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                     print('SCOPE-VAR:' + token.toString());
 250                     var vstart = this.ts.cursor +1;
 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                     //print("VAR:")
 312                     //this.ts.dump(vstart , this.ts.cursor);
 313
 314                     break;
 315                 case "KEYW.FUNCTION":
 316                     print('SCOPE-FUNC:' + token.toString());
 317                     //println("<i>"+token.data+"</i>");
 318                      var bn = this.braceNesting;
 319                     this.parseFunctionDeclaration();
 320                      this.braceNesting = bn;
 321                     break;
 322
 323                 case "PUNC.LEFT_CURLY": // {
 324                     print('SCOPE-CURLY:' + JSON.stringify(token,null,4));
 325                     //println("<i>"+token.data+"</i>");
 326
 327                     if (token.props) {
 328                         // it's an object literal..
 329                         // the values could be replaced..
 330
 331                     }
 332
 333                     isObjectLitAr.push(false);
 334                     this.braceNesting++;
 335
 336                     //print(">>>>>> OBJLIT PUSH(false)" + this.braceNesting);
 337                     break;
 338 /*
 339                 case "PUNC.RIGHT_CURLY": // }
 340                     //println("<i>"+token.data+"</i>");
 341                     this.braceNesting--;
 342                     isObjectLitAr.pop();
 343                     //print(">>>>>> OBJLIT POP"+ this.braceNesting);
 344                         //assert braceNesting >= scope.getBra ceNesting();
 345
 346                     if (this.braceNesting < expressionBraceNesting) {
 347                         var ls = this.scopes.pop();
 348                         ls.getUsedSymbols();
 349                         // eat symbol if we are currently at {
 350                         if (this.ts.look(0).data == '{') {
 351                             this.ts.nextTok();
 352                         }
 353
 354                         print("<<<<<<<EXIT SCOPE" +this.scopes.length);
 355                         return;
 356                     }
 357                     break;
 358 */
 359                 case "KEYW.WITH":
 360                     print('SCOPE-WITH:' + token.toString());
 361                     //println("<i>"+token.data+"</i>");
 362                     if (this.mode == "BUILDING_SYMBOL_TREE") {
 363                         // Inside a 'with' block, it is impossible to figure out
 364                         // statically whether a symbol is a local variable or an
 365                         // object member. As a consequence, the only thing we can
 366                         // do is turn the obfuscation off for the highest scope
 367                         // containing the 'with' block.
 368                         this.protectScopeFromObfuscation(scope);
 369                         this.warn("Using 'with' is not recommended." + (this.munge ? " Moreover, using 'with' reduces the level of compression!" : ""), true);
 370                     }
 371                     break;
 372
 373                 case "KEYW.CATCH":
 374                     print('SCOPE-CATCH:' + token.toString());
 375                     //println("<i>"+token.data+"</i>");
 376                     this.parseCatch();
 377                     break;
 378                 /*
 379                 case Token.SPECIALCOMMENT:
 380                         if (mode == BUILDING_SYMBOL_TREE) {
 381                             protectScopeFromObfuscation(scope);
 382                             this.warn("Using JScript conditional comments is not recommended." + (munge ? " Moreover, using JScript conditional comments reduces the level of compression." : ""), true);
 383                         }
 384                         break;
 385                 */
 386
 387                 case "STRN.DOUBLE_QUOTE": // used for object lit detection..
 388                 case "STRN.SINGLE_QUOTE":
 389                     print('SCOPE-STRING:' + token.toString());
 390                     //println("<i>"+token.data+"</i>");
 391
 392                     if (this.ts.lookTok(-1).data == '{' && this.ts.lookTok(1).data == ':') {
 393                         // then we are in an object lit.. -> we need to flag the brace as such...
 394                         isObjectLitAr.pop();
 395                         isObjectLitAr.push(true);
 396                         //print(">>>>>> OBJLIT REPUSH(true)");
 397                     }
 398                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 399
 400                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ':' &&
 401                         ( this.ts.lookTok(-1).data == '{'  ||  this.ts.lookTok(-1).data == ':' )) {
 402                         // see if we can replace..
 403                         // remove the quotes..
 404                         // should do a bit more checking!!!! (what about wierd char's in the string..
