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

   1
   2
   3
   4 namespace JSDOC {
   5
   6         public class ScopeParser : Object {
   7
   8         TokenStream ts;
   9         Gee.ArrayList<string> warnings;
  10
  11         bool debug = false;
  12         string[] idents;
  13
  14
  15     Scope global ;
  16     //mode : "", //"BUILDING_SYMBOL_TREE",
  17     //braceNesting : 0,
  18     //indexedScopes : false,
  19     //munge: true,
  20
  21
  22
  23         public ScopeParser(TokenStream ts) {
  24                 this.ts = ts; // {TokenStream}
  25                 this.warnings = new Gee.ArrayList<string>();
  26                 this.globalScope = new  Scope(-1, false, -1, '');
  27
  28                 //this.indexedg = {};
  29                 //this.timer = new Date() * 1;
  30                 this.idents = {
  31
  32                         "break",
  33                     "case",
  34                     "continue",
  35                     "default",
  36                     "delete",
  37                     "do",
  38                         "else",
  39                         "export",
  40                         "false",
  41                         "for",
  42                         "function",
  43                         "if",
  44                         "import",
  45                         "in",
  46                         "new",
  47                         "null",
  48                         "return",
  49                         "switch",
  50                         "this",
  51                         "true",
  52                         "typeof",
  53                         "var",
  54                         "void",
  55                         "while",
  56                         "with",
  57
  58                         "catch",
  59                         "class",
  60                         "const",
  61                         "debugger",
  62                         "enum",
  63                         "extends",
  64                         "finally",
  65                         "super",
  66                     "throw",
  67                     "try",
  68
  69                     "abstract",
  70                     "boolean",
  71                     "byte",
  72                     "char",
  73                     "double",
  74                     "final",
  75                     "float",
  76                     "goto",
  77                     "implements",
  78                     "instanceof",
  79                     "int",
  80                     "interface",
  81                     "long",
  82                     "native",
  83                     "package",
  84                     "private",
  85                     "protected",
  86                     "public",
  87                     "short",
  88                     "static",
  89                     "synchronized",
  90                     "throws",
  91                     "transient",
  92                         "include",
  93                         "undefined"
  94                 };
  95         }
  96
  97
  98
  99
 100     void warn(string s)
 101     {
 102         //print('****************' + s);
 103         this.warnings.add(s);
 104         //println("WARNING:" + htmlescape(s) + "<BR>");
 105     }
 106
 107
 108     // defaults should not be initialized here =- otherwise they get duped on new, rather than initalized..
 109
 110
 111
 112
 113
 114
 115     void buildSymbolTree()
 116     {
 117         //println("<PRE>");
 118
 119         this.ts.rewind();
 120         this.braceNesting = 0;
 121
 122        // print(JSON.stringify(this.ts.tokens, null,4));
 123
 124
 125         this.globalScope = new  Scope(-1, false, -1, '');
 126         this.indexedScopes = { 0 : this.globalScope };
 127
 128         this.mode = 'BUILDING_SYMBOL_TREE';
 129         this.parseScope(this.globalScope);
 130
 131         //print("---------------END PASS 1 ---------------- ");
 132
 133     },
 134     mungeSymboltree : function()
 135     {
 136
 137         if (!this.munge) {
 138             return;
 139         }
 140
 141         // One problem with obfuscation resides in the use of undeclared
 142         // and un-namespaced global symbols that are 3 characters or less
 143         // in length. Here is an example:
 144         //
 145         //     var declaredGlobalVar;
 146         //
 147         //     function declaredGlobalFn() {
 148         //         var localvar;
 149         //         localvar = abc; // abc is an undeclared global symbol
 150         //     }
 151         //
 152         // In the example above, there is a slim chance that localvar may be
 153         // munged to 'abc', conflicting with the undeclared global symbol
 154         // abc, creating a potential bug. The following code detects such
 155         // global symbols. This must be done AFTER the entire file has been
 156         // parsed, and BEFORE munging the symbol tree. Note that declaring
 157         // extra symbols in the global scope won't hurt.
