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                     print('SCOPE-FUNC:' + JSON.stringify(token,null,4));
 317                     //println("<i>"+token.data+"</i>");
 318                      var bn = this.braceNesting;
 319                     this.parseFunctionDeclaration();
 320                      this.braceNesting = bn;
 321                     break;
 322
 323                 case "PUNC.LEFT_CURLY": // {
 324
 325                     //println("<i>"+token.data+"</i>");
 326                     var curTS = this.ts;
 327                     if (token.props) {
 328
 329                         for (var prop in token.props) {
 330                             if (token.props[prop].val.data == 'function') {
 331                                 // parse a function..
 332                                 this.parseFunctProp(token.props[prop]);
 333                                 continue;
 334                             }
 335                             // key value..
 336
 337                             this.ts = new TokenStream(token.props[prop].val);
 338                             this.parseScope(scope);
 339
 340                         }
 341                         this.ts = curTS;
 342
 343                         // it's an object literal..
 344                         // the values could be replaced..
 345                         break;
 346                     }
 347
 348                     print('SCOPE-CURLY:' + JSON.stringify(token,null,4));
 349                     var _this = this;
 350                     token.items.forEach(function(expr) {
 351                           _this.ts = new TokenStream(expr);
 352                           _this.parseExpression(scope)
 353                     });
 354                     this.ts = curTS;
 355                     //print("NOT PROPS"); Seed.quit();
 356
 357                     //isObjectLitAr.push(false);
 358                     //this.braceNesting++;
 359
 360                     //print(">>>>>> OBJLIT PUSH(false)" + this.braceNesting);
 361                     break;
 362
 363                 case "PUNC.RIGHT_CURLY": // }
 364                     return;
 365                 /*
 366                     //println("<i>"+token.data+"</i>");
 367                     this.braceNesting--;
 368                     isObjectLitAr.pop();
 369                     //print(">>>>>> OBJLIT POP"+ this.braceNesting);
 370                         //assert braceNesting >= scope.getBra ceNesting();
 371
 372                     if (this.braceNesting < expressionBraceNesting) {
 373                         var ls = this.scopes.pop();
 374                         ls.getUsedSymbols();
 375                         // eat symbol if we are currently at {
 376                         if (this.ts.look(0).data == '{') {
 377                             this.ts.nextTok();
 378                         }
 379
 380                         print("<<<<<<<EXIT SCOPE" +this.scopes.length);
 381                         return;
 382                     }
 383                     break;
 384 */
 385                 case "KEYW.WITH":
 386                     print('SCOPE-WITH:' + token.toString());
 387                     //println("<i>"+token.data+"</i>");
 388                     if (this.mode == "BUILDING_SYMBOL_TREE") {
 389                         // Inside a 'with' block, it is impossible to figure out
 390                         // statically whether a symbol is a local variable or an
 391                         // object member. As a consequence, the only thing we can
 392                         // do is turn the obfuscation off for the highest scope
 393                         // containing the 'with' block.
 394                         this.protectScopeFromObfuscation(scope);
 395                         this.warn("Using 'with' is not recommended." + (this.munge ? " Moreover, using 'with' reduces the level of compression!" : ""), true);
 396                     }
 397                     break;
 398
 399                 case "KEYW.CATCH":
 400                     print('SCOPE-CATCH:' + token.toString());
 401                     //println("<i>"+token.data+"</i>");
 402                     this.parseCatch();
 403                     break;
 404                 /*
 405                 case Token.SPECIALCOMMENT:
 406                         if (mode == BUILDING_SYMBOL_TREE) {
 407                             protectScopeFromObfuscation(scope);
 408                             this.warn("Using JScript conditional comments is not recommended." + (munge ? " Moreover, using JScript conditional comments reduces the level of compression." : ""), true);
 409                         }
 410                         break;
 411                 */
 412
 413                 case "STRN.DOUBLE_QUOTE": // used for object lit detection..
 414                 case "STRN.SINGLE_QUOTE":
 415                     print('SCOPE-STRING:' + token.toString());
 416                     //println("<i>"+token.data+"</i>");
 417
 418                     if (this.ts.lookTok(-1).data == '{' && this.ts.lookTok(1).data == ':') {
 419                         // then we are in an object lit.. -> we need to flag the brace as such...
 420                         isObjectLitAr.pop();
 421                         isObjectLitAr.push(true);
 422                         //print(">>>>>> OBJLIT REPUSH(true)");
 423                     }
 424                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 425
 426                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ':' &&
 427                         ( this.ts.lookTok(-1).data == '{'  ||  this.ts.lookTok(-1).data == ':' )) {
 428                         // see if we can replace..
