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
 251                     //this.log("parseScope GOT VAR/CONST : " + token.toString());
 252                     while (true) {
 253                         token = this.ts.nextTok();
 254                         !this.debug|| print( token.toString());
 255
 256                         if (!token) { // can return false at EOF!
 257                             break;
 258                         }
 259                         if (token.name == "VAR" || token.data == ',') { // kludge..
 260                             continue;
 261                         }
 262                         //this.logR("parseScope GOT VAR  : <B>" + token.toString() + "</B>");
 263                         if (token.type !="NAME") {
 264                             for(var i = Math.max(this.ts.cursor-10,0); i < this.ts.cursor+1; i++) {
 265                                 print(this.ts.tokens[i].toString());
 266                             }
 267
 268                             print( "var without ident");
 269                             Seed.quit()
 270                         }
 271
 272
 273                         if (this.mode == "BUILDING_SYMBOL_TREE") {
 274                             identifier = scope.getIdentifier(token.data) ;
 275
 276                             if (identifier == false) {
 277                                 scope.declareIdentifier(token.data, token);
 278                             } else {
 279                                 token.identifier = identifier;
 280                                 this.warn("(SCOPE) The variable " + token.data  + ' (line:' + token.line + ")  has already been declared in the same scope...");
 281                             }
 282                         }
 283
 284                         token = this.ts.nextTok();
 285                         !this.debug|| print(token.toString());
 286                         /*
 287                         assert token.getType() == Token.SEMI ||
 288                                 token.getType() == Token.ASSIGN ||
 289                                 token.getType() == Token.COMMA ||
 290                                 token.getType() == Token.IN;
 291                         */
 292                         if (token.name == "IN") {
 293                             break;
 294                         } else {
 295                             //var bn = this.braceNesting;
 296                             var bn = this.braceNesting;
 297                             this.parseExpression();
 298                             this.braceNesting = bn;
 299                             //this.braceNesting = bn;
 300                             //this.logR("parseScope DONE  : <B>ParseExpression</B> - tok is:" + this.ts.lookT(0).toString());
 301
 302                             token = this.ts.lookTok(1);
 303                             !this.debug|| print("AFTER EXP: " + token.toString());
 304                             if (token.data == ';') {
 305                                 break;
 306                             }
 307                         }
 308                     }
 309                     break;
 310                 case "KEYW.FUNCTION":
 311                     //println("<i>"+token.data+"</i>");
 312                      var bn = this.braceNesting;
 313                     this.parseFunctionDeclaration();
 314                      this.braceNesting = bn;
 315                     break;
 316
 317                 case "PUNC.LEFT_CURLY": // {
 318                     //println("<i>"+token.data+"</i>");
 319                     isObjectLitAr.push(false);
 320                     this.braceNesting++;
 321
 322                     //print(">>>>>> OBJLIT PUSH(false)" + this.braceNesting);
 323                     break;
 324
 325                 case "PUNC.RIGHT_CURLY": // }
 326                     //println("<i>"+token.data+"</i>");
 327                     this.braceNesting--;
 328                     isObjectLitAr.pop();
 329                     //print(">>>>>> OBJLIT POP"+ this.braceNesting);
 330                         //assert braceNesting >= scope.getBra ceNesting();
 331
 332                     if (this.braceNesting < expressionBraceNesting) {
 333                         var ls = this.scopes.pop();
 334                         ls.getUsedSymbols();
 335                         // eat symbol if we are currently at {
 336                         if (this.ts.look(0).data == '{') {
 337                             this.ts.nextTok();
 338                         }
 339
 340                         print("<<<<<<<EXIT SCOPE" +this.scopes.length);
 341                         return;
 342                     }
 343                     break;
 344
 345                 case "KEYW.WITH":
 346                     //println("<i>"+token.data+"</i>");
 347                     if (this.mode == "BUILDING_SYMBOL_TREE") {
 348                         // Inside a 'with' block, it is impossible to figure out
 349                         // statically whether a symbol is a local variable or an
 350                         // object member. As a consequence, the only thing we can
 351                         // do is turn the obfuscation off for the highest scope
 352                         // containing the 'with' block.
