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         //print('****************' + s);
 102         this.warnings.push(s);
 103         //println("WARNING:" + htmlescape(s) + "<BR>");
 104     },
 105     // defaults should not be initialized here =- otherwise they get duped on new, rather than initalized..
 106     warnings : false,
 107     ts : false,
 108     scopes : false,
 109     global : false,
 110     mode : "", //"BUILDING_SYMBOL_TREE",
 111     braceNesting : 0,
 112     indexedScopes : false,
 113     munge: true,
 114
 115
 116
 117
 118
 119     buildSymbolTree : function()
 120     {
 121         //println("<PRE>");
 122
 123         this.ts.rewind();
 124         this.braceNesting = 0;
 125         this.scopes = [];
 126
 127
 128
 129
 130         this.globalScope = new  Scope(-1, false, -1, '');
 131         indexedScopes = { 0 : this.globalScope };
 132
 133         this.mode = 'BUILDING_SYMBOL_TREE';
 134         this.parseScope(this.globalScope);
 135
 136         //print("---------------END PASS 1 ---------------- ");
 137
 138     },
 139     mungeSymboltree : function()
 140     {
 141
 142         if (!this.munge) {
 143             return;
 144         }
 145
 146         // One problem with obfuscation resides in the use of undeclared
 147         // and un-namespaced global symbols that are 3 characters or less
 148         // in length. Here is an example:
 149         //
 150         //     var declaredGlobalVar;
 151         //
 152         //     function declaredGlobalFn() {
 153         //         var localvar;
 154         //         localvar = abc; // abc is an undeclared global symbol
 155         //     }
 156         //
 157         // In the example above, there is a slim chance that localvar may be
 158         // munged to 'abc', conflicting with the undeclared global symbol
 159         // abc, creating a potential bug. The following code detects such
 160         // global symbols. This must be done AFTER the entire file has been
 161         // parsed, and BEFORE munging the symbol tree. Note that declaring
 162         // extra symbols in the global scope won't hurt.
 163         //
 164         // Note: Since we go through all the tokens to do this, we also use
 165         // the opportunity to count how many times each identifier is used.
 166
 167         this.ts.rewind();
 168         this.braceNesting = 0;
 169         this.scopes= [];
 170         this.mode = 'PASS2_SYMBOL_TREE';
 171
 172         //println("MUNGING?");
 173
 174         this.parseScope(this.globalScope);
 175         this.globalScope.munge();
 176     },
 177
 178
 179     log : function(str)
 180     {
 181         print ("                    ".substring(0, this.braceNesting*2) + str);
 182
 183         //println("<B>LOG:</B>" + htmlescape(str) + "<BR/>\n");
 184     },
 185     logR : function(str)
 186     {
 187             //println("<B>LOG:</B>" + str + "<BR/>");
 188     },
 189
 190
 191     dumpLine : false,
 192     dumpToken: function (tok, scope, brace) {
 193         if (this.dumpLine == false) {
 194             this.dumpLine = {
 195                 str : '' +tok.data,
 196                 scope : scope.length,
 197                 brace : brace
 198             }
 199             return;
 200         }
 201
 202         if (this.dumpLine.scope == scope.length && this.dumpLine.brace == brace) {
 203             this.dumpLine.str += ' ' + tok.data;
 204             return;
 205         }
 206         print(
 207             (new Array(this.dumpLine.scope)).join("  ") + '|' +
 208             (new Array(brace)).join("  ") + this.dumpLine.str);
 209
 210
 211         this.dumpLine = {
 212             str : '' +tok.data,
 213             scope : scope.length,
 214             brace : brace
 215         }
 216
 217     },
 218
 219
 220
 221     parseScope : function(scope) // parse a token stream..
