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                             var bn = this.braceNesting;
 313                             this.parseExpression();
 314                             this.braceNesting = bn;
 315                             //this.braceNesting = bn;
 316                             //this.logR("parseScope DONE  : <B>ParseExpression</B> - tok is:" + this.ts.lookT(0).toString());
 317
 318                             token = this.ts.lookTok(1);
 319                             !this.debug|| print("AFTER EXP: " + token.toString());
 320                             if (token.data == ';') {
 321                                 break;
 322                             }
 323                         }
 324                     }
 325                     break;
 326                 case "KEYW.FUNCTION":
 327                     //println("<i>"+token.data+"</i>");
 328                      var bn = this.braceNesting;
 329                     this.parseFunctionDeclaration();
 330                      this.braceNesting = bn;
 331                     break;
 332
 333                 case "PUNC.LEFT_CURLY": // {
 334                     //println("<i>"+token.data+"</i>");
 335                     isObjectLitAr.push(false);
 336                     this.braceNesting++;
 337
 338                     //print(">>>>>> OBJLIT PUSH(false)" + this.braceNesting);
 339                     break;
 340
 341                 case "PUNC.RIGHT_CURLY": // }
 342                     //println("<i>"+token.data+"</i>");
 343                     this.braceNesting--;
 344                     isObjectLitAr.pop();
 345                     //print(">>>>>> OBJLIT POP"+ this.braceNesting);
 346                         //assert braceNesting >= scope.getBra ceNesting();
 347
 348                     if (this.braceNesting < expressionBraceNesting) {
 349                         var ls = this.scopes.pop();
 350                         ls.getUsedSymbols();
 351                         // eat symbol if we are currently at {
 352                         if (this.ts.look(0).data == '{') {
 353                             this.ts.nextTok();
 354                         }
 355
 356                         print("<<<<<<<EXIT SCOPE" +this.scopes.length);
 357                         return;
 358                     }
 359                     break;
 360
 361                 case "KEYW.WITH":
 362                     //println("<i>"+token.data+"</i>");
 363                     if (this.mode == "BUILDING_SYMBOL_TREE") {
 364                         // Inside a 'with' block, it is impossible to figure out
 365                         // statically whether a symbol is a local variable or an
 366                         // object member. As a consequence, the only thing we can
 367                         // do is turn the obfuscation off for the highest scope
 368                         // containing the 'with' block.
 369                         this.protectScopeFromObfuscation(scope);
 370                         this.warn("Using 'with' is not recommended." + (this.munge ? " Moreover, using 'with' reduces the level of compression!" : ""), true);
 371                     }
 372                     break;
 373
 374                 case "KEYW.CATCH":
 375                     //println("<i>"+token.data+"</i>");
 376                     this.parseCatch();
 377                     break;
 378                 /*
 379                 case Token.SPECIALCOMMENT:
 380                         if (mode == BUILDING_SYMBOL_TREE) {
 381                             protectScopeFromObfuscation(scope);
 382                             this.warn("Using JScript conditional comments is not recommended." + (munge ? " Moreover, using JScript conditional comments reduces the level of compression." : ""), true);
 383                         }
 384                         break;
 385                 */
 386
 387                 case "STRN.DOUBLE_QUOTE": // used for object lit detection..
 388                 case "STRN.SINGLE_QUOTE":
 389                     //println("<i>"+token.data+"</i>");
 390                     if (this.ts.lookTok(-1).data == '{' && this.ts.lookTok(1).data == ':') {
 391                         // then we are in an object lit.. -> we need to flag the brace as such...
 392                         isObjectLitAr.pop();
 393                         isObjectLitAr.push(true);
 394                         //print(">>>>>> OBJLIT REPUSH(true)");
 395                     }
 396                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 397
 398                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ':' &&
 399                         ( this.ts.lookTok(-1).data == '{'  ||  this.ts.lookTok(-1).data == ':' )) {
 400                         // see if we can replace..
 401                         // remove the quotes..
 402                         // should do a bit more checking!!!! (what about wierd char's in the string..
 403                         var str = token.data.substring(1,token.data.length-1);
 404                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 405                             token.outData = str;
 406                         }
 407
 408
 409
 410                     }
 411
 412
 413
 414                     break;
 415
 416                 case "NAME.NAME":
 417
 418                     //print("DEAL WITH NAME:");
 419                     // got identifier..
 420
 421                     // look for  { ** : <- indicates obj literal.. ** this could occur with numbers ..
