git.roojs.org Git - gnome.introspection-doc-generator/blob - JSDOC/ScopeParser.js

   1 //<Script type="text/javascript">
   2
   3 Scope = imports['JSDOC/Scope.js'].Scope;
   4
   5 /**
   6 * Scope stuff
   7 *
   8 * // FIXME - I need this to do next() without doccomments..
   9 */
  10
  11 ScopeParser = function(ts) {
  12     this.ts = ts; // {TokenStream}
  13     this.warnings = [];
  14     this.scopes = [];
  15     this.indexedScopes = {};
  16     this.timer = new Date() * 1;
  17
  18 }
  19
  20 // list of keywords that should not be used in object literals.
  21 ScopeParser.idents = [
  22         "break",
  23         "case",
  24         "continue",
  25         "default",
  26         "delete",
  27         "do",
  28         "else",
  29         "export",
  30         "false",
  31         "for",
  32         "function",
  33         "if",
  34         "import",
  35         "in",
  36         "new",
  37         "null",
  38         "return",
  39         "switch",
  40         "this",
  41         "true",
  42         "typeof",
  43         "var",
  44         "void",
  45         "while",
  46         "with",
  47
  48         "catch",
  49         "class",
  50         "const",
  51         "debugger",
  52         "enum",
  53         "extends",
  54         "finally",
  55         "super",
  56         "throw",
  57         "try",
  58
  59         "abstract",
  60         "boolean",
  61         "byte",
  62         "char",
  63         "double",
  64         "final",
  65         "float",
  66         "goto",
  67         "implements",
  68         "instanceof",
  69         "int",
  70         "interface",
  71         "long",
  72         "native",
  73         "package",
  74         "private",
  75         "protected",
  76         "public",
  77         "short",
  78         "static",
  79         "synchronized",
  80         "throws",
  81         "transient",
  82                 "include",
  83                 "undefined"
  84 ];
  85
  86
  87 ScopeParser.prototype = {
  88     timer: 0,
  89     timerPrint: function (str) {
  90         var ntime = new Date() * 1;
  91         var tdif =  ntime -this.timer;
  92         this.timer = ntime;
  93         var pref = '';
  94         if (tdif > 100) { //slower ones..
  95             pref = '***';
  96         }
  97         println(pref+'['+tdif+']'+str);
  98
  99     },
 100     warn: function(s) {
 101         this.warnings.push(s);
 102         //println("WARNING:" + htmlescape(s) + "<BR>");
 103     },
 104     // defaults should not be initialized here =- otherwise they get duped on new, rather than initalized..
 105     warnings : false,
 106     ts : false,
 107     scopes : false,
 108     global : false,
 109     mode : "", //"BUILDING_SYMBOL_TREE",
 110     braceNesting : 0,
 111     indexedScopes : false,
 112     munge: true,
 113
 114
 115
 116
 117
 118     buildSymbolTree : function()
 119     {
 120         //println("<PRE>");
 121
 122         this.ts.rewind();
 123         this.braceNesting = 0;
 124         this.scopes = [];
 125
 126
 127
 128
 129         this.globalScope = new  Scope(-1, false, -1, '');
 130         indexedScopes = { 0 : this.globalScope };
 131
 132         this.mode = 'BUILDING_SYMBOL_TREE';
 133         this.parseScope(this.globalScope);
 134     },
 135     mungeSymboltree : function()
 136     {
 137
 138         if (!this.munge) {
 139             return;
 140         }
 141
 142         // One problem with obfuscation resides in the use of undeclared
 143         // and un-namespaced global symbols that are 3 characters or less
 144         // in length. Here is an example:
 145         //
 146         //     var declaredGlobalVar;
 147         //
 148         //     function declaredGlobalFn() {
 149         //         var localvar;
 150         //         localvar = abc; // abc is an undeclared global symbol
 151         //     }
 152         //
 153         // In the example above, there is a slim chance that localvar may be
 154         // munged to 'abc', conflicting with the undeclared global symbol
 155         // abc, creating a potential bug. The following code detects such
 156         // global symbols. This must be done AFTER the entire file has been
 157         // parsed, and BEFORE munging the symbol tree. Note that declaring
 158         // extra symbols in the global scope won't hurt.
