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                                 // look for eval:var:noreplace\n
 526                                 var _t = this;
 527                                 this.ts.look(-1).data.replace(/eval:var:([a-z_]+)/ig, function(m, a) {
 528
 529                                     var hi = _t.getIdentifier(a, thisScope, token);
 530                                    // println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 531                                     if (hi) {
 532                                      //   println("PROTECT "+a+" from munge");
 533                                         hi.toMunge = false;
 534                                     }
 535
 536                                 });
 537
 538
 539                             } else {
 540
 541
 542                                 this.protectScopeFromObfuscation(thisScope);
 543                                 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);
 544                             }
 545
 546                         }
 547
 548                     }
 549                     break;
 550
 551
 552             } // end switch
 553
 554
 555             //print("parseScope TOK : " + token.toString());
 556             token = this.ts.nextTok();
 557             //if (this.ts.nextT()) break;
 558
 559         }
 560         //print("<<< EXIT SCOPE");
 561         //print("<<<<<<<EXIT SCOPE ERR?" +this.scopes.length);
 562     },
 563
 564     expN : 0,
 565     parseExpression : function() {
 566
 567         // Parse the expression until we encounter a comma or a semi-colon
 568         // in the same brace nesting, bracket nesting and paren nesting.
 569         // Parse functions if any...
 570         //println("<i>EXP</i><BR/>");
 571         !this.debug || print("PARSE EXPR");
 572         this.expN++;
 573
 574         // for printing stuff..
 575
 576
 577
 578         var symbol;
 579         var token;
 580         var currentScope;
 581         var identifier;
 582
 583         var expressionBraceNesting = this.braceNesting + 0;
 584         var bracketNesting = 0;
 585         var parensNesting = 0;
 586         var isInObjectLitAr;
 587         var isObjectLitAr = [ false ];
 588
 589         currentScope = this.scopes[this.scopes.length-1];
 590
 591
 592         //print(scopeIndent + ">> ENTER EXPRESSION" + this.expN);
 593         while (token = this.ts.nextTok()) {
 594
 595
 596
 597            /*
 598             // moved out of loop?
 599            currentScope = this.scopes[this.scopes.length-1];
 600
 601             var scopeIndent = '';
 602             this.scopes.forEach(function() {
 603                 scopeIndent += '   ';
 604             });
 605            */
 606
 607            //this.dumpToken(token,  this.scopes, this.braceNesting );
 608            //print('EXP' +  token.toString());
 609
 610
 611             //println("<i>"+token.data+"</i>");
 612             //this.log("EXP:" + token.data);
 613             switch (token.type) {
 614                 case 'PUNC':
 615                     //print("EXPR-PUNC:" + token.toString());
 616
 617                     switch(token.data) {
 618
 619                         case ';':
 620                             //print("<< EXIT EXPRESSION");
 621                             break;
 622
 623                         case ',':
 624
 625                             break;
 626
 627
 628                         case '(': //Token.LP:
 629                         case '{': //Token.LC:
 630                         case '[': //Token.LB:
 631                             print('SCOPE-CURLY/PAREN/BRACE:' + token.toString());
 632                            // print('SCOPE-CURLY/PAREN/BRACE:' + JSON.stringify(token, null,4));
 633                             //println("<i>"+token.data+"</i>");
 634                             var curTS = this.ts;
 635                             if (token.props) {
 636
 637                                 for (var prop in token.props) {
 638                                     if (token.props[prop].val[0].data == 'function') {
 639                                         // parse a function..
 640                                         this.ts = new TokenStream(token.props[prop].val);
 641                                         this.ts.nextTok();
 642                                         this.parseFunctionDeclaration();
 643                                         continue;
 644                                     }
 645                                     // key value..
 646
 647                                     this.ts = new TokenStream(token.props[prop].val);
 648                                     this.parseExpression();
 649
 650                                 }
 651                                 this.ts = curTS;
 652
 653                                 // it's an object literal..
 654                                 // the values could be replaced..
 655                                 break;
 656                             }
 657
 658
 659                             var _this = this;
 660                             token.items.forEach(function(expr) {
 661                                   _this.ts = new TokenStream(expr);
 662                                   _this.parseExpression()
 663                             });
 664                             this.ts = curTS;
 665
 666
 667
 668                             ///print(">>>>> EXP PUSH(false)"+this.braceNesting);
 669                             break;
 670
 671
 672
 673
 674
 675                         case ')': //Token.RP:
 676                         case ']': //Token.RB:
 677                         case '}': //Token.RB:
 678                             //print("<< EXIT EXPRESSION");
 679                             return;
 680
 681
 682
 683                             parensNesting++;
 684                             break;
 685
 686
 687
 688                     }
 689                     break;
 690
 691                 case 'STRN': // used for object lit detection..
