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
 333                             // print('SCOPE-PROPS:' + JSON.stringify(token.props[prop],null,4));
 334                             if (token.props[prop].val[0].data == 'function') {
 335                                 // parse a function..
 336                                 this.ts = new TokenStream(token.props[prop].val);
 337                                 this.parseFunctionDeclaration();
 338
 339                                 continue;
 340                             }
 341                             // key value..
 342
 343                             this.ts = new TokenStream(token.props[prop].val);
 344                             this.parseScope(scope);
 345
 346                         }
 347                         this.ts = curTS;
 348
 349                         // it's an object literal..
 350                         // the values could be replaced..
 351                         break;
 352                     }
 353
 354
 355                     var _this = this;
 356                     token.items.forEach(function(expr) {
 357                           _this.ts = new TokenStream(expr);
 358                           _this.parseExpression(scope)
 359                     });
 360                     this.ts = curTS;
 361                     //print("NOT PROPS"); Seed.quit();
 362
 363                     //isObjectLitAr.push(false);
 364                     //this.braceNesting++;
 365
 366                     //print(">>>>>> OBJLIT PUSH(false)" + this.braceNesting);
 367                     break;
 368
 369                 case "PUNC.RIGHT_CURLY": // }
 370                     print("<< EXIT SCOPE");
 371                     return;
 372                 /*
 373                     //println("<i>"+token.data+"</i>");
 374                     this.braceNesting--;
 375                     isObjectLitAr.pop();
 376                     //print(">>>>>> OBJLIT POP"+ this.braceNesting);
 377                         //assert braceNesting >= scope.getBra ceNesting();
 378
 379                     if (this.braceNesting < expressionBraceNesting) {
 380                         var ls = this.scopes.pop();
 381                         ls.getUsedSymbols();
 382                         // eat symbol if we are currently at {
 383                         if (this.ts.look(0).data == '{') {
 384                             this.ts.nextTok();
 385                         }
 386
 387                         print("<<<<<<<EXIT SCOPE" +this.scopes.length);
 388                         return;
 389                     }
 390                     break;
 391 */
 392                 case "KEYW.WITH":
 393                     print('SCOPE-WITH:' + token.toString());
 394                     //println("<i>"+token.data+"</i>");
 395                     if (this.mode == "BUILDING_SYMBOL_TREE") {
 396                         // Inside a 'with' block, it is impossible to figure out
 397                         // statically whether a symbol is a local variable or an
 398                         // object member. As a consequence, the only thing we can
 399                         // do is turn the obfuscation off for the highest scope
 400                         // containing the 'with' block.
 401                         this.protectScopeFromObfuscation(scope);
 402                         this.warn("Using 'with' is not recommended." + (this.munge ? " Moreover, using 'with' reduces the level of compression!" : ""), true);
 403                     }
 404                     break;
 405
 406                 case "KEYW.CATCH":
 407                     print('SCOPE-CATCH:' + token.toString());
 408                     //println("<i>"+token.data+"</i>");
 409                     this.parseCatch();
 410                     break;
 411                 /*
 412                 case Token.SPECIALCOMMENT:
 413                         if (mode == BUILDING_SYMBOL_TREE) {
 414                             protectScopeFromObfuscation(scope);
 415                             this.warn("Using JScript conditional comments is not recommended." + (munge ? " Moreover, using JScript conditional comments reduces the level of compression." : ""), true);
 416                         }
 417                         break;
 418                 */
 419
 420                 case "STRN.DOUBLE_QUOTE": // used for object lit detection..
 421                 case "STRN.SINGLE_QUOTE":
 422                     print('SCOPE-STRING:' + token.toString());
 423                     //println("<i>"+token.data+"</i>");
 424
 425                     if (this.ts.lookTok(-1).data == '{' && this.ts.lookTok(1).data == ':') {
 426                         // then we are in an object lit.. -> we need to flag the brace as such...
 427                         isObjectLitAr.pop();
 428                         isObjectLitAr.push(true);
 429                         //print(">>>>>> OBJLIT REPUSH(true)");
 430                     }
 431                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 432
 433                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ':' &&
 434                         ( this.ts.lookTok(-1).data == '{'  ||  this.ts.lookTok(-1).data == ':' )) {
 435                         // see if we can replace..
 436                         // remove the quotes..
 437                         // should do a bit more checking!!!! (what about wierd char's in the string..
