git.roojs.org Git - app.jsdoc/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 * This code now uses the collapsed tree
   9 * @class ScopeParser
  10 * @namespace JSDOC
  11 *
  12 *
  13 */
  14
  15 ScopeParser = function(ts) {
  16     this.ts = ts; // {TokenStream}
  17     this.warnings = [];
  18     this.indexedg = {};
  19     this.timer = new Date() * 1;
  20     this.debug = false;
  21 }
  22
  23 // list of keywords that should not be used in object literals.
  24 ScopeParser.idents = [
  25         "break",
  26         "case",
  27         "continue",
  28         "default",
  29         "delete",
  30         "do",
  31         "else",
  32         "export",
  33         "false",
  34         "for",
  35         "function",
  36         "if",
  37         "import",
  38         "in",
  39         "new",
  40         "null",
  41         "return",
  42         "switch",
  43         "this",
  44         "true",
  45         "typeof",
  46         "var",
  47         "void",
  48         "while",
  49         "with",
  50
  51         "catch",
  52         "class",
  53         "const",
  54         "debugger",
  55         "enum",
  56         "extends",
  57         "finally",
  58         "super",
  59         "throw",
  60         "try",
  61
  62         "abstract",
  63         "boolean",
  64         "byte",
  65         "char",
  66         "double",
  67         "final",
  68         "float",
  69         "goto",
  70         "implements",
  71         "instanceof",
  72         "int",
  73         "interface",
  74         "long",
  75         "native",
  76         "package",
  77         "private",
  78         "protected",
  79         "public",
  80         "short",
  81         "static",
  82         "synchronized",
  83         "throws",
  84         "transient",
  85                 "include",
  86                 "undefined"
  87 ];
  88
  89
  90 ScopeParser.prototype = {
  91     timer: 0,
  92     timerPrint: function (str) {
  93         var ntime = new Date() * 1;
  94         var tdif =  ntime -this.timer;
  95         this.timer = ntime;
  96         var pref = '';
  97         if (tdif > 100) { //slower ones..
  98             pref = '***';
  99         }
 100         println(pref+'['+tdif+']'+str);
 101
 102     },
 103     warn: function(s) {
 104         //print('****************' + s);
 105         this.warnings.push(s);
 106         //println("WARNING:" + htmlescape(s) + "<BR>");
 107     },
 108     // defaults should not be initialized here =- otherwise they get duped on new, rather than initalized..
 109     warnings : false,
 110     ts : false,
 111     global : false,
 112     mode : "", //"BUILDING_SYMBOL_TREE",
 113     braceNesting : 0,
 114     indexedScopes : false,
 115     munge: true,
 116
 117
 118
 119
 120
 121     buildSymbolTree : function()
 122     {
 123         //println("<PRE>");
 124
 125         this.ts.rewind();
 126         this.braceNesting = 0;
 127
 128        // print(JSON.stringify(this.ts.tokens, null,4));
 129
 130
 131         this.globalScope = new  Scope(-1, false, -1, '');
 132         this.indexedScopes = { 0 : this.globalScope };
 133
 134         this.mode = 'BUILDING_SYMBOL_TREE';
 135         this.parseScope(this.globalScope);
 136
 137         //print("---------------END PASS 1 ---------------- ");
 138
 139     },
 140     mungeSymboltree : function()
 141     {
 142
 143         if (!this.munge) {
 144             return;
 145         }
 146
 147         // One problem with obfuscation resides in the use of undeclared
 148         // and un-namespaced global symbols that are 3 characters or less
 149         // in length. Here is an example:
 150         //
 151         //     var declaredGlobalVar;
 152         //
 153         //     function declaredGlobalFn() {
 154         //         var localvar;
 155         //         localvar = abc; // abc is an undeclared global symbol
 156         //     }
 157         //
 158         // In the example above, there is a slim chance that localvar may be
 159         // munged to 'abc', conflicting with the undeclared global symbol
 160         // abc, creating a potential bug. The following code detects such
 161         // global symbols. This must be done AFTER the entire file has been
 162         // parsed, and BEFORE munging the symbol tree. Note that declaring
 163         // extra symbols in the global scope won't hurt.
