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

   1 //<Script type="text/javascript">
   2
   3 Scope = imports['JSDOC/Scope.js'].Scope;
   4
   5 /**
   6 * Scope stuff
   7 *
   8 * // FIXME - I need this to do next() without doccomments..
   9 */
  10
  11 ScopeParser = function(ts) {
  12     this.ts = ts; // {TokenStream}
  13     this.warnings = [];
  14     this.scopes = [];
  15     this.indexedScopes = {};
  16     this.timer = new Date() * 1;
  17     this.debug = false;
  18 }
  19
  20 // list of keywords that should not be used in object literals.
  21 ScopeParser.idents = [
  22         "break",
  23         "case",
  24         "continue",
  25         "default",
  26         "delete",
  27         "do",
  28         "else",
  29         "export",
  30         "false",
  31         "for",
  32         "function",
  33         "if",
  34         "import",
  35         "in",
  36         "new",
  37         "null",
  38         "return",
  39         "switch",
  40         "this",
  41         "true",
  42         "typeof",
  43         "var",
  44         "void",
  45         "while",
  46         "with",
  47
  48         "catch",
  49         "class",
  50         "const",
  51         "debugger",
  52         "enum",
  53         "extends",
  54         "finally",
  55         "super",
  56         "throw",
  57         "try",
  58
  59         "abstract",
  60         "boolean",
  61         "byte",
  62         "char",
  63         "double",
  64         "final",
  65         "float",
  66         "goto",
  67         "implements",
  68         "instanceof",
  69         "int",
  70         "interface",
  71         "long",
  72         "native",
  73         "package",
  74         "private",
  75         "protected",
  76         "public",
  77         "short",
  78         "static",
  79         "synchronized",
  80         "throws",
  81         "transient",
  82                 "include",
  83                 "undefined"
  84 ];
  85
  86
  87 ScopeParser.prototype = {
  88     timer: 0,
  89     timerPrint: function (str) {
  90         var ntime = new Date() * 1;
  91         var tdif =  ntime -this.timer;
  92         this.timer = ntime;
  93         var pref = '';
  94         if (tdif > 100) { //slower ones..
  95             pref = '***';
  96         }
  97         println(pref+'['+tdif+']'+str);
  98
  99     },
 100     warn: function(s) {
 101         //print('****************' + s);
 102         this.warnings.push(s);
 103         //println("WARNING:" + htmlescape(s) + "<BR>");
 104     },
 105     // defaults should not be initialized here =- otherwise they get duped on new, rather than initalized..
 106     warnings : false,
 107     ts : false,
 108     scopes : false,
 109     global : false,
 110     mode : "", //"BUILDING_SYMBOL_TREE",
 111     braceNesting : 0,
 112     indexedScopes : false,
 113     munge: true,
 114
 115
 116
 117
 118
 119     buildSymbolTree : function()
 120     {
 121         //println("<PRE>");
 122
 123         this.ts.rewind();
 124         this.braceNesting = 0;
 125         this.scopes = [];
 126
 127
 128
 129
 130         this.globalScope = new  Scope(-1, false, -1, '');
 131         indexedScopes = { 0 : this.globalScope };
 132
 133         this.mode = 'BUILDING_SYMBOL_TREE';
 134         this.parseScope(this.globalScope);
 135
 136         //print("---------------END PASS 1 ---------------- ");
 137
 138     },
 139     mungeSymboltree : function()
 140     {
 141
 142         if (!this.munge) {
 143             return;
 144         }
 145
 146         // One problem with obfuscation resides in the use of undeclared
 147         // and un-namespaced global symbols that are 3 characters or less
 148         // in length. Here is an example:
 149         //
 150         //     var declaredGlobalVar;
 151         //
 152         //     function declaredGlobalFn() {
 153         //         var localvar;
 154         //         localvar = abc; // abc is an undeclared global symbol
 155         //     }
 156         //
 157         // In the example above, there is a slim chance that localvar may be
 158         // munged to 'abc', conflicting with the undeclared global symbol
 159         // abc, creating a potential bug. The following code detects such
 160         // global symbols. This must be done AFTER the entire file has been
 161         // parsed, and BEFORE munging the symbol tree. Note that declaring
 162         // extra symbols in the global scope won't hurt.