 159         //
 160         // Note: Since we go through all the tokens to do this, we also use
 161         // the opportunity to count how many times each identifier is used.
 162
 163         this.ts.rewind();
 164         this.braceNesting = 0;
 165         this.scopes= [];
 166         this.mode = 'CHECKING_SYMBOL_TREE';
 167
 168         //println("MUNGING?");
 169
 170         this.parseScope(this.globalScope);
 171         this.globalScope.munge();
 172     },
 173
 174
 175     log : function(str)
 176     {
 177           //println("<B>LOG:</B>" + htmlescape(str) + "<BR/>\n");
 178     },
 179     logR : function(str)
 180     {
 181             //println("<B>LOG:</B>" + str + "<BR/>");
 182     },
 183
 184
 185
 186
 187
 188
 189     parseScope : function(scope) // parse a token stream..
 190     {
 191         //this.timerPrint("parseScope EnterScope");
 192         var symbol;
 193         var token;
 194
 195         var identifier;
 196
 197         var expressionBraceNesting = this.braceNesting;
 198         var bracketNesting = 0;
 199         var parensNesting = 0;
 200
 201         var isObjectLitAr = [ false ];
 202
 203         this.scopes.push(scope);
 204         token = this.ts.lookTok(1);
 205         while (token) {
 206           //  this.timerPrint("parseScope AFTER lookT: " + token.toString());
 207
 208             print(token.type + '.' + token.name+ ":" + token.data);
 209             switch(token.type + '.' + token.name) {
 210                 case "KEYW.VAR":
 211                 case "KEYW.CONST": // not really relivant as it's only mozzy that does this.
 212
 213                     //this.log("parseScope GOT VAR/CONST : " + token.toString());
 214                     while (true) {
 215                         token = this.ts.nextTok();
 216
 217
 218                         if (!token) { // can return false at EOF!
 219                             break;
 220                         }
 221                         if (token.name == "VAR") { // kludge..
 222                             continue;
 223                         }
 224                         //this.logR("parseScope GOT VAR  : <B>" + token.toString() + "</B>");
 225                         if (token.type !="NAME") {
 226                             print(token.toString());
 227                             print( "var without ident");
 228                             Seed.quit
 229                         }
 230
 231
 232                         if (this.mode == "BUILDING_SYMBOL_TREE") {
 233                             identifier = scope.getIdentifier(token.data) ;
 234
 235                             if (identifier == false) {
 236                                 scope.declareIdentifier(token.data, token);
 237                             } else {
 238                                 token.identifier = identifier;
 239                                 this.warn("The variable " + token.data  + ' (line:' + token.line + ")  has already been declared in the same scope...");
 240                             }
 241                         }
 242
 243                         token = this.ts.nextTok();
 244                         /*
 245                         assert token.getType() == Token.SEMI ||
 246                                 token.getType() == Token.ASSIGN ||
 247                                 token.getType() == Token.COMMA ||
 248                                 token.getType() == Token.IN;
 249                         */
 250                         if (token.name == "IN") {
 251                             break;
 252                         } else {
 253                             this.parseExpression();
 254                             //this.logR("parseScope DONE  : <B>ParseExpression</B> - tok is:" + this.ts.lookT(0).toString());
 255
 256
 257                             if (this.ts.lookTok(0).data == ';') {
 258                                 break;
 259                             }
 260                         }
 261                     }
 262                     break;
 263                 case "KEYW.FUNCTION":
 264                     //println("<i>"+token.data+"</i>");
 265                     this.parseFunctionDeclaration();
 266                     break;
 267
 268                 case "KEYW.LEFT_CURLY": // {
 269                     //println("<i>"+token.data+"</i>");
 270                     isObjectLitAr.push(false);
 271                     this.braceNesting++;
 272                     break;
 273
 274                 case "KEYW.RIGHT_CURLY": // }
 275                     //println("<i>"+token.data+"</i>");
 276                     this.braceNesting--;
 277                     isObjectLitAr.pop();
 278                         //assert braceNesting >= scope.getBraceNesting();
 279                     if (this.braceNesting == scope.braceN) {
 280                         var ls = this.scopes.pop();
 281                         ls.getUsedSymbols();
 282                         return;
 283                     }
 284                     break;
 285
 286                 case "KEYW.WITH":
 287                     //println("<i>"+token.data+"</i>");
 288                     if (this.mode == "BUILDING_SYMBOL_TREE") {
 289                         // Inside a 'with' block, it is impossible to figure out
 290                         // statically whether a symbol is a local variable or an
 291                         // object member. As a consequence, the only thing we can
 292                         // do is turn the obfuscation off for the highest scope
 293                         // containing the 'with' block.
