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

   1 //<Script type="text/javascript">
   2
   3 Scope = imports.Scope.Scope;
   4 TokenStream = imports.TokenStream.TokenStream;
   5 /**
   6 * Scope stuff
   7 *
   8 * // FIXME - I need this to do next() without doccomments..
   9 *
  10 *
  11 *
  12 * Need to make this alot simpler...
  13 *
  14 * so debugging is possible.
  15 *
  16 *
  17 * at present it just runs along the stream and finds stuff then calls parseExpr .. etc,,
  18 *
  19 *
  20 * It would be better to parse blocks of code rather than the whole stream..
  21 *
  22 *
  23 *
  24 *
  25 *
  26 */
  27
  28 ScopeParser = function(ts) {
  29     this.ts = ts; // {TokenStream}
  30     this.warnings = [];
  31     this.scopes = [];
  32     this.indexedScopes = {};
  33     this.timer = new Date() * 1;
  34     this.debug = false;
  35 }
  36
  37 // list of keywords that should not be used in object literals.
  38 ScopeParser.idents = [
  39         "break",
  40         "case",
  41         "continue",
  42         "default",
  43         "delete",
  44         "do",
  45         "else",
  46         "export",
  47         "false",
  48         "for",
  49         "function",
  50         "if",
  51         "import",
  52         "in",
  53         "new",
  54         "null",
  55         "return",
  56         "switch",
  57         "this",
  58         "true",
  59         "typeof",
  60         "var",
  61         "void",
  62         "while",
  63         "with",
  64
  65         "catch",
  66         "class",
  67         "const",
  68         "debugger",
  69         "enum",
  70         "extends",
  71         "finally",
  72         "super",
  73         "throw",
  74         "try",
  75
  76         "abstract",
  77         "boolean",
  78         "byte",
  79         "char",
  80         "double",
  81         "final",
  82         "float",
  83         "goto",
  84         "implements",
  85         "instanceof",
  86         "int",
  87         "interface",
  88         "long",
  89         "native",
  90         "package",
  91         "private",
  92         "protected",
  93         "public",
  94         "short",
  95         "static",
  96         "synchronized",
  97         "throws",
  98         "transient",
  99                 "include",
 100                 "undefined"
 101 ];
 102
 103
 104 ScopeParser.prototype = {
 105     timer: 0,
 106     timerPrint: function (str) {
 107         var ntime = new Date() * 1;
 108         var tdif =  ntime -this.timer;
 109         this.timer = ntime;
 110         var pref = '';
 111         if (tdif > 100) { //slower ones..
 112             pref = '***';
 113         }
 114         println(pref+'['+tdif+']'+str);
 115
 116     },
 117     warn: function(s) {
 118         //print('****************' + s);
 119         this.warnings.push(s);
 120         //println("WARNING:" + htmlescape(s) + "<BR>");
 121     },
 122     // defaults should not be initialized here =- otherwise they get duped on new, rather than initalized..
 123     warnings : false,
 124     ts : false,
 125     scopes : false,
 126     global : false,
 127     mode : "", //"BUILDING_SYMBOL_TREE",
 128     braceNesting : 0,
 129     indexedScopes : false,
 130     munge: true,
 131
 132
 133
 134
 135
 136     buildSymbolTree : function()
 137     {
 138         //println("<PRE>");
 139
 140         this.ts.rewind();
 141         this.braceNesting = 0;
 142         this.scopes = [];
 143
 144
 145
 146
 147         this.globalScope = new  Scope(-1, false, -1, '');
 148         indexedScopes = { 0 : this.globalScope };
 149
 150         this.mode = 'BUILDING_SYMBOL_TREE';
 151         this.parseScope(this.globalScope);
 152
 153         //print("---------------END PASS 1 ---------------- ");
 154
 155     },
 156     mungeSymboltree : function()
 157     {
 158
 159         if (!this.munge) {
 160             return;
 161         }
 162
 163         // One problem with obfuscation resides in the use of undeclared
 164         // and un-namespaced global symbols that are 3 characters or less
 165         // in length. Here is an example:
 166         //
 167         //     var declaredGlobalVar;
 168         //
 169         //     function declaredGlobalFn() {
 170         //         var localvar;
 171         //         localvar = abc; // abc is an undeclared global symbol
 172         //     }
 173         //
 174         // In the example above, there is a slim chance that localvar may be
 175         // munged to 'abc', conflicting with the undeclared global symbol
 176         // abc, creating a potential bug. The following code detects such
 177         // global symbols. This must be done AFTER the entire file has been
 178         // parsed, and BEFORE munging the symbol tree. Note that declaring
 179         // extra symbols in the global scope won't hurt.