 405                         var str = token.data.substring(1,token.data.length-1);
 406                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 407                             token.outData = str;
 408                         }
 409
 410
 411
 412                     }
 413
 414
 415
 416                     break;
 417
 418                 case "NAME.NAME":
 419                     print('SCOPE-NAME:' + token.toString());
 420                     //print("DEAL WITH NAME:");
 421                     // got identifier..
 422
 423                     // look for  { ** : <- indicates obj literal.. ** this could occur with numbers ..
 424                     if ((this.ts.lookTok(-1).data == "{") && (this.ts.lookTok(1).data == ":")) {
 425                         isObjectLitAr.pop();
 426                         isObjectLitAr.push(true);
 427                         //print(">>>>>> OBJLIT REPUSH(true)");
 428                         //println("<i>"+token.data+"</i>");
 429                         break;
 430                     }
 431                    // print("DEAL WITH obj lit:");
 432                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 433
 434                     if (isInObjectLitAr && (this.ts.lookTok(1).data == ":") && (this.ts.lookTok(-1).data == ",")) {
 435                         // skip, it's an object lit key..
 436                         //println("<i>"+token.data+"</i>");
 437                         break;
 438                     }
 439
 440
 441                     // skip anyting with "." before it..!!
 442
 443                     if (this.ts.lookTok(-1).data == ".") {
 444                         // skip, it's an object prop.
 445                         //println("<i>"+token.data+"</i>");
 446                         break;
 447                     }
 448                     //print("SYMBOL: " + token.toString());
 449
 450                     symbol = token.data;
 451                     if (this.mode == 'PASS2_SYMBOL_TREE') {
 452
 453                         //println("GOT IDENT: -2 : " + this.ts.lookT(-2).toString() + " <BR> ..... -1 :  " +  this.ts.lookT(-1).toString() + " <BR> ");
 454
 455                         //print ("MUNGE?" + symbol);
 456
 457                         //println("GOT IDENT: <B>" + symbol + "</B><BR/>");
 458
 459                             //println("GOT IDENT (2): <B>" + symbol + "</B><BR/>");
 460                         identifier = this.getIdentifier(symbol, scope);
 461
 462                         if (identifier == false) {
 463 // BUG!find out where builtin is defined...
 464                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 465                                 // Here, we found an undeclared and un-namespaced symbol that is
 466                                 // 3 characters or less in length. Declare it in the global scope.
 467                                 // We don't need to declare longer symbols since they won't cause
 468                                 // any conflict with other munged symbols.
 469                                 this.globalScope.declareIdentifier(symbol, token);
 470                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 471                             }
 472
 473                             //println("GOT IDENT IGNORE(3): <B>" + symbol + "</B><BR/>");
 474                         } else {
 475                             token.identifier = identifier;
 476                             identifier.refcount++;
 477                         }
 478                     }
 479
 480                     break;
 481                     //println("<B>SID</B>");
 482                 default:
 483                     if (token.type != 'KEYW') {
 484                         break;
 485                     }
 486                     print('SCOPE-KEYW:' + token.toString());
 487                    // print("Check eval:");
 488
 489                     symbol = token.data;
 490
 491                      if (this.mode == 'BUILDING_SYMBOL_TREE') {
 492
 493                         if (symbol == "eval") {
 494                             // look back one and see if we can find a comment!!!
 495                             if (this.ts.look(-1).type == "COMM") {
 496                                 // look for eval:var:noreplace\n
 497                                 var _t = this;
 498                                 this.ts.look(-1).data.replace(/eval:var:([a-z_]+)/ig, function(m, a) {
 499
 500                                     var hi = _t.getIdentifier(a, scope);
 501                                    // println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 502                                     if (hi) {
 503                                      //   println("PROTECT "+a+" from munge");
 504                                         hi.toMunge = false;
 505                                     }
 506
 507                                 });
 508
 509
 510                             } else {
 511
 512
 513                                 this.protectScopeFromObfuscation(scope);
 514                                 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);
 515                             }
 516
 517                         }
 518
 519                     }
 520                     break;
 521
 522
 523             } // end switch
 524
 525
 526             //print("parseScope TOK : " + token.toString());
 527             token = this.ts.nextTok();
 528             //if (this.ts.nextT()) break;
 529
 530         }
 531         //print("<<<<<<<EXIT SCOPE ERR?" +this.scopes.length);
 532     },
 533
 534     expN : 0,
 535     parseExpression : function() {
 536
 537         // Parse the expression until we encounter a comma or a semi-colon
 538         // in the same brace nesting, bracket nesting and paren nesting.
