third_party/WebKit/Source/devtools/front_end/cm/javascript.js

   1 // CodeMirror, copyright (c) by Marijn Haverbeke and others
   2 // Distributed under an MIT license: http://codemirror.net/LICENSE
   3
   4 // TODO actually recognize syntax of TypeScript constructs
   5
   6 (function(mod) {
   7   if (typeof exports == "object" && typeof module == "object") // CommonJS
   8     mod(require("../../lib/codemirror"));
   9   else if (typeof define == "function" && define.amd) // AMD
  10     define(["../../lib/codemirror"], mod);
  11   else // Plain browser env
  12     mod(CodeMirror);
  13 })(function(CodeMirror) {
  14 "use strict";
  15
  16 CodeMirror.defineMode("javascript", function(config, parserConfig) {
  17   var indentUnit = config.indentUnit;
  18   var statementIndent = parserConfig.statementIndent;
  19   var jsonldMode = parserConfig.jsonld;
  20   var jsonMode = parserConfig.json || jsonldMode;
  21   var isTS = parserConfig.typescript;
  22   var wordRE = parserConfig.wordCharacters || /[\w$\xa1-\uffff]/;
  23
  24   // Tokenizer
  25
  26   var keywords = function(){
  27     function kw(type) {return {type: type, style: "keyword"};}
  28     var A = kw("keyword a"), B = kw("keyword b"), C = kw("keyword c");
  29     var operator = kw("operator"), atom = {type: "atom", style: "atom"};
  30
  31     var jsKeywords = {
  32       "if": kw("if"), "while": A, "with": A, "else": B, "do": B, "try": B, "finally": B,
  33       "return": C, "break": C, "continue": C, "new": C, "delete": C, "throw": C, "debugger": C,
  34       "var": kw("var"), "const": kw("var"), "let": kw("var"),
  35       "function": kw("function"), "catch": kw("catch"),
  36       "for": kw("for"), "switch": kw("switch"), "case": kw("case"), "default": kw("default"),
  37       "in": operator, "typeof": operator, "instanceof": operator,
  38       "true": atom, "false": atom, "null": atom, "undefined": atom, "NaN": atom, "Infinity": atom,
  39       "this": kw("this"), "class": kw("class"), "super": kw("atom"),
  40       "yield": C, "export": kw("export"), "import": kw("import"), "extends": C
  41     };
  42
  43     // Extend the 'normal' keywords with the TypeScript language extensions
  44     if (isTS) {
  45       var type = {type: "variable", style: "variable-3"};
  46       var tsKeywords = {
  47         // object-like things
  48         "interface": kw("interface"),
  49         "extends": kw("extends"),
  50         "constructor": kw("constructor"),
  51
  52         // scope modifiers
  53         "public": kw("public"),
  54         "private": kw("private"),
  55         "protected": kw("protected"),
  56         "static": kw("static"),
  57
  58         // types
  59         "string": type, "number": type, "bool": type, "any": type
  60       };
  61
  62       for (var attr in tsKeywords) {
  63         jsKeywords[attr] = tsKeywords[attr];
  64       }
  65     }
  66
  67     return jsKeywords;
  68   }();
  69
  70   var isOperatorChar = /[+\-*&%=<>!?|~^]/;
  71   var isJsonldKeyword = /^@(context|id|value|language|type|container|list|set|reverse|index|base|vocab|graph)"/;
  72
  73   function readRegexp(stream) {
  74     var escaped = false, next, inSet = false;
  75     while ((next = stream.next()) != null) {
  76       if (!escaped) {
  77         if (next == "/" && !inSet) return;
  78         if (next == "[") inSet = true;
  79         else if (inSet && next == "]") inSet = false;
  80       }
  81       escaped = !escaped && next == "\\";
  82     }
  83   }
  84
  85   // Used as scratch variables to communicate multiple values without
  86   // consing up tons of objects.