 353                         this.protectScopeFromObfuscation(scope);
 354                         this.warn("Using 'with' is not recommended." + (this.munge ? " Moreover, using 'with' reduces the level of compression!" : ""), true);
 355                     }
 356                     break;
 357
 358                 case "KEYW.CATCH":
 359                     //println("<i>"+token.data+"</i>");
 360                     this.parseCatch();
 361                     break;
 362                 /*
 363                 case Token.SPECIALCOMMENT:
 364                         if (mode == BUILDING_SYMBOL_TREE) {
 365                             protectScopeFromObfuscation(scope);
 366                             this.warn("Using JScript conditional comments is not recommended." + (munge ? " Moreover, using JScript conditional comments reduces the level of compression." : ""), true);
 367                         }
 368                         break;
 369                 */
 370
 371                 case "STRN.DOUBLE_QUOTE": // used for object lit detection..
 372                 case "STRN.SINGLE_QUOTE":
 373                     //println("<i>"+token.data+"</i>");
 374                     if (this.ts.lookTok(-1).data == '{' && this.ts.lookTok(1).data == ':') {
 375                         // then we are in an object lit.. -> we need to flag the brace as such...
 376                         isObjectLitAr.pop();
 377                         isObjectLitAr.push(true);
 378                         //print(">>>>>> OBJLIT REPUSH(true)");
 379                     }
 380                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 381
 382                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ':' &&
 383                         ( this.ts.lookTok(-1).data == '{'  ||  this.ts.lookTok(-1).data == ':' )) {
 384                         // see if we can replace..
 385                         // remove the quotes..
 386                         // should do a bit more checking!!!! (what about wierd char's in the string..
 387                         var str = token.data.substring(1,token.data.length-1);
 388                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 389                             token.outData = str;
 390                         }
 391
 392
 393
 394                     }
 395
 396
 397
 398                     break;
 399
 400                 case "NAME.NAME":
 401
 402                     //print("DEAL WITH NAME:");
 403                     // got identifier..
 404
 405                     // look for  { ** : <- indicates obj literal.. ** this could occur with numbers ..
 406                     if ((this.ts.lookTok(-1).data == "{") && (this.ts.lookTok(1).data == ":")) {
 407                         isObjectLitAr.pop();
 408                         isObjectLitAr.push(true);
 409                         //print(">>>>>> OBJLIT REPUSH(true)");
 410                         //println("<i>"+token.data+"</i>");
 411                         break;
 412                     }
 413                    // print("DEAL WITH obj lit:");
 414                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 415
 416                     if (isInObjectLitAr && (this.ts.lookTok(1).data == ":") && (this.ts.lookTok(-1).data == ",")) {
 417                         // skip, it's an object lit key..
 418                         //println("<i>"+token.data+"</i>");
 419                         break;
 420                     }
 421
 422
 423                     // skip anyting with "." before it..!!
 424
 425                     if (this.ts.lookTok(-1).data == ".") {
 426                         // skip, it's an object prop.
 427                         //println("<i>"+token.data+"</i>");
 428                         break;
 429                     }
 430                     symbol = token.data;
 431                     if (this.mode == 'PASS2_SYMBOL_TREE') {
 432
 433                         //println("GOT IDENT: -2 : " + this.ts.lookT(-2).toString() + " <BR> ..... -1 :  " +  this.ts.lookT(-1).toString() + " <BR> ");
 434
 435                         //print ("MUNGE?" + symbol);
 436
 437                         //println("GOT IDENT: <B>" + symbol + "</B><BR/>");
 438
 439                             //println("GOT IDENT (2): <B>" + symbol + "</B><BR/>");
 440                         identifier = this.getIdentifier(symbol, scope);
 441
 442                         if (identifier == false) {
 443 // BUG!find out where builtin is defined...
 444                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 445                                 // Here, we found an undeclared and un-namespaced symbol that is
 446                                 // 3 characters or less in length. Declare it in the global scope.
 447                                 // We don't need to declare longer symbols since they won't cause
 448                                 // any conflict with other munged symbols.
 449                                 this.globalScope.declareIdentifier(symbol, token);
 450                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 451                             }
 452
 453                             //println("GOT IDENT IGNORE(3): <B>" + symbol + "</B><BR/>");
 454                         } else {
 455                             token.identifier = identifier;
 456                             identifier.refcount++;
 457                         }
 458                     }
 459
 460                     break;
 461                     //println("<B>SID</B>");
 462                 default:
 463                     if (token.type != 'KEYW') {
 464                         break;
 465                     }
 466                    // print("Check eval:");
 467
 468                     symbol = token.data;
 469
 470                      if (this.mode == 'BUILDING_SYMBOL_TREE') {
 471
 472                         if (symbol == "eval") {
 473                             // look back one and see if we can find a comment!!!
