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