  87   var type, content;
  88   function ret(tp, style, cont) {
  89     type = tp; content = cont;
  90     return style;
  91   }
  92   function tokenBase(stream, state) {
  93     var ch = stream.next();
  94     if (ch == '"' || ch == "'") {
  95       state.tokenize = tokenString(ch);
  96       return state.tokenize(stream, state);
  97     } else if (ch == "." && stream.match(/^\d+(?:[eE][+\-]?\d+)?/)) {
  98       return ret("number", "number");
  99     } else if (ch == "." && stream.match("..")) {
 100       return ret("spread", "meta");
 101     } else if (/[\[\]{}\(\),;\:\.]/.test(ch)) {
 102       return ret(ch);
 103     } else if (ch == "=" && stream.eat(">")) {
 104       return ret("=>", "operator");
 105     } else if (ch == "0" && stream.eat(/x/i)) {
 106       stream.eatWhile(/[\da-f]/i);
 107       return ret("number", "number");
 108     } else if (/\d/.test(ch)) {
 109       stream.match(/^\d*(?:\.\d*)?(?:[eE][+\-]?\d+)?/);
 110       return ret("number", "number");
 111     } else if (ch == "/") {
 112       if (stream.eat("*")) {
 113         state.tokenize = tokenComment;
 114         return tokenComment(stream, state);
 115       } else if (stream.eat("/")) {
 116         stream.skipToEnd();
 117         return ret("comment", "comment");
 118       } else if (state.lastType == "operator" || state.lastType == "keyword c" ||
 119                state.lastType == "sof" || /^[\[{}\(,;:]$/.test(state.lastType)) {
 120         readRegexp(stream);
 121         stream.match(/^\b(([gimyu])(?![gimyu]*\2))+\b/);
 122         return ret("regexp", "string-2");
 123       } else {
 124         stream.eatWhile(isOperatorChar);
 125         return ret("operator", "operator", stream.current());
 126       }
 127     } else if (ch == "`") {
 128       state.tokenize = tokenQuasi;
 129       return tokenQuasi(stream, state);
 130     } else if (ch == "#") {
 131       stream.skipToEnd();
 132       return ret("error", "error");
 133     } else if (isOperatorChar.test(ch)) {
 134       stream.eatWhile(isOperatorChar);
 135       return ret("operator", "operator", stream.current());
 136     } else if (wordRE.test(ch)) {
 137       stream.eatWhile(wordRE);
 138       var word = stream.current(), known = keywords.propertyIsEnumerable(word) && keywords[word];
 139       return (known && state.lastType != ".") ? ret(known.type, known.style, word) :
 140                      ret("variable", "variable", word);
 141     }
 142   }
 143
 144   function tokenString(quote) {
 145     return function(stream, state) {
 146       var escaped = false, next;
 147       if (jsonldMode && stream.peek() == "@" && stream.match(isJsonldKeyword)){
 148         state.tokenize = tokenBase;
 149         return ret("jsonld-keyword", "meta");
 150       }
 151       while ((next = stream.next()) != null) {
 152         if (next == quote && !escaped) break;
 153         escaped = !escaped && next == "\\";
 154       }
 155       if (!escaped) state.tokenize = tokenBase;
 156       return ret("string", "string");
 157     };
 158   }
 159
 160   function tokenComment(stream, state) {
 161     var maybeEnd = false, ch;
 162     while (ch = stream.next()) {
 163       if (ch == "/" && maybeEnd) {
 164         state.tokenize = tokenBase;
 165         break;
 166       }
 167       maybeEnd = (ch == "*");
 168     }
 169     return ret("comment", "comment");
 170   }
 171
 172   function tokenQuasi(stream, state) {
 173     var escaped = false, next;
 174     while ((next = stream.next()) != null) {
 175       if (!escaped && (next == "`" || next == "$" && stream.eat("{"))) {
 176         state.tokenize = tokenBase;
 177         break;
 178       }
 179       escaped = !escaped && next == "\\";
 180     }
 181     return ret("quasi", "string-2", stream.current());
 182   }
 183
 184   var brackets = "([{}])";
 185   // This is a crude lookahead trick to try and notice that we're
 186   // parsing the argument patterns for a fat-arrow function before we
 187   // actually hit the arrow token. It only works if the arrow is on
 188   // the same line as the arguments and there's no strange noise
 189   // (comments) in between. Fallback is to only notice when we hit the
 190   // arrow, and not declare the arguments as locals for the arrow
 191   // body.