 474                             if (this.ts.look(-1).type == "COMM") {
 475                                 // look for eval:var:noreplace\n
 476                                 var _t = this;
 477                                 this.ts.look(-1).data.replace(/eval:var:([a-z_]+)/ig, function(m, a) {
 478
 479                                     var hi = _t.getIdentifier(a, scope);
 480                                    // println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 481                                     if (hi) {
 482                                      //   println("PROTECT "+a+" from munge");
 483                                         hi.toMunge = false;
 484                                     }
 485
 486                                 });
 487
 488
 489                             } else {
 490
 491
 492                                 this.protectScopeFromObfuscation(scope);
 493                                 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);
 494                             }
 495
 496                         }
 497
 498                     }
 499                     break;
 500
 501
 502             } // end switch
 503
 504
 505             //print("parseScope TOK : " + token.toString());
 506             token = this.ts.nextTok();
 507             //if (this.ts.nextT()) break;
 508
 509         }
 510         //print("<<<<<<<EXIT SCOPE ERR?" +this.scopes.length);
 511     },
 512
 513     expN : 0,
 514     parseExpression : function() {
 515
 516         // Parse the expression until we encounter a comma or a semi-colon
 517         // in the same brace nesting, bracket nesting and paren nesting.
 518         // Parse functions if any...
 519         //println("<i>EXP</i><BR/>");
 520         !this.debug || print("PARSE EXPR");
 521         this.expN++;
 522
 523         // for printing stuff..
 524
 525
 526
 527         var symbol;
 528         var token;
 529         var currentScope;
 530         var identifier;
 531
 532         var expressionBraceNesting = this.braceNesting + 0;
 533         var bracketNesting = 0;
 534         var parensNesting = 0;
 535         var isInObjectLitAr;
 536         var isObjectLitAr = [ false ];
 537
 538         currentScope = this.scopes[this.scopes.length-1];
 539
 540         var scopeIndent = '';
 541         this.scopes.forEach(function() {
 542             scopeIndent += '   ';
 543         });
 544         print(scopeIndent + ">> ENTER EXPRESSION" + this.expN);
 545         while (token = this.ts.lookTok()) {
 546
 547
 548
 549            /*
 550             // moved out of loop?
 551            currentScope = this.scopes[this.scopes.length-1];
 552
 553             var scopeIndent = '';
 554             this.scopes.forEach(function() {
 555                 scopeIndent += '   ';
 556             });
 557            */
 558
 559            //this.dumpToken(token,  this.scopes, this.braceNesting );
 560            print('EXP' + this.expN + ':' + token.toString());
 561
 562
 563             //println("<i>"+token.data+"</i>");
 564             //this.log("EXP:" + token.data);
 565             switch (token.type) {
 566                 case 'PUNC':
 567                     switch(token.data) {
 568
 569                         case ';':
 570                         case ',':
 571                             if (this.braceNesting == expressionBraceNesting &&
 572                                     bracketNesting == 0 &&
 573                                     parensNesting == 0) {
 574                                 print(scopeIndent + "<< EXIT EXPRESSION");
 575                                 this.expN--;
 576                                 return;
 577                             }
 578                             break;
 579
 580
 581
 582                         case '{': //Token.LC:
 583                             isObjectLitAr.push(false);
 584
 585                             this.braceNesting++;
 586                             ///print(">>>>> EXP PUSH(false)"+this.braceNesting);
 587                             break;
 588
 589                         case '}': //Token.RC:
 590                             this.braceNesting--;
 591                             isObjectLitAr.pop();
 592                             //print(">>>>> EXP POP" + this.braceNesting);
 593                            // assert braceNesting >= expressionBraceNesting;
 594                             break;
 595
 596                         case '[': //Token.LB:
 597                             bracketNesting++;
 598                             break;
 599
 600                         case ']': //Token.RB:
 601                             bracketNesting--;
 602                             break;
 603
 604                         case '(': //Token.LP:
 605                             parensNesting++;
 606                             break;
 607
 608                         case ')': //Token.RP:
 609                             parensNesting--;
 610                             break;
 611                     }
 612                     break;
 613
 614                 case 'STRN': // used for object lit detection..
 615                     if (this.ts.lookTok(-1).data == "{" && this.ts.lookTok(1).data == ":" ) {
 616                         // then we are in an object lit.. -> we need to flag the brace as such...
