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                 case "PUNC.LEFT_BRACE": // [
 332                     //print('SCOPE-CURLY/PAREN:' + token.toString());
 333                     //println("<i>"+token.data+"</i>");
 334                     var curTS = this.ts;
 335                     if (token.props) {
 336
 337                         for (var prop in token.props) {
 338
 339
 340                           //  print('SCOPE-PROPS:' + JSON.stringify(token.props[prop],null,4));
 341                             if (token.props[prop].val[0].data == 'function') {
 342                                 // parse a function..
 343                                 this.ts = new TokenStream(token.props[prop].val);
 344                                 this.ts.nextTok();
 345                                 this.parseFunctionDeclaration();
 346
 347                                 continue;
 348                             }
 349                             // key value..
 350
 351                             this.ts = new TokenStream(token.props[prop].val);
 352                             this.parseExpression();
 353
 354                         }
 355                         this.ts = curTS;
 356
 357                         // it's an object literal..
 358                         // the values could be replaced..
 359                         break;
 360                     }
 361
 362
 363                     var _this = this;
 364                     token.items.forEach(function(expr) {
 365                           _this.ts = new TokenStream(expr);
 366                           _this.parseExpression()
 367                     });
 368                     this.ts = curTS;
 369                     //print("NOT PROPS"); Seed.quit();
 370
 371                     //isObjectLitAr.push(false);
 372                     //this.braceNesting++;
 373
 374                     //print(">>>>>> OBJLIT PUSH(false)" + this.braceNesting);
 375                     break;
 376
 377                 case "PUNC.RIGHT_CURLY": // }
 378                     //print("<< EXIT SCOPE");
 379                     return;
 380                 /*
 381                     //println("<i>"+token.data+"</i>");
 382                     this.braceNesting--;
 383                     isObjectLitAr.pop();
 384                     //print(">>>>>> OBJLIT POP"+ this.braceNesting);
 385                         //assert braceNesting >= scope.getBra ceNesting();
 386
 387                     if (this.braceNesting < expressionBraceNesting) {
 388                         var ls = this.scopes.pop();
 389                         ls.getUsedSymbols();
 390                         // eat symbol if we are currently at {
 391                         if (this.ts.look(0).data == '{') {
 392                             this.ts.nextTok();
 393                         }
 394
 395                         print("<<<<<<<EXIT SCOPE" +this.scopes.length);
 396                         return;
 397                     }
 398                     break;
 399 */
 400                 case "KEYW.WITH":
 401                     //print('SCOPE-WITH:' + token.toString());
 402                     //println("<i>"+token.data+"</i>");
 403                     if (this.mode == "BUILDING_SYMBOL_TREE") {
 404                         // Inside a 'with' block, it is impossible to figure out
 405                         // statically whether a symbol is a local variable or an
 406                         // object member. As a consequence, the only thing we can
 407                         // do is turn the obfuscation off for the highest scope
 408                         // containing the 'with' block.
 409                         this.protectScopeFromObfuscation(thisScope);
 410                         this.warn("Using 'with' is not recommended." + (this.munge ? " Moreover, using 'with' reduces the level of compression!" : ""), true);
 411                     }
 412                     break;
 413
 414                 case "KEYW.CATCH":
 415                     //print('SCOPE-CATCH:' + token.toString());
 416                     //println("<i>"+token.data+"</i>");
 417                     this.parseCatch();
 418                     break;
 419                 /*
 420                 case Token.SPECIALCOMMENT:
 421                         if (mode == BUILDING_SYMBOL_TREE) {
 422                             protectScopeFromObfuscation(scope);
 423                             this.warn("Using JScript conditional comments is not recommended." + (munge ? " Moreover, using JScript conditional comments reduces the level of compression." : ""), true);
 424                         }
 425                         break;
 426                 */
 427
 428                 case "STRN.DOUBLE_QUOTE": // used for object lit detection..
 429                 case "STRN.SINGLE_QUOTE":
 430                   //  print('SCOPE-STRING:' + token.toString());
 431                     //println("<i>"+token.data+"</i>");
 432
 433                     if (this.ts.lookTok(-1).data == '{' && this.ts.lookTok(1).data == ':') {
 434                         // then we are in an object lit.. -> we need to flag the brace as such...