 158         //
 159         // Note: Since we go through all the tokens to do this, we also use
 160         // the opportunity to count how many times each identifier is used.
 161
 162         this.ts.rewind();
 163         this.braceNesting = 0;
 164         this.mode = 'PASS2_SYMBOL_TREE';
 165
 166         //println("MUNGING?");
 167
 168         this.parseScope(this.globalScope);
 169
 170         //this.globalScope.dump();
 171
 172
 173         this.globalScope.munge();
 174     },
 175
 176
 177     log : function(str)
 178     {
 179         print ("                    ".substring(0, this.braceNesting*2) + str);
 180
 181         //println("<B>LOG:</B>" + htmlescape(str) + "<BR/>\n");
 182     },
 183     logR : function(str)
 184     {
 185             //println("<B>LOG:</B>" + str + "<BR/>");
 186     },
 187
 188
 189
 190
 191
 192     parseScope : function(scope) // parse a token stream..
 193     {
 194         //this.timerPrint("parseScope EnterScope");
 195         //this.log(">>> ENTER SCOPE" + this.scopes.length);
 196         var symbol;
 197         var token;
 198
 199         var identifier;
 200
 201         var expressionBraceNesting = this.braceNesting + 0;
 202
 203         var parensNesting = 0;
 204
 205         var isObjectLitAr = [ false ];
 206         var isInObjectLitAr;
 207
 208
 209         //var scopeIndent = '';
 210         //this.scopes.forEach(function() {
 211         //    scopeIndent += '   ';
 212         //});
 213         //print(">> ENTER SCOPE");
 214
 215
 216
 217
 218         token = this.ts.lookTok(1);
 219         while (token) {
 220           //  this.timerPrint("parseScope AFTER lookT: " + token.toString());
 221             //this.dumpToken(token , this.scopes, this.braceNesting);
 222             //print('SCOPE:' + token.toString());
 223             //this.log(token.data);
 224             //if (token.type == 'NAME') {
 225             //    print('*' + token.data);
 226             //}
 227             switch(token.type + '.' + token.name) {
 228                 case "KEYW.VAR":
 229                 case "KEYW.CONST": // not really relivant as it's only mozzy that does this.
 230                     //print('SCOPE-VAR:' + token.toString());
 231                     var vstart = this.ts.cursor +1;
 232
 233                     //this.log("parseScope GOT VAR/CONST : " + token.toString());
 234                     while (true) {
 235                         token = this.ts.nextTok();
 236                         //!this.debug|| print( token.toString());
 237                        // print('SCOPE-VAR-VAL:' + JSON.stringify(token, null, 4));
 238                         if (!token) { // can return false at EOF!
 239                             break;
 240                         }
 241                         if (token.name == "VAR" || token.data == ',') { // kludge..
 242                             continue;
 243                         }
 244                         //this.logR("parseScope GOT VAR  : <B>" + token.toString() + "</B>");
 245                         if (token.type != "NAME") {
 246                             for(var i = Math.max(this.ts.cursor-10,0); i < this.ts.cursor+1; i++) {
 247                                 print(this.ts.tokens[i].toString());
 248                             }
 249
 250                             print( "var without ident");
 251                             Seed.quit()
 252                         }
 253
 254
 255                         if (this.mode == "BUILDING_SYMBOL_TREE") {
 256                             identifier = scope.getIdentifier(token.data,token) ;
 257
 258                             if (identifier == false) {
 259                                 scope.declareIdentifier(token.data, token);
 260                             } else {
 261                                 token.identifier = identifier;
 262                                 this.warn("(SCOPE) The variable " + token.data  + ' (line:' + token.line + ")  has already been declared in the same scope...");
 263                             }
 264                         }
 265
 266                         token = this.ts.nextTok();
 267                         !this.debug|| print(token.toString());
 268                         /*
 269                         assert token.getType() == Token.SEMI ||
 270                                 token.getType() == Token.ASSIGN ||
 271                                 token.getType() == Token.COMMA ||
 272                                 token.getType() == Token.IN;
 273                         */
 274                         if (token.name == "IN") {
 275                             break;
 276                         } else {
 277                             //var bn = this.braceNesting;
 278                             var bn = this.braceNesting;
 279                             var nts = [];
 280                             while (true) {
 281                                 if (!token || token.type == 'VOID' || token.data == ',') {
 282                                     break;
 283                                 }
