/* globals MathJax */
/**
* @file ext-mathjax.js
*
* @license MIT
*
* @copyright 2013 Jo Segaert
*
*/
// Todo: Wait for Mathjax 3.0 to get ES Module/avoid global
import {importScript} from '../../external/dynamic-import-polyfill/importModule.js';
export default {
name: 'mathjax',
async init ({$, importLocale}) {
const strings = await importLocale();
const svgEditor = this;
const svgCanvas = svgEditor.canvas;
// Configuration of the MathJax extention.
// This will be added to the head tag before MathJax is loaded.
const /* mathjaxConfiguration = `<script type="text/x-mathjax-config">
MathJax.Hub.Config({
extensions: ['tex2jax.js'],
jax: ['input/TeX', 'output/SVG'],
showProcessingMessages: true,
showMathMenu: false,
showMathMenuMSIE: false,
errorSettings: {
message: ['[Math Processing Error]'],
style: {color: '#CC0000', 'font-style': 'italic'}
},
elements: [],
tex2jax: {
ignoreClass: 'tex2jax_ignore2', processClass: 'tex2jax_process2',
},
TeX: {
extensions: ['AMSmath.js', 'AMSsymbols.js', 'noErrors.js', 'noUndefined.js']
},
SVG: {
}
});
</script>`, */
// mathjaxSrc = 'http://cdn.mathjax.org/mathjax/latest/MathJax.js',
// Had been on https://c328740.ssl.cf1.rackcdn.com/mathjax/latest/MathJax.js?config=TeX-AMS-MML_SVG.js
// Obtained Text-AMS-MML_SVG.js from https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.3/config/TeX-AMS-MML_SVG.js
mathjaxSrcSecure = 'mathjax/MathJax.min.js?config=TeX-AMS-MML_SVG.js',
{uiStrings} = svgEditor;
let
math,
locationX,
locationY,
mathjaxLoaded = false;
// TODO: Implement language support. Move these uiStrings to the locale files and
// the code to the langReady callback. Also i18nize alert and HTML below
$.extend(uiStrings, {
mathjax: {
embed_svg: 'Save as mathematics',
embed_mathml: 'Save as figure',
svg_save_warning: 'The math will be transformed into a figure is ' +
'manipulatable like everything else. You will not be able to ' +
'manipulate the TeX-code anymore.',
mathml_save_warning: 'Advised. The math will be saved as a figure.',
title: 'Mathematics code editor'
}
});
/**
*
* @returns {void}
*/
function saveMath () {
const code = $('#mathjax_code_textarea').val();
// displaystyle to force MathJax NOT to use the inline style. Because it is
// less fancy!
MathJax.Hub.queue.Push(['Text', math, '\\displaystyle{' + code + '}']);
/*
* The MathJax library doesn't want to bloat your webpage so it creates
* every symbol (glymph) you need only once. These are saved in a `<svg>` on
* the top of your html document, just under the body tag. Each glymph has
* its unique id and is saved as a `<path>` in the `<defs>` tag of the `<svg>`
*
* Then when the symbols are needed in the rest of your html document they
* are refferd to by a `<use>` tag.
* Because of bug 1076 we can't just grab the defs tag on the top and add it
* to your formula's `<svg>` and copy the lot. So we have to replace each
* `<use>` tag by its `<path>`.
*/
MathJax.Hub.queue.Push(
function () {
const mathjaxMath = $('.MathJax_SVG');
const svg = $(mathjaxMath.html());
svg.find('use').each(function () {
// TODO: find a less pragmatic and more elegant solution to this.
const id = $(this).attr('href')
? $(this).attr('href').slice(1) // Works in Chrome.
: $(this).attr('xlink:href').slice(1); // Works in Firefox.
const glymph = $('#' + id).clone().removeAttr('id');
const x = $(this).attr('x');
const y = $(this).attr('y');
const transform = $(this).attr('transform');
if (transform && (x || y)) {
glymph.attr('transform', transform + ' translate(' + x + ',' + y + ')');
} else if (transform) {
glymph.attr('transform', transform);
} else if (x || y) {
glymph.attr('transform', 'translate(' + x + ',' + y + ')');
}
$(this).replaceWith(glymph);
});
// Remove the style tag because it interferes with SVG-Edit.
svg.removeAttr('style');
svg.attr('xmlns', 'http://www.w3.org/2000/svg');
svgCanvas.importSvgString($('<div>').append(svg.clone()).html(), true);
svgCanvas.ungroupSelectedElement();
// TODO: To undo the adding of the Formula you now have to undo twice.
// This should only be once!
svgCanvas.moveSelectedElements(locationX, locationY, true);
}
);
}
const buttons = [{
id: 'tool_mathjax',
type: 'mode',
icon: svgEditor.curConfig.extIconsPath + 'mathjax.png',
events: {
async click () {
// Set the mode.
svgCanvas.setMode('mathjax');
// Only load Mathjax when needed, we don't want to strain Svg-Edit any more.