 222     {
 223         //this.timerPrint("parseScope EnterScope");
 224         //this.log(">>> ENTER SCOPE" + this.scopes.length);
 225         var symbol;
 226         var token;
 227
 228         var identifier;
 229
 230         var expressionBraceNesting = this.braceNesting;
 231
 232         var parensNesting = 0;
 233
 234         var isObjectLitAr = [ false ];
 235         var isInObjectLitAr;
 236         this.scopes.push(scope);
 237
 238         var scopeIndent = '';
 239         this.scopes.forEach(function() {
 240             scopeIndent += '   ';
 241         });
 242         print(scopeIndent + ">> ENTER SCOPE");
 243
 244
 245
 246
 247         token = this.ts.lookTok(1);
 248         while (token) {
 249           //  this.timerPrint("parseScope AFTER lookT: " + token.toString());
 250             this.dumpToken(token , this.scopes, expressionBraceNesting);
 251             //this.log(token.data);
 252             if (token.type == 'NAME') {
 253             //    print('*' + token.data);
 254             }
 255             switch(token.type + '.' + token.name) {
 256                 case "KEYW.VAR":
 257                 case "KEYW.CONST": // not really relivant as it's only mozzy that does this.
 258
 259                     //this.log("parseScope GOT VAR/CONST : " + token.toString());
 260                     while (true) {
 261                         token = this.ts.nextTok();
 262                         !this.debug|| print( token.toString());
 263
 264                         if (!token) { // can return false at EOF!
 265                             break;
 266                         }
 267                         if (token.name == "VAR" || token.data == ',') { // kludge..
 268                             continue;
 269                         }
 270                         //this.logR("parseScope GOT VAR  : <B>" + token.toString() + "</B>");
 271                         if (token.type !="NAME") {
 272                             for(var i = Math.max(this.ts.cursor-10,0); i < this.ts.cursor+1; i++) {
 273                                 print(this.ts.tokens[i].toString());
 274                             }
 275
 276                             print( "var without ident");
 277                             Seed.quit()
 278                         }
 279
 280
 281                         if (this.mode == "BUILDING_SYMBOL_TREE") {
 282                             identifier = scope.getIdentifier(token.data) ;
 283
 284                             if (identifier == false) {
 285                                 scope.declareIdentifier(token.data, token);
 286                             } else {
 287                                 token.identifier = identifier;
 288                                 this.warn("(SCOPE) The variable " + token.data  + ' (line:' + token.line + ")  has already been declared in the same scope...");
 289                             }
 290                         }
 291
 292                         token = this.ts.nextTok();
 293                         !this.debug|| print(token.toString());
 294                         /*
 295                         assert token.getType() == Token.SEMI ||
 296                                 token.getType() == Token.ASSIGN ||
 297                                 token.getType() == Token.COMMA ||
 298                                 token.getType() == Token.IN;
 299                         */
 300                         if (token.name == "IN") {
 301                             break;
 302                         } else {
 303                             //var bn = this.braceNesting;
 304                             this.parseExpression();
 305                             //this.braceNesting = bn;
 306                             //this.logR("parseScope DONE  : <B>ParseExpression</B> - tok is:" + this.ts.lookT(0).toString());
 307
 308                             token = this.ts.lookTok(1);
 309                             !this.debug|| print("AFTER EXP: " + token.toString());
 310                             if (token.data == ';') {
 311                                 break;
 312                             }
 313                         }
 314                     }
 315                     break;
 316                 case "KEYW.FUNCTION":
 317                     //println("<i>"+token.data+"</i>");
 318                      var bn = this.braceNesting;
 319                     this.parseFunctionDeclaration();
 320                      this.braceNesting = bn;
 321                     break;
 322
 323                 case "PUNC.LEFT_CURLY": // {
 324                     //println("<i>"+token.data+"</i>");
 325                     isObjectLitAr.push(false);
 326                     this.braceNesting++;
 327
 328                     //print(">>>>>> OBJLIT PUSH(false)" + this.braceNesting);
 329                     break;
 330
 331                 case "PUNC.RIGHT_CURLY": // }
 332                     //println("<i>"+token.data+"</i>");
 333                     this.braceNesting--;
 334                     isObjectLitAr.pop();
 335                     //print(">>>>>> OBJLIT POP"+ this.braceNesting);
 336                         //assert braceNesting >= scope.getBra ceNesting();
 337
 338                     if (this.braceNesting < expressionBraceNesting) {
 339                         var ls = this.scopes.pop();
 340                         ls.getUsedSymbols();
 341                         // eat symbol if we are currently at {
 342                         if (this.ts.look(0).data == '{') {
 343                             this.ts.nextTok();
 344                         }
 345
 346                         //print("<<<<<<<EXIT SCOPE" +this.scopes.length);
 347                         return;
 348                     }
 349                     break;
 350
 351                 case "KEYW.WITH":
 352                     //println("<i>"+token.data+"</i>");
 353                     if (this.mode == "BUILDING_SYMBOL_TREE") {
 354                         // Inside a 'with' block, it is impossible to figure out
 355                         // statically whether a symbol is a local variable or an
 356                         // object member. As a consequence, the only thing we can
 357                         // do is turn the obfuscation off for the highest scope
 358                         // containing the 'with' block.
