git.roojs.org Git - gnome.introspection-doc-generator/blob - JSDOC/ScopeParser.js

   1 //<Script type="text/javascript">
   2
   3 Scope = imports.Scope.Scope;
   4 TokenStream = imports.TokenStream.TokenStream;
   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         thisScope = scope;
 227         if (thisScope && thisScope.gid != this.scopes[this.scopes.length-1]) {
 228             this.scopes.push(scope);
 229         } else {
 230             thisScope = this.scopes[this.scopes.length-1]
 231         }
 232
 233         //var scopeIndent = '';
 234         //this.scopes.forEach(function() {
 235         //    scopeIndent += '   ';
 236         //});
 237         //print(">> ENTER SCOPE");
 238
 239
 240
 241
 242         token = this.ts.lookTok(1);
 243         while (token) {
 244           //  this.timerPrint("parseScope AFTER lookT: " + token.toString());
 245             //this.dumpToken(token , this.scopes, this.braceNesting);
 246             //print('SCOPE:' + token.toString());
 247             //this.log(token.data);
 248             if (token.type == 'NAME') {
 249             //    print('*' + token.data);
 250             }
 251             switch(token.type + '.' + token.name) {
 252                 case "KEYW.VAR":
 253                 case "KEYW.CONST": // not really relivant as it's only mozzy that does this.
 254                     //print('SCOPE-VAR:' + token.toString());
 255                     var vstart = this.ts.cursor +1;
 256
 257                     //this.log("parseScope GOT VAR/CONST : " + token.toString());
 258                     while (true) {
 259                         token = this.ts.nextTok();
 260                         //!this.debug|| print( token.toString());
 261                         //print('SCOPE-VAR-VAL:' + token.toString());
 262                         if (!token) { // can return false at EOF!
 263                             break;
 264                         }
 265                         if (token.name == "VAR" || token.data == ',') { // kludge..
 266                             continue;
 267                         }
 268                         //this.logR("parseScope GOT VAR  : <B>" + token.toString() + "</B>");
 269                         if (token.type != "NAME") {
 270                             for(var i = Math.max(this.ts.cursor-10,0); i < this.ts.cursor+1; i++) {
 271                                 print(this.ts.tokens[i].toString());
 272                             }
 273
 274                             print( "var without ident");
 275                             Seed.quit()
 276                         }
 277
 278
 279                         if (this.mode == "BUILDING_SYMBOL_TREE") {
 280                             identifier = thisScope.getIdentifier(token.data,token) ;
 281
 282                             if (identifier == false) {
 283                                 thisScope.declareIdentifier(token.data, token);
 284                             } else {
 285                                 token.identifier = identifier;
 286                                 this.warn("(SCOPE) The variable " + token.data  + ' (line:' + token.line + ")  has already been declared in the same scope...");
 287                             }
 288                         }
 289
 290                         token = this.ts.nextTok();
 291                         !this.debug|| print(token.toString());
 292                         /*
 293                         assert token.getType() == Token.SEMI ||
 294                                 token.getType() == Token.ASSIGN ||
 295                                 token.getType() == Token.COMMA ||
 296                                 token.getType() == Token.IN;
 297                         */
 298                         if (token.name == "IN") {
 299                             break;
 300                         } else {
 301                             //var bn = this.braceNesting;
 302                             var bn = this.braceNesting;
 303                             this.parseExpression();
 304                             this.braceNesting = bn;
 305                             //this.braceNesting = bn;
 306                             //this.logR("parseScope DONE  : <B>ParseExpression</B> - tok is:" + this.ts.lookT(0).toString());
 307
 308                             token = this.ts.lookTok(1);
 309                             !this.debug|| print("AFTER EXP: " + token.toString());
 310                             if (token.data == ';') {
 311                                 break;
 312                             }
 313                         }
 314                     }
 315
 316                     //print("VAR:")
 317                     //this.ts.dump(vstart , this.ts.cursor);
 318
 319                     break;
 320                 case "KEYW.FUNCTION":
 321                     //if (this.mode == 'BUILDING_SYMBOL_TREE')
 322                     //    print('SCOPE-FUNC:' + JSON.stringify(token,null,4));
 323                     //println("<i>"+token.data+"</i>");
 324                      var bn = this.braceNesting;
 325                     this.parseFunctionDeclaration();
 326                      this.braceNesting = bn;
 327                     break;
 328
 329                 case "PUNC.LEFT_CURLY": // {
 330                 case "PUNC.LEFT_PAREN": // (
 331                     //print('SCOPE-CURLY/PAREN:' + token.toString());
 332                     //println("<i>"+token.data+"</i>");
 333                     var curTS = this.ts;
 334                     if (token.props) {
 335
 336                         for (var prop in token.props) {
 337
 338
 339                           //  print('SCOPE-PROPS:' + JSON.stringify(token.props[prop],null,4));
 340                             if (token.props[prop].val[0].data == 'function') {
 341                                 // parse a function..
