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-jsMath 3.2

    1: /*
    2:  *  extensions/moreArrows.js
    3:  *  
    4:  *  Part of the jsMath package for mathematics on the web.
    5:  *
    6:  *  This file implements additional arrow macros with under- and
    7:  *  overset labels.  It can be loaded by
    8:  *  
    9:  *    jsMath.Extension.Require('moreArrows');
   10:  *
   11:  *  or using \require{moreArrows} within a math formula.
   12:  *
   13:  *  ---------------------------------------------------------------------
   14:  *
   15:  *  Copyright 2005-2006 by Davide P. Cervone
   16:  * 
   17:  *  Licensed under the Apache License, Version 2.0 (the "License");
   18:  *  you may not use this file except in compliance with the License.
   19:  *  You may obtain a copy of the License at
   20:  * 
   21:  *      http://www.apache.org/licenses/LICENSE-2.0
   22:  * 
   23:  *  Unless required by applicable law or agreed to in writing, software
   24:  *  distributed under the License is distributed on an "AS IS" BASIS,
   25:  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   26:  *  See the License for the specific language governing permissions and
   27:  *  limitations under the License.
   28:  */
   29: 
   30: /********************************************************************/
   31: 
   32: jsMath.Script.Start();
   33: 
   34: jsMath.Extension.Require('leaders');
   35: 
   36: jsMath.Package(jsMath.Parser,{
   37: 
   38:   macros: {
   39:     xrightarrow:       ['HandleArrows','rightarrow'],
   40:     xleftarrow:        ['HandleArrows','leftarrow'],
   41:     xuprightharpoon:   ['HandleArrows','uprightharpoon'],
   42:     xupleftharpoon:    ['HandleArrows','upleftharpoon'],
   43:     xdownrightharpoon: ['HandleArrows','downrightharpoon'],
   44:     xdownleftharpoon:  ['HandleArrows','downleftharpoon']
   45:   },
   46:   
   47:   leaders: {
   48:     upleftharpoon:    {left: [1,0x28], rep:   [2,0x00]},
   49:     uprightharpoon:   {rep:  [2,0x00], right: [1,0x2A]},
   50:     downleftharpoon:  {left: [1,0x29], rep:   [2,0x00]},
   51:     downrightharpoon: {rep:  [2,0x00], right: [1,0x2B]}
   52:   },
   53: 
   54:   HandleArrows: function (name,data) {
   55:     var bot = this.GetBrackets(this.cmd+name); if (this.error) return;
   56:     var top = this.ProcessArg(this.cmd+name); if (this.error) return;
   57:     var box = jsMath.Box.Set(top,'S',this.mlist.data.size).Remeasured();
   58:     var w = box.w;
   59:     if (bot) {
   60:       bot = this.Process(bot); if (this.error) return;
   61:       var box = jsMath.Box.Set(bot,'S',this.mlist.data.size).Remeasured();
   62:       w = Math.max(w,box.w);
   63:     }
   64:     var leader = jsMath.Box.Leaders(w+.75,this.leaders[data[0]]);
   65:     box = jsMath.mItem.Atom('op',jsMath.Box.SetList([leader],'T',this.mlist.data.size));
   66:     box.limits = 1; box.sup = top; box.sub = bot;
   67:     this.mlist.Add(box);
   68:   }
   69: 
   70: });
   71: 
   72: jsMath.Script.End();