 359                         this.protectScopeFromObfuscation(scope);
 360                         this.warn("Using 'with' is not recommended." + (this.munge ? " Moreover, using 'with' reduces the level of compression!" : ""), true);
 361                     }
 362                     break;
 363
 364                 case "KEYW.CATCH":
 365                     //println("<i>"+token.data+"</i>");
 366                     this.parseCatch();
 367                     break;
 368                 /*
 369                 case Token.SPECIALCOMMENT:
 370                         if (mode == BUILDING_SYMBOL_TREE) {
 371                             protectScopeFromObfuscation(scope);
 372                             this.warn("Using JScript conditional comments is not recommended." + (munge ? " Moreover, using JScript conditional comments reduces the level of compression." : ""), true);
 373                         }
 374                         break;
 375                 */
 376
 377                 case "STRN.DOUBLE_QUOTE": // used for object lit detection..
 378                 case "STRN.SINGLE_QUOTE":
 379                     //println("<i>"+token.data+"</i>");
 380                     if (this.ts.lookTok(-1).data == '{' && this.ts.lookTok(1).data == ':') {
 381                         // then we are in an object lit.. -> we need to flag the brace as such...
 382                         isObjectLitAr.pop();
 383                         isObjectLitAr.push(true);
 384                         //print(">>>>>> OBJLIT REPUSH(true)");
 385                     }
 386                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 387
 388                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ':' &&
 389                         ( this.ts.lookTok(-1).data == '{'  ||  this.ts.lookTok(-1).data == ':' )) {
 390                         // see if we can replace..
 391                         // remove the quotes..
 392                         // should do a bit more checking!!!! (what about wierd char's in the string..
 393                         var str = token.data.substring(1,token.data.length-1);
 394                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 395                             token.outData = str;
 396                         }
 397
 398
 399
 400                     }
 401
 402
 403
 404                     break;
 405
 406                 case "NAME.NAME":
 407
 408                     //print("DEAL WITH NAME:");
 409                     // got identifier..
 410
 411                     // look for  { ** : <- indicates obj literal.. ** this could occur with numbers ..
 412                     if ((this.ts.lookTok(-1).data == "{") && (this.ts.lookTok(1).data == ":")) {
 413                         isObjectLitAr.pop();
 414                         isObjectLitAr.push(true);
 415                         //print(">>>>>> OBJLIT REPUSH(true)");
 416                         //println("<i>"+token.data+"</i>");
 417                         break;
 418                     }
 419                    // print("DEAL WITH obj lit:");
 420                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 421
 422                     if (isInObjectLitAr && (this.ts.lookTok(1).data == ":") && (this.ts.lookTok(-1).data == ",")) {
 423                         // skip, it's an object lit key..
 424                         //println("<i>"+token.data+"</i>");
 425                         break;
 426                     }
 427
 428
 429                     // skip anyting with "." before it..!!
 430
 431                     if (this.ts.lookTok(-1).data == ".") {
 432                         // skip, it's an object prop.
