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Diffstat (limited to 'js/mathjax/extensions/TeX/AMScd.js')
| -rw-r--r-- | js/mathjax/extensions/TeX/AMScd.js | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/js/mathjax/extensions/TeX/AMScd.js b/js/mathjax/extensions/TeX/AMScd.js new file mode 100644 index 0000000..d6bee02 --- /dev/null +++ b/js/mathjax/extensions/TeX/AMScd.js @@ -0,0 +1,160 @@ +// @license magnet:?xt=urn:btih:8e4f440f4c65981c5bf93c76d35135ba5064d8b7dn=apache-2.0.txt Apache-2.0 +/* -*- Mode: Javascript; indent-tabs-mode:nil; js-indent-level: 2 -*- */ +/* vim: set ts=2 et sw=2 tw=80: */ + +/************************************************************* + * + * MathJax/extensions/TeX/AMScd.js + * + * Implements the CD environment for commutative diagrams. + * + * --------------------------------------------------------------------- + * + * Copyright (c) 2013-2020 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.Extension["TeX/AMScd"] = { + version: "2.7.9", + config: MathJax.Hub.CombineConfig("TeX.CD",{ + colspace: "5pt", + rowspace: "5pt", + harrowsize: "2.75em", + varrowsize: "1.75em", + hideHorizontalLabels: false + }) +}; + +MathJax.Hub.Register.StartupHook("TeX Jax Ready",function () { + var MML = MathJax.ElementJax.mml, + TEX = MathJax.InputJax.TeX, + STACKITEM = TEX.Stack.Item, + TEXDEF = TEX.Definitions, + CONFIG = MathJax.Extension["TeX/AMScd"].config; + + TEXDEF.environment.CD = "CD_env"; + TEXDEF.special["@"] = "CD_arrow"; + TEXDEF.macros.minCDarrowwidth = "CD_minwidth"; + TEXDEF.macros.minCDarrowheight = "CD_minheight"; + + TEX.Parse.Augment({ + // + // Implements \begin{CD}...\end{CD} + // + CD_env: function (begin) { + this.Push(begin); + return STACKITEM.array().With({ + arraydef: { + columnalign: "center", + columnspacing: CONFIG.colspace, + rowspacing: CONFIG.rowspace, + displaystyle: true + }, + minw: this.stack.env.CD_minw || CONFIG.harrowsize, + minh: this.stack.env.CD_minh || CONFIG.varrowsize + }); + }, + + CD_arrow: function (name) { + var c = this.string.charAt(this.i); + if (!c.match(/[><VA.|=]/)) {return this.Other(name)} else {this.i++} + + var top = this.stack.Top(); + if (!top.isa(STACKITEM.array) || top.data.length) { + this.CD_cell(name); + top = this.stack.Top(); + } + // + // Add enough cells to place the arrow correctly + // + var arrowRow = ((top.table.length % 2) === 1); + var n = (top.row.length + (arrowRow ? 0 : 1)) % 2; + while (n) {this.CD_cell(name); n--} + + var mml; + var hdef = {minsize: top.minw, stretchy:true}, + vdef = {minsize: top.minh, stretchy:true, symmetric:true, lspace:0, rspace:0}; + + if (c === ".") {} + else if (c === "|") {mml = this.mmlToken(MML.mo("\u2225").With(vdef))} + else if (c === "=") {mml = this.mmlToken(MML.mo("=").With(hdef))} + else { + // + // for @>>> @<<< @VVV and @AAA, get the arrow and labels + // + var arrow = {">":"\u2192", "<":"\u2190", V:"\u2193", A:"\u2191"}[c]; + var a = this.GetUpTo(name+c,c), + b = this.GetUpTo(name+c,c); + + if (c === ">" || c === "<") { + // + // Lay out horizontal arrows with munderover if it has labels + // + mml = MML.mo(arrow).With(hdef); + if (!a) {a = "\\kern "+top.minw} // minsize needs work + if (a || b) { + var pad = {width:"+11mu", lspace:"6mu"}; + mml = MML.munderover(this.mmlToken(mml)); + if (a) { + a = TEX.Parse(a,this.stack.env).mml(); + mml.SetData(mml.over,MML.mpadded(a).With(pad).With({voffset:".1em"})); + } + if (b) { + b = TEX.Parse(b,this.stack.env).mml(); + mml.SetData(mml.under,MML.mpadded(b).With(pad)); + } + if (CONFIG.hideHorizontalLabels) + {mml = MML.mpadded(mml).With({depth:0, height:".67em"})} + } + } else { + // + // Lay out vertical arrows with mrow if there are labels + // + mml = arrow = this.mmlToken(MML.mo(arrow).With(vdef)); + if (a || b) { + mml = MML.mrow(); + if (a) {mml.Append(TEX.Parse("\\scriptstyle\\llap{"+a+"}",this.stack.env).mml())} + mml.Append(arrow.With({texClass: MML.TEXCLASS.ORD})); + if (b) {mml.Append(TEX.Parse("\\scriptstyle\\rlap{"+b+"}",this.stack.env).mml())} + } + } + } + if (mml) {this.Push(mml)}; + this.CD_cell(name); + }, + CD_cell: function (name) { + var top = this.stack.Top(); + if ((top.table||[]).length % 2 === 0 && (top.row||[]).length === 0) { + // + // Add a strut to the first cell in even rows to get + // better spacing of arrow rows. + // + this.Push(MML.mpadded().With({height:"8.5pt",depth:"2pt"})); + } + this.Push(STACKITEM.cell().With({isEntry:true, name:name})); + }, + + CD_minwidth: function (name) { + this.stack.env.CD_minw = this.GetDimen(name); + }, + CD_minheight: function (name) { + this.stack.env.CD_minh = this.GetDimen(name); + } + + }); + +}); + +MathJax.Ajax.loadComplete("[MathJax]/extensions/TeX/AMScd.js"); +// @license-end |