 180         //
 181         // Note: Since we go through all the tokens to do this, we also use
 182         // the opportunity to count how many times each identifier is used.
 183
 184         this.ts.rewind();
 185         this.braceNesting = 0;
 186         this.scopes= [];
 187         this.mode = 'PASS2_SYMBOL_TREE';
 188
 189         //println("MUNGING?");
 190
 191         this.parseScope(this.globalScope);
 192         this.globalScope.munge();
 193     },
 194
 195
 196     log : function(str)
 197     {
 198         print ("                    ".substring(0, this.braceNesting*2) + str);
 199
 200         //println("<B>LOG:</B>" + htmlescape(str) + "<BR/>\n");
 201     },
 202     logR : function(str)
 203     {
 204             //println("<B>LOG:</B>" + str + "<BR/>");
 205     },
 206
 207
 208
 209
 210
 211     parseScope : function(scope) // parse a token stream..
 212     {
 213         //this.timerPrint("parseScope EnterScope");
 214         //this.log(">>> ENTER SCOPE" + this.scopes.length);
 215         var symbol;
 216         var token;
 217
 218         var identifier;
 219
 220         var expressionBraceNesting = this.braceNesting + 0;
 221
 222         var parensNesting = 0;
 223
 224         var isObjectLitAr = [ false ];
 225         var isInObjectLitAr;
 226         this.scopes.push(scope);
 227
 228         //var scopeIndent = '';
 229         //this.scopes.forEach(function() {
 230         //    scopeIndent += '   ';
 231         //});
 232         print(">> ENTER SCOPE");
 233
 234
 235
 236
 237         token = this.ts.lookTok(1);
 238         while (token) {
 239           //  this.timerPrint("parseScope AFTER lookT: " + token.toString());
 240             //this.dumpToken(token , this.scopes, this.braceNesting);
 241             print('SCOPE:' + token.toString());
 242             //this.log(token.data);
 243             if (token.type == 'NAME') {
 244             //    print('*' + token.data);
 245             }
 246             switch(token.type + '.' + token.name) {
 247                 case "KEYW.VAR":
 248                 case "KEYW.CONST": // not really relivant as it's only mozzy that does this.
 249                     print('SCOPE-VAR:' + token.toString());
 250                     var vstart = this.ts.cursor +1;
 251
 252                     //this.log("parseScope GOT VAR/CONST : " + token.toString());
 253                     while (true) {
 254                         token = this.ts.nextTok();
 255                         //!this.debug|| print( token.toString());
 256                         print('SCOPE-VAR:' + token.toString());
 257                         if (!token) { // can return false at EOF!
 258                             break;
 259                         }
 260                         if (token.name == "VAR" || token.data == ',') { // kludge..
