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             if (this.dumpLine.str.length > 80 || tok.data ==';') {
 205
 206                 print(
 207                 //    (new Array(this.dumpLine.scope)).join("  ") + '|' +
 208                     (new Array(this.dumpLine.brace+1)).join("  ") + this.dumpLine.str);
 209                 this.dumpLine.str = '';
 210             }
 211             return;
 212         }
 213
 214         print(
 215           //  (new Array(this.dumpLine.scope)).join("  ") + '|' +
 216             (new Array(this.dumpLine.brace+1)).join("  ") + this.dumpLine.str);
 217
 218
 219         this.dumpLine = {
 220             str : tok.data + ' ',
 221             scope : scope.length,
 222             brace : brace
 223         }
 224
 225     },
 226
 227
 228
 229     parseScope : function(scope) // parse a token stream..
 230     {
 231         //this.timerPrint("parseScope EnterScope");
 232         //this.log(">>> ENTER SCOPE" + this.scopes.length);
 233         var symbol;
 234         var token;
 235
 236         var identifier;
 237
 238         var expressionBraceNesting = this.braceNesting + 0;
 239
 240         var parensNesting = 0;
 241
 242         var isObjectLitAr = [ false ];
 243         var isInObjectLitAr;
 244         this.scopes.push(scope);
 245
 246         var scopeIndent = '';
 247         this.scopes.forEach(function() {
 248             scopeIndent += '   ';
 249         });
 250         print(scopeIndent + ">> ENTER SCOPE");
 251
 252
 253
 254
 255         token = this.ts.lookTok(1);
 256         while (token) {
 257           //  this.timerPrint("parseScope AFTER lookT: " + token.toString());
 258             this.dumpToken(token , this.scopes, this.braceNesting);
 259             //this.log(token.data);
 260             if (token.type == 'NAME') {
 261             //    print('*' + token.data);
 262             }
 263             switch(token.type + '.' + token.name) {
 264                 case "KEYW.VAR":
 265                 case "KEYW.CONST": // not really relivant as it's only mozzy that does this.
 266
 267                     print ("GOT VAR");
 268                     //this.log("parseScope GOT VAR/CONST : " + token.toString());
 269                     while (true) {
 270                         token = this.ts.nextTok();
 271                         !this.debug|| print( token.toString());
 272
 273                         if (!token) { // can return false at EOF!
 274                             break;
 275                         }
 276                         if (token.name == "VAR" || token.data == ',') { // kludge..
 277                             continue;
 278                         }
 279                         //this.logR("parseScope GOT VAR  : <B>" + token.toString() + "</B>");
 280                         if (token.type !="NAME") {
 281                             for(var i = Math.max(this.ts.cursor-10,0); i < this.ts.cursor+1; i++) {
 282                                 print(this.ts.tokens[i].toString());
 283                             }
 284
 285                             print( "var without ident");
 286                             Seed.quit()
 287                         }
 288
 289
 290                         if (this.mode == "BUILDING_SYMBOL_TREE") {
 291                             identifier = scope.getIdentifier(token.data) ;
 292
 293                             if (identifier == false) {
 294                                 scope.declareIdentifier(token.data, token);
 295                             } else {
 296                                 token.identifier = identifier;
 297                                 this.warn("(SCOPE) The variable " + token.data  + ' (line:' + token.line + ")  has already been declared in the same scope...");
 298                             }
 299                         }
 300
 301                         token = this.ts.nextTok();
 302                         !this.debug|| print(token.toString());
 303                         /*
 304                         assert token.getType() == Token.SEMI ||
 305                                 token.getType() == Token.ASSIGN ||
 306                                 token.getType() == Token.COMMA ||
 307                                 token.getType() == Token.IN;
 308                         */
 309                         if (token.name == "IN") {
 310                             break;
 311                         } else {
 312                             //var bn = this.braceNesting;
 313                             var bn = this.braceNesting;
 314                             this.parseExpression();
 315                             this.braceNesting = bn;
 316                             //this.braceNesting = bn;
 317                             //this.logR("parseScope DONE  : <B>ParseExpression</B> - tok is:" + this.ts.lookT(0).toString());
 318
 319                             token = this.ts.lookTok(1);
 320                             !this.debug|| print("AFTER EXP: " + token.toString());
 321                             if (token.data == ';') {
 322                                 break;
 323                             }
 324                         }
 325                     }
 326                     break;
 327                 case "KEYW.FUNCTION":
 328                     //println("<i>"+token.data+"</i>");
