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 *
  12 * Need to make this alot simpler...
  13 *
  14 * so debugging is possible.
  15 *
  16 *
  17 * at present it just runs along the stream and finds stuff then calls parseExpr .. etc,,
  18 *
  19 *
  20 * It would be better to parse blocks of code rather than the whole stream..
  21 *
  22 *
  23 *
  24 *
  25 *
  26 */
  27
  28 ScopeParser = function(ts) {
  29     this.ts = ts; // {TokenStream}
  30     this.warnings = [];
  31     this.scopes = [];
  32     this.indexedScopes = {};
  33     this.timer = new Date() * 1;
  34     this.debug = false;
  35 }
  36
  37 // list of keywords that should not be used in object literals.
  38 ScopeParser.idents = [
  39         "break",
  40         "case",
  41         "continue",
  42         "default",
  43         "delete",
  44         "do",
  45         "else",
  46         "export",
  47         "false",
  48         "for",
  49         "function",
  50         "if",
  51         "import",
  52         "in",
  53         "new",
  54         "null",
  55         "return",
  56         "switch",
  57         "this",
  58         "true",
  59         "typeof",
  60         "var",
  61         "void",
  62         "while",
  63         "with",
  64
  65         "catch",
  66         "class",
  67         "const",
  68         "debugger",
  69         "enum",
  70         "extends",
  71         "finally",
  72         "super",
  73         "throw",
  74         "try",
  75
  76         "abstract",
  77         "boolean",
  78         "byte",
  79         "char",
  80         "double",
  81         "final",
  82         "float",
  83         "goto",
  84         "implements",
  85         "instanceof",
  86         "int",
  87         "interface",
  88         "long",
  89         "native",
  90         "package",
  91         "private",
  92         "protected",
  93         "public",
  94         "short",
  95         "static",
  96         "synchronized",
  97         "throws",
  98         "transient",
  99                 "include",
 100                 "undefined"
 101 ];
 102
 103
 104 ScopeParser.prototype = {
 105     timer: 0,
 106     timerPrint: function (str) {
 107         var ntime = new Date() * 1;
 108         var tdif =  ntime -this.timer;
 109         this.timer = ntime;
 110         var pref = '';
 111         if (tdif > 100) { //slower ones..
 112             pref = '***';
 113         }
 114         println(pref+'['+tdif+']'+str);
 115
 116     },
 117     warn: function(s) {
 118         //print('****************' + s);
 119         this.warnings.push(s);
 120         //println("WARNING:" + htmlescape(s) + "<BR>");
 121     },
 122     // defaults should not be initialized here =- otherwise they get duped on new, rather than initalized..
 123     warnings : false,
 124     ts : false,
 125     scopes : false,
 126     global : false,
 127     mode : "", //"BUILDING_SYMBOL_TREE",
 128     braceNesting : 0,
 129     indexedScopes : false,
 130     munge: true,
 131
 132
 133
 134
 135
 136     buildSymbolTree : function()
 137     {
 138         //println("<PRE>");
 139
 140         this.ts.rewind();
 141         this.braceNesting = 0;
 142         this.scopes = [];
 143
 144
 145
 146
 147         this.globalScope = new  Scope(-1, false, -1, '');
 148         indexedScopes = { 0 : this.globalScope };
 149
 150         this.mode = 'BUILDING_SYMBOL_TREE';
 151         this.parseScope(this.globalScope);
 152
 153         //print("---------------END PASS 1 ---------------- ");
 154
 155     },
 156     mungeSymboltree : function()
 157     {
 158
 159         if (!this.munge) {
 160             return;
 161         }
 162
 163         // One problem with obfuscation resides in the use of undeclared
 164         // and un-namespaced global symbols that are 3 characters or less
 165         // in length. Here is an example:
 166         //
 167         //     var declaredGlobalVar;
 168         //
 169         //     function declaredGlobalFn() {
 170         //         var localvar;
 171         //         localvar = abc; // abc is an undeclared global symbol
 172         //     }
 173         //
 174         // In the example above, there is a slim chance that localvar may be
 175         // munged to 'abc', conflicting with the undeclared global symbol
 176         // abc, creating a potential bug. The following code detects such
 177         // global symbols. This must be done AFTER the entire file has been
 178         // parsed, and BEFORE munging the symbol tree. Note that declaring
 179         // extra symbols in the global scope won't hurt.