 261                             continue;
 262                         }
 263                         //this.logR("parseScope GOT VAR  : <B>" + token.toString() + "</B>");
 264                         if (token.type != "NAME") {
 265                             for(var i = Math.max(this.ts.cursor-10,0); i < this.ts.cursor+1; i++) {
 266                                 print(this.ts.tokens[i].toString());
 267                             }
 268
 269                             print( "var without ident");
 270                             Seed.quit()
 271                         }
 272
 273
 274                         if (this.mode == "BUILDING_SYMBOL_TREE") {
 275                             identifier = scope.getIdentifier(token.data) ;
 276
 277                             if (identifier == false) {
 278                                 scope.declareIdentifier(token.data, token);
 279                             } else {
 280                                 token.identifier = identifier;
 281                                 this.warn("(SCOPE) The variable " + token.data  + ' (line:' + token.line + ")  has already been declared in the same scope...");
 282                             }
 283                         }
 284
 285                         token = this.ts.nextTok();
 286                         !this.debug|| print(token.toString());
 287                         /*
 288                         assert token.getType() == Token.SEMI ||
 289                                 token.getType() == Token.ASSIGN ||
 290                                 token.getType() == Token.COMMA ||
 291                                 token.getType() == Token.IN;
 292                         */
 293                         if (token.name == "IN") {
 294                             break;
 295                         } else {
 296                             //var bn = this.braceNesting;
 297                             var bn = this.braceNesting;
 298                             this.parseExpression();
 299                             this.braceNesting = bn;
 300                             //this.braceNesting = bn;
 301                             //this.logR("parseScope DONE  : <B>ParseExpression</B> - tok is:" + this.ts.lookT(0).toString());
 302
 303                             token = this.ts.lookTok(1);
 304                             !this.debug|| print("AFTER EXP: " + token.toString());
 305                             if (token.data == ';') {
 306                                 break;
 307                             }
 308                         }
 309                     }
 310
 311                     //print("VAR:")
 312                     //this.ts.dump(vstart , this.ts.cursor);
 313
 314                     break;
 315                 case "KEYW.FUNCTION":
 316                     if (this.mode == 'BUILDING_SYMBOL_TREE')
 317                         print('SCOPE-FUNC:' + JSON.stringify(token,null,4));
 318                     //println("<i>"+token.data+"</i>");
 319                      var bn = this.braceNesting;
 320                     this.parseFunctionDeclaration();
 321                      this.braceNesting = bn;
 322                     break;
 323
 324                 case "PUNC.LEFT_CURLY": // {
 325                 case "PUNC.LEFT_PAREN": // (
 326                     print('SCOPE-CURLY/PAREN:' + token.toString());
 327                     //println("<i>"+token.data+"</i>");
 328                     var curTS = this.ts;
 329                     if (token.props) {
 330
 331                         for (var prop in token.props) {
 332                             if (token.props[prop].val.data == 'function') {
 333                                 // parse a function..
 334                                 this.parseFunctProp(token.props[prop]);
 335                                 continue;
 336                             }
 337                             // key value..
 338
 339                             this.ts = new TokenStream(token.props[prop].val);
 340                             this.parseScope(scope);
 341
 342                         }
 343                         this.ts = curTS;
 344
 345                         // it's an object literal..
 346                         // the values could be replaced..
 347                         break;
 348                     }
 349
 350
 351                     var _this = this;
 352                     token.items.forEach(function(expr) {
 353                           _this.ts = new TokenStream(expr);
 354                           _this.parseExpression(scope)
 355                     });
 356                     this.ts = curTS;
 357                     //print("NOT PROPS"); Seed.quit();
 358
 359                     //isObjectLitAr.push(false);
 360                     //this.braceNesting++;
 361
 362                     //print(">>>>>> OBJLIT PUSH(false)" + this.braceNesting);
 363                     break;
 364
 365                 case "PUNC.RIGHT_CURLY": // }
 366                     print("<< EXIT SCOPE");
 367                     return;
 368                 /*
 369                     //println("<i>"+token.data+"</i>");
 370                     this.braceNesting--;
 371                     isObjectLitAr.pop();
 372                     //print(">>>>>> OBJLIT POP"+ this.braceNesting);
 373                         //assert braceNesting >= scope.getBra ceNesting();
 374
 375                     if (this.braceNesting < expressionBraceNesting) {
 376                         var ls = this.scopes.pop();
 377                         ls.getUsedSymbols();
 378                         // eat symbol if we are currently at {
 379                         if (this.ts.look(0).data == '{') {
 380                             this.ts.nextTok();
 381                         }
 382
 383                         print("<<<<<<<EXIT SCOPE" +this.scopes.length);
 384                         return;
 385                     }
 386                     break;
 387 */
 388                 case "KEYW.WITH":
 389                     print('SCOPE-WITH:' + token.toString());
 390                     //println("<i>"+token.data+"</i>");
 391                     if (this.mode == "BUILDING_SYMBOL_TREE") {
 392                         // Inside a 'with' block, it is impossible to figure out
 393                         // statically whether a symbol is a local variable or an
 394                         // object member. As a consequence, the only thing we can
 395                         // do is turn the obfuscation off for the highest scope
 396                         // containing the 'with' block.
