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