 163         //
 164         // Note: Since we go through all the tokens to do this, we also use
 165         // the opportunity to count how many times each identifier is used.
 166
 167         this.ts.rewind();
 168         this.braceNesting = 0;
 169         this.scopes= [];
 170         this.mode = 'PASS2_SYMBOL_TREE';
 171
 172         //println("MUNGING?");
 173
 174         this.parseScope(this.globalScope);
 175         this.globalScope.munge();
 176     },
 177
 178
 179     log : function(str)
 180     {
 181         print ("                    ".substring(0, this.braceNesting*2) + str);
 182
 183         //println("<B>LOG:</B>" + htmlescape(str) + "<BR/>\n");
 184     },
 185     logR : function(str)
 186     {
 187             //println("<B>LOG:</B>" + str + "<BR/>");
 188     },
 189
 190
 191     dumpLine : false,
 192     dumpToken: function (tok, scope, brace) {
 193         if (this.dumpLine == false) {
 194             this.dumpLine = {
 195                 str : '' +tok.data,
 196                 scope : scope.length,
 197                 brace : brace
 198             }
 199             return;
 200         }
 201
 202         if (this.dumpLine.scope == scope.length && this.dumpLine.brace == brace) {
 203             this.dumpLine.str += ' ' + tok.data;
 204             if (this.dumpLine.str.length > 80 || tok.data ==';') {
 205
 206                 print(
 207                 //    (new Array(this.dumpLine.scope)).join("  ") + '|' +
 208                     (new Array(this.dumpLine.brace+1)).join("  ") + this.dumpLine.str);
 209                 this.dumpLine.str = '';
 210             }
 211             return;
 212         }
 213
 214         print(
 215           //  (new Array(this.dumpLine.scope)).join("  ") + '|' +
 216             (new Array(this.dumpLine.brace+1)).join("  ") + this.dumpLine.str);
 217
 218
 219         this.dumpLine = {
 220             str : '' +tok.data,
 221             scope : scope.length,
 222             brace : brace
 223         }
 224
 225     },
 226
 227
 228
 229     parseScope : function(scope) // parse a token stream..
 230     {
 231         //this.timerPrint("parseScope EnterScope");
 232         //this.log(">>> ENTER SCOPE" + this.scopes.length);
 233         var symbol;
 234         var token;
 235
 236         var identifier;
 237
 238         var expressionBraceNesting = this.braceNesting + 0;
 239
 240         var parensNesting = 0;
 241
 242         var isObjectLitAr = [ false ];
 243         var isInObjectLitAr;
 244         this.scopes.push(scope);
 245
 246         var scopeIndent = '';
 247         this.scopes.forEach(function() {
 248             scopeIndent += '   ';
 249         });
 250         print(scopeIndent + ">> ENTER SCOPE");
 251
 252
 253
 254
 255         token = this.ts.lookTok(1);
 256         while (token) {
 257           //  this.timerPrint("parseScope AFTER lookT: " + token.toString());
 258             this.dumpToken(token , this.scopes, this.braceNesting);
 259             //this.log(token.data);
 260             if (token.type == 'NAME') {
 261             //    print('*' + token.data);
 262             }
 263             switch(token.type + '.' + token.name) {
 264                 case "KEYW.VAR":
 265                 case "KEYW.CONST": // not really relivant as it's only mozzy that does this.
 266
 267                     //this.log("parseScope GOT VAR/CONST : " + token.toString());
 268                     while (true) {
 269                         token = this.ts.nextTok();
 270                         !this.debug|| print( token.toString());
 271
 272                         if (!token) { // can return false at EOF!