// From this point on it is very probable that it will be needed, so load it.
if (mathjaxLoaded === false) {
$(
'<div id="mathjax">' +
'<!-- Here is where MathJax creates the math -->' +
'<div id="mathjax_creator" class="tex2jax_process" style="display:none">' +
'$${}$$' +
'</div>' +
'<div id="mathjax_overlay"></div>' +
'<div id="mathjax_container">' +
'<div id="tool_mathjax_back" class="toolbar_button">' +
'<button id="tool_mathjax_save">OK</button>' +
'<button id="tool_mathjax_cancel">Cancel</button>' +
'</div>' +
'<fieldset>' +
'<legend id="mathjax_legend">Mathematics Editor</legend>' +
'<label>' +
'<span id="mathjax_explication">Please type your mathematics in ' +
'<a href="https://en.wikipedia.org/wiki/Help:' +
'Displaying_a_formula" target="_blank">TeX</a> code.' +
'</span></label>' +
'<textarea id="mathjax_code_textarea" spellcheck="false"></textarea>' +
'</fieldset>' +
'</div>' +
'</div>'
).insertAfter('#svg_prefs').hide();
// Make the MathEditor draggable.
$('#mathjax_container').draggable({
cancel: 'button,fieldset',
containment: 'window'
});
// Add functionality and picture to cancel button.
$('#tool_mathjax_cancel').prepend($.getSvgIcon('cancel', true))
.on('click touched', function () {
$('#mathjax').hide();
});
// Add functionality and picture to the save button.
$('#tool_mathjax_save').prepend($.getSvgIcon('ok', true))
.on('click touched', function () {
saveMath();
$('#mathjax').hide();
});
// MathJax preprocessing has to ignore most of the page.
$('body').addClass('tex2jax_ignore');
// Now get (and run) the MathJax Library.
// Todo: insert script with modules once widely supported
// and if MathJax (and its `TeX-AMS-MML_SVG.js` dependency) ends up
// providing an ES6 module export: https://github.com/mathjax/MathJax/issues/1998
/*
const modularVersion = !('svgEditor' in window) ||
!window.svgEditor ||
window.svgEditor.modules !== false;
// Add as second argument to `importScript`
{
type: modularVersion
? 'module' // Make this the default when widely supported
: 'text/javascript'
}
// If only using modules, just use this:
const {default: MathJax} = await importModule( // or `import()` when widely supported
svgEditor.curConfig.extIconsPath + mathjaxSrcSecure
);
*/
// We use `extIconsPath` here for now as it does not vary with
// the modular type as does `extPath`
try {
await importScript(svgEditor.curConfig.extIconsPath + mathjaxSrcSecure);
// When MathJax is loaded get the div where the math will be rendered.
MathJax.Hub.queue.Push(function () {
math = MathJax.Hub.getAllJax('#mathjax_creator')[0];
console.log(math); // eslint-disable-line no-console
mathjaxLoaded = true;
console.log('MathJax Loaded'); // eslint-disable-line no-console
});
} catch (e) {
console.log('Failed loading MathJax.'); // eslint-disable-line no-console
$.alert('Failed loading MathJax. You will not be able to change the mathematics.');
}
}
}
}
}];
return {
name: strings.name,
svgicons: svgEditor.curConfig.extIconsPath + 'mathjax-icons.xml',
buttons: strings.buttons.map((button, i) => {
return Object.assign(buttons[i], button);
}),
mouseDown () {
if (svgCanvas.getMode() === 'mathjax') {
return {started: true};
}
return undefined;
},
mouseUp (opts) {
if (svgCanvas.getMode() === 'mathjax') {
// Get the coordinates from your mouse.
const zoom = svgCanvas.getZoom();
// Get the actual coordinate by dividing by the zoom value
locationX = opts.mouse_x / zoom;
locationY = opts.mouse_y / zoom;
$('#mathjax').show();
return {started: false}; // Otherwise the last selected object dissapears.
}
return undefined;
},
callback () {
$('<style>').text(
'#mathjax fieldset{' +
'padding: 5px;' +
'margin: 5px;' +
'border: 1px solid #DDD;' +
'}' +
'#mathjax label{' +
'display: block;' +
'margin: .5em;' +
'}' +
'#mathjax legend {' +
'max-width:195px;' +
'}' +
'#mathjax_overlay {' +
'position: absolute;' +
'top: 0;' +
'left: 0;' +
'right: 0;' +
'bottom: 0;' +
'background-color: black;' +
'opacity: 0.6;' +
'z-index: 20000;' +
'}' +
'#mathjax_container {' +
'position: absolute;' +
'top: 50px;' +
'padding: 10px;' +
'background-color: #B0B0B0;' +
'border: 1px outset #777;' +
'opacity: 1.0;' +
'font-family: Verdana, Helvetica, sans-serif;' +
'font-size: .8em;' +
'z-index: 20001;' +
'}' +
'#tool_mathjax_back {' +
'margin-left: 1em;' +
'overflow: auto;' +
'}' +
'#mathjax_legend{' +
'font-weight: bold;' +
'font-size:1.1em;' +
'}' +
'#mathjax_code_textarea {\\n' +
'margin: 5px .7em;' +
'overflow: hidden;' +
'width: 416px;' +
'display: block;' +
'height: 100px;' +
'}'
).appendTo('head');
// Add the MathJax configuration.
// $(mathjaxConfiguration).appendTo('head');
}
};
}
};