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Annotation of loncom/html/adm/jsMath/extensions/mathchoice.js, revision 1.1

1.1     ! albertel    1: /*
        !             2:  *  extensions/mathchoice.js
        !             3:  *  
        !             4:  *  Part of the jsMath package for mathematics on the web.
        !             5:  *
        !             6:  *  This file implements the 4-way math choice.  It will be loaded
        !             7:  *  automatically when needed, or can be loaded by
        !             8:  *  
        !             9:  *    jsMath.Extension.Require('mathchoice');
        !            10:  *
        !            11:  *  ---------------------------------------------------------------------
        !            12:  *
        !            13:  *  Copyright 2005-2006 by Davide P. Cervone
        !            14:  * 
        !            15:  *  Licensed under the Apache License, Version 2.0 (the "License");
        !            16:  *  you may not use this file except in compliance with the License.
        !            17:  *  You may obtain a copy of the License at
        !            18:  * 
        !            19:  *      http://www.apache.org/licenses/LICENSE-2.0
        !            20:  * 
        !            21:  *  Unless required by applicable law or agreed to in writing, software
        !            22:  *  distributed under the License is distributed on an "AS IS" BASIS,
        !            23:  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
        !            24:  *  See the License for the specific language governing permissions and
        !            25:  *  limitations under the License.
        !            26:  */
        !            27: 
        !            28: /********************************************************************/
        !            29: 
        !            30: jsMath.Add(jsMath.mList.prototype.Atomize,{
        !            31: 
        !            32:   /*
        !            33:    *  Handle a 4-way choice atom.  (Rule 4)
        !            34:    */
        !            35:   choice: function (style,mitem,i,mlist) {
        !            36:     if (style.charAt(style.length-1) == "'") {style = style.slice(0,style.length-1)}
        !            37:     var nlist = []; var M = mitem[style]; if (!M) {M = {type: 'mlist', mlist: []}}
        !            38:     if (M.type == 'mlist') {
        !            39:       M = M.mlist.mlist;
        !            40:       for (var k = 0; k < i; k++) {nlist[k] = mlist[k]}
        !            41:       for (k = 0; k < M.length; k++) {nlist[i+k] = M[k]}
        !            42:       for (k = i+1; k < mlist.length; k++) {nlist[nlist.length] = mlist[k]}
        !            43:       return nlist;
        !            44:     } else {
        !            45:       mlist[i] = jsMath.mItem.Atom('ord',M);
        !            46:       return mlist;
        !            47:     }
        !            48:   }
        !            49: 
        !            50: });
        !            51: 
        !            52: jsMath.Package(jsMath.Parser,{
        !            53: 
        !            54:   macros: {mathchoice: 'MathChoice'},
        !            55:   
        !            56:   /*
        !            57:    *  Implements \mathchoice{}{}{}{}
        !            58:    */
        !            59:   MathChoice: function (name) {
        !            60:     var D  = this.ProcessArg(this.cmd+name); if (this.error) return;
        !            61:     var T  = this.ProcessArg(this.cmd+name); if (this.error) return;
        !            62:     var S  = this.ProcessArg(this.cmd+name); if (this.error) return;
        !            63:     var SS = this.ProcessArg(this.cmd+name); if (this.error) return;
        !            64:     var box = new jsMath.mItem('choice',{D: D, T: T, S: S, SS: SS});
        !            65:     this.mlist.Add(new jsMath.mItem('choice',{D: D, T: T, S: S, SS: SS}));
        !            66:   }
        !            67: 
        !            68: });
        !            69: