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