AMScd.js (5346B)
1 /* -*- Mode: Javascript; indent-tabs-mode:nil; js-indent-level: 2 -*- */ 2 /* vim: set ts=2 et sw=2 tw=80: */ 3 4 /************************************************************* 5 * 6 * MathJax/extensions/TeX/AMScd.js 7 * 8 * Implements the CD environment for commutative diagrams. 9 * 10 * --------------------------------------------------------------------- 11 * 12 * Copyright (c) 2013-2015 The MathJax Consortium 13 * 14 * Licensed under the Apache License, Version 2.0 (the "License"); 15 * you may not use this file except in compliance with the License. 16 * You may obtain a copy of the License at 17 * 18 * http://www.apache.org/licenses/LICENSE-2.0 19 * 20 * Unless required by applicable law or agreed to in writing, software 21 * distributed under the License is distributed on an "AS IS" BASIS, 22 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 23 * See the License for the specific language governing permissions and 24 * limitations under the License. 25 */ 26 27 MathJax.Extension["TeX/AMScd"] = { 28 version: "2.6.0", 29 config: MathJax.Hub.CombineConfig("TeX.CD",{ 30 colspace: "5pt", 31 rowspace: "5pt", 32 harrowsize: "2.75em", 33 varrowsize: "1.75em", 34 hideHorizontalLabels: false 35 }) 36 }; 37 38 MathJax.Hub.Register.StartupHook("TeX Jax Ready",function () { 39 var MML = MathJax.ElementJax.mml, 40 TEX = MathJax.InputJax.TeX, 41 STACKITEM = TEX.Stack.Item, 42 TEXDEF = TEX.Definitions, 43 CONFIG = MathJax.Extension["TeX/AMScd"].config; 44 45 TEXDEF.environment.CD = "CD_env"; 46 TEXDEF.special["@"] = "CD_arrow"; 47 TEXDEF.macros.minCDarrowwidth = "CD_minwidth"; 48 TEXDEF.macros.minCDarrowheight = "CD_minheight"; 49 50 TEX.Parse.Augment({ 51 // 52 // Implements \begin{CD}...\end{CD} 53 // 54 CD_env: function (begin) { 55 this.Push(begin); 56 return STACKITEM.array().With({ 57 arraydef: { 58 columnalign: "center", 59 columnspacing: CONFIG.colspace, 60 rowspacing: CONFIG.rowspace, 61 displaystyle: true 62 }, 63 minw: this.stack.env.CD_minw || CONFIG.harrowsize, 64 minh: this.stack.env.CD_minh || CONFIG.varrowsize 65 }); 66 }, 67 68 CD_arrow: function (name) { 69 var c = this.string.charAt(this.i); 70 if (!c.match(/[><VA.|=]/)) {return this.Other(name)} else {this.i++} 71 72 var top = this.stack.Top(); 73 if (!top.isa(STACKITEM.array) || top.data.length) { 74 this.CD_cell(name); 75 top = this.stack.Top(); 76 } 77 // 78 // Add enough cells to place the arrow correctly 79 // 80 var arrowRow = ((top.table.length % 2) === 1); 81 var n = (top.row.length + (arrowRow ? 0 : 1)) % 2; 82 while (n) {this.CD_cell(name); n--} 83 84 var mml; 85 var hdef = {minsize: top.minw, stretchy:true}, 86 vdef = {minsize: top.minh, stretchy:true, symmetric:true, lspace:0, rspace:0}; 87 88 if (c === ".") {} 89 else if (c === "|") {mml = this.mmlToken(MML.mo("\u2225").With(vdef))} 90 else if (c === "=") {mml = this.mmlToken(MML.mo("=").With(hdef))} 91 else { 92 // 93 // for @>>> @<<< @VVV and @AAA, get the arrow and labels 94 // 95 var arrow = {">":"\u2192", "<":"\u2190", V:"\u2193", A:"\u2191"}[c]; 96 var a = this.GetUpTo(name+c,c), 97 b = this.GetUpTo(name+c,c); 98 99 if (c === ">" || c === "<") { 100 // 101 // Lay out horizontal arrows with munderover if it has labels 102 // 103 mml = MML.mo(arrow).With(hdef); 104 if (!a) {a = "\\kern "+top.minw} // minsize needs work 105 if (a || b) { 106 var pad = {width:"+11mu", lspace:"6mu"}; 107 mml = MML.munderover(this.mmlToken(mml)); 108 if (a) { 109 a = TEX.Parse(a,this.stack.env).mml(); 110 mml.SetData(mml.over,MML.mpadded(a).With(pad).With({voffset:".1em"})); 111 } 112 if (b) { 113 b = TEX.Parse(b,this.stack.env).mml(); 114 mml.SetData(mml.under,MML.mpadded(b).With(pad)); 115 } 116 if (CONFIG.hideHorizontalLabels) 117 {mml = MML.mpadded(mml).With({depth:0, height:".67em"})} 118 } 119 } else { 120 // 121 // Lay out vertical arrows with mrow if there are labels 122 // 123 mml = arrow = this.mmlToken(MML.mo(arrow).With(vdef)); 124 if (a || b) { 125 mml = MML.mrow(); 126 if (a) {mml.Append(TEX.Parse("\\scriptstyle\\llap{"+a+"}",this.stack.env).mml())} 127 mml.Append(arrow.With({texClass: MML.TEXCLASS.ORD})); 128 if (b) {mml.Append(TEX.Parse("\\scriptstyle\\rlap{"+b+"}",this.stack.env).mml())} 129 } 130 } 131 } 132 if (mml) {this.Push(mml)}; 133 this.CD_cell(name); 134 }, 135 CD_cell: function (name) { 136 var top = this.stack.Top(); 137 if ((top.table||[]).length % 2 === 0 && (top.row||[]).length === 0) { 138 // 139 // Add a strut to the first cell in even rows to get 140 // better spacing of arrow rows. 141 // 142 this.Push(MML.mpadded().With({height:"8.5pt",depth:"2pt"})); 143 } 144 this.Push(STACKITEM.cell().With({isEntry:true, name:name})); 145 }, 146 147 CD_minwidth: function (name) { 148 this.stack.env.CD_minw = this.GetDimen(name); 149 }, 150 CD_minheight: function (name) { 151 this.stack.env.CD_minh = this.GetDimen(name); 152 } 153 154 }); 155 156 }); 157 158 MathJax.Ajax.loadComplete("[MathJax]/extensions/TeX/AMScd.js");