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     this.debug = false;
  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 = 'MUNGING_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             !this.debug|| 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                         !this.debug|| print( token.toString());
 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                         !this.debug|| print(token.toString());
 245                         /*
 246                         assert token.getType() == Token.SEMI ||
 247                                 token.getType() == Token.ASSIGN ||
 248                                 token.getType() == Token.COMMA ||
 249                                 token.getType() == Token.IN;
 250                         */
 251                         if (token.name == "IN") {
 252                             break;
 253                         } else {
 254                             this.parseExpression();
 255                             //this.logR("parseScope DONE  : <B>ParseExpression</B> - tok is:" + this.ts.lookT(0).toString());
 256
 257                             token = this.ts.lookTok(1);
 258                             !this.debug|| print("AFTER EXP: " + token.toString());
 259                             if (token.data == ';') {
 260                                 break;
 261                             }
 262                         }
 263                     }
 264                     break;
 265                 case "KEYW.FUNCTION":
 266                     //println("<i>"+token.data+"</i>");
 267                     this.parseFunctionDeclaration();
 268                     break;
 269
 270                 case "KEYW.LEFT_CURLY": // {
 271                     //println("<i>"+token.data+"</i>");
 272                     isObjectLitAr.push(false);
 273                     this.braceNesting++;
 274                     break;
 275
 276                 case "KEYW.RIGHT_CURLY": // }
 277                     //println("<i>"+token.data+"</i>");
 278                     this.braceNesting--;
 279                     isObjectLitAr.pop();
 280                         //assert braceNesting >= scope.getBraceNesting();
 281                     if (this.braceNesting == scope.braceN) {
 282                         var ls = this.scopes.pop();
 283                         ls.getUsedSymbols();
 284                         return;
 285                     }
 286                     break;
 287
 288                 case "KEYW.WITH":
 289                     //println("<i>"+token.data+"</i>");
 290                     if (this.mode == "BUILDING_SYMBOL_TREE") {
 291                         // Inside a 'with' block, it is impossible to figure out
 292                         // statically whether a symbol is a local variable or an
 293                         // object member. As a consequence, the only thing we can
 294                         // do is turn the obfuscation off for the highest scope
 295                         // containing the 'with' block.
 296                         this.protectScopeFromObfuscation(scope);
 297                         this.warn("Using 'with' is not recommended." + (this.munge ? " Moreover, using 'with' reduces the level of compression!" : ""), true);
 298                     }
 299                     break;
 300
 301                 case "KEYW.CATCH":
 302                     //println("<i>"+token.data+"</i>");
 303                     this.parseCatch();
 304                     break;
 305                 /*
 306                 case Token.SPECIALCOMMENT:
 307                         if (mode == BUILDING_SYMBOL_TREE) {
 308                             protectScopeFromObfuscation(scope);
 309                             this.warn("Using JScript conditional comments is not recommended." + (munge ? " Moreover, using JScript conditional comments reduces the level of compression." : ""), true);
 310                         }
 311                         break;
 312                 */
 313
 314                 case "STRN.DOUBLE_QUOTE": // used for object lit detection..
 315                 case "STRN.SINGLE_QUOTE":
 316                     //println("<i>"+token.data+"</i>");
 317                     if (this.ts.lookTok(-1).data == '{' && this.ts.lookTok(1).data == ':') {
 318                         // then we are in an object lit.. -> we need to flag the brace as such...
 319                         isObjectLitAr.pop();
 320                         isObjectLitAr.push(true);
 321                     }
 322                     var isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 323
 324                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ':' &&
 325                         ( this.ts.lookTok(-1).data == '{'  ||  this.ts.lookTok(-1).data == ':' )) {
 326                         // see if we can replace..
 327                         // remove the quotes..
 328                         // should do a bit more checking!!!! (what about wierd char's in the string..
 329                         var str = token.data.substring(1,token.data.length-1);
 330                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 331                             token.outData = str;
 332                         }
 333
 334
 335
 336                     }
 337
 338
 339
 340                     break;
 341
 342                 case "NAME.NAME":
 343
 344                     //print("DEAL WITH NAME:");
 345                     // got identifier..