 433                         //println("<i>"+token.data+"</i>");
 434                         break;
 435                     }
 436                     symbol = token.data;
 437                     if (this.mode == 'PASS2_SYMBOL_TREE') {
 438
 439                         //println("GOT IDENT: -2 : " + this.ts.lookT(-2).toString() + " <BR> ..... -1 :  " +  this.ts.lookT(-1).toString() + " <BR> ");
 440
 441                         //print ("MUNGE?" + symbol);
 442
 443                         //println("GOT IDENT: <B>" + symbol + "</B><BR/>");
 444
 445                             //println("GOT IDENT (2): <B>" + symbol + "</B><BR/>");
 446                         identifier = this.getIdentifier(symbol, scope);
 447
 448                         if (identifier == false) {
 449 // BUG!find out where builtin is defined...
 450                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 451                                 // Here, we found an undeclared and un-namespaced symbol that is
 452                                 // 3 characters or less in length. Declare it in the global scope.
 453                                 // We don't need to declare longer symbols since they won't cause
 454                                 // any conflict with other munged symbols.
 455                                 this.globalScope.declareIdentifier(symbol, token);
 456                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 457                             }
 458
 459                             //println("GOT IDENT IGNORE(3): <B>" + symbol + "</B><BR/>");
 460                         } else {
 461                             token.identifier = identifier;
 462                             identifier.refcount++;
 463                         }
 464                     }
 465
 466                     break;
 467                     //println("<B>SID</B>");
 468                 default:
 469                     if (token.type != 'KEYW') {
 470                         break;
 471                     }
 472                    // print("Check eval:");
 473
 474                     symbol = token.data;
 475
 476                      if (this.mode == 'BUILDING_SYMBOL_TREE') {
 477
 478                         if (symbol == "eval") {
 479                             // look back one and see if we can find a comment!!!
 480                             if (this.ts.look(-1).type == "COMM") {
 481                                 // look for eval:var:noreplace\n
 482                                 var _t = this;
 483                                 this.ts.look(-1).data.replace(/eval:var:([a-z_]+)/ig, function(m, a) {
 484
 485                                     var hi = _t.getIdentifier(a, scope);
 486                                    // println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 487                                     if (hi) {
 488                                      //   println("PROTECT "+a+" from munge");
 489                                         hi.toMunge = false;
 490                                     }
 491
 492                                 });
 493
 494
 495                             } else {
 496
 497
 498                                 this.protectScopeFromObfuscation(scope);
 499                                 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);
 500                             }
 501
 502                         }
 503
 504                     }
 505                     break;
 506
 507
 508             } // end switch
 509
 510
 511             //this.timerPrint("parseScope TOK : " + token.toString());
 512             token = this.ts.nextTok();
 513             //if (this.ts.nextT()) break;
 514
 515         }
 516         //print("<<<<<<<EXIT SCOPE ERR?" +this.scopes.length);
 517     },
 518
 519
 520     parseExpression : function() {
 521
 522         // Parse the expression until we encounter a comma or a semi-colon
 523         // in the same brace nesting, bracket nesting and paren nesting.
 524         // Parse functions if any...
 525         //println("<i>EXP</i><BR/>");
 526         !this.debug || print("PARSE EXPR");
 527
 528
 529         // for printing stuff..
 530
 531
 532
 533         var symbol;
 534         var token;
 535         var currentScope;
 536         var identifier;
 537
 538         var expressionBraceNesting = this.braceNesting;
 539         var bracketNesting = 0;
 540         var parensNesting = 0;
 541         var isInObjectLitAr;
 542         var isObjectLitAr = [ false ];
 543
 544         currentScope = this.scopes[this.scopes.length-1];
 545
 546         var scopeIndent = '';
 547         this.scopes.forEach(function() {
 548             scopeIndent += '   ';
 549         });
 550         print(scopeIndent + ">> ENTER EXPRESSION");
 551         while (token = this.ts.lookTok()) {
 552
 553
 554
 555            /*
 556             // moved out of loop?
