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                 case "PUNC.LEFT_PAREN": // (
 325                     print('SCOPE-CURLY/PAREN:' + token.toString());
 326                     //println("<i>"+token.data+"</i>");
 327                     var curTS = this.ts;
 328                     if (token.props) {
 329
 330                         for (var prop in token.props) {
 331                             if (token.props[prop].val.data == 'function') {
 332                                 // parse a function..
 333                                 this.parseFunctProp(token.props[prop]);
 334                                 continue;
 335                             }
 336                             // key value..
 337
 338                             this.ts = new TokenStream(token.props[prop].val);
 339                             this.parseScope(scope);
 340
 341                         }
 342                         this.ts = curTS;
 343
 344                         // it's an object literal..
 345                         // the values could be replaced..
 346                         break;
 347                     }
 348
 349
 350                     var _this = this;
 351                     token.items.forEach(function(expr) {
 352                           _this.ts = new TokenStream(expr);
 353                           _this.parseExpression(scope)
 354                     });
 355                     this.ts = curTS;
 356                     //print("NOT PROPS"); Seed.quit();
 357
 358                     //isObjectLitAr.push(false);
 359                     //this.braceNesting++;
 360
 361                     //print(">>>>>> OBJLIT PUSH(false)" + this.braceNesting);
 362                     break;
 363
 364                 case "PUNC.RIGHT_CURLY": // }
 365                     print("<< EXIT SCOPE");
 366                     return;
 367                 /*
 368                     //println("<i>"+token.data+"</i>");
 369                     this.braceNesting--;
 370                     isObjectLitAr.pop();
 371                     //print(">>>>>> OBJLIT POP"+ this.braceNesting);
 372                         //assert braceNesting >= scope.getBra ceNesting();
 373
 374                     if (this.braceNesting < expressionBraceNesting) {
 375                         var ls = this.scopes.pop();
 376                         ls.getUsedSymbols();
 377                         // eat symbol if we are currently at {
 378                         if (this.ts.look(0).data == '{') {
 379                             this.ts.nextTok();
 380                         }
 381
 382                         print("<<<<<<<EXIT SCOPE" +this.scopes.length);
 383                         return;
 384                     }
 385                     break;
 386 */
 387                 case "KEYW.WITH":
 388                     print('SCOPE-WITH:' + token.toString());
 389                     //println("<i>"+token.data+"</i>");
 390                     if (this.mode == "BUILDING_SYMBOL_TREE") {
 391                         // Inside a 'with' block, it is impossible to figure out
 392                         // statically whether a symbol is a local variable or an
 393                         // object member. As a consequence, the only thing we can
 394                         // do is turn the obfuscation off for the highest scope
 395                         // containing the 'with' block.
 396                         this.protectScopeFromObfuscation(scope);
 397                         this.warn("Using 'with' is not recommended." + (this.munge ? " Moreover, using 'with' reduces the level of compression!" : ""), true);
 398                     }
 399                     break;
 400
 401                 case "KEYW.CATCH":
 402                     print('SCOPE-CATCH:' + token.toString());
 403                     //println("<i>"+token.data+"</i>");
 404                     this.parseCatch();
 405                     break;
 406                 /*
 407                 case Token.SPECIALCOMMENT:
 408                         if (mode == BUILDING_SYMBOL_TREE) {
 409                             protectScopeFromObfuscation(scope);
 410                             this.warn("Using JScript conditional comments is not recommended." + (munge ? " Moreover, using JScript conditional comments reduces the level of compression." : ""), true);
 411                         }
 412                         break;
 413                 */
 414
 415                 case "STRN.DOUBLE_QUOTE": // used for object lit detection..
 416                 case "STRN.SINGLE_QUOTE":
 417                     print('SCOPE-STRING:' + token.toString());
 418                     //println("<i>"+token.data+"</i>");
 419
 420                     if (this.ts.lookTok(-1).data == '{' && this.ts.lookTok(1).data == ':') {
 421                         // then we are in an object lit.. -> we need to flag the brace as such...
 422                         isObjectLitAr.pop();
 423                         isObjectLitAr.push(true);
 424                         //print(">>>>>> OBJLIT REPUSH(true)");
 425                     }
 426                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 427
 428                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ':' &&
 429                         ( this.ts.lookTok(-1).data == '{'  ||  this.ts.lookTok(-1).data == ':' )) {
 430                         // see if we can replace..
 431                         // remove the quotes..
 432                         // should do a bit more checking!!!! (what about wierd char's in the string..
