text: /* -*- Mode: Javascript; indent-tabs-mode:nil; js-indent-level: 2 -*- */
  /* vim: set ts=2 et sw=2 tw=80: */
  
  /*************************************************************
   *
   *  MathJax/extensions/TeX/mathchoice.js
   *  
   *  Implements the \mathchoice macro (rarely used)
   *
   *  ---------------------------------------------------------------------
   *  
   *  Copyright (c) 2009-2017 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.Hub.Register.StartupHook("TeX Jax Ready",function () {
    var VERSION = "2.7.1";
  
    var MML = MathJax.ElementJax.mml;
    var TEX = MathJax.InputJax.TeX;
    var TEXDEF = TEX.Definitions;
    
    TEXDEF.Add({macros: {mathchoice: 'MathChoice'}},null,true);
  
    TEX.Parse.Augment({
      MathChoice: function (name) {
        var D  = this.ParseArg(name),
            T  = this.ParseArg(name),
            S  = this.ParseArg(name),
            SS = this.ParseArg(name);
        this.Push(MML.TeXmathchoice(D,T,S,SS));
      }
    });
    
    MML.TeXmathchoice = MML.mbase.Subclass({
      type: "TeXmathchoice", notParent: true,
      choice: function () {
        if (this.selection != null) return this.selection;
        if (this.choosing) return 2; // prevent infinite loops:  see issue #1151
        this.choosing = true;
        var selection = 0, values = this.getValues("displaystyle","scriptlevel");
        if (values.scriptlevel > 0) {selection = Math.min(3,values.scriptlevel+1)}
          else {selection = (values.displaystyle ? 0 : 1)}
        // only cache the result if we are actually in place in a <math> tag.
        var node = this.inherit; while (node && node.type !== "math") node = node.inherit;
        if (node) this.selection = selection;
        this.choosing = false;
        return selection;
      },
      selected: function () {return this.data[this.choice()]},
      setTeXclass: function (prev) {return this.selected().setTeXclass(prev)},
      isSpacelike: function () {return this.selected().isSpacelike()},
      isEmbellished: function () {return this.selected().isEmbellished()},
      Core: function () {return this.selected()},
      CoreMO: function () {return this.selected().CoreMO()},
      toHTML: function (span) {
        span = this.HTMLcreateSpan(span);
        span.bbox = this.Core().toHTML(span).bbox;
        // Firefox doesn't correctly handle a span with a negatively sized content,
        //   so move marginLeft to main span (this is a hack to get \iiiint to work).
        //   FIXME:  This is a symptom of a more general problem with Firefox, and
        //           there probably needs to be a more general solution (e.g., modifying
        //           HTMLhandleSpace() to get the width and adjust the right margin to
        //           compensate for negative-width contents)
        if (span.firstChild && span.firstChild.style.marginLeft) {
          span.style.marginLeft = span.firstChild.style.marginLeft;
          span.firstChild.style.marginLeft = "";
        }
        return span;
      },
      toSVG: function () {
        var svg = this.Core().toSVG();
        this.SVGsaveData(svg);
        return svg;
      },
      toCommonHTML: function (node) {
        node = this.CHTMLcreateNode(node);
        this.CHTMLhandleStyle(node);
        this.CHTMLhandleColor(node);
        this.CHTMLaddChild(node,this.choice(),{});
        return node;
      },
      toPreviewHTML: function(span) {
        span = this.PHTMLcreateSpan(span);
        this.PHTMLhandleStyle(span);
        this.PHTMLhandleColor(span);
        this.PHTMLaddChild(span,this.choice(),{});
        return span;
      }
    });
    
    MathJax.Hub.Startup.signal.Post("TeX mathchoice Ready");
    
  });
  
  MathJax.Ajax.loadComplete("[MathJax]/extensions/TeX/mathchoice.js");
  