 164         //
 165         // Note: Since we go through all the tokens to do this, we also use
 166         // the opportunity to count how many times each identifier is used.
 167
 168         this.ts.rewind();
 169         this.braceNesting = 0;
 170         this.mode = 'PASS2_SYMBOL_TREE';
 171
 172         //println("MUNGING?");
 173
 174         this.parseScope(this.globalScope);
 175
 176         //this.globalScope.dump();
 177
 178
 179         this.globalScope.munge();
 180     },
 181
 182
 183     log : function(str)
 184     {
 185         print ("                    ".substring(0, this.braceNesting*2) + str);
 186
 187         //println("<B>LOG:</B>" + htmlescape(str) + "<BR/>\n");
 188     },
 189     logR : function(str)
 190     {
 191             //println("<B>LOG:</B>" + str + "<BR/>");
 192     },
 193
 194
 195
 196
 197
 198     parseScope : function(scope) // parse a token stream..
 199     {
 200         //this.timerPrint("parseScope EnterScope");
 201         //this.log(">>> ENTER SCOPE" + this.scopes.length);
 202         var symbol;
 203         var token;
 204
 205         var identifier;
 206
 207         var expressionBraceNesting = this.braceNesting + 0;
 208
 209         var parensNesting = 0;
 210
 211         var isObjectLitAr = [ false ];
 212         var isInObjectLitAr;
 213
 214
 215         //var scopeIndent = '';
 216         //this.scopes.forEach(function() {
 217         //    scopeIndent += '   ';
 218         //});
 219         //print(">> ENTER SCOPE");
 220
 221
 222
 223
 224         token = this.ts.lookTok(1);
 225         while (token) {
 226           //  this.timerPrint("parseScope AFTER lookT: " + token.toString());
 227             //this.dumpToken(token , this.scopes, this.braceNesting);
 228             //print('SCOPE:' + token.toString());
 229             //this.log(token.data);
 230             if (token.type == 'NAME') {
 231             //    print('*' + token.data);
 232             }
 233             switch(token.type + '.' + token.name) {
 234                 case "KEYW.VAR":
 235                 case "KEYW.CONST": // not really relivant as it's only mozzy that does this.
 236                     //print('SCOPE-VAR:' + token.toString());
 237                     var vstart = this.ts.cursor +1;
 238
 239                     //this.log("parseScope GOT VAR/CONST : " + token.toString());
 240                     while (true) {
 241                         token = this.ts.nextTok();
 242                         //!this.debug|| print( token.toString());
 243                        // print('SCOPE-VAR-VAL:' + JSON.stringify(token, null, 4));
 244                         if (!token) { // can return false at EOF!
 245                             break;
 246                         }
 247                         if (token.name == "VAR" || token.data == ',') { // kludge..