 435                         isObjectLitAr.pop();
 436                         isObjectLitAr.push(true);
 437                         //print(">>>>>> OBJLIT REPUSH(true)");
 438                     }
 439                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 440
 441                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ':' &&
 442                         ( this.ts.lookTok(-1).data == '{'  ||  this.ts.lookTok(-1).data == ':' )) {
 443                         // see if we can replace..
 444                         // remove the quotes..
 445                         // should do a bit more checking!!!! (what about wierd char's in the string..
 446                         var str = token.data.substring(1,token.data.length-1);
 447                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 448                             token.outData = str;
 449                         }
 450
 451
 452
 453                     }
 454
 455
 456
 457                     break;
 458
 459                 case "NAME.NAME":
 460                     //print('SCOPE-NAME:' + token.toString());
 461                     //print("DEAL WITH NAME:");
 462                     // got identifier..
 463
 464                     // look for  { ** : <- indicates obj literal.. ** this could occur with numbers ..
 465
 466
 467                     // skip anyting with "." before it..!!
 468
 469                     if (this.ts.lookTok(-1).data == ".") {
 470                         // skip, it's an object prop.
 471                         //println("<i>"+token.data+"</i>");
 472                         break;
 473                     }
 474                     //print("SYMBOL: " + token.toString());
 475
 476                     symbol = token.data;
 477                     if (symbol == 'this') {
 478                         break;
 479                     }
 480                     if (this.mode == 'PASS2_SYMBOL_TREE') {
 481
 482                         //println("GOT IDENT: -2 : " + this.ts.lookT(-2).toString() + " <BR> ..... -1 :  " +  this.ts.lookT(-1).toString() + " <BR> ");
 483
 484                         //print ("MUNGE?" + symbol);
 485
 486                         //println("GOT IDENT: <B>" + symbol + "</B><BR/>");
 487
 488                             //println("GOT IDENT (2): <B>" + symbol + "</B><BR/>");
 489                         identifier = this.getIdentifier(symbol, thisScope, token);
 490
 491                         if (identifier == false) {
 492 // BUG!find out where builtin is defined...
 493                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 494                                 // Here, we found an undeclared and un-namespaced symbol that is
 495                                 // 3 characters or less in length. Declare it in the global scope.
 496                                 // We don't need to declare longer symbols since they won't cause
 497                                 // any conflict with other munged symbols.
 498                                 this.globalScope.declareIdentifier(symbol, token);
 499                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 500                             }
 501
 502                             //println("GOT IDENT IGNORE(3): <B>" + symbol + "</B><BR/>");
 503                         } else {
 504                             token.identifier = identifier;
 505                             identifier.refcount++;
 506                         }
 507                     }
 508
 509                     break;
 510                     //println("<B>SID</B>");
 511                 default:
 512                     if (token.type != 'KEYW') {
 513                         break;
 514                     }
 515                     //print('SCOPE-KEYW:' + token.toString());
 516                    // print("Check eval:");
 517
 518                     symbol = token.data;
 519
 520                      if (this.mode == 'BUILDING_SYMBOL_TREE') {
 521
 522                         if (symbol == "eval") {
 523                             // look back one and see if we can find a comment!!!
 524                             //if (this.ts.look(-1).type == "COMM") {
 525                             if (token.prefix && token.prefix.match('/eval/')) {
 526                                 // look for eval:var:noreplace\n
 527                                 var _t = this;
 528                                 token.prefix.replace(/eval:var:([a-z_]+)/ig, function(m, a) {
 529
 530                                     var hi = _t.getIdentifier(a, thisScope, token);
 531                                    // println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 532                                     if (hi) {
 533                                      //   println("PROTECT "+a+" from munge");
 534                                         hi.toMunge = false;
 535                                     }
 536
 537                                 });
 538
 539
 540                             } else {
 541
 542
 543                                 this.protectScopeFromObfuscation(thisScope);
 544                                 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);
 545                             }
 546
 547                         }
 548
 549                     }
 550                     break;
 551
 552
 553             } // end switch
 554
 555
 556             //print("parseScope TOK : " + token.toString());
 557             token = this.ts.nextTok();
 558             //if (this.ts.nextT()) break;
 559
 560         }
 561         //print("<<< EXIT SCOPE");
 562         //print("<<<<<<<EXIT SCOPE ERR?" +this.scopes.length);
 563     },
 564
 565     expN : 0,
 566     parseExpression : function() {
 567
 568         // Parse the expression until we encounter a comma or a semi-colon
 569         // in the same brace nesting, bracket nesting and paren nesting.
