
        cm.foldCode(cm.getCursor(), null, "fold");
    };
    codeMirror.commands.unfold     = function (cm) {
        cm.foldCode(cm.getCursor(), null, "unfold");
    };
    codeMirror.commands.foldAll    = function (cm) {
        cm.operation(function () {
            for (var i = cm.firstLine(), e = cm.lastLine(); i <= e; i += 1) {
                cm.foldCode(codeMirror.Pos(i, 0), null, "fold");
            }
        });
    };
    codeMirror.commands.unfoldAll  = function (cm) {
        cm.operation(function () {
            for (var i = cm.firstLine(), e = cm.lastLine(); i <= e; i += 1) {
                cm.foldCode(codeMirror.Pos(i, 0), null, "unfold");
            }
        });
    };

    codeMirror.registerHelper("fold", "combine", function () {
        var funcs = Array
            .prototype
            .slice
            .call(arguments, 0);
        return function (cm, start) {
            for (var i = 0; i < funcs.length; i += 1) {
                var found = funcs[i](cm, start);
                if (found) {
                    return found;
                }
            }
        };
    });

    codeMirror.registerHelper("fold", "auto", function (cm, start) {
        var helpers = cm.getHelpers(start, "fold");
        for (var i = 0; i < helpers.length; i += 1) {
            var cur = helpers[i](cm, start);
            if (cur) {
                return cur;
            }
        }
    });

    var defaultOptions = {
        minFoldSize: 0,
        rangeFinder: codeMirror.fold.auto,
        scanUp     : false,
        widget     : "\u2194"
    };

    codeMirror.defineOption("foldOptions", null);

    function getOption(cm, options, name) {
        if (options && options[name] !== undefined) {
            return options[name];
        }
        var editorOptions = cm.options.foldOptions;
        if (editorOptions && editorOptions[name] !== undefined) {
            return editorOptions[name];
        }
        return defaultOptions[name];
    }

    codeMirror.defineExtension("foldOption", function (options, name) {
        return getOption(this, options, name);
    });
});
//matchtags.js
(function (mod) {
    if (typeof exports == "object" && typeof module == "object") { // CommonJS
        mod(require("../../lib/codemirror"), require("../fold/xml-fold"));
    } else if (typeof define == "function" && define.amd) { // AMD
        define([
            "../../lib/codemirror", "../fold/xml-fold"
        ], mod);
    } else { // Plain browser env
        mod(codeMirror);
    }
})(function (codeMirror) {
    "use strict";

    codeMirror.defineOption("matchTags", false, function (cm, val, old) {
        if (old && old != codeMirror.Init) {
            cm.off("cursorActivity", doMatchTags);
            cm.off("viewportChange", maybeUpdateMatch);
            clear(cm);
        }
        if (val) {
            cm.state.matchBothTags = typeof val == "object" && val.bothTags;
            cm.on("cursorActivity", doMatchTags);
            cm.on("viewportChange", maybeUpdateMatch);
            doMatchTags(cm);
        }
    });

    function clear(cm) {
        if (cm.state.tagHit) {
            cm
                .state
                .tagHit
                .clear();
        }
        if (cm.state.tagOther) {
            cm
                .state
                .tagOther
                .clear();
        }
        cm.state.tagHit = cm.state.tagOther = null;
    }

    function doMatchTags(cm) {
        cm.state.failedTagMatch = false;
        cm.operation(function () {
            clear(cm);
            if (cm.somethingSelected()) {
                return;
            }
            var cur   = cm.getCursor(),
                range = cm.getViewport();
            range.from = Math.min(range.from, cur.line);
            range.to   = Math.max(cur.line + 1, range.to);
            var match = codeMirror.findMatchingTag(cm, cur, range);
            if (!match) {
                return;
            }
            if (cm.state.matchBothTags) {
                var hit = match.at == "open"
                    ? match.open
                    : match.close;
                if (hit) {
                    cm.state.tagHit = cm.markText(hit.from, hit.to, {className: "CodeMirror-matchingtag"});
                }
            }
            var other = match.at == "close"
                ? match.open
                : match.close;
            if (other) {
                cm.state.tagOther = cm.markText(other.from, other.to, {className: "CodeMirror-matchingtag"});
            } else {
                cm.state.failedTagMatch = true;
            }
        });
    }

    function maybeUpdateMatch(cm) {
        if (cm.state.failedTagMatch) {
            doMatchTags(cm);
        }
    }

    codeMirror.commands.toMatchingTag = function (cm) {
        var found = codeMirror.findMatchingTag(cm, cm.getCursor());
        if (found) {
            var other = found.at == "close"
                ? found.open
                : found.close;
            if (other) {
                cm.extendSelection(other.to, other.from);
            }
        }
    };
});
//trailingspace.js
(function (mod) {
    if (typeof exports == "object" && typeof module == "object") { // CommonJS
        mod(require("../../lib/codemirror"));
    } else if (typeof define == "function" && define.amd) { // AMD
        define(["../../lib/codemirror"], mod);
    } else { // Plain browser env
        mod(codeMirror);
    }
})(function (codeMirror) {
    codeMirror.defineOption("showTrailingSpace", false, function (cm, val, prev) {
        if (prev == codeMirror.Init) {
            prev = false;
        }
        if (prev && !val) {
            cm.removeOverlay("trailingspace");
        } else if (!prev && val) {
            cm.addOverlay({
                name : "trailingspace",
                token: function (stream) {
                    for (var l = stream.string.length, i = l; i && /\s/.test(stream.string.charAt(i - 1)); i -= 1) {}
                    if (i > stream.pos) {
                        stream.pos = i;
                        return null;
                    }
                    stream.pos = l;
                    return "trailingspace";
                }
            });
        }
    });
});
//css.js
(function (mod) {
    if (typeof exports == "object" && typeof module == "object") { // CommonJS
        mod(require("../../lib/codemirror"));
    } else if (typeof define == "function" && define.amd) { // AMD
        define(["../../lib/codemirror"], mod);
    } else { // Plain browser env
        mod(codeMirror);
    }
})(function (codeMirror) {
    "use strict";

    codeMirror.defineMode("css", function (config, parserConfig) {
        if (!parserConfig.propertyKeywords) {
            parserConfig = codeMirror.resolveMode("text/css");
        }

        var indentUnit                  = config.indentUnit,
            tokenHooks                  = parserConfig.tokenHooks,
            mediaTypes                  = parserConfig.mediaTypes || {},
            mediaFeatures               = parserConfig.mediaFeatures || {},
            propertyKeywords            = parserConfig.propertyKeywords || {},
            nonStandardPropertyKeywords = parserConfig.nonStandardPropertyKeywords || {},
            colorKeywords               = parserConfig.colorKeywords || {},
            valueKeywords               = parserConfig.valueKeywords || {},
            fontProperties              = parserConfig.fontProperties || {},
            allowNested                 = parserConfig.allowNested;

        var type,
            override;
        function ret(style, tp) {
            type = tp;
            return style;
        }

        // Tokenizers

        function tokenBase(stream, state) {
            var ch = stream.next();
            if (tokenHooks[ch]) {
                var result = tokenHooks[ch](stream, state);
                if (result !== false) {
                    return result;
                }
            }
            if (ch == "@") {
                stream.eatWhile(/[\w\\\-]/);
                return ret("def", stream.current());
            } else if (ch == "=" || (ch == "~" || ch == "|") && stream.eat("=")) {
                return ret(null, "compare");
            } else if (ch == "\"" || ch == "'") {
                state.tokenize = tokenString(ch);
                return state.tokenize(stream, state);
            } else if (ch == "#") {
                stream.eatWhile(/[\w\\\-]/);
                return ret("atom", "hash");
            } else if (ch == "!") {
                stream.match(/^\s*\w*/);
                return ret("keyword", "important");
            } else if (/\d/.test(ch) || ch == "." && stream.eat(/\d/)) {
                stream.eatWhile(/[\w.%]/);
                return ret("number", "unit");
            } else if (ch === "-") {
                if (/[\d.]/.test(stream.peek())) {
                    stream.eatWhile(/[\w.%]/);
                    return ret("number", "unit");
                } else if (stream.match(/^-[\w\\\-]+/)) {
                    stream.eatWhile(/[\w\\\-]/);
                    if (stream.match(/^\s*:/, false)) {
                        return ret("variable-2", "variable-definition");
                    }
                    return ret("variable-2", "variable");
                } else if (stream.match(/^\w+-/)) {
                    return ret("meta", "meta");
                }
            } else if (/[,+>*\/]/.test(ch)) {
                return ret(null, "select-op");
            } else if (ch == "." && stream.match(/^-?[_a-z][_a-z0-9-]*/i)) {
                return ret("qualifier", "qualifier");
            } else if (/[:;{}\[\]\(\)]/.test(ch)) {
                return ret(null, ch);
            } else if ((ch == "u" && stream.match(/rl(-prefix)?\(/)) || (ch == "d" && stream.match("omain(")) || (ch == "r" && stream.match("egexp("))) {
                stream.backUp(1);
                state.tokenize = tokenParenthesized;
                return ret("property", "word");
            } else if (/[\w\\\-]/.test(ch)) {
                stream.eatWhile(/[\w\\\-]/);
                return ret("property", "word");
            } else {
                return ret(null, null);
            }
        }

        function tokenString(quote) {
            return function (stream, state) {
                var escaped = false,
                    ch;
                while ((ch = stream.next()) != null) {
                    if (ch == quote && !escaped) {
                        if (quote == ")") {
                            stream.backUp(1);
                        }
                        break;
                    }
                    escaped = !escaped && ch == "\\";
                }
                if (ch == quote || !escaped && quote != ")") {
                    state.tokenize = null;
                }
                return ret("string", "string");
            };
        }

        function tokenParenthesized(stream, state) {
            stream.next(); // Must be '('
            if (!stream.match(/\s*[\"\')]/, false)) {
                state.tokenize = tokenString(")");
            } else {
                state.tokenize = null;
            }
            return ret(null, "(");
        }

        // Context management

        function Context(type, indent, prev) {
            this.type   = type;
            this.indent = indent;
            this.prev   = prev;
        }

        function pushContext(state, stream, type) {
            state.context = new Context(type, stream.indentation() + indentUnit, state.context);
            return type;
        }

        function popContext(state) {
            state.context = state.context.prev;
            return state.context.type;
        }

        function pass(type, stream, state) {
            return states[state.context.type](type, stream, state);
        }
        function popAndPass(type, stream, state, n) {
            for (var i = n || 1; i > 0; i -= 1) {
                state.context = state.context.prev;
            }
            return pass(type, stream, state);
        }

        // Parser

        function wordAsValue(stream) {
            var word = stream
                .current()
                .toLowerCase();
            if (valueKeywords.hasOwnProperty(word)) {
                override = "atom";
            } else if (colorKeywords.hasOwnProperty(word)) {
                override = "keyword";
            } else {
                override = "variable";
            }
        }

        var states = {};

        states.top              = function (type, stream, state) {
            if (type == "{") {
                return pushContext(state, stream, "block");
            } else if (type == "}" && state.context.prev) {
                return popContext(state);
            } else if (/@(media|supports|(-moz-)?document)/.test(type)) {
                return pushContext(state, stream, "atBlock");
            } else if (type == "@font-face") {
                return "font_face_before";
            } else if (/^@(-(moz|ms|o|webkit)-)?keyframes$/.test(type)) {
                return "keyframes";
            } else if (type && type.charAt(0) == "@") {
                return pushContext(state, stream, "at");
            } else if (type == "hash") {
                override = "builtin";
            } else if (type == "word") {
                override = "tag";
            } else if (type == "variable-definition") {
                return "maybeprop";
            } else if (type == "interpolation") {
                return pushContext(state, stream, "interpolation");
            } else if (type == ":") {
                return "pseudo";
            } else if (allowNested && type == "(") {
                return pushContext(state, stream, "parens");
            }
            return state.context.type;
        };

        states.block            = function (type, stream, state) {
            if (type == "word") {
                var word = stream
                    .current()
                    .toLowerCase();
                if (propertyKeywords.hasOwnProperty(word)) {
                    override = "property";
                    return "maybeprop";
                } else if (nonStandardPropertyKeywords.hasOwnProperty(word)) {
                    override = "string-2";
                    return "maybeprop";
                } else if (allowNested) {
                    override = stream.match(/^\s*:(?:\s|$)/, false)
                        ? "property"
                        : "tag";
                    return "block";
                } else {
                    override += " error";
                    return "maybeprop";
                }
            } else if (type == "meta") {
                return "block";
            } else if (!allowNested && (type == "hash" || type == "qualifier")) {
                override = "error";
                return "block";
            } else {
                return states.top(type, stream, state);
            }
        };