 248                             continue;
 249                         }
 250                         //this.logR("parseScope GOT VAR  : <B>" + token.toString() + "</B>");
 251                         if (token.type != "NAME") {
 252                             for(var i = Math.max(this.ts.cursor-10,0); i < this.ts.cursor+1; i++) {
 253                                 print(this.ts.tokens[i].toString());
 254                             }
 255
 256                             print( "var without ident");
 257                             Seed.quit()
 258                         }
 259
 260
 261                         if (this.mode == "BUILDING_SYMBOL_TREE") {
 262                             identifier = scope.getIdentifier(token.data,token) ;
 263
 264                             if (identifier == false) {
 265                                 scope.declareIdentifier(token.data, token);
 266                             } else {
 267                                 token.identifier = identifier;
 268                                 this.warn("(SCOPE) The variable " + token.data  + ' (line:' + token.line + ")  has already been declared in the same scope...");
 269                             }
 270                         }
 271
 272                         token = this.ts.nextTok();
 273                         !this.debug|| print(token.toString());
 274                         /*
 275                         assert token.getType() == Token.SEMI ||
 276                                 token.getType() == Token.ASSIGN ||
 277                                 token.getType() == Token.COMMA ||
 278                                 token.getType() == Token.IN;
 279                         */
 280                         if (token.name == "IN") {
 281                             break;
 282                         } else {
 283                             //var bn = this.braceNesting;
 284                             var bn = this.braceNesting;
 285                             var nts = [];
 286                             while (true) {
 287                                 if (!token || token.type == 'VOID' || token.data == ',') {
 288                                     break;
 289                                 }
 290                                 nts.push(token);
 291                                 token = this.ts.nextTok();
 292                             }
 293                             if (nts.length) {
 294                                 var TS = this.ts;
 295                                 this.ts = new TokenStream(nts);
 296                                 this.parseExpression(scope);
 297                                 this.ts = TS;
 298                             }
 299
 300                             this.braceNesting = bn;
 301                             //this.braceNesting = bn;
 302                             //this.logR("parseScope DONE  : <B>ParseExpression</B> - tok is:" + this.ts.lookT(0).toString());
 303
 304                             token = this.ts.lookTok(1);
 305                             //!this.debug||
 306                            // print("AFTER EXP: " + token.toString());
 307                             if (token.data == ';') {
 308                                 break;
 309                             }
 310                         }
 311                     }
 312
 313                     //print("VAR:")
 314                     //this.ts.dump(vstart , this.ts.cursor);
 315
 316                     break;
 317
 318
 319                 case "KEYW.FUNCTION":
 320                     //if (this.mode == 'BUILDING_SYMBOL_TREE')
 321                     //    print('SCOPE-FUNC:' + JSON.stringify(token,null,4));
 322                     //println("<i>"+token.data+"</i>");
 323                      var bn = this.braceNesting;
 324                     this.parseFunctionDeclaration(scope);
 325                      this.braceNesting = bn;
 326                     break;
 327
 328                 case "PUNC.LEFT_CURLY": // {
 329                 case "PUNC.LEFT_PAREN": // (
 330                 case "PUNC.LEFT_BRACE": // [
 331                     //print('SCOPE-CURLY/PAREN:' + token.toString());
 332                     //println("<i>"+token.data+"</i>");
 333                     var curTS = this.ts;
 334                     if (token.props) {
 335
 336                         for (var prop in token.props) {
 337
 338
 339                           //  print('SCOPE-PROPS:' + JSON.stringify(token.props[prop],null,4));
 340                             if (token.props[prop].val[0].data == 'function') {
 341                                 // parse a function..
 342                                 this.ts = new TokenStream(token.props[prop].val);
 343                                 this.ts.nextTok();
 344                                 this.parseFunctionDeclaration(scope);
 345
 346                                 continue;
 347                             }
 348                             // key value..
 349
 350                             this.ts = new TokenStream(token.props[prop].val);
 351                             this.parseExpression(scope);
 352
 353                         }
 354                         this.ts = curTS;
 355
 356                         // it's an object literal..
 357                         // the values could be replaced..
 358                         break;
 359                     }
 360
 361
 362                     var _this = this;
 363                     token.items.forEach(function(expr) {
 364                            //print(JSON.stringify(expr, null,4));
 365                            _this.ts = new TokenStream(expr);
 366                             //if (curTS.data == '(') {
 367                                 _this.parseScope(scope)
 368                             //} else {
 369                               //  _this.parseExpression(scope)
 370                             //}
 371
 372                     });
 373                     this.ts = curTS;
 374                     //print("NOT PROPS"); Seed.quit();
 375
 376                     //isObjectLitAr.push(false);
 377                     //this.braceNesting++;
 378
 379                     //print(">>>>>> OBJLIT PUSH(false)" + this.braceNesting);
 380                     break;
 381
 382                 case "PUNC.RIGHT_CURLY": // }
 383                     //print("<< EXIT SCOPE");
 384                     return;
 385
 386                 case "KEYW.WITH":
 387                     //print('SCOPE-WITH:' + token.toString());
 388                     //println("<i>"+token.data+"</i>");
 389                     if (this.mode == "BUILDING_SYMBOL_TREE") {
 390                         // Inside a 'with' block, it is impossible to figure out
 391                         // statically whether a symbol is a local variable or an
 392                         // object member. As a consequence, the only thing we can
 393                         // do is turn the obfuscation off for the highest scope
 394                         // containing the 'with' block.