 397                         this.protectScopeFromObfuscation(scope);
 398                         this.warn("Using 'with' is not recommended." + (this.munge ? " Moreover, using 'with' reduces the level of compression!" : ""), true);
 399                     }
 400                     break;
 401
 402                 case "KEYW.CATCH":
 403                     print('SCOPE-CATCH:' + token.toString());
 404                     //println("<i>"+token.data+"</i>");
 405                     this.parseCatch();
 406                     break;
 407                 /*
 408                 case Token.SPECIALCOMMENT:
 409                         if (mode == BUILDING_SYMBOL_TREE) {
 410                             protectScopeFromObfuscation(scope);
 411                             this.warn("Using JScript conditional comments is not recommended." + (munge ? " Moreover, using JScript conditional comments reduces the level of compression." : ""), true);
 412                         }
 413                         break;
 414                 */
 415
 416                 case "STRN.DOUBLE_QUOTE": // used for object lit detection..
 417                 case "STRN.SINGLE_QUOTE":
 418                     print('SCOPE-STRING:' + token.toString());
 419                     //println("<i>"+token.data+"</i>");
 420
 421                     if (this.ts.lookTok(-1).data == '{' && this.ts.lookTok(1).data == ':') {
 422                         // then we are in an object lit.. -> we need to flag the brace as such...
 423                         isObjectLitAr.pop();
 424                         isObjectLitAr.push(true);
 425                         //print(">>>>>> OBJLIT REPUSH(true)");
 426                     }
 427                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 428
 429                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ':' &&
 430                         ( this.ts.lookTok(-1).data == '{'  ||  this.ts.lookTok(-1).data == ':' )) {
 431                         // see if we can replace..
 432                         // remove the quotes..
 433                         // should do a bit more checking!!!! (what about wierd char's in the string..
 434                         var str = token.data.substring(1,token.data.length-1);
 435                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 436                             token.outData = str;
 437                         }
 438
 439
 440
 441                     }
 442
 443
 444
 445                     break;
 446
 447                 case "NAME.NAME":
 448                     print('SCOPE-NAME:' + token.toString());
 449                     //print("DEAL WITH NAME:");
 450                     // got identifier..
 451
 452                     // look for  { ** : <- indicates obj literal.. ** this could occur with numbers ..
 453                     if ((this.ts.lookTok(-1).data == "{") && (this.ts.lookTok(1).data == ":")) {
 454                         isObjectLitAr.pop();
 455                         isObjectLitAr.push(true);
 456                         //print(">>>>>> OBJLIT REPUSH(true)");
 457                         //println("<i>"+token.data+"</i>");
 458                         break;
 459                     }
 460                    // print("DEAL WITH obj lit:");
 461                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 462
 463                     if (isInObjectLitAr && (this.ts.lookTok(1).data == ":") && (this.ts.lookTok(-1).data == ",")) {
 464                         // skip, it's an object lit key..
 465                         //println("<i>"+token.data+"</i>");
 466                         break;
 467                     }
 468
 469
 470                     // skip anyting with "." before it..!!
 471
 472                     if (this.ts.lookTok(-1).data == ".") {
 473                         // skip, it's an object prop.
 474                         //println("<i>"+token.data+"</i>");
 475                         break;
 476                     }
 477                     //print("SYMBOL: " + token.toString());
 478
 479                     symbol = token.data;
 480                     if (this.mode == 'PASS2_SYMBOL_TREE') {
 481
 482                         //println("GOT IDENT: -2 : " + this.ts.lookT(-2).toString() + " <BR> ..... -1 :  " +  this.ts.lookT(-1).toString() + " <BR> ");
 483
 484                         //print ("MUNGE?" + symbol);
 485
 486                         //println("GOT IDENT: <B>" + symbol + "</B><BR/>");
 487
 488                             //println("GOT IDENT (2): <B>" + symbol + "</B><BR/>");
 489                         identifier = this.getIdentifier(symbol, scope);
 490
 491                         if (identifier == false) {
 492 // BUG!find out where builtin is defined...