 570         // Parse functions if any...
 571         //println("<i>EXP</i><BR/>");
 572         !this.debug || print("PARSE EXPR");
 573         this.expN++;
 574
 575         // for printing stuff..
 576
 577
 578
 579         var symbol;
 580         var token;
 581         var currentScope;
 582         var identifier;
 583
 584         var expressionBraceNesting = this.braceNesting + 0;
 585         var bracketNesting = 0;
 586         var parensNesting = 0;
 587         var isInObjectLitAr;
 588         var isObjectLitAr = [ false ];
 589
 590         currentScope = this.scopes[this.scopes.length-1];
 591
 592
 593         //print(scopeIndent + ">> ENTER EXPRESSION" + this.expN);
 594         while (token = this.ts.nextTok()) {
 595
 596
 597
 598            /*
 599             // moved out of loop?
 600            currentScope = this.scopes[this.scopes.length-1];
 601
 602             var scopeIndent = '';
 603             this.scopes.forEach(function() {
 604                 scopeIndent += '   ';
 605             });
 606            */
 607
 608            //this.dumpToken(token,  this.scopes, this.braceNesting );
 609            //print('EXP' +  token.toString());
 610
 611
 612             //println("<i>"+token.data+"</i>");
 613             //this.log("EXP:" + token.data);
 614             switch (token.type) {
 615                 case 'PUNC':
 616                     //print("EXPR-PUNC:" + token.toString());
 617
 618                     switch(token.data) {
 619
 620                         case ';':
 621                             //print("<< EXIT EXPRESSION");
 622                             break;
 623
 624                         case ',':
 625
 626                             break;
 627
 628
 629                         case '(': //Token.LP:
 630                         case '{': //Token.LC:
 631                         case '[': //Token.LB:
 632                             //print('SCOPE-CURLY/PAREN/BRACE:' + token.toString());
 633                            // print('SCOPE-CURLY/PAREN/BRACE:' + JSON.stringify(token, null,4));
 634                             //println("<i>"+token.data+"</i>");
 635                             var curTS = this.ts;
 636                             if (token.props) {
 637
 638                                 for (var prop in token.props) {
 639                                     if (token.props[prop].val[0].data == 'function') {
 640                                         // parse a function..
 641                                         this.ts = new TokenStream(token.props[prop].val);
 642                                         this.ts.nextTok();
 643                                         this.parseFunctionDeclaration();
 644                                         continue;
 645                                     }
 646                                     // key value..
 647
 648                                     this.ts = new TokenStream(token.props[prop].val);
 649                                     this.parseExpression();
 650
 651                                 }
 652                                 this.ts = curTS;
 653
 654                                 // it's an object literal..
 655                                 // the values could be replaced..
 656                                 break;
 657                             }
 658
 659
 660                             var _this = this;
 661                             token.items.forEach(function(expr) {
 662                                   _this.ts = new TokenStream(expr);
 663                                   _this.parseExpression()
 664                             });
 665                             this.ts = curTS;
 666
 667
 668
 669                             ///print(">>>>> EXP PUSH(false)"+this.braceNesting);
 670                             break;
 671
 672
 673
 674
 675
 676                         case ')': //Token.RP:
 677                         case ']': //Token.RB:
 678                         case '}': //Token.RB:
 679                             //print("<< EXIT EXPRESSION");
 680                             return;
 681
 682
 683
 684                             parensNesting++;
 685                             break;
 686
 687
 688
 689                     }
 690                     break;
 691
 692                 case 'STRN': // used for object lit detection..
 693                     //if (this.mode == 'BUILDING_SYMBOL_TREE')
 694                         //print("EXPR-STR:" + JSON.stringify(token, null, 4));
 695
 696
 697                     break;
 698
 699
 700
 701                 case 'NAME':
 702                     if (this.mode == 'BUILDING_SYMBOL_TREE') {
 703
 704                         //print("EXPR-NAME:" + JSON.stringify(token, null, 4));
 705                     } else {
 706                         //print("EXPR-NAME:" + token.toString());
 707                     }
 708                     symbol = token.data;
 709                     //print("in NAME = " + token.toString());
 710                     //print("in NAME 0: " + this.ts.look(0).toString());
 711                     //print("in NAME 2: " + this.ts.lookTok(2).toString());
 712
 713                     //print(this.ts.lookTok(-1).data);
 714                     // prefixed with '.'