 429                         // remove the quotes..
 430                         // should do a bit more checking!!!! (what about wierd char's in the string..
 431                         var str = token.data.substring(1,token.data.length-1);
 432                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 433                             token.outData = str;
 434                         }
 435
 436
 437
 438                     }
 439
 440
 441
 442                     break;
 443
 444                 case "NAME.NAME":
 445                     print('SCOPE-NAME:' + token.toString());
 446                     //print("DEAL WITH NAME:");
 447                     // got identifier..
 448
 449                     // look for  { ** : <- indicates obj literal.. ** this could occur with numbers ..
 450                     if ((this.ts.lookTok(-1).data == "{") && (this.ts.lookTok(1).data == ":")) {
 451                         isObjectLitAr.pop();
 452                         isObjectLitAr.push(true);
 453                         //print(">>>>>> OBJLIT REPUSH(true)");
 454                         //println("<i>"+token.data+"</i>");
 455                         break;
 456                     }
 457                    // print("DEAL WITH obj lit:");
 458                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 459
 460                     if (isInObjectLitAr && (this.ts.lookTok(1).data == ":") && (this.ts.lookTok(-1).data == ",")) {
 461                         // skip, it's an object lit key..
 462                         //println("<i>"+token.data+"</i>");
 463                         break;
 464                     }
 465
 466
 467                     // skip anyting with "." before it..!!
 468
 469                     if (this.ts.lookTok(-1).data == ".") {
 470                         // skip, it's an object prop.
 471                         //println("<i>"+token.data+"</i>");
 472                         break;
 473                     }
 474                     //print("SYMBOL: " + token.toString());
 475
 476                     symbol = token.data;
 477                     if (this.mode == 'PASS2_SYMBOL_TREE') {
 478
 479                         //println("GOT IDENT: -2 : " + this.ts.lookT(-2).toString() + " <BR> ..... -1 :  " +  this.ts.lookT(-1).toString() + " <BR> ");
 480
 481                         //print ("MUNGE?" + symbol);
 482
 483                         //println("GOT IDENT: <B>" + symbol + "</B><BR/>");
 484
 485                             //println("GOT IDENT (2): <B>" + symbol + "</B><BR/>");
 486                         identifier = this.getIdentifier(symbol, scope);
 487
 488                         if (identifier == false) {
 489 // BUG!find out where builtin is defined...
 490                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 491                                 // Here, we found an undeclared and un-namespaced symbol that is
 492                                 // 3 characters or less in length. Declare it in the global scope.
 493                                 // We don't need to declare longer symbols since they won't cause
 494                                 // any conflict with other munged symbols.
 495                                 this.globalScope.declareIdentifier(symbol, token);
 496                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 497                             }
 498
 499                             //println("GOT IDENT IGNORE(3): <B>" + symbol + "</B><BR/>");
 500                         } else {
 501                             token.identifier = identifier;
 502                             identifier.refcount++;
 503                         }
 504                     }
 505
 506                     break;
 507                     //println("<B>SID</B>");
 508                 default:
 509                     if (token.type != 'KEYW') {
 510                         break;
 511                     }
 512                     print('SCOPE-KEYW:' + token.toString());
 513                    // print("Check eval:");
 514
 515                     symbol = token.data;
 516
 517                      if (this.mode == 'BUILDING_SYMBOL_TREE') {
 518
 519                         if (symbol == "eval") {
 520                             // look back one and see if we can find a comment!!!
 521                             if (this.ts.look(-1).type == "COMM") {
 522                                 // look for eval:var:noreplace\n
 523                                 var _t = this;
 524                                 this.ts.look(-1).data.replace(/eval:var:([a-z_]+)/ig, function(m, a) {
 525
 526                                     var hi = _t.getIdentifier(a, scope);
 527                                    // println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 528                                     if (hi) {
 529                                      //   println("PROTECT "+a+" from munge");
 530                                         hi.toMunge = false;
 531                                     }
 532
 533                                 });
 534
 535
 536                             } else {
 537
 538
 539                                 this.protectScopeFromObfuscation(scope);
 540                                 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);
 541                             }
 542
 543                         }
 544
 545                     }
 546                     break;
 547
 548
 549             } // end switch
 550
 551
 552             //print("parseScope TOK : " + token.toString());
 553             token = this.ts.nextTok();
 554             //if (this.ts.nextT()) break;
 555
 556         }
 557         //print("<<<<<<<EXIT SCOPE ERR?" +this.scopes.length);
 558     },
 559
 560     expN : 0,
 561     parseExpression : function() {
 562
 563         // Parse the expression until we encounter a comma or a semi-colon
 564         // in the same brace nesting, bracket nesting and paren nesting.