 617                         isObjectLitAr.pop();
 618                         isObjectLitAr.push(true);
 619                         //print(">>>>> EXP PUSH(true)");
 620                     }
 621
 622
 623
 624                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 625                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ":"  &&
 626                         ( this.ts.lookTok(-1).data == "{"  ||  this.ts.lookTok(-1).data == "," )) {
 627                         // see if we can replace..
 628                         // remove the quotes..
 629                         var str = token.data.substring(1,token.data.length-1);
 630                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 631                             token.outData = str;
 632                         }
 633
 634
 635
 636                     }
 637
 638                     break;
 639
 640
 641
 642                 case 'NAME':
 643
 644                     symbol = token.data;
 645                     //print("in NAME = " + token.toString());
 646                     //print("in NAME 0: " + this.ts.look(0).toString());
 647                     //print("in NAME 2: " + this.ts.lookTok(2).toString());
 648                     if (this.ts.look(0).data == "{"  && this.ts.lookTok(2).data == ":") {
 649                         // then we are in an object lit.. -> we need to flag the brace as such...
 650                         isObjectLitAr.pop();
 651                         isObjectLitAr.push(true);
 652                          //print(">>>>> EXP  PUSH(true)");
 653                         break;
 654                     }
 655
 656                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 657                     //print ("isInObjectLitAr : " + isInObjectLitAr + ' ' + token.toString());
 658
 659                     if (isInObjectLitAr && this.ts.lookTok(0).data == "," && this.ts.lookTok(2).data == ":") {
 660                         break;
 661                     }
 662                     //print(this.ts.lookTok(0).data);
 663                     if (this.ts.lookTok(0).data == ".") {
 664                         //skip '.'
 665                         break;
 666                     }
 667
 668                      if (this.mode == 'PASS2_SYMBOL_TREE') {
 669
 670                         identifier = this.getIdentifier(symbol, currentScope);
 671                         //println("<B>??</B>");
 672                         if (identifier == false) {
 673
 674                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 675                                 // Here, we found an undeclared and un-namespaced symbol that is
 676                                 // 3 characters or less in length. Declare it in the global scope.
 677                                 // We don't need to declare longer symbols since they won't cause
 678                                 // any conflict with other munged symbols.
 679                                 this.globalScope.declareIdentifier(symbol, token);
 680                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 681                             } else {
 682                                 //println("undeclared")
 683                             }
 684
 685
 686                         } else {
 687                             //println("<B>++</B>");
 688                             token.identifier = identifier;
 689                             identifier.refcount++;
 690                         }
 691
 692                     }
 693                     break;
 694
 695
 696
 697
 698                     //println("<B>EID</B>");
 699                  case 'KEYW':
 700
 701                     if (token.name == "FUNCTION") {
 702
 703                         this.parseFunctionDeclaration();
 704                         break;
 705                     }
 706
 707
 708
 709                     symbol = token.data;
 710                     if (this.mode == 'BUILDING_SYMBOL_TREE') {
 711
 712                         if (symbol == "eval") {
 713                             if (this.ts.look(-1).type == 'COMM') {
 714                                 // look for eval:var:noreplace\n
 715                                 var _t = this;
 716                                 this.ts.look(-1).data.replace(/eval:var:([a-z]+)/ig, function(m, a) {
 717                                     var hi = _t.getIdentifier(a, currentScope);
 718                                    //println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 719                                     if (hi) {
 720                                       //  println("PROTECT "+a+" from munge");
 721                                         hi.toMunge = false;
 722                                     }
 723
 724
 725                                 });
 726
 727                             } else {
 728                                 this.protectScopeFromObfuscation(currentScope);
 729                                 this.warn("Using 'eval' is not recommended." + (this.munge ? " Moreover, using 'eval' reduces the level of compression!" : ""), true);
 730                             }
 731
 732
 733                         }
 734                         break;
 735                     }
 736
 737             }
 738             if (!this.ts.nextTok()) break;
 739         }
 740         print(scopeIndent + "<< EXIT EXPRESSION");
 741         this.expN--;
 742     },
 743
 744
 745     parseCatch : function() {
 746
 747         var symbol;
 748         var token;
 749         var currentScope;
 750         var identifier;
 751
 752         //token = getToken(-1);
 753         //assert token.getType() == Token.CATCH;
 754         token = this.ts.nextTok();
 755         //assert token.getType() == Token.LP; (
 756         token = this.ts.nextTok();
 757         //assert token.getType() == Token.NAME;
 758
 759         symbol = token.data;
 760         currentScope = this.scopes[this.scopes.length-1];
 761
 762         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 763             // We must declare the exception identifier in the containing function
 764             // scope to avoid errors related to the obfuscation process. No need to
 765             // display a warning if the symbol was already declared here...