 433                         var str = token.data.substring(1,token.data.length-1);
 434                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 435                             token.outData = str;
 436                         }
 437
 438
 439
 440                     }
 441
 442
 443
 444                     break;
 445
 446                 case "NAME.NAME":
 447                     print('SCOPE-NAME:' + token.toString());
 448                     //print("DEAL WITH NAME:");
 449                     // got identifier..
 450
 451                     // look for  { ** : <- indicates obj literal.. ** this could occur with numbers ..
 452                     if ((this.ts.lookTok(-1).data == "{") && (this.ts.lookTok(1).data == ":")) {
 453                         isObjectLitAr.pop();
 454                         isObjectLitAr.push(true);
 455                         //print(">>>>>> OBJLIT REPUSH(true)");
 456                         //println("<i>"+token.data+"</i>");
 457                         break;
 458                     }
 459                    // print("DEAL WITH obj lit:");
 460                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 461
 462                     if (isInObjectLitAr && (this.ts.lookTok(1).data == ":") && (this.ts.lookTok(-1).data == ",")) {
 463                         // skip, it's an object lit key..
 464                         //println("<i>"+token.data+"</i>");
 465                         break;
 466                     }
 467
 468
 469                     // skip anyting with "." before it..!!
 470
 471                     if (this.ts.lookTok(-1).data == ".") {
 472                         // skip, it's an object prop.
 473                         //println("<i>"+token.data+"</i>");
 474                         break;
 475                     }
 476                     //print("SYMBOL: " + token.toString());
 477
 478                     symbol = token.data;
 479                     if (this.mode == 'PASS2_SYMBOL_TREE') {
 480
 481                         //println("GOT IDENT: -2 : " + this.ts.lookT(-2).toString() + " <BR> ..... -1 :  " +  this.ts.lookT(-1).toString() + " <BR> ");
 482
 483                         //print ("MUNGE?" + symbol);
 484
 485                         //println("GOT IDENT: <B>" + symbol + "</B><BR/>");
 486
 487                             //println("GOT IDENT (2): <B>" + symbol + "</B><BR/>");
 488                         identifier = this.getIdentifier(symbol, scope);
 489
 490                         if (identifier == false) {
 491 // BUG!find out where builtin is defined...
 492                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 493                                 // Here, we found an undeclared and un-namespaced symbol that is
 494                                 // 3 characters or less in length. Declare it in the global scope.
 495                                 // We don't need to declare longer symbols since they won't cause
 496                                 // any conflict with other munged symbols.
 497                                 this.globalScope.declareIdentifier(symbol, token);
 498                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 499                             }
 500
 501                             //println("GOT IDENT IGNORE(3): <B>" + symbol + "</B><BR/>");
 502                         } else {
 503                             token.identifier = identifier;
 504                             identifier.refcount++;
 505                         }
 506                     }
 507
 508                     break;
 509                     //println("<B>SID</B>");
 510                 default:
 511                     if (token.type != 'KEYW') {
 512                         break;
 513                     }
 514                     print('SCOPE-KEYW:' + token.toString());
 515                    // print("Check eval:");
 516
 517                     symbol = token.data;
 518
 519                      if (this.mode == 'BUILDING_SYMBOL_TREE') {
 520
 521                         if (symbol == "eval") {
 522                             // look back one and see if we can find a comment!!!
 523                             if (this.ts.look(-1).type == "COMM") {
 524                                 // look for eval:var:noreplace\n
 525                                 var _t = this;
 526                                 this.ts.look(-1).data.replace(/eval:var:([a-z_]+)/ig, function(m, a) {
 527
 528                                     var hi = _t.getIdentifier(a, scope);
 529                                    // println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 530                                     if (hi) {
 531                                      //   println("PROTECT "+a+" from munge");
 532                                         hi.toMunge = false;
 533                                     }
 534
 535                                 });
 536
 537
 538                             } else {
 539
 540
 541                                 this.protectScopeFromObfuscation(scope);
 542                                 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);
 543                             }
 544
 545                         }
 546
 547                     }
 548                     break;
 549
 550
 551             } // end switch
 552
 553
 554             //print("parseScope TOK : " + token.toString());
 555             token = this.ts.nextTok();
 556             //if (this.ts.nextT()) break;
 557
 558         }
 559         print("<<< EXIT SCOPE");
 560         //print("<<<<<<<EXIT SCOPE ERR?" +this.scopes.length);
 561     },
 562
 563     expN : 0,
 564     parseExpression : function() {
 565
 566         // Parse the expression until we encounter a comma or a semi-colon
 567         // in the same brace nesting, bracket nesting and paren nesting.
 568         // Parse functions if any...