 273                             break;
 274                         }
 275                         if (token.name == "VAR" || token.data == ',') { // kludge..
 276                             continue;
 277                         }
 278                         //this.logR("parseScope GOT VAR  : <B>" + token.toString() + "</B>");
 279                         if (token.type !="NAME") {
 280                             for(var i = Math.max(this.ts.cursor-10,0); i < this.ts.cursor+1; i++) {
 281                                 print(this.ts.tokens[i].toString());
 282                             }
 283
 284                             print( "var without ident");
 285                             Seed.quit()
 286                         }
 287
 288
 289                         if (this.mode == "BUILDING_SYMBOL_TREE") {
 290                             identifier = scope.getIdentifier(token.data) ;
 291
 292                             if (identifier == false) {
 293                                 scope.declareIdentifier(token.data, token);
 294                             } else {
 295                                 token.identifier = identifier;
 296                                 this.warn("(SCOPE) The variable " + token.data  + ' (line:' + token.line + ")  has already been declared in the same scope...");
 297                             }
 298                         }
 299
 300                         token = this.ts.nextTok();
 301                         !this.debug|| print(token.toString());
 302                         /*
 303                         assert token.getType() == Token.SEMI ||
 304                                 token.getType() == Token.ASSIGN ||
 305                                 token.getType() == Token.COMMA ||
 306                                 token.getType() == Token.IN;
 307                         */
 308                         if (token.name == "IN") {
 309                             break;
 310                         } else {
 311                             //var bn = this.braceNesting;
 312                             this.parseExpression();
 313                             //this.braceNesting = bn;
 314                             //this.logR("parseScope DONE  : <B>ParseExpression</B> - tok is:" + this.ts.lookT(0).toString());
 315
 316                             token = this.ts.lookTok(1);
 317                             !this.debug|| print("AFTER EXP: " + token.toString());
 318                             if (token.data == ';') {
 319                                 break;
 320                             }
 321                         }
 322                     }
 323                     break;
 324                 case "KEYW.FUNCTION":
 325                     //println("<i>"+token.data+"</i>");
 326                      var bn = this.braceNesting;
 327                     this.parseFunctionDeclaration();
 328                      this.braceNesting = bn;
 329                     break;
 330
 331                 case "PUNC.LEFT_CURLY": // {
 332                     //println("<i>"+token.data+"</i>");
 333                     isObjectLitAr.push(false);
 334                     this.braceNesting++;
 335
 336                     //print(">>>>>> OBJLIT PUSH(false)" + this.braceNesting);
 337                     break;
 338
 339                 case "PUNC.RIGHT_CURLY": // }
 340                     //println("<i>"+token.data+"</i>");
 341                     this.braceNesting--;
 342                     isObjectLitAr.pop();
 343                     //print(">>>>>> OBJLIT POP"+ this.braceNesting);
 344                         //assert braceNesting >= scope.getBra ceNesting();
 345
 346                     if (this.braceNesting < expressionBraceNesting) {
 347                         var ls = this.scopes.pop();
 348                         ls.getUsedSymbols();
 349                         // eat symbol if we are currently at {
 350                         if (this.ts.look(0).data == '{') {
 351                             this.ts.nextTok();
 352                         }
 353
 354                         //print("<<<<<<<EXIT SCOPE" +this.scopes.length);
 355                         return;
 356                     }
 357                     break;
 358
 359                 case "KEYW.WITH":
 360                     //println("<i>"+token.data+"</i>");
 361                     if (this.mode == "BUILDING_SYMBOL_TREE") {
 362                         // Inside a 'with' block, it is impossible to figure out
 363                         // statically whether a symbol is a local variable or an
 364                         // object member. As a consequence, the only thing we can
 365                         // do is turn the obfuscation off for the highest scope
 366                         // containing the 'with' block.