 294                         this.protectScopeFromObfuscation(scope);
 295                         this.warn("Using 'with' is not recommended." + (this.munge ? " Moreover, using 'with' reduces the level of compression!" : ""), true);
 296                     }
 297                     break;
 298
 299                 case "KEYW.CATCH":
 300                     //println("<i>"+token.data+"</i>");
 301                     this.parseCatch();
 302                     break;
 303                 /*
 304                 case Token.SPECIALCOMMENT:
 305                         if (mode == BUILDING_SYMBOL_TREE) {
 306                             protectScopeFromObfuscation(scope);
 307                             this.warn("Using JScript conditional comments is not recommended." + (munge ? " Moreover, using JScript conditional comments reduces the level of compression." : ""), true);
 308                         }
 309                         break;
 310                 */
 311
 312                 case "STRN.DOUBLE_QUOTE": // used for object lit detection..
 313                 case "STRN.SINGLE_QUOTE":
 314                     //println("<i>"+token.data+"</i>");
 315                     if (this.ts.lookTok(-1).data == '{' && this.ts.lookTok(1).data == ':') {
 316                         // then we are in an object lit.. -> we need to flag the brace as such...
 317                         isObjectLitAr.pop();
 318                         isObjectLitAr.push(true);
 319                     }
 320                     var isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 321
 322                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ':' &&
 323                         ( this.ts.lookTok(-1).data == '{'  ||  this.ts.lookTok(-1).data == ':' )) {
 324                         // see if we can replace..
 325                         // remove the quotes..
 326                         // should do a bit more checking!!!! (what about wierd char's in the string..
 327                         var str = token.data.substring(1,token.data.length-1);
 328                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 329                             token.outData = str;
 330                         }
 331
 332
 333
 334                     }
 335
 336
 337
 338                     break;
 339
 340                 case "NAME.NAME":
 341
 342                     //print("DEAL WITH NAME:");
 343                     // got identifier..
 344
 345                     // look for  { ** : <- indicates obj literal.. ** this could occur with numbers ..
 346                     if ((this.ts.lookTok(-1).data == "{") && (this.ts.lookTok(1).data == ":")) {
 347                         isObjectLitAr.pop();
 348                         isObjectLitAr.push(true);
 349                         //println("<i>"+token.data+"</i>");
 350                         break;
 351                     }
 352                    // print("DEAL WITH obj lit:");
 353                     var isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 354
 355                     if (isInObjectLitAr && (this.ts.lookTok(1).data == ":") && (this.ts.lookTok(-1).data == ",")) {
 356                         // skip, it's an object lit key..
 357                         //println("<i>"+token.data+"</i>");
 358                         break;
 359                     }
 360
 361
 362                     // skip anyting with "." before it..!!