        states.maybeprop        = function (type, stream, state) {
            if (type == ":") {
                return pushContext(state, stream, "prop");
            }
            return pass(type, stream, state);
        };

        states.prop             = function (type, stream, state) {
            if (type == ";") {
                return popContext(state);
            }
            if (type == "{" && allowNested) {
                return pushContext(state, stream, "propBlock");
            }
            if (type == "}" || type == "{") {
                return popAndPass(type, stream, state);
            }
            if (type == "(") {
                return pushContext(state, stream, "parens");
            }

            if (type == "hash" && !/^#([0-9a-fA-f]{3}|[0-9a-fA-f]{6})$/.test(stream.current())) {
                override += " error";
            } else if (type == "word") {
                wordAsValue(stream);
            } else if (type == "interpolation") {
                return pushContext(state, stream, "interpolation");
            }
            return "prop";
        };

        states.propBlock        = function (type, _stream, state) {
            if (type == "}") {
                return popContext(state);
            }
            if (type == "word") {
                override = "property";
                return "maybeprop";
            }
            return state.context.type;
        };

        states.parens           = function (type, stream, state) {
            if (type == "{" || type == "}") {
                return popAndPass(type, stream, state);
            }
            if (type == ")") {
                return popContext(state);
            }
            if (type == "(") {
                return pushContext(state, stream, "parens");
            }
            if (type == "word") {
                wordAsValue(stream);
            }
            return "parens";
        };

        states.pseudo           = function (type, stream, state) {
            if (type == "word") {
                override = "variable-3";
                return state.context.type;
            }
            return pass(type, stream, state);
        };

        states.atBlock          = function (type, stream, state) {
            if (type == "(") {
                return pushContext(state, stream, "atBlock_parens");
            }
            if (type == "}") {
                return popAndPass(type, stream, state);
            }
            if (type == "{") {
                return popContext(state) && pushContext(state, stream, allowNested
                    ? "block"
                    : "top");
            }

            if (type == "word") {
                var word = stream
                    .current()
                    .toLowerCase();
                if (word == "only" || word == "not" || word == "and" || word == "or") {
                    override = "keyword";
                } else if (documentTypes.hasOwnProperty(word)) {
                    override = "tag";
                } else if (mediaTypes.hasOwnProperty(word)) {
                    override = "attribute";
                } else if (mediaFeatures.hasOwnProperty(word)) {
                    override = "property";
                } else if (propertyKeywords.hasOwnProperty(word)) {
                    override = "property";
                } else if (nonStandardPropertyKeywords.hasOwnProperty(word)) {
                    override = "string-2";
                } else if (valueKeywords.hasOwnProperty(word)) {
                    override = "atom";
                } else {
                    override = "error";
                }
            }
            return state.context.type;
        };

        states.atBlock_parens   = function (type, stream, state) {
            if (type == ")") {
                return popContext(state);
            }
            if (type == "{" || type == "}") {
                return popAndPass(type, stream, state, 2);
            }
            return states.atBlock(type, stream, state);
        };

        states.font_face_before = function (type, stream, state) {
            if (type == "{") {
                return pushContext(state, stream, "font_face");
            }
            return pass(type, stream, state);
        };

        states.font_face        = function (type, stream, state) {
            if (type == "}") {
                return popContext(state);
            }
            if (type == "word") {
                if (!fontProperties.hasOwnProperty(stream.current().toLowerCase())) {
                    override = "error";
                } else {
                    override = "property";
                }
                return "maybeprop";
            }
            return "font_face";
        };

        states.keyframes        = function (type, stream, state) {
            if (type == "word") {
                override = "variable";
                return "keyframes";
            }
            if (type == "{") {
                return pushContext(state, stream, "top");
            }
            return pass(type, stream, state);
        };

        states.at               = function (type, stream, state) {
            if (type == ";") {
                return popContext(state);
            }
            if (type == "{" || type == "}") {
                return popAndPass(type, stream, state);
            }
            if (type == "word") {
                override = "tag";
            } else if (type == "hash") {
                override = "builtin";
            }
            return "at";
        };

        states.interpolation    = function (type, stream, state) {
            if (type == "}") {
                return popContext(state);
            }
            if (type == "{" || type == ";") {
                return popAndPass(type, stream, state);
            }
            if (type != "variable") {
                override = "error";
            }
            return "interpolation";
        };

        return {
            blockCommentEnd  : "*/",
            blockCommentStart: "/*",

            electricChars    : "}",
            fold             : "brace",

            indent           : function (state, textAfter) {
                var cx = state.context,
                    ch = textAfter && textAfter.charAt(0);
                var indent = cx.indent;
                if (cx.type == "prop" && (ch == "}" || ch == ")")) {
                    cx = cx.prev;
                }
                if (cx.prev && (ch == "}" && (cx.type == "block" || cx.type == "top" || cx.type == "interpolation" || cx.type == "font_face") || ch == ")" && (cx.type == "parens" || cx.type == "media_parens") || ch == "{" && (cx.type == "at" || cx.type == "media"))) {
                    indent = cx.indent - indentUnit;
                    cx     = cx.prev;
                }
                return indent;
            },
            startState       : function (base) {
                return {
                    context : new Context("top", base || 0, null),
                    state   : "top",
                    tokenize: null
                };
            },

            token            : function (stream, state) {
                if (!state.tokenize && stream.eatSpace()) {
                    return null;
                }
                var style = (state.tokenize || tokenBase)(stream, state);
                if (style && typeof style == "object") {
                    type  = style[1];
                    style = style[0];
                }
                override    = style;
                state.state = states[state.state](type, stream, state);
                return override;
            }
        };
    });

    function keySet(array) {
        var keys = {};
        for (var i = 0; i < array.length; i += 1) {
            keys[array[i]] = true;
        }
        return keys;
    }

    var documentTypes_ = [
            "domain", "regexp", "url", "url-prefix"
        ],
        documentTypes  = keySet(documentTypes_);

    var mediaTypes_ = [
            "all",
            "aural",
            "braille",
            "handheld",
            "print",
            "projection",
            "screen",
            "tty",
            "tv",
            "embossed"
        ],
        mediaTypes  = keySet(mediaTypes_);

    var mediaFeatures_ = [
            "width",
            "min-width",
            "max-width",
            "height",
            "min-height",
            "max-height",
            "device-width",
            "min-device-width",
            "max-device-width",
            "device-height",
            "min-device-height",
            "max-device-height",
            "aspect-ratio",
            "min-aspect-ratio",
            "max-aspect-ratio",
            "device-aspect-ratio",
            "min-device-aspect-ratio",
            "max-device-aspect-ratio",
            "color",
            "min-color",
            "max-color",
            "color-index",
            "min-color-index",
            "max-color-index",
            "monochrome",
            "min-monochrome",
            "max-monochrome",
            "resolution",
            "min-resolution",
            "max-resolution",
            "scan",
            "grid"
        ],
        mediaFeatures  = keySet(mediaFeatures_);

    var propertyKeywords_ = [
            "align-content",
            "align-items",
            "align-self",
            "alignment-adjust",
            "alignment-baseline",
            "anchor-point",
            "animation",
            "animation-delay",
            "animation-direction",
            "animation-duration",
            "animation-fill-mode",
            "animation-iteration-count",
            "animation-name",
            "animation-play-state",
            "animation-timing-function",
            "appearance",
            "azimuth",
            "backface-visibility",
            "background",
            "background-attachment",
            "background-clip",
            "background-color",
            "background-image",
            "background-origin",
            "background-position",
            "background-repeat",
            "background-size",
            "baseline-shift",
            "binding",
            "bleed",
            "bookmark-label",
            "bookmark-level",
            "bookmark-state",
            "bookmark-target",
            "border",
            "border-bottom",
            "border-bottom-color",
            "border-bottom-left-radius",
            "border-bottom-right-radius",
            "border-bottom-style",
            "border-bottom-width",
            "border-collapse",
            "border-color",
            "border-image",
            "border-image-outset",
            "border-image-repeat",
            "border-image-slice",
            "border-image-source",
            "border-image-width",
            "border-left",
            "border-left-color",
            "border-left-style",
            "border-left-width",
            "border-radius",
            "border-right",
            "border-right-color",
            "border-right-style",
            "border-right-width",
            "border-spacing",
            "border-style",
            "border-top",
            "border-top-color",
            "border-top-left-radius",
            "border-top-right-radius",
            "border-top-style",
            "border-top-width",
            "border-width",
            "bottom",
            "box-decoration-break",
            "box-shadow",
            "box-sizing",
            "break-after",
            "break-before",
            "break-inside",
            "caption-side",
            "clear",
            "clip",
            "color",
            "color-profile",
            "column-count",
            "column-fill",
            "column-gap",
            "column-rule",
            "column-rule-color",
            "column-rule-style",
            "column-rule-width",
            "column-span",
            "column-width",
            "columns",
            "content",
            "counter-increment",
            "counter-reset",
            "crop",
            "cue",
            "cue-after",
            "cue-before",
            "cursor",
            "direction",
            "display",
            "dominant-baseline",
            "drop-initial-after-adjust",
            "drop-initial-after-align",
            "drop-initial-before-adjust",
            "drop-initial-before-align",
            "drop-initial-size",
            "drop-initial-value",
            "elevation",
            "empty-cells",
            "fit",
            "fit-position",
            "flex",
            "flex-basis",
            "flex-direction",
            "flex-flow",
            "flex-grow",
            "flex-shrink",
            "flex-wrap",
            "float",
            "float-offset",
            "flow-from",
            "flow-into",
            "font",
            "font-feature-settings",
            "font-family",
            "font-kerning",
            "font-language-override",
            "font-size",
            "font-size-adjust",
            "font-stretch",
            "font-style",
            "font-synthesis",
            "font-variant",
            "font-variant-alternates",
            "font-variant-caps",
            "font-variant-east-asian",
            "font-variant-ligatures",
            "font-variant-numeric",
            "font-variant-position",
            "font-weight",
            "grid",
            "grid-area",
            "grid-auto-columns",
            "grid-auto-flow",
            "grid-auto-position",
            "grid-auto-rows",
            "grid-column",
            "grid-column-end",
            "grid-column-start",
            "grid-row",
            "grid-row-end",
            "grid-row-start",
            "grid-template",
            "grid-template-areas",
            "grid-template-columns",
            "grid-template-rows",
            "hanging-punctuation",
            "height",
            "hyphens",
            "icon",
            "image-orientation",
            "image-rendering",
            "image-resolution",
            "inline-box-align",
            "justify-content",
            "left",
            "letter-spacing",
            "line-break",
            "line-height",
            "line-stacking",
            "line-stacking-ruby",
            "line-stacking-shift",
            "line-stacking-strategy",
            "list-style",
            "list-style-image",
            "list-style-position",
            "list-style-type",
            "margin",
            "margin-bottom",
            "margin-left",
            "margin-right",
            "margin-top",
            "marker-offset",
            "marks",
            "marquee-direction",
            "marquee-loop",
            "marquee-play-count",
            "marquee-speed",
            "marquee-style",
            "max-height",
            "max-width",
            "min-height",
            "min-width",
            "move-to",
            "nav-down",
            "nav-index",
            "nav-left",
            "nav-right",
            "nav-up",
            "object-fit",
            "object-position",
            "opacity",
            "order",
            "orphans",
            "outline",
            "outline-color",
            "outline-offset",
            "outline-style",
            "outline-width",
            "overflow",
            "overflow-style",
            "overflow-wrap",
            "overflow-x",
            "overflow-y",
            "padding",
            "padding-bottom",
            "padding-left",
            "padding-right",
            "padding-top",
            "page",
            "page-break-after",
            "page-break-before",
            "page-break-inside",
            "page-policy",
            "pause",
            "pause-after",
            "pause-before",
            "perspective",
            "perspective-origin",
            "pitch",
            "pitch-range",
            "play-during",
            "position",
            "presentation-level",
            "punctuation-trim",
            "quotes",
            "region-break-after",
            "region-break-before",
            "region-break-inside",
            "region-fragment",
            "rendering-intent",
            "resize",
            "rest",
            "rest-after",
            "rest-before",
            "richness",
            "right",
            "rotation",
            "rotation-point",
            "ruby-align",
            "ruby-overhang",
            "ruby-position",
            "ruby-span",
            "shape-image-threshold",
            "shape-inside",
            "shape-margin",
            "shape-outside",
            "size",
            "speak",
            "speak-as",
            "speak-header",
            "speak-numeral",
            "speak-punctuation",
            "speech-rate",
            "stress",
            "string-set",
            "tab-size",
            "table-layout",
            "target",
            "target-name",
            "target-new",
            "target-position",
            "text-align",
            "text-align-last",
            "text-decoration",
            "text-decoration-color",
            "text-decoration-line",
            "text-decoration-skip",
            "text-decoration-style",
            "text-emphasis",
            "text-emphasis-color",
            "text-emphasis-position",
            "text-emphasis-style",
            "text-height",
            "text-indent",
            "text-justify",
            "text-outline",
            "text-overflow",
            "text-shadow",
            "text-size-adjust",
            "text-space-collapse",
            "text-transform",
            "text-underline-position",
            "text-wrap",
            "top",
            "transform",
            "transform-origin",
            "transform-style",
            "transition",
            "transition-delay",
            "transition-duration",
            "transition-property",
            "transition-timing-function",
            "unicode-bidi",
            "vertical-align",
            "visibility",
            "voice-balance",
            "voice-duration",
            "voice-family",
            "voice-pitch",
            "voice-range",
            "voice-rate",
            "voice-stress",
            "voice-volume",
            "volume",
            "white-space",
            "widows",
            "width",
            "word-break",
            "word-spacing",
            "word-wrap",
            "z-index",
            // SVG-specific
            "clip-path",
            "clip-rule",
            "mask",
            "enable-background",
            "filter",
            "flood-color",
            "flood-opacity",
            "lighting-color",
            "stop-color",
            "stop-opacity",
            "pointer-events",
            "color-interpolation",
            "color-interpolation-filters",
            "color-rendering",
            "fill",
            "fill-opacity",
            "fill-rule",
            "image-rendering",
            "marker",
            "marker-end",
            "marker-mid",
            "marker-start",
            "shape-rendering",
            "stroke",
            "stroke-dasharray",
            "stroke-dashoffset",
            "stroke-linecap",
            "stroke-linejoin",
            "stroke-miterlimit",
            "stroke-opacity",
            "stroke-width",
            "text-rendering",
            "baseline-shift",
            "dominant-baseline",
            "glyph-orientation-horizontal",
            "glyph-orientation-vertical",
            "text-anchor",
            "writing-mode"
        ],
        propertyKeywords  = keySet(propertyKeywords_);