 192   function findFatArrow(stream, state) {
 193     if (state.fatArrowAt) state.fatArrowAt = null;
 194     var arrow = stream.string.indexOf("=>", stream.start);
 195     if (arrow < 0) return;
 196
 197     var depth = 0, sawSomething = false;
 198     for (var pos = arrow - 1; pos >= 0; --pos) {
 199       var ch = stream.string.charAt(pos);
 200       var bracket = brackets.indexOf(ch);
 201       if (bracket >= 0 && bracket < 3) {
 202         if (!depth) { ++pos; break; }
 203         if (--depth == 0) break;
 204       } else if (bracket >= 3 && bracket < 6) {
 205         ++depth;
 206       } else if (wordRE.test(ch)) {
 207         sawSomething = true;
 208       } else if (/["'\/]/.test(ch)) {
 209         return;
 210       } else if (sawSomething && !depth) {
 211         ++pos;
 212         break;
 213       }
 214     }
 215     if (sawSomething && !depth) state.fatArrowAt = pos;
 216   }
 217
 218   // Parser
 219
 220   var atomicTypes = {"atom": true, "number": true, "variable": true, "string": true, "regexp": true, "this": true, "jsonld-keyword": true};
 221
 222   function JSLexical(indented, column, type, align, prev, info) {
 223     this.indented = indented;
 224     this.column = column;
 225     this.type = type;
 226     this.prev = prev;
 227     this.info = info;
 228     if (align != null) this.align = align;
 229   }
 230
 231   function inScope(state, varname) {
 232     for (var v = state.localVars; v; v = v.next)
 233       if (v.name == varname) return true;
 234     for (var cx = state.context; cx; cx = cx.prev) {
 235       for (var v = cx.vars; v; v = v.next)
 236         if (v.name == varname) return true;
 237     }
 238   }
 239
 240   function parseJS(state, style, type, content, stream) {
 241     var cc = state.cc;
 242     // Communicate our context to the combinators.
 243     // (Less wasteful than consing up a hundred closures on every call.)
 244     cx.state = state; cx.stream = stream; cx.marked = null, cx.cc = cc; cx.style = style;
 245
 246     if (!state.lexical.hasOwnProperty("align"))
 247       state.lexical.align = true;
 248
 249     while(true) {
 250       var combinator = cc.length ? cc.pop() : jsonMode ? expression : statement;
 251       if (combinator(type, content)) {
 252         while(cc.length && cc[cc.length - 1].lex)
 253           cc.pop()();
 254         if (cx.marked) return cx.marked;
 255         if (type == "variable" && inScope(state, content)) return "variable-2";
 256         return style;
 257       }
 258     }
 259   }
 260
 261   // Combinator utils
 262
 263   var cx = {state: null, column: null, marked: null, cc: null};
 264   function pass() {
 265     for (var i = arguments.length - 1; i >= 0; i--) cx.cc.push(arguments[i]);
 266   }
 267   function cont() {
 268     pass.apply(null, arguments);
 269     return true;
 270   }
 271   function register(varname) {
 272     function inList(list) {
 273       for (var v = list; v; v = v.next)
 274         if (v.name == varname) return true;
 275       return false;
 276     }
 277     var state = cx.state;
 278     if (state.context) {
 279       cx.marked = "def";
 280       if (inList(state.localVars)) return;
 281       state.localVars = {name: varname, next: state.localVars};
 282     } else {
 283       if (inList(state.globalVars)) return;
 284       if (parserConfig.globalVars)
 285         state.globalVars = {name: varname, next: state.globalVars};
 286     }
 287   }
 288
 289   // Combinators
 290
 291   var defaultVars = {name: "this", next: {name: "arguments"}};
 292   function pushcontext() {
 293     cx.state.context = {prev: cx.state.context, vars: cx.state.localVars};
 294     cx.state.localVars = defaultVars;
 295   }
 296   function popcontext() {
 297     cx.state.localVars = cx.state.context.vars;
 298     cx.state.context = cx.state.context.prev;
 299   }
 300   function pushlex(type, info) {
 301     var result = function() {
 302       var state = cx.state, indent = state.indented;
 303       if (state.lexical.type == "stat") indent = state.lexical.indented;
 304       else for (var outer = state.lexical; outer && outer.type == ")" && outer.align; outer = outer.prev)
 305         indent = outer.indented;
 306       state.lexical = new JSLexical(indent, cx.stream.column(), type, null, state.lexical, info);
 307     };
 308     result.lex = true;
 309     return result;