 367                         this.protectScopeFromObfuscation(scope);
 368                         this.warn("Using 'with' is not recommended." + (this.munge ? " Moreover, using 'with' reduces the level of compression!" : ""), true);
 369                     }
 370                     break;
 371
 372                 case "KEYW.CATCH":
 373                     //println("<i>"+token.data+"</i>");
 374                     this.parseCatch();
 375                     break;
 376                 /*
 377                 case Token.SPECIALCOMMENT:
 378                         if (mode == BUILDING_SYMBOL_TREE) {
 379                             protectScopeFromObfuscation(scope);
 380                             this.warn("Using JScript conditional comments is not recommended." + (munge ? " Moreover, using JScript conditional comments reduces the level of compression." : ""), true);
 381                         }
 382                         break;
 383                 */
 384
 385                 case "STRN.DOUBLE_QUOTE": // used for object lit detection..
 386                 case "STRN.SINGLE_QUOTE":
 387                     //println("<i>"+token.data+"</i>");
 388                     if (this.ts.lookTok(-1).data == '{' && this.ts.lookTok(1).data == ':') {
 389                         // then we are in an object lit.. -> we need to flag the brace as such...
 390                         isObjectLitAr.pop();
 391                         isObjectLitAr.push(true);
 392                         //print(">>>>>> OBJLIT REPUSH(true)");
 393                     }
 394                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 395
 396                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ':' &&
 397                         ( this.ts.lookTok(-1).data == '{'  ||  this.ts.lookTok(-1).data == ':' )) {
 398                         // see if we can replace..
 399                         // remove the quotes..
 400                         // should do a bit more checking!!!! (what about wierd char's in the string..
 401                         var str = token.data.substring(1,token.data.length-1);
 402                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 403                             token.outData = str;
 404                         }
 405
 406
 407
 408                     }
 409
 410
 411
 412                     break;
 413
 414                 case "NAME.NAME":
 415
 416                     //print("DEAL WITH NAME:");
 417                     // got identifier..
 418
 419                     // look for  { ** : <- indicates obj literal.. ** this could occur with numbers ..
 420                     if ((this.ts.lookTok(-1).data == "{") && (this.ts.lookTok(1).data == ":")) {
 421                         isObjectLitAr.pop();
 422                         isObjectLitAr.push(true);
 423                         //print(">>>>>> OBJLIT REPUSH(true)");
 424                         //println("<i>"+token.data+"</i>");
 425                         break;
 426                     }
 427                    // print("DEAL WITH obj lit:");
 428                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 429
 430                     if (isInObjectLitAr && (this.ts.lookTok(1).data == ":") && (this.ts.lookTok(-1).data == ",")) {
 431                         // skip, it's an object lit key..
 432                         //println("<i>"+token.data+"</i>");
 433                         break;
 434                     }
 435
 436
 437                     // skip anyting with "." before it..!!
 438
 439                     if (this.ts.lookTok(-1).data == ".") {
 440                         // skip, it's an object prop.
 441                         //println("<i>"+token.data+"</i>");
 442                         break;
 443                     }
 444                     symbol = token.data;
 445                     if (this.mode == 'PASS2_SYMBOL_TREE') {
 446
 447                         //println("GOT IDENT: -2 : " + this.ts.lookT(-2).toString() + " <BR> ..... -1 :  " +  this.ts.lookT(-1).toString() + " <BR> ");
 448
 449                         //print ("MUNGE?" + symbol);
 450
 451                         //println("GOT IDENT: <B>" + symbol + "</B><BR/>");
 452
 453                             //println("GOT IDENT (2): <B>" + symbol + "</B><BR/>");
 454                         identifier = this.getIdentifier(symbol, scope);
 455
 456                         if (identifier == false) {
 457 // BUG!find out where builtin is defined...
 458                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 459                                 // Here, we found an undeclared and un-namespaced symbol that is
 460                                 // 3 characters or less in length. Declare it in the global scope.
 461                                 // We don't need to declare longer symbols since they won't cause
 462                                 // any conflict with other munged symbols.