 284                                 nts.push(token);
 285                                 token = this.ts.nextTok();
 286                             }
 287                             if (nts.length) {
 288                                 var TS = this.ts;
 289                                 this.ts = new TokenStream(nts);
 290                                 this.parseExpression(scope);
 291                                 this.ts = TS;
 292                             }
 293
 294                             this.braceNesting = bn;
 295                             //this.braceNesting = bn;
 296                             //this.logR("parseScope DONE  : <B>ParseExpression</B> - tok is:" + this.ts.lookT(0).toString());
 297
 298                             token = this.ts.lookTok(1);
 299                             //!this.debug||
 300                            // print("AFTER EXP: " + token.toString());
 301                             if (token.data == ';') {
 302                                 break;
 303                             }
 304                         }
 305                     }
 306
 307                     //print("VAR:")
 308                     //this.ts.dump(vstart , this.ts.cursor);
 309
 310                     break;
 311
 312
 313                 case "KEYW.FUNCTION":
 314                     //if (this.mode == 'BUILDING_SYMBOL_TREE')
 315                     //    print('SCOPE-FUNC:' + JSON.stringify(token,null,4));
 316                     //println("<i>"+token.data+"</i>");
 317                      var bn = this.braceNesting;
 318                     this.parseFunctionDeclaration(scope);
 319                      this.braceNesting = bn;
 320                     break;
 321
 322                 case "PUNC.LEFT_CURLY": // {
 323                 case "PUNC.LEFT_PAREN": // (
 324                 case "PUNC.LEFT_BRACE": // [
 325                     //print('SCOPE-CURLY/PAREN:' + token.toString());
 326                     //println("<i>"+token.data+"</i>");
 327                     var curTS = this.ts;
 328                     if (token.props) {
 329
 330                         // { a : ... , c : .... }
 331
 332                         for (var prop in token.props) {
 333
 334
 335                           //  print('SCOPE-PROPS:' + JSON.stringify(token.props[prop],null,4));
 336                             if (token.props[prop].val[0].data == 'function') {
 337                                 // parse a function..
 338                                 this.ts = new TokenStream(token.props[prop].val);
 339                                 this.ts.nextTok();
 340                                 this.parseFunctionDeclaration(scope);
 341
 342                                 continue;
 343                             }
 344                             // key value..
 345
 346                             this.ts = new TokenStream(token.props[prop].val);
 347                             this.parseExpression(scope);
 348
 349                         }
 350                         this.ts = curTS;
 351
 352                         // it's an object literal..
 353                         // the values could be replaced..
 354                         break;
 355                     }
 356
 357                     // ( ... ) or { .... } not object literals..
 358
 359                     var _this = this;
 360                     for (var xx =0; xx < token.items.length; xx++) {
 361                                 expr = token.items[xx];
 362                     //token.items.forEach(function(expr) {
 363                             //print(expr.toString());
 364                            _this.ts = new TokenStream(expr);
 365                             //if (curTS.data == '(') {
 366                                 _this.parseScope(scope)
 367                             //} else {
 368                               //  _this.parseExpression(scope)
 369                             //}
 370
 371                     }
 372                     this.ts = curTS;
 373                     //print("NOT PROPS"); Seed.quit();
 374
 375                     //isObjectLitAr.push(false);
 376                     //this.braceNesting++;
 377
 378                     //print(">>>>>> OBJLIT PUSH(false)" + this.braceNesting);
 379                     break;
 380
 381                 case "PUNC.RIGHT_CURLY": // }
 382                     //print("<< EXIT SCOPE");
 383                     return;
 384
 385                 case "KEYW.WITH":
 386                     //print('SCOPE-WITH:' + token.toString());
 387                     //println("<i>"+token.data+"</i>");
 388                     if (this.mode == "BUILDING_SYMBOL_TREE") {
 389                         // Inside a 'with' block, it is impossible to figure out
 390                         // statically whether a symbol is a local variable or an
 391                         // object member. As a consequence, the only thing we can
 392                         // do is turn the obfuscation off for the highest scope
 393                         // containing the 'with' block.
