69 lines
2.4 KiB
JavaScript
69 lines
2.4 KiB
JavaScript
/*
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* extensions/moreArrows.js
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*
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* Part of the jsMath package for mathematics on the web.
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*
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* This file implements additional arrow macros with under- and
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* overset labels. It can be loaded by
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*
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* jsMath.Extension.Require('moreArrows');
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*
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* or using \require{moreArrows} within a math formula.
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*
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* ---------------------------------------------------------------------
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*
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* Copyright 2005-2006 by Davide P. Cervone
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/********************************************************************/
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jsMath.Extension.Require('leaders');
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jsMath.Package(jsMath.Parser,{
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macros: {
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xrightarrow: ['HandleArrows','rightarrow'],
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xleftarrow: ['HandleArrows','leftarrow'],
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xuprightharpoon: ['HandleArrows','uprightharpoon'],
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xupleftharpoon: ['HandleArrows','upleftharpoon'],
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xdownrightharpoon: ['HandleArrows','downrightharpoon'],
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xdownleftharpoon: ['HandleArrows','downleftharpoon']
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},
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leaders: {
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upleftharpoon: {left: [1,0x28], rep: [2,0x00]},
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uprightharpoon: {rep: [2,0x00], right: [1,0x2A]},
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downleftharpoon: {left: [1,0x29], rep: [2,0x00]},
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downrightharpoon: {rep: [2,0x00], right: [1,0x2B]}
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},
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HandleArrows: function (name,data) {
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var bot = this.GetBrackets(this.cmd+name); if (this.error) return;
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var top = this.ProcessArg(this.cmd+name); if (this.error) return;
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var box = jsMath.Box.Set(top,'S',this.mlist.data.size).Remeasured();
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var w = box.w;
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if (bot) {
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bot = this.Process(bot); if (this.error) return;
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var box = jsMath.Box.Set(bot,'S',this.mlist.data.size).Remeasured();
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w = Math.max(w,box.w);
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}
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var leader = jsMath.Box.Leaders(w+.75,this.leaders[data[0]]);
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box = jsMath.mItem.Atom('op',jsMath.Box.SetList([leader],'T',this.mlist.data.size));
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box.limits = 1; box.sup = top; box.sub = bot;
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this.mlist.Add(box);
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}
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});
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