    var nonStandardPropertyKeywords_ = [
            "scrollbar-arrow-color",
            "scrollbar-base-color",
            "scrollbar-dark-shadow-color",
            "scrollbar-face-color",
            "scrollbar-highlight-color",
            "scrollbar-shadow-color",
            "scrollbar-3d-light-color",
            "scrollbar-track-color",
            "shape-inside",
            "searchfield-cancel-button",
            "searchfield-decoration",
            "searchfield-results-button",
            "searchfield-results-decoration",
            "zoom"
        ],
        nonStandardPropertyKeywords  = keySet(nonStandardPropertyKeywords_);

    var colorKeywords_ = [
            "aliceblue",
            "antiquewhite",
            "aqua",
            "aquamarine",
            "azure",
            "beige",
            "bisque",
            "black",
            "blanchedalmond",
            "blue",
            "blueviolet",
            "brown",
            "burlywood",
            "cadetblue",
            "chartreuse",
            "chocolate",
            "coral",
            "cornflowerblue",
            "cornsilk",
            "crimson",
            "cyan",
            "darkblue",
            "darkcyan",
            "darkgoldenrod",
            "darkgray",
            "darkgreen",
            "darkkhaki",
            "darkmagenta",
            "darkolivegreen",
            "darkorange",
            "darkorchid",
            "darkred",
            "darksalmon",
            "darkseagreen",
            "darkslateblue",
            "darkslategray",
            "darkturquoise",
            "darkviolet",
            "deeppink",
            "deepskyblue",
            "dimgray",
            "dodgerblue",
            "firebrick",
            "floralwhite",
            "forestgreen",
            "fuchsia",
            "gainsboro",
            "ghostwhite",
            "gold",
            "goldenrod",
            "gray",
            "grey",
            "green",
            "greenyellow",
            "honeydew",
            "hotpink",
            "indianred",
            "indigo",
            "ivory",
            "khaki",
            "lavender",
            "lavenderblush",
            "lawngreen",
            "lemonchiffon",
            "lightblue",
            "lightcoral",
            "lightcyan",
            "lightgoldenrodyellow",
            "lightgray",
            "lightgreen",
            "lightpink",
            "lightsalmon",
            "lightseagreen",
            "lightskyblue",
            "lightslategray",
            "lightsteelblue",
            "lightyellow",
            "lime",
            "limegreen",
            "linen",
            "magenta",
            "maroon",
            "mediumaquamarine",
            "mediumblue",
            "mediumorchid",
            "mediumpurple",
            "mediumseagreen",
            "mediumslateblue",
            "mediumspringgreen",
            "mediumturquoise",
            "mediumvioletred",
            "midnightblue",
            "mintcream",
            "mistyrose",
            "moccasin",
            "navajowhite",
            "navy",
            "oldlace",
            "olive",
            "olivedrab",
            "orange",
            "orangered",
            "orchid",
            "palegoldenrod",
            "palegreen",
            "paleturquoise",
            "palevioletred",
            "papayawhip",
            "peachpuff",
            "peru",
            "pink",
            "plum",
            "powderblue",
            "purple",
            "rebeccapurple",
            "red",
            "rosybrown",
            "royalblue",
            "saddlebrown",
            "salmon",
            "sandybrown",
            "seagreen",
            "seashell",
            "sienna",
            "silver",
            "skyblue",
            "slateblue",
            "slategray",
            "snow",
            "springgreen",
            "steelblue",
            "tan",
            "teal",
            "thistle",
            "tomato",
            "turquoise",
            "violet",
            "wheat",
            "white",
            "whitesmoke",
            "yellow",
            "yellowgreen"
        ],
        colorKeywords  = keySet(colorKeywords_);

    var valueKeywords_ = [
            "above",
            "absolute",
            "activeborder",
            "activecaption",
            "afar",
            "after-white-space",
            "ahead",
            "alias",
            "all",
            "all-scroll",
            "alternate",
            "always",
            "amharic",
            "amharic-abegede",
            "antialiased",
            "appworkspace",
            "arabic-indic",
            "armenian",
            "asterisks",
            "auto",
            "avoid",
            "avoid-column",
            "avoid-page",
            "avoid-region",
            "background",
            "backwards",
            "baseline",
            "below",
            "bidi-override",
            "binary",
            "bengali",
            "blink",
            "block",
            "block-axis",
            "bold",
            "bolder",
            "border",
            "border-box",
            "both",
            "bottom",
            "break",
            "break-all",
            "break-word",
            "button",
            "button-bevel",
            "buttonface",
            "buttonhighlight",
            "buttonshadow",
            "buttontext",
            "cambodian",
            "capitalize",
            "caps-lock-indicator",
            "caption",
            "captiontext",
            "caret",
            "cell",
            "center",
            "checkbox",
            "circle",
            "cjk-earthly-branch",
            "cjk-heavenly-stem",
            "cjk-ideographic",
            "clear",
            "clip",
            "close-quote",
            "col-resize",
            "collapse",
            "column",
            "compact",
            "condensed",
            "contain",
            "content",
            "content-box",
            "context-menu",
            "continuous",
            "copy",
            "cover",
            "crop",
            "cross",
            "crosshair",
            "currentcolor",
            "cursive",
            "dashed",
            "decimal",
            "decimal-leading-zero",
            "default",
            "default-button",
            "destination-atop",
            "destination-in",
            "destination-out",
            "destination-over",
            "devanagari",
            "disc",
            "discard",
            "document",
            "dot-dash",
            "dot-dot-dash",
            "dotted",
            "double",
            "down",
            "e-resize",
            "ease",
            "ease-in",
            "ease-in-out",
            "ease-out",
            "element",
            "ellipse",
            "ellipsis",
            "embed",
            "end",
            "ethiopic",
            "ethiopic-abegede",
            "ethiopic-abegede-am-et",
            "ethiopic-abegede-gez",
            "ethiopic-abegede-ti-er",
            "ethiopic-abegede-ti-et",
            "ethiopic-halehame-aa-er",
            "ethiopic-halehame-aa-et",
            "ethiopic-halehame-am-et",
            "ethiopic-halehame-gez",
            "ethiopic-halehame-om-et",
            "ethiopic-halehame-sid-et",
            "ethiopic-halehame-so-et",
            "ethiopic-halehame-ti-er",
            "ethiopic-halehame-ti-et",
            "ethiopic-halehame-tig",
            "ew-resize",
            "expanded",
            "extra-condensed",
            "extra-expanded",
            "fantasy",
            "fast",
            "fill",
            "fixed",
            "flat",
            "flex",
            "footnotes",
            "forwards",
            "from",
            "geometricPrecision",
            "georgian",
            "graytext",
            "groove",
            "gujarati",
            "gurmukhi",
            "hand",
            "hangul",
            "hangul-consonant",
            "hebrew",
            "help",
            "hidden",
            "hide",
            "higher",
            "highlight",
            "highlighttext",
            "hiragana",
            "hiragana-iroha",
            "horizontal",
            "hsl",
            "hsla",
            "icon",
            "ignore",
            "inactiveborder",
            "inactivecaption",
            "inactivecaptiontext",
            "infinite",
            "infobackground",
            "infotext",
            "inherit",
            "initial",
            "inline",
            "inline-axis",
            "inline-block",
            "inline-flex",
            "inline-table",
            "inset",
            "inside",
            "intrinsic",
            "invert",
            "italic",
            "justify",
            "kannada",
            "katakana",
            "katakana-iroha",
            "keep-all",
            "khmer",
            "landscape",
            "lao",
            "large",
            "larger",
            "left",
            "level",
            "lighter",
            "line-through",
            "linear",
            "lines",
            "list-item",
            "listbox",
            "listitem",
            "local",
            "logical",
            "loud",
            "lower",
            "lower-alpha",
            "lower-armenian",
            "lower-greek",
            "lower-hexadecimal",
            "lower-latin",
            "lower-norwegian",
            "lower-roman",
            "lowercase",
            "ltr",
            "malayalam",
            "match",
            "media-controls-background",
            "media-current-time-display",
            "media-fullscreen-button",
            "media-mute-button",
            "media-play-button",
            "media-return-to-realtime-button",
            "media-rewind-button",
            "media-seek-back-button",
            "media-seek-forward-button",
            "media-slider",
            "media-sliderthumb",
            "media-time-remaining-display",
            "media-volume-slider",
            "media-volume-slider-container",
            "media-volume-sliderthumb",
            "medium",
            "menu",
            "menulist",
            "menulist-button",
            "menulist-text",
            "menulist-textfield",
            "menutext",
            "message-box",
            "middle",
            "min-intrinsic",
            "mix",
            "mongolian",
            "monospace",
            "move",
            "multiple",
            "myanmar",
            "n-resize",
            "narrower",
            "ne-resize",
            "nesw-resize",
            "no-close-quote",
            "no-drop",
            "no-open-quote",
            "no-repeat",
            "none",
            "normal",
            "not-allowed",
            "nowrap",
            "ns-resize",
            "nw-resize",
            "nwse-resize",
            "oblique",
            "octal",
            "open-quote",
            "optimizeLegibility",
            "optimizeSpeed",
            "oriya",
            "oromo",
            "outset",
            "outside",
            "outside-shape",
            "overlay",
            "overline",
            "padding",
            "padding-box",
            "painted",
            "page",
            "paused",
            "persian",
            "plus-darker",
            "plus-lighter",
            "pointer",
            "polygon",
            "portrait",
            "pre",
            "pre-line",
            "pre-wrap",
            "preserve-3d",
            "progress",
            "push-button",
            "radio",
            "read-only",
            "read-write",
            "read-write-plaintext-only",
            "rectangle",
            "region",
            "relative",
            "repeat",
            "repeat-x",
            "repeat-y",
            "reset",
            "reverse",
            "rgb",
            "rgba",
            "ridge",
            "right",
            "round",
            "row-resize",
            "rtl",
            "run-in",
            "running",
            "s-resize",
            "sans-serif",
            "scroll",
            "scrollbar",
            "se-resize",
            "searchfield",
            "searchfield-cancel-button",
            "searchfield-decoration",
            "searchfield-results-button",
            "searchfield-results-decoration",
            "semi-condensed",
            "semi-expanded",
            "separate",
            "serif",
            "show",
            "sidama",
            "single",
            "skip-white-space",
            "slide",
            "slider-horizontal",
            "slider-vertical",
            "sliderthumb-horizontal",
            "sliderthumb-vertical",
            "slow",
            "small",
            "small-caps",
            "small-caption",
            "smaller",
            "solid",
            "somali",
            "source-atop",
            "source-in",
            "source-out",
            "source-over",
            "space",
            "square",
            "square-button",
            "start",
            "static",
            "status-bar",
            "stretch",
            "stroke",
            "sub",
            "subpixel-antialiased",
            "super",
            "sw-resize",
            "table",
            "table-caption",
            "table-cell",
            "table-column",
            "table-column-group",
            "table-footer-group",
            "table-header-group",
            "table-row",
            "table-row-group",
            "telugu",
            "text",
            "text-bottom",
            "text-top",
            "textarea",
            "textfield",
            "thai",
            "thick",
            "thin",
            "threeddarkshadow",
            "threedface",
            "threedhighlight",
            "threedlightshadow",
            "threedshadow",
            "tibetan",
            "tigre",
            "tigrinya-er",
            "tigrinya-er-abegede",
            "tigrinya-et",
            "tigrinya-et-abegede",
            "to",
            "top",
            "transparent",
            "ultra-condensed",
            "ultra-expanded",
            "underline",
            "up",
            "upper-alpha",
            "upper-armenian",
            "upper-greek",
            "upper-hexadecimal",
            "upper-latin",
            "upper-norwegian",
            "upper-roman",
            "uppercase",
            "urdu",
            "url",
            "vertical",
            "vertical-text",
            "visible",
            "visibleFill",
            "visiblePainted",
            "visibleStroke",
            "visual",
            "w-resize",
            "wait",
            "wave",
            "wider",
            "window",
            "windowframe",
            "windowtext",
            "x-large",
            "x-small",
            "xor",
            "xx-large",
            "xx-small"
        ],
        valueKeywords  = keySet(valueKeywords_);