 569         //println("<i>EXP</i><BR/>");
 570         !this.debug || print("PARSE EXPR");
 571         this.expN++;
 572
 573         // for printing stuff..
 574
 575
 576
 577         var symbol;
 578         var token;
 579         var currentScope;
 580         var identifier;
 581
 582         var expressionBraceNesting = this.braceNesting + 0;
 583         var bracketNesting = 0;
 584         var parensNesting = 0;
 585         var isInObjectLitAr;
 586         var isObjectLitAr = [ false ];
 587
 588         currentScope = this.scopes[this.scopes.length-1];
 589
 590
 591         //print(scopeIndent + ">> ENTER EXPRESSION" + this.expN);
 592         while (token = this.ts.nextTok()) {
 593
 594
 595
 596            /*
 597             // moved out of loop?
 598            currentScope = this.scopes[this.scopes.length-1];
 599
 600             var scopeIndent = '';
 601             this.scopes.forEach(function() {
 602                 scopeIndent += '   ';
 603             });
 604            */
 605
 606            //this.dumpToken(token,  this.scopes, this.braceNesting );
 607            print('EXP' +  token.toString());
 608
 609
 610             //println("<i>"+token.data+"</i>");
 611             //this.log("EXP:" + token.data);
 612             switch (token.type) {
 613                 case 'PUNC':
 614                     print("EXPR-PUNC:" + JSON.stringify(token, null, 4));
 615
 616                     switch(token.data) {
 617
 618                         case ';':
 619                         case ',':
 620                             if (this.braceNesting == expressionBraceNesting &&
 621                                     bracketNesting == 0 &&
 622                                     parensNesting == 0) {
 623                                 print("<< EXIT EXPRESSION");
 624                                 this.expN--;
 625                                 return;
 626                             }
 627                             break;
 628
 629
 630
 631                         case '{': //Token.LC:
 632                             isObjectLitAr.push(false);
 633
 634                             this.braceNesting++;
 635                             ///print(">>>>> EXP PUSH(false)"+this.braceNesting);
 636                             break;
 637
 638                         case '}': //Token.RC:
 639                             this.braceNesting--;
 640                             isObjectLitAr.pop();
 641                             //print(">>>>> EXP POP" + this.braceNesting);
 642                            // assert braceNesting >= expressionBraceNesting;
 643                             break;
 644
 645                         case '[': //Token.LB:
 646
 647                             var ts = this.ts;
 648                             var _this = this;
 649                             token.items.forEach(function(ns) {
 650                                  print("EXPR-PUNC-MAKE:" + JSON.stringify(ns, null, 4));
 651                                 _this.ts = new TokenStream(ns);
 652                                 //_this.ts.cursor--;
 653                                 _this.parseExpression();
 654                             });
 655                             this.ts = ts;
 656
 657                             break;
 658
 659                         case ']': //Token.RB:
 660                             print("<< EXIT EXPRESSION");
 661                             return;
 662
 663
 664                         case '(': //Token.LP:
 665                             parensNesting++;
 666                             break;
 667
 668                         case ')': //Token.RP:
 669                             parensNesting--;
 670                             break;
 671                     }
 672                     break;
 673
 674                 case 'STRN': // used for object lit detection..
 675                     print("EXPR-STR:" + JSON.stringify(token, null, 4));
 676                     if (this.ts.lookTok(-1).data == "{" && this.ts.lookTok(1).data == ":" ) {
 677                         // then we are in an object lit.. -> we need to flag the brace as such...
 678                         isObjectLitAr.pop();
 679                         isObjectLitAr.push(true);
 680                         //print(">>>>> EXP PUSH(true)");
 681                     }
 682
 683
 684
 685                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 686                     if (isInObjectLitAr &&  this.ts.lookTok(1).data == ":"  &&
 687                         ( this.ts.lookTok(-1).data == "{"  ||  this.ts.lookTok(-1).data == "," )) {
 688                         // see if we can replace..
 689                         // remove the quotes..
 690                         var str = token.data.substring(1,token.data.length-1);
 691                         if (/^[a-z_]+$/i.test(str) && ScopeParser.idents.indexOf(str) < 0) {
 692                             token.outData = str;
 693                         }
 694
 695
 696
 697                     }
 698
 699                     break;
 700
 701
 702
 703                 case 'NAME':
 704                     print("EXPR-NAME:" + JSON.stringify(token, null, 4));
 705                     symbol = token.data;
 706                     //print("in NAME = " + token.toString());
 707                     //print("in NAME 0: " + this.ts.look(0).toString());
 708                     //print("in NAME 2: " + this.ts.lookTok(2).toString());
 709                     if (this.ts.look(0).data == "{"  && this.ts.lookTok(2).data == ":") {
 710                         // then we are in an object lit.. -> we need to flag the brace as such...