 329                      var bn = this.braceNesting;
 330                     this.parseFunctionDeclaration();
 331                      this.braceNesting = bn;
 332                     break;
 333
 334                 case "PUNC.LEFT_CURLY": // {
 335                     //println("<i>"+token.data+"</i>");
 336                     isObjectLitAr.push(false);
 337                     this.braceNesting++;
 338
 339                     //print(">>>>>> OBJLIT PUSH(false)" + this.braceNesting);
 340                     break;
 341
 342                 case "PUNC.RIGHT_CURLY": // }
 343                     //println("<i>"+token.data+"</i>");
 344                     this.braceNesting--;
 345                     isObjectLitAr.pop();
 346                     //print(">>>>>> OBJLIT POP"+ this.braceNesting);
 347                         //assert braceNesting >= scope.getBra ceNesting();
 348
 349                     if (this.braceNesting < expressionBraceNesting) {
 350                         var ls = this.scopes.pop();
 351                         ls.getUsedSymbols();
 352                         // eat symbol if we are currently at {
 353                         if (this.ts.look(0).data == '{') {
 354                             this.ts.nextTok();
 355                         }
 356
 357                         print("<<<<<<<EXIT SCOPE" +this.scopes.length);
 358                         return;
 359                     }
 360                     break;
 361
 362                 case "KEYW.WITH":
 363                     //println("<i>"+token.data+"</i>");
 364                     if (this.mode == "BUILDING_SYMBOL_TREE") {
 365                         // Inside a 'with' block, it is impossible to figure out
 366                         // statically whether a symbol is a local variable or an
 367                         // object member. As a consequence, the only thing we can
 368                         // do is turn the obfuscation off for the highest scope
 369                         // containing the 'with' block.
 370                         this.protectScopeFromObfuscation(scope);
 371                         this.warn("Using 'with' is not recommended." + (this.munge ? " Moreover, using 'with' reduces the level of compression!" : ""), true);
 372                     }
 373                     break;
 374
 375                 case "KEYW.CATCH":
 376                     //println("<i>"+token.data+"</i>");
 377                     this.parseCatch();
 378                     break;
 379                 /*
 380                 case Token.SPECIALCOMMENT:
 381                         if (mode == BUILDING_SYMBOL_TREE) {
 382                             protectScopeFromObfuscation(scope);
 383                             this.warn("Using JScript conditional comments is not recommended." + (munge ? " Moreover, using JScript conditional comments reduces the level of compression." : ""), true);
 384                         }
 385                         break;
 386                 */
 387
 388                 case "STRN.DOUBLE_QUOTE": // used for object lit detection..
 389                 case "STRN.SINGLE_QUOTE":
 390                     //println("<i>"+token.data+"</i>");
 391                     if (this.ts.lookTok(-1).data == '{' && this.ts.lookTok(1).data == ':') {
 392                         // then we are in an object lit.. -> we need to flag the brace as such...
 393                         isObjectLitAr.pop();
 394                         isObjectLitAr.push(true);
 395                         //print(">>>>>> OBJLIT REPUSH(true)");
 396                     }
 397                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 398
 399                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ':' &&
 400                         ( this.ts.lookTok(-1).data == '{'  ||  this.ts.lookTok(-1).data == ':' )) {
 401                         // see if we can replace..
 402                         // remove the quotes..
 403                         // should do a bit more checking!!!! (what about wierd char's in the string..
 404                         var str = token.data.substring(1,token.data.length-1);
 405                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 406                             token.outData = str;
 407                         }
 408
 409
 410
 411                     }
 412
 413
 414
 415                     break;
 416
 417                 case "NAME.NAME":
 418
 419                     //print("DEAL WITH NAME:");
 420                     // got identifier..
 421
 422                     // look for  { ** : <- indicates obj literal.. ** this could occur with numbers ..
 423                     if ((this.ts.lookTok(-1).data == "{") && (this.ts.lookTok(1).data == ":")) {
 424                         isObjectLitAr.pop();
 425                         isObjectLitAr.push(true);
 426                         //print(">>>>>> OBJLIT REPUSH(true)");
 427                         //println("<i>"+token.data+"</i>");
 428                         break;
 429                     }
 430                    // print("DEAL WITH obj lit:");
 431                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 432
 433                     if (isInObjectLitAr && (this.ts.lookTok(1).data == ":") && (this.ts.lookTok(-1).data == ",")) {
 434                         // skip, it's an object lit key..