 180         //
 181         // Note: Since we go through all the tokens to do this, we also use
 182         // the opportunity to count how many times each identifier is used.
 183
 184         this.ts.rewind();
 185         this.braceNesting = 0;
 186         this.scopes= [];
 187         this.mode = 'PASS2_SYMBOL_TREE';
 188
 189         //println("MUNGING?");
 190
 191         this.parseScope(this.globalScope);
 192         this.globalScope.munge();
 193     },
 194
 195
 196     log : function(str)
 197     {
 198         print ("                    ".substring(0, this.braceNesting*2) + str);
 199
 200         //println("<B>LOG:</B>" + htmlescape(str) + "<BR/>\n");
 201     },
 202     logR : function(str)
 203     {
 204             //println("<B>LOG:</B>" + str + "<BR/>");
 205     },
 206
 207
 208
 209
 210
 211     parseScope : function(scope) // parse a token stream..
 212     {
 213         //this.timerPrint("parseScope EnterScope");
 214         //this.log(">>> ENTER SCOPE" + this.scopes.length);
 215         var symbol;
 216         var token;
 217
 218         var identifier;
 219
 220         var expressionBraceNesting = this.braceNesting + 0;
 221
 222         var parensNesting = 0;
 223
 224         var isObjectLitAr = [ false ];
 225         var isInObjectLitAr;
 226         this.scopes.push(scope);
 227
 228         var scopeIndent = '';
 229         this.scopes.forEach(function() {
 230             scopeIndent += '   ';
 231         });
 232         print(scopeIndent + ">> ENTER SCOPE");
 233
 234
 235
 236
 237         token = this.ts.lookTok(1);
 238         while (token) {
 239           //  this.timerPrint("parseScope AFTER lookT: " + token.toString());
 240             //this.dumpToken(token , this.scopes, this.braceNesting);
 241             //print('SCOPE:' + token.toString());
 242             //this.log(token.data);
 243             if (token.type == 'NAME') {
 244             //    print('*' + token.data);
 245             }
 246             switch(token.type + '.' + token.name) {
 247                 case "KEYW.VAR":
 248                 case "KEYW.CONST": // not really relivant as it's only mozzy that does this.
 249
 250                     var vstart = this.ts.cursor;
 251
 252                     //this.log("parseScope GOT VAR/CONST : " + token.toString());
 253                     while (true) {
 254                         token = this.ts.nextTok();
 255                         !this.debug|| print( token.toString());
 256
 257                         if (!token) { // can return false at EOF!
 258                             break;
 259                         }
 260                         if (token.name == "VAR" || token.data == ',') { // kludge..
 261                             continue;
 262                         }
 263                         //this.logR("parseScope GOT VAR  : <B>" + token.toString() + "</B>");
 264                         if (token.type !="NAME") {
 265                             for(var i = Math.max(this.ts.cursor-10,0); i < this.ts.cursor+1; i++) {
 266                                 print(this.ts.tokens[i].toString());
 267                             }
 268
 269                             print( "var without ident");
 270                             Seed.quit()
 271                         }
 272
 273
 274                         if (this.mode == "BUILDING_SYMBOL_TREE") {
 275                             identifier = scope.getIdentifier(token.data) ;
 276
 277                             if (identifier == false) {
 278                                 scope.declareIdentifier(token.data, token);
 279                             } else {
 280                                 token.identifier = identifier;
 281                                 this.warn("(SCOPE) The variable " + token.data  + ' (line:' + token.line + ")  has already been declared in the same scope...");
 282                             }
 283                         }
 284
 285                         token = this.ts.nextTok();
 286                         !this.debug|| print(token.toString());
 287                         /*
 288                         assert token.getType() == Token.SEMI ||
 289                                 token.getType() == Token.ASSIGN ||
 290                                 token.getType() == Token.COMMA ||
 291                                 token.getType() == Token.IN;
 292                         */
 293                         if (token.name == "IN") {
 294                             break;
 295                         } else {
 296                             //var bn = this.braceNesting;
 297                             var bn = this.braceNesting;
 298                             this.parseExpression();
 299                             this.braceNesting = bn;
 300                             //this.braceNesting = bn;
 301                             //this.logR("parseScope DONE  : <B>ParseExpression</B> - tok is:" + this.ts.lookT(0).toString());
 302
 303                             token = this.ts.lookTok(1);
 304                             !this.debug|| print("AFTER EXP: " + token.toString());