 711                         isObjectLitAr.pop();
 712                         isObjectLitAr.push(true);
 713                          //print(">>>>> EXP  PUSH(true)");
 714                         break;
 715                     }
 716
 717                     isInObjectLitAr = isObjectLitAr[isObjectLitAr.length-1];
 718                     //print ("isInObjectLitAr : " + isInObjectLitAr + ' ' + token.toString());
 719
 720                     if (isInObjectLitAr && this.ts.lookTok(0).data == "," && this.ts.lookTok(2).data == ":") {
 721                         break;
 722                     }
 723                     //print(this.ts.lookTok(0).data);
 724                     if (this.ts.lookTok(0).data == ".") {
 725                         //skip '.'
 726                         break;
 727                     }
 728
 729                      if (this.mode == 'PASS2_SYMBOL_TREE') {
 730
 731                         identifier = this.getIdentifier(symbol, currentScope);
 732                         //println("<B>??</B>");
 733                         if (identifier == false) {
 734
 735                             if (symbol.length <= 3 &&  Scope.builtin.indexOf(symbol) < 0) {
 736                                 // Here, we found an undeclared and un-namespaced symbol that is
 737                                 // 3 characters or less in length. Declare it in the global scope.
 738                                 // We don't need to declare longer symbols since they won't cause
 739                                 // any conflict with other munged symbols.
 740                                 this.globalScope.declareIdentifier(symbol, token);
 741                                 this.warn("Found an undeclared symbol: " + symbol + ' (line:' + token.line + ')', true);
 742                             } else {
 743                                 //println("undeclared")
 744                             }
 745
 746
 747                         } else {
 748                             //println("<B>++</B>");
 749                             token.identifier = identifier;
 750                             identifier.refcount++;
 751                         }
 752
 753                     }
 754                     break;
 755
 756
 757
 758
 759                     //println("<B>EID</B>");
 760                 case 'KEYW':
 761                     print("EXPR-KEYW:" + JSON.stringify(token, null, 4));
 762                     if (token.name == "FUNCTION") {
 763
 764                         this.parseFunctionDeclaration();
 765                         break;
 766                     }
 767
 768
 769
 770                     symbol = token.data;
 771                     if (this.mode == 'BUILDING_SYMBOL_TREE') {
 772
 773                         if (symbol == "eval") {
 774                             if (this.ts.look(-1).type == 'COMM') {
 775                                 // look for eval:var:noreplace\n
 776                                 var _t = this;
 777                                 this.ts.look(-1).data.replace(/eval:var:([a-z]+)/ig, function(m, a) {
 778                                     var hi = _t.getIdentifier(a, currentScope);
 779                                    //println("PROTECT "+a+" from munge" + (hi ? "FOUND" : "MISSING"));
 780                                     if (hi) {
 781                                       //  println("PROTECT "+a+" from munge");
 782                                         hi.toMunge = false;
 783                                     }
 784
 785
 786                                 });
 787
 788                             } else {
 789                                 this.protectScopeFromObfuscation(currentScope);
 790                                 this.warn("Using 'eval' is not recommended." + (this.munge ? " Moreover, using 'eval' reduces the level of compression!" : ""), true);
 791                             }
 792
 793
 794                         }
 795                         break;
 796                     }
 797                 default:
 798                     print("EXPR-SKIP:" + JSON.stringify(token, null, 4));
 799                     break;
 800             }
 801
 802         }
 803         print("<< EXIT EXPRESSION");
 804         this.expN--;
 805     },
 806
 807
 808     parseCatch : function() {
 809
 810         var symbol;
 811         var token;
 812         var currentScope;
 813         var identifier;
 814
 815         //token = getToken(-1);
 816         //assert token.getType() == Token.CATCH;
 817         token = this.ts.nextTok();
 818         //assert token.getType() == Token.LP; (
 819         token = this.ts.nextTok();
 820         //assert token.getType() == Token.NAME;
 821
 822         symbol = token.data;
 823         currentScope = this.scopes[this.scopes.length-1];
 824
 825         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 826             // We must declare the exception identifier in the containing function
 827             // scope to avoid errors related to the obfuscation process. No need to
 828             // display a warning if the symbol was already declared here...
 829             currentScope.declareIdentifier(symbol, token);
 830         } else {
 831             //?? why inc the refcount?? - that should be set when building the tree???