 493                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 494                                 // Here, we found an undeclared and un-namespaced symbol that is
 495                                 // 3 characters or less in length. Declare it in the global scope.
 496                                 // We don't need to declare longer symbols since they won't cause
 497                                 // any conflict with other munged symbols.
 498                                 this.globalScope.declareIdentifier(symbol, token);
 499                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 500                             }
 501
 502                             //println("GOT IDENT IGNORE(3): <B>" + symbol + "</B><BR/>");
 503                         } else {
 504                             token.identifier = identifier;
 505                             identifier.refcount++;
 506                         }
 507                     }
 508
 509                     break;
 510                     //println("<B>SID</B>");
 511                 default:
 512                     if (token.type != 'KEYW') {
 513                         break;
 514                     }
 515                     print('SCOPE-KEYW:' + token.toString());
 516                    // print("Check eval:");
 517
 518                     symbol = token.data;
 519
 520                      if (this.mode == 'BUILDING_SYMBOL_TREE') {
 521
 522                         if (symbol == "eval") {
 523                             // look back one and see if we can find a comment!!!
 524                             if (this.ts.look(-1).type == "COMM") {
 525                                 // look for eval:var:noreplace\n
 526                                 var _t = this;
 527                                 this.ts.look(-1).data.replace(/eval:var:([a-z_]+)/ig, function(m, a) {
 528
 529                                     var hi = _t.getIdentifier(a, scope);
 530                                    // println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 531                                     if (hi) {
 532                                      //   println("PROTECT "+a+" from munge");
 533                                         hi.toMunge = false;
 534                                     }
 535
 536                                 });
 537
 538
 539                             } else {
 540
 541
 542                                 this.protectScopeFromObfuscation(scope);
 543                                 this.warn("Using 'eval' is not recommended. (use  eval:var:noreplace in comments to optimize) " + (this.munge ? " Moreover, using 'eval' reduces the level of compression!" : ""), true);
 544                             }
 545
 546                         }
 547
 548                     }
 549                     break;
 550
 551
 552             } // end switch
 553
 554
 555             //print("parseScope TOK : " + token.toString());
 556             token = this.ts.nextTok();
 557             //if (this.ts.nextT()) break;
 558
 559         }
 560         print("<<< EXIT SCOPE");
 561         //print("<<<<<<<EXIT SCOPE ERR?" +this.scopes.length);
 562     },
 563
 564     expN : 0,
 565     parseExpression : function() {
 566
 567         // Parse the expression until we encounter a comma or a semi-colon
 568         // in the same brace nesting, bracket nesting and paren nesting.
 569         // Parse functions if any...
 570         //println("<i>EXP</i><BR/>");
 571         !this.debug || print("PARSE EXPR");
 572         this.expN++;
 573
 574         // for printing stuff..
 575
 576
 577
 578         var symbol;
 579         var token;
 580         var currentScope;
 581         var identifier;
 582
 583         var expressionBraceNesting = this.braceNesting + 0;
 584         var bracketNesting = 0;
 585         var parensNesting = 0;
 586         var isInObjectLitAr;
 587         var isObjectLitAr = [ false ];
 588
 589         currentScope = this.scopes[this.scopes.length-1];
 590
 591
 592         //print(scopeIndent + ">> ENTER EXPRESSION" + this.expN);
 593         while (token = this.ts.nextTok()) {
 594
 595
 596
 597            /*
 598             // moved out of loop?