 438                         var str = token.data.substring(1,token.data.length-1);
 439                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 440                             token.outData = str;
 441                         }
 442
 443
 444
 445                     }
 446
 447
 448
 449                     break;
 450
 451                 case "NAME.NAME":
 452                     print('SCOPE-NAME:' + token.toString());
 453                     //print("DEAL WITH NAME:");
 454                     // got identifier..
 455
 456                     // look for  { ** : <- indicates obj literal.. ** this could occur with numbers ..
 457                     if ((this.ts.lookTok(-1).data == "{") && (this.ts.lookTok(1).data == ":")) {
 458                         isObjectLitAr.pop();
 459                         isObjectLitAr.push(true);
 460                         //print(">>>>>> OBJLIT REPUSH(true)");
 461                         //println("<i>"+token.data+"</i>");
 462                         break;
 463                     }
 464                    // print("DEAL WITH obj lit:");
 465                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 466
 467                     if (isInObjectLitAr && (this.ts.lookTok(1).data == ":") && (this.ts.lookTok(-1).data == ",")) {
 468                         // skip, it's an object lit key..
 469                         //println("<i>"+token.data+"</i>");
 470                         break;
 471                     }
 472
 473
 474                     // skip anyting with "." before it..!!
 475
 476                     if (this.ts.lookTok(-1).data == ".") {
 477                         // skip, it's an object prop.
 478                         //println("<i>"+token.data+"</i>");
 479                         break;
 480                     }
 481                     //print("SYMBOL: " + token.toString());
 482
 483                     symbol = token.data;
 484                     if (this.mode == 'PASS2_SYMBOL_TREE') {
 485
 486                         //println("GOT IDENT: -2 : " + this.ts.lookT(-2).toString() + " <BR> ..... -1 :  " +  this.ts.lookT(-1).toString() + " <BR> ");
 487
 488                         //print ("MUNGE?" + symbol);
 489
 490                         //println("GOT IDENT: <B>" + symbol + "</B><BR/>");
 491
 492                             //println("GOT IDENT (2): <B>" + symbol + "</B><BR/>");
 493                         identifier = this.getIdentifier(symbol, scope);
 494
 495                         if (identifier == false) {
 496 // BUG!find out where builtin is defined...
 497                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 498                                 // Here, we found an undeclared and un-namespaced symbol that is
 499                                 // 3 characters or less in length. Declare it in the global scope.
 500                                 // We don't need to declare longer symbols since they won't cause
 501                                 // any conflict with other munged symbols.
 502                                 this.globalScope.declareIdentifier(symbol, token);
 503                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 504                             }
 505
 506                             //println("GOT IDENT IGNORE(3): <B>" + symbol + "</B><BR/>");
 507                         } else {
 508                             token.identifier = identifier;
 509                             identifier.refcount++;
 510                         }
 511                     }
 512
 513                     break;
 514                     //println("<B>SID</B>");
 515                 default:
 516                     if (token.type != 'KEYW') {
 517                         break;
 518                     }
 519                     print('SCOPE-KEYW:' + token.toString());
 520                    // print("Check eval:");
 521
 522                     symbol = token.data;
 523
 524                      if (this.mode == 'BUILDING_SYMBOL_TREE') {
 525
 526                         if (symbol == "eval") {
 527                             // look back one and see if we can find a comment!!!
 528                             if (this.ts.look(-1).type == "COMM") {
 529                                 // look for eval:var:noreplace\n
 530                                 var _t = this;
 531                                 this.ts.look(-1).data.replace(/eval:var:([a-z_]+)/ig, function(m, a) {
 532
 533                                     var hi = _t.getIdentifier(a, scope);
 534                                    // println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 535                                     if (hi) {
 536                                      //   println("PROTECT "+a+" from munge");
 537                                         hi.toMunge = false;
 538                                     }
 539
 540                                 });
 541
 542
 543                             } else {
 544
 545
 546                                 this.protectScopeFromObfuscation(scope);
 547                                 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);
 548                             }
 549
 550                         }
 551
 552                     }
 553                     break;
 554
 555
 556             } // end switch
 557
 558
 559             //print("parseScope TOK : " + token.toString());
 560             token = this.ts.nextTok();
 561             //if (this.ts.nextT()) break;
 562
 563         }
 564         print("<<< EXIT SCOPE");
 565         //print("<<<<<<<EXIT SCOPE ERR?" +this.scopes.length);
 566     },
 567
 568     expN : 0,
 569     parseExpression : function() {
 570
 571         // Parse the expression until we encounter a comma or a semi-colon
 572         // in the same brace nesting, bracket nesting and paren nesting.
 573         // Parse functions if any...
