/* -*- Mode: Javascript; indent-tabs-mode:nil; js-indent-level: 2 -*- */ /* vim: set ts=2 et sw=2 tw=80: */ /************************************************************* * * MathJax/extensions/TeX/newcommand.js * * Implements the \newcommand, \newenvironment and \def * macros, and is loaded automatically when needed. * * --------------------------------------------------------------------- * * Copyright (c) 2009-2013 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/newcommand"] = { version: "2.2" }; MathJax.Hub.Register.StartupHook("TeX Jax Ready",function () { var TEX = MathJax.InputJax.TeX; var TEXDEF = TEX.Definitions; TEXDEF.Add({ macros: { newcommand: 'NewCommand', renewcommand: 'NewCommand', newenvironment: 'NewEnvironment', renewenvironment: 'NewEnvironment', def: 'MacroDef', let: 'Let' } },null,true); TEX.Parse.Augment({ /* * Implement \newcommand{\name}[n]{...} */ NewCommand: function (name) { var cs = this.trimSpaces(this.GetArgument(name)), n = this.GetBrackets(name), opt = this.GetBrackets(name), def = this.GetArgument(name); if (cs.charAt(0) === "\\") {cs = cs.substr(1)} if (!cs.match(/^(.|[a-z]+)$/i)) { TEX.Error(["IllegalControlSequenceName", "Illegal control sequence name for %1",name]); } if (n) { n = this.trimSpaces(n); if (!n.match(/^[0-9]+$/)) { TEX.Error(["IllegalParamNumber", "Illegal number of parameters specified in %1",name]); } } this.setDef(cs,['Macro',def,n,opt]); }, /* * Implement \newenvironment{name}[n][default]{begincmd}{endcmd} */ NewEnvironment: function (name) { var env = this.trimSpaces(this.GetArgument(name)), n = this.GetBrackets(name), bdef = this.GetArgument(name), edef = this.GetArgument(name); if (n) { n = this.trimSpaces(n); if (!n.match(/^[0-9]+$/)) { TEX.Error(["IllegalParamNumber", "Illegal number of parameters specified in %1",name]); } } this.setEnv(env,['BeginEnv','EndEnv',bdef,edef,n]); }, /* * Implement \def command */ MacroDef: function (name) { var cs = this.GetCSname(name), params = this.GetTemplate(name,"\\"+cs), def = this.GetArgument(name); if (!(params instanceof Array)) {this.setDef(cs,['Macro',def,params])} else {this.setDef(cs,['MacroWithTemplate',def].concat(params))} }, /* * Implements the \let command */ Let: function (name) { var cs = this.GetCSname(name), macro; var c = this.GetNext(); if (c === "=") {this.i++; c = this.GetNext()} // // All \let commands create entries in the macros array, but we // have to look in the various mathchar and delimiter arrays if // the source isn't a macro already, and attach the data to a // macro with the proper routine to process it. // // A command of the form \let\cs=char produces a macro equivalent // to \def\cs{char}, which is as close as MathJax can get for this. // So \let\bgroup={ is possible, but doesn't work as it does in TeX. // if (c === "\\") { name = this.GetCSname(name); macro = this.csFindMacro(name); if (!macro) { if (TEXDEF.mathchar0mi[name]) {macro = ["csMathchar0mi",TEXDEF.mathchar0mi[name]]} else if (TEXDEF.mathchar0mo[name]) {macro = ["csMathchar0mo",TEXDEF.mathchar0mo[name]]} else if (TEXDEF.mathchar7[name]) {macro = ["csMathchar7",TEXDEF.mathchar7[name]]} else if (TEXDEF.delimiter["\\"+name] != null) {macro = ["csDelimiter",TEXDEF.delimiter["\\"+name]]} } } else {macro = ["Macro",c]; this.i++} this.setDef(cs,macro); }, /* * Routines to set the macro and environment definitions * (overridden by begingroup to make localized versions) */ setDef: function (name,value) {value.isUser = true; TEXDEF.macros[name] = value}, setEnv: function (name,value) {value.isUser = true; TEXDEF.environment[name] = value}, /* * Get a CS name or give an error */ GetCSname: function (cmd) { var c = this.GetNext(); if (c !