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jsMath2jax.js (4242B)

      1 /* -*- Mode: Javascript; indent-tabs-mode:nil; js-indent-level: 2 -*- */
      2 /* vim: set ts=2 et sw=2 tw=80: */
      3 
      4 /*************************************************************
      5  *
      6  *  MathJax/extensions/jsMath2jax.js
      7  *  
      8  *  Implements a jsMath to Jax preprocessor that locates jsMath-style
      9  *  <SPAN CLASS="math">...</SPAN> and <DIV CLASS="math">...</DIV> tags
     10  *  and replaces them with SCRIPT tags for processing by MathJax.
     11  *  (Note: use the tex2jax preprocessor to convert TeX delimiters or 
     12  *  custom delimiters to MathJax SCRIPT tags.  This preprocessor is
     13  *  only for the SPAN and DIV form of jsMath delimiters).
     14  *  
     15  *  To use this preprocessor, include "jsMath2jax.js" in the extensions
     16  *  array in your config/MathJax.js file, or the MathJax.Hub.Config() call
     17  *  in your HTML document.
     18  *
     19  *  ---------------------------------------------------------------------
     20  *  
     21  *  Copyright (c) 2010-2015 The MathJax Consortium
     22  * 
     23  *  Licensed under the Apache License, Version 2.0 (the "License");
     24  *  you may not use this file except in compliance with the License.
     25  *  You may obtain a copy of the License at
     26  * 
     27  *      http://www.apache.org/licenses/LICENSE-2.0
     28  * 
     29  *  Unless required by applicable law or agreed to in writing, software
     30  *  distributed under the License is distributed on an "AS IS" BASIS,
     31  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     32  *  See the License for the specific language governing permissions and
     33  *  limitations under the License.
     34  */
     35 
     36 MathJax.Extension.jsMath2jax = {
     37   version: "2.6.0",
     38   
     39   config: {
     40     preview: "TeX"    // Set to "none" to prevent preview strings from being inserted
     41                       //   or to an array that specifies an HTML snippet to use for
     42                       //   the preview.
     43   },
     44   
     45   PreProcess: function (element) {
     46     if (!this.configured) {
     47       this.config = MathJax.Hub.CombineConfig("jsMath2jax",this.config);
     48       if (this.config.Augment) {MathJax.Hub.Insert(this,this.config.Augment)}
     49       if (typeof(this.config.previewTeX) !== "undefined" && !this.config.previewTeX)
     50         {this.config.preview = "none"} // backward compatibility for previewTeX parameter
     51       this.previewClass = MathJax.Hub.config.preRemoveClass;
     52       this.configured = true;
     53     }
     54     if (typeof(element) === "string") {element = document.getElementById(element)}
     55     if (!element) {element = document.body}
     56     var span = element.getElementsByTagName("span"), i;
     57     for (i = span.length-1; i >= 0; i--)
     58       {if (String(span[i].className).match(/(^| )math( |$)/)) {this.ConvertMath(span[i],"")}}
     59     var div = element.getElementsByTagName("div");
     60     for (i = div.length-1; i >= 0; i--)
     61       {if (String(div[i].className).match(/(^| )math( |$)/)) {this.ConvertMath(div[i],"; mode=display")}}
     62   },
     63   
     64   ConvertMath: function (node,mode) {
     65     if (node.getElementsByTagName("script").length === 0) {
     66       var parent = node.parentNode,
     67           script = this.createMathTag(mode,node.innerHTML);
     68       if (node.nextSibling) {parent.insertBefore(script,node.nextSibling)}
     69         else {parent.appendChild(script)}
     70       if (this.config.preview !== "none") {this.createPreview(node)}
     71       parent.removeChild(node);
     72     }
     73   },
     74   
     75   createPreview: function (node) {
     76     var preview = this.config.preview;
     77     if (preview === "TeX") {preview = [this.filterPreview(node.innerHTML)]}
     78     if (preview) {
     79       preview = MathJax.HTML.Element("span",{className: MathJax.Hub.config.preRemoveClass},preview);
     80       node.parentNode.insertBefore(preview,node);
     81     }
     82   },
     83   
     84   createMathTag: function (mode,tex) {
     85     tex = tex.replace(/&lt;/g,"<").replace(/&gt;/g,">").replace(/&amp;/g,"&");
     86     var script = document.createElement("script");
     87     script.type = "math/tex" + mode;
     88     MathJax.HTML.setScript(script,tex);
     89     return script;
     90   },
     91   
     92   filterPreview: function (tex) {return tex}
     93   
     94 };
     95 
     96 // We register the preprocessors with the following priorities:
     97 // - mml2jax.js: 5
     98 // - jsMath2jax.js: 8
     99 // - asciimath2jax.js, tex2jax.js: 10 (default)
    100 // See issues 18 and 484 and the other *2jax.js files.
    101 MathJax.Hub.Register.PreProcessor(["PreProcess",MathJax.Extension.jsMath2jax],8);
    102 MathJax.Ajax.loadComplete("[MathJax]/extensions/jsMath2jax.js");