 395                         this.protectScopeFromObfuscation(scope);
 396                         this.warn("Using 'with' is not recommended." + (this.munge ? " Moreover, using 'with' reduces the level of compression!" : ""), true);
 397                     }
 398                     break;
 399
 400                 case "KEYW.CATCH":
 401                     //print('SCOPE-CATCH:' + token.toString());
 402                     //println("<i>"+token.data+"</i>");
 403                     this.parseCatch(scope);
 404                     break;
 405
 406                 case "STRN.DOUBLE_QUOTE": // used for object lit detection..
 407                 case "STRN.SINGLE_QUOTE":
 408                   //  print('SCOPE-STRING:' + token.toString());
 409                     //println("<i>"+token.data+"</i>");
 410
 411                     if (this.ts.lookTok(-1).data == '{' && this.ts.lookTok(1).data == ':') {
 412                         // then we are in an object lit.. -> we need to flag the brace as such...
 413                         isObjectLitAr.pop();
 414                         isObjectLitAr.push(true);
 415                         //print(">>>>>> OBJLIT REPUSH(true)");
 416                     }
 417                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 418
 419                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ':' &&
 420                         ( this.ts.lookTok(-1).data == '{'  ||  this.ts.lookTok(-1).data == ':' )) {
 421                         // see if we can replace..
 422                         // remove the quotes..
 423                         // should do a bit more checking!!!! (what about wierd char's in the string..
 424                         var str = token.data.substring(1,token.data.length-1);
 425                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 426                             token.outData = str;
 427                         }
 428
 429
 430
 431                     }
 432
 433                     break;
 434
 435                 case "NAME.NAME":
 436                     //print('SCOPE-NAME:' + token.toString());
 437                     //print("DEAL WITH NAME:");
 438                     // got identifier..
 439                     // look for  { ** : <- indicates obj literal.. ** this could occur with numbers ..
 440                     // skip anyting with "." before it..!!
 441
 442                     if (this.ts.lookTok(-1).data == ".") {
 443                         // skip, it's an object prop.
 444                         //println("<i>"+token.data+"</i>");
 445                         break;
 446                     }
 447                     //print("SYMBOL: " + token.toString());
 448
 449                     symbol = token.data;
 450                     if (symbol == 'this') {
 451                         break;
 452                     }
 453                     if (this.mode == 'PASS2_SYMBOL_TREE') {
 454
 455                         //println("GOT IDENT: -2 : " + this.ts.lookT(-2).toString() + " <BR> ..... -1 :  " +  this.ts.lookT(-1).toString() + " <BR> ");
 456
 457                         //print ("MUNGE?" + symbol);
 458
 459                         //println("GOT IDENT: <B>" + symbol + "</B><BR/>");
 460
 461                             //println("GOT IDENT (2): <B>" + symbol + "</B><BR/>");
 462                         identifier = this.getIdentifier(symbol, scope, token);
 463
 464                         if (identifier == false) {
 465 // BUG!find out where builtin is defined...
 466                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 467                                 // Here, we found an undeclared and un-namespaced symbol that is
 468                                 // 3 characters or less in length. Declare it in the global scope.
 469                                 // We don't need to declare longer symbols since they won't cause
 470                                 // any conflict with other munged symbols.