    var fontProperties_ = [
            "font-family",
            "src",
            "unicode-range",
            "font-variant",
            "font-feature-settings",
            "font-stretch",
            "font-weight",
            "font-style"
        ],
        fontProperties  = keySet(fontProperties_);

    var allWords = mediaTypes_
        .concat(mediaFeatures_)
        .concat(propertyKeywords_)
        .concat(nonStandardPropertyKeywords_)
        .concat(colorKeywords_)
        .concat(valueKeywords_);
    codeMirror.registerHelper("hintWords", "css", allWords);

    function tokenCComment(stream, state) {
        var maybeEnd = false,
            ch;
        while ((ch = stream.next()) != null) {
            if (maybeEnd && ch == "/") {
                state.tokenize = null;
                break;
            }
            maybeEnd = (ch == "*");
        }
        return ["comment", "comment"];
    }

    function tokenSGMLComment(stream, state) {
        if (stream.skipTo("-->")) {
            stream.match("-->");
            state.tokenize = null;
        } else {
            stream.skipToEnd();
        }
        return ["comment", "comment"];
    }

    codeMirror.defineMIME("text/css", {
        colorKeywords              : colorKeywords,
        fontProperties             : fontProperties,
        mediaFeatures              : mediaFeatures,
        mediaTypes                 : mediaTypes,
        name                       : "css",
        nonStandardPropertyKeywords: nonStandardPropertyKeywords,
        propertyKeywords           : propertyKeywords,
        tokenHooks                 : {
            "/": function (stream, state) {
                if (!stream.eat("*")) {
                    return false;
                }
                state.tokenize = tokenCComment;
                return tokenCComment(stream, state);
            },
            "<": function (stream, state) {
                if (!stream.match("!--")) {
                    return false;
                }
                state.tokenize = tokenSGMLComment;
                return tokenSGMLComment(stream, state);
            }
        },
        valueKeywords              : valueKeywords
    });

    codeMirror.defineMIME("text/x-scss", {
        allowNested                : true,
        colorKeywords              : colorKeywords,
        fontProperties             : fontProperties,
        helperType                 : "scss",
        mediaFeatures              : mediaFeatures,
        mediaTypes                 : mediaTypes,
        name                       : "css",
        nonStandardPropertyKeywords: nonStandardPropertyKeywords,
        propertyKeywords           : propertyKeywords,
        tokenHooks                 : {
            "#": function (stream) {
                if (!stream.eat("{")) {
                    return false;
                }
                return [null, "interpolation"];
            },
            "$": function (stream) {
                stream.match(/^[\w-]+/);
                if (stream.match(/^\s*:/, false)) {
                    return ["variable-2", "variable-definition"];
                }
                return ["variable-2", "variable"];
            },
            "/": function (stream, state) {
                if (stream.eat("/")) {
                    stream.skipToEnd();
                    return ["comment", "comment"];
                } else if (stream.eat("*")) {
                    state.tokenize = tokenCComment;
                    return tokenCComment(stream, state);
                } else {
                    return ["operator", "operator"];
                }
            },
            ":": function (stream) {
                if (stream.match(/\s*\{/)) {
                    return [null, "{"];
                }
                return false;
            }
        },
        valueKeywords              : valueKeywords
    });

    codeMirror.defineMIME("text/x-less", {
        allowNested                : true,
        colorKeywords              : colorKeywords,
        fontProperties             : fontProperties,
        helperType                 : "less",
        mediaFeatures              : mediaFeatures,
        mediaTypes                 : mediaTypes,
        name                       : "css",
        nonStandardPropertyKeywords: nonStandardPropertyKeywords,
        propertyKeywords           : propertyKeywords,
        tokenHooks                 : {
            "&": function () {
                return ["atom", "atom"];
            },
            "/": function (stream, state) {
                if (stream.eat("/")) {
                    stream.skipToEnd();
                    return ["comment", "comment"];
                } else if (stream.eat("*")) {
                    state.tokenize = tokenCComment;
                    return tokenCComment(stream, state);
                } else {
                    return ["operator", "operator"];
                }
            },
            "@": function (stream) {
                if (stream.match(/^(charset|document|font-face|import|(-(moz|ms|o|webkit)-)?keyframes|media|namespace|page|supports)\b/, false)) {
                    return false;
                }
                stream.eatWhile(/[\w\\\-]/);
                if (stream.match(/^\s*:/, false)) {
                    return ["variable-2", "variable-definition"];
                }
                return ["variable-2", "variable"];
            }
        },
        valueKeywords              : valueKeywords
    });

});
//htmlembedded.js
(function (mod) {
    if (typeof exports == "object" && typeof module == "object") { // CommonJS
        mod(require("../../lib/codemirror"), require("../htmlmixed/htmlmixed"));
    } else if (typeof define == "function" && define.amd) { // AMD
        define([
            "../../lib/codemirror", "../htmlmixed/htmlmixed"
        ], mod);
    } else { // Plain browser env
        mod(codeMirror);
    }
})(function (codeMirror) {
    "use strict";

    codeMirror.defineMode("htmlembedded", function (config, parserConfig) {

        //config settings
        var scriptStartRegex = parserConfig.scriptStartRegex || /^<%/i,
            scriptEndRegex   = parserConfig.scriptEndRegex || /^%>/i;

        //inner modes
        var scriptingMode,
            htmlMixedMode;

        //tokenizer when in html mode
        function htmlDispatch(stream, state) {
            if (stream.match(scriptStartRegex, false)) {
                state.token = scriptingDispatch;
                return scriptingMode.token(stream, state.scriptState);
            } else {
                return htmlMixedMode.token(stream, state.htmlState);
            }
        }

        //tokenizer when in scripting mode
        function scriptingDispatch(stream, state) {
            if (stream.match(scriptEndRegex, false)) {
                state.token = htmlDispatch;
                return htmlMixedMode.token(stream, state.htmlState);
            } else {
                return scriptingMode.token(stream, state.scriptState);
            }
        }


        return {
            copyState : function (state) {
                return {
                    htmlState  : codeMirror.copyState(htmlMixedMode, state.htmlState),
                    scriptState: codeMirror.copyState(scriptingMode, state.scriptState),
                    token      : state.token
                };
            },

            indent    : function (state, textAfter) {
                if (state.token == htmlDispatch) {
                    return htmlMixedMode.indent(state.htmlState, textAfter);
                } else if (scriptingMode.indent) {
                    return scriptingMode.indent(state.scriptState, textAfter);
                }
            },

            innerMode : function (state) {
                if (state.token == scriptingDispatch) {
                    return {mode: scriptingMode, state: state.scriptState};
                } else {
                    return {mode: htmlMixedMode, state: state.htmlState};
                }
            },
            startState: function () {
                scriptingMode = scriptingMode || codeMirror.getMode(config, parserConfig.scriptingModeSpec);
                htmlMixedMode = htmlMixedMode || codeMirror.getMode(config, "htmlmixed");
                return {
                    htmlState  : codeMirror.startState(htmlMixedMode),
                    scriptState: codeMirror.startState(scriptingMode),
                    token      : parserConfig.startOpen
                        ? scriptingDispatch
                        : htmlDispatch
                };
            },

            token     : function (stream, state) {
                return state.token(stream, state);
            }
        };
    }, "htmlmixed");

    codeMirror.defineMIME("application/x-ejs", {
        name             : "htmlembedded",
        scriptingModeSpec: "javascript"
    });
    codeMirror.defineMIME("application/x-aspx", {
        name             : "htmlembedded",
        scriptingModeSpec: "text/x-csharp"
    });
    codeMirror.defineMIME("application/x-jsp", {
        name             : "htmlembedded",
        scriptingModeSpec: "text/x-java"
    });
    codeMirror.defineMIME("application/x-erb", {
        name             : "htmlembedded",
        scriptingModeSpec: "ruby"
    });

});
//htmlmixed.js
(function (mod) {
    if (typeof exports == "object" && typeof module == "object") { // CommonJS
        mod(require("../../lib/codemirror"), require("../xml/xml"), require("../javascript/javascript"), require("../css/css"));
    } else if (typeof define == "function" && define.amd) { // AMD
        define([
            "../../lib/codemirror", "../xml/xml", "../javascript/javascript", "../css/css"
        ], mod);
    } else { // Plain browser env
        mod(codeMirror);
    }
})(function (codeMirror) {
    "use strict";

    codeMirror.defineMode("htmlmixed", function (config, parserConfig) {
        var htmlMode = codeMirror.getMode(config, {
            htmlMode                 : true,
            multilineTagIndentFactor : parserConfig.multilineTagIndentFactor,
            multilineTagIndentPastTag: parserConfig.multilineTagIndentPastTag,
            name                     : "xml"
        });
        var cssMode = codeMirror.getMode(config, "css");

        var scriptTypes     = [],
            scriptTypesConf = parserConfig && parserConfig.scriptTypes;
        scriptTypes.push({
            matches: /^(?:text|application)\/(?:x-)?(?:java|ecma)script$|^$/i,
            mode   : codeMirror.getMode(config, "javascript")
        });
        if (scriptTypesConf) {
            for (var i = 0; i < scriptTypesConf.length; i += 1) {
                var conf = scriptTypesConf[i];
                scriptTypes.push({
                    matches: conf.matches,
                    mode   : conf.mode && codeMirror.getMode(config, conf.mode)
                });
            }
        }
        scriptTypes.push({
            matches: /./,
            mode   : codeMirror.getMode(config, "text/plain")
        });

        function html(stream, state) {
            var tagName = state.htmlState.tagName;
            if (tagName) {
                tagName = tagName.toLowerCase();
            }
            var style = htmlMode.token(stream, state.htmlState);
            if (tagName == "script" && /\btag\b/.test(style) && stream.current() == ">") {
                // Script block: mode to change to depends on type attribute
                var scriptType = stream
                    .string
                    .slice(Math.max(0, stream.pos - 100), stream.pos)
                    .match(/\btype\s*=\s*("[^"]+"|'[^']+'|\S+)[^<]*$/i);
                scriptType = scriptType
                    ? scriptType[1]
                    : "";
                if (scriptType && /[\"\']/.test(scriptType.charAt(0))) {
                    scriptType = scriptType.slice(1, scriptType.length - 1);
                }
                for (var i = 0; i < scriptTypes.length; i += 1) {
                    var tp = scriptTypes[i];
                    if (typeof tp.matches == "string"
                        ? scriptType == tp.matches
                        : tp.matches.test(scriptType)) {
                        if (tp.mode) {
                            state.token      = script;
                            state.localMode  = tp.mode;
                            state.localState = tp.mode.startState && tp
                                .mode
                                .startState(htmlMode.indent(state.htmlState, ""));
                        }
                        break;
                    }
                }
            } else if (tagName == "style" && /\btag\b/.test(style) && stream.current() == ">") {
                state.token      = css;
                state.localMode  = cssMode;
                state.localState = cssMode.startState(htmlMode.indent(state.htmlState, ""));
            }
            return style;
        }
        function maybeBackup(stream, pat, style) {
            var cur = stream.current();
            var close = cur.search(pat),
                m;
            if (close > -1) {
                stream.backUp(cur.length - close);
            } else if (m = cur.match(/<\/?$/)) {
                stream.backUp(cur.length);
                if (!stream.match(pat, false)) {
                    stream.match(cur);
                }
            }
            return style;
        }
        function script(stream, state) {
            if (stream.match(/^<\/\s*script\s*>/i, false)) {
                state.token      = html;
                state.localState = state.localMode = null;
                return null;
            }
            return maybeBackup(stream, /<\/\s*script\s*>/, state.localMode.token(stream, state.localState));
        }
        function css(stream, state) {
            if (stream.match(/^<\/\s*style\s*>/i, false)) {
                state.token      = html;
                state.localState = state.localMode = null;
                return null;
            }
            return maybeBackup(stream, /<\/\s*style\s*>/, cssMode.token(stream, state.localState));
        }

        return {
            copyState : function (state) {
                if (state.localState) {
                    var local = codeMirror.copyState(state.localMode, state.localState);
                }
                return {
                    htmlState : codeMirror.copyState(htmlMode, state.htmlState),
                    localMode : state.localMode,
                    localState: local,
                    token     : state.token
                };
            },

            indent    : function (state, textAfter) {
                if (!state.localMode || /^\s*<\//.test(textAfter)) {
                    return htmlMode.indent(state.htmlState, textAfter);
                } else if (state.localMode.indent) {
                    return state
                        .localMode
                        .indent(state.localState, textAfter);
                } else {
                    return codeMirror.Pass;
                }
            },

            innerMode : function (state) {
                return {
                    mode : state.localMode || htmlMode,
                    state: state.localState || state.htmlState
                };
            },
            startState: function () {
                var state = htmlMode.startState();
                return {htmlState: state, localMode: null, localState: null, token: html};
            },

            token     : function (stream, state) {
                return state.token(stream, state);
            }
        };
    }, "xml", "javascript", "css");

    codeMirror.defineMIME("text/html", "htmlmixed");