 422                     if ((this.ts.lookTok(-1).data == "{") && (this.ts.lookTok(1).data == ":")) {
 423                         isObjectLitAr.pop();
 424                         isObjectLitAr.push(true);
 425                         //print(">>>>>> OBJLIT REPUSH(true)");
 426                         //println("<i>"+token.data+"</i>");
 427                         break;
 428                     }
 429                    // print("DEAL WITH obj lit:");
 430                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 431
 432                     if (isInObjectLitAr && (this.ts.lookTok(1).data == ":") && (this.ts.lookTok(-1).data == ",")) {
 433                         // skip, it's an object lit key..
 434                         //println("<i>"+token.data+"</i>");
 435                         break;
 436                     }
 437
 438
 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                     symbol = token.data;
 447                     if (this.mode == 'PASS2_SYMBOL_TREE') {
 448
 449                         //println("GOT IDENT: -2 : " + this.ts.lookT(-2).toString() + " <BR> ..... -1 :  " +  this.ts.lookT(-1).toString() + " <BR> ");
 450
 451                         //print ("MUNGE?" + symbol);
 452
 453                         //println("GOT IDENT: <B>" + symbol + "</B><BR/>");
 454
 455                             //println("GOT IDENT (2): <B>" + symbol + "</B><BR/>");
 456                         identifier = this.getIdentifier(symbol, scope);
 457
 458                         if (identifier == false) {
 459 // BUG!find out where builtin is defined...
 460                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 461                                 // Here, we found an undeclared and un-namespaced symbol that is
 462                                 // 3 characters or less in length. Declare it in the global scope.
 463                                 // We don't need to declare longer symbols since they won't cause
 464                                 // any conflict with other munged symbols.
 465                                 this.globalScope.declareIdentifier(symbol, token);
 466                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 467                             }
 468
 469                             //println("GOT IDENT IGNORE(3): <B>" + symbol + "</B><BR/>");
 470                         } else {
 471                             token.identifier = identifier;
 472                             identifier.refcount++;
 473                         }
 474                     }
 475
 476                     break;
 477                     //println("<B>SID</B>");
 478                 default:
 479                     if (token.type != 'KEYW') {
 480                         break;
 481                     }
 482                    // print("Check eval:");
 483
 484                     symbol = token.data;
 485
 486                      if (this.mode == 'BUILDING_SYMBOL_TREE') {
 487
 488                         if (symbol == "eval") {
 489                             // look back one and see if we can find a comment!!!
 490                             if (this.ts.look(-1).type == "COMM") {
 491                                 // look for eval:var:noreplace\n
 492                                 var _t = this;
 493                                 this.ts.look(-1).data.replace(/eval:var:([a-z_]+)/ig, function(m, a) {
 494
 495                                     var hi = _t.getIdentifier(a, scope);
 496                                    // println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 497                                     if (hi) {
 498                                      //   println("PROTECT "+a+" from munge");
 499                                         hi.toMunge = false;
 500                                     }
 501
 502                                 });
 503
 504
 505                             } else {
 506
 507
 508                                 this.protectScopeFromObfuscation(scope);
 509                                 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);
 510                             }
 511
 512                         }
 513
 514                     }
 515                     break;
 516
 517
 518             } // end switch
 519
 520
 521             //print("parseScope TOK : " + token.toString());
 522             token = this.ts.nextTok();
 523             //if (this.ts.nextT()) break;
 524
 525         }
 526         //print("<<<<<<<EXIT SCOPE ERR?" +this.scopes.length);
 527     },
 528
 529
 530     parseExpression : function() {
 531
 532         // Parse the expression until we encounter a comma or a semi-colon
 533         // in the same brace nesting, bracket nesting and paren nesting.
 534         // Parse functions if any...
 535         //println("<i>EXP</i><BR/>");
 536         !this.debug || print("PARSE EXPR");
 537
 538
 539         // for printing stuff..
 540
 541
 542
 543         var symbol;
 544         var token;
 545         var currentScope;
 546         var identifier;
 547
 548         var expressionBraceNesting = this.braceNesting + 0;
 549         var bracketNesting = 0;
 550         var parensNesting = 0;
 551         var isInObjectLitAr;
 552         var isObjectLitAr = [ false ];
 553
 554         currentScope = this.scopes[this.scopes.length-1];
 555
 556         var scopeIndent = '';
 557         this.scopes.forEach(function() {
 558             scopeIndent += '   ';
 559         });
 560         print(scopeIndent + ">> ENTER EXPRESSION");
 561         while (token = this.ts.lookTok()) {
 562
 563
 564
 565            /*
 566             // moved out of loop?