 346
 347                     // look for  { ** : <- indicates obj literal.. ** this could occur with numbers ..
 348                     if ((this.ts.lookTok(-1).data == "{") && (this.ts.lookTok(1).data == ":")) {
 349                         isObjectLitAr.pop();
 350                         isObjectLitAr.push(true);
 351                         //println("<i>"+token.data+"</i>");
 352                         break;
 353                     }
 354                    // print("DEAL WITH obj lit:");
 355                     var isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 356
 357                     if (isInObjectLitAr && (this.ts.lookTok(1).data == ":") && (this.ts.lookTok(-1).data == ",")) {
 358                         // skip, it's an object lit key..
 359                         //println("<i>"+token.data+"</i>");
 360                         break;
 361                     }
 362
 363
 364                     // skip anyting with "." before it..!!
 365
 366                     if (this.ts.lookTok(-1).data == ".") {
 367                         // skip, it's an object prop.
 368                         //println("<i>"+token.data+"</i>");
 369                         break;
 370                     }
 371                     symbol = token.data;
 372                     if (this.mode == 'MUNGING_SYMBOL_TREE') {
 373
 374                         //println("GOT IDENT: -2 : " + this.ts.lookT(-2).toString() + " <BR> ..... -1 :  " +  this.ts.lookT(-1).toString() + " <BR> ");
 375
 376                         print ("MUNGE?" + symbol);
 377
 378                         //println("GOT IDENT: <B>" + symbol + "</B><BR/>");
 379
 380                             //println("GOT IDENT (2): <B>" + symbol + "</B><BR/>");
 381                         identifier = this.getIdentifier(symbol, scope);
 382
 383                         if (identifier == false) {
 384 // BUG!find out where builtin is defined...
 385                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 386                                 // Here, we found an undeclared and un-namespaced symbol that is
 387                                 // 3 characters or less in length. Declare it in the global scope.
 388                                 // We don't need to declare longer symbols since they won't cause
 389                                 // any conflict with other munged symbols.
 390                                 this.globalScope.declareIdentifier(symbol, token);
 391                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 392                             }
 393
 394                             //println("GOT IDENT IGNORE(3): <B>" + symbol + "</B><BR/>");
 395                         } else {
 396                             token.identifier = identifier;
 397                             identifier.refcount++;
 398                         }
 399                     }
 400
 401                     break;
 402                     //println("<B>SID</B>");
 403                 default:
 404                     if (token.type != 'KEYW') {
 405                         break;
 406                     }
 407                    // print("Check eval:");
 408
 409                     symbol = token.data;
 410
 411                      if (this.mode == 'BUILDING_SYMBOL_TREE') {
 412
 413                         if (symbol == "eval") {
 414                             // look back one and see if we can find a comment!!!
 415                             if (this.ts.look(-1).type == "COMM") {
 416                                 // look for eval:var:noreplace\n
 417                                 var _t = this;
 418                                 this.ts.look(-1).data.replace(/eval:var:([a-z_]+)/ig, function(m, a) {
 419
 420                                     var hi = _t.getIdentifier(a, scope);
 421                                    // println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 422                                     if (hi) {
 423                                      //   println("PROTECT "+a+" from munge");
 424                                         hi.toMunge = false;
 425                                     }
 426
 427                                 });
 428
 429
 430                             } else {
 431
 432
 433                                 this.protectScopeFromObfuscation(scope);
 434                                 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);
 435                             }
 436
 437                         }
 438
 439                     }
 440                     break;
 441
 442
 443             } // end switch
 444
 445
 446             //this.timerPrint("parseScope TOK : " + token.toString());
 447             token = this.ts.nextTok();
 448             //if (this.ts.nextT()) break;
 449
 450         }
 451     },
 452
 453
 454     parseExpression : function() {
 455
 456         // Parse the expression until we encounter a comma or a semi-colon
 457         // in the same brace nesting, bracket nesting and paren nesting.
 458         // Parse functions if any...