});
//javascript.js
(function (mod) {
    if (typeof exports == "object" && typeof module == "object") { // CommonJS
        mod(require("../../lib/codemirror"));
    } else if (typeof define == "function" && define.amd) { // AMD
        define(["../../lib/codemirror"], mod);
    } else { // Plain browser env
        mod(codeMirror);
    }
})(function (codeMirror) {
    "use strict";

    codeMirror.defineMode("javascript", function (config, parserConfig) {
        var indentUnit = config.indentUnit;
        var statementIndent = parserConfig.statementIndent;
        var jsonldMode = parserConfig.jsonld;
        var jsonMode = parserConfig.json || jsonldMode;
        var isTS = parserConfig.typescript;
        var wordRE = parserConfig.wordCharacters || /[\w$\xa1-\uffff]/;

        // Tokenizer

        var keywords = function () {
            function kw(type) {
                return {style: "keyword", type: type};
            }
            var A = kw("keyword a"),
                B = kw("keyword b"),
                C = kw("keyword c");
            var operator = kw("operator"),
                atom     = {
                    style: "atom",
                    type : "atom"
                };

            var jsKeywords = {
                "break"     : C,
                "case"      : kw("case"),
                "catch"     : kw("catch"),
                "class"     : kw("class"),
                "const"     : kw("var"),
                "continue"  : C,
                "debugger"  : C,
                "default"   : kw("default"),
                "delete"    : C,
                "do"        : B,
                "else"      : B,
                "export"    : kw("export"),
                "extends"   : C,
                "false"     : atom,
                "finally"   : B,
                "for"       : kw("for"),
                "function"  : kw("function"),
                "if"        : kw("if"),
                "import"    : kw("import"),
                "in"        : operator,
                "Infinity"  : atom,
                "instanceof": operator,
                "let"       : kw("var"),
                "module"    : kw("module"),
                "NaN"       : atom,
                "new"       : C,
                "null"      : atom,
                "return"    : C,
                "super"     : kw("atom"),
                "switch"    : kw("switch"),
                "this"      : kw("this"),
                "throw"     : C,
                "true"      : atom,
                "try"       : B,
                "typeof"    : operator,
                "undefined" : atom,
                "var"       : kw("var"),
                "while"     : A,
                "with"      : A,
                "yield"     : C
            };

            // Extend the 'normal' keywords with the TypeScript language extensions
            if (isTS) {
                var type = {
                    style: "variable-3",
                    type : "variable"
                };
                var tsKeywords = {
                    "any"        : type,
                    "bool"       : type,
                    "constructor": kw("constructor"),
                    "extends"    : kw("extends"),
                    // object-like things
                    "interface"  : kw("interface"),
                    "number"     : type,
                    "private"    : kw("private"),
                    "protected"  : kw("protected"),

                    // scope modifiers
                    "public"     : kw("public"),
                    "static"     : kw("static"),

                    // types
                    "string"     : type
                };

                for (var attr in tsKeywords) {
                    jsKeywords[attr] = tsKeywords[attr];
                }
            }

            return jsKeywords;
        }();

        var isOperatorChar = /[+\-*&%=<>!?|~^]/;
        var isJsonldKeyword = /^@(context|id|value|language|type|container|list|set|reverse|index|base|vocab|graph)"/;

        function readRegexp(stream) {
            var escaped = false,
                next,
                inSet   = false;
            while ((next = stream.next()) != null) {
                if (!escaped) {
                    if (next == "/" && !inSet) {
                        return;
                    }
                    if (next == "[") {
                        inSet = true;
                    } else if (inSet && next == "]") {
                        inSet = false;
                    }
                }
                escaped = !escaped && next == "\\";
            }
        }

        // Used as scratch variables to communicate multiple values without consing up
        // tons of objects.
        var type,
            content;
        function ret(tp, style, cont) {
            type    = tp;
            content = cont;
            return style;
        }
        function tokenBase(stream, state) {
            var ch = stream.next();
            if (ch == "'" || ch == "'") {
                state.tokenize = tokenString(ch);
                return state.tokenize(stream, state);
            } else if (ch == "." && stream.match(/^\d+(?:[eE][+\-]?\d+)?/)) {
                return ret("number", "number");
            } else if (ch == "." && stream.match("..")) {
                return ret("spread", "meta");
            } else if (/[\[\]{}\(\),;\:\.]/.test(ch)) {
                return ret(ch);
            } else if (ch == "=" && stream.eat(">")) {
                return ret("=>", "operator");
            } else if (ch == "0" && stream.eat(/x/i)) {
                stream.eatWhile(/[\da-f]/i);
                return ret("number", "number");
            } else if (/\d/.test(ch)) {
                stream.match(/^\d*(?:\.\d*)?(?:[eE][+\-]?\d+)?/);
                return ret("number", "number");
            } else if (ch == "/") {
                if (stream.eat("*")) {
                    state.tokenize = tokenComment;
                    return tokenComment(stream, state);
                } else if (stream.eat("/")) {
                    stream.skipToEnd();
                    return ret("comment", "comment");
                } else if (state.lastType == "operator" || state.lastType == "keyword c" || state.lastType == "sof" || /^[\[{}\(,;:]$/.test(state.lastType)) {
                    readRegexp(stream);
                    stream.match(/^\b(([gimyu])(?![gimyu]*\2))+\b/);
                    return ret("regexp", "string-2");
                } else {
                    stream.eatWhile(isOperatorChar);
                    return ret("operator", "operator", stream.current());
                }
            } else if (ch == "`") {
                state.tokenize = tokenQuasi;
                return tokenQuasi(stream, state);
            } else if (ch == "#") {
                stream.skipToEnd();
                return ret("error", "error");
            } else if (isOperatorChar.test(ch)) {
                stream.eatWhile(isOperatorChar);
                return ret("operator", "operator", stream.current());
            } else if (wordRE.test(ch)) {
                stream.eatWhile(wordRE);
                var word  = stream.current(),
                    known = keywords.propertyIsEnumerable(word) && keywords[word];
                return (known && state.lastType != ".")
                    ? ret(known.type, known.style, word)
                    : ret("variable", "variable", word);
            }
        }

        function tokenString(quote) {
            return function (stream, state) {
                var escaped = false,
                    next;
                if (jsonldMode && stream.peek() == "@" && stream.match(isJsonldKeyword)) {
                    state.tokenize = tokenBase;
                    return ret("jsonld-keyword", "meta");
                }
                while ((next = stream.next()) != null) {
                    if (next == quote && !escaped) {
                        break;
                    }
                    escaped = !escaped && next == "\\";
                }
                if (!escaped) {
                    state.tokenize = tokenBase;
                }
                return ret("string", "string");
            };
        }

        function tokenComment(stream, state) {
            var maybeEnd = false,
                ch;
            while (ch = stream.next()) {
                if (ch == "/" && maybeEnd) {
                    state.tokenize = tokenBase;
                    break;
                }
                maybeEnd = (ch == "*");
            }
            return ret("comment", "comment");
        }

        function tokenQuasi(stream, state) {
            var escaped = false,
                next;
            while ((next = stream.next()) != null) {
                if (!escaped && (next == "`" || next == "$" && stream.eat("{"))) {
                    state.tokenize = tokenBase;
                    break;
                }
                escaped = !escaped && next == "\\";
            }
            return ret("quasi", "string-2", stream.current());
        }

        var brackets = "([{}])";
        // This is a crude lookahead trick to try and notice that we're parsing the
        // argument patterns for a fat-arrow function before we actually hit the arrow
        // token. It only works if the arrow is on the same line as the arguments and
        // there's no strange noise (comments) in between. Fallback is to only notice
        // when we hit the arrow, and not declare the arguments as locals for the arrow
        // body.
        function findFatArrow(stream, state) {
            if (state.fatArrowAt) {
                state.fatArrowAt = null;
            }
            var arrow = stream
                .string
                .indexOf("=>", stream.start);
            if (arrow < 0) {
                return;
            }

            var depth        = 0,
                sawSomething = false;
            for (var pos = arrow - 1; pos >= 0; pos -= 1) {
                var ch = stream
                    .string
                    .charAt(pos);
                var bracket = brackets.indexOf(ch);
                if (bracket >= 0 && bracket < 3) {
                    if (!depth) {
                        pos += 1;
                        break;
                    }
                    if (--depth == 0) {
                        break;
                    }
                } else if (bracket >= 3 && bracket < 6) {
                    depth += 1;
                } else if (wordRE.test(ch)) {
                    sawSomething = true;
                } else if (/["'\/]/.test(ch)) {
                    return;
                } else if (sawSomething && !depth) {
                    pos += 1;
                    break;
                }
            }
            if (sawSomething && !depth) {
                state.fatArrowAt = pos;
            }
        }

        // Parser

        var atomicTypes = {
            "atom"          : true,
            "jsonld-keyword": true,
            "number"        : true,
            "regexp"        : true,
            "string"        : true,
            "this"          : true,
            "variable"      : true
        };

        function JSLexical(indented, column, type, align, prev, info) {
            this.indented = indented;
            this.column   = column;
            this.type     = type;
            this.prev     = prev;
            this.info     = info;
            if (align != null) {
                this.align = align;
            }
        }

        function inScope(state, varname) {
            for (var v = state.localVars; v; v = v.next) {
                if (v.name == varname) {
                    return true;
                }
            }
            for (var cx = state.context; cx; cx = cx.prev) {
                for (var v = cx.vars; v; v = v.next) {
                    if (v.name == varname) {
                        return true;
                    }
                }
            }
        }

        function parseJS(state, style, type, content, stream) {
            var cc = state.cc;
            // Communicate our context to the combinators. (Less wasteful than consing up a
            // hundred closures on every call.)
            cx.state  = state;
            cx.stream = stream;
            cx.marked = null,
            cx.cc     = cc;
            cx.style  = style;

            if (!state.lexical.hasOwnProperty("align")) {
                state.lexical.align = true;
            }

            while (true) {
                var combinator = cc.length
                    ? cc.pop()
                    : jsonMode
                        ? expression
                        : statement;
                if (combinator(type, content)) {
                    while (cc.length && cc[cc.length - 1].lex) {
                        cc.pop()();
                    }
                    if (cx.marked) {
                        return cx.marked;
                    }
                    if (type == "variable" && inScope(state, content)) {
                        return "variable-2";
                    }
                    return style;
                }
            }
        }

        // Combinator utils

        var cx = {
            cc    : null,
            column: null,
            marked: null,
            state : null
        };
        function pass() {
            for (var i = arguments.length - 1; i >= 0; i -= 1) {
                cx
                    .cc
                    .push(arguments[i]);
            }
        }
        function cont() {
            pass.apply(null, arguments);
            return true;
        }
        function register(varname) {
            function inList(list) {
                for (var v = list; v; v = v.next) {
                    if (v.name == varname) {
                        return true;
                    }
                }
                return false;
            }
            var state = cx.state;
            if (state.context) {
                cx.marked = "def";
                if (inList(state.localVars)) {
                    return;
                }
                state.localVars = {
                    name: varname,
                    next: state.localVars
                };
            } else {
                if (inList(state.globalVars)) {
                    return;
                }
                if (parserConfig.globalVars) {
                    state.globalVars = {
                        name: varname,
                        next: state.globalVars
                    };
                }
            }
        }