 715                     if (this.ts.lookTok(-1).data == ".") {
 716                         //skip '.'
 717                         break;
 718                     }
 719                     if (symbol == 'this') {
 720                         break;
 721                        }
 722
 723                     if (this.mode == 'PASS2_SYMBOL_TREE') {
 724
 725                         identifier = this.getIdentifier(symbol, currentScope, token);
 726                         //println("<B>??</B>");
 727                         if (identifier == false) {
 728
 729                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 730                                 // Here, we found an undeclared and un-namespaced symbol that is
 731                                 // 3 characters or less in length. Declare it in the global scope.
 732                                 // We don't need to declare longer symbols since they won't cause
 733                                 // any conflict with other munged symbols.
 734                                 this.globalScope.declareIdentifier(symbol, token);
 735                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 736                                 //print("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')');
 737                                 //throw "OOPS";
 738                             } else {
 739                                 //print("undeclared:" + token.toString())
 740                             }
 741
 742
 743                         } else {
 744                             //println("<B>++</B>");
 745                             token.identifier = identifier;
 746                             identifier.refcount++;
 747                         }
 748
 749                     }
 750                     break;
 751
 752
 753
 754
 755                     //println("<B>EID</B>");
 756                 case 'KEYW':
 757                     //if (this.mode == 'BUILDING_SYMBOL_TREE')
 758                     //    print("EXPR-KEYW:" + JSON.stringify(token, null, 4));
 759                     if (token.name == "FUNCTION") {
 760
 761                         this.parseFunctionDeclaration();
 762                         break;
 763                     }
 764
 765
 766
 767                     symbol = token.data;
 768                     if (this.mode == 'BUILDING_SYMBOL_TREE') {
 769
 770                         if (symbol == "eval") {
 771                             if (token.prefix && token.prefix.match('/eval/')) {
 772                                 // look for eval:var:noreplace\n
 773                                 var _t = this;
 774                                 token.prefix.replace(/eval:var:([a-z]+)/ig, function(m, a) {
 775                                     var hi = _t.getIdentifier(a, currentScope, token);
 776                                    //println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 777                                     if (hi) {
 778                                       //  println("PROTECT "+a+" from munge");
 779                                         hi.toMunge = false;
 780                                     }
 781
 782
 783                                 });
 784
 785                             } else {
 786                                 this.protectScopeFromObfuscation(currentScope);
 787                                 this.warn("Using 'eval' is not recommended." + (this.munge ? " Moreover, using 'eval' reduces the level of compression!" : ""), true);
 788                             }
 789
 790
 791                         }
 792                         break;
 793                     }
 794                 default:
 795                     //if (this.mode == 'BUILDING_SYMBOL_TREE')
 796                     //    print("EXPR-SKIP:" + JSON.stringify(token, null, 4));
 797                     break;
 798             }
 799
 800         }
 801         //print("<< EXIT EXPRESSION");
 802         this.expN--;
 803     },
 804
 805
 806     parseCatch : function() {
 807
 808         var symbol;
 809         var token;
 810         var currentScope;
 811         var identifier;
 812
 813         //token = getToken(-1);
 814         //assert token.getType() == Token.CATCH;
 815         token = this.ts.nextTok();
 816         //assert token.getType() == Token.LP; (
 817         //token = this.ts.nextTok();
 818         //assert token.getType() == Token.NAME;
 819
 820         symbol = token.items[0].data;
 821         currentScope = this.scopes[this.scopes.length-1];
 822
 823         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 824             // We must declare the exception identifier in the containing function
 825             // scope to avoid errors related to the obfuscation process. No need to
 826             // display a warning if the symbol was already declared here...
 827             currentScope.declareIdentifier(symbol, token);
 828         } else {
 829             //?? why inc the refcount?? - that should be set when building the tree???