 342                                 this.ts = new TokenStream(token.props[prop].val);
 343                                 this.ts.nextTok();
 344                                 this.parseFunctionDeclaration();
 345
 346                                 continue;
 347                             }
 348                             // key value..
 349
 350                             this.ts = new TokenStream(token.props[prop].val);
 351                             this.parseScope(false);
 352
 353                         }
 354                         this.ts = curTS;
 355
 356                         // it's an object literal..
 357                         // the values could be replaced..
 358                         break;
 359                     }
 360
 361
 362                     var _this = this;
 363                     token.items.forEach(function(expr) {
 364                           _this.ts = new TokenStream(expr);
 365                           _this.parseExpression()
 366                     });
 367                     this.ts = curTS;
 368                     //print("NOT PROPS"); Seed.quit();
 369
 370                     //isObjectLitAr.push(false);
 371                     //this.braceNesting++;
 372
 373                     //print(">>>>>> OBJLIT PUSH(false)" + this.braceNesting);
 374                     break;
 375
 376                 case "PUNC.RIGHT_CURLY": // }
 377                     //print("<< EXIT SCOPE");
 378                     return;
 379                 /*
 380                     //println("<i>"+token.data+"</i>");
 381                     this.braceNesting--;
 382                     isObjectLitAr.pop();
 383                     //print(">>>>>> OBJLIT POP"+ this.braceNesting);
 384                         //assert braceNesting >= scope.getBra ceNesting();
 385
 386                     if (this.braceNesting < expressionBraceNesting) {
 387                         var ls = this.scopes.pop();
 388                         ls.getUsedSymbols();
 389                         // eat symbol if we are currently at {
 390                         if (this.ts.look(0).data == '{') {
 391                             this.ts.nextTok();
 392                         }
 393
 394                         print("<<<<<<<EXIT SCOPE" +this.scopes.length);
 395                         return;
 396                     }
 397                     break;
 398 */
 399                 case "KEYW.WITH":
 400                     //print('SCOPE-WITH:' + token.toString());
 401                     //println("<i>"+token.data+"</i>");
 402                     if (this.mode == "BUILDING_SYMBOL_TREE") {
 403                         // Inside a 'with' block, it is impossible to figure out
 404                         // statically whether a symbol is a local variable or an
 405                         // object member. As a consequence, the only thing we can
 406                         // do is turn the obfuscation off for the highest scope
 407                         // containing the 'with' block.
 408                         this.protectScopeFromObfuscation(thisScope);
 409                         this.warn("Using 'with' is not recommended." + (this.munge ? " Moreover, using 'with' reduces the level of compression!" : ""), true);
 410                     }
 411                     break;
 412
 413                 case "KEYW.CATCH":
 414                     //print('SCOPE-CATCH:' + token.toString());
 415                     //println("<i>"+token.data+"</i>");
 416                     this.parseCatch();
 417                     break;
 418                 /*
 419                 case Token.SPECIALCOMMENT:
 420                         if (mode == BUILDING_SYMBOL_TREE) {
 421                             protectScopeFromObfuscation(scope);
 422                             this.warn("Using JScript conditional comments is not recommended." + (munge ? " Moreover, using JScript conditional comments reduces the level of compression." : ""), true);
 423                         }
 424                         break;
 425                 */
 426
 427                 case "STRN.DOUBLE_QUOTE": // used for object lit detection..
 428                 case "STRN.SINGLE_QUOTE":
 429                   //  print('SCOPE-STRING:' + token.toString());
 430                     //println("<i>"+token.data+"</i>");
 431
 432                     if (this.ts.lookTok(-1).data == '{' && this.ts.lookTok(1).data == ':') {
 433                         // then we are in an object lit.. -> we need to flag the brace as such...