 539         // Parse functions if any...
 540         //println("<i>EXP</i><BR/>");
 541         !this.debug || print("PARSE EXPR");
 542         this.expN++;
 543
 544         // for printing stuff..
 545
 546
 547
 548         var symbol;
 549         var token;
 550         var currentScope;
 551         var identifier;
 552
 553         var expressionBraceNesting = this.braceNesting + 0;
 554         var bracketNesting = 0;
 555         var parensNesting = 0;
 556         var isInObjectLitAr;
 557         var isObjectLitAr = [ false ];
 558
 559         currentScope = this.scopes[this.scopes.length-1];
 560
 561         var scopeIndent = '';
 562         this.scopes.forEach(function() {
 563             scopeIndent += '   ';
 564         });
 565         //print(scopeIndent + ">> ENTER EXPRESSION" + this.expN);
 566         while (token = this.ts.lookTok()) {
 567
 568
 569
 570            /*
 571             // moved out of loop?
 572            currentScope = this.scopes[this.scopes.length-1];
 573
 574             var scopeIndent = '';
 575             this.scopes.forEach(function() {
 576                 scopeIndent += '   ';
 577             });
 578            */
 579
 580            //this.dumpToken(token,  this.scopes, this.braceNesting );
 581            //print('EXP' + this.expN + ':' + token.toString());
 582
 583
 584             //println("<i>"+token.data+"</i>");
 585             //this.log("EXP:" + token.data);
 586             switch (token.type) {
 587                 case 'PUNC':
 588                     switch(token.data) {
 589
 590                         case ';':
 591                         case ',':
 592                             if (this.braceNesting == expressionBraceNesting &&
 593                                     bracketNesting == 0 &&
 594                                     parensNesting == 0) {
 595                                 print(scopeIndent + "<< EXIT EXPRESSION");
 596                                 this.expN--;
 597                                 return;
 598                             }
 599                             break;
 600
 601
 602
 603                         case '{': //Token.LC:
 604                             isObjectLitAr.push(false);
 605
 606                             this.braceNesting++;
 607                             ///print(">>>>> EXP PUSH(false)"+this.braceNesting);
 608                             break;
 609
 610                         case '}': //Token.RC:
 611                             this.braceNesting--;
 612                             isObjectLitAr.pop();
 613                             //print(">>>>> EXP POP" + this.braceNesting);
 614                            // assert braceNesting >= expressionBraceNesting;
 615                             break;
 616
 617                         case '[': //Token.LB:
 618                             bracketNesting++;
 619                             break;
 620
 621                         case ']': //Token.RB:
 622                             bracketNesting--;
 623                             break;
 624
 625                         case '(': //Token.LP:
 626                             parensNesting++;
 627                             break;
 628
 629                         case ')': //Token.RP:
 630                             parensNesting--;
 631                             break;
 632                     }
 633                     break;
 634
 635                 case 'STRN': // used for object lit detection..
 636                     if (this.ts.lookTok(-1).data == "{" && this.ts.lookTok(1).data == ":" ) {
 637                         // then we are in an object lit.. -> we need to flag the brace as such...
 638                         isObjectLitAr.pop();
 639                         isObjectLitAr.push(true);
 640                         //print(">>>>> EXP PUSH(true)");
 641                     }
 642
 643
 644
 645                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 646                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ":"  &&
 647                         ( this.ts.lookTok(-1).data == "{"  ||  this.ts.lookTok(-1).data == "," )) {
 648                         // see if we can replace..
 649                         // remove the quotes..