 363
 364                     if (this.ts.lookTok(-1).data == ".") {
 365                         // skip, it's an object prop.
 366                         //println("<i>"+token.data+"</i>");
 367                         break;
 368                     }
 369                     symbol = token.data;
 370                      if (this.mode == 'CHECKING_SYMBOL_TREE') {
 371
 372                         //println("GOT IDENT: -2 : " + this.ts.lookT(-2).toString() + " <BR> ..... -1 :  " +  this.ts.lookT(-1).toString() + " <BR> ");
 373
 374
 375
 376                         //println("GOT IDENT: <B>" + symbol + "</B><BR/>");
 377
 378                             //println("GOT IDENT (2): <B>" + symbol + "</B><BR/>");
 379                         identifier = this.getIdentifier(symbol, scope);
 380
 381                         if (identifier == false) {
 382 // BUG!find out where builtin is defined...
 383                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 384                                 // Here, we found an undeclared and un-namespaced symbol that is
 385                                 // 3 characters or less in length. Declare it in the global scope.
 386                                 // We don't need to declare longer symbols since they won't cause
 387                                 // any conflict with other munged symbols.
 388                                 this.globalScope.declareIdentifier(symbol, token);
 389                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 390                             }
 391
 392                             //println("GOT IDENT IGNORE(3): <B>" + symbol + "</B><BR/>");
 393                         } else {
 394                             token.identifier = identifier;
 395                             identifier.refcount++;
 396                         }
 397                     }
 398
 399                     break;
 400                     //println("<B>SID</B>");
 401                 default:
 402                     if (token.type != 'KEYW') {
 403                         break;
 404                     }
 405                    // print("Check eval:");
 406
 407                     symbol = token.data;
 408
 409                      if (this.mode == 'BUILDING_SYMBOL_TREE') {
 410
 411                         if (symbol == "eval") {
 412                             // look back one and see if we can find a comment!!!
 413                             if (this.ts.look(-1).type == "COMM") {
 414                                 // look for eval:var:noreplace\n
 415                                 var _t = this;
 416                                 this.ts.look(-1).data.replace(/eval:var:([a-z_]+)/ig, function(m, a) {
 417
 418                                     var hi = _t.getIdentifier(a, scope);
 419                                    // println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 420                                     if (hi) {
 421                                      //   println("PROTECT "+a+" from munge");
 422                                         hi.toMunge = false;
 423                                     }
 424
 425                                 });
 426
 427
 428                             } else {
 429
 430
 431                                 this.protectScopeFromObfuscation(scope);
 432                                 this.warn("Using 'eval' is not recommended. (use  eval:var:noreplace in comments to optimize) " + (this.munge ? " Moreover, using 'eval' reduces the level of compression!" : ""), true);
 433                             }
 434
 435                         }
 436
 437                     }
 438                     break;
 439
 440
 441             } // end switch
 442
 443
 444             //this.timerPrint("parseScope TOK : " + token.toString());
 445             token = this.ts.nextTok();
 446             //if (this.ts.nextT()) break;
 447
 448         }
 449     },
 450
 451
 452     parseExpression : function() {
 453
 454         // Parse the expression until we encounter a comma or a semi-colon
 455         // in the same brace nesting, bracket nesting and paren nesting.
 456         // Parse functions if any...