 557            currentScope = this.scopes[this.scopes.length-1];
 558
 559             var scopeIndent = '';
 560             this.scopes.forEach(function() {
 561                 scopeIndent += '   ';
 562             });
 563            */
 564
 565            this.dumpToken(token,  this.scopes, this.braceNesting );
 566
 567
 568             //println("<i>"+token.data+"</i>");
 569             //this.log("EXP:" + token.data);
 570             switch (token.type) {
 571                 case 'PUNC':
 572                     switch(token.data) {
 573
 574                         case ';':
 575                         case ',':
 576                             if (this.braceNesting == expressionBraceNesting &&
 577                                     bracketNesting == 0 &&
 578                                     parensNesting == 0) {
 579                                 print(scopeIndent + "<< EXIT EXPRESSION");
 580                                 return;
 581                             }
 582                             break;
 583
 584
 585
 586                         case '{': //Token.LC:
 587                             isObjectLitAr.push(false);
 588
 589                             this.braceNesting++;
 590                             ///print(">>>>> EXP PUSH(false)"+this.braceNesting);
 591                             break;
 592
 593                         case '}': //Token.RC:
 594                             this.braceNesting--;
 595                             isObjectLitAr.pop();
 596                             //print(">>>>> EXP POP" + this.braceNesting);
 597                            // assert braceNesting >= expressionBraceNesting;
 598                             break;
 599
 600                         case '[': //Token.LB:
 601                             bracketNesting++;
 602                             break;
 603
 604                         case ']': //Token.RB:
 605                             bracketNesting--;
 606                             break;
 607
 608                         case '(': //Token.LP:
 609                             parensNesting++;
 610                             break;
 611
 612                         case ')': //Token.RP:
 613                             parensNesting--;
 614                             break;
 615                     }
 616                     break;
 617
 618                 case 'STRN': // used for object lit detection..
 619                     if (this.ts.lookTok(-1).data == "{" && this.ts.lookTok(1).data == ":" ) {
 620                         // then we are in an object lit.. -> we need to flag the brace as such...
 621                         isObjectLitAr.pop();
 622                         isObjectLitAr.push(true);
 623                         //print(">>>>> EXP PUSH(true)");
 624                     }
 625
 626
 627
 628                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 629                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ":"  &&
 630                         ( this.ts.lookTok(-1).data == "{"  ||  this.ts.lookTok(-1).data == "," )) {
 631                         // see if we can replace..
 632                         // remove the quotes..
 633                         var str = token.data.substring(1,token.data.length-1);
 634                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 635                             token.outData = str;
 636                         }
 637
 638
 639
 640                     }
 641
 642                     break;
 643
 644
 645
 646                 case 'NAME':
 647
 648                     symbol = token.data;
 649                     //print("in NAME = " + token.toString());
 650                     //print("in NAME 0: " + this.ts.look(0).toString());
 651                     //print("in NAME 2: " + this.ts.lookTok(2).toString());
 652                     if (this.ts.look(0).data == "{"  && this.ts.lookTok(2).data == ":") {
 653                         // then we are in an object lit.. -> we need to flag the brace as such...
 654                         isObjectLitAr.pop();
 655                         isObjectLitAr.push(true);
 656                          //print(">>>>> EXP  PUSH(true)");
 657                         break;
 658                     }
 659
 660                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 661                     //print ("isInObjectLitAr : " + isInObjectLitAr + ' ' + token.toString());
 662
 663                     if (isInObjectLitAr && this.ts.lookTok(0).data == "," && this.ts.lookTok(2).data == ":") {
 664                         break;
 665                     }
 666                     //print(this.ts.lookTok(0).data);
 667                     if (this.ts.lookTok(0).data == ".") {
 668                         //skip '.'
 669                         break;
 670                     }
 671
 672                      if (this.mode == 'PASS2_SYMBOL_TREE') {
 673
 674                         identifier = this.getIdentifier(symbol, currentScope);
 675                         //println("<B>??</B>");
 676                         if (identifier == false) {
 677
 678                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 679                                 // Here, we found an undeclared and un-namespaced symbol that is
 680                                 // 3 characters or less in length. Declare it in the global scope.
 681                                 // We don't need to declare longer symbols since they won't cause
 682                                 // any conflict with other munged symbols.