 394                         this.protectScopeFromObfuscation(scope);
 395                         this.warn("Using 'with' is not recommended." + (this.munge ? " Moreover, using 'with' reduces the level of compression!" : ""), true);
 396                     }
 397                     break;
 398
 399                 case "KEYW.CATCH":
 400                     //print('SCOPE-CATCH:' + token.toString());
 401                     //println("<i>"+token.data+"</i>");
 402                     this.parseCatch(scope);
 403                     break;
 404
 405                 case "STRN.DOUBLE_QUOTE": // used for object lit detection..
 406                 case "STRN.SINGLE_QUOTE":
 407                   //  print('SCOPE-STRING:' + token.toString());
 408                     //println("<i>"+token.data+"</i>");
 409
 410                     if (this.ts.lookTok(-1).data == '{' && this.ts.lookTok(1).data == ':') {
 411                         // then we are in an object lit.. -> we need to flag the brace as such...
 412                         isObjectLitAr.pop();
 413                         isObjectLitAr.push(true);
 414                         //print(">>>>>> OBJLIT REPUSH(true)");
 415                     }
 416                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 417
 418                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ':' &&
 419                         ( this.ts.lookTok(-1).data == '{'  ||  this.ts.lookTok(-1).data == ':' )) {
 420                         // see if we can replace..
 421                         // remove the quotes..
 422                         // should do a bit more checking!!!! (what about wierd char's in the string..
 423                         var str = token.data.substring(1,token.data.length-1);
 424                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 425                             token.outData = str;
 426                         }
 427
 428
 429
 430                     }
 431
 432                     break;
 433
 434                 case "NAME.NAME":
 435                     //print('SCOPE-NAME:' + token.toString());
 436                     //print("DEAL WITH NAME:");
 437                     // got identifier..
 438                     // look for  { ** : <- indicates obj literal.. ** this could occur with numbers ..
 439                     // skip anyting with "." before it..!!
 440
 441                     if (this.ts.lookTok(-1).data == ".") {
 442                         // skip, it's an object prop.
 443                         //println("<i>"+token.data+"</i>");
 444                         break;
 445                     }
 446                     //print("SYMBOL: " + token.toString());
 447
 448                     symbol = token.data;
 449                     if (symbol == 'this') {
 450                         break;
 451                     }
 452                     if (this.mode == 'PASS2_SYMBOL_TREE') {
 453
 454                         //println("GOT IDENT: -2 : " + this.ts.lookT(-2).toString() + " <BR> ..... -1 :  " +  this.ts.lookT(-1).toString() + " <BR> ");
 455
 456                         //print ("MUNGE?" + symbol);
 457
 458                         //println("GOT IDENT: <B>" + symbol + "</B><BR/>");
 459
 460                             //println("GOT IDENT (2): <B>" + symbol + "</B><BR/>");
 461                         identifier = this.getIdentifier(symbol, scope, token);
 462
 463                         if (identifier == false) {
 464 // BUG!find out where builtin is defined...
 465                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 466                                 // Here, we found an undeclared and un-namespaced symbol that is
 467                                 // 3 characters or less in length. Declare it in the global scope.
 468                                 // We don't need to declare longer symbols since they won't cause
 469                                 // any conflict with other munged symbols.
 470                                 this.globalScope.declareIdentifier(symbol, token);
 471                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 472                             }
 473
 474                             //println("GOT IDENT IGNORE(3): <B>" + symbol + "</B><BR/>");
 475                         } else {
 476                             token.identifier = identifier;
 477                             identifier.refcount++;
 478                         }
 479                     }
 480
 481                     break;
 482                     //println("<B>SID</B>");
 483                 default:
 484                     if (token.type != 'KEYW') {
 485                         break;
 486                     }
 487                     //print('SCOPE-KEYW:' + token.toString());
 488                    // print("Check eval:");
 489
 490                     symbol = token.data;
 491
 492                      if (this.mode == 'BUILDING_SYMBOL_TREE') {
 493
 494                         if (token.name == "EVAL") {
 495
 496                             //print(JSON.stringify(token, null,4));
 497                             // look back one and see if we can find a comment!!!