 471                                 this.globalScope.declareIdentifier(symbol, token);
 472                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 473                             }
 474
 475                             //println("GOT IDENT IGNORE(3): <B>" + symbol + "</B><BR/>");
 476                         } else {
 477                             token.identifier = identifier;
 478                             identifier.refcount++;
 479                         }
 480                     }
 481
 482                     break;
 483                     //println("<B>SID</B>");
 484                 default:
 485                     if (token.type != 'KEYW') {
 486                         break;
 487                     }
 488                     //print('SCOPE-KEYW:' + token.toString());
 489                    // print("Check eval:");
 490
 491                     symbol = token.data;
 492
 493                      if (this.mode == 'BUILDING_SYMBOL_TREE') {
 494
 495                         if (token.name == "EVAL") {
 496
 497                             //print(JSON.stringify(token, null,4));
 498                             // look back one and see if we can find a comment!!!
 499                             //if (this.ts.look(-1).type == "COMM") {
 500                             if (token.prefix && token.prefix.match(/eval/)) {
 501                                 // look for eval:var:noreplace\n
 502                                 //print("MATCH!?");
 503                                 var _t = this;
 504                                 token.prefix.replace(/eval:var:([a-z_]+)/ig, function(m, a) {
 505                                     //print("GOT: " + a);
 506                                     var hi = _t.getIdentifier(a, scope, token);
 507                                    // println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 508                                     if (hi) {
 509                                       //  print("PROTECT "+a+" from munge");
 510                                         //print(JSON.stringify(hi,null,4));
 511                                         hi.toMunge = false;
 512                                     }
 513
 514                                 });
 515
 516
 517                             } else {
 518
 519
 520                                 this.protectScopeFromObfuscation(scope);
 521                                 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);
 522                             }
 523
 524                         }
 525
 526                     }
 527                     break;
 528
 529
 530             } // end switch
 531
 532
 533             //print("parseScope TOK : " + token.toString());
 534             token = this.ts.nextTok();
 535             //if (this.ts.nextT()) break;
 536
 537         }
 538         //print("<<< EXIT SCOPE");
 539         //print("<<<<<<<EXIT SCOPE ERR?" +this.scopes.length);
 540     },
 541
 542     expN : 0,
 543     parseExpression : function(scope) {
 544
 545         // Parse the expression until we encounter a comma or a semi-colon
 546         // in the same brace nesting, bracket nesting and paren nesting.
 547         // Parse functions if any...
 548         //println("<i>EXP</i><BR/>");
 549         !this.debug || print("PARSE EXPR");
 550         this.expN++;
 551
 552         // for printing stuff..
 553
 554
 555
 556         var symbol;
 557         var token;
 558
 559         var identifier;
 560
 561         var expressionBraceNesting = this.braceNesting + 0;
 562         var bracketNesting = 0;
 563         var parensNesting = 0;
 564         var isInObjectLitAr;
 565         var isObjectLitAr = [ false ];
 566
 567
 568
 569
 570         //print(scopeIndent + ">> ENTER EXPRESSION" + this.expN);
 571         while (token = this.ts.nextTok()) {
 572
 573
 574
 575            /*
 576             // moved out of loop?
 577            currentScope = this.scopes[this.scopes.length-1];
 578
 579             var scopeIndent = '';
 580             this.scopes.forEach(function() {
 581                 scopeIndent += '   ';
 582             });
 583            */
 584
 585            //this.dumpToken(token,  this.scopes, this.braceNesting );
 586             //print('EXPR' +  token.toString());
 587
 588
 589             //println("<i>"+token.data+"</i>");
 590             //this.log("EXP:" + token.data);
 591             switch (token.type) {
 592                 case 'PUNC':
 593                     //print("EXPR-PUNC:" + token.toString());
 594
 595                     switch(token.data) {
 596
 597                         case ';':
 598                             //print("<< EXIT EXPRESSION");
 599                             break;
 600
 601                         case ',':
 602
 603                             break;
 604
 605
 606                         case '(': //Token.LP:
 607                         case '{': //Token.LC:
 608                         case '[': //Token.LB:
 609                             //print('SCOPE-CURLY/PAREN/BRACE:' + token.toString());
 610                            // print('SCOPE-CURLY/PAREN/BRACE:' + JSON.stringify(token, null,4));
 611                             //println("<i>"+token.data+"</i>");
 612                             var curTS = this.ts;
 613                             if (token.props) {
 614
 615                                 for (var prop in token.props) {
 616                                     if (!token.props[prop].val.length) {
 617                                         print(JSON.stringify(token.props, null,4));
 618                                     }
 619
 620                                     if (token.props[prop].val[0].data == 'function') {
 621                                         // parse a function..
