svgedit/dist/extensions/ext-mathjax.js

var svgEditorExtension_mathjax = (function () {
  'use strict';

  function asyncGeneratorStep(gen, resolve, reject, _next, _throw, key, arg) {
    try {
      var info = gen[key](arg);
      var value = info.value;
    } catch (error) {
      reject(error);
      return;
    }

    if (info.done) {
      resolve(value);
    } else {
      Promise.resolve(value).then(_next, _throw);
    }
  }

  function _asyncToGenerator(fn) {
    return function () {
      var self = this,
          args = arguments;
      return new Promise(function (resolve, reject) {
        var gen = fn.apply(self, args);

        function _next(value) {
          asyncGeneratorStep(gen, resolve, reject, _next, _throw, "next", value);
        }

        function _throw(err) {
          asyncGeneratorStep(gen, resolve, reject, _next, _throw, "throw", err);
        }

        _next(undefined);
      });
    };
  }

  /**
   * Add any of the whitelisted attributes to the script tag.
   * @param {HTMLScriptElement} script
   * @param {PlainObject<string, string>} atts
   * @returns {void}
   */


  function addScriptAtts(script, atts) {
    ['id', 'class', 'type'].forEach(function (prop) {
      if (prop in atts) {
        script[prop] = atts[prop];
      }
    });
  } // Additions by Brett

  function importScript(url) {
    var atts = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};

    if (Array.isArray(url)) {
      return Promise.all(url.map(function (u) {
        return importScript(u, atts);
      }));
    }

    return new Promise(function (resolve, reject) {
      // eslint-disable-line promise/avoid-new
      var script = document.createElement('script');
      /**
       *
       * @returns {void}
       */

      function scriptOnError() {
        reject(new Error("Failed to import: ".concat(url)));
        destructor();
      }
      /**
       *
       * @returns {void}
       */


      function scriptOnLoad() {
        resolve();
        destructor();
      }

      var destructor = function destructor() {
        script.removeEventListener('error', scriptOnError);
        script.removeEventListener('load', scriptOnLoad);
        script.remove();
        script.src = '';
      };

      script.defer = 'defer';
      addScriptAtts(script, atts);
      script.addEventListener('error', scriptOnError);
      script.addEventListener('load', scriptOnLoad);
      script.src = url;
      document.head.append(script);
    });
  }

  var extMathjax = {
    name: 'mathjax',
    init: function init(_ref) {
      var _this = this;

      var $ = _ref.$,
          importLocale = _ref.importLocale;
      return _asyncToGenerator(
      /*#__PURE__*/
      regeneratorRuntime.mark(function _callee2() {
        var strings, svgEditor, svgCanvas, mathjaxSrcSecure, uiStrings, math, locationX, locationY, mathjaxLoaded, saveMath, buttons;
        return regeneratorRuntime.wrap(function _callee2$(_context2) {
          while (1) {
            switch (_context2.prev = _context2.next) {
              case 0:
                saveMath = function _ref2() {
                  var 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 () {
                    var mathjaxMath = $('.MathJax_SVG');
                    var svg = $(mathjaxMath.html());
                    svg.find('use').each(function () {
                      // TODO: find a less pragmatic and more elegant solution to this.
                      var id = $(this).attr('href') ? $(this).attr('href').slice(1) // Works in Chrome.
                      : $(this).attr('xlink:href').slice(1); // Works in Firefox.

                      var glymph = $('#' + id).clone().removeAttr('id');
                      var x = $(this).attr('x');
                      var y = $(this).attr('y');
                      var 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);
                  });
                };

                _context2.next = 3;
                return importLocale();

              case 3:
                strings = _context2.sent;
                svgEditor = _this;
                svgCanvas = svgEditor.canvas; // Configuration of the MathJax extention.
                // This will be added to the head tag before MathJax is loaded.

                /* 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.uiStrings;
                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}
                 */

                buttons = [{
                  id: 'tool_mathjax',
                  type: 'mode',
                  icon: svgEditor.curConfig.extIconsPath + 'mathjax.png',
                  events: {
                    click: function click() {
                      return _asyncToGenerator(
                      /*#__PURE__*/
                      regeneratorRuntime.mark(function _callee() {
                        return regeneratorRuntime.wrap(function _callee$(_context) {
                          while (1) {
                            switch (_context.prev = _context.next) {
                              case 0:
                                // 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)) {
                                  _context.next = 17;
                                  break;
                                }

                                $('<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`

                                _context.prev = 7;
                                _context.next = 10;
                                return importScript(svgEditor.curConfig.extIconsPath + mathjaxSrcSecure);

                              case 10:
                                // 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
                                });
                                _context.next = 17;
                                break;

                              case 13:
                                _context.prev = 13;
                                _context.t0 = _context["catch"](7);
                                console.log('Failed loading MathJax.'); // eslint-disable-line no-console

                                $.alert('Failed loading MathJax. You will not be able to change the mathematics.');

                              case 17:
                              case "end":
                                return _context.stop();
                            }
                          }
                        }, _callee, null, [[7, 13]]);
                      }))();
                    }
                  }
                }];
                return _context2.abrupt("return", {
                  name: strings.name,
                  svgicons: svgEditor.curConfig.extIconsPath + 'mathjax-icons.xml',
                  buttons: strings.buttons.map(function (button, i) {
                    return Object.assign(buttons[i], button);
                  }),
                  mouseDown: function mouseDown() {
                    if (svgCanvas.getMode() === 'mathjax') {
                      return {
                        started: true
                      };
                    }

                    return undefined;
                  },
                  mouseUp: function mouseUp(opts) {
                    if (svgCanvas.getMode() === 'mathjax') {
                      // Get the coordinates from your mouse.
                      var 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: function 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');
                  }
                });

              case 11:
              case "end":
                return _context2.stop();
            }
          }
        }, _callee2);
      }))();
    }
  };

  return extMathjax;

}());