 463                                 this.globalScope.declareIdentifier(symbol, token);
 464                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 465                             }
 466
 467                             //println("GOT IDENT IGNORE(3): <B>" + symbol + "</B><BR/>");
 468                         } else {
 469                             token.identifier = identifier;
 470                             identifier.refcount++;
 471                         }
 472                     }
 473
 474                     break;
 475                     //println("<B>SID</B>");
 476                 default:
 477                     if (token.type != 'KEYW') {
 478                         break;
 479                     }
 480                    // print("Check eval:");
 481
 482                     symbol = token.data;
 483
 484                      if (this.mode == 'BUILDING_SYMBOL_TREE') {
 485
 486                         if (symbol == "eval") {
 487                             // look back one and see if we can find a comment!!!
 488                             if (this.ts.look(-1).type == "COMM") {
 489                                 // look for eval:var:noreplace\n
 490                                 var _t = this;
 491                                 this.ts.look(-1).data.replace(/eval:var:([a-z_]+)/ig, function(m, a) {
 492
 493                                     var hi = _t.getIdentifier(a, scope);
 494                                    // println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 495                                     if (hi) {
 496                                      //   println("PROTECT "+a+" from munge");
 497                                         hi.toMunge = false;
 498                                     }
 499
 500                                 });
 501
 502
 503                             } else {
 504
 505
 506                                 this.protectScopeFromObfuscation(scope);
 507                                 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);
 508                             }
 509
 510                         }
 511
 512                     }
 513                     break;
 514
 515
 516             } // end switch
 517
 518
 519             //this.timerPrint("parseScope TOK : " + token.toString());
 520             token = this.ts.nextTok();
 521             //if (this.ts.nextT()) break;
 522
 523         }
 524         //print("<<<<<<<EXIT SCOPE ERR?" +this.scopes.length);
 525     },
 526
 527
 528     parseExpression : function() {
 529
 530         // Parse the expression until we encounter a comma or a semi-colon
 531         // in the same brace nesting, bracket nesting and paren nesting.
 532         // Parse functions if any...
 533         //println("<i>EXP</i><BR/>");
 534         !this.debug || print("PARSE EXPR");
 535
 536
 537         // for printing stuff..
 538
 539
 540
 541         var symbol;
 542         var token;
 543         var currentScope;
 544         var identifier;
 545
 546         var expressionBraceNesting = this.braceNesting;
 547         var bracketNesting = 0;
 548         var parensNesting = 0;
 549         var isInObjectLitAr;
 550         var isObjectLitAr = [ false ];
 551
 552         currentScope = this.scopes[this.scopes.length-1];
 553
 554         var scopeIndent = '';
 555         this.scopes.forEach(function() {
 556             scopeIndent += '   ';
 557         });
 558         print(scopeIndent + ">> ENTER EXPRESSION");
 559         while (token = this.ts.lookTok()) {
 560
 561
 562
 563            /*
 564             // moved out of loop?
 565            currentScope = this.scopes[this.scopes.length-1];
 566
 567             var scopeIndent = '';
 568             this.scopes.forEach(function() {
 569                 scopeIndent += '   ';
 570             });
 571            */
 572
 573            this.dumpToken(token,  this.scopes, this.braceNesting );
 574
 575
 576             //println("<i>"+token.data+"</i>");
 577             //this.log("EXP:" + token.data);
 578             switch (token.type) {
 579                 case 'PUNC':
 580                     switch(token.data) {
 581
 582                         case ';':
 583                         case ',':
 584                             if (this.braceNesting == expressionBraceNesting &&
 585                                     bracketNesting == 0 &&
 586                                     parensNesting == 0) {
 587                                 print(scopeIndent + "<< EXIT EXPRESSION");
 588                                 return;
 589                             }
 590                             break;
 591
 592
 593
 594                         case '{': //Token.LC:
 595                             isObjectLitAr.push(false);
 596
 597                             this.braceNesting++;
 598                             ///print(">>>>> EXP PUSH(false)"+this.braceNesting);
 599                             break;
 600
 601                         case '}': //Token.RC:
 602                             this.braceNesting--;
 603                             isObjectLitAr.pop();
 604                             //print(">>>>> EXP POP" + this.braceNesting);
 605                            // assert braceNesting >= expressionBraceNesting;
 606                             break;
 607
 608                         case '[': //Token.LB:
 609                             bracketNesting++;
 610                             break;
 611
 612                         case ']': //Token.RB:
 613                             bracketNesting--;
 614                             break;
 615
 616                         case '(': //Token.LP:
 617                             parensNesting++;
 618                             break;
 619
 620                         case ')': //Token.RP:
 621                             parensNesting--;
 622                             break;
 623                     }
 624                     break;
 625
 626                 case 'STRN': // used for object lit detection..