 766             currentScope.declareIdentifier(symbol, token);
 767         } else {
 768             //?? why inc the refcount?? - that should be set when building the tree???
 769             identifier = this.getIdentifier(symbol, currentScope);
 770             identifier.refcount++;
 771         }
 772
 773         token = this.ts.nextTok();
 774         //assert token.getType() == Token.RP; // )
 775     },
 776
 777     parseFunctionDeclaration : function()
 778     {
 779         print("PARSE FUNCTION");
 780         var symbol;
 781         var token;
 782         var currentScope  = false;
 783         var fnScope = false;
 784         var identifier;
 785         var b4braceNesting = this.braceNesting + 0;
 786
 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         print(token.toString());
 837         // assert token.getType() == Token.LC;
 838         this.braceNesting++;
 839
 840         token = this.ts.nextTok();
 841         print(token.toString());
 842         if (token.type == "STRN" && this.ts.lookTok(1).data == ';') {
 843             /*
 844
 845             NOT SUPPORTED YET!?!!?!
 846
 847             // This is a hint. Hints are empty statements that look like
 848             // "localvar1:nomunge, localvar2:nomunge"; They allow developers
 849             // to prevent specific symbols from getting obfuscated (some heretic
 850             // implementations, such as Prototype 1.6, require specific variable
 851             // names, such as $super for example, in order to work appropriately.
 852             // Note: right now, only "nomunge" is supported in the right hand side
 853             // of a hint. However, in the future, the right hand side may contain
 854             // other values.
 855             consumeToken();
 856             String hints = token.getValue();
 857             // Remove the leading and trailing quotes...
 858             hints = hints.substring(1, hints.length() - 1).trim();
 859             StringTokenizer st1 = new StringTokenizer(hints, ",");
 860             while (st1.hasMoreTokens()) {
 861                 String hint = st1.nextToken();
 862                 int idx = hint.indexOf(':');
 863                 if (idx <= 0 || idx >= hint.length() - 1) {
 864                     if (mode == BUILDING_SYMBOL_TREE) {
 865                         // No need to report the error twice, hence the test...
 866                         this.warn("Invalid hint syntax: " + hint, true);
 867                     }
 868                     break;
 869                 }
 870                 String variableName = hint.substring(0, idx).trim();
 871                 String variableType = hint.substring(idx + 1).trim();
 872                 if (mode == BUILDING_SYMBOL_TREE) {
 873                     fnScope.addHint(variableName, variableType);
 874                 } else if (mode == CHECKING_SYMBOL_TREE) {
 875                     identifier = fnScope.getIdentifier(variableName);
 876                     if (identifier != null) {
 877                         if (variableType.equals("nomunge")) {
 878                             identifier.preventMunging();
 879                         } else {
 880                             this.warn("Unsupported hint value: " + hint, true);
 881                         }
 882                     } else {
 883                         this.warn("Hint refers to an unknown identifier: " + hint, true);
 884                     }
 885                 }
 886             }
 887             */
 888         }
 889
 890         this.parseScope(fnScope);
 891         // now pop it off the stack!!!
 892
 893         this.braceNesting = b4braceNesting;
 894         print("ENDFN -1: " + this.ts.lookTok(-1).toString());
 895         print("ENDFN 0: " + this.ts.lookTok(0).toString());
 896         print("ENDFN 1: " + this.ts.lookTok(1).toString());
 897     },
 898
 899     protectScopeFromObfuscation : function(scope) {
 900             //assert scope != null;
 901
 902         if (scope == this.globalScope) {
 903             // The global scope does not get obfuscated,
 904             // so we don't need to worry about it...
 905             return;
 906         }
 907
 908         // Find the highest local scope containing the specified scope.
 909         while (scope && scope.parent != this.globalScope) {
 910             scope = scope.parent;
 911         }
 912
 913         //assert scope.getParentScope() == globalScope;
 914         scope.preventMunging();
 915     },
 916
 917     getIdentifier: function(symbol, scope) {
 918         var identifier;
 919         while (scope != false) {
 920             identifier = scope.getIdentifier(symbol);
 921             //println("ScopeParser.getIdentgetUsedSymbols("+symbol+")=" + scope.getUsedSymbols().join(','));
 922             if (identifier) {
 923                 return identifier;
 924             }
 925             scope = scope.parent;
 926         }
 927         return false;
 928     }
 929 };