 567            currentScope = this.scopes[this.scopes.length-1];
 568
 569             var scopeIndent = '';
 570             this.scopes.forEach(function() {
 571                 scopeIndent += '   ';
 572             });
 573            */
 574
 575            this.dumpToken(token,  this.scopes, this.braceNesting );
 576
 577
 578             //println("<i>"+token.data+"</i>");
 579             //this.log("EXP:" + token.data);
 580             switch (token.type) {
 581                 case 'PUNC':
 582                     switch(token.data) {
 583
 584                         case ';':
 585                         case ',':
 586                             if (this.braceNesting == expressionBraceNesting &&
 587                                     bracketNesting == 0 &&
 588                                     parensNesting == 0) {
 589                                 print(scopeIndent + "<< EXIT EXPRESSION");
 590                                 return;
 591                             }
 592                             break;
 593
 594
 595
 596                         case '{': //Token.LC:
 597                             isObjectLitAr.push(false);
 598
 599                             this.braceNesting++;
 600                             ///print(">>>>> EXP PUSH(false)"+this.braceNesting);
 601                             break;
 602
 603                         case '}': //Token.RC:
 604                             this.braceNesting--;
 605                             isObjectLitAr.pop();
 606                             //print(">>>>> EXP POP" + this.braceNesting);
 607                            // assert braceNesting >= expressionBraceNesting;
 608                             break;
 609
 610                         case '[': //Token.LB:
 611                             bracketNesting++;
 612                             break;
 613
 614                         case ']': //Token.RB:
 615                             bracketNesting--;
 616                             break;
 617
 618                         case '(': //Token.LP:
 619                             parensNesting++;
 620                             break;
 621
 622                         case ')': //Token.RP:
 623                             parensNesting--;
 624                             break;
 625                     }
 626                     break;
 627
 628                 case 'STRN': // used for object lit detection..
 629                     if (this.ts.lookTok(-1).data == "{" && this.ts.lookTok(1).data == ":" ) {
 630                         // then we are in an object lit.. -> we need to flag the brace as such...
 631                         isObjectLitAr.pop();
 632                         isObjectLitAr.push(true);
 633                         //print(">>>>> EXP PUSH(true)");
 634                     }
 635
 636
 637
 638                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 639                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ":"  &&
 640                         ( this.ts.lookTok(-1).data == "{"  ||  this.ts.lookTok(-1).data == "," )) {
 641                         // see if we can replace..
 642                         // remove the quotes..
 643                         var str = token.data.substring(1,token.data.length-1);
 644                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 645                             token.outData = str;
 646                         }
 647
 648
 649
 650                     }
 651
 652                     break;
 653
 654
 655
 656                 case 'NAME':
 657
 658                     symbol = token.data;
 659                     //print("in NAME = " + token.toString());
 660                     //print("in NAME 0: " + this.ts.look(0).toString());
 661                     //print("in NAME 2: " + this.ts.lookTok(2).toString());
 662                     if (this.ts.look(0).data == "{"  && this.ts.lookTok(2).data == ":") {
 663                         // then we are in an object lit.. -> we need to flag the brace as such...
 664                         isObjectLitAr.pop();
 665                         isObjectLitAr.push(true);
 666                          //print(">>>>> EXP  PUSH(true)");
 667                         break;
 668                     }
 669
 670                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 671                     //print ("isInObjectLitAr : " + isInObjectLitAr + ' ' + token.toString());
 672
 673                     if (isInObjectLitAr && this.ts.lookTok(0).data == "," && this.ts.lookTok(2).data == ":") {
 674                         break;
 675                     }
 676                     //print(this.ts.lookTok(0).data);
 677                     if (this.ts.lookTok(0).data == ".") {
 678                         //skip '.'
 679                         break;
 680                     }
 681
 682                      if (this.mode == 'PASS2_SYMBOL_TREE') {
 683
 684                         identifier = this.getIdentifier(symbol, currentScope);
 685                         //println("<B>??</B>");
 686                         if (identifier == false) {
 687
 688                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 689                                 // Here, we found an undeclared and un-namespaced symbol that is
 690                                 // 3 characters or less in length. Declare it in the global scope.
 691                                 // We don't need to declare longer symbols since they won't cause
 692                                 // any conflict with other munged symbols.