        // Combinators

        var defaultVars = {
            name: "this",
            next: {
                name: "arguments"
            }
        };
        function pushcontext() {
            cx.state.context   = {
                prev: cx.state.context,
                vars: cx.state.localVars
            };
            cx.state.localVars = defaultVars;
        }
        function popcontext() {
            cx.state.localVars = cx.state.context.vars;
            cx.state.context   = cx.state.context.prev;
        }
        function pushlex(type, info) {
            var result = function () {
                var state  = cx.state,
                    indent = state.indented;
                if (state.lexical.type == "stat") {
                    indent = state.lexical.indented;
                } else {
                    for (var outer = state.lexical; outer && outer.type == ")" && outer.align; outer = outer.prev) {
                        indent = outer.indented;
                    }
                }
                state.lexical = new JSLexical(indent, cx.stream.column(), type, null, state.lexical, info);
            };
            result.lex = true;
            return result;
        }
        function poplex() {
            var state = cx.state;
            if (state.lexical.prev) {
                if (state.lexical.type == ")") {
                    state.indented = state.lexical.indented;
                }
                state.lexical = state.lexical.prev;
            }
        }
        poplex.lex = true;

        function expect(wanted) {
            function exp(type) {
                if (type == wanted) {
                    return cont();
                } else if (wanted == ";") {
                    return pass();
                } else {
                    return cont(exp);
                }
            };
            return exp;
        }

        function statement(type, value) {
            if (type == "var") {
                return cont(pushlex("vardef", value.length), vardef, expect(";"), poplex);
            }
            if (type == "keyword a") {
                return cont(pushlex("form"), expression, statement, poplex);
            }
            if (type == "keyword b") {
                return cont(pushlex("form"), statement, poplex);
            }
            if (type == "{") {
                return cont(pushlex("}"), block, poplex);
            }
            if (type == ";") {
                return cont();
            }
            if (type == "if") {
                if (cx.state.lexical.info == "else" && cx.state.cc[cx.state.cc.length - 1] == poplex) {
                    cx
                        .state
                        .cc
                        .pop()();
                }
                return cont(pushlex("form"), expression, statement, poplex, maybeelse);
            }
            if (type == "function") {
                return cont(functiondef);
            }
            if (type == "for") {
                return cont(pushlex("form"), forspec, statement, poplex);
            }
            if (type == "variable") {
                return cont(pushlex("stat"), maybelabel);
            }
            if (type == "switch") {
                return cont(pushlex("form"), expression, pushlex("}", "switch"), expect("{"), block, poplex, poplex);
            }
            if (type == "case") {
                return cont(expression, expect(":"));
            }
            if (type == "default") {
                return cont(expect(":"));
            }
            if (type == "catch") {
                return cont(pushlex("form"), pushcontext, expect("("), funarg, expect(")"), statement, poplex, popcontext);
            }
            if (type == "module") {
                return cont(pushlex("form"), pushcontext, afterModule, popcontext, poplex);
            }
            if (type == "class") {
                return cont(pushlex("form"), className, poplex);
            }
            if (type == "export") {
                return cont(pushlex("form"), afterExport, poplex);
            }
            if (type == "import") {
                return cont(pushlex("form"), afterImport, poplex);
            }
            return pass(pushlex("stat"), expression, expect(";"), poplex);
        }
        function expression(type) {
            return expressionInner(type, false);
        }
        function expressionNoComma(type) {
            return expressionInner(type, true);
        }
        function expressionInner(type, noComma) {
            if (cx.state.fatArrowAt == cx.stream.start) {
                var body = noComma
                    ? arrowBodyNoComma
                    : arrowBody;
                if (type == "(") {
                    return cont(pushcontext, pushlex(")"), commasep(pattern, ")"), poplex, expect("=>"), body, popcontext);
                } else if (type == "variable") {
                    return pass(pushcontext, pattern, expect("=>"), body, popcontext);
                }
            }

            var maybeop = noComma
                ? maybeoperatorNoComma
                : maybeoperatorComma;
            if (atomicTypes.hasOwnProperty(type)) {
                return cont(maybeop);
            }
            if (type == "function") {
                return cont(functiondef, maybeop);
            }
            if (type == "keyword c") {
                return cont(noComma
                    ? maybeexpressionNoComma
                    : maybeexpression);
            }
            if (type == "(") {
                return cont(pushlex(")"), maybeexpression, comprehension, expect(")"), poplex, maybeop);
            }
            if (type == "operator" || type == "spread") {
                return cont(noComma
                    ? expressionNoComma
                    : expression);
            }
            if (type == "[") {
                return cont(pushlex("]"), arrayLiteral, poplex, maybeop);
            }
            if (type == "{") {
                return contCommasep(objprop, "}", null, maybeop);
            }
            if (type == "quasi") {
                return pass(quasi, maybeop);
            }
            return cont();
        }
        function maybeexpression(type) {
            if (type.match(/[;\}\)\],]/)) {
                return pass();
            }
            return pass(expression);
        }
        function maybeexpressionNoComma(type) {
            if (type.match(/[;\}\)\],]/)) {
                return pass();
            }
            return pass(expressionNoComma);
        }

        function maybeoperatorComma(type, value) {
            if (type == ",") {
                return cont(expression);
            }
            return maybeoperatorNoComma(type, value, false);
        }
        function maybeoperatorNoComma(type, value, noComma) {
            var me = noComma == false
                ? maybeoperatorComma
                : maybeoperatorNoComma;
            var expr = noComma == false
                ? expression
                : expressionNoComma;
            if (type == "=>") {
                return cont(pushcontext, noComma
                    ? arrowBodyNoComma
                    : arrowBody,
                popcontext);
            }
            if (type == "operator") {
                if (/\+\+|--/.test(value)) {
                    return cont(me);
                }
                if (value == "?") {
                    return cont(expression, expect(":"), expr);
                }
                return cont(expr);
            }
            if (type == "quasi") {
                return pass(quasi, me);
            }
            if (type == ";") {
                return;
            }
            if (type == "(") {
                return contCommasep(expressionNoComma, ")", "call", me);
            }
            if (type == ".") {
                return cont(property, me);
            }
            if (type == "[") {
                return cont(pushlex("]"), maybeexpression, expect("]"), poplex, me);
            }
        }
        function quasi(type, value) {
            if (type != "quasi") {
                return pass();
            }
            if (value.slice(value.length - 2) != "${") {
                return cont(quasi);
            }
            return cont(expression, continueQuasi);
        }
        function continueQuasi(type) {
            if (type == "}") {
                cx.marked         = "string-2";
                cx.state.tokenize = tokenQuasi;
                return cont(quasi);
            }
        }
        function arrowBody(type) {
            findFatArrow(cx.stream, cx.state);
            return pass(type == "{"
                ? statement
                : expression);
        }
        function arrowBodyNoComma(type) {
            findFatArrow(cx.stream, cx.state);
            return pass(type == "{"
                ? statement
                : expressionNoComma);
        }
        function maybelabel(type) {
            if (type == ":") {
                return cont(poplex, statement);
            }
            return pass(maybeoperatorComma, expect(";"), poplex);
        }
        function property(type) {
            if (type == "variable") {
                cx.marked = "property";
                return cont();
            }
        }
        function objprop(type, value) {
            if (type == "variable" || cx.style == "keyword") {
                cx.marked = "property";
                if (value == "get" || value == "set") {
                    return cont(getterSetter);
                }
                return cont(afterprop);
            } else if (type == "number" || type == "string") {
                cx.marked = jsonldMode
                    ? "property"
                    : (cx.style + " property");
                return cont(afterprop);
            } else if (type == "jsonld-keyword") {
                return cont(afterprop);
            } else if (type == "[") {
                return cont(expression, expect("]"), afterprop);
            }
        }
        function getterSetter(type) {
            if (type != "variable") {
                return pass(afterprop);
            }
            cx.marked = "property";
            return cont(functiondef);
        }
        function afterprop(type) {
            if (type == ":") {
                return cont(expressionNoComma);
            }
            if (type == "(") {
                return pass(functiondef);
            }
        }
        function commasep(what, end) {
            function proceed(type) {
                if (type == ",") {
                    var lex = cx.state.lexical;
                    if (lex.info == "call") {
                        lex.pos = (lex.pos || 0) + 1;
                    }
                    return cont(what, proceed);
                }
                if (type == end) {
                    return cont();
                }
                return cont(expect(end));
            }
            return function (type) {
                if (type == end) {
                    return cont();
                }
                return pass(what, proceed);
            };
        }
        function contCommasep(what, end, info) {
            for (var i = 3; i < arguments.length; i += 1) {
                cx
                    .cc
                    .push(arguments[i]);
            }
            return cont(pushlex(end, info), commasep(what, end), poplex);
        }
        function block(type) {
            if (type == "}") {
                return cont();
            }
            return pass(statement, block);
        }
        function maybetype(type) {
            if (isTS && type == ":") {
                return cont(typedef);
            }
        }
        function typedef(type) {
            if (type == "variable") {
                cx.marked = "variable-3";
                return cont();
            }
        }
        function vardef() {
            return pass(pattern, maybetype, maybeAssign, vardefCont);
        }
        function pattern(type, value) {
            if (type == "variable") {
                register(value);
                return cont();
            }
            if (type == "[") {
                return contCommasep(pattern, "]");
            }
            if (type == "{") {
                return contCommasep(proppattern, "}");
            }
        }
        function proppattern(type, value) {
            if (type == "variable" && !cx.stream.match(/^\s*:/, false)) {
                register(value);
                return cont(maybeAssign);
            }
            if (type == "variable") {
                cx.marked = "property";
            }
            return cont(expect(":"), pattern, maybeAssign);
        }
        function maybeAssign(_type, value) {
            if (value == "=") {
                return cont(expressionNoComma);
            }
        }
        function vardefCont(type) {
            if (type == ",") {
                return cont(vardef);
            }
        }
        function maybeelse(type, value) {
            if (type == "keyword b" && value == "else") {
                return cont(pushlex("form", "else"), statement, poplex);
            }
        }
        function forspec(type) {
            if (type == "(") {
                return cont(pushlex(")"), forspec1, expect(")"), poplex);
            }
        }
        function forspec1(type) {
            if (type == "var") {
                return cont(vardef, expect(";"), forspec2);
            }
            if (type == ";") {
                return cont(forspec2);
            }
            if (type == "variable") {
                return cont(formaybeinof);
            }
            return pass(expression, expect(";"), forspec2);
        }
        function formaybeinof(_type, value) {
            if (value == "in" || value == "of") {
                cx.marked = "keyword";
                return cont(expression);
            }
            return cont(maybeoperatorComma, forspec2);
        }
        function forspec2(type, value) {
            if (type == ";") {
                return cont(forspec3);
            }
            if (value == "in" || value == "of") {
                cx.marked = "keyword";
                return cont(expression);
            }
            return pass(expression, expect(";"), forspec3);
        }
        function forspec3(type) {
            if (type != ")") {
                cont(expression);
            }
        }
        function functiondef(type, value) {
            if (value == "*") {
                cx.marked = "keyword";
                return cont(functiondef);
            }
            if (type == "variable") {
                register(value);
                return cont(functiondef);
            }
            if (type == "(") {
                return cont(pushcontext, pushlex(")"), commasep(funarg, ")"), poplex, statement, popcontext);
            }
        }
        function funarg(type) {
            if (type == "spread") {
                return cont(funarg);
            }
            return pass(pattern, maybetype);
        }
        function className(type, value) {
            if (type == "variable") {
                register(value);
                return cont(classNameAfter);
            }
        }
        function classNameAfter(type, value) {
            if (value == "extends") {
                return cont(expression, classNameAfter);
            }
            if (type == "{") {
                return cont(pushlex("}"), classBody, poplex);
            }
        }
        function classBody(type, value) {
            if (type == "variable" || cx.style == "keyword") {
                cx.marked = "property";
                if (value == "get" || value == "set") {
                    return cont(classGetterSetter, functiondef, classBody);
                }
                return cont(functiondef, classBody);
            }
            if (value == "*") {
                cx.marked = "keyword";
                return cont(classBody);
            }
            if (type == ";") {
                return cont(classBody);
            }
            if (type == "}") {
                return cont();
            }
        }
        function classGetterSetter(type) {
            if (type != "variable") {
                return pass();
            }
            cx.marked = "property";
            return cont();
        }
        function afterModule(type, value) {
            if (type == "string") {
                return cont(statement);
            }
            if (type == "variable") {
                register(value);
                return cont(maybeFrom);
            }
        }
        function afterExport(_type, value) {
            if (value == "*") {
                cx.marked = "keyword";
                return cont(maybeFrom, expect(";"));
            }
            if (value == "default") {
                cx.marked = "keyword";
                return cont(expression, expect(";"));
            }
            return pass(statement);
        }
        function afterImport(type) {
            if (type == "string") {
                return cont();
            }
            return pass(importSpec, maybeFrom);
        }
        function importSpec(type, value) {
            if (type == "{") {
                return contCommasep(importSpec, "}");
            }
            if (type == "variable") {
                register(value);
            }
            return cont();
        }
        function maybeFrom(_type, value) {
            if (value == "from") {
                cx.marked = "keyword";
                return cont(expression);
            }
        }
        function arrayLiteral(type) {
            if (type == "]") {
                return cont();
            }
            return pass(expressionNoComma, maybeArrayComprehension);
        }
        function maybeArrayComprehension(type) {
            if (type == "for") {
                return pass(comprehension, expect("]"));
            }
            if (type == ",") {
                return cont(commasep(maybeexpressionNoComma, "]"));
            }
            return pass(commasep(expressionNoComma, "]"));
        }
        function comprehension(type) {
            if (type == "for") {
                return cont(forspec, comprehension);
            }
            if (type == "if") {
                return cont(expression, comprehension);
            }
        }

        function isContinuedStatement(state, textAfter) {
            return state.lastType == "operator" || state.lastType == "," || isOperatorChar.test(textAfter.charAt(0)) || /[,.]/.test(textAfter.charAt(0));
        }