 650                         var str = token.data.substring(1,token.data.length-1);
 651                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 652                             token.outData = str;
 653                         }
 654
 655
 656
 657                     }
 658
 659                     break;
 660
 661
 662
 663                 case 'NAME':
 664
 665                     symbol = token.data;
 666                     //print("in NAME = " + token.toString());
 667                     //print("in NAME 0: " + this.ts.look(0).toString());
 668                     //print("in NAME 2: " + this.ts.lookTok(2).toString());
 669                     if (this.ts.look(0).data == "{"  && this.ts.lookTok(2).data == ":") {
 670                         // then we are in an object lit.. -> we need to flag the brace as such...
 671                         isObjectLitAr.pop();
 672                         isObjectLitAr.push(true);
 673                          //print(">>>>> EXP  PUSH(true)");
 674                         break;
 675                     }
 676
 677                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 678                     //print ("isInObjectLitAr : " + isInObjectLitAr + ' ' + token.toString());
 679
 680                     if (isInObjectLitAr && this.ts.lookTok(0).data == "," && this.ts.lookTok(2).data == ":") {
 681                         break;
 682                     }
 683                     //print(this.ts.lookTok(0).data);
 684                     if (this.ts.lookTok(0).data == ".") {
 685                         //skip '.'
 686                         break;
 687                     }
 688
 689                      if (this.mode == 'PASS2_SYMBOL_TREE') {
 690
 691                         identifier = this.getIdentifier(symbol, currentScope);
 692                         //println("<B>??</B>");
 693                         if (identifier == false) {
 694
 695                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 696                                 // Here, we found an undeclared and un-namespaced symbol that is
 697                                 // 3 characters or less in length. Declare it in the global scope.
 698                                 // We don't need to declare longer symbols since they won't cause
 699                                 // any conflict with other munged symbols.
 700                                 this.globalScope.declareIdentifier(symbol, token);
 701                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 702                             } else {
 703                                 //println("undeclared")
 704                             }
 705
 706
 707                         } else {
 708                             //println("<B>++</B>");
 709                             token.identifier = identifier;
 710                             identifier.refcount++;
 711                         }
 712
 713                     }
 714                     break;
 715
 716
 717
 718
 719                     //println("<B>EID</B>");
 720                  case 'KEYW':
 721
 722                     if (token.name == "FUNCTION") {
 723
 724                         this.parseFunctionDeclaration();
 725                         break;
 726                     }
 727
 728
 729
 730                     symbol = token.data;
 731                     if (this.mode == 'BUILDING_SYMBOL_TREE') {
 732
 733                         if (symbol == "eval") {
 734                             if (this.ts.look(-1).type == 'COMM') {
 735                                 // look for eval:var:noreplace\n
 736                                 var _t = this;
 737                                 this.ts.look(-1).data.replace(/eval:var:([a-z]+)/ig, function(m, a) {
 738                                     var hi = _t.getIdentifier(a, currentScope);
 739                                    //println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 740                                     if (hi) {
 741                                       //  println("PROTECT "+a+" from munge");
 742                                         hi.toMunge = false;
 743                                     }
 744
 745
 746                                 });
 747
 748                             } else {
 749                                 this.protectScopeFromObfuscation(currentScope);
 750                                 this.warn("Using 'eval' is not recommended." + (this.munge ? " Moreover, using 'eval' reduces the level of compression!" : ""), true);
 751                             }
 752
 753
 754                         }
 755                         break;
 756                     }
 757
 758             }
 759             if (!this.ts.nextTok()) break;
 760         }
 761         print(scopeIndent + "<< EXIT EXPRESSION");
 762         this.expN--;
 763     },
 764
 765
 766     parseCatch : function() {
 767
 768         var symbol;
 769         var token;
 770         var currentScope;
 771         var identifier;
 772
 773         //token = getToken(-1);
 774         //assert token.getType() == Token.CATCH;
 775         token = this.ts.nextTok();
 776         //assert token.getType() == Token.LP; (
 777         token = this.ts.nextTok();
 778         //assert token.getType() == Token.NAME;
 779
 780         symbol = token.data;
 781         currentScope = this.scopes[this.scopes.length-1];
 782
 783         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 784             // We must declare the exception identifier in the containing function
 785             // scope to avoid errors related to the obfuscation process. No need to
 786             // display a warning if the symbol was already declared here...
 787             currentScope.declareIdentifier(symbol, token);
 788         } else {
 789             //?? why inc the refcount?? - that should be set when building the tree???