 683                                 this.globalScope.declareIdentifier(symbol, token);
 684                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 685                             } else {
 686                                 //println("undeclared")
 687                             }
 688
 689
 690                         } else {
 691                             //println("<B>++</B>");
 692                             token.identifier = identifier;
 693                             identifier.refcount++;
 694                         }
 695
 696                     }
 697                     break;
 698
 699
 700
 701
 702                     //println("<B>EID</B>");
 703                  case 'KEYW':
 704
 705                     if (token.name == "FUNCTION") {
 706
 707                         this.parseFunctionDeclaration();
 708                         break;
 709                     }
 710
 711
 712
 713                     symbol = token.data;
 714                     if (this.mode == 'BUILDING_SYMBOL_TREE') {
 715
 716                         if (symbol == "eval") {
 717                             if (this.ts.look(-1).type == 'COMM') {
 718                                 // look for eval:var:noreplace\n
 719                                 var _t = this;
 720                                 this.ts.look(-1).data.replace(/eval:var:([a-z]+)/ig, function(m, a) {
 721                                     var hi = _t.getIdentifier(a, currentScope);
 722                                    //println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 723                                     if (hi) {
 724                                       //  println("PROTECT "+a+" from munge");
 725                                         hi.toMunge = false;
 726                                     }
 727
 728
 729                                 });
 730
 731                             } else {
 732                                 this.protectScopeFromObfuscation(currentScope);
 733                                 this.warn("Using 'eval' is not recommended." + (this.munge ? " Moreover, using 'eval' reduces the level of compression!" : ""), true);
 734                             }
 735
 736
 737                         }
 738                         break;
 739                     }
 740
 741             }
 742             if (!this.ts.nextTok()) break;
 743         }
 744         print(scopeIndent + "<< EXIT EXPRESSION");
 745     },
 746
 747
 748     parseCatch : function() {
 749
 750         var symbol;
 751         var token;
 752         var currentScope;
 753         var identifier;
 754
 755         //token = getToken(-1);
 756         //assert token.getType() == Token.CATCH;
 757         token = this.ts.nextTok();
 758         //assert token.getType() == Token.LP; (
 759         token = this.ts.nextTok();
 760         //assert token.getType() == Token.NAME;
 761
 762         symbol = token.data;
 763         currentScope = this.scopes[this.scopes.length-1];
 764
 765         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 766             // We must declare the exception identifier in the containing function
 767             // scope to avoid errors related to the obfuscation process. No need to
 768             // display a warning if the symbol was already declared here...
 769             currentScope.declareIdentifier(symbol, token);
 770         } else {
 771             //?? why inc the refcount?? - that should be set when building the tree???
 772             identifier = this.getIdentifier(symbol, currentScope);
 773             identifier.refcount++;
 774         }
 775
 776         token = this.ts.nextTok();
 777         //assert token.getType() == Token.RP; // )
 778     },
 779
 780     parseFunctionDeclaration : function()
 781     {
 782        // print("PARSE FUNCTION");
 783         var symbol;
 784         var token;
 785         var currentScope  = false;
 786         var fnScope = false;
 787         var identifier;
 788         //this.logR("<B>PARSING FUNCTION</B>");
 789         currentScope = this.scopes[this.scopes.length-1];
 790
 791         token = this.ts.nextTok();
 792         if (token.type == "NAME") {
 793             if (this.mode == 'BUILDING_SYMBOL_TREE') {
 794                 // Get the name of the function and declare it in the current scope.
 795                 symbol = token.data;
 796                 if (currentScope.getIdentifier(symbol) != false) {
 797                     this.warn("The function " + symbol + " has already been declared in the same scope...", true);
 798                 }
 799                 currentScope.declareIdentifier(symbol,token);
 800             }
 801             token =  this.ts.nextTok();
 802         }
 803
 804         //assert token.getType() == Token.LP;
 805         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 806             fnScope = new Scope(this.braceNesting, currentScope, token.n, '');
 807
 808             //println("STORING SCOPE" + this.ts.cursor);
 809
 810             this.indexedScopes[this.ts.cursor] = fnScope;
 811
 812         } else {
 813             //qln("FETCHING SCOPE" + this.ts.cursor);
 814             fnScope = this.indexedScopes[this.ts.cursor];
 815
 816         }
 817
 818         // Parse function arguments.