 434                         isObjectLitAr.pop();
 435                         isObjectLitAr.push(true);
 436                         //print(">>>>>> OBJLIT REPUSH(true)");
 437                     }
 438                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 439
 440                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ':' &&
 441                         ( this.ts.lookTok(-1).data == '{'  ||  this.ts.lookTok(-1).data == ':' )) {
 442                         // see if we can replace..
 443                         // remove the quotes..
 444                         // should do a bit more checking!!!! (what about wierd char's in the string..
 445                         var str = token.data.substring(1,token.data.length-1);
 446                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 447                             token.outData = str;
 448                         }
 449
 450
 451
 452                     }
 453
 454
 455
 456                     break;
 457
 458                 case "NAME.NAME":
 459                     //print('SCOPE-NAME:' + token.toString());
 460                     //print("DEAL WITH NAME:");
 461                     // got identifier..
 462
 463                     // look for  { ** : <- indicates obj literal.. ** this could occur with numbers ..
 464
 465
 466                     // skip anyting with "." before it..!!
 467
 468                     if (this.ts.lookTok(-1).data == ".") {
 469                         // skip, it's an object prop.
 470                         //println("<i>"+token.data+"</i>");
 471                         break;
 472                     }
 473                     //print("SYMBOL: " + token.toString());
 474
 475                     symbol = token.data;
 476                     if (symbol == 'this') {
 477                         break;
 478                     }
 479                     if (this.mode == 'PASS2_SYMBOL_TREE') {
 480
 481                         //println("GOT IDENT: -2 : " + this.ts.lookT(-2).toString() + " <BR> ..... -1 :  " +  this.ts.lookT(-1).toString() + " <BR> ");
 482
 483                         //print ("MUNGE?" + symbol);
 484
 485                         //println("GOT IDENT: <B>" + symbol + "</B><BR/>");
 486
 487                             //println("GOT IDENT (2): <B>" + symbol + "</B><BR/>");
 488                         identifier = this.getIdentifier(symbol, thisScope, token);
 489
 490                         if (identifier == false) {
 491 // BUG!find out where builtin is defined...
 492                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 493                                 // Here, we found an undeclared and un-namespaced symbol that is
 494                                 // 3 characters or less in length. Declare it in the global scope.
 495                                 // We don't need to declare longer symbols since they won't cause
 496                                 // any conflict with other munged symbols.
 497                                 this.globalScope.declareIdentifier(symbol, token);
 498                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 499                             }
 500
 501                             //println("GOT IDENT IGNORE(3): <B>" + symbol + "</B><BR/>");
 502                         } else {
 503                             token.identifier = identifier;
 504                             identifier.refcount++;
 505                         }
 506                     }
 507
 508                     break;
 509                     //println("<B>SID</B>");
 510                 default:
 511                     if (token.type != 'KEYW') {
 512                         break;
 513                     }
 514                     //print('SCOPE-KEYW:' + token.toString());
 515                    // print("Check eval:");
 516
 517                     symbol = token.data;
 518
 519                      if (this.mode == 'BUILDING_SYMBOL_TREE') {
 520
 521                         if (symbol == "eval") {
 522                             // look back one and see if we can find a comment!!!
 523                             if (this.ts.look(-1).type == "COMM") {
 524                                 // look for eval:var:noreplace\n
 525                                 var _t = this;
 526                                 this.ts.look(-1).data.replace(/eval:var:([a-z_]+)/ig, function(m, a) {
 527
 528                                     var hi = _t.getIdentifier(a, thisScope, token);
 529                                    // println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 530                                     if (hi) {
 531                                      //   println("PROTECT "+a+" from munge");
 532                                         hi.toMunge = false;
 533                                     }
 534
 535                                 });
 536
 537
 538                             } else {
 539
 540
 541                                 this.protectScopeFromObfuscation(thisScope);
 542                                 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);
 543                             }
 544
 545                         }
 546
 547                     }
 548                     break;
 549
 550
 551             } // end switch
 552
 553
 554             //print("parseScope TOK : " + token.toString());
 555             token = this.ts.nextTok();
 556             //if (this.ts.nextT()) break;
 557
 558         }
 559         //print("<<< EXIT SCOPE");
 560         //print("<<<<<<<EXIT SCOPE ERR?" +this.scopes.length);
 561     },
 562
 563     expN : 0,
 564     parseExpression : function() {
 565
 566         // Parse the expression until we encounter a comma or a semi-colon
 567         // in the same brace nesting, bracket nesting and paren nesting.