== "\\") { TEX.Error(["DoubleBackSlash", "\\ must be followed by a control sequence"]) } var cs = this.trimSpaces(this.GetArgument(cmd)); return cs.substr(1); }, /* * Get a \def parameter template */ GetTemplate: function (cmd,cs) { var c, params = [], n = 0; c = this.GetNext(); var i = this.i; while (this.i < this.string.length) { c = this.GetNext(); if (c === '#') { if (i !== this.i) {params[n] = this.string.substr(i,this.i-i)} c = this.string.charAt(++this.i); if (!c.match(/^[1-9]$/)) { TEX.Error(["CantUseHash2", "Illegal use of # in template for %1",cs]); } if (parseInt(c) != ++n) { TEX.Error(["SequentialParam", "Parameters for %1 must be numbered sequentially",cs]); } i = this.i+1; } else if (c === '{') { if (i !== this.i) {params[n] = this.string.substr(i,this.i-i)} if (params.length > 0) {return [n,params]} else {return n} } this.i++; } TEX.Error(["MissingReplacementString", "Missing replacement string for definition of %1",cmd]); }, /* * Process a macro with a parameter template */ MacroWithTemplate: function (name,text,n,params) { if (n) { var args = []; this.GetNext(); if (params[0] && !this.MatchParam(params[0])) { TEX.Error(["MismatchUseDef", "Use of %1 doesn't match its definition",name]); } for (var i = 0; i < n; i++) {args.push(this.GetParameter(name,params[i+1]))} text = this.SubstituteArgs(args,text); } this.string = this.AddArgs(text,this.string.slice(this.i)); this.i = 0; if (++this.macroCount > TEX.config.MAXMACROS) { TEX.Error(["MaxMacroSub1", "MathJax maximum macro substitution count exceeded; " + "is there a recursive macro call?"]); } }, /* * Process a user-defined environment */ BeginEnv: function (begin,bdef,edef,n) { if (n) { var args = []; for (var i = 0; i < n; i++) {args.push(this.GetArgument("\\begin{"+name+"}"))} bdef = this.SubstituteArgs(args,bdef); edef = this.SubstituteArgs(args,edef); } begin.edef = edef; this.string = this.AddArgs(bdef,this.string.slice(this.i)); this.i = 0; return begin; }, EndEnv: function (begin,row) { this.string = this.AddArgs(begin.edef,this.string.slice(this.i)); this.i = 0 return row; }, /* * Find a single parameter delimited by a trailing template */ GetParameter: function (name,param) { if (param == null) {return this.GetArgument(name)} var i = this.i, j = 0, hasBraces = 0; while (this.i < this.string.length) { if (this.string.charAt(this.i) === '{') { if (this.i === i) {hasBraces = 1} this.GetArgument(name); j = this.i - i; } else if (this.MatchParam(param)) { if (hasBraces) {i++; j -= 2} return this.string.substr(i,j); } else { this.i++; j++; hasBraces = 0; } } TEX.Error(["RunawayArgument","Runaway argument for %1?",name]); }, /* * Check if a template is at the current location. * (The match must be exact, with no spacing differences. TeX is * a little more forgiving than this about spaces after macro names) */ MatchParam: function (param) { if (this.string.substr(this.i,param.length) !== param) {return 0} this.i += param.length; return 1; } }); TEX.Environment = function (name) { TEXDEF.environment[name] = ['BeginEnv','EndEnv'].concat([].slice.call(arguments,1)); TEXDEF.environment[name].isUser = true; } MathJax.Hub.Startup.signal.Post("TeX newcommand Ready"); }); MathJax.Ajax.loadComplete("[MathJax]/extensions/TeX/newcommand.js");