 305                             if (token.data == ';') {
 306                                 break;
 307                             }
 308                         }
 309                     }
 310
 311
 312                     this.ts.dump(vstart , this.ts.cursor);
 313
 314                     break;
 315                 case "KEYW.FUNCTION":
 316                     //println("<i>"+token.data+"</i>");
 317                      var bn = this.braceNesting;
 318                     this.parseFunctionDeclaration();
 319                      this.braceNesting = bn;
 320                     break;
 321
 322                 case "PUNC.LEFT_CURLY": // {
 323                     //println("<i>"+token.data+"</i>");
 324                     isObjectLitAr.push(false);
 325                     this.braceNesting++;
 326
 327                     //print(">>>>>> OBJLIT PUSH(false)" + this.braceNesting);
 328                     break;
 329
 330                 case "PUNC.RIGHT_CURLY": // }
 331                     //println("<i>"+token.data+"</i>");
 332                     this.braceNesting--;
 333                     isObjectLitAr.pop();
 334                     //print(">>>>>> OBJLIT POP"+ this.braceNesting);
 335                         //assert braceNesting >= scope.getBra ceNesting();
 336
 337                     if (this.braceNesting < expressionBraceNesting) {
 338                         var ls = this.scopes.pop();
 339                         ls.getUsedSymbols();
 340                         // eat symbol if we are currently at {
 341                         if (this.ts.look(0).data == '{') {
 342                             this.ts.nextTok();
 343                         }
 344
 345                         print("<<<<<<<EXIT SCOPE" +this.scopes.length);
 346                         return;
 347                     }
 348                     break;
 349
 350                 case "KEYW.WITH":
 351                     //println("<i>"+token.data+"</i>");
 352                     if (this.mode == "BUILDING_SYMBOL_TREE") {
 353                         // Inside a 'with' block, it is impossible to figure out
 354                         // statically whether a symbol is a local variable or an
 355                         // object member. As a consequence, the only thing we can
 356                         // do is turn the obfuscation off for the highest scope
 357                         // containing the 'with' block.
 358                         this.protectScopeFromObfuscation(scope);
 359                         this.warn("Using 'with' is not recommended." + (this.munge ? " Moreover, using 'with' reduces the level of compression!" : ""), true);
 360                     }
 361                     break;
 362
 363                 case "KEYW.CATCH":
 364                     //println("<i>"+token.data+"</i>");
 365                     this.parseCatch();
 366                     break;
 367                 /*
 368                 case Token.SPECIALCOMMENT:
 369                         if (mode == BUILDING_SYMBOL_TREE) {
 370                             protectScopeFromObfuscation(scope);
 371                             this.warn("Using JScript conditional comments is not recommended." + (munge ? " Moreover, using JScript conditional comments reduces the level of compression." : ""), true);
 372                         }
 373                         break;
 374                 */
 375
 376                 case "STRN.DOUBLE_QUOTE": // used for object lit detection..
 377                 case "STRN.SINGLE_QUOTE":
 378                     //println("<i>"+token.data+"</i>");
 379                     if (this.ts.lookTok(-1).data == '{' && this.ts.lookTok(1).data == ':') {
 380                         // then we are in an object lit.. -> we need to flag the brace as such...
 381                         isObjectLitAr.pop();
 382                         isObjectLitAr.push(true);
 383                         //print(">>>>>> OBJLIT REPUSH(true)");
 384                     }
 385                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 386
 387                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ':' &&
 388                         ( this.ts.lookTok(-1).data == '{'  ||  this.ts.lookTok(-1).data == ':' )) {
 389                         // see if we can replace..
 390                         // remove the quotes..
 391                         // should do a bit more checking!!!! (what about wierd char's in the string..
 392                         var str = token.data.substring(1,token.data.length-1);
 393                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 394                             token.outData = str;
 395                         }
 396
 397
 398
 399                     }
 400
 401
 402
 403                     break;
 404
 405                 case "NAME.NAME":
 406
 407                     //print("DEAL WITH NAME:");
 408                     // got identifier..
 409
 410                     // look for  { ** : <- indicates obj literal.. ** this could occur with numbers ..