 574         //println("<i>EXP</i><BR/>");
 575         !this.debug || print("PARSE EXPR");
 576         this.expN++;
 577
 578         // for printing stuff..
 579
 580
 581
 582         var symbol;
 583         var token;
 584         var currentScope;
 585         var identifier;
 586
 587         var expressionBraceNesting = this.braceNesting + 0;
 588         var bracketNesting = 0;
 589         var parensNesting = 0;
 590         var isInObjectLitAr;
 591         var isObjectLitAr = [ false ];
 592
 593         currentScope = this.scopes[this.scopes.length-1];
 594
 595
 596         //print(scopeIndent + ">> ENTER EXPRESSION" + this.expN);
 597         while (token = this.ts.nextTok()) {
 598
 599
 600
 601            /*
 602             // moved out of loop?
 603            currentScope = this.scopes[this.scopes.length-1];
 604
 605             var scopeIndent = '';
 606             this.scopes.forEach(function() {
 607                 scopeIndent += '   ';
 608             });
 609            */
 610
 611            //this.dumpToken(token,  this.scopes, this.braceNesting );
 612            print('EXP' +  token.toString());
 613
 614
 615             //println("<i>"+token.data+"</i>");
 616             //this.log("EXP:" + token.data);
 617             switch (token.type) {
 618                 case 'PUNC':
 619                     print("EXPR-PUNC:" + token.toString());
 620
 621                     switch(token.data) {
 622
 623                         case ';':
 624                             print("<< EXIT EXPRESSION");
 625                             break;
 626
 627                         case ',':
 628
 629                             break;
 630
 631
 632                         case '(': //Token.LP:
 633                         case '{': //Token.LC:
 634                         case '[': //Token.LB:
 635                             print('SCOPE-CURLY/PAREN/BRACE:' + token.toString());
 636                             //println("<i>"+token.data+"</i>");
 637                             var curTS = this.ts;
 638                             if (token.props) {
 639
 640                                 for (var prop in token.props) {
 641                                     if (token.props[prop].val.data == 'function') {
 642                                         // parse a function..
 643                                         this.parseFunctProp(token.props[prop]);
 644                                         continue;
 645                                     }
 646                                     // key value..
 647
 648                                     this.ts = new TokenStream(token.props[prop].val);
 649                                     this.parseScope(currentScope);
 650
 651                                 }
 652                                 this.ts = curTS;
 653
 654                                 // it's an object literal..
 655                                 // the values could be replaced..
 656                                 break;
 657                             }
 658
 659
 660                             var _this = this;
 661                             token.items.forEach(function(expr) {
 662                                   _this.ts = new TokenStream(expr);
 663                                   _this.parseExpression()
 664                             });
 665                             this.ts = curTS;
 666
 667
 668
 669                             ///print(">>>>> EXP PUSH(false)"+this.braceNesting);
 670                             break;
 671
 672
 673
 674
 675
 676                         case ')': //Token.RP:
 677                         case ']': //Token.RB:
 678                         case '}': //Token.RB:
 679                             print("<< EXIT EXPRESSION");
 680                             return;
 681
 682
 683
 684                             parensNesting++;
 685                             break;
 686
 687
 688
 689                     }
 690                     break;
 691
 692                 case 'STRN': // used for object lit detection..
 693                     if (this.mode == 'BUILDING_SYMBOL_TREE')
 694                         print("EXPR-STR:" + JSON.stringify(token, null, 4));
 695                     if (this.ts.lookTok(-1).data == "{" && this.ts.lookTok(1).data == ":" ) {
 696                         // then we are in an object lit.. -> we need to flag the brace as such...
 697                         isObjectLitAr.pop();
 698                         isObjectLitAr.push(true);
 699                         //print(">>>>> EXP PUSH(true)");
 700                     }
 701
 702
 703
 704                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 705                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ":"  &&
 706                         ( this.ts.lookTok(-1).data == "{"  ||  this.ts.lookTok(-1).data == "," )) {
 707                         // see if we can replace..
 708                         // remove the quotes..
 709                         var str = token.data.substring(1,token.data.length-1);
 710                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 711                             token.outData = str;
 712                         }
 713
 714
 715
 716                     }
 717
 718                     break;
 719
 720
 721
 722                 case 'NAME':
 723                     if (this.mode == 'BUILDING_SYMBOL_TREE')
 724                         print("EXPR-NAME:" + JSON.stringify(token, null, 4));
 725                     symbol = token.data;
 726                     //print("in NAME = " + token.toString());
 727                     //print("in NAME 0: " + this.ts.look(0).toString());
 728                     //print("in NAME 2: " + this.ts.lookTok(2).toString());
 729                     if (this.ts.look(0).data == "{"  && this.ts.lookTok(2).data == ":") {
 730                         // then we are in an object lit.. -> we need to flag the brace as such...
