text: /* -*- Mode: Javascript; indent-tabs-mode:nil; js-indent-level: 2 -*- */
  /* vim: set ts=2 et sw=2 tw=80: */
  
  /*************************************************************
   *
   *  MathJax/extensions/TeX/cancel.js
   *  
   *  Implements the \cancel, \bcancel, \xcancel, and \cancelto macros.
   *  
   *  Usage:
   *  
   *      \cancel{math}            % strikeout math from lower left to upper right
   *      \bcancel{math}           % strikeout from upper left to lower right
   *      \xcancel{math}           % strikeout with an X
   *      \cancelto{value}{math}   % strikeout with arrow going to value
   *  
   *  ---------------------------------------------------------------------
   *  
   *  Copyright (c) 2011-2017 The MathJax Consortium
   * 
   *  Licensed under the Apache License, Version 2.0 (the "License");
   *  you may not use this file except in compliance with the License.
   *  You may obtain a copy of the License at
   * 
   *      http://www.apache.org/licenses/LICENSE-2.0
   * 
   *  Unless required by applicable law or agreed to in writing, software
   *  distributed under the License is distributed on an "AS IS" BASIS,
   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *  See the License for the specific language governing permissions and
   *  limitations under the License.
   */
  
  MathJax.Extension["TeX/cancel"] = {
    version: "2.7.2-beta.0",
  
    //
    //  The attributes allowed in \enclose{notation}[attributes]{math}
    //
    ALLOWED: {
      color: 1, mathcolor: 1,
      background: 1, mathbackground: 1,
      padding: 1,
      thickness: 1
    }
  };
  
  MathJax.Hub.Register.StartupHook("TeX Jax Ready",function () {
    var TEX = MathJax.InputJax.TeX,
        MML = MathJax.ElementJax.mml,
        CANCEL = MathJax.Extension["TeX/cancel"];
        
        CANCEL.setAttributes = function (def,attr) {
          if (attr !== "") {
            attr = attr.replace(/ /g,"").split(/,/);
            for (var i = 0, m = attr.length; i < m; i++) {
              var keyvalue = attr[i].split(/[:=]/);
              if (CANCEL.ALLOWED[keyvalue[0]]) {
                if (keyvalue[1] === "true") {keyvalue[1] = true}
                if (keyvalue[1] === "false") {keyvalue[1] = false}
                def[keyvalue[0]] = keyvalue[1];
              }
            }
          }
          return def;
        };
    
    //
    //  Set up macros
    //
    TEX.Definitions.Add({
      macros: {
        cancel:   ['Cancel',MML.NOTATION.UPDIAGONALSTRIKE],
        bcancel:  ['Cancel',MML.NOTATION.DOWNDIAGONALSTRIKE],
        xcancel:  ['Cancel',MML.NOTATION.UPDIAGONALSTRIKE+" "+MML.NOTATION.DOWNDIAGONALSTRIKE],
        cancelto: 'CancelTo'
      }
    },null,true);
  
    TEX.Parse.Augment({
      //
      //  Implement \cancel[attributes]{math},
      //            \bcancel[attributes]{math}, and
      //            \xcancel[attributes]{math}
      //
      Cancel: function(name,notation) {
        var attr = this.GetBrackets(name,""), math = this.ParseArg(name);
        var def = CANCEL.setAttributes({notation: notation},attr);
        this.Push(MML.menclose(math).With(def));
      },
      
      //
      //  Implement \cancelto{value}[attributes]{math}
      //
      CancelTo: function(name,notation) {
        var value = this.ParseArg(name),
            attr = this.GetBrackets(name,""),
            math = this.ParseArg(name);
        var def = CANCEL.setAttributes({notation: MML.NOTATION.UPDIAGONALSTRIKE+" "+MML.NOTATION.UPDIAGONALARROW},attr);
        value = MML.mpadded(value).With({depth:"-.1em",height:"+.1em",voffset:".1em"});
        this.Push(MML.msup(MML.menclose(math).With(def),value));
      }
  
    });
  
    MathJax.Hub.Startup.signal.Post("TeX cancel Ready");
    
  });
  
  MathJax.Ajax.loadComplete("[MathJax]/extensions/TeX/cancel.js");
  