 310   }
 311   function poplex() {
 312     var state = cx.state;
 313     if (state.lexical.prev) {
 314       if (state.lexical.type == ")")
 315         state.indented = state.lexical.indented;
 316       state.lexical = state.lexical.prev;
 317     }
 318   }
 319   poplex.lex = true;
 320
 321   function expect(wanted) {
 322     function exp(type) {
 323       if (type == wanted) return cont();
 324       else if (wanted == ";") return pass();
 325       else return cont(exp);
 326     };
 327     return exp;
 328   }
 329
 330   function statement(type, value) {
 331     if (type == "var") return cont(pushlex("vardef", value.length), vardef, expect(";"), poplex);
 332     if (type == "keyword a") return cont(pushlex("form"), expression, statement, poplex);
 333     if (type == "keyword b") return cont(pushlex("form"), statement, poplex);
 334     if (type == "{") return cont(pushlex("}"), block, poplex);
 335     if (type == ";") return cont();
 336     if (type == "if") {
 337       if (cx.state.lexical.info == "else" && cx.state.cc[cx.state.cc.length - 1] == poplex)
 338         cx.state.cc.pop()();
 339       return cont(pushlex("form"), expression, statement, poplex, maybeelse);
 340     }
 341     if (type == "function") return cont(functiondef);
 342     if (type == "for") return cont(pushlex("form"), forspec, statement, poplex);
 343     if (type == "variable") return cont(pushlex("stat"), maybelabel);
 344     if (type == "switch") return cont(pushlex("form"), expression, pushlex("}", "switch"), expect("{"),
 345                                       block, poplex, poplex);
 346     if (type == "case") return cont(expression, expect(":"));
 347     if (type == "default") return cont(expect(":"));
 348     if (type == "catch") return cont(pushlex("form"), pushcontext, expect("("), funarg, expect(")"),
 349                                      statement, poplex, popcontext);
 350     if (type == "class") return cont(pushlex("form"), className, poplex);
 351     if (type == "export") return cont(pushlex("form"), afterExport, poplex);
 352     if (type == "import") return cont(pushlex("form"), afterImport, poplex);
 353     return pass(pushlex("stat"), expression, expect(";"), poplex);
 354   }
 355   function expression(type) {
 356     return expressionInner(type, false);
 357   }
 358   function expressionNoComma(type) {
 359     return expressionInner(type, true);
 360   }
 361   function expressionInner(type, noComma) {
 362     if (cx.state.fatArrowAt == cx.stream.start) {
 363       var body = noComma ? arrowBodyNoComma : arrowBody;
 364       if (type == "(") return cont(pushcontext, pushlex(")"), commasep(pattern, ")"), poplex, expect("=>"), body, popcontext);
 365       else if (type == "variable") return pass(pushcontext, pattern, expect("=>"), body, popcontext);
 366     }
 367
 368     var maybeop = noComma ? maybeoperatorNoComma : maybeoperatorComma;
 369     if (atomicTypes.hasOwnProperty(type)) return cont(maybeop);
 370     if (type == "function") return cont(functiondef, maybeop);
 371     if (type == "keyword c") return cont(noComma ? maybeexpressionNoComma : maybeexpression);
 372     if (type == "(") return cont(pushlex(")"), maybeexpression, comprehension, expect(")"), poplex, maybeop);
 373     if (type == "operator" || type == "spread") return cont(noComma ? expressionNoComma : expression);
 374     if (type == "[") return cont(pushlex("]"), arrayLiteral, poplex, maybeop);
 375     if (type == "{") return contCommasep(objprop, "}", null, maybeop);
 376     if (type == "quasi") { return pass(quasi, maybeop); }
 377     return cont();
 378   }
 379   function maybeexpression(type) {
 380     if (type.match(/[;\}\)\],]/)) return pass();
 381     return pass(expression);
 382   }
 383   function maybeexpressionNoComma(type) {
 384     if (type.match(/[;\}\)\],]/)) return pass();
 385     return pass(expressionNoComma);
 386   }
 387
 388   function maybeoperatorComma(type, value) {
 389     if (type == ",") return cont(expression);
 390     return maybeoperatorNoComma(type, value, false);
 391   }
 392   function maybeoperatorNoComma(type, value, noComma) {
 393     var me = noComma == false ? maybeoperatorComma : maybeoperatorNoComma;
 394     var expr = noComma == false ? expression : expressionNoComma;
 395     if (type == "=>") return cont(pushcontext, noComma ? arrowBodyNoComma : arrowBody, popcontext);