 731                         isObjectLitAr.pop();
 732                         isObjectLitAr.push(true);
 733                          //print(">>>>> EXP  PUSH(true)");
 734                         break;
 735                     }
 736
 737                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 738                     //print ("isInObjectLitAr : " + isInObjectLitAr + ' ' + token.toString());
 739
 740                     if (isInObjectLitAr && this.ts.lookTok(0).data == "," && this.ts.lookTok(2).data == ":") {
 741                         break;
 742                     }
 743                     //print(this.ts.lookTok(0).data);
 744                     if (this.ts.lookTok(0).data == ".") {
 745                         //skip '.'
 746                         break;
 747                     }
 748
 749                      if (this.mode == 'PASS2_SYMBOL_TREE') {
 750
 751                         identifier = this.getIdentifier(symbol, currentScope);
 752                         //println("<B>??</B>");
 753                         if (identifier == false) {
 754
 755                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 756                                 // Here, we found an undeclared and un-namespaced symbol that is
 757                                 // 3 characters or less in length. Declare it in the global scope.
 758                                 // We don't need to declare longer symbols since they won't cause
 759                                 // any conflict with other munged symbols.
 760                                 this.globalScope.declareIdentifier(symbol, token);
 761                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 762                             } else {
 763                                 //println("undeclared")
 764                             }
 765
 766
 767                         } else {
 768                             //println("<B>++</B>");
 769                             token.identifier = identifier;
 770                             identifier.refcount++;
 771                         }
 772
 773                     }
 774                     break;
 775
 776
 777
 778
 779                     //println("<B>EID</B>");
 780                 case 'KEYW':
 781                     if (this.mode == 'BUILDING_SYMBOL_TREE')
 782                         print("EXPR-KEYW:" + JSON.stringify(token, null, 4));
 783                     if (token.name == "FUNCTION") {
 784
 785                         this.parseFunctionDeclaration();
 786                         break;
 787                     }
 788
 789
 790
 791                     symbol = token.data;
 792                     if (this.mode == 'BUILDING_SYMBOL_TREE') {
 793
 794                         if (symbol == "eval") {
 795                             if (this.ts.look(-1).type == 'COMM') {
 796                                 // look for eval:var:noreplace\n
 797                                 var _t = this;
 798                                 this.ts.look(-1).data.replace(/eval:var:([a-z]+)/ig, function(m, a) {
 799                                     var hi = _t.getIdentifier(a, currentScope);
 800                                    //println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 801                                     if (hi) {
 802                                       //  println("PROTECT "+a+" from munge");
 803                                         hi.toMunge = false;
 804                                     }
 805
 806
 807                                 });
 808
 809                             } else {
 810                                 this.protectScopeFromObfuscation(currentScope);
 811                                 this.warn("Using 'eval' is not recommended." + (this.munge ? " Moreover, using 'eval' reduces the level of compression!" : ""), true);
 812                             }
 813
 814
 815                         }
 816                         break;
 817                     }
 818                 default:
 819                     if (this.mode == 'BUILDING_SYMBOL_TREE')
 820                         print("EXPR-SKIP:" + JSON.stringify(token, null, 4));
 821                     break;
 822             }
 823
 824         }
 825         print("<< EXIT EXPRESSION");
 826         this.expN--;
 827     },
 828
 829
 830     parseCatch : function() {
 831
 832         var symbol;
 833         var token;
 834         var currentScope;
 835         var identifier;
 836
 837         //token = getToken(-1);
 838         //assert token.getType() == Token.CATCH;
 839         token = this.ts.nextTok();
 840         //assert token.getType() == Token.LP; (
 841         token = this.ts.nextTok();
 842         //assert token.getType() == Token.NAME;
 843
 844         symbol = token.data;
 845         currentScope = this.scopes[this.scopes.length-1];
 846
 847         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 848             // We must declare the exception identifier in the containing function
 849             // scope to avoid errors related to the obfuscation process. No need to
 850             // display a warning if the symbol was already declared here...
 851             currentScope.declareIdentifier(symbol, token);
 852         } else {
 853             //?? why inc the refcount?? - that should be set when building the tree???