 411                     if ((this.ts.lookTok(-1).data == "{") && (this.ts.lookTok(1).data == ":")) {
 412                         isObjectLitAr.pop();
 413                         isObjectLitAr.push(true);
 414                         //print(">>>>>> OBJLIT REPUSH(true)");
 415                         //println("<i>"+token.data+"</i>");
 416                         break;
 417                     }
 418                    // print("DEAL WITH obj lit:");
 419                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 420
 421                     if (isInObjectLitAr && (this.ts.lookTok(1).data == ":") && (this.ts.lookTok(-1).data == ",")) {
 422                         // skip, it's an object lit key..
 423                         //println("<i>"+token.data+"</i>");
 424                         break;
 425                     }
 426
 427
 428                     // skip anyting with "." before it..!!
 429
 430                     if (this.ts.lookTok(-1).data == ".") {
 431                         // skip, it's an object prop.
 432                         //println("<i>"+token.data+"</i>");
 433                         break;
 434                     }
 435                     symbol = token.data;
 436                     if (this.mode == 'PASS2_SYMBOL_TREE') {
 437
 438                         //println("GOT IDENT: -2 : " + this.ts.lookT(-2).toString() + " <BR> ..... -1 :  " +  this.ts.lookT(-1).toString() + " <BR> ");
 439
 440                         //print ("MUNGE?" + symbol);
 441
 442                         //println("GOT IDENT: <B>" + symbol + "</B><BR/>");
 443
 444                             //println("GOT IDENT (2): <B>" + symbol + "</B><BR/>");
 445                         identifier = this.getIdentifier(symbol, scope);
 446
 447                         if (identifier == false) {
 448 // BUG!find out where builtin is defined...
 449                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 450                                 // Here, we found an undeclared and un-namespaced symbol that is
 451                                 // 3 characters or less in length. Declare it in the global scope.
 452                                 // We don't need to declare longer symbols since they won't cause
 453                                 // any conflict with other munged symbols.
 454                                 this.globalScope.declareIdentifier(symbol, token);
 455                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 456                             }
 457
 458                             //println("GOT IDENT IGNORE(3): <B>" + symbol + "</B><BR/>");
 459                         } else {
 460                             token.identifier = identifier;
 461                             identifier.refcount++;
 462                         }
 463                     }
 464
 465                     break;
 466                     //println("<B>SID</B>");
 467                 default:
 468                     if (token.type != 'KEYW') {
 469                         break;
 470                     }
 471                    // print("Check eval:");
 472
 473                     symbol = token.data;
 474
 475                      if (this.mode == 'BUILDING_SYMBOL_TREE') {
 476
 477                         if (symbol == "eval") {
 478                             // look back one and see if we can find a comment!!!
 479                             if (this.ts.look(-1).type == "COMM") {
 480                                 // look for eval:var:noreplace\n
 481                                 var _t = this;
 482                                 this.ts.look(-1).data.replace(/eval:var:([a-z_]+)/ig, function(m, a) {
 483
 484                                     var hi = _t.getIdentifier(a, scope);
 485                                    // println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 486                                     if (hi) {
 487                                      //   println("PROTECT "+a+" from munge");
 488                                         hi.toMunge = false;
 489                                     }
 490
 491                                 });
 492
 493
 494                             } else {
 495
 496
 497                                 this.protectScopeFromObfuscation(scope);
 498                                 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);
 499                             }
 500
 501                         }
 502
 503                     }
 504                     break;
 505
 506
 507             } // end switch
 508
 509
 510             //print("parseScope TOK : " + token.toString());
 511             token = this.ts.nextTok();
 512             //if (this.ts.nextT()) break;
 513
 514         }
 515         //print("<<<<<<<EXIT SCOPE ERR?" +this.scopes.length);
 516     },
 517
 518     expN : 0,
 519     parseExpression : function() {
 520
 521         // Parse the expression until we encounter a comma or a semi-colon
 522         // in the same brace nesting, bracket nesting and paren nesting.
 523         // Parse functions if any...
 524         //println("<i>EXP</i><BR/>");
 525         !this.debug || print("PARSE EXPR");
 526         this.expN++;
 527
 528         // for printing stuff..
 529
 530
 531
 532         var symbol;
 533         var token;
 534         var currentScope;
 535         var identifier;
 536
 537         var expressionBraceNesting = this.braceNesting + 0;
 538         var bracketNesting = 0;
 539         var parensNesting = 0;
 540         var isInObjectLitAr;
 541         var isObjectLitAr = [ false ];
 542
 543         currentScope = this.scopes[this.scopes.length-1];
 544
 545         var scopeIndent = '';
 546         this.scopes.forEach(function() {
 547             scopeIndent += '   ';
 548         });
 549         print(scopeIndent + ">> ENTER EXPRESSION" + this.expN);
 550         while (token = this.ts.lookTok()) {
 551
 552
 553
 554            /*
 555             // moved out of loop?