 568         // Parse functions if any...
 569         //println("<i>EXP</i><BR/>");
 570         !this.debug || print("PARSE EXPR");
 571         this.expN++;
 572
 573         // for printing stuff..
 574
 575
 576
 577         var symbol;
 578         var token;
 579         var currentScope;
 580         var identifier;
 581
 582         var expressionBraceNesting = this.braceNesting + 0;
 583         var bracketNesting = 0;
 584         var parensNesting = 0;
 585         var isInObjectLitAr;
 586         var isObjectLitAr = [ false ];
 587
 588         currentScope = this.scopes[this.scopes.length-1];
 589
 590
 591         //print(scopeIndent + ">> ENTER EXPRESSION" + this.expN);
 592         while (token = this.ts.nextTok()) {
 593
 594
 595
 596            /*
 597             // moved out of loop?
 598            currentScope = this.scopes[this.scopes.length-1];
 599
 600             var scopeIndent = '';
 601             this.scopes.forEach(function() {
 602                 scopeIndent += '   ';
 603             });
 604            */
 605
 606            //this.dumpToken(token,  this.scopes, this.braceNesting );
 607            //print('EXP' +  token.toString());
 608
 609
 610             //println("<i>"+token.data+"</i>");
 611             //this.log("EXP:" + token.data);
 612             switch (token.type) {
 613                 case 'PUNC':
 614                     //print("EXPR-PUNC:" + token.toString());
 615
 616                     switch(token.data) {
 617
 618                         case ';':
 619                             //print("<< EXIT EXPRESSION");
 620                             break;
 621
 622                         case ',':
 623
 624                             break;
 625
 626
 627                         case '(': //Token.LP:
 628                         case '{': //Token.LC:
 629                         case '[': //Token.LB:
 630                             //print('SCOPE-CURLY/PAREN/BRACE:' + token.toString());
 631                             //println("<i>"+token.data+"</i>");
 632                             var curTS = this.ts;
 633                             if (token.props) {
 634
 635                                 for (var prop in token.props) {
 636                                     if (token.props[prop].val.data == 'function') {
 637                                         // parse a function..
 638                                         this.parseFunctProp(token.props[prop]);
 639                                         continue;
 640                                     }
 641                                     // key value..
 642
 643                                     this.ts = new TokenStream(token.props[prop].val);
 644                                     this.parseScope(false);
 645
 646                                 }
 647                                 this.ts = curTS;
 648
 649                                 // it's an object literal..
 650                                 // the values could be replaced..
 651                                 break;
 652                             }
 653
 654
 655                             var _this = this;
 656                             token.items.forEach(function(expr) {
 657                                   _this.ts = new TokenStream(expr);
 658                                   _this.parseExpression()
 659                             });
 660                             this.ts = curTS;
 661
 662
 663
 664                             ///print(">>>>> EXP PUSH(false)"+this.braceNesting);
 665                             break;
 666
 667
 668
 669
 670
 671                         case ')': //Token.RP:
 672                         case ']': //Token.RB:
 673                         case '}': //Token.RB:
 674                             //print("<< EXIT EXPRESSION");
 675                             return;
 676
 677
 678
 679                             parensNesting++;
 680                             break;
 681
 682
 683
 684                     }
 685                     break;
 686
 687                 case 'STRN': // used for object lit detection..
 688                     //if (this.mode == 'BUILDING_SYMBOL_TREE')
 689                         //print("EXPR-STR:" + JSON.stringify(token, null, 4));
 690
 691
 692                     break;
 693
 694
 695
 696                 case 'NAME':
 697                     if (this.mode == 'BUILDING_SYMBOL_TREE') {
 698
 699                         //print("EXPR-NAME:" + JSON.stringify(token, null, 4));
 700                     } else {
 701                         //print("EXPR-NAME:" + token.toString());
 702                     }
 703                     symbol = token.data;
 704                     //print("in NAME = " + token.toString());
 705                     //print("in NAME 0: " + this.ts.look(0).toString());
 706                     //print("in NAME 2: " + this.ts.lookTok(2).toString());
 707
 708                     //print(this.ts.lookTok(-1).data);
 709                     // prefixed with '.'