 854             identifier = this.getIdentifier(symbol, currentScope);
 855             identifier.refcount++;
 856         }
 857
 858         token = this.ts.nextTok();
 859         //assert token.getType() == Token.RP; // )
 860     },
 861
 862     parseFunctionDeclaration : function()
 863     {
 864         //print("PARSE FUNCTION");
 865         var symbol;
 866         var token;
 867         var currentScope  = false;
 868         var fnScope = false;
 869         var identifier;
 870         var b4braceNesting = this.braceNesting + 0;
 871
 872         //this.logR("<B>PARSING FUNCTION</B>");
 873         currentScope = this.scopes[this.scopes.length-1];
 874
 875         token = this.ts.nextTok();
 876         if (token.type == "NAME") {
 877             if (this.mode == 'BUILDING_SYMBOL_TREE') {
 878                 // Get the name of the function and declare it in the current scope.
 879                 symbol = token.data;
 880                 if (currentScope.getIdentifier(symbol) != false) {
 881                     this.warn("The function " + symbol + " has already been declared in the same scope...", true);
 882                 }
 883                 currentScope.declareIdentifier(symbol,token);
 884             }
 885             token =  this.ts.nextTok();
 886         }
 887
 888         //assert token.getType() == Token.LP;
 889         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 890             fnScope = new Scope(this.braceNesting, currentScope, token.n, '');
 891
 892             //println("STORING SCOPE" + this.ts.cursor);
 893
 894             this.indexedScopes[this.ts.cursor] = fnScope;
 895
 896         } else {
 897             //qln("FETCHING SCOPE" + this.ts.cursor);
 898             fnScope = this.indexedScopes[this.ts.cursor];
 899
 900         }
 901         if (this.mode == 'BUILDING_SYMBOL_TREE')
 902             print('FUNC-PARSE:' + JSON.stringify(token,null,4));
 903         // Parse function arguments.
 904         var args = token.items;
 905         for (var argpos =0; argpos < args.length; argpos++) {
 906
 907             token = args[argpos][0];
 908            // print ("FUNC ARGS: " + token.toString())
 909             //assert token.getType() == Token.NAME ||
 910             //        token.getType() == Token.COMMA;
 911             if (token.type == 'NAME' && this.mode == 'BUILDING_SYMBOL_TREE') {
 912                 symbol = token.data;
 913                 identifier = fnScope.declareIdentifier(symbol,token);
 914                 if (symbol == "$super" && argpos == 0) {
 915                     // Exception for Prototype 1.6...
 916                     identifier.preventMunging();
 917                 }
 918                 argpos++;
 919             }
 920         }
 921
 922         token = this.ts.nextTok();
 923         //print('FUNC-BODY:' + JSON.stringify(token.items,null,4));
 924         //Seed.quit();
 925         //print(token.toString());
 926         // assert token.getType() == Token.LC;
 927         //this.braceNesting++;
 928
 929         //token = this.ts.nextTok();
 930         //print(token.toString());
 931         var outTS = this.ts;
 932         var _this = this;
 933         token.items.forEach(function(tar) {
 934             _this.ts = new TokenStream(tar);
 935             _this.parseScope(fnScope);
 936
 937         });
 938
 939         //print(JSON.stringify(this.ts,null,4));
 940         //this.parseScope(fnScope);
 941         this.ts = outTS;
 942         // now pop it off the stack!!!
 943
 944         //this.braceNesting = b4braceNesting;
 945         //print("ENDFN -1: " + this.ts.lookTok(-1).toString());
 946         //print("ENDFN 0: " + this.ts.lookTok(0).toString());
 947         //print("ENDFN 1: " + this.ts.lookTok(1).toString());
 948     },
 949
 950     protectScopeFromObfuscation : function(scope) {
 951             //assert scope != null;
 952
 953         if (scope == this.globalScope) {
 954             // The global scope does not get obfuscated,
 955             // so we don't need to worry about it...
 956             return;
 957         }
 958
 959         // Find the highest local scope containing the specified scope.
 960         while (scope && scope.parent != this.globalScope) {
 961             scope = scope.parent;
 962         }
 963
 964         //assert scope.getParentScope() == globalScope;
 965         scope.preventMunging();
 966     },
 967
 968     getIdentifier: function(symbol, scope) {
 969         var identifier;
 970         while (scope != false) {
 971             identifier = scope.getIdentifier(symbol);
 972             //println("ScopeParser.getIdentgetUsedSymbols("+symbol+")=" + scope.getUsedSymbols().join(','));
 973             if (identifier) {
 974                 return identifier;
 975             }
 976             scope = scope.parent;
 977         }
 978         return false;
 979     }
 980 };