 498                             //if (this.ts.look(-1).type == "COMM") {
 499                             if (token.prefix && token.prefix.match(/eval/)) {
 500                                 // look for eval:var:noreplace\n
 501                                 //print("MATCH!?");
 502                                 var _t = this;
 503                                 token.prefix.replace(/eval:var:([a-z_]+)/ig, function(m, a) {
 504                                     //print("GOT: " + a);
 505                                     var hi = _t.getIdentifier(a, scope, token);
 506                                    // println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 507                                     if (hi) {
 508                                       //  print("PROTECT "+a+" from munge");
 509                                         //print(JSON.stringify(hi,null,4));
 510                                         hi.toMunge = false;
 511                                     }
 512
 513                                 });
 514
 515
 516                             } else {
 517
 518
 519                                 this.protectScopeFromObfuscation(scope);
 520                                 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);
 521                             }
 522
 523                         }
 524
 525                     }
 526                     break;
 527
 528
 529             } // end switch
 530
 531
 532             //print("parseScope TOK : " + token.toString());
 533             token = this.ts.nextTok();
 534             //if (this.ts.nextT()) break;
 535
 536         }
 537         //print("<<< EXIT SCOPE");
 538         //print("<<<<<<<EXIT SCOPE ERR?" +this.scopes.length);
 539     },
 540
 541     expN : 0,
 542     parseExpression : function(scope) {
 543
 544         // Parse the expression until we encounter a comma or a semi-colon
 545         // in the same brace nesting, bracket nesting and paren nesting.
 546         // Parse functions if any...
 547         //println("<i>EXP</i><BR/>");
 548         !this.debug || print("PARSE EXPR");
 549         this.expN++;
 550
 551         // for printing stuff..
 552
 553
 554
 555         var symbol;
 556         var token;
 557
 558         var identifier;
 559
 560         var expressionBraceNesting = this.braceNesting + 0;
 561         var bracketNesting = 0;
 562         var parensNesting = 0;
 563         var isInObjectLitAr;
 564         var isObjectLitAr = [ false ];
 565
 566
 567
 568
 569         //print(scopeIndent + ">> ENTER EXPRESSION" + this.expN);
 570         while ((token = this.ts.nextTok())) {
 571
 572
 573
 574            /*
 575             // moved out of loop?
 576            currentScope = this.scopes[this.scopes.length-1];
 577
 578             var scopeIndent = '';
 579             this.scopes.forEach(function() {
 580                 scopeIndent += '   ';
 581             });
 582            */
 583
 584            //this.dumpToken(token,  this.scopes, this.braceNesting );
 585             //print('EXPR' +  token.toString());
 586
 587
 588             //println("<i>"+token.data+"</i>");
 589             //this.log("EXP:" + token.data);
 590             switch (token.type) {
 591                 case 'PUNC':
 592                     //print("EXPR-PUNC:" + token.toString());
 593
 594                     switch(token.data) {
 595
 596                         case ';':
 597                             //print("<< EXIT EXPRESSION");
 598                             break;
 599
 600                         case ',':
 601
 602                             break;
 603
 604
 605                         case '(': //Token.LP:
 606                         case '{': //Token.LC:
 607                         case '[': //Token.LB:
 608                             //print('SCOPE-CURLY/PAREN/BRACE:' + token.toString());
 609                            // print('SCOPE-CURLY/PAREN/BRACE:' + JSON.stringify(token, null,4));
 610                             //println("<i>"+token.data+"</i>");
 611                             var curTS = this.ts;
 612                             if (token.props) {
 613
 614                                 for (var prop in token.props) {
 615                                     if (!token.props[prop].val.length) {
 616                                         print(JSON.stringify(token.props, null,4));
 617                                     }
 618
 619                                     if (token.props[prop].val[0].data == 'function') {
 620                                         // parse a function..