 565         // Parse functions if any...
 566         //println("<i>EXP</i><BR/>");
 567         !this.debug || print("PARSE EXPR");
 568         this.expN++;
 569
 570         // for printing stuff..
 571
 572
 573
 574         var symbol;
 575         var token;
 576         var currentScope;
 577         var identifier;
 578
 579         var expressionBraceNesting = this.braceNesting + 0;
 580         var bracketNesting = 0;
 581         var parensNesting = 0;
 582         var isInObjectLitAr;
 583         var isObjectLitAr = [ false ];
 584
 585         currentScope = this.scopes[this.scopes.length-1];
 586
 587
 588         //print(scopeIndent + ">> ENTER EXPRESSION" + this.expN);
 589         while (token = this.ts.nextTok()) {
 590
 591
 592
 593            /*
 594             // moved out of loop?
 595            currentScope = this.scopes[this.scopes.length-1];
 596
 597             var scopeIndent = '';
 598             this.scopes.forEach(function() {
 599                 scopeIndent += '   ';
 600             });
 601            */
 602
 603            //this.dumpToken(token,  this.scopes, this.braceNesting );
 604            print('EXP' +  token.toString());
 605
 606
 607             //println("<i>"+token.data+"</i>");
 608             //this.log("EXP:" + token.data);
 609             switch (token.type) {
 610                 case 'PUNC':
 611                     print("EXPR-PUNC:" + JSON.stringify(token, null, 4));
 612
 613                     switch(token.data) {
 614
 615                         case ';':
 616                         case ',':
 617                             if (this.braceNesting == expressionBraceNesting &&
 618                                     bracketNesting == 0 &&
 619                                     parensNesting == 0) {
 620                                 print("<< EXIT EXPRESSION");
 621                                 this.expN--;
 622                                 return;
 623                             }
 624                             break;
 625
 626
 627
 628                         case '{': //Token.LC:
 629                             isObjectLitAr.push(false);
 630
 631                             this.braceNesting++;
 632                             ///print(">>>>> EXP PUSH(false)"+this.braceNesting);
 633                             break;
 634
 635                         case '}': //Token.RC:
 636                             this.braceNesting--;
 637                             isObjectLitAr.pop();
 638                             //print(">>>>> EXP POP" + this.braceNesting);
 639                            // assert braceNesting >= expressionBraceNesting;
 640                             break;
 641
 642                         case '[': //Token.LB:
 643
 644                             var ts = this.ts;
 645                             var _this = this;
 646                             token.items.forEach(function(ns) {
 647                                  print("EXPR-PUNC-MAKE:" + JSON.stringify(ns, null, 4));
 648                                 _this.ts = new TokenStream(ns);
 649                                 //_this.ts.cursor--;
 650                                 _this.parseExpression();
 651                             });
 652                             this.ts = ts;
 653
 654                             break;
 655
 656                         case ']': //Token.RB:
 657                             return;
 658
 659
 660                         case '(': //Token.LP:
 661                             parensNesting++;
 662                             break;
 663
 664                         case ')': //Token.RP:
 665                             parensNesting--;
 666                             break;
 667                     }
 668                     break;
 669
 670                 case 'STRN': // used for object lit detection..
 671                     print("EXPR-STR:" + JSON.stringify(token, null, 4));
 672                     if (this.ts.lookTok(-1).data == "{" && this.ts.lookTok(1).data == ":" ) {
 673                         // then we are in an object lit.. -> we need to flag the brace as such...
 674                         isObjectLitAr.pop();
 675                         isObjectLitAr.push(true);
 676                         //print(">>>>> EXP PUSH(true)");
 677                     }
 678
 679
 680
 681                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 682                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ":"  &&
 683                         ( this.ts.lookTok(-1).data == "{"  ||  this.ts.lookTok(-1).data == "," )) {
 684                         // see if we can replace..
 685                         // remove the quotes..
