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cancel.js (3648B)

      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/TeX/cancel.js
      7  *  
      8  *  Implements the \cancel, \bcancel, \xcancel, and \cancelto macros.
      9  *  
     10  *  Usage:
     11  *  
     12  *      \cancel{math}            % strikeout math from lower left to upper right
     13  *      \bcancel{math}           % strikeout from upper left to lower right
     14  *      \xcancel{math}           % strikeout with an X
     15  *      \cancelto{value}{math}   % strikeout with arrow going to value
     16  *  
     17  *  ---------------------------------------------------------------------
     18  *  
     19  *  Copyright (c) 2011-2015 The MathJax Consortium
     20  * 
     21  *  Licensed under the Apache License, Version 2.0 (the "License");
     22  *  you may not use this file except in compliance with the License.
     23  *  You may obtain a copy of the License at
     24  * 
     25  *      http://www.apache.org/licenses/LICENSE-2.0
     26  * 
     27  *  Unless required by applicable law or agreed to in writing, software
     28  *  distributed under the License is distributed on an "AS IS" BASIS,
     29  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     30  *  See the License for the specific language governing permissions and
     31  *  limitations under the License.
     32  */
     33 
     34 MathJax.Extension["TeX/cancel"] = {
     35   version: "2.6.0",
     36 
     37   //
     38   //  The attributes allowed in \enclose{notation}[attributes]{math}
     39   //
     40   ALLOWED: {
     41     color: 1, mathcolor: 1,
     42     background: 1, mathbackground: 1,
     43     padding: 1,
     44     thickness: 1
     45   }
     46 };
     47 
     48 MathJax.Hub.Register.StartupHook("TeX Jax Ready",function () {
     49   var TEX = MathJax.InputJax.TeX,
     50       MML = MathJax.ElementJax.mml,
     51       CANCEL = MathJax.Extension["TeX/cancel"];
     52       
     53       CANCEL.setAttributes = function (def,attr) {
     54         if (attr !== "") {
     55           attr = attr.replace(/ /g,"").split(/,/);
     56           for (var i = 0, m = attr.length; i < m; i++) {
     57             var keyvalue = attr[i].split(/[:=]/);
     58             if (CANCEL.ALLOWED[keyvalue[0]]) {
     59               if (keyvalue[1] === "true") {keyvalue[1] = true}
     60               if (keyvalue[1] === "false") {keyvalue[1] = false}
     61               def[keyvalue[0]] = keyvalue[1];
     62             }
     63           }
     64         }
     65         return def;
     66       };
     67   
     68   //
     69   //  Set up macros
     70   //
     71   TEX.Definitions.Add({
     72     macros: {
     73       cancel:   ['Cancel',MML.NOTATION.UPDIAGONALSTRIKE],
     74       bcancel:  ['Cancel',MML.NOTATION.DOWNDIAGONALSTRIKE],
     75       xcancel:  ['Cancel',MML.NOTATION.UPDIAGONALSTRIKE+" "+MML.NOTATION.DOWNDIAGONALSTRIKE],
     76       cancelto: 'CancelTo'
     77     }
     78   },null,true);
     79 
     80   TEX.Parse.Augment({
     81     //
     82     //  Implement \cancel[attributes]{math},
     83     //            \bcancel[attributes]{math}, and
     84     //            \xcancel[attributes]{math}
     85     //
     86     Cancel: function(name,notation) {
     87       var attr = this.GetBrackets(name,""), math = this.ParseArg(name);
     88       var def = CANCEL.setAttributes({notation: notation},attr);
     89       this.Push(MML.menclose(math).With(def));
     90     },
     91     
     92     //
     93     //  Implement \cancelto{value}[attributes]{math}
     94     //
     95     CancelTo: function(name,notation) {
     96       var value = this.ParseArg(name),
     97           attr = this.GetBrackets(name,""),
     98           math = this.ParseArg(name);
     99       var def = CANCEL.setAttributes({notation: MML.NOTATION.UPDIAGONALSTRIKE+" "+MML.NOTATION.UPDIAGONALARROW},attr);
    100       value = MML.mpadded(value).With({depth:"-.1em",height:"+.1em",voffset:".1em"});
    101       this.Push(MML.msup(MML.menclose(math).With(def),value));
    102     }
    103 
    104   });
    105 
    106   MathJax.Hub.Startup.signal.Post("TeX cancel Ready");
    107   
    108 });
    109 
    110 MathJax.Ajax.loadComplete("[MathJax]/extensions/TeX/cancel.js");