 621                                         this.ts = new TokenStream(token.props[prop].val);
 622                                         this.ts.nextTok();
 623                                         this.parseFunctionDeclaration(scope);
 624                                         continue;
 625                                     }
 626                                     // key value..
 627
 628                                     this.ts = new TokenStream(token.props[prop].val);
 629                                     this.parseExpression(scope);
 630
 631                                 }
 632                                 this.ts = curTS;
 633
 634                                 // it's an object literal..
 635                                 // the values could be replaced..
 636                                 break;
 637                             }
 638
 639
 640                             var _this = this;
 641                             token.items.forEach(function(expr) {
 642                                   _this.ts = new TokenStream(expr);
 643                                   _this.parseExpression(scope)
 644                             });
 645                             this.ts = curTS;
 646
 647
 648
 649                             ///print(">>>>> EXP PUSH(false)"+this.braceNesting);
 650                             break;
 651
 652
 653
 654
 655
 656                         case ')': //Token.RP:
 657                         case ']': //Token.RB:
 658                         case '}': //Token.RB:
 659                             //print("<< EXIT EXPRESSION");
 660                             return;
 661
 662
 663
 664                             parensNesting++;
 665                             break;
 666
 667
 668
 669                     }
 670                     break;
 671
 672                 case 'STRN': // used for object lit detection..
 673                     //if (this.mode == 'BUILDING_SYMBOL_TREE')
 674                         //print("EXPR-STR:" + JSON.stringify(token, null, 4));
 675
 676
 677                     break;
 678
 679
 680
 681                 case 'NAME':
 682                     if (this.mode == 'BUILDING_SYMBOL_TREE') {
 683
 684                         //print("EXPR-NAME:" + JSON.stringify(token, null, 4));
 685                     } else {
 686                         //print("EXPR-NAME:" + token.toString());
 687                     }
 688                     symbol = token.data;
 689                     //print("in NAME = " + token.toString());
 690                     //print("in NAME 0: " + this.ts.look(0).toString());
 691                     //print("in NAME 2: " + this.ts.lookTok(2).toString());
 692
 693                     //print(this.ts.lookTok(-1).data);
 694                     // prefixed with '.'
 695                     if (this.ts.lookTok(-1).data == ".") {
 696                         //skip '.'
 697                         break;
 698                     }
 699                     if (symbol == 'this') {
 700                         break;
 701                        }
 702
 703                     if (this.mode == 'PASS2_SYMBOL_TREE') {
 704
 705                         identifier = this.getIdentifier(symbol, scope, token);
 706                         //println("<B>??</B>");
 707                         if (identifier == false) {
 708
 709                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 710                                 // Here, we found an undeclared and un-namespaced symbol that is
 711                                 // 3 characters or less in length. Declare it in the global scope.
 712                                 // We don't need to declare longer symbols since they won't cause
 713                                 // any conflict with other munged symbols.