 457         //println("<i>EXP</i><BR/>");
 458         var symbol;
 459         var token;
 460         var currentScope;
 461         var identifier;
 462
 463         var expressionBraceNesting = this.braceNesting;
 464         var bracketNesting = 0;
 465         var parensNesting = 0;
 466
 467         var isObjectLitAr = [ false ];
 468         while (token = this.ts.lookTok()) {
 469
 470
 471
 472             currentScope = this.scopes[this.scopes.length-1];
 473
 474             //println("<i>"+token.data+"</i>");
 475
 476             switch (token.data.toUpperCase()) {
 477
 478                 case ';':
 479                 case ',':
 480                     if (this.braceNesting == expressionBraceNesting &&
 481                             bracketNesting == 0 &&
 482                             parensNesting == 0) {
 483                         return;
 484                     }
 485                     break;
 486
 487                 case 'FUNCTION':
 488                     this.parseFunctionDeclaration();
 489                     break;
 490
 491                 case '{': //Token.LC:
 492                     isObjectLitAr.push(false);
 493
 494                     this.braceNesting++;
 495                     break;
 496
 497                 case '}': //Token.RC:
 498                     this.braceNesting--;
 499                     isObjectLitAr.pop();
 500
 501                    // assert braceNesting >= expressionBraceNesting;
 502                     break;
 503
 504                 case '[': //Token.LB:
 505                     bracketNesting++;
 506                     break;
 507
 508                 case ']': //Token.RB:
 509                     bracketNesting--;
 510                     break;
 511
 512                 case '(': //Token.LP:
 513                     parensNesting++;
 514                     break;
 515
 516                 case ')': //Token.RP:
 517                     parensNesting--;
 518                     break;
 519             }
 520             switch(token.type) {
 521
 522                 case 'STRN': // used for object lit detection..
 523                     if (this.ts.lookTok(-1).data == "{" && this.ts.lookTok(1).data == ":" ) {
 524                         // then we are in an object lit.. -> we need to flag the brace as such...
 525                         isObjectLitAr.pop();
 526                         isObjectLitAr.push(true);
 527                     }
 528
 529
 530
 531                     var isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 532                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ":"  &&
 533                         ( this.ts.lookTok(-1).data == "{"  ||  this.ts.lookTok(-1).data == "," )) {
 534                         // see if we can replace..
 535                         // remove the quotes..
 536                         var str = token.data.substring(1,token.data.length-1);
 537                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 538                             token.outData = str;
 539                         }
 540
 541
 542
 543                     }
 544
 545                     break;
 546
 547
 548
 549                 /*
 550                 case Token.SPECIALCOMMENT:
 551                     if (mode == BUILDING_SYMBOL_TREE) {
 552                         protectScopeFromObfuscation(currentScope);
 553                         this.warn("Using JScript conditional comments is not recommended." + (munge ? " Moreover, using JScript conditional comments reduces the level of compression!" : ""), true);
 554                     }
 555                     break;
 556                 */
 557                 case 'NAME':
 558
 559                     symbol = token.data;
 560                     if (this.ts.lookTok(-1).data == "{"  && this.ts.lookTok(1).data == ":") {
 561                         // then we are in an object lit.. -> we need to flag the brace as such...
 562                         isObjectLitAr.pop();
 563                         isObjectLitAr.push(true);
 564                         break;
 565                     }
 566                     var isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 567                     if (isInObjectLitAr && this.ts.lookTok(-1).data == "," && this.ts.lookTok(1).data == ":") {
 568                         break;
 569                     }
 570
 571                     if (this.ts.lookTok(-1).data == ".") {
 572                         //skip '.'
 573                         break;
 574                     }
 575
 576                      if (this.mode == 'CHECKING_SYMBOL_TREE') {
 577
 578                         identifier = this.getIdentifier(symbol, currentScope);
 579                         //println("<B>??</B>");
 580                         if (identifier == false) {
 581
 582                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 583                                 // Here, we found an undeclared and un-namespaced symbol that is
 584                                 // 3 characters or less in length. Declare it in the global scope.
 585                                 // We don't need to declare longer symbols since they won't cause
 586                                 // any conflict with other munged symbols.