 710                     if (this.ts.lookTok(-1).data == ".") {
 711                         //skip '.'
 712                         break;
 713                     }
 714                     if (symbol == 'this') {
 715                         break;
 716                        }
 717
 718                     if (this.mode == 'PASS2_SYMBOL_TREE') {
 719
 720                         identifier = this.getIdentifier(symbol, currentScope, token);
 721                         //println("<B>??</B>");
 722                         if (identifier == false) {
 723
 724                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 725                                 // Here, we found an undeclared and un-namespaced symbol that is
 726                                 // 3 characters or less in length. Declare it in the global scope.
 727                                 // We don't need to declare longer symbols since they won't cause
 728                                 // any conflict with other munged symbols.
 729                                 this.globalScope.declareIdentifier(symbol, token);
 730                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 731                                 //print("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')');
 732                                 //throw "OOPS";
 733                             } else {
 734                                 //print("undeclared:" + token.toString())
 735                             }
 736
 737
 738                         } else {
 739                             //println("<B>++</B>");
 740                             token.identifier = identifier;
 741                             identifier.refcount++;
 742                         }
 743
 744                     }
 745                     break;
 746
 747
 748
 749
 750                     //println("<B>EID</B>");
 751                 case 'KEYW':
 752                     //if (this.mode == 'BUILDING_SYMBOL_TREE')
 753                     //    print("EXPR-KEYW:" + JSON.stringify(token, null, 4));
 754                     if (token.name == "FUNCTION") {
 755
 756                         this.parseFunctionDeclaration();
 757                         break;
 758                     }
 759
 760
 761
 762                     symbol = token.data;
 763                     if (this.mode == 'BUILDING_SYMBOL_TREE') {
 764
 765                         if (symbol == "eval") {
 766                             if (this.ts.look(-1).type == 'COMM') {
 767                                 // look for eval:var:noreplace\n
 768                                 var _t = this;
 769                                 this.ts.look(-1).data.replace(/eval:var:([a-z]+)/ig, function(m, a) {
 770                                     var hi = _t.getIdentifier(a, currentScope, token);
 771                                    //println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 772                                     if (hi) {
 773                                       //  println("PROTECT "+a+" from munge");
 774                                         hi.toMunge = false;
 775                                     }
 776
 777
 778                                 });
 779
 780                             } else {
 781                                 this.protectScopeFromObfuscation(currentScope);
 782                                 this.warn("Using 'eval' is not recommended." + (this.munge ? " Moreover, using 'eval' reduces the level of compression!" : ""), true);
 783                             }
 784
 785
 786                         }
 787                         break;
 788                     }
 789                 default:
 790                     //if (this.mode == 'BUILDING_SYMBOL_TREE')
 791                     //    print("EXPR-SKIP:" + JSON.stringify(token, null, 4));
 792                     break;
 793             }
 794
 795         }
 796         //print("<< EXIT EXPRESSION");
 797         this.expN--;
 798     },
 799
 800
 801     parseCatch : function() {
 802
 803         var symbol;
 804         var token;
 805         var currentScope;
 806         var identifier;
 807
 808         //token = getToken(-1);
 809         //assert token.getType() == Token.CATCH;
 810         token = this.ts.nextTok();
 811         //assert token.getType() == Token.LP; (
 812         //token = this.ts.nextTok();
 813         //assert token.getType() == Token.NAME;
 814
 815         symbol = token.items[0].data;
 816         currentScope = this.scopes[this.scopes.length-1];
 817
 818         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 819             // We must declare the exception identifier in the containing function
 820             // scope to avoid errors related to the obfuscation process. No need to
 821             // display a warning if the symbol was already declared here...
 822             currentScope.declareIdentifier(symbol, token);
 823         } else {
 824             //?? why inc the refcount?? - that should be set when building the tree???