 435                         //println("<i>"+token.data+"</i>");
 436                         break;
 437                     }
 438
 439
 440                     // skip anyting with "." before it..!!
 441
 442                     if (this.ts.lookTok(-1).data == ".") {
 443                         // skip, it's an object prop.
 444                         //println("<i>"+token.data+"</i>");
 445                         break;
 446                     }
 447                     symbol = token.data;
 448                     if (this.mode == 'PASS2_SYMBOL_TREE') {
 449
 450                         //println("GOT IDENT: -2 : " + this.ts.lookT(-2).toString() + " <BR> ..... -1 :  " +  this.ts.lookT(-1).toString() + " <BR> ");
 451
 452                         //print ("MUNGE?" + symbol);
 453
 454                         //println("GOT IDENT: <B>" + symbol + "</B><BR/>");
 455
 456                             //println("GOT IDENT (2): <B>" + symbol + "</B><BR/>");
 457                         identifier = this.getIdentifier(symbol, scope);
 458
 459                         if (identifier == false) {
 460 // BUG!find out where builtin is defined...
 461                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 462                                 // Here, we found an undeclared and un-namespaced symbol that is
 463                                 // 3 characters or less in length. Declare it in the global scope.
 464                                 // We don't need to declare longer symbols since they won't cause
 465                                 // any conflict with other munged symbols.
 466                                 this.globalScope.declareIdentifier(symbol, token);
 467                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 468                             }
 469
 470                             //println("GOT IDENT IGNORE(3): <B>" + symbol + "</B><BR/>");
 471                         } else {
 472                             token.identifier = identifier;
 473                             identifier.refcount++;
 474                         }
 475                     }
 476
 477                     break;
 478                     //println("<B>SID</B>");
 479                 default:
 480                     if (token.type != 'KEYW') {
 481                         break;
 482                     }
 483                    // print("Check eval:");
 484
 485                     symbol = token.data;
 486
 487                      if (this.mode == 'BUILDING_SYMBOL_TREE') {
 488
 489                         if (symbol == "eval") {
 490                             // look back one and see if we can find a comment!!!
 491                             if (this.ts.look(-1).type == "COMM") {
 492                                 // look for eval:var:noreplace\n
 493                                 var _t = this;
 494                                 this.ts.look(-1).data.replace(/eval:var:([a-z_]+)/ig, function(m, a) {
 495
 496                                     var hi = _t.getIdentifier(a, scope);
 497                                    // println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 498                                     if (hi) {
 499                                      //   println("PROTECT "+a+" from munge");
 500                                         hi.toMunge = false;
 501                                     }
 502
 503                                 });
 504
 505
 506                             } else {
 507
 508
 509                                 this.protectScopeFromObfuscation(scope);
 510                                 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);
 511                             }
 512
 513                         }
 514
 515                     }
 516                     break;
 517
 518
 519             } // end switch
 520
 521
 522             //print("parseScope TOK : " + token.toString());
 523             token = this.ts.nextTok();
 524             //if (this.ts.nextT()) break;
 525
 526         }
 527         //print("<<<<<<<EXIT SCOPE ERR?" +this.scopes.length);
 528     },
 529
 530
 531     parseExpression : function() {
 532
 533         // Parse the expression until we encounter a comma or a semi-colon
 534         // in the same brace nesting, bracket nesting and paren nesting.
 535         // Parse functions if any...
 536         //println("<i>EXP</i><BR/>");
 537         !this.debug || print("PARSE EXPR");
 538
 539
 540         // for printing stuff..
 541
 542
 543
 544         var symbol;
 545         var token;
 546         var currentScope;
 547         var identifier;
 548
 549         var expressionBraceNesting = this.braceNesting + 0;
 550         var bracketNesting = 0;
 551         var parensNesting = 0;
 552         var isInObjectLitAr;
 553         var isObjectLitAr = [ false ];
 554
 555         currentScope = this.scopes[this.scopes.length-1];
 556
 557         var scopeIndent = '';
 558         this.scopes.forEach(function() {
 559             scopeIndent += '   ';
 560         });
 561         print(scopeIndent + ">> ENTER EXPRESSION");
 562         while (token = this.ts.lookTok()) {
 563
 564
 565
 566            /*
 567             // moved out of loop?