 556            currentScope = this.scopes[this.scopes.length-1];
 557
 558             var scopeIndent = '';
 559             this.scopes.forEach(function() {
 560                 scopeIndent += '   ';
 561             });
 562            */
 563
 564            //this.dumpToken(token,  this.scopes, this.braceNesting );
 565            print('EXP' + this.expN + ':' + token.toString());
 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                                 this.expN--;
 581                                 return;
 582                             }
 583                             break;
 584
 585
 586
 587                         case '{': //Token.LC:
 588                             isObjectLitAr.push(false);
 589
 590                             this.braceNesting++;
 591                             ///print(">>>>> EXP PUSH(false)"+this.braceNesting);
 592                             break;
 593
 594                         case '}': //Token.RC:
 595                             this.braceNesting--;
 596                             isObjectLitAr.pop();
 597                             //print(">>>>> EXP POP" + this.braceNesting);
 598                            // assert braceNesting >= expressionBraceNesting;
 599                             break;
 600
 601                         case '[': //Token.LB:
 602                             bracketNesting++;
 603                             break;
 604
 605                         case ']': //Token.RB:
 606                             bracketNesting--;
 607                             break;
 608
 609                         case '(': //Token.LP:
 610                             parensNesting++;
 611                             break;
 612
 613                         case ')': //Token.RP:
 614                             parensNesting--;
 615                             break;
 616                     }
 617                     break;
 618
 619                 case 'STRN': // used for object lit detection..
 620                     if (this.ts.lookTok(-1).data == "{" && this.ts.lookTok(1).data == ":" ) {
 621                         // then we are in an object lit.. -> we need to flag the brace as such...
 622                         isObjectLitAr.pop();
 623                         isObjectLitAr.push(true);
 624                         //print(">>>>> EXP PUSH(true)");
 625                     }
 626
 627
 628
 629                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 630                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ":"  &&
 631                         ( this.ts.lookTok(-1).data == "{"  ||  this.ts.lookTok(-1).data == "," )) {
 632                         // see if we can replace..
 633                         // remove the quotes..
 634                         var str = token.data.substring(1,token.data.length-1);
 635                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 636                             token.outData = str;
 637                         }
 638
 639
 640
 641                     }
 642
 643                     break;
 644
 645
 646
 647                 case 'NAME':
 648
 649                     symbol = token.data;
 650                     //print("in NAME = " + token.toString());
 651                     //print("in NAME 0: " + this.ts.look(0).toString());
 652                     //print("in NAME 2: " + this.ts.lookTok(2).toString());
 653                     if (this.ts.look(0).data == "{"  && this.ts.lookTok(2).data == ":") {
 654                         // then we are in an object lit.. -> we need to flag the brace as such...
 655                         isObjectLitAr.pop();
 656                         isObjectLitAr.push(true);
 657                          //print(">>>>> EXP  PUSH(true)");
 658                         break;
 659                     }
 660
 661                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 662                     //print ("isInObjectLitAr : " + isInObjectLitAr + ' ' + token.toString());
 663
 664                     if (isInObjectLitAr && this.ts.lookTok(0).data == "," && this.ts.lookTok(2).data == ":") {
 665                         break;
 666                     }
 667                     //print(this.ts.lookTok(0).data);
 668                     if (this.ts.lookTok(0).data == ".") {
 669                         //skip '.'
 670                         break;
 671                     }
 672
 673                      if (this.mode == 'PASS2_SYMBOL_TREE') {
 674
 675                         identifier = this.getIdentifier(symbol, currentScope);
 676                         //println("<B>??</B>");
 677                         if (identifier == false) {
 678
 679                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 680                                 // Here, we found an undeclared and un-namespaced symbol that is
 681                                 // 3 characters or less in length. Declare it in the global scope.
 682                                 // We don't need to declare longer symbols since they won't cause
 683                                 // any conflict with other munged symbols.
