/*prettydiff.com vertical:true correct:true*/
(function doc() {
    "use strict";
    let diffList      = [];
    const body        = document.getElementsByTagName("body")[0],
        color         = document.getElementById("colorScheme"),
        change        = function doc_colorChange() {
            const name = color[color.selectedIndex].innerHTML.toLowerCase();
            body.setAttribute("class", name);
        },
        colSliderGrab = function doc_colSliderGrab(event) {
            let subOffset            = 0,
                withinRange          = false,
                offset               = 0,
                status               = "ew",
                diffLeft,
                node                 = event.srcElement || event.target;
            const touch              = (event !== null && event.type === "touchstart"),
                diffRight            = (function doc_colSliderGrab_nodeFix() {
                    if (node.nodeName === "li") {
                        node = node.parentNode;
                    }
                    return node.parentNode;
                }()),
                diff                 = diffRight.parentNode,
                lists                = diff.getElementsByTagName("ol"),
                par1                 = lists[2].parentNode,
                par2                 = lists[2].parentNode.parentNode,
                counter              = lists[0].clientWidth,
                data                 = lists[1].clientWidth,
                width                = par1.clientWidth,
                total                = par2.clientWidth,
                min                  = ((total - counter - data - 2) - width),
                max                  = (total - width - counter),
                minAdjust            = min + 15,
                maxAdjust            = max - 20;
            diffLeft                 = diffRight.previousSibling;
            offset                   = par1.offsetLeft - par2.offsetLeft;
            event.preventDefault();
            subOffset                = (par1.scrollLeft > document.body.scrollLeft)
                ? par1.scrollLeft
                : document.body.scrollLeft;
            offset                   = offset - subOffset;
            offset                   = offset + node.clientWidth;
            node.style.cursor        = "ew-resize";
            diff.style.width         = (total / 10) + "em";
            diff.style.display       = "inline-block";
            if (diffLeft.nodeType !== 1) {
                do {
                    diffLeft = diffLeft.previousSibling;
                } while (diffLeft.nodeType !== 1);
            }
            diffLeft.style.display   = "block";
            diffRight.style.width    = (diffRight.clientWidth / 10) + "em";
            diffRight.style.position = "absolute";
            if (touch === true) {
                document.ontouchmove  = function doc_colSliderGrab_Touchboxmove(f) {
                    f.preventDefault();
                    subOffset           = offset - f.touches[0].clientX;
                    if (subOffset > minAdjust && subOffset < maxAdjust) {
                        withinRange = true;
                    }
                    if (withinRange === true && subOffset > maxAdjust) {
                        diffRight.style.width = ((total - counter - 2) / 10) + "em";
                        status                = "e";
                    } else if (withinRange === true && subOffset < minAdjust) {
                        diffRight.style.width = ((total - counter - data - 2) / 10) + "em";
                        status                = "w";
                    } else if (subOffset < max && subOffset > min) {
                        diffRight.style.width = ((width + subOffset) / 10) + "em";
                        status                = "ew";
                    }
                    document.ontouchend = function doc_colSliderGrab_Touchboxmove_drop(f) {
                        f.preventDefault();
                        node.style.cursor    = status + "-resize";
                        document.ontouchmove = null;
                        document.ontouchend  = null;
                    };
                };
                document.ontouchstart = null;
            } else {
                document.onmousemove = function doc_colSliderGrab_Mouseboxmove(f) {
                    f.preventDefault();
                    subOffset          = offset - f.clientX;
                    if (subOffset > minAdjust && subOffset < maxAdjust) {
                        withinRange = true;
                    }
                    if (withinRange === true && subOffset > maxAdjust) {
                        diffRight.style.width = ((total - counter - 2) / 10) + "em";
                        status                = "e";
                    } else if (withinRange === true && subOffset < minAdjust) {
                        diffRight.style.width = ((total - counter - data - 2) / 10) + "em";
                        status                = "w";
                    } else if (subOffset < max && subOffset > min) {
                        diffRight.style.width = ((width + subOffset) / 10) + "em";
                        status                = "ew";
                    }
                    document.onmouseup = function doc_colSliderGrab_Mouseboxmove_drop(f) {
                        f.preventDefault();
                        node.style.cursor    = status + "-resize";
                        document.onmousemove = null;
                        document.onmouseup   = null;
                    };
                };
                document.onmousedown = null;
            }
            return false;
        },
        difffold      = function doc_difffold(event) {
            let a         = 0,
                b         = 0,
                max,
                lists     = [];
            const node    = event.srcElement || event.target,
                title     = node.getAttribute("title").split("line "),
                min       = Number(title[1].substr(0, title[1].indexOf(" "))),
                inner     = node.innerHTML,
                parent    = node.parentNode.parentNode,
                par1      = parent.parentNode,
                listnodes = (parent.getAttribute("class") === "diff")
                    ? parent.getElementsByTagName("ol")
                    : par1.getElementsByTagName("ol"),
                listLen   = listnodes.length;
            do {
                lists.push(listnodes[a].getElementsByTagName("li"));
                a = a + 1;
            } while (a < listLen);
            max           = (max >= lists[0].length)
                ? lists[0].length
                : Number(title[2]);
            if (inner.charAt(0) === "-") {
                node.innerHTML = "+" + inner.substr(1);
                a              = min;
                if (min < max) {
                    do {
                        b = 0;
                        do {
                            lists[b][a].style.display = "none";
                            b                         = b + 1;
                        } while (b < listLen);
                        a = a + 1;
                    } while (a < max);
                }
            } else {
                node.innerHTML = "-" + inner.substr(1);
                a              = min;
                if (min < max) {
                    do {
                        b = 0;
                        do {
                            lists[b][a].style.display = "block";
                            b                         = b + 1;
                        } while (b < listLen);
                        a = a + 1;
                    } while (a < max);
                }
            }
        };
    diffList          = document.getElementsByTagName("ol");
    if (diffList.length > 0) {
        const cells = diffList[0].getElementsByTagName("li"),
            len     = cells.length;
        let a       = 0;
        do {
            if (cells[a].getAttribute("class") === "fold") {
                cells[a].onclick = difffold;
            }
            a = a + 1;
        } while (a < len);
    }
    if (diffList.length > 3) {
        diffList[2].onmousedown  = colSliderGrab;
        diffList[2].ontouchstart = colSliderGrab;
    }
    color.onchange    = change;
}());