 830             identifier = this.getIdentifier(symbol, currentScope, token);
 831             identifier.refcount++;
 832         }
 833
 834         token = this.ts.nextTok();
 835         //assert token.getType() == Token.RP; // )
 836     },
 837
 838     parseFunctionDeclaration : function()
 839     {
 840         //print("PARSE FUNCTION");
 841         var symbol;
 842         var token;
 843         var currentScope  = false;
 844         var fnScope = false;
 845         var identifier;
 846         var b4braceNesting = this.braceNesting + 0;
 847
 848         //this.logR("<B>PARSING FUNCTION</B>");
 849         currentScope = this.scopes[this.scopes.length-1];
 850
 851         token = this.ts.nextTok();
 852         if (token.type == "NAME") {
 853             if (this.mode == 'BUILDING_SYMBOL_TREE') {
 854                 // Get the name of the function and declare it in the current scope.
 855                 symbol = token.data;
 856                 if (currentScope.getIdentifier(symbol,token) != false) {
 857                     this.warn("The function " + symbol + " has already been declared in the same scope...", true);
 858                 }
 859                 currentScope.declareIdentifier(symbol,token);
 860             }
 861             token =  this.ts.nextTok();
 862         }
 863         // return function() {....
 864         if (token.name == "RETURN") {
 865             token =  this.ts.nextTok();
 866         }
 867
 868         //assert token.getType() == Token.LP;
 869         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 870             fnScope = new Scope(1, currentScope, token.n, '', token);
 871
 872             //println("STORING SCOPE" + this.ts.cursor);
 873
 874             this.indexedScopes[token.id] = fnScope;
 875
 876         } else {
 877             //qln("FETCHING SCOPE" + this.ts.cursor);
 878             fnScope = this.indexedScopes[token.id];
 879         }
 880         //if (this.mode == 'BUILDING_SYMBOL_TREE')
 881             print('FUNC-PARSE:' + JSON.stringify(token,null,4));
 882         // Parse function arguments.
 883         var args = token.items;
 884         for (var argpos =0; argpos < args.length; argpos++) {
 885
 886             token = args[argpos][0];
 887             //print ("FUNC ARGS: " + token.toString())
 888             //assert token.getType() == Token.NAME ||
 889             //        token.getType() == Token.COMMA;
 890             if (token.type == 'NAME' && this.mode == 'BUILDING_SYMBOL_TREE') {
 891                 symbol = token.data;
 892                 identifier = fnScope.declareIdentifier(symbol,token);
 893                 if (symbol == "$super" && argpos == 0) {
 894                     // Exception for Prototype 1.6...
 895                     identifier.preventMunging();
 896                 }
 897                 //argpos++;
 898             }
 899         }
 900
 901         token = this.ts.nextTok();
 902         //print('FUNC-BODY:' + JSON.stringify(token.items,null,4));
 903         //Seed.quit();
 904         //print(token.toString());
 905         // assert token.getType() == Token.LC;
 906         //this.braceNesting++;
 907
 908         //token = this.ts.nextTok();
 909         //print(token.toString());
 910         var outTS = this.ts;
 911         var _this = this;
 912         token.items.forEach(function(tar) {
 913             _this.ts = new TokenStream(tar);
 914             _this.parseScope(fnScope);
 915
 916
 917         });
 918
 919         //print(JSON.stringify(this.ts,null,4));
 920         //this.parseScope(fnScope);
 921         this.ts = outTS;
 922         // now pop it off the stack!!!
 923
 924         //this.braceNesting = b4braceNesting;
 925         //print("ENDFN -1: " + this.ts.lookTok(-1).toString());
 926         //print("ENDFN 0: " + this.ts.lookTok(0).toString());
 927         //print("ENDFN 1: " + this.ts.lookTok(1).toString());
 928     },
 929
 930     protectScopeFromObfuscation : function(scope) {
 931             //assert scope != null;
 932
 933         if (scope == this.globalScope) {
 934             // The global scope does not get obfuscated,
 935             // so we don't need to worry about it...
 936             return;
 937         }
 938
 939         // Find the highest local scope containing the specified scope.
 940         while (scope && scope.parent != this.globalScope) {
 941             scope = scope.parent;
 942         }
 943
 944         //assert scope.getParentScope() == globalScope;
 945         scope.preventMunging();
 946     },
 947
 948     getIdentifier: function(symbol, scope, token) {
 949         var identifier;
 950         while (scope != false) {
 951             identifier = scope.getIdentifier(symbol, token);
 952             //println("ScopeParser.getIdentgetUsedSymbols("+symbol+")=" + scope.getUsedSymbols().join(','));
 953             if (identifier) {
 954                 return identifier;
 955             }
 956             scope = scope.parent;
 957         }
 958         return false;
 959     }
 960 };