 692                     //if (this.mode == 'BUILDING_SYMBOL_TREE')
 693                         //print("EXPR-STR:" + JSON.stringify(token, null, 4));
 694
 695
 696                     break;
 697
 698
 699
 700                 case 'NAME':
 701                     if (this.mode == 'BUILDING_SYMBOL_TREE') {
 702
 703                         //print("EXPR-NAME:" + JSON.stringify(token, null, 4));
 704                     } else {
 705                         //print("EXPR-NAME:" + token.toString());
 706                     }
 707                     symbol = token.data;
 708                     //print("in NAME = " + token.toString());
 709                     //print("in NAME 0: " + this.ts.look(0).toString());
 710                     //print("in NAME 2: " + this.ts.lookTok(2).toString());
 711
 712                     //print(this.ts.lookTok(-1).data);
 713                     // prefixed with '.'
 714                     if (this.ts.lookTok(-1).data == ".") {
 715                         //skip '.'
 716                         break;
 717                     }
 718                     if (symbol == 'this') {
 719                         break;
 720                        }
 721
 722                     if (this.mode == 'PASS2_SYMBOL_TREE') {
 723
 724                         identifier = this.getIdentifier(symbol, currentScope, token);
 725                         //println("<B>??</B>");
 726                         if (identifier == false) {
 727
 728                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 729                                 // Here, we found an undeclared and un-namespaced symbol that is
 730                                 // 3 characters or less in length. Declare it in the global scope.
 731                                 // We don't need to declare longer symbols since they won't cause
 732                                 // any conflict with other munged symbols.
 733                                 this.globalScope.declareIdentifier(symbol, token);
 734                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 735                                 //print("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')');
 736                                 //throw "OOPS";
 737                             } else {
 738                                 //print("undeclared:" + token.toString())
 739                             }
 740
 741
 742                         } else {
 743                             //println("<B>++</B>");
 744                             token.identifier = identifier;
 745                             identifier.refcount++;
 746                         }
 747
 748                     }
 749                     break;
 750
 751
 752
 753
 754                     //println("<B>EID</B>");
 755                 case 'KEYW':
 756                     //if (this.mode == 'BUILDING_SYMBOL_TREE')
 757                     //    print("EXPR-KEYW:" + JSON.stringify(token, null, 4));
 758                     if (token.name == "FUNCTION") {
 759
 760                         this.parseFunctionDeclaration();
 761                         break;
 762                     }
 763
 764
 765
 766                     symbol = token.data;
 767                     if (this.mode == 'BUILDING_SYMBOL_TREE') {
 768
 769                         if (symbol == "eval") {
 770                             if (this.ts.look(-1).type == 'COMM') {
 771                                 // look for eval:var:noreplace\n
 772                                 var _t = this;
 773                                 this.ts.look(-1).data.replace(/eval:var:([a-z]+)/ig, function(m, a) {
 774                                     var hi = _t.getIdentifier(a, currentScope, token);
 775                                    //println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 776                                     if (hi) {
 777                                       //  println("PROTECT "+a+" from munge");
 778                                         hi.toMunge = false;
 779                                     }
 780
 781
 782                                 });
 783
 784                             } else {
 785                                 this.protectScopeFromObfuscation(currentScope);
 786                                 this.warn("Using 'eval' is not recommended." + (this.munge ? " Moreover, using 'eval' reduces the level of compression!" : ""), true);
 787                             }
 788
 789
 790                         }
 791                         break;
 792                     }
 793                 default:
 794                     //if (this.mode == 'BUILDING_SYMBOL_TREE')
 795                     //    print("EXPR-SKIP:" + JSON.stringify(token, null, 4));
 796                     break;
 797             }
 798
 799         }
 800         //print("<< EXIT EXPRESSION");
 801         this.expN--;
 802     },
 803
 804
 805     parseCatch : function() {
 806
 807         var symbol;
 808         var token;
 809         var currentScope;
 810         var identifier;
 811
 812         //token = getToken(-1);
 813         //assert token.getType() == Token.CATCH;
 814         token = this.ts.nextTok();
 815         //assert token.getType() == Token.LP; (
 816         //token = this.ts.nextTok();
 817         //assert token.getType() == Token.NAME;
 818
 819         symbol = token.items[0].data;
 820         currentScope = this.scopes[this.scopes.length-1];
 821
 822         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 823             // We must declare the exception identifier in the containing function
 824             // scope to avoid errors related to the obfuscation process. No need to
 825             // display a warning if the symbol was already declared here...
 826             currentScope.declareIdentifier(symbol, token);
 827         } else {
 828             //?? why inc the refcount?? - that should be set when building the tree???