 790             identifier = this.getIdentifier(symbol, currentScope);
 791             identifier.refcount++;
 792         }
 793
 794         token = this.ts.nextTok();
 795         //assert token.getType() == Token.RP; // )
 796     },
 797
 798     parseFunctionDeclaration : function()
 799     {
 800         //print("PARSE FUNCTION");
 801         var symbol;
 802         var token;
 803         var currentScope  = false;
 804         var fnScope = false;
 805         var identifier;
 806         var b4braceNesting = this.braceNesting + 0;
 807
 808         //this.logR("<B>PARSING FUNCTION</B>");
 809         currentScope = this.scopes[this.scopes.length-1];
 810
 811         token = this.ts.nextTok();
 812         if (token.type == "NAME") {
 813             if (this.mode == 'BUILDING_SYMBOL_TREE') {
 814                 // Get the name of the function and declare it in the current scope.
 815                 symbol = token.data;
 816                 if (currentScope.getIdentifier(symbol) != false) {
 817                     this.warn("The function " + symbol + " has already been declared in the same scope...", true);
 818                 }
 819                 currentScope.declareIdentifier(symbol,token);
 820             }
 821             token =  this.ts.nextTok();
 822         }
 823
 824         //assert token.getType() == Token.LP;
 825         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 826             fnScope = new Scope(this.braceNesting, currentScope, token.n, '');
 827
 828             //println("STORING SCOPE" + this.ts.cursor);
 829
 830             this.indexedScopes[this.ts.cursor] = fnScope;
 831
 832         } else {
 833             //qln("FETCHING SCOPE" + this.ts.cursor);
 834             fnScope = this.indexedScopes[this.ts.cursor];
 835
 836         }
 837
 838         // Parse function arguments.
 839         var argpos = 0;
 840         while (this.ts.lookTok().data != ')') { //(token = consumeToken()).getType() != Token.RP) {
 841             token = this.ts.nextTok();
 842            // print ("FUNC ARGS: " + token.toString())
 843             //assert token.getType() == Token.NAME ||
 844             //        token.getType() == Token.COMMA;
 845             if (token.type == 'NAME' && this.mode == 'BUILDING_SYMBOL_TREE') {
 846                 symbol = token.data;
 847                 identifier = fnScope.declareIdentifier(symbol,token);
 848                 if (symbol == "$super" && argpos == 0) {
 849                     // Exception for Prototype 1.6...
 850                     identifier.preventMunging();
 851                 }
 852                 argpos++;
 853             }
 854         }
 855
 856         token = this.ts.nextTok();
 857         //print(token.toString());
 858         // assert token.getType() == Token.LC;
 859         this.braceNesting++;
 860
 861         token = this.ts.nextTok();
 862         //print(token.toString());
 863
 864
 865         this.parseScope(fnScope);
 866         // now pop it off the stack!!!
 867
 868         this.braceNesting = b4braceNesting;
 869         //print("ENDFN -1: " + this.ts.lookTok(-1).toString());
 870         //print("ENDFN 0: " + this.ts.lookTok(0).toString());
 871         //print("ENDFN 1: " + this.ts.lookTok(1).toString());
 872     },
 873
 874     protectScopeFromObfuscation : function(scope) {
 875             //assert scope != null;
 876
 877         if (scope == this.globalScope) {
 878             // The global scope does not get obfuscated,
 879             // so we don't need to worry about it...
 880             return;
 881         }
 882
 883         // Find the highest local scope containing the specified scope.
 884         while (scope && scope.parent != this.globalScope) {
 885             scope = scope.parent;
 886         }
 887
 888         //assert scope.getParentScope() == globalScope;
 889         scope.preventMunging();
 890     },
 891
 892     getIdentifier: function(symbol, scope) {
 893         var identifier;
 894         while (scope != false) {
 895             identifier = scope.getIdentifier(symbol);
 896             //println("ScopeParser.getIdentgetUsedSymbols("+symbol+")=" + scope.getUsedSymbols().join(','));
 897             if (identifier) {
 898                 return identifier;
 899             }
 900             scope = scope.parent;
 901         }
 902         return false;
 903     }
 904 };