 693                                 this.globalScope.declareIdentifier(symbol, token);
 694                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 695                             } else {
 696                                 //println("undeclared")
 697                             }
 698
 699
 700                         } else {
 701                             //println("<B>++</B>");
 702                             token.identifier = identifier;
 703                             identifier.refcount++;
 704                         }
 705
 706                     }
 707                     break;
 708
 709
 710
 711
 712                     //println("<B>EID</B>");
 713                  case 'KEYW':
 714
 715                     if (token.name == "FUNCTION") {
 716
 717                         this.parseFunctionDeclaration();
 718                         break;
 719                     }
 720
 721
 722
 723                     symbol = token.data;
 724                     if (this.mode == 'BUILDING_SYMBOL_TREE') {
 725
 726                         if (symbol == "eval") {
 727                             if (this.ts.look(-1).type == 'COMM') {
 728                                 // look for eval:var:noreplace\n
 729                                 var _t = this;
 730                                 this.ts.look(-1).data.replace(/eval:var:([a-z]+)/ig, function(m, a) {
 731                                     var hi = _t.getIdentifier(a, currentScope);
 732                                    //println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 733                                     if (hi) {
 734                                       //  println("PROTECT "+a+" from munge");
 735                                         hi.toMunge = false;
 736                                     }
 737
 738
 739                                 });
 740
 741                             } else {
 742                                 this.protectScopeFromObfuscation(currentScope);
 743                                 this.warn("Using 'eval' is not recommended." + (this.munge ? " Moreover, using 'eval' reduces the level of compression!" : ""), true);
 744                             }
 745
 746
 747                         }
 748                         break;
 749                     }
 750
 751             }
 752             if (!this.ts.nextTok()) break;
 753         }
 754         print(scopeIndent + "<< EXIT EXPRESSION");
 755     },
 756
 757
 758     parseCatch : function() {
 759
 760         var symbol;
 761         var token;
 762         var currentScope;
 763         var identifier;
 764
 765         //token = getToken(-1);
 766         //assert token.getType() == Token.CATCH;
 767         token = this.ts.nextTok();
 768         //assert token.getType() == Token.LP; (
 769         token = this.ts.nextTok();
 770         //assert token.getType() == Token.NAME;
 771
 772         symbol = token.data;
 773         currentScope = this.scopes[this.scopes.length-1];
 774
 775         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 776             // We must declare the exception identifier in the containing function
 777             // scope to avoid errors related to the obfuscation process. No need to
 778             // display a warning if the symbol was already declared here...
 779             currentScope.declareIdentifier(symbol, token);
 780         } else {
 781             //?? why inc the refcount?? - that should be set when building the tree???
 782             identifier = this.getIdentifier(symbol, currentScope);
 783             identifier.refcount++;
 784         }
 785
 786         token = this.ts.nextTok();
 787         //assert token.getType() == Token.RP; // )
 788     },
 789
 790     parseFunctionDeclaration : function()
 791     {
 792         print("PARSE FUNCTION");
 793         var symbol;
 794         var token;
 795         var currentScope  = false;
 796         var fnScope = false;
 797         var identifier;
 798         var b4braceNesting = this.braceNesting + 0;
 799
 800         //this.logR("<B>PARSING FUNCTION</B>");
 801         currentScope = this.scopes[this.scopes.length-1];
 802
 803         token = this.ts.nextTok();
 804         if (token.type == "NAME") {
 805             if (this.mode == 'BUILDING_SYMBOL_TREE') {
 806                 // Get the name of the function and declare it in the current scope.
 807                 symbol = token.data;
 808                 if (currentScope.getIdentifier(symbol) != false) {
 809                     this.warn("The function " + symbol + " has already been declared in the same scope...", true);
 810                 }
 811                 currentScope.declareIdentifier(symbol,token);
 812             }
 813             token =  this.ts.nextTok();
 814         }
 815
 816         //assert token.getType() == Token.LP;
 817         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 818             fnScope = new Scope(this.braceNesting, currentScope, token.n, '');
 819
 820             //println("STORING SCOPE" + this.ts.cursor);
 821
 822             this.indexedScopes[this.ts.cursor] = fnScope;
 823
 824         } else {
 825             //qln("FETCHING SCOPE" + this.ts.cursor);
 826             fnScope = this.indexedScopes[this.ts.cursor];
 827
 828         }
 829
 830         // Parse function arguments.