 599            currentScope = this.scopes[this.scopes.length-1];
 600
 601             var scopeIndent = '';
 602             this.scopes.forEach(function() {
 603                 scopeIndent += '   ';
 604             });
 605            */
 606
 607            //this.dumpToken(token,  this.scopes, this.braceNesting );
 608            print('EXP' +  token.toString());
 609
 610
 611             //println("<i>"+token.data+"</i>");
 612             //this.log("EXP:" + token.data);
 613             switch (token.type) {
 614                 case 'PUNC':
 615                     print("EXPR-PUNC:" + token.toString());
 616
 617                     switch(token.data) {
 618
 619                         case ';':
 620                             print("<< EXIT EXPRESSION");
 621                             break;
 622
 623                         case ',':
 624
 625                             break;
 626
 627
 628                         case '(': //Token.LP:
 629                         case '{': //Token.LC:
 630                         case '[': //Token.LB:
 631                             print('SCOPE-CURLY/PAREN/BRACE:' + token.toString());
 632                             //println("<i>"+token.data+"</i>");
 633                             var curTS = this.ts;
 634                             if (token.props) {
 635
 636                                 for (var prop in token.props) {
 637                                     if (token.props[prop].val.data == 'function') {
 638                                         // parse a function..
 639                                         this.parseFunctProp(token.props[prop]);
 640                                         continue;
 641                                     }
 642                                     // key value..
 643
 644                                     this.ts = new TokenStream(token.props[prop].val);
 645                                     this.parseScope(currentScope);
 646
 647                                 }
 648                                 this.ts = curTS;
 649
 650                                 // it's an object literal..
 651                                 // the values could be replaced..
 652                                 break;
 653                             }
 654
 655
 656                             var _this = this;
 657                             token.items.forEach(function(expr) {
 658                                   _this.ts = new TokenStream(expr);
 659                                   _this.parseExpression()
 660                             });
 661                             this.ts = curTS;
 662
 663
 664
 665                             ///print(">>>>> EXP PUSH(false)"+this.braceNesting);
 666                             break;
 667
 668
 669
 670
 671
 672                         case ')': //Token.RP:
 673                         case ']': //Token.RB:
 674                         case '}': //Token.RB:
 675                             print("<< EXIT EXPRESSION");
 676                             return;
 677
 678
 679
 680                             parensNesting++;
 681                             break;
 682
 683
 684
 685                     }
 686                     break;
 687
 688                 case 'STRN': // used for object lit detection..
 689                     if (this.mode == 'BUILDING_SYMBOL_TREE')
 690                         print("EXPR-STR:" + JSON.stringify(token, null, 4));
 691                     if (this.ts.lookTok(-1).data == "{" && this.ts.lookTok(1).data == ":" ) {
 692                         // then we are in an object lit.. -> we need to flag the brace as such...
 693                         isObjectLitAr.pop();
 694                         isObjectLitAr.push(true);
 695                         //print(">>>>> EXP PUSH(true)");
 696                     }
 697
 698
 699
 700                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 701                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ":"  &&
 702                         ( this.ts.lookTok(-1).data == "{"  ||  this.ts.lookTok(-1).data == "," )) {
 703                         // see if we can replace..
 704                         // remove the quotes..
 705                         var str = token.data.substring(1,token.data.length-1);
 706                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 707                             token.outData = str;
 708                         }
 709
 710
 711
 712                     }
 713
 714                     break;
 715
 716
 717
 718                 case 'NAME':
 719                     if (this.mode == 'BUILDING_SYMBOL_TREE')
 720                         print("EXPR-NAME:" + JSON.stringify(token, null, 4));
 721                     symbol = token.data;
 722                     //print("in NAME = " + token.toString());
 723                     //print("in NAME 0: " + this.ts.look(0).toString());
 724                     //print("in NAME 2: " + this.ts.lookTok(2).toString());
 725                     if (this.ts.look(0).data == "{"  && this.ts.lookTok(2).data == ":") {
 726                         // then we are in an object lit.. -> we need to flag the brace as such...
 727                         isObjectLitAr.pop();
 728                         isObjectLitAr.push(true);
 729                          //print(">>>>> EXP  PUSH(true)");
 730                         break;
 731                     }
 732
 733                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 734                     //print ("isInObjectLitAr : " + isInObjectLitAr + ' ' + token.toString());
 735
 736                     if (isInObjectLitAr && this.ts.lookTok(0).data == "," && this.ts.lookTok(2).data == ":") {
 737                         break;
 738                     }
 739                     //print(this.ts.lookTok(0).data);
 740                     if (this.ts.lookTok(0).data == ".") {
 741                         //skip '.'