 825             identifier = this.getIdentifier(symbol, currentScope, token);
 826             identifier.refcount++;
 827         }
 828
 829         token = this.ts.nextTok();
 830         //assert token.getType() == Token.RP; // )
 831     },
 832
 833     parseFunctionDeclaration : function()
 834     {
 835         //print("PARSE FUNCTION");
 836         var symbol;
 837         var token;
 838         var currentScope  = false;
 839         var fnScope = false;
 840         var identifier;
 841         var b4braceNesting = this.braceNesting + 0;
 842
 843         //this.logR("<B>PARSING FUNCTION</B>");
 844         currentScope = this.scopes[this.scopes.length-1];
 845
 846         token = this.ts.nextTok();
 847         if (token.type == "NAME") {
 848             if (this.mode == 'BUILDING_SYMBOL_TREE') {
 849                 // Get the name of the function and declare it in the current scope.
 850                 symbol = token.data;
 851                 if (currentScope.getIdentifier(symbol,token) != false) {
 852                     this.warn("The function " + symbol + " has already been declared in the same scope...", true);
 853                 }
 854                 currentScope.declareIdentifier(symbol,token);
 855             }
 856             token =  this.ts.nextTok();
 857         }
 858
 859         //assert token.getType() == Token.LP;
 860         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 861             fnScope = new Scope(1, currentScope, token.n, '');
 862
 863             //println("STORING SCOPE" + this.ts.cursor);
 864
 865             this.indexedScopes[token.id] = fnScope;
 866
 867         } else {
 868             //qln("FETCHING SCOPE" + this.ts.cursor);
 869             fnScope = this.indexedScopes[token.id];
 870
 871         }
 872         //if (this.mode == 'BUILDING_SYMBOL_TREE')
 873         //    print('FUNC-PARSE:' + JSON.stringify(token,null,4));
 874         // Parse function arguments.
 875         var args = token.items;
 876         for (var argpos =0; argpos < args.length; argpos++) {
 877
 878             token = args[argpos][0];
 879             //print ("FUNC ARGS: " + token.toString())
 880             //assert token.getType() == Token.NAME ||
 881             //        token.getType() == Token.COMMA;
 882             if (token.type == 'NAME' && this.mode == 'BUILDING_SYMBOL_TREE') {
 883                 symbol = token.data;
 884                 identifier = fnScope.declareIdentifier(symbol,token);
 885                 if (symbol == "$super" && argpos == 0) {
 886                     // Exception for Prototype 1.6...
 887                     identifier.preventMunging();
 888                 }
 889                 //argpos++;
 890             }
 891         }
 892
 893         token = this.ts.nextTok();
 894         //print('FUNC-BODY:' + JSON.stringify(token.items,null,4));
 895         //Seed.quit();
 896         //print(token.toString());
 897         // assert token.getType() == Token.LC;
 898         //this.braceNesting++;
 899
 900         //token = this.ts.nextTok();
 901         //print(token.toString());
 902         var outTS = this.ts;
 903         var _this = this;
 904         token.items.forEach(function(tar) {
 905             _this.ts = new TokenStream(tar);
 906             _this.parseScope(fnScope);
 907
 908
 909         });
 910
 911         //print(JSON.stringify(this.ts,null,4));
 912         //this.parseScope(fnScope);
 913         this.ts = outTS;
 914         // now pop it off the stack!!!
 915
 916         //this.braceNesting = b4braceNesting;
 917         //print("ENDFN -1: " + this.ts.lookTok(-1).toString());
 918         //print("ENDFN 0: " + this.ts.lookTok(0).toString());
 919         //print("ENDFN 1: " + this.ts.lookTok(1).toString());
 920     },
 921
 922     protectScopeFromObfuscation : function(scope) {
 923             //assert scope != null;
 924
 925         if (scope == this.globalScope) {
 926             // The global scope does not get obfuscated,
 927             // so we don't need to worry about it...
 928             return;
 929         }
 930
 931         // Find the highest local scope containing the specified scope.
 932         while (scope && scope.parent != this.globalScope) {
 933             scope = scope.parent;
 934         }
 935
 936         //assert scope.getParentScope() == globalScope;
 937         scope.preventMunging();
 938     },
 939
 940     getIdentifier: function(symbol, scope, token) {
 941         var identifier;
 942         while (scope != false) {
 943             identifier = scope.getIdentifier(symbol, token);
 944             //println("ScopeParser.getIdentgetUsedSymbols("+symbol+")=" + scope.getUsedSymbols().join(','));
 945             if (identifier) {
 946                 return identifier;
 947             }
 948             scope = scope.parent;
 949         }
 950         return false;
 951     }
 952 };