 568            currentScope = this.scopes[this.scopes.length-1];
 569
 570             var scopeIndent = '';
 571             this.scopes.forEach(function() {
 572                 scopeIndent += '   ';
 573             });
 574            */
 575
 576            this.dumpToken(token,  this.scopes, this.braceNesting );
 577
 578
 579             //println("<i>"+token.data+"</i>");
 580             //this.log("EXP:" + token.data);
 581             switch (token.type) {
 582                 case 'PUNC':
 583                     switch(token.data) {
 584
 585                         case ';':
 586                         case ',':
 587                             if (this.braceNesting == expressionBraceNesting &&
 588                                     bracketNesting == 0 &&
 589                                     parensNesting == 0) {
 590                                 print(scopeIndent + "<< EXIT EXPRESSION");
 591                                 return;
 592                             }
 593                             break;
 594
 595
 596
 597                         case '{': //Token.LC:
 598                             isObjectLitAr.push(false);
 599
 600                             this.braceNesting++;
 601                             ///print(">>>>> EXP PUSH(false)"+this.braceNesting);
 602                             break;
 603
 604                         case '}': //Token.RC:
 605                             this.braceNesting--;
 606                             isObjectLitAr.pop();
 607                             //print(">>>>> EXP POP" + this.braceNesting);
 608                            // assert braceNesting >= expressionBraceNesting;
 609                             break;
 610
 611                         case '[': //Token.LB:
 612                             bracketNesting++;
 613                             break;
 614
 615                         case ']': //Token.RB:
 616                             bracketNesting--;
 617                             break;
 618
 619                         case '(': //Token.LP:
 620                             parensNesting++;
 621                             break;
 622
 623                         case ')': //Token.RP:
 624                             parensNesting--;
 625                             break;
 626                     }
 627                     break;
 628
 629                 case 'STRN': // used for object lit detection..
 630                     if (this.ts.lookTok(-1).data == "{" && this.ts.lookTok(1).data == ":" ) {
 631                         // then we are in an object lit.. -> we need to flag the brace as such...
 632                         isObjectLitAr.pop();
 633                         isObjectLitAr.push(true);
 634                         //print(">>>>> EXP PUSH(true)");
 635                     }
 636
 637
 638
 639                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 640                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ":"  &&
 641                         ( this.ts.lookTok(-1).data == "{"  ||  this.ts.lookTok(-1).data == "," )) {
 642                         // see if we can replace..
 643                         // remove the quotes..
 644                         var str = token.data.substring(1,token.data.length-1);
 645                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 646                             token.outData = str;
 647                         }
 648
 649
 650
 651                     }
 652
 653                     break;
 654
 655
 656
 657                 case 'NAME':
 658
 659                     symbol = token.data;
 660                     //print("in NAME = " + token.toString());
 661                     //print("in NAME 0: " + this.ts.look(0).toString());
 662                     //print("in NAME 2: " + this.ts.lookTok(2).toString());
 663                     if (this.ts.look(0).data == "{"  && this.ts.lookTok(2).data == ":") {
 664                         // then we are in an object lit.. -> we need to flag the brace as such...
 665                         isObjectLitAr.pop();
 666                         isObjectLitAr.push(true);
 667                          //print(">>>>> EXP  PUSH(true)");
 668                         break;
 669                     }
 670
 671                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 672                     //print ("isInObjectLitAr : " + isInObjectLitAr + ' ' + token.toString());
 673
 674                     if (isInObjectLitAr && this.ts.lookTok(0).data == "," && this.ts.lookTok(2).data == ":") {
 675                         break;
 676                     }
 677                     //print(this.ts.lookTok(0).data);
 678                     if (this.ts.lookTok(0).data == ".") {
 679                         //skip '.'
 680                         break;
 681                     }
 682
 683                      if (this.mode == 'PASS2_SYMBOL_TREE') {
 684
 685                         identifier = this.getIdentifier(symbol, currentScope);
 686                         //println("<B>??</B>");
 687                         if (identifier == false) {
 688
 689                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 690                                 // Here, we found an undeclared and un-namespaced symbol that is
 691                                 // 3 characters or less in length. Declare it in the global scope.
 692                                 // We don't need to declare longer symbols since they won't cause
 693                                 // any conflict with other munged symbols.