 742                         break;
 743                     }
 744
 745                      if (this.mode == 'PASS2_SYMBOL_TREE') {
 746
 747                         identifier = this.getIdentifier(symbol, currentScope);
 748                         //println("<B>??</B>");
 749                         if (identifier == false) {
 750
 751                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 752                                 // Here, we found an undeclared and un-namespaced symbol that is
 753                                 // 3 characters or less in length. Declare it in the global scope.
 754                                 // We don't need to declare longer symbols since they won't cause
 755                                 // any conflict with other munged symbols.
 756                                 this.globalScope.declareIdentifier(symbol, token);
 757                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 758                             } else {
 759                                 //println("undeclared")
 760                             }
 761
 762
 763                         } else {
 764                             //println("<B>++</B>");
 765                             token.identifier = identifier;
 766                             identifier.refcount++;
 767                         }
 768
 769                     }
 770                     break;
 771
 772
 773
 774
 775                     //println("<B>EID</B>");
 776                 case 'KEYW':
 777                     if (this.mode == 'BUILDING_SYMBOL_TREE')
 778                         print("EXPR-KEYW:" + JSON.stringify(token, null, 4));
 779                     if (token.name == "FUNCTION") {
 780
 781                         this.parseFunctionDeclaration();
 782                         break;
 783                     }
 784
 785
 786
 787                     symbol = token.data;
 788                     if (this.mode == 'BUILDING_SYMBOL_TREE') {
 789
 790                         if (symbol == "eval") {
 791                             if (this.ts.look(-1).type == 'COMM') {
 792                                 // look for eval:var:noreplace\n
 793                                 var _t = this;
 794                                 this.ts.look(-1).data.replace(/eval:var:([a-z]+)/ig, function(m, a) {
 795                                     var hi = _t.getIdentifier(a, currentScope);
 796                                    //println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 797                                     if (hi) {
 798                                       //  println("PROTECT "+a+" from munge");
 799                                         hi.toMunge = false;
 800                                     }
 801
 802
 803                                 });
 804
 805                             } else {
 806                                 this.protectScopeFromObfuscation(currentScope);
 807                                 this.warn("Using 'eval' is not recommended." + (this.munge ? " Moreover, using 'eval' reduces the level of compression!" : ""), true);
 808                             }
 809
 810
 811                         }
 812                         break;
 813                     }
 814                 default:
 815                     if (this.mode == 'BUILDING_SYMBOL_TREE')
 816                         print("EXPR-SKIP:" + JSON.stringify(token, null, 4));
 817                     break;
 818             }
 819
 820         }
 821         print("<< EXIT EXPRESSION");
 822         this.expN--;
 823     },
 824
 825
 826     parseCatch : function() {
 827
 828         var symbol;
 829         var token;
 830         var currentScope;
 831         var identifier;
 832
 833         //token = getToken(-1);
 834         //assert token.getType() == Token.CATCH;
 835         token = this.ts.nextTok();
 836         //assert token.getType() == Token.LP; (
 837         token = this.ts.nextTok();
 838         //assert token.getType() == Token.NAME;
 839
 840         symbol = token.data;
 841         currentScope = this.scopes[this.scopes.length-1];
 842
 843         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 844             // We must declare the exception identifier in the containing function
 845             // scope to avoid errors related to the obfuscation process. No need to
 846             // display a warning if the symbol was already declared here...
 847             currentScope.declareIdentifier(symbol, token);
 848         } else {
 849             //?? why inc the refcount?? - that should be set when building the tree???
 850             identifier = this.getIdentifier(symbol, currentScope);
 851             identifier.refcount++;
 852         }
 853
 854         token = this.ts.nextTok();
 855         //assert token.getType() == Token.RP; // )
 856     },
 857
 858     parseFunctionDeclaration : function()
 859     {
 860         //print("PARSE FUNCTION");
 861         var symbol;
 862         var token;
 863         var currentScope  = false;
 864         var fnScope = false;
 865         var identifier;
 866         var b4braceNesting = this.braceNesting + 0;
 867
 868         //this.logR("<B>PARSING FUNCTION</B>");
 869         currentScope = this.scopes[this.scopes.length-1];
 870
 871         token = this.ts.nextTok();
 872         if (token.type == "NAME") {
 873             if (this.mode == 'BUILDING_SYMBOL_TREE') {
 874                 // Get the name of the function and declare it in the current scope.