 831         var argpos = 0;
 832         while (this.ts.lookTok().data != ')') { //(token = consumeToken()).getType() != Token.RP) {
 833             token = this.ts.nextTok();
 834            // print ("FUNC ARGS: " + token.toString())
 835             //assert token.getType() == Token.NAME ||
 836             //        token.getType() == Token.COMMA;
 837             if (token.type == 'NAME' && this.mode == 'BUILDING_SYMBOL_TREE') {
 838                 symbol = token.data;
 839                 identifier = fnScope.declareIdentifier(symbol,token);
 840                 if (symbol == "$super" && argpos == 0) {
 841                     // Exception for Prototype 1.6...
 842                     identifier.preventMunging();
 843                 }
 844                 argpos++;
 845             }
 846         }
 847
 848         token = this.ts.nextTok();
 849         print(token.toString());
 850         // assert token.getType() == Token.LC;
 851         this.braceNesting++;
 852
 853         token = this.ts.nextTok();
 854         print(token.toString());
 855         if (token.type == "STRN" && this.ts.lookTok(1).data == ';') {
 856             /*
 857
 858             NOT SUPPORTED YET!?!!?!
 859
 860             // This is a hint. Hints are empty statements that look like
 861             // "localvar1:nomunge, localvar2:nomunge"; They allow developers
 862             // to prevent specific symbols from getting obfuscated (some heretic
 863             // implementations, such as Prototype 1.6, require specific variable
 864             // names, such as $super for example, in order to work appropriately.
 865             // Note: right now, only "nomunge" is supported in the right hand side
 866             // of a hint. However, in the future, the right hand side may contain
 867             // other values.
 868             consumeToken();
 869             String hints = token.getValue();
 870             // Remove the leading and trailing quotes...
 871             hints = hints.substring(1, hints.length() - 1).trim();
 872             StringTokenizer st1 = new StringTokenizer(hints, ",");
 873             while (st1.hasMoreTokens()) {
 874                 String hint = st1.nextToken();
 875                 int idx = hint.indexOf(':');
 876                 if (idx <= 0 || idx >= hint.length() - 1) {
 877                     if (mode == BUILDING_SYMBOL_TREE) {
 878                         // No need to report the error twice, hence the test...
 879                         this.warn("Invalid hint syntax: " + hint, true);
 880                     }
 881                     break;
 882                 }
 883                 String variableName = hint.substring(0, idx).trim();
 884                 String variableType = hint.substring(idx + 1).trim();
 885                 if (mode == BUILDING_SYMBOL_TREE) {
 886                     fnScope.addHint(variableName, variableType);
 887                 } else if (mode == CHECKING_SYMBOL_TREE) {
 888                     identifier = fnScope.getIdentifier(variableName);
 889                     if (identifier != null) {
 890                         if (variableType.equals("nomunge")) {
 891                             identifier.preventMunging();
 892                         } else {
 893                             this.warn("Unsupported hint value: " + hint, true);
 894                         }
 895                     } else {
 896                         this.warn("Hint refers to an unknown identifier: " + hint, true);
 897                     }
 898                 }
 899             }
 900             */
 901         }
 902
 903         this.parseScope(fnScope);
 904         // now pop it off the stack!!!
 905
 906         this.braceNesting = b4braceNesting;
 907         print("ENDFN -1: " + this.ts.lookTok(-1).toString());
 908         print("ENDFN 0: " + this.ts.lookTok(0).toString());
 909         print("ENDFN 1: " + this.ts.lookTok(1).toString());
 910     },
 911
 912     protectScopeFromObfuscation : function(scope) {
 913             //assert scope != null;
 914
 915         if (scope == this.globalScope) {
 916             // The global scope does not get obfuscated,
 917             // so we don't need to worry about it...
 918             return;
 919         }
 920
 921         // Find the highest local scope containing the specified scope.
 922         while (scope && scope.parent != this.globalScope) {
 923             scope = scope.parent;
 924         }
 925
 926         //assert scope.getParentScope() == globalScope;
 927         scope.preventMunging();
 928     },
 929
 930     getIdentifier: function(symbol, scope) {
 931         var identifier;
 932         while (scope != false) {
 933             identifier = scope.getIdentifier(symbol);
 934             //println("ScopeParser.getIdentgetUsedSymbols("+symbol+")=" + scope.getUsedSymbols().join(','));
 935             if (identifier) {
 936                 return identifier;
 937             }
 938             scope = scope.parent;
 939         }
 940         return false;
 941     }
 942 };