 832             identifier = this.getIdentifier(symbol, currentScope);
 833             identifier.refcount++;
 834         }
 835
 836         token = this.ts.nextTok();
 837         //assert token.getType() == Token.RP; // )
 838     },
 839
 840     parseFunctionDeclaration : function()
 841     {
 842         //print("PARSE FUNCTION");
 843         var symbol;
 844         var token;
 845         var currentScope  = false;
 846         var fnScope = false;
 847         var identifier;
 848         var b4braceNesting = this.braceNesting + 0;
 849
 850         //this.logR("<B>PARSING FUNCTION</B>");
 851         currentScope = this.scopes[this.scopes.length-1];
 852
 853         token = this.ts.nextTok();
 854         if (token.type == "NAME") {
 855             if (this.mode == 'BUILDING_SYMBOL_TREE') {
 856                 // Get the name of the function and declare it in the current scope.
 857                 symbol = token.data;
 858                 if (currentScope.getIdentifier(symbol) != false) {
 859                     this.warn("The function " + symbol + " has already been declared in the same scope...", true);
 860                 }
 861                 currentScope.declareIdentifier(symbol,token);
 862             }
 863             token =  this.ts.nextTok();
 864         }
 865
 866         //assert token.getType() == Token.LP;
 867         if (this.mode == 'BUILDING_SYMBOL_TREE') {
 868             fnScope = new Scope(this.braceNesting, currentScope, token.n, '');
 869
 870             //println("STORING SCOPE" + this.ts.cursor);
 871
 872             this.indexedScopes[this.ts.cursor] = fnScope;
 873
 874         } else {
 875             //qln("FETCHING SCOPE" + this.ts.cursor);
 876             fnScope = this.indexedScopes[this.ts.cursor];
 877
 878         }
 879
 880         print('FUNC-PARSE:' + JSON.stringify(token,null,4));
 881         // Parse function arguments.
 882         var args = token.items;
 883         for (var argpos =0; argpos < args.length; argpos++) {
 884
 885             token = args[argpos][0];
 886            // print ("FUNC ARGS: " + token.toString())
 887             //assert token.getType() == Token.NAME ||
 888             //        token.getType() == Token.COMMA;
 889             if (token.type == 'NAME' && this.mode == 'BUILDING_SYMBOL_TREE') {
 890                 symbol = token.data;
 891                 identifier = fnScope.declareIdentifier(symbol,token);
 892                 if (symbol == "$super" && argpos == 0) {
 893                     // Exception for Prototype 1.6...
 894                     identifier.preventMunging();
 895                 }
 896                 argpos++;
 897             }
 898         }
 899
 900         token = this.ts.nextTok();
 901         //print('FUNC-BODY:' + JSON.stringify(token.items,null,4));
 902         //Seed.quit();
 903         //print(token.toString());
 904         // assert token.getType() == Token.LC;
 905         //this.braceNesting++;
 906
 907         //token = this.ts.nextTok();
 908         //print(token.toString());
 909         var outTS = this.ts;
 910         var _this = this;
 911         token.items.forEach(function(tar) {
 912             _this.ts = new TokenStream(tar);
 913             _this.parseScope(fnScope);
 914
 915         });
 916
 917         //print(JSON.stringify(this.ts,null,4));
 918         //this.parseScope(fnScope);
 919         this.ts = outTS;
 920         // now pop it off the stack!!!
 921
 922         //this.braceNesting = b4braceNesting;
 923         //print("ENDFN -1: " + this.ts.lookTok(-1).toString());
 924         //print("ENDFN 0: " + this.ts.lookTok(0).toString());
 925         //print("ENDFN 1: " + this.ts.lookTok(1).toString());
 926     },
 927
 928     protectScopeFromObfuscation : function(scope) {
 929             //assert scope != null;
 930
 931         if (scope == this.globalScope) {
 932             // The global scope does not get obfuscated,
 933             // so we don't need to worry about it...
 934             return;
 935         }
 936
 937         // Find the highest local scope containing the specified scope.
 938         while (scope && scope.parent != this.globalScope) {
 939             scope = scope.parent;
 940         }
 941
 942         //assert scope.getParentScope() == globalScope;
 943         scope.preventMunging();
 944     },
 945
 946     getIdentifier: function(symbol, scope) {
 947         var identifier;
 948         while (scope != false) {
 949             identifier = scope.getIdentifier(symbol);
 950             //println("ScopeParser.getIdentgetUsedSymbols("+symbol+")=" + scope.getUsedSymbols().join(','));
 951             if (identifier) {
 952                 return identifier;
 953             }
 954             scope = scope.parent;
 955         }
 956         return false;
 957     }
 958 };