 714                                 this.globalScope.declareIdentifier(symbol, token);
 715                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 716                                 //print("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')');
 717                                 //throw "OOPS";
 718                             } else {
 719                                 //print("undeclared:" + token.toString())
 720                             }
 721
 722
 723                         } else {
 724                             //println("<B>++</B>");
 725                             token.identifier = identifier;
 726                             identifier.refcount++;
 727                         }
 728
 729                     }
 730                     break;
 731
 732
 733
 734
 735                     //println("<B>EID</B>");
 736                 case 'KEYW':
 737                     //if (this.mode == 'BUILDING_SYMBOL_TREE')
 738                     //    print("EXPR-KEYW:" + JSON.stringify(token, null, 4));
 739
 740                     //print('EXPR-KEYW:' + token.toString());
 741                     if (token.name == "FUNCTION") {
 742
 743                         this.parseFunctionDeclaration(scope);
 744                         break;
 745                     }
 746
 747
 748                     symbol = token.data;
 749                     if (this.mode == 'BUILDING_SYMBOL_TREE') {
 750
 751                         if (token.name == "EVAL") {
 752                             //print(JSON.stringify(token,null,4));
 753                             if (token.prefix && token.prefix.match(/eval:var:/g)) {
 754                                 // look for eval:var:noreplace\n
 755                                // print("GOT MATCH?");
 756                                 var _t = this;
 757                                 token.prefix.replace(/eval:var:([a-z]+)/ig, function(m, a) {
 758
 759                                     //print("PROTECT: " + a);
 760
 761
 762                                     var hi = _t.getIdentifier(a, scope, token);
 763                                    //println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 764                                     if (hi) {
 765                                       //  println("PROTECT "+a+" from munge");
 766                                         hi.toMunge = false;
 767                                     }
 768
 769
 770                                 });
 771
 772                             } else {
 773                                 this.protectScopeFromObfuscation(scope);
 774                                 this.warn("Using 'eval' is not recommended." + (this.munge ? " Moreover, using 'eval' reduces the level of compression!" : ""), true);
 775                             }
 776
 777
 778                         }
 779                         break;
 780                     }
 781                 default:
 782                     //if (this.mode == 'BUILDING_SYMBOL_TREE')
 783                     //    print("EXPR-SKIP:" + JSON.stringify(token, null, 4));
 784                     break;
 785             }
 786
 787         }
 788         //print("<< EXIT EXPRESSION");
 789         this.expN--;
 790     },
 791
 792
 793     parseCatch : function(scope) {
 794
 795         var symbol;
 796         var token;
 797
 798         var identifier;
 799
 800         //token = getToken(-1);
 801         //assert token.getType() == Token.CATCH;
 802         token = this.ts.nextTok(1);
 803         token = this.ts.nextTok(1);
 804
 805
 806         //print(JSON.stringify(this.ts,null,4));
 807         //assert token.getType() == Token.LP; (
 808         //token = this.ts.nextTok();
 809         //assert token.getType() == Token.NAME;
 810
 811         symbol = token.items[0][0].data;
 812
 813
 814         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 815             // We must declare the exception identifier in the containing function
 816             // scope to avoid errors related to the obfuscation process. No need to
 817             // display a warning if the symbol was already declared here...
 818             scope.declareIdentifier(symbol, token.items[0][0]);
 819         } else {
 820             //?? why inc the refcount?? - that should be set when building the tree???
 821             identifier = this.getIdentifier(symbol, scope, token.items[0][0]);
 822             identifier.refcount++;
 823         }
 824
 825         //token = this.ts.nextTok();
 826         //assert token.getType() == Token.RP; // )
 827     },
 828
 829     parseFunctionDeclaration : function(scope)
 830     {
 831         //print("PARSE FUNCTION");
 832         var symbol;
 833         var token;
 834
 835         var fnScope = false;
 836         var identifier;
 837         var b4braceNesting = this.braceNesting + 0;
 838
 839         //this.logR("<B>PARSING FUNCTION</B>");
 840
 841
 842         token = this.ts.nextTok();
 843         if (token.type == "NAME") {
 844             if (this.mode == 'BUILDING_SYMBOL_TREE') {
 845                 // Get the name of the function and declare it in the current scope.
 846                 symbol = token.data;
 847                 if (scope.getIdentifier(symbol,token) != false) {
 848                     this.warn("The function " + symbol + " has already been declared in the same scope...", true);
 849                 }
 850                 scope.declareIdentifier(symbol,token);
 851             }
 852             token =  this.ts.nextTok();
 853         }
 854
 855
 856         // return function() {....
 857         while (token.data != "(") {
 858             //print(token.toString());
 859             token =  this.ts.nextTok();
 860
 861         }
 862
 863
 864         //assert token.getType() == Token.LP;
 865         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 866             fnScope = new Scope(1, scope, token.n, '', token);
 867
 868             //println("STORING SCOPE" + this.ts.cursor);
 869
 870             this.indexedScopes[token.id] = fnScope;
 871
 872         } else {
 873             //qln("FETCHING SCOPE" + this.ts.cursor);
 874             fnScope = this.indexedScopes[token.id];
 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 };