 694                                 this.globalScope.declareIdentifier(symbol, token);
 695                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 696                             } else {
 697                                 //println("undeclared")
 698                             }
 699
 700
 701                         } else {
 702                             //println("<B>++</B>");
 703                             token.identifier = identifier;
 704                             identifier.refcount++;
 705                         }
 706
 707                     }
 708                     break;
 709
 710
 711
 712
 713                     //println("<B>EID</B>");
 714                  case 'KEYW':
 715
 716                     if (token.name == "FUNCTION") {
 717
 718                         this.parseFunctionDeclaration();
 719                         break;
 720                     }
 721
 722
 723
 724                     symbol = token.data;
 725                     if (this.mode == 'BUILDING_SYMBOL_TREE') {
 726
 727                         if (symbol == "eval") {
 728                             if (this.ts.look(-1).type == 'COMM') {
 729                                 // look for eval:var:noreplace\n
 730                                 var _t = this;
 731                                 this.ts.look(-1).data.replace(/eval:var:([a-z]+)/ig, function(m, a) {
 732                                     var hi = _t.getIdentifier(a, currentScope);
 733                                    //println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 734                                     if (hi) {
 735                                       //  println("PROTECT "+a+" from munge");
 736                                         hi.toMunge = false;
 737                                     }
 738
 739
 740                                 });
 741
 742                             } else {
 743                                 this.protectScopeFromObfuscation(currentScope);
 744                                 this.warn("Using 'eval' is not recommended." + (this.munge ? " Moreover, using 'eval' reduces the level of compression!" : ""), true);
 745                             }
 746
 747
 748                         }
 749                         break;
 750                     }
 751
 752             }
 753             if (!this.ts.nextTok()) break;
 754         }
 755         print(scopeIndent + "<< EXIT EXPRESSION");
 756     },
 757
 758
 759     parseCatch : function() {
 760
 761         var symbol;
 762         var token;
 763         var currentScope;
 764         var identifier;
 765
 766         //token = getToken(-1);
 767         //assert token.getType() == Token.CATCH;
 768         token = this.ts.nextTok();
 769         //assert token.getType() == Token.LP; (
 770         token = this.ts.nextTok();
 771         //assert token.getType() == Token.NAME;
 772
 773         symbol = token.data;
 774         currentScope = this.scopes[this.scopes.length-1];
 775
 776         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 777             // We must declare the exception identifier in the containing function
 778             // scope to avoid errors related to the obfuscation process. No need to
 779             // display a warning if the symbol was already declared here...
 780             currentScope.declareIdentifier(symbol, token);
 781         } else {
 782             //?? why inc the refcount?? - that should be set when building the tree???
 783             identifier = this.getIdentifier(symbol, currentScope);
 784             identifier.refcount++;
 785         }
 786
 787         token = this.ts.nextTok();
 788         //assert token.getType() == Token.RP; // )
 789     },
 790
 791     parseFunctionDeclaration : function()
 792     {
 793         print("PARSE FUNCTION");
 794         var symbol;
 795         var token;
 796         var currentScope  = false;
 797         var fnScope = false;
 798         var identifier;
 799         var b4braceNesting = this.braceNesting + 0;
 800
 801         //this.logR("<B>PARSING FUNCTION</B>");
 802         currentScope = this.scopes[this.scopes.length-1];
 803
 804         token = this.ts.nextTok();
 805         if (token.type == "NAME") {
 806             if (this.mode == 'BUILDING_SYMBOL_TREE') {
 807                 // Get the name of the function and declare it in the current scope.
 808                 symbol = token.data;
 809                 if (currentScope.getIdentifier(symbol) != false) {
 810                     this.warn("The function " + symbol + " has already been declared in the same scope...", true);
 811                 }
 812                 currentScope.declareIdentifier(symbol,token);
 813             }
 814             token =  this.ts.nextTok();
 815         }
 816
 817         //assert token.getType() == Token.LP;
 818         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 819             fnScope = new Scope(this.braceNesting, currentScope, token.n, '');
 820
 821             //println("STORING SCOPE" + this.ts.cursor);
 822
 823             this.indexedScopes[this.ts.cursor] = fnScope;
 824
 825         } else {
 826             //qln("FETCHING SCOPE" + this.ts.cursor);
 827             fnScope = this.indexedScopes[this.ts.cursor];
 828
 829         }
 830
 831         // Parse function arguments.