 459         //println("<i>EXP</i><BR/>");
 460         !this.debug || print("PARSE EXPR");
 461         var symbol;
 462         var token;
 463         var currentScope;
 464         var identifier;
 465
 466         var expressionBraceNesting = this.braceNesting;
 467         var bracketNesting = 0;
 468         var parensNesting = 0;
 469
 470         var isObjectLitAr = [ false ];
 471         while (token = this.ts.lookTok()) {
 472
 473
 474
 475             currentScope = this.scopes[this.scopes.length-1];
 476
 477             //println("<i>"+token.data+"</i>");
 478             !this.debug|| print ("EXP" + token.toString());
 479             switch (token.type) {
 480                 case 'PUNC':
 481                     switch(token.data) {
 482
 483                         case ';':
 484                         case ',':
 485                             if (this.braceNesting == expressionBraceNesting &&
 486                                     bracketNesting == 0 &&
 487                                     parensNesting == 0) {
 488
 489                                 return;
 490                             }
 491                             break;
 492
 493
 494
 495                         case '{': //Token.LC:
 496                             isObjectLitAr.push(false);
 497
 498                             this.braceNesting++;
 499                             break;
 500
 501                         case '}': //Token.RC:
 502                             this.braceNesting--;
 503                             isObjectLitAr.pop();
 504
 505                            // assert braceNesting >= expressionBraceNesting;
 506                             break;
 507
 508                         case '[': //Token.LB:
 509                             bracketNesting++;
 510                             break;
 511
 512                         case ']': //Token.RB:
 513                             bracketNesting--;
 514                             break;
 515
 516                         case '(': //Token.LP:
 517                             parensNesting++;
 518                             break;
 519
 520                         case ')': //Token.RP:
 521                             parensNesting--;
 522                             break;
 523                     }
 524                     break;
 525
 526                 case 'STRN': // used for object lit detection..
 527                     if (this.ts.lookTok(-1).data == "{" && this.ts.lookTok(1).data == ":" ) {
 528                         // then we are in an object lit.. -> we need to flag the brace as such...
 529                         isObjectLitAr.pop();
 530                         isObjectLitAr.push(true);
 531                     }
 532
 533
 534
 535                     var isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 536                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ":"  &&
 537                         ( this.ts.lookTok(-1).data == "{"  ||  this.ts.lookTok(-1).data == "," )) {
 538                         // see if we can replace..
 539                         // remove the quotes..
 540                         var str = token.data.substring(1,token.data.length-1);
 541                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 542                             token.outData = str;
 543                         }
 544
 545
 546
 547                     }
 548
 549                     break;
 550
 551
 552
 553                 case 'NAME':
 554
 555                     symbol = token.data;
 556                     if (this.ts.lookTok(-1).data == "{"  && this.ts.lookTok(1).data == ":") {
 557                         // then we are in an object lit.. -> we need to flag the brace as such...
 558                         isObjectLitAr.pop();
 559                         isObjectLitAr.push(true);
 560                         break;
 561                     }
 562                     var isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 563                     if (isInObjectLitAr && this.ts.lookTok(-1).data == "," && this.ts.lookTok(1).data == ":") {
 564                         break;
 565                     }
 566
 567                     if (this.ts.lookTok(-1).data == ".") {
 568                         //skip '.'
 569                         break;
 570                     }
 571
 572                      if (this.mode == 'MUNGING_SYMBOL_TREE') {
 573
 574                         identifier = this.getIdentifier(symbol, currentScope);
 575                         //println("<B>??</B>");
 576                         if (identifier == false) {
 577
 578                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 579                                 // Here, we found an undeclared and un-namespaced symbol that is
 580                                 // 3 characters or less in length. Declare it in the global scope.
 581                                 // We don't need to declare longer symbols since they won't cause
 582                                 // any conflict with other munged symbols.