 829             identifier = this.getIdentifier(symbol, currentScope, token);
 830             identifier.refcount++;
 831         }
 832
 833         token = this.ts.nextTok();
 834         //assert token.getType() == Token.RP; // )
 835     },
 836
 837     parseFunctionDeclaration : function()
 838     {
 839         //print("PARSE FUNCTION");
 840         var symbol;
 841         var token;
 842         var currentScope  = false;
 843         var fnScope = false;
 844         var identifier;
 845         var b4braceNesting = this.braceNesting + 0;
 846
 847         //this.logR("<B>PARSING FUNCTION</B>");
 848         currentScope = this.scopes[this.scopes.length-1];
 849
 850         token = this.ts.nextTok();
 851         if (token.type == "NAME") {
 852             if (this.mode == 'BUILDING_SYMBOL_TREE') {
 853                 // Get the name of the function and declare it in the current scope.
 854                 symbol = token.data;
 855                 if (currentScope.getIdentifier(symbol,token) != false) {
 856                     this.warn("The function " + symbol + " has already been declared in the same scope...", true);
 857                 }
 858                 currentScope.declareIdentifier(symbol,token);
 859             }
 860             token =  this.ts.nextTok();
 861         }
 862
 863         //assert token.getType() == Token.LP;
 864         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 865             fnScope = new Scope(1, currentScope, token.n, '', token);
 866
 867             //println("STORING SCOPE" + this.ts.cursor);
 868
 869             this.indexedScopes[token.id] = fnScope;
 870
 871         } else {
 872             //qln("FETCHING SCOPE" + this.ts.cursor);
 873             fnScope = this.indexedScopes[token.id];
 874
 875         }
 876         //if (this.mode == 'BUILDING_SYMBOL_TREE')
 877         //    print('FUNC-PARSE:' + JSON.stringify(token,null,4));
 878         // Parse function arguments.
 879         var args = token.items;
 880         for (var argpos =0; argpos < args.length; argpos++) {
 881
 882             token = args[argpos][0];
 883             //print ("FUNC ARGS: " + token.toString())
 884             //assert token.getType() == Token.NAME ||
 885             //        token.getType() == Token.COMMA;
 886             if (token.type == 'NAME' && this.mode == 'BUILDING_SYMBOL_TREE') {
 887                 symbol = token.data;
 888                 identifier = fnScope.declareIdentifier(symbol,token);
 889                 if (symbol == "$super" && argpos == 0) {
 890                     // Exception for Prototype 1.6...
 891                     identifier.preventMunging();
 892                 }
 893                 //argpos++;
 894             }
 895         }
 896
 897         token = this.ts.nextTok();
 898         //print('FUNC-BODY:' + JSON.stringify(token.items,null,4));
 899         //Seed.quit();
 900         //print(token.toString());
 901         // assert token.getType() == Token.LC;
 902         //this.braceNesting++;
 903
 904         //token = this.ts.nextTok();
 905         //print(token.toString());
 906         var outTS = this.ts;
 907         var _this = this;
 908         token.items.forEach(function(tar) {
 909             _this.ts = new TokenStream(tar);
 910             _this.parseScope(fnScope);
 911
 912
 913         });
 914
 915         //print(JSON.stringify(this.ts,null,4));
 916         //this.parseScope(fnScope);
 917         this.ts = outTS;
 918         // now pop it off the stack!!!
 919
 920         //this.braceNesting = b4braceNesting;
 921         //print("ENDFN -1: " + this.ts.lookTok(-1).toString());
 922         //print("ENDFN 0: " + this.ts.lookTok(0).toString());
 923         //print("ENDFN 1: " + this.ts.lookTok(1).toString());
 924     },
 925
 926     protectScopeFromObfuscation : function(scope) {
 927             //assert scope != null;
 928
 929         if (scope == this.globalScope) {
 930             // The global scope does not get obfuscated,
 931             // so we don't need to worry about it...
 932             return;
 933         }
 934
 935         // Find the highest local scope containing the specified scope.
 936         while (scope && scope.parent != this.globalScope) {
 937             scope = scope.parent;
 938         }
 939
 940         //assert scope.getParentScope() == globalScope;
 941         scope.preventMunging();
 942     },
 943
 944     getIdentifier: function(symbol, scope, token) {
 945         var identifier;
 946         while (scope != false) {
 947             identifier = scope.getIdentifier(symbol, token);
 948             //println("ScopeParser.getIdentgetUsedSymbols("+symbol+")=" + scope.getUsedSymbols().join(','));
 949             if (identifier) {
 950                 return identifier;
 951             }
 952             scope = scope.parent;
 953         }
 954         return false;
 955     }
 956 };