 684                                 this.globalScope.declareIdentifier(symbol, token);
 685                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 686                             } else {
 687                                 //println("undeclared")
 688                             }
 689
 690
 691                         } else {
 692                             //println("<B>++</B>");
 693                             token.identifier = identifier;
 694                             identifier.refcount++;
 695                         }
 696
 697                     }
 698                     break;
 699
 700
 701
 702
 703                     //println("<B>EID</B>");
 704                  case 'KEYW':
 705
 706                     if (token.name == "FUNCTION") {
 707
 708                         this.parseFunctionDeclaration();
 709                         break;
 710                     }
 711
 712
 713
 714                     symbol = token.data;
 715                     if (this.mode == 'BUILDING_SYMBOL_TREE') {
 716
 717                         if (symbol == "eval") {
 718                             if (this.ts.look(-1).type == 'COMM') {
 719                                 // look for eval:var:noreplace\n
 720                                 var _t = this;
 721                                 this.ts.look(-1).data.replace(/eval:var:([a-z]+)/ig, function(m, a) {
 722                                     var hi = _t.getIdentifier(a, currentScope);
 723                                    //println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 724                                     if (hi) {
 725                                       //  println("PROTECT "+a+" from munge");
 726                                         hi.toMunge = false;
 727                                     }
 728
 729
 730                                 });
 731
 732                             } else {
 733                                 this.protectScopeFromObfuscation(currentScope);
 734                                 this.warn("Using 'eval' is not recommended." + (this.munge ? " Moreover, using 'eval' reduces the level of compression!" : ""), true);
 735                             }
 736
 737
 738                         }
 739                         break;
 740                     }
 741
 742             }
 743             if (!this.ts.nextTok()) break;
 744         }
 745         print(scopeIndent + "<< EXIT EXPRESSION");
 746         this.expN--;
 747     },
 748
 749
 750     parseCatch : function() {
 751
 752         var symbol;
 753         var token;
 754         var currentScope;
 755         var identifier;
 756
 757         //token = getToken(-1);
 758         //assert token.getType() == Token.CATCH;
 759         token = this.ts.nextTok();
 760         //assert token.getType() == Token.LP; (
 761         token = this.ts.nextTok();
 762         //assert token.getType() == Token.NAME;
 763
 764         symbol = token.data;
 765         currentScope = this.scopes[this.scopes.length-1];
 766
 767         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 768             // We must declare the exception identifier in the containing function
 769             // scope to avoid errors related to the obfuscation process. No need to
 770             // display a warning if the symbol was already declared here...
 771             currentScope.declareIdentifier(symbol, token);
 772         } else {
 773             //?? why inc the refcount?? - that should be set when building the tree???
 774             identifier = this.getIdentifier(symbol, currentScope);
 775             identifier.refcount++;
 776         }
 777
 778         token = this.ts.nextTok();
 779         //assert token.getType() == Token.RP; // )
 780     },
 781
 782     parseFunctionDeclaration : function()
 783     {
 784         print("PARSE FUNCTION");
 785         var symbol;
 786         var token;
 787         var currentScope  = false;
 788         var fnScope = false;
 789         var identifier;
 790         var b4braceNesting = this.braceNesting + 0;
 791
 792         //this.logR("<B>PARSING FUNCTION</B>");
 793         currentScope = this.scopes[this.scopes.length-1];
 794
 795         token = this.ts.nextTok();
 796         if (token.type == "NAME") {
 797             if (this.mode == 'BUILDING_SYMBOL_TREE') {
 798                 // Get the name of the function and declare it in the current scope.
 799                 symbol = token.data;
 800                 if (currentScope.getIdentifier(symbol) != false) {
 801                     this.warn("The function " + symbol + " has already been declared in the same scope...", true);
 802                 }
 803                 currentScope.declareIdentifier(symbol,token);
 804             }
 805             token =  this.ts.nextTok();
 806         }
 807
 808         //assert token.getType() == Token.LP;
 809         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 810             fnScope = new Scope(this.braceNesting, currentScope, token.n, '');
 811
 812             //println("STORING SCOPE" + this.ts.cursor);
 813
 814             this.indexedScopes[this.ts.cursor] = fnScope;
 815
 816         } else {
 817             //qln("FETCHING SCOPE" + this.ts.cursor);
 818             fnScope = this.indexedScopes[this.ts.cursor];
 819
 820         }
 821
 822         // Parse function arguments.