 622                                         this.ts = new TokenStream(token.props[prop].val);
 623                                         this.ts.nextTok();
 624                                         this.parseFunctionDeclaration(scope);
 625                                         continue;
 626                                     }
 627                                     // key value..
 628
 629                                     this.ts = new TokenStream(token.props[prop].val);
 630                                     this.parseExpression(scope);
 631
 632                                 }
 633                                 this.ts = curTS;
 634
 635                                 // it's an object literal..
 636                                 // the values could be replaced..
 637                                 break;
 638                             }
 639
 640
 641                             var _this = this;
 642                             token.items.forEach(function(expr) {
 643                                   _this.ts = new TokenStream(expr);
 644                                   _this.parseExpression(scope)
 645                             });
 646                             this.ts = curTS;
 647
 648
 649
 650                             ///print(">>>>> EXP PUSH(false)"+this.braceNesting);
 651                             break;
 652
 653
 654
 655
 656
 657                         case ')': //Token.RP:
 658                         case ']': //Token.RB:
 659                         case '}': //Token.RB:
 660                             //print("<< EXIT EXPRESSION");
 661                             return;
 662
 663
 664
 665                             parensNesting++;
 666                             break;
 667
 668
 669
 670                     }
 671                     break;
 672
 673                 case 'STRN': // used for object lit detection..
 674                     //if (this.mode == 'BUILDING_SYMBOL_TREE')
 675                         //print("EXPR-STR:" + JSON.stringify(token, null, 4));
 676
 677
 678                     break;
 679
 680
 681
 682                 case 'NAME':
 683                     if (this.mode == 'BUILDING_SYMBOL_TREE') {
 684
 685                         //print("EXPR-NAME:" + JSON.stringify(token, null, 4));
 686                     } else {
 687                         //print("EXPR-NAME:" + token.toString());
 688                     }
 689                     symbol = token.data;
 690                     //print("in NAME = " + token.toString());
 691                     //print("in NAME 0: " + this.ts.look(0).toString());
 692                     //print("in NAME 2: " + this.ts.lookTok(2).toString());
 693
 694                     //print(this.ts.lookTok(-1).data);
 695                     // prefixed with '.'
 696                     if (this.ts.lookTok(-1).data == ".") {
 697                         //skip '.'
 698                         break;
 699                     }
 700                     if (symbol == 'this') {
 701                         break;
 702                        }
 703
 704                     if (this.mode == 'PASS2_SYMBOL_TREE') {
 705
 706                         identifier = this.getIdentifier(symbol, scope, token);
 707                         //println("<B>??</B>");
 708                         if (identifier == false) {
 709
 710                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 711                                 // Here, we found an undeclared and un-namespaced symbol that is
 712                                 // 3 characters or less in length. Declare it in the global scope.
 713                                 // We don't need to declare longer symbols since they won't cause
 714                                 // any conflict with other munged symbols.