        // Interface

        return {
            blockCommentEnd  : jsonMode
                ? null
                : "*/",
            blockCommentStart: jsonMode
                ? null
                : "/*",

            electricInput    : /^\s*(?:case .*?:|default:|\{|\})$/,
            fold             : "brace",

            helperType       : jsonMode
                ? "json"
                : "javascript",

            indent           : function (state, textAfter) {
                if (state.tokenize == tokenComment) {
                    return codeMirror.Pass;
                }
                if (state.tokenize != tokenBase) {
                    return 0;
                }
                var firstChar = textAfter && textAfter.charAt(0),
                    lexical   = state.lexical;
                // Kludge to prevent 'maybelse' from blocking lexical scope pops
                if (!/^\s*else\b/.test(textAfter)) {
                    for (var i = state.cc.length - 1; i >= 0; i -= 1) {
                        var c = state.cc[i];
                        if (c == poplex) {
                            lexical = lexical.prev;
                        } else if (c != maybeelse) {
                            break;
                        }
                    }
                    if (lexical.type == "stat" && firstChar == "}") {
                        lexical = lexical.prev;
                    }
                }
                if (statementIndent && lexical.type == ")" && lexical.prev.type == "stat") {
                    lexical = lexical.prev;
                }
                var type    = lexical.type,
                    closing = firstChar == type;

                if (type == "vardef") {
                    return lexical.indented + (state.lastType == "operator" || state.lastType == ","
                        ? lexical.info + 1
                        : 0);
                } else if (type == "form" && firstChar == "{") {
                    return lexical.indented;
                } else if (type == "form") {
                    return lexical.indented + indentUnit;
                } else if (type == "stat") {
                    return lexical.indented + (isContinuedStatement(state, textAfter)
                        ? statementIndent || indentUnit
                        : 0);
                } else if (lexical.info == "switch" && !closing && parserConfig.doubleIndentSwitch != false) {
                    return lexical.indented + (/^(?:case|default)\b/.test(textAfter)
                        ? indentUnit
                        : 2 * indentUnit);
                } else if (lexical.align) {
                    return lexical.column + (closing
                        ? 0
                        : 1);
                } else {
                    return lexical.indented + (closing
                        ? 0
                        : indentUnit);
                }
            },
            jsonldMode       : jsonldMode,
            jsonMode         : jsonMode,
            lineComment      : jsonMode
                ? null
                : "//",
            startState       : function (basecolumn) {
                var state = {
                    cc       : [],
                    context  : parserConfig.localVars && {
                        vars: parserConfig.localVars
                    },
                    indented : 0,
                    lastType : "sof",
                    lexical  : new JSLexical((basecolumn || 0) - indentUnit, 0, "block", false),
                    localVars: parserConfig.localVars,
                    tokenize : tokenBase
                };
                if (parserConfig.globalVars && typeof parserConfig.globalVars == "object") {
                    state.globalVars = parserConfig.globalVars;
                }
                return state;
            },

            token            : function (stream, state) {
                if (stream.sol()) {
                    if (!state.lexical.hasOwnProperty("align")) {
                        state.lexical.align = false;
                    }
                    state.indented = stream.indentation();
                    findFatArrow(stream, state);
                }
                if (state.tokenize != tokenComment && stream.eatSpace()) {
                    return null;
                }
                var style = state.tokenize(stream, state);
                if (type == "comment") {
                    return style;
                }
                state.lastType = type == "operator" && (content == "++" || content == "--")
                    ? "incdec"
                    : type;
                return parseJS(state, style, type, content, stream);
            }
        };
    });

    codeMirror.registerHelper("wordChars", "javascript", /[\w$]/);

    codeMirror.defineMIME("text/javascript", "javascript");
    codeMirror.defineMIME("text/ecmascript", "javascript");
    codeMirror.defineMIME("application/javascript", "javascript");
    codeMirror.defineMIME("application/x-javascript", "javascript");
    codeMirror.defineMIME("application/ecmascript", "javascript");
    codeMirror.defineMIME("application/json", {
        json: true,
        name: "javascript"
    });
    codeMirror.defineMIME("application/x-json", {
        json: true,
        name: "javascript"
    });
    codeMirror.defineMIME("application/ld+json", {
        jsonld: true,
        name  : "javascript"
    });
    codeMirror.defineMIME("text/typescript", {
        name      : "javascript",
        typescript: true
    });
    codeMirror.defineMIME("application/typescript", {
        name      : "javascript",
        typescript: true
    });

});
//matchbrackets.js
(function (mod) {
    if (typeof exports == "object" && typeof module == "object") { // CommonJS
        mod(require("../../lib/codemirror"));
    } else if (typeof define == "function" && define.amd) { // AMD
        define(["../../lib/codemirror"], mod);
    } else { // Plain browser env
        mod(codeMirror);
    }
})(function (codeMirror) {
    var ie_lt8 = /MSIE \d/.test(navigator.userAgent) && (document.documentMode == null || document.documentMode < 8);

    var Pos = codeMirror.Pos;

    var matching = {
        "(": ")>",
        ")": "(<",
        "[": "]>",
        "]": "[<",
        "{": "}>",
        "}": "{<"
    };

    function findMatchingBracket(cm, where, strict, config) {
        var line = cm.getLineHandle(where.line),
            pos  = where.ch - 1;
        var match = (pos >= 0 && matching[
            line
                .text
                .charAt(pos)
        ]) || matching[
            line
                .text
                .charAt(pos += 1)
        ];
        if (!match) {
            return null;
        }
        var dir = match.charAt(1) == ">"
            ? 1
            : -1;
        if (strict && (dir > 0) != (pos == where.ch)) {
            return null;
        }
        var style = cm.getTokenTypeAt(Pos(where.line, pos + 1));

        var found = scanForBracket(cm, Pos(where.line, pos + (dir > 0
            ? 1
            : 0)), dir, style || null, config);
        if (found == null) {
            return null;
        }
        return {
            forward: dir > 0,
            from   : Pos(where.line, pos),
            match  : found && found.ch == match.charAt(0),
            to     : found && found.pos
        };
    }

    // bracketRegex is used to specify which type of bracket to scan should be a
    // regexp, e.g. /[[\]]/
    //
    // Note: If "where" is on an open bracket, then this bracket is ignored.
    //
    // Returns false when no bracket was found, null when it reached maxScanLines
    // and gave up
    function scanForBracket(cm, where, dir, style, config) {
        var maxScanLen = (config && config.maxScanLineLength) || 10000;
        var maxScanLines = (config && config.maxScanLines) || 1000;

        var stack = [];
        var re = config && config.bracketRegex
            ? config.bracketRegex
            : /[(){}[\]]/;
        var lineEnd = dir > 0
            ? Math.min(where.line + maxScanLines, cm.lastLine() + 1)
            : Math.max(cm.firstLine() - 1, where.line - maxScanLines);
        for (var lineNo = where.line; lineNo != lineEnd; lineNo += dir) {
            var line = cm.getLine(lineNo);
            if (!line) {
                continue;
            }
            var pos = dir > 0
                    ? 0
                    : line.length - 1,
                end = dir > 0
                    ? line.length
                    : -1;
            if (line.length > maxScanLen) {
                continue;
            }
            if (lineNo == where.line) {
                pos = where.ch - (dir < 0
                    ? 1
                    : 0);
            }
            for (; pos != end; pos += dir) {
                var ch = line.charAt(pos);
                if (re.test(ch) && (style === undefined || cm.getTokenTypeAt(Pos(lineNo, pos + 1)) == style)) {
                    var match = matching[ch];
                    if ((match.charAt(1) == ">") == (dir > 0)) {
                        stack.push(ch);
                    } else if (!stack.length) {
                        return {
                            ch : ch,
                            pos: Pos(lineNo, pos)
                        };
                    } else {
                        stack.pop();
                    }
                }
            }
        }
        return lineNo - dir == (dir > 0
            ? cm.lastLine()
            : cm.firstLine())
            ? false
            : null;
    }

    function matchBrackets(cm, autoclear, config) {
        // Disable brace matching in long lines, since it'll cause hugely slow updates
        var maxHighlightLen = cm.state.matchBrackets.maxHighlightLineLength || 1000;
        var marks  = [],
            ranges = cm.listSelections();
        for (var i = 0; i < ranges.length; i += 1) {
            var match = ranges[i].empty() && findMatchingBracket(cm, ranges[i].head, false, config);
            if (match && cm.getLine(match.from.line).length <= maxHighlightLen) {
                var style = match.match
                    ? "CodeMirror-matchingbracket"
                    : "CodeMirror-nonmatchingbracket";
                marks.push(cm.markText(match.from, Pos(match.from.line, match.from.ch + 1), {className: style}));
                if (match.to && cm.getLine(match.to.line).length <= maxHighlightLen) {
                    marks.push(cm.markText(match.to, Pos(match.to.line, match.to.ch + 1), {className: style}));
                }
            }
        }

        if (marks.length) {
            // Kludge to work around the IE bug from issue #1193, where text input stops
            // going to the textare whever this fires.
            if (ie_lt8 && cm.state.focused) {
                cm
                    .display
                    .input
                    .focus();
            }

            var clear = function () {
                cm.operation(function () {
                    for (var i = 0; i < marks.length; i += 1) {
                        marks[i].clear();
                    }
                });
            };
            if (autoclear) {
                setTimeout(clear, 800);
            } else {
                return clear;
            }
        }
    }

    var currentlyHighlighted = null;
    function doMatchBrackets(cm) {
        cm.operation(function () {
            if (currentlyHighlighted) {
                currentlyHighlighted();
                currentlyHighlighted = null;
            }
            currentlyHighlighted = matchBrackets(cm, false, cm.state.matchBrackets);
        });
    }

    codeMirror.defineOption("matchBrackets", false, function (cm, val, old) {
        if (old && old != codeMirror.Init) {
            cm.off("cursorActivity", doMatchBrackets);
        }
        if (val) {
            cm.state.matchBrackets = typeof val == "object"
                ? val
                : {};
            cm.on("cursorActivity", doMatchBrackets);
        }
    });

    codeMirror.defineExtension("matchBrackets", function () {
        matchBrackets(this, true);
    });
    codeMirror.defineExtension("findMatchingBracket", function (pos, strict, config) {
        return findMatchingBracket(this, pos, strict, config);
    });
    codeMirror.defineExtension("scanForBracket", function (pos, dir, style, config) {
        return scanForBracket(this, pos, dir, style, config);
    });
});
//xml.js
(function (mod) {
    if (typeof exports == "object" && typeof module == "object") { // CommonJS
        mod(require("../../lib/codemirror"));
    } else if (typeof define == "function" && define.amd) { // AMD
        define(["../../lib/codemirror"], mod);
    } else { // Plain browser env
        mod(codeMirror);
    }
})(function (codeMirror) {
    "use strict";

    codeMirror.defineMode("xml", function (config, parserConfig) {
        var indentUnit = config.indentUnit;
        var multilineTagIndentFactor = parserConfig.multilineTagIndentFactor || 1;
        var multilineTagIndentPastTag = parserConfig.multilineTagIndentPastTag;
        if (multilineTagIndentPastTag == null) {
            multilineTagIndentPastTag = true;
        }