 396     if (type == "operator") {
 397       if (/\+\+|--/.test(value)) return cont(me);
 398       if (value == "?") return cont(expression, expect(":"), expr);
 399       return cont(expr);
 400     }
 401     if (type == "quasi") { return pass(quasi, me); }
 402     if (type == ";") return;
 403     if (type == "(") return contCommasep(expressionNoComma, ")", "call", me);
 404     if (type == ".") return cont(property, me);
 405     if (type == "[") return cont(pushlex("]"), maybeexpression, expect("]"), poplex, me);
 406   }
 407   function quasi(type, value) {
 408     if (type != "quasi") return pass();
 409     if (value.slice(value.length - 2) != "${") return cont(quasi);
 410     return cont(expression, continueQuasi);
 411   }
 412   function continueQuasi(type) {
 413     if (type == "}") {
 414       cx.marked = "string-2";
 415       cx.state.tokenize = tokenQuasi;
 416       return cont(quasi);
 417     }
 418   }
 419   function arrowBody(type) {
 420     findFatArrow(cx.stream, cx.state);
 421     return pass(type == "{" ? statement : expression);
 422   }
 423   function arrowBodyNoComma(type) {
 424     findFatArrow(cx.stream, cx.state);
 425     return pass(type == "{" ? statement : expressionNoComma);
 426   }
 427   function maybelabel(type) {
 428     if (type == ":") return cont(poplex, statement);
 429     return pass(maybeoperatorComma, expect(";"), poplex);
 430   }
 431   function property(type) {
 432     if (type == "variable") {cx.marked = "property"; return cont();}
 433   }
 434   function objprop(type, value) {
 435     if (type == "variable" || cx.style == "keyword") {
 436       cx.marked = "property";
 437       if (value == "get" || value == "set") return cont(getterSetter);
 438       return cont(afterprop);
 439     } else if (type == "number" || type == "string") {
 440       cx.marked = jsonldMode ? "property" : (cx.style + " property");
 441       return cont(afterprop);
 442     } else if (type == "jsonld-keyword") {
 443       return cont(afterprop);
 444     } else if (type == "[") {
 445       return cont(expression, expect("]"), afterprop);
 446     }
 447   }
 448   function getterSetter(type) {
 449     if (type != "variable") return pass(afterprop);
 450     cx.marked = "property";
 451     return cont(functiondef);
 452   }
 453   function afterprop(type) {
 454     if (type == ":") return cont(expressionNoComma);
 455     if (type == "(") return pass(functiondef);
 456   }
 457   function commasep(what, end) {
 458     function proceed(type) {
 459       if (type == ",") {
 460         var lex = cx.state.lexical;
 461         if (lex.info == "call") lex.pos = (lex.pos || 0) + 1;
 462         return cont(what, proceed);
 463       }
 464       if (type == end) return cont();
 465       return cont(expect(end));
 466     }
 467     return function(type) {
 468       if (type == end) return cont();
 469       return pass(what, proceed);
 470     };
 471   }
 472   function contCommasep(what, end, info) {
 473     for (var i = 3; i < arguments.length; i++)
 474       cx.cc.push(arguments[i]);
 475     return cont(pushlex(end, info), commasep(what, end), poplex);
 476   }
 477   function block(type) {
 478     if (type == "}") return cont();
 479     return pass(statement, block);
 480   }
 481   function maybetype(type) {
 482     if (isTS && type == ":") return cont(typedef);
 483   }
 484   function maybedefault(_, value) {
 485     if (value == "=") return cont(expressionNoComma);
 486   }
 487   function typedef(type) {
 488     if (type == "variable") {cx.marked = "variable-3"; return cont();}
 489   }
 490   function vardef() {
 491     return pass(pattern, maybetype, maybeAssign, vardefCont);
 492   }
 493   function pattern(type, value) {
 494     if (type == "variable") { register(value); return cont(); }
 495     if (type == "[") return contCommasep(pattern, "]");
 496     if (type == "{") return contCommasep(proppattern, "}");
 497   }
 498   function proppattern(type, value) {
 499     if (type == "variable" && !cx.stream.match(/^\s*:/, false)) {
 500       register(value);
 501       return cont(maybeAssign);
 502     }
 503     if (type == "variable") cx.marked = "property";
 504     return cont(expect(":"), pattern, maybeAssign);
 505   }
 506   function maybeAssign(_type, value) {
 507     if (value == "=") return cont(expressionNoComma);