 715                                 this.globalScope.declareIdentifier(symbol, token);
 716                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 717                                 //print("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')');
 718                                 //throw "OOPS";
 719                             } else {
 720                                 //print("undeclared:" + token.toString())
 721                             }
 722
 723
 724                         } else {
 725                             //println("<B>++</B>");
 726                             token.identifier = identifier;
 727                             identifier.refcount++;
 728                         }
 729
 730                     }
 731                     break;
 732
 733
 734
 735
 736                     //println("<B>EID</B>");
 737                 case 'KEYW':
 738                     //if (this.mode == 'BUILDING_SYMBOL_TREE')
 739                     //    print("EXPR-KEYW:" + JSON.stringify(token, null, 4));
 740
 741                     //print('EXPR-KEYW:' + token.toString());
 742                     if (token.name == "FUNCTION") {
 743
 744                         this.parseFunctionDeclaration(scope);
 745                         break;
 746                     }
 747
 748
 749                     symbol = token.data;
 750                     if (this.mode == 'BUILDING_SYMBOL_TREE') {
 751
 752                         if (token.name == "EVAL") {
 753                             //print(JSON.stringify(token,null,4));
 754                             if (token.prefix && token.prefix.match(/eval:var:/g)) {
 755                                 // look for eval:var:noreplace\n
 756                                // print("GOT MATCH?");
 757                                 var _t = this;
 758                                 token.prefix.replace(/eval:var:([a-z]+)/ig, function(m, a) {
 759
 760                                     //print("PROTECT: " + a);
 761
 762
 763                                     var hi = _t.getIdentifier(a, scope, token);
 764                                    //println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 765                                     if (hi) {
 766                                       //  println("PROTECT "+a+" from munge");
 767                                         hi.toMunge = false;
 768                                     }
 769
 770
 771                                 });
 772
 773                             } else {
 774                                 this.protectScopeFromObfuscation(scope);
 775                                 this.warn("Using 'eval' is not recommended." + (this.munge ? " Moreover, using 'eval' reduces the level of compression!" : ""), true);
 776                             }
 777
 778
 779                         }
 780                         break;
 781                     }
 782                 default:
 783                     //if (this.mode == 'BUILDING_SYMBOL_TREE')
 784                     //    print("EXPR-SKIP:" + JSON.stringify(token, null, 4));
 785                     break;
 786             }
 787
 788         }
 789         //print("<< EXIT EXPRESSION");
 790         this.expN--;
 791     },
 792
 793
 794     parseCatch : function(scope) {
 795
 796         var symbol;
 797         var token;
 798         var scope;
 799         var identifier;
 800
 801         //token = getToken(-1);
 802         //assert token.getType() == Token.CATCH;
 803         token = this.ts.nextTok(1);
 804         token = this.ts.nextTok(1);
 805
 806
 807         //print(JSON.stringify(this.ts,null,4));
 808         //assert token.getType() == Token.LP; (
 809         //token = this.ts.nextTok();
 810         //assert token.getType() == Token.NAME;
 811
 812         symbol = token.items[0][0].data;
 813
 814
 815         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 816             // We must declare the exception identifier in the containing function
 817             // scope to avoid errors related to the obfuscation process. No need to
 818             // display a warning if the symbol was already declared here...
 819             scope.declareIdentifier(symbol, token.items[0][0]);
 820         } else {
 821             //?? why inc the refcount?? - that should be set when building the tree???
 822             identifier = this.getIdentifier(symbol, scope, token.items[0][0]);
 823             identifier.refcount++;
 824         }
 825
 826         token = this.ts.nextTok();
 827         //assert token.getType() == Token.RP; // )
 828     },
 829
 830     parseFunctionDeclaration : function(scope)
 831     {
 832         //print("PARSE FUNCTION");
 833         var symbol;
 834         var token;
 835
 836         var fnScope = false;
 837         var identifier;
 838         var b4braceNesting = this.braceNesting + 0;
 839
 840         //this.logR("<B>PARSING FUNCTION</B>");
 841
 842
 843         token = this.ts.nextTok();
 844         if (token.type == "NAME") {
 845             if (this.mode == 'BUILDING_SYMBOL_TREE') {
 846                 // Get the name of the function and declare it in the current scope.