 583                                 this.globalScope.declareIdentifier(symbol, token);
 584                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 585                             } else {
 586                                 //println("undeclared")
 587                             }
 588
 589
 590                         } else {
 591                             //println("<B>++</B>");
 592                             token.identifier = identifier;
 593                             identifier.refcount++;
 594                         }
 595
 596                     }
 597                     break;
 598
 599
 600
 601
 602                     //println("<B>EID</B>");
 603                  case 'KEYW':
 604
 605                     if (token.name == "FUNCTION") {
 606
 607                         this.parseFunctionDeclaration();
 608                         break;
 609                     }
 610
 611
 612
 613                     symbol = token.data;
 614                     if (this.mode == 'BUILDING_SYMBOL_TREE') {
 615
 616                         if (symbol == "eval") {
 617                             if (this.ts.look(-1).type == 'COMM') {
 618                                 // look for eval:var:noreplace\n
 619                                 var _t = this;
 620                                 this.ts.look(-1).data.replace(/eval:var:([a-z]+)/ig, function(m, a) {
 621                                     var hi = _t.getIdentifier(a, currentScope);
 622                                    //println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 623                                     if (hi) {
 624                                       //  println("PROTECT "+a+" from munge");
 625                                         hi.toMunge = false;
 626                                     }
 627
 628
 629                                 });
 630
 631                             } else {
 632                                 this.protectScopeFromObfuscation(currentScope);
 633                                 this.warn("Using 'eval' is not recommended." + (this.munge ? " Moreover, using 'eval' reduces the level of compression!" : ""), true);
 634                             }
 635
 636
 637                         }
 638                         break;
 639                     }
 640
 641             }
 642             if (!this.ts.nextTok()) break;
 643         }
 644     },
 645
 646
 647     parseCatch : function() {
 648
 649         var symbol;
 650         var token;
 651         var currentScope;
 652         var identifier;
 653
 654         //token = getToken(-1);
 655         //assert token.getType() == Token.CATCH;
 656         token = this.ts.nextTok();
 657         //assert token.getType() == Token.LP; (
 658         token = this.ts.nextTok();
 659         //assert token.getType() == Token.NAME;
 660
 661         symbol = token.data;
 662         currentScope = this.scopes[this.scopes.length-1];
 663
 664         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 665             // We must declare the exception identifier in the containing function
 666             // scope to avoid errors related to the obfuscation process. No need to
 667             // display a warning if the symbol was already declared here...
 668             currentScope.declareIdentifier(symbol, token);
 669         } else {
 670             //?? why inc the refcount?? - that should be set when building the tree???
 671             identifier = this.getIdentifier(symbol, currentScope);
 672             identifier.refcount++;
 673         }
 674
 675         token = this.ts.nextTok();
 676         //assert token.getType() == Token.RP; // )
 677     },
 678
 679     parseFunctionDeclaration : function()
 680     {
 681
 682         var symbol;
 683         var token;
 684         var currentScope  = false;
 685         var fnScope = false;
 686         var identifier;
 687         //this.logR("<B>PARSING FUNCTION</B>");
 688         currentScope = this.scopes[this.scopes.length-1];
 689
 690         token = this.ts.nextTok();
 691         if (token.type == "NAME") {
 692             if (this.mode == 'BUILDING_SYMBOL_TREE') {
 693                 // Get the name of the function and declare it in the current scope.
 694                 symbol = token.data;
 695                 if (currentScope.getIdentifier(symbol) != false) {
 696                     this.warn("The function " + symbol + " has already been declared in the same scope...", true);
 697                 }
 698                 currentScope.declareIdentifier(symbol,token);
 699             }
 700             token =  this.ts.nextTok();
 701         }
 702
 703         //assert token.getType() == Token.LP;
 704         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 705             fnScope = new Scope(this.braceNesting, currentScope, token.n, '');
 706
 707             //println("STORING SCOPE" + this.ts.cursor);
 708
 709             this.indexedScopes[this.ts.cursor] = fnScope;
 710
 711         } else {
 712             //println("FETCHING SCOPE" + this.ts.cursor);
 713             fnScope = this.indexedScopes[this.ts.cursor];
 714         }
 715
 716         // Parse function arguments.