 627                     if (this.ts.lookTok(-1).data == "{" && this.ts.lookTok(1).data == ":" ) {
 628                         // then we are in an object lit.. -> we need to flag the brace as such...
 629                         isObjectLitAr.pop();
 630                         isObjectLitAr.push(true);
 631                         //print(">>>>> EXP PUSH(true)");
 632                     }
 633
 634
 635
 636                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 637                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ":"  &&
 638                         ( this.ts.lookTok(-1).data == "{"  ||  this.ts.lookTok(-1).data == "," )) {
 639                         // see if we can replace..
 640                         // remove the quotes..
 641                         var str = token.data.substring(1,token.data.length-1);
 642                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 643                             token.outData = str;
 644                         }
 645
 646
 647
 648                     }
 649
 650                     break;
 651
 652
 653
 654                 case 'NAME':
 655
 656                     symbol = token.data;
 657                     //print("in NAME = " + token.toString());
 658                     //print("in NAME 0: " + this.ts.look(0).toString());
 659                     //print("in NAME 2: " + this.ts.lookTok(2).toString());
 660                     if (this.ts.look(0).data == "{"  && this.ts.lookTok(2).data == ":") {
 661                         // then we are in an object lit.. -> we need to flag the brace as such...
 662                         isObjectLitAr.pop();
 663                         isObjectLitAr.push(true);
 664                          //print(">>>>> EXP  PUSH(true)");
 665                         break;
 666                     }
 667
 668                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 669                     //print ("isInObjectLitAr : " + isInObjectLitAr + ' ' + token.toString());
 670
 671                     if (isInObjectLitAr && this.ts.lookTok(0).data == "," && this.ts.lookTok(2).data == ":") {
 672                         break;
 673                     }
 674                     //print(this.ts.lookTok(0).data);
 675                     if (this.ts.lookTok(0).data == ".") {
 676                         //skip '.'
 677                         break;
 678                     }
 679
 680                      if (this.mode == 'PASS2_SYMBOL_TREE') {
 681
 682                         identifier = this.getIdentifier(symbol, currentScope);
 683                         //println("<B>??</B>");
 684                         if (identifier == false) {
 685
 686                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 687                                 // Here, we found an undeclared and un-namespaced symbol that is
 688                                 // 3 characters or less in length. Declare it in the global scope.
 689                                 // We don't need to declare longer symbols since they won't cause
 690                                 // any conflict with other munged symbols.