 832         var argpos = 0;
 833         while (this.ts.lookTok().data != ')') { //(token = consumeToken()).getType() != Token.RP) {
 834             token = this.ts.nextTok();
 835            // print ("FUNC ARGS: " + token.toString())
 836             //assert token.getType() == Token.NAME ||
 837             //        token.getType() == Token.COMMA;
 838             if (token.type == 'NAME' && this.mode == 'BUILDING_SYMBOL_TREE') {
 839                 symbol = token.data;
 840                 identifier = fnScope.declareIdentifier(symbol,token);
 841                 if (symbol == "$super" && argpos == 0) {
 842                     // Exception for Prototype 1.6...
 843                     identifier.preventMunging();
 844                 }
 845                 argpos++;
 846             }
 847         }
 848
 849         token = this.ts.nextTok();
 850         print(token.toString());
 851         // assert token.getType() == Token.LC;
 852         this.braceNesting++;
 853
 854         token = this.ts.nextTok();
 855         print(token.toString());
 856         if (token.type == "STRN" && this.ts.lookTok(1).data == ';') {
 857             /*
 858
 859             NOT SUPPORTED YET!?!!?!
 860
 861             // This is a hint. Hints are empty statements that look like
 862             // "localvar1:nomunge, localvar2:nomunge"; They allow developers
 863             // to prevent specific symbols from getting obfuscated (some heretic
 864             // implementations, such as Prototype 1.6, require specific variable
 865             // names, such as $super for example, in order to work appropriately.
 866             // Note: right now, only "nomunge" is supported in the right hand side
 867             // of a hint. However, in the future, the right hand side may contain
 868             // other values.
 869             consumeToken();
 870             String hints = token.getValue();
 871             // Remove the leading and trailing quotes...
 872             hints = hints.substring(1, hints.length() - 1).trim();
 873             StringTokenizer st1 = new StringTokenizer(hints, ",");
 874             while (st1.hasMoreTokens()) {
 875                 String hint = st1.nextToken();
 876                 int idx = hint.indexOf(':');
 877                 if (idx <= 0 || idx >= hint.length() - 1) {
 878                     if (mode == BUILDING_SYMBOL_TREE) {
 879                         // No need to report the error twice, hence the test...
 880                         this.warn("Invalid hint syntax: " + hint, true);
 881                     }
 882                     break;
 883                 }
 884                 String variableName = hint.substring(0, idx).trim();
 885                 String variableType = hint.substring(idx + 1).trim();
 886                 if (mode == BUILDING_SYMBOL_TREE) {
 887                     fnScope.addHint(variableName, variableType);
 888                 } else if (mode == CHECKING_SYMBOL_TREE) {
 889                     identifier = fnScope.getIdentifier(variableName);
 890                     if (identifier != null) {
 891                         if (variableType.equals("nomunge")) {
 892                             identifier.preventMunging();
 893                         } else {
 894                             this.warn("Unsupported hint value: " + hint, true);
 895                         }
 896                     } else {
 897                         this.warn("Hint refers to an unknown identifier: " + hint, true);
 898                     }
 899                 }
 900             }
 901             */
 902         }
 903
 904         this.parseScope(fnScope);
 905         // now pop it off the stack!!!
 906
 907         this.braceNesting = b4braceNesting;
 908         print("ENDFN -1: " + this.ts.lookTok(-1).toString());
 909         print("ENDFN 0: " + this.ts.lookTok(0).toString());
 910         print("ENDFN 1: " + this.ts.lookTok(1).toString());
 911     },
 912
 913     protectScopeFromObfuscation : function(scope) {
 914             //assert scope != null;
 915
 916         if (scope == this.globalScope) {
 917             // The global scope does not get obfuscated,
 918             // so we don't need to worry about it...
 919             return;
 920         }
 921
 922         // Find the highest local scope containing the specified scope.
 923         while (scope && scope.parent != this.globalScope) {
 924             scope = scope.parent;
 925         }
 926
 927         //assert scope.getParentScope() == globalScope;
 928         scope.preventMunging();
 929     },
 930
 931     getIdentifier: function(symbol, scope) {
 932         var identifier;
 933         while (scope != false) {
 934             identifier = scope.getIdentifier(symbol);
 935             //println("ScopeParser.getIdentgetUsedSymbols("+symbol+")=" + scope.getUsedSymbols().join(','));
 936             if (identifier) {
 937                 return identifier;
 938             }
 939             scope = scope.parent;
 940         }
 941         return false;
 942     }
 943 };