 875                 symbol = token.data;
 876                 if (currentScope.getIdentifier(symbol) != false) {
 877                     this.warn("The function " + symbol + " has already been declared in the same scope...", true);
 878                 }
 879                 currentScope.declareIdentifier(symbol,token);
 880             }
 881             token =  this.ts.nextTok();
 882         }
 883
 884         //assert token.getType() == Token.LP;
 885         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 886             fnScope = new Scope(this.braceNesting, currentScope, token.n, '');
 887
 888             //println("STORING SCOPE" + this.ts.cursor);
 889
 890             this.indexedScopes[this.ts.cursor] = fnScope;
 891
 892         } else {
 893             //qln("FETCHING SCOPE" + this.ts.cursor);
 894             fnScope = this.indexedScopes[this.ts.cursor];
 895
 896         }
 897         if (this.mode == 'BUILDING_SYMBOL_TREE')
 898             print('FUNC-PARSE:' + JSON.stringify(token,null,4));
 899         // Parse function arguments.
 900         var args = token.items;
 901         for (var argpos =0; argpos < args.length; argpos++) {
 902
 903             token = args[argpos][0];
 904            // print ("FUNC ARGS: " + token.toString())
 905             //assert token.getType() == Token.NAME ||
 906             //        token.getType() == Token.COMMA;
 907             if (token.type == 'NAME' && this.mode == 'BUILDING_SYMBOL_TREE') {
 908                 symbol = token.data;
 909                 identifier = fnScope.declareIdentifier(symbol,token);
 910                 if (symbol == "$super" && argpos == 0) {
 911                     // Exception for Prototype 1.6...
 912                     identifier.preventMunging();
 913                 }
 914                 argpos++;
 915             }
 916         }
 917
 918         token = this.ts.nextTok();
 919         //print('FUNC-BODY:' + JSON.stringify(token.items,null,4));
 920         //Seed.quit();
 921         //print(token.toString());
 922         // assert token.getType() == Token.LC;
 923         //this.braceNesting++;
 924
 925         //token = this.ts.nextTok();
 926         //print(token.toString());
 927         var outTS = this.ts;
 928         var _this = this;
 929         token.items.forEach(function(tar) {
 930             _this.ts = new TokenStream(tar);
 931             _this.parseScope(fnScope);
 932
 933         });
 934
 935         //print(JSON.stringify(this.ts,null,4));
 936         //this.parseScope(fnScope);
 937         this.ts = outTS;
 938         // now pop it off the stack!!!
 939
 940         //this.braceNesting = b4braceNesting;
 941         //print("ENDFN -1: " + this.ts.lookTok(-1).toString());
 942         //print("ENDFN 0: " + this.ts.lookTok(0).toString());
 943         //print("ENDFN 1: " + this.ts.lookTok(1).toString());
 944     },
 945
 946     protectScopeFromObfuscation : function(scope) {
 947             //assert scope != null;
 948
 949         if (scope == this.globalScope) {
 950             // The global scope does not get obfuscated,
 951             // so we don't need to worry about it...
 952             return;
 953         }
 954
 955         // Find the highest local scope containing the specified scope.
 956         while (scope && scope.parent != this.globalScope) {
 957             scope = scope.parent;
 958         }
 959
 960         //assert scope.getParentScope() == globalScope;
 961         scope.preventMunging();
 962     },
 963
 964     getIdentifier: function(symbol, scope) {
 965         var identifier;
 966         while (scope != false) {
 967             identifier = scope.getIdentifier(symbol);
 968             //println("ScopeParser.getIdentgetUsedSymbols("+symbol+")=" + scope.getUsedSymbols().join(','));
 969             if (identifier) {
 970                 return identifier;
 971             }
 972             scope = scope.parent;
 973         }
 974         return false;
 975     }
 976 };