 717         var argpos = 0;
 718         while (!this.ts.lookTok().data == ')') { //(token = consumeToken()).getType() != Token.RP) {
 719             token = this.ts.nextTok();
 720
 721             //assert token.getType() == Token.NAME ||
 722             //        token.getType() == Token.COMMA;
 723             if (token.type == 'NAME' && this.mode == 'BUILDING_SYMBOL_TREE') {
 724                 symbol = token.data;
 725                 identifier = fnScope.declareIdentifier(symbol,token);
 726                 if (symbol == "$super" && argpos == 0) {
 727                     // Exception for Prototype 1.6...
 728                     identifier.preventMunging();
 729                 }
 730                 argpos++;
 731             }
 732         }
 733
 734         token = this.ts.nextTok();
 735         // assert token.getType() == Token.LC;
 736         this.braceNesting++;
 737
 738         token = this.ts.nextTok();
 739         if (token.type == "STRN" && this.ts.lookTok(1).data == ';') {
 740             /*
 741
 742             NOT SUPPORTED YET!?!!?!
 743
 744             // This is a hint. Hints are empty statements that look like
 745             // "localvar1:nomunge, localvar2:nomunge"; They allow developers
 746             // to prevent specific symbols from getting obfuscated (some heretic
 747             // implementations, such as Prototype 1.6, require specific variable
 748             // names, such as $super for example, in order to work appropriately.
 749             // Note: right now, only "nomunge" is supported in the right hand side
 750             // of a hint. However, in the future, the right hand side may contain
 751             // other values.
 752             consumeToken();
 753             String hints = token.getValue();
 754             // Remove the leading and trailing quotes...
 755             hints = hints.substring(1, hints.length() - 1).trim();
 756             StringTokenizer st1 = new StringTokenizer(hints, ",");
 757             while (st1.hasMoreTokens()) {
 758                 String hint = st1.nextToken();
 759                 int idx = hint.indexOf(':');
 760                 if (idx <= 0 || idx >= hint.length() - 1) {
 761                     if (mode == BUILDING_SYMBOL_TREE) {
 762                         // No need to report the error twice, hence the test...
 763                         this.warn("Invalid hint syntax: " + hint, true);
 764                     }
 765                     break;
 766                 }
 767                 String variableName = hint.substring(0, idx).trim();
 768                 String variableType = hint.substring(idx + 1).trim();
 769                 if (mode == BUILDING_SYMBOL_TREE) {
 770                     fnScope.addHint(variableName, variableType);
 771                 } else if (mode == CHECKING_SYMBOL_TREE) {
 772                     identifier = fnScope.getIdentifier(variableName);
 773                     if (identifier != null) {
 774                         if (variableType.equals("nomunge")) {
 775                             identifier.preventMunging();
 776                         } else {
 777                             this.warn("Unsupported hint value: " + hint, true);
 778                         }
 779                     } else {
 780                         this.warn("Hint refers to an unknown identifier: " + hint, true);
 781                     }
 782                 }
 783             }
 784             */
 785         }
 786
 787         this.parseScope(fnScope);
 788         // now pop it off the stack!!!
 789
 790
 791
 792     },
 793
 794     protectScopeFromObfuscation : function(scope) {
 795             //assert scope != null;
 796
 797         if (scope == this.globalScope) {
 798             // The global scope does not get obfuscated,
 799             // so we don't need to worry about it...
 800             return;
 801         }
 802
 803         // Find the highest local scope containing the specified scope.
 804         while (scope && scope.parent != this.globalScope) {
 805             scope = scope.parent;
 806         }
 807
 808         //assert scope.getParentScope() == globalScope;
 809         scope.preventMunging();
 810     },
 811
 812     getIdentifier: function(symbol, scope) {
 813         var identifier;
 814         while (scope != false) {
 815             identifier = scope.getIdentifier(symbol);
 816             //println("ScopeParser.getIdentgetUsedSymbols("+symbol+")=" + scope.getUsedSymbols().join(','));
 817             if (identifier) {
 818                 return identifier;
 819             }
 820             scope = scope.parent;
 821         }
 822         return false;
 823     }
 824 };