 508   }
 509   function vardefCont(type) {
 510     if (type == ",") return cont(vardef);
 511   }
 512   function maybeelse(type, value) {
 513     if (type == "keyword b" && value == "else") return cont(pushlex("form", "else"), statement, poplex);
 514   }
 515   function forspec(type) {
 516     if (type == "(") return cont(pushlex(")"), forspec1, expect(")"), poplex);
 517   }
 518   function forspec1(type) {
 519     if (type == "var") return cont(vardef, expect(";"), forspec2);
 520     if (type == ";") return cont(forspec2);
 521     if (type == "variable") return cont(formaybeinof);
 522     return pass(expression, expect(";"), forspec2);
 523   }
 524   function formaybeinof(_type, value) {
 525     if (value == "in" || value == "of") { cx.marked = "keyword"; return cont(expression); }
 526     return cont(maybeoperatorComma, forspec2);
 527   }
 528   function forspec2(type, value) {
 529     if (type == ";") return cont(forspec3);
 530     if (value == "in" || value == "of") { cx.marked = "keyword"; return cont(expression); }
 531     return pass(expression, expect(";"), forspec3);
 532   }
 533   function forspec3(type) {
 534     if (type != ")") cont(expression);
 535   }
 536   function functiondef(type, value) {
 537     if (value == "*") {cx.marked = "keyword"; return cont(functiondef);}
 538     if (type == "variable") {register(value); return cont(functiondef);}
 539     if (type == "(") return cont(pushcontext, pushlex(")"), commasep(funarg, ")"), poplex, statement, popcontext);
 540   }
 541   function funarg(type) {
 542     if (type == "spread") return cont(funarg);
 543     return pass(pattern, maybetype, maybedefault);
 544   }
 545   function className(type, value) {
 546     if (type == "variable") {register(value); return cont(classNameAfter);}
 547   }
 548   function classNameAfter(type, value) {
 549     if (value == "extends") return cont(expression, classNameAfter);
 550     if (type == "{") return cont(pushlex("}"), classBody, poplex);
 551   }
 552   function classBody(type, value) {
 553     if (type == "variable" || cx.style == "keyword") {
 554       if (value == "static") {
 555         cx.marked = "keyword";
 556         return cont(classBody);
 557       }
 558       cx.marked = "property";
 559       if (value == "get" || value == "set") return cont(classGetterSetter, functiondef, classBody);
 560       return cont(functiondef, classBody);
 561     }
 562     if (value == "*") {
 563       cx.marked = "keyword";
 564       return cont(classBody);
 565     }
 566     if (type == ";") return cont(classBody);
 567     if (type == "}") return cont();
 568   }
 569   function classGetterSetter(type) {
 570     if (type != "variable") return pass();
 571     cx.marked = "property";
 572     return cont();
 573   }
 574   function afterExport(_type, value) {
 575     if (value == "*") { cx.marked = "keyword"; return cont(maybeFrom, expect(";")); }
 576     if (value == "default") { cx.marked = "keyword"; return cont(expression, expect(";")); }
 577     return pass(statement);
 578   }
 579   function afterImport(type) {
 580     if (type == "string") return cont();
 581     return pass(importSpec, maybeFrom);
 582   }
 583   function importSpec(type, value) {
 584     if (type == "{") return contCommasep(importSpec, "}");
 585     if (type == "variable") register(value);
 586     if (value == "*") cx.marked = "keyword";
 587     return cont(maybeAs);
 588   }
 589   function maybeAs(_type, value) {
 590     if (value == "as") { cx.marked = "keyword"; return cont(importSpec); }
 591   }
 592   function maybeFrom(_type, value) {
 593     if (value == "from") { cx.marked = "keyword"; return cont(expression); }
 594   }
 595   function arrayLiteral(type) {
 596     if (type == "]") return cont();
 597     return pass(expressionNoComma, maybeArrayComprehension);
 598   }
 599   function maybeArrayComprehension(type) {
 600     if (type == "for") return pass(comprehension, expect("]"));
 601     if (type == ",") return cont(commasep(maybeexpressionNoComma, "]"));
 602     return pass(commasep(expressionNoComma, "]"));
 603   }
 604   function comprehension(type) {
 605     if (type == "for") return cont(forspec, comprehension);
 606     if (type == "if") return cont(expression, comprehension);
 607   }
 608
 609   function isContinuedStatement(state, textAfter) {