 686                         var str = token.data.substring(1,token.data.length-1);
 687                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 688                             token.outData = str;
 689                         }
 690
 691
 692
 693                     }
 694
 695                     break;
 696
 697
 698
 699                 case 'NAME':
 700                     print("EXPR-NAME:" + JSON.stringify(token, null, 4));
 701                     symbol = token.data;
 702                     //print("in NAME = " + token.toString());
 703                     //print("in NAME 0: " + this.ts.look(0).toString());
 704                     //print("in NAME 2: " + this.ts.lookTok(2).toString());
 705                     if (this.ts.look(0).data == "{"  && this.ts.lookTok(2).data == ":") {
 706                         // then we are in an object lit.. -> we need to flag the brace as such...
 707                         isObjectLitAr.pop();
 708                         isObjectLitAr.push(true);
 709                          //print(">>>>> EXP  PUSH(true)");
 710                         break;
 711                     }
 712
 713                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 714                     //print ("isInObjectLitAr : " + isInObjectLitAr + ' ' + token.toString());
 715
 716                     if (isInObjectLitAr && this.ts.lookTok(0).data == "," && this.ts.lookTok(2).data == ":") {
 717                         break;
 718                     }
 719                     //print(this.ts.lookTok(0).data);
 720                     if (this.ts.lookTok(0).data == ".") {
 721                         //skip '.'
 722                         break;
 723                     }
 724
 725                      if (this.mode == 'PASS2_SYMBOL_TREE') {
 726
 727                         identifier = this.getIdentifier(symbol, currentScope);
 728                         //println("<B>??</B>");
 729                         if (identifier == false) {
 730
 731                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 732                                 // Here, we found an undeclared and un-namespaced symbol that is
 733                                 // 3 characters or less in length. Declare it in the global scope.
 734                                 // We don't need to declare longer symbols since they won't cause
 735                                 // any conflict with other munged symbols.
 736                                 this.globalScope.declareIdentifier(symbol, token);
 737                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 738                             } else {
 739                                 //println("undeclared")
 740                             }
 741
 742
 743                         } else {
 744                             //println("<B>++</B>");
 745                             token.identifier = identifier;
 746                             identifier.refcount++;
 747                         }
 748
 749                     }
 750                     break;
 751
 752
 753
 754
 755                     //println("<B>EID</B>");
 756                 case 'KEYW':
 757                     print("EXPR-KEYW:" + JSON.stringify(token, null, 4));
 758                     if (token.name == "FUNCTION") {
 759
 760                         this.parseFunctionDeclaration();
 761                         break;
 762                     }
 763
 764
 765
 766                     symbol = token.data;
 767                     if (this.mode == 'BUILDING_SYMBOL_TREE') {
 768
 769                         if (symbol == "eval") {
 770                             if (this.ts.look(-1).type == 'COMM') {
 771                                 // look for eval:var:noreplace\n
 772                                 var _t = this;
 773                                 this.ts.look(-1).data.replace(/eval:var:([a-z]+)/ig, function(m, a) {
 774                                     var hi = _t.getIdentifier(a, currentScope);
 775                                    //println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 776                                     if (hi) {
 777                                       //  println("PROTECT "+a+" from munge");
 778                                         hi.toMunge = false;
 779                                     }
 780
 781
 782                                 });
 783
 784                             } else {
 785                                 this.protectScopeFromObfuscation(currentScope);
 786                                 this.warn("Using 'eval' is not recommended." + (this.munge ? " Moreover, using 'eval' reduces the level of compression!" : ""), true);
 787                             }
 788
 789
 790                         }
 791                         break;
 792                     }
 793                 default:
 794                     print("EXPR-SKIP:" + JSON.stringify(token, null, 4));
 795                     break;
 796             }
 797
 798         }
 799         print("<< EXIT EXPRESSION");
 800         this.expN--;
 801     },
 802
 803
 804     parseCatch : function() {
 805
 806         var symbol;
 807         var token;
 808         var currentScope;
 809         var identifier;
 810
 811         //token = getToken(-1);
 812         //assert token.getType() == Token.CATCH;
 813         token = this.ts.nextTok();
 814         //assert token.getType() == Token.LP; (
 815         token = this.ts.nextTok();
 816         //assert token.getType() == Token.NAME;
 817
 818         symbol = token.data;
 819         currentScope = this.scopes[this.scopes.length-1];
 820
 821         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 822             // We must declare the exception identifier in the containing function
 823             // scope to avoid errors related to the obfuscation process. No need to
 824             // display a warning if the symbol was already declared here...
 825             currentScope.declareIdentifier(symbol, token);
 826         } else {
 827             //?? why inc the refcount?? - that should be set when building the tree???