 823         var argpos = 0;
 824         while (this.ts.lookTok().data != ')') { //(token = consumeToken()).getType() != Token.RP) {
 825             token = this.ts.nextTok();
 826            // print ("FUNC ARGS: " + token.toString())
 827             //assert token.getType() == Token.NAME ||
 828             //        token.getType() == Token.COMMA;
 829             if (token.type == 'NAME' && this.mode == 'BUILDING_SYMBOL_TREE') {
 830                 symbol = token.data;
 831                 identifier = fnScope.declareIdentifier(symbol,token);
 832                 if (symbol == "$super" && argpos == 0) {
 833                     // Exception for Prototype 1.6...
 834                     identifier.preventMunging();
 835                 }
 836                 argpos++;
 837             }
 838         }
 839
 840         token = this.ts.nextTok();
 841         print(token.toString());
 842         // assert token.getType() == Token.LC;
 843         this.braceNesting++;
 844
 845         token = this.ts.nextTok();
 846         print(token.toString());
 847         if (token.type == "STRN" && this.ts.lookTok(1).data == ';') {
 848             /*
 849
 850             NOT SUPPORTED YET!?!!?!
 851
 852             // This is a hint. Hints are empty statements that look like
 853             // "localvar1:nomunge, localvar2:nomunge"; They allow developers
 854             // to prevent specific symbols from getting obfuscated (some heretic
 855             // implementations, such as Prototype 1.6, require specific variable
 856             // names, such as $super for example, in order to work appropriately.
 857             // Note: right now, only "nomunge" is supported in the right hand side
 858             // of a hint. However, in the future, the right hand side may contain
 859             // other values.
 860             consumeToken();
 861             String hints = token.getValue();
 862             // Remove the leading and trailing quotes...
 863             hints = hints.substring(1, hints.length() - 1).trim();
 864             StringTokenizer st1 = new StringTokenizer(hints, ",");
 865             while (st1.hasMoreTokens()) {
 866                 String hint = st1.nextToken();
 867                 int idx = hint.indexOf(':');
 868                 if (idx <= 0 || idx >= hint.length() - 1) {
 869                     if (mode == BUILDING_SYMBOL_TREE) {
 870                         // No need to report the error twice, hence the test...
 871                         this.warn("Invalid hint syntax: " + hint, true);
 872                     }
 873                     break;
 874                 }
 875                 String variableName = hint.substring(0, idx).trim();
 876                 String variableType = hint.substring(idx + 1).trim();
 877                 if (mode == BUILDING_SYMBOL_TREE) {
 878                     fnScope.addHint(variableName, variableType);
 879                 } else if (mode == CHECKING_SYMBOL_TREE) {
 880                     identifier = fnScope.getIdentifier(variableName);
 881                     if (identifier != null) {
 882                         if (variableType.equals("nomunge")) {
 883                             identifier.preventMunging();
 884                         } else {
 885                             this.warn("Unsupported hint value: " + hint, true);
 886                         }
 887                     } else {
 888                         this.warn("Hint refers to an unknown identifier: " + hint, true);
 889                     }
 890                 }
 891             }
 892             */
 893         }
 894
 895         this.parseScope(fnScope);
 896         // now pop it off the stack!!!
 897
 898         this.braceNesting = b4braceNesting;
 899         print("ENDFN -1: " + this.ts.lookTok(-1).toString());
 900         print("ENDFN 0: " + this.ts.lookTok(0).toString());
 901         print("ENDFN 1: " + this.ts.lookTok(1).toString());
 902     },
 903
 904     protectScopeFromObfuscation : function(scope) {
 905             //assert scope != null;
 906
 907         if (scope == this.globalScope) {
 908             // The global scope does not get obfuscated,
 909             // so we don't need to worry about it...
 910             return;
 911         }
 912
 913         // Find the highest local scope containing the specified scope.
 914         while (scope && scope.parent != this.globalScope) {
 915             scope = scope.parent;
 916         }
 917
 918         //assert scope.getParentScope() == globalScope;
 919         scope.preventMunging();
 920     },
 921
 922     getIdentifier: function(symbol, scope) {
 923         var identifier;
 924         while (scope != false) {
 925             identifier = scope.getIdentifier(symbol);
 926             //println("ScopeParser.getIdentgetUsedSymbols("+symbol+")=" + scope.getUsedSymbols().join(','));
 927             if (identifier) {
 928                 return identifier;
 929             }
 930             scope = scope.parent;
 931         }
 932         return false;
 933     }
 934 };