 819         var argpos = 0;
 820         while (this.ts.lookTok().data != ')') { //(token = consumeToken()).getType() != Token.RP) {
 821             token = this.ts.nextTok();
 822            // print ("FUNC ARGS: " + token.toString())
 823             //assert token.getType() == Token.NAME ||
 824             //        token.getType() == Token.COMMA;
 825             if (token.type == 'NAME' && this.mode == 'BUILDING_SYMBOL_TREE') {
 826                 symbol = token.data;
 827                 identifier = fnScope.declareIdentifier(symbol,token);
 828                 if (symbol == "$super" && argpos == 0) {
 829                     // Exception for Prototype 1.6...
 830                     identifier.preventMunging();
 831                 }
 832                 argpos++;
 833             }
 834         }
 835
 836         token = this.ts.nextTok();
 837         // assert token.getType() == Token.LC;
 838         this.braceNesting++;
 839
 840         token = this.ts.nextTok();
 841         if (token.type == "STRN" && this.ts.lookTok(1).data == ';') {
 842             /*
 843
 844             NOT SUPPORTED YET!?!!?!
 845
 846             // This is a hint. Hints are empty statements that look like
 847             // "localvar1:nomunge, localvar2:nomunge"; They allow developers
 848             // to prevent specific symbols from getting obfuscated (some heretic
 849             // implementations, such as Prototype 1.6, require specific variable
 850             // names, such as $super for example, in order to work appropriately.
 851             // Note: right now, only "nomunge" is supported in the right hand side
 852             // of a hint. However, in the future, the right hand side may contain
 853             // other values.
 854             consumeToken();
 855             String hints = token.getValue();
 856             // Remove the leading and trailing quotes...
 857             hints = hints.substring(1, hints.length() - 1).trim();
 858             StringTokenizer st1 = new StringTokenizer(hints, ",");
 859             while (st1.hasMoreTokens()) {
 860                 String hint = st1.nextToken();
 861                 int idx = hint.indexOf(':');
 862                 if (idx <= 0 || idx >= hint.length() - 1) {
 863                     if (mode == BUILDING_SYMBOL_TREE) {
 864                         // No need to report the error twice, hence the test...
 865                         this.warn("Invalid hint syntax: " + hint, true);
 866                     }
 867                     break;
 868                 }
 869                 String variableName = hint.substring(0, idx).trim();
 870                 String variableType = hint.substring(idx + 1).trim();
 871                 if (mode == BUILDING_SYMBOL_TREE) {
 872                     fnScope.addHint(variableName, variableType);
 873                 } else if (mode == CHECKING_SYMBOL_TREE) {
 874                     identifier = fnScope.getIdentifier(variableName);
 875                     if (identifier != null) {
 876                         if (variableType.equals("nomunge")) {
 877                             identifier.preventMunging();
 878                         } else {
 879                             this.warn("Unsupported hint value: " + hint, true);
 880                         }
 881                     } else {
 882                         this.warn("Hint refers to an unknown identifier: " + hint, true);
 883                     }
 884                 }
 885             }
 886             */
 887         }
 888
 889         this.parseScope(fnScope);
 890         // now pop it off the stack!!!
 891
 892
 893
 894     },
 895
 896     protectScopeFromObfuscation : function(scope) {
 897             //assert scope != null;
 898
 899         if (scope == this.globalScope) {
 900             // The global scope does not get obfuscated,
 901             // so we don't need to worry about it...
 902             return;
 903         }
 904
 905         // Find the highest local scope containing the specified scope.
 906         while (scope && scope.parent != this.globalScope) {
 907             scope = scope.parent;
 908         }
 909
 910         //assert scope.getParentScope() == globalScope;
 911         scope.preventMunging();
 912     },
 913
 914     getIdentifier: function(symbol, scope) {
 915         var identifier;
 916         while (scope != false) {
 917             identifier = scope.getIdentifier(symbol);
 918             //println("ScopeParser.getIdentgetUsedSymbols("+symbol+")=" + scope.getUsedSymbols().join(','));
 919             if (identifier) {
 920                 return identifier;
 921             }
 922             scope = scope.parent;
 923         }
 924         return false;
 925     }
 926 };