 691                                 this.globalScope.declareIdentifier(symbol, token);
 692                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 693                             } else {
 694                                 //println("undeclared")
 695                             }
 696
 697
 698                         } else {
 699                             //println("<B>++</B>");
 700                             token.identifier = identifier;
 701                             identifier.refcount++;
 702                         }
 703
 704                     }
 705                     break;
 706
 707
 708
 709
 710                     //println("<B>EID</B>");
 711                  case 'KEYW':
 712
 713                     if (token.name == "FUNCTION") {
 714
 715                         this.parseFunctionDeclaration();
 716                         break;
 717                     }
 718
 719
 720
 721                     symbol = token.data;
 722                     if (this.mode == 'BUILDING_SYMBOL_TREE') {
 723
 724                         if (symbol == "eval") {
 725                             if (this.ts.look(-1).type == 'COMM') {
 726                                 // look for eval:var:noreplace\n
 727                                 var _t = this;
 728                                 this.ts.look(-1).data.replace(/eval:var:([a-z]+)/ig, function(m, a) {
 729                                     var hi = _t.getIdentifier(a, currentScope);
 730                                    //println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 731                                     if (hi) {
 732                                       //  println("PROTECT "+a+" from munge");
 733                                         hi.toMunge = false;
 734                                     }
 735
 736
 737                                 });
 738
 739                             } else {
 740                                 this.protectScopeFromObfuscation(currentScope);
 741                                 this.warn("Using 'eval' is not recommended." + (this.munge ? " Moreover, using 'eval' reduces the level of compression!" : ""), true);
 742                             }
 743
 744
 745                         }
 746                         break;
 747                     }
 748
 749             }
 750             if (!this.ts.nextTok()) break;
 751         }
 752         print(scopeIndent + "<< EXIT EXPRESSION");
 753     },
 754
 755
 756     parseCatch : function() {
 757
 758         var symbol;
 759         var token;
 760         var currentScope;
 761         var identifier;
 762
 763         //token = getToken(-1);
 764         //assert token.getType() == Token.CATCH;
 765         token = this.ts.nextTok();
 766         //assert token.getType() == Token.LP; (
 767         token = this.ts.nextTok();
 768         //assert token.getType() == Token.NAME;
 769
 770         symbol = token.data;
 771         currentScope = this.scopes[this.scopes.length-1];
 772
 773         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 774             // We must declare the exception identifier in the containing function
 775             // scope to avoid errors related to the obfuscation process. No need to
 776             // display a warning if the symbol was already declared here...
 777             currentScope.declareIdentifier(symbol, token);
 778         } else {
 779             //?? why inc the refcount?? - that should be set when building the tree???
 780             identifier = this.getIdentifier(symbol, currentScope);
 781             identifier.refcount++;
 782         }
 783
 784         token = this.ts.nextTok();
 785         //assert token.getType() == Token.RP; // )
 786     },
 787
 788     parseFunctionDeclaration : function()
 789     {
 790         print("PARSE FUNCTION");
 791         var symbol;
 792         var token;
 793         var currentScope  = false;
 794         var fnScope = false;
 795         var identifier;
 796         //this.logR("<B>PARSING FUNCTION</B>");
 797         currentScope = this.scopes[this.scopes.length-1];
 798
 799         token = this.ts.nextTok();
 800         if (token.type == "NAME") {
 801             if (this.mode == 'BUILDING_SYMBOL_TREE') {
 802                 // Get the name of the function and declare it in the current scope.
 803                 symbol = token.data;
 804                 if (currentScope.getIdentifier(symbol) != false) {
 805                     this.warn("The function " + symbol + " has already been declared in the same scope...", true);
 806                 }
 807                 currentScope.declareIdentifier(symbol,token);
 808             }
 809             token =  this.ts.nextTok();
 810         }
 811
 812         //assert token.getType() == Token.LP;
 813         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 814             fnScope = new Scope(this.braceNesting, currentScope, token.n, '');
 815
 816             //println("STORING SCOPE" + this.ts.cursor);
 817
 818             this.indexedScopes[this.ts.cursor] = fnScope;
 819
 820         } else {
 821             //qln("FETCHING SCOPE" + this.ts.cursor);
 822             fnScope = this.indexedScopes[this.ts.cursor];
 823
 824         }
 825
 826         // Parse function arguments.