 828             identifier = this.getIdentifier(symbol, currentScope);
 829             identifier.refcount++;
 830         }
 831
 832         token = this.ts.nextTok();
 833         //assert token.getType() == Token.RP; // )
 834     },
 835
 836     parseFunctionDeclaration : function()
 837     {
 838         //print("PARSE FUNCTION");
 839         var symbol;
 840         var token;
 841         var currentScope  = false;
 842         var fnScope = false;
 843         var identifier;
 844         var b4braceNesting = this.braceNesting + 0;
 845
 846         //this.logR("<B>PARSING FUNCTION</B>");
 847         currentScope = this.scopes[this.scopes.length-1];
 848
 849         token = this.ts.nextTok();
 850         if (token.type == "NAME") {
 851             if (this.mode == 'BUILDING_SYMBOL_TREE') {
 852                 // Get the name of the function and declare it in the current scope.
 853                 symbol = token.data;
 854                 if (currentScope.getIdentifier(symbol) != false) {
 855                     this.warn("The function " + symbol + " has already been declared in the same scope...", true);
 856                 }
 857                 currentScope.declareIdentifier(symbol,token);
 858             }
 859             token =  this.ts.nextTok();
 860         }
 861
 862         //assert token.getType() == Token.LP;
 863         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 864             fnScope = new Scope(this.braceNesting, currentScope, token.n, '');
 865
 866             //println("STORING SCOPE" + this.ts.cursor);
 867
 868             this.indexedScopes[this.ts.cursor] = fnScope;
 869
 870         } else {
 871             //qln("FETCHING SCOPE" + this.ts.cursor);
 872             fnScope = this.indexedScopes[this.ts.cursor];
 873
 874         }
 875
 876         print('FUNC-PARSE:' + JSON.stringify(token,null,4));
 877         // Parse function arguments.
 878         var args = token.items;
 879         for (var argpos =0; argpos < args.length; argpos++) {
 880
 881             token = args[argpos][0];
 882            // print ("FUNC ARGS: " + token.toString())
 883             //assert token.getType() == Token.NAME ||
 884             //        token.getType() == Token.COMMA;
 885             if (token.type == 'NAME' && this.mode == 'BUILDING_SYMBOL_TREE') {
 886                 symbol = token.data;
 887                 identifier = fnScope.declareIdentifier(symbol,token);
 888                 if (symbol == "$super" && argpos == 0) {
 889                     // Exception for Prototype 1.6...
 890                     identifier.preventMunging();
 891                 }
 892                 argpos++;
 893             }
 894         }
 895
 896         token = this.ts.nextTok();
 897         //print('FUNC-BODY:' + JSON.stringify(token.items,null,4));
 898         //Seed.quit();
 899         //print(token.toString());
 900         // assert token.getType() == Token.LC;
 901         //this.braceNesting++;
 902
 903         //token = this.ts.nextTok();
 904         //print(token.toString());
 905         var outTS = this.ts;
 906         var _this = this;
 907         token.items.forEach(function(tar) {
 908             _this.ts = new TokenStream(tar);
 909             _this.parseScope(fnScope);
 910
 911         });
 912
 913         //print(JSON.stringify(this.ts,null,4));
 914         //this.parseScope(fnScope);
 915         this.ts = outTS;
 916         // now pop it off the stack!!!
 917
 918         //this.braceNesting = b4braceNesting;
 919         //print("ENDFN -1: " + this.ts.lookTok(-1).toString());
 920         //print("ENDFN 0: " + this.ts.lookTok(0).toString());
 921         //print("ENDFN 1: " + this.ts.lookTok(1).toString());
 922     },
 923
 924     protectScopeFromObfuscation : function(scope) {
 925             //assert scope != null;
 926
 927         if (scope == this.globalScope) {
 928             // The global scope does not get obfuscated,
 929             // so we don't need to worry about it...
 930             return;
 931         }
 932
 933         // Find the highest local scope containing the specified scope.
 934         while (scope && scope.parent != this.globalScope) {
 935             scope = scope.parent;
 936         }
 937
 938         //assert scope.getParentScope() == globalScope;
 939         scope.preventMunging();
 940     },
 941
 942     getIdentifier: function(symbol, scope) {
 943         var identifier;
 944         while (scope != false) {
 945             identifier = scope.getIdentifier(symbol);
 946             //println("ScopeParser.getIdentgetUsedSymbols("+symbol+")=" + scope.getUsedSymbols().join(','));
 947             if (identifier) {
 948                 return identifier;
 949             }
 950             scope = scope.parent;
 951         }
 952         return false;
 953     }
 954 };