 587                                 this.globalScope.declareIdentifier(symbol, token);
 588                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 589                             } else {
 590                                 //println("undeclared")
 591                             }
 592
 593
 594                         } else {
 595                             //println("<B>++</B>");
 596                             token.identifier = identifier;
 597                             identifier.refcount++;
 598                         }
 599
 600                     }
 601                     break;
 602
 603
 604
 605
 606                     //println("<B>EID</B>");
 607                  case 'KEYW':
 608                     symbol = token.data;
 609                     if (this.mode == 'BUILDING_SYMBOL_TREE') {
 610
 611                         if (symbol == "eval") {
 612                             if (this.ts.look(-1).type == 'COMM') {
 613                                 // look for eval:var:noreplace\n
 614                                 var _t = this;
 615                                 this.ts.look(-1).data.replace(/eval:var:([a-z]+)/ig, function(m, a) {
 616                                     var hi = _t.getIdentifier(a, currentScope);
 617                                    //println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 618                                     if (hi) {
 619                                       //  println("PROTECT "+a+" from munge");
 620                                         hi.toMunge = false;
 621                                     }
 622
 623
 624                                 });
 625
 626                             } else {
 627                                 this.protectScopeFromObfuscation(currentScope);
 628                                 this.warn("Using 'eval' is not recommended." + (this.munge ? " Moreover, using 'eval' reduces the level of compression!" : ""), true);
 629                             }
 630
 631
 632                         }
 633                         break;
 634                     }
 635
 636             }
 637             if (!this.ts.nextTok()) break;
 638         }
 639     },
 640
 641
 642     parseCatch : function() {
 643
 644         var symbol;
 645         var token;
 646         var currentScope;
 647         var identifier;
 648
 649         //token = getToken(-1);
 650         //assert token.getType() == Token.CATCH;
 651         token = this.ts.nextTok();
 652         //assert token.getType() == Token.LP; (
 653         token = this.ts.nextTok();
 654         //assert token.getType() == Token.NAME;
 655
 656         symbol = token.data;
 657         currentScope = this.scopes[this.scopes.length-1];
 658
 659         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 660             // We must declare the exception identifier in the containing function
 661             // scope to avoid errors related to the obfuscation process. No need to
 662             // display a warning if the symbol was already declared here...
 663             currentScope.declareIdentifier(symbol, token);
 664         } else {
 665             //?? why inc the refcount?? - that should be set when building the tree???
 666             identifier = this.getIdentifier(symbol, currentScope);
 667             identifier.refcount++;
 668         }
 669
 670         token = this.ts.nextTok();
 671         //assert token.getType() == Token.RP; // )
 672     },
 673
 674     parseFunctionDeclaration : function()
 675     {
 676
 677         var symbol;
 678         var token;
 679         var currentScope  = false;
 680         var fnScope = false;
 681         var identifier;
 682         //this.logR("<B>PARSING FUNCTION</B>");
 683         currentScope = this.scopes[this.scopes.length-1];
 684
 685         token = this.ts.nextTok();
 686         if (token.type == "NAME") {
 687             if (this.mode == 'BUILDING_SYMBOL_TREE') {
 688                 // Get the name of the function and declare it in the current scope.
 689                 symbol = token.data;
 690                 if (currentScope.getIdentifier(symbol) != false) {
 691                     this.warn("The function " + symbol + " has already been declared in the same scope...", true);
 692                 }
 693                 currentScope.declareIdentifier(symbol,token);
 694             }
 695             token =  this.ts.nextTok();
 696         }
 697
 698         //assert token.getType() == Token.LP;
 699         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 700             fnScope = new Scope(this.braceNesting, currentScope, token.n, '');
 701
 702             //println("STORING SCOPE" + this.ts.cursor);
 703
 704             this.indexedScopes[this.ts.cursor] = fnScope;
 705
 706         } else {
 707             //println("FETCHING SCOPE" + this.ts.cursor);
 708             fnScope = this.indexedScopes[this.ts.cursor];
 709         }
 710
 711         // Parse function arguments.