 847                 symbol = token.data;
 848                 if (scope.getIdentifier(symbol,token) != false) {
 849                     this.warn("The function " + symbol + " has already been declared in the same scope...", true);
 850                 }
 851                 scope.declareIdentifier(symbol,token);
 852             }
 853             token =  this.ts.nextTok();
 854         }
 855
 856
 857         // return function() {....
 858         while (token.data != "(") {
 859             //print(token.toString());
 860             token =  this.ts.nextTok();
 861
 862
 863
 864         }
 865
 866
 867         //assert token.getType() == Token.LP;
 868         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 869             fnScope = new Scope(1, scope, token.n, '', token);
 870
 871             //println("STORING SCOPE" + this.ts.cursor);
 872
 873             this.indexedScopes[token.id] = fnScope;
 874
 875         } else {
 876             //qln("FETCHING SCOPE" + this.ts.cursor);
 877             fnScope = this.indexedScopes[token.id];
 878         }
 879         //if (this.mode == 'BUILDING_SYMBOL_TREE')
 880         //  print('FUNC-PARSE:' + JSON.stringify(token,null,4));
 881         // Parse function arguments.
 882         var args = token.items;
 883         for (var argpos =0; argpos < args.length; argpos++) {
 884
 885             token = args[argpos][0];
 886             //print ("FUNC ARGS: " + token.toString())
 887             //assert token.getType() == Token.NAME ||
 888             //        token.getType() == Token.COMMA;
 889             if (token.type == 'NAME' && this.mode == 'BUILDING_SYMBOL_TREE') {
 890                 symbol = token.data;
 891                 identifier = fnScope.declareIdentifier(symbol,token);
 892                 if (symbol == "$super" && argpos == 0) {
 893                     // Exception for Prototype 1.6...
 894                     identifier.preventMunging();
 895                 }
 896                 //argpos++;
 897             }
 898         }
 899
 900         token = this.ts.nextTok();
 901         //print('FUNC-BODY:' + JSON.stringify(token.items,null,4));
 902         //Seed.quit();
 903         //print(token.toString());
 904         // assert token.getType() == Token.LC;
 905         //this.braceNesting++;
 906
 907         //token = this.ts.nextTok();
 908         //print(token.toString());
 909         var outTS = this.ts;
 910         var _this = this;
 911         token.items.forEach(function(tar) {
 912             _this.ts = new TokenStream(tar);
 913             _this.parseScope(fnScope);
 914
 915
 916         });
 917
 918         //print(JSON.stringify(this.ts,null,4));
 919         //this.parseScope(fnScope);
 920         this.ts = outTS;
 921         // now pop it off the stack!!!
 922
 923         //this.braceNesting = b4braceNesting;
 924         //print("ENDFN -1: " + this.ts.lookTok(-1).toString());
 925         //print("ENDFN 0: " + this.ts.lookTok(0).toString());
 926         //print("ENDFN 1: " + this.ts.lookTok(1).toString());
 927     },
 928
 929     protectScopeFromObfuscation : function(scope) {
 930             //assert scope != null;
 931
 932         if (scope == this.globalScope) {
 933             // The global scope does not get obfuscated,
 934             // so we don't need to worry about it...
 935             return;
 936         }
 937
 938         // Find the highest local scope containing the specified scope.
 939         while (scope && scope.parent != this.globalScope) {
 940             scope = scope.parent;
 941         }
 942
 943         //assert scope.getParentScope() == globalScope;
 944         scope.preventMunging();
 945     },
 946
 947     getIdentifier: function(symbol, scope, token) {
 948         var identifier;
 949         while (scope != false) {
 950             identifier = scope.getIdentifier(symbol, token);
 951             //println("ScopeParser.getIdentgetUsedSymbols("+symbol+")=" + scope.getUsedSymbols().join(','));
 952             if (identifier) {
 953                 return identifier;
 954             }
 955             scope = scope.parent;
 956         }
 957         return false;
 958     }
 959 };