        var Kludges = parserConfig.htmlMode
            ? {
                autoSelfClosers : {
                    "area"    : true,
                    "base"    : true,
                    "br"      : true,
                    "col"     : true,
                    "command" : true,
                    "embed"   : true,
                    "frame"   : true,
                    "hr"      : true,
                    "img"     : true,
                    "input"   : true,
                    "keygen"  : true,
                    "link"    : true,
                    "menuitem": true,
                    "meta"    : true,
                    "param"   : true,
                    "source"  : true,
                    "track"   : true,
                    "wbr"     : true
                },
                implicitlyClosed: {
                    "dd"      : true,
                    "li"      : true,
                    "optgroup": true,
                    "option"  : true,
                    "p"       : true,
                    "rp"      : true,
                    "rt"      : true,
                    "tbody"   : true,
                    "td"      : true,
                    "tfoot"   : true,
                    "th"      : true,
                    "tr"      : true
                },
                contextGrabbers : {
                    "dd"      : {
                        "dd": true,
                        "dt": true
                    },
                    "dt"      : {
                        "dd": true,
                        "dt": true
                    },
                    "li"      : {
                        "li": true
                    },
                    "optgroup": {
                        "optgroup": true
                    },
                    "option"  : {
                        "optgroup": true,
                        "option"  : true
                    },
                    "p"       : {
                        "address"   : true,
                        "article"   : true,
                        "aside"     : true,
                        "blockquote": true,
                        "dir"       : true,
                        "div"       : true,
                        "dl"        : true,
                        "fieldset"  : true,
                        "footer"    : true,
                        "form"      : true,
                        "h1"        : true,
                        "h2"        : true,
                        "h3"        : true,
                        "h4"        : true,
                        "h5"        : true,
                        "h6"        : true,
                        "header"    : true,
                        "hgroup"    : true,
                        "hr"        : true,
                        "menu"      : true,
                        "nav"       : true,
                        "ol"        : true,
                        "p"         : true,
                        "pre"       : true,
                        "section"   : true,
                        "table"     : true,
                        "ul"        : true
                    },
                    "rp"      : {
                        "rp": true,
                        "rt": true
                    },
                    "rt"      : {
                        "rp": true,
                        "rt": true
                    },
                    "tbody"   : {
                        "tbody": true,
                        "tfoot": true
                    },
                    "td"      : {
                        "td": true,
                        "th": true
                    },
                    "tfoot"   : {
                        "tbody": true
                    },
                    "th"      : {
                        "td": true,
                        "th": true
                    },
                    "thead"   : {
                        "tbody": true,
                        "tfoot": true
                    },
                    "tr"      : {
                        "tr": true
                    }
                },
                doNotIndent     : {
                    "pre": true
                },
                allowUnquoted   : true,
                allowMissing    : true,
                caseFold        : true
            }
            : {
                allowMissing    : false,
                allowUnquoted   : false,
                autoSelfClosers : {},
                caseFold        : false,
                contextGrabbers : {},
                doNotIndent     : {},
                implicitlyClosed: {}
            };
        var alignCDATA = parserConfig.alignCDATA;

        // Return variables for tokenizers
        var type,
            setStyle;

        function inText(stream, state) {
            function chain(parser) {
                state.tokenize = parser;
                return parser(stream, state);
            }

            var ch = stream.next();
            if (ch == "<") {
                if (stream.eat("!")) {
                    if (stream.eat("[")) {
                        if (stream.match("CDATA[")) {
                            return chain(inBlock("atom", "]]>"));
                        } else {
                            return null;
                        }
                    } else if (stream.match("--")) {
                        return chain(inBlock("comment", "-->"));
                    } else if (stream.match("DOCTYPE", true, true)) {
                        stream.eatWhile(/[\w\._\-]/);
                        return chain(doctype(1));
                    } else {
                        return null;
                    }
                } else if (stream.eat("?")) {
                    stream.eatWhile(/[\w\._\-]/);
                    state.tokenize = inBlock("meta", "?>");
                    return "meta";
                } else {
                    type           = stream.eat("/")
                        ? "closeTag"
                        : "openTag";
                    state.tokenize = inTag;
                    return "tag bracket";
                }
            } else if (ch == "&") {
                var ok;
                if (stream.eat("#")) {
                    if (stream.eat("x")) {
                        ok = stream.eatWhile(/[a-fA-F\d]/) && stream.eat(";");
                    } else {
                        ok = stream.eatWhile(/[\d]/) && stream.eat(";");
                    }
                } else {
                    ok = stream.eatWhile(/[\w\.\-:]/) && stream.eat(";");
                }
                return ok
                    ? "atom"
                    : "error";
            } else {
                stream.eatWhile(/[^&<]/);
                return null;
            }
        }

        function inTag(stream, state) {
            var ch = stream.next();
            if (ch == ">" || (ch == "/" && stream.eat(">"))) {
                state.tokenize = inText;
                type           = ch == ">"
                    ? "endTag"
                    : "selfcloseTag";
                return "tag bracket";
            } else if (ch == "=") {
                type = "equals";
                return null;
            } else if (ch == "<") {
                state.tokenize = inText;
                state.state    = baseState;
                state.tagName  = state.tagStart = null;
                var next = state.tokenize(stream, state);
                return next
                    ? next + " tag error"
                    : "tag error";
            } else if (/[\'\"]/.test(ch)) {
                state.tokenize       = inAttribute(ch);
                state.stringStartCol = stream.column();
                return state.tokenize(stream, state);
            } else {
                stream.match(/^[^\s\u00a0=<>\"\']*[^\s\u00a0=<>\"\'\/]/);
                return "word";
            }
        }

        function inAttribute(quote) {
            var closure = function (stream, state) {
                while (!stream.eol()) {
                    if (stream.next() == quote) {
                        state.tokenize = inTag;
                        break;
                    }
                }
                return "string";
            };
            closure.isInAttribute = true;
            return closure;
        }

        function inBlock(style, terminator) {
            return function (stream, state) {
                while (!stream.eol()) {
                    if (stream.match(terminator)) {
                        state.tokenize = inText;
                        break;
                    }
                    stream.next();
                }
                return style;
            };
        }
        function doctype(depth) {
            return function (stream, state) {
                var ch;
                while ((ch = stream.next()) != null) {
                    if (ch == "<") {
                        state.tokenize = doctype(depth + 1);
                        return state.tokenize(stream, state);
                    } else if (ch == ">") {
                        if (depth == 1) {
                            state.tokenize = inText;
                            break;
                        } else {
                            state.tokenize = doctype(depth - 1);
                            return state.tokenize(stream, state);
                        }
                    }
                }
                return "meta";
            };
        }

        function Context(state, tagName, startOfLine) {
            this.prev        = state.context;
            this.tagName     = tagName;
            this.indent      = state.indented;
            this.startOfLine = startOfLine;
            if (Kludges.doNotIndent.hasOwnProperty(tagName) || (state.context && state.context.noIndent)) {
                this.noIndent = true;
            }
        }
        function popContext(state) {
            if (state.context) {
                state.context = state.context.prev;
            }
        }
        function maybePopContext(state, nextTagName) {
            var parentTagName;
            while (true) {
                if (!state.context) {
                    return;
                }
                parentTagName = state.context.tagName;
                if (!Kludges.contextGrabbers.hasOwnProperty(parentTagName) || !Kludges.contextGrabbers[parentTagName].hasOwnProperty(nextTagName)) {
                    return;
                }
                popContext(state);
            }
        }

        function baseState(type, stream, state) {
            if (type == "openTag") {
                state.tagStart = stream.column();
                return tagNameState;
            } else if (type == "closeTag") {
                return closeTagNameState;
            } else {
                return baseState;
            }
        }
        function tagNameState(type, stream, state) {
            if (type == "word") {
                state.tagName = stream.current();
                setStyle      = "tag";
                return attrState;
            } else {
                setStyle = "error";
                return tagNameState;
            }
        }
        function closeTagNameState(type, stream, state) {
            if (type == "word") {
                var tagName = stream.current();
                if (state.context && state.context.tagName != tagName && Kludges.implicitlyClosed.hasOwnProperty(state.context.tagName)) {
                    popContext(state);
                }
                if (state.context && state.context.tagName == tagName) {
                    setStyle = "tag";
                    return closeState;
                } else {
                    setStyle = "tag error";
                    return closeStateErr;
                }
            } else {
                setStyle = "error";
                return closeStateErr;
            }
        }

        function closeState(type, _stream, state) {
            if (type != "endTag") {
                setStyle = "error";
                return closeState;
            }
            popContext(state);
            return baseState;
        }
        function closeStateErr(type, stream, state) {
            setStyle = "error";
            return closeState(type, stream, state);
        }

        function attrState(type, _stream, state) {
            if (type == "word") {
                setStyle = "attribute";
                return attrEqState;
            } else if (type == "endTag" || type == "selfcloseTag") {
                var tagName  = state.tagName,
                    tagStart = state.tagStart;
                state.tagName = state.tagStart = null;
                if (type == "selfcloseTag" || Kludges.autoSelfClosers.hasOwnProperty(tagName)) {
                    maybePopContext(state, tagName);
                } else {
                    maybePopContext(state, tagName);
                    state.context = new Context(state, tagName, tagStart == state.indented);
                }
                return baseState;
            }
            setStyle = "error";
            return attrState;
        }
        function attrEqState(type, stream, state) {
            if (type == "equals") {
                return attrValueState;
            }
            if (!Kludges.allowMissing) {
                setStyle = "error";
            }
            return attrState(type, stream, state);
        }
        function attrValueState(type, stream, state) {
            if (type == "string") {
                return attrContinuedState;
            }
            if (type == "word" && Kludges.allowUnquoted) {
                setStyle = "string";
                return attrState;
            }
            setStyle = "error";
            return attrState(type, stream, state);
        }
        function attrContinuedState(type, stream, state) {
            if (type == "string") {
                return attrContinuedState;
            }
            return attrState(type, stream, state);
        }

        return {
            blockCommentEnd  : "-->",
            blockCommentStart: "<!--",

            configuration    : parserConfig.htmlMode
                ? "html"
                : "xml",

            electricInput    : /<\/[\s\w:]+>$/,
            helperType       : parserConfig.htmlMode
                ? "html"
                : "xml",

            indent           : function (state, textAfter, fullLine) {
                var context = state.context;
                // Indent multi-line strings (e.g. css).
                if (state.tokenize.isInAttribute) {
                    if (state.tagStart == state.indented) {
                        return state.stringStartCol + 1;
                    } else {
                        return state.indented + indentUnit;
                    }
                }
                if (context && context.noIndent) {
                    return codeMirror.Pass;
                }
                if (state.tokenize != inTag && state.tokenize != inText) {
                    return fullLine
                        ? fullLine
                            .match(/^(\s*)/)[0]
                            .length
                        : 0;
                }
                // Indent the starts of attribute names.
                if (state.tagName) {
                    if (multilineTagIndentPastTag) {
                        return state.tagStart + state.tagName.length + 2;
                    } else {
                        return state.tagStart + indentUnit * multilineTagIndentFactor;
                    }
                }
                if (alignCDATA && /<!\[CDATA\[/.test(textAfter)) {
                    return 0;
                }
                var tagAfter = textAfter && /^<(\/)?([\w_:\.-]*)/.exec(textAfter);
                if (tagAfter && tagAfter[1]) { // Closing tag spotted
                    while (context) {
                        if (context.tagName == tagAfter[2]) {
                            context = context.prev;
                            break;
                        } else if (Kludges.implicitlyClosed.hasOwnProperty(context.tagName)) {
                            context = context.prev;
                        } else {
                            break;
                        }
                    }
                } else if (tagAfter) { // Opening tag spotted
                    while (context) {
                        var grabbers = Kludges.contextGrabbers[context.tagName];
                        if (grabbers && grabbers.hasOwnProperty(tagAfter[2])) {
                            context = context.prev;
                        } else {
                            break;
                        }
                    }
                }
                while (context && !context.startOfLine) {
                    context = context.prev;
                }
                if (context) {
                    return context.indent + indentUnit;
                } else {
                    return 0;
                }
            },
            startState       : function () {
                return {
                    context : null,
                    indented: 0,
                    state   : baseState,
                    tagName : null,
                    tagStart: null,
                    tokenize: inText
                };
            },

            token            : function (stream, state) {
                if (!state.tagName && stream.sol()) {
                    state.indented = stream.indentation();
                }

                if (stream.eatSpace()) {
                    return null;
                }
                type = null;
                var style = state.tokenize(stream, state);
                if ((style || type) && style != "comment") {
                    setStyle    = null;
                    state.state = state.state(type || style, stream, state);
                    if (setStyle) {
                        style = setStyle == "error"
                            ? style + " error"
                            : setStyle;
                    }
                }
                return style;
            }
        };
    });

    codeMirror.defineMIME("text/xml", "xml");
    codeMirror.defineMIME("application/xml", "xml");
    if (!codeMirror.mimeModes.hasOwnProperty("text/html")) {
        codeMirror.defineMIME("text/html", {
            htmlMode: true,
            name    : "xml"
        });

    }
});