 610     return state.lastType == "operator" || state.lastType == "," ||
 611       isOperatorChar.test(textAfter.charAt(0)) ||
 612       /[,.]/.test(textAfter.charAt(0));
 613   }
 614
 615   // Interface
 616
 617   return {
 618     startState: function(basecolumn) {
 619       var state = {
 620         tokenize: tokenBase,
 621         lastType: "sof",
 622         cc: [],
 623         lexical: new JSLexical((basecolumn || 0) - indentUnit, 0, "block", false),
 624         localVars: parserConfig.localVars,
 625         context: parserConfig.localVars && {vars: parserConfig.localVars},
 626         indented: 0
 627       };
 628       if (parserConfig.globalVars && typeof parserConfig.globalVars == "object")
 629         state.globalVars = parserConfig.globalVars;
 630       return state;
 631     },
 632
 633     token: function(stream, state) {
 634       if (stream.sol()) {
 635         if (!state.lexical.hasOwnProperty("align"))
 636           state.lexical.align = false;
 637         state.indented = stream.indentation();
 638         findFatArrow(stream, state);
 639       }
 640       if (state.tokenize != tokenComment && stream.eatSpace()) return null;
 641       var style = state.tokenize(stream, state);
 642       if (type == "comment") return style;
 643       state.lastType = type == "operator" && (content == "++" || content == "--") ? "incdec" : type;
 644       return parseJS(state, style, type, content, stream);
 645     },
 646
 647     indent: function(state, textAfter) {
 648       if (state.tokenize == tokenComment) return CodeMirror.Pass;
 649       if (state.tokenize != tokenBase) return 0;
 650       var firstChar = textAfter && textAfter.charAt(0), lexical = state.lexical;
 651       // Kludge to prevent 'maybelse' from blocking lexical scope pops
 652       if (!/^\s*else\b/.test(textAfter)) for (var i = state.cc.length - 1; i >= 0; --i) {
 653         var c = state.cc[i];
 654         if (c == poplex) lexical = lexical.prev;
 655         else if (c != maybeelse) break;
 656       }
 657       if (lexical.type == "stat" && firstChar == "}") lexical = lexical.prev;
 658       if (statementIndent && lexical.type == ")" && lexical.prev.type == "stat")
 659         lexical = lexical.prev;
 660       var type = lexical.type, closing = firstChar == type;
 661
 662       if (type == "vardef") return lexical.indented + (state.lastType == "operator" || state.lastType == "," ? lexical.info + 1 : 0);
 663       else if (type == "form" && firstChar == "{") return lexical.indented;
 664       else if (type == "form") return lexical.indented + indentUnit;
 665       else if (type == "stat")
 666         return lexical.indented + (isContinuedStatement(state, textAfter) ? statementIndent || indentUnit : 0);
 667       else if (lexical.info == "switch" && !closing && parserConfig.doubleIndentSwitch != false)
 668         return lexical.indented + (/^(?:case|default)\b/.test(textAfter) ? indentUnit : 2 * indentUnit);
 669       else if (lexical.align) return lexical.column + (closing ? 0 : 1);
 670       else return lexical.indented + (closing ? 0 : indentUnit);
 671     },
 672
 673     electricInput: /^\s*(?:case .*?:|default:|\{|\})$/,
 674     blockCommentStart: jsonMode ? null : "/*",
 675     blockCommentEnd: jsonMode ? null : "*/",
 676     lineComment: jsonMode ? null : "//",
 677     fold: "brace",
 678     closeBrackets: "()[]{}''\"\"``",
 679
 680     helperType: jsonMode ? "json" : "javascript",
 681     jsonldMode: jsonldMode,
 682     jsonMode: jsonMode
 683   };
 684 });
 685
 686 CodeMirror.registerHelper("wordChars", "javascript", /[\w$]/);
 687
 688 CodeMirror.defineMIME("text/javascript", "javascript");
 689 CodeMirror.defineMIME("text/ecmascript", "javascript");
 690 CodeMirror.defineMIME("application/javascript", "javascript");
 691 CodeMirror.defineMIME("application/x-javascript", "javascript");
 692 CodeMirror.defineMIME("application/ecmascript", "javascript");
 693 CodeMirror.defineMIME("application/json", {name: "javascript", json: true});
 694 CodeMirror.defineMIME("application/x-json", {name: "javascript", json: true});
 695 CodeMirror.defineMIME("application/ld+json", {name: "javascript", jsonld: true});
 696 CodeMirror.defineMIME("text/typescript", { name: "javascript", typescript: true });
 697 CodeMirror.defineMIME("application/typescript", { name: "javascript", typescript: true });
 698
 699 });