 827         var argpos = 0;
 828         while (this.ts.lookTok().data != ')') { //(token = consumeToken()).getType() != Token.RP) {
 829             token = this.ts.nextTok();
 830            // print ("FUNC ARGS: " + token.toString())
 831             //assert token.getType() == Token.NAME ||
 832             //        token.getType() == Token.COMMA;
 833             if (token.type == 'NAME' && this.mode == 'BUILDING_SYMBOL_TREE') {
 834                 symbol = token.data;
 835                 identifier = fnScope.declareIdentifier(symbol,token);
 836                 if (symbol == "$super" && argpos == 0) {
 837                     // Exception for Prototype 1.6...
 838                     identifier.preventMunging();
 839                 }
 840                 argpos++;
 841             }
 842         }
 843
 844         token = this.ts.nextTok();
 845         print(token.toString());
 846         // assert token.getType() == Token.LC;
 847         this.braceNesting++;
 848
 849         token = this.ts.nextTok();
 850         print(token.toString());
 851         if (token.type == "STRN" && this.ts.lookTok(1).data == ';') {
 852             /*
 853
 854             NOT SUPPORTED YET!?!!?!
 855
 856             // This is a hint. Hints are empty statements that look like
 857             // "localvar1:nomunge, localvar2:nomunge"; They allow developers
 858             // to prevent specific symbols from getting obfuscated (some heretic
 859             // implementations, such as Prototype 1.6, require specific variable
 860             // names, such as $super for example, in order to work appropriately.
 861             // Note: right now, only "nomunge" is supported in the right hand side
 862             // of a hint. However, in the future, the right hand side may contain
 863             // other values.
 864             consumeToken();
 865             String hints = token.getValue();
 866             // Remove the leading and trailing quotes...
 867             hints = hints.substring(1, hints.length() - 1).trim();
 868             StringTokenizer st1 = new StringTokenizer(hints, ",");
 869             while (st1.hasMoreTokens()) {
 870                 String hint = st1.nextToken();
 871                 int idx = hint.indexOf(':');
 872                 if (idx <= 0 || idx >= hint.length() - 1) {
 873                     if (mode == BUILDING_SYMBOL_TREE) {
 874                         // No need to report the error twice, hence the test...
 875                         this.warn("Invalid hint syntax: " + hint, true);
 876                     }
 877                     break;
 878                 }
 879                 String variableName = hint.substring(0, idx).trim();
 880                 String variableType = hint.substring(idx + 1).trim();
 881                 if (mode == BUILDING_SYMBOL_TREE) {
 882                     fnScope.addHint(variableName, variableType);
 883                 } else if (mode == CHECKING_SYMBOL_TREE) {
 884                     identifier = fnScope.getIdentifier(variableName);
 885                     if (identifier != null) {
 886                         if (variableType.equals("nomunge")) {
 887                             identifier.preventMunging();
 888                         } else {
 889                             this.warn("Unsupported hint value: " + hint, true);
 890                         }
 891                     } else {
 892                         this.warn("Hint refers to an unknown identifier: " + hint, true);
 893                     }
 894                 }
 895             }
 896             */
 897         }
 898
 899         this.parseScope(fnScope);
 900         // now pop it off the stack!!!
 901
 902         this.braceNesting--;
 903
 904     },
 905
 906     protectScopeFromObfuscation : function(scope) {
 907             //assert scope != null;
 908
 909         if (scope == this.globalScope) {
 910             // The global scope does not get obfuscated,
 911             // so we don't need to worry about it...
 912             return;
 913         }
 914
 915         // Find the highest local scope containing the specified scope.
 916         while (scope && scope.parent != this.globalScope) {
 917             scope = scope.parent;
 918         }
 919
 920         //assert scope.getParentScope() == globalScope;
 921         scope.preventMunging();
 922     },
 923
 924     getIdentifier: function(symbol, scope) {
 925         var identifier;
 926         while (scope != false) {
 927             identifier = scope.getIdentifier(symbol);
 928             //println("ScopeParser.getIdentgetUsedSymbols("+symbol+")=" + scope.getUsedSymbols().join(','));
 929             if (identifier) {
 930                 return identifier;
 931             }
 932             scope = scope.parent;
 933         }
 934         return false;
 935     }
 936 };