 712         var argpos = 0;
 713         while (!this.ts.lookTok().data == ')') { //(token = consumeToken()).getType() != Token.RP) {
 714             token = this.ts.nextTok();
 715
 716             //assert token.getType() == Token.NAME ||
 717             //        token.getType() == Token.COMMA;
 718             if (token.type == 'NAME' && this.mode == 'BUILDING_SYMBOL_TREE') {
 719                 symbol = token.data;
 720                 identifier = fnScope.declareIdentifier(symbol,token);
 721                 if (symbol == "$super" && argpos == 0) {
 722                     // Exception for Prototype 1.6...
 723                     identifier.preventMunging();
 724                 }
 725                 argpos++;
 726             }
 727         }
 728
 729         token = this.ts.nextTok();
 730         // assert token.getType() == Token.LC;
 731         this.braceNesting++;
 732
 733         token = this.ts.nextTok();
 734         if (token.type == "STRN" && this.ts.lookTok(1).data == ';') {
 735             /*
 736
 737             NOT SUPPORTED YET!?!!?!
 738
 739             // This is a hint. Hints are empty statements that look like
 740             // "localvar1:nomunge, localvar2:nomunge"; They allow developers
 741             // to prevent specific symbols from getting obfuscated (some heretic
 742             // implementations, such as Prototype 1.6, require specific variable
 743             // names, such as $super for example, in order to work appropriately.
 744             // Note: right now, only "nomunge" is supported in the right hand side
 745             // of a hint. However, in the future, the right hand side may contain
 746             // other values.
 747             consumeToken();
 748             String hints = token.getValue();
 749             // Remove the leading and trailing quotes...
 750             hints = hints.substring(1, hints.length() - 1).trim();
 751             StringTokenizer st1 = new StringTokenizer(hints, ",");
 752             while (st1.hasMoreTokens()) {
 753                 String hint = st1.nextToken();
 754                 int idx = hint.indexOf(':');
 755                 if (idx <= 0 || idx >= hint.length() - 1) {
 756                     if (mode == BUILDING_SYMBOL_TREE) {
 757                         // No need to report the error twice, hence the test...
 758                         this.warn("Invalid hint syntax: " + hint, true);
 759                     }
 760                     break;
 761                 }
 762                 String variableName = hint.substring(0, idx).trim();
 763                 String variableType = hint.substring(idx + 1).trim();
 764                 if (mode == BUILDING_SYMBOL_TREE) {
 765                     fnScope.addHint(variableName, variableType);
 766                 } else if (mode == CHECKING_SYMBOL_TREE) {
 767                     identifier = fnScope.getIdentifier(variableName);
 768                     if (identifier != null) {
 769                         if (variableType.equals("nomunge")) {
 770                             identifier.preventMunging();
 771                         } else {
 772                             this.warn("Unsupported hint value: " + hint, true);
 773                         }
 774                     } else {
 775                         this.warn("Hint refers to an unknown identifier: " + hint, true);
 776                     }
 777                 }
 778             }
 779             */
 780         }
 781
 782         this.parseScope(fnScope);
 783         // now pop it off the stack!!!
 784
 785
 786
 787     },
 788
 789     protectScopeFromObfuscation : function(scope) {
 790             //assert scope != null;
 791
 792         if (scope == this.globalScope) {
 793             // The global scope does not get obfuscated,
 794             // so we don't need to worry about it...
 795             return;
 796         }
 797
 798         // Find the highest local scope containing the specified scope.
 799         while (scope && scope.parent != this.globalScope) {
 800             scope = scope.parent;
 801         }
 802
 803         //assert scope.getParentScope() == globalScope;
 804         scope.preventMunging();
 805     },
 806
 807     getIdentifier: function(symbol, scope) {
 808         var identifier;
 809         while (scope != false) {
 810             identifier = scope.getIdentifier(symbol);
 811             //println("ScopeParser.getIdentgetUsedSymbols("+symbol+")=" + scope.getUsedSymbols().join(','));
 812             if (identifier) {
 813                 return identifier;
 814             }
 815             scope = scope.parent;
 816         }
 817         return false;
 818     }
 819 };