mcs/gmcs/cs-tokenizer.cs

   1 //\r
   2 // cs-tokenizer.cs: The Tokenizer for the C# compiler\r
   3 //                  This also implements the preprocessor\r
   4 //\r
   5 // Author: Miguel de Icaza (miguel@gnu.org)\r
   6 //\r
   7 // Licensed under the terms of the GNU GPL\r
   8 //\r
   9 // (C) 2001, 2002 Ximian, Inc (http://www.ximian.com)\r
  10 //\r
  11 \r
  12 /*\r
  13  * TODO:\r
  14  *   Make sure we accept the proper Unicode ranges, per the spec.\r
  15  *   Report error 1032\r
  16 */\r
  17 \r
  18 using System;\r
  19 using System.Text;\r
  20 using System.Collections;\r
  21 using System.IO;\r
  22 using System.Globalization;\r
  23 using System.Reflection;\r
  24 \r
  25 namespace Mono.CSharp\r
  26 {\r
  27         /// <summary>\r
  28         ///    Tokenizer for C# source code. \r
  29         /// </summary>\r
  30 \r
  31         public class Tokenizer : yyParser.yyInput\r
  32         {\r
  33                 SeekableStreamReader reader;\r
  34                 public SourceFile ref_name;\r
  35                 public SourceFile file_name;\r
  36                 public int ref_line = 1;\r
  37                 public int line = 1;\r
  38                 public int col = 1;\r
  39                 public int current_token;\r
  40                 bool handle_get_set = false;\r
  41                 bool handle_remove_add = false;\r
  42                 bool handle_assembly = false;\r
  43                 bool handle_constraints = false;\r
  44 \r
  45                 //\r
  46                 // Whether tokens have been seen on this line\r
  47                 //\r
  48                 bool tokens_seen = false;\r
  49 \r
  50                 //\r
  51                 // Whether a token has been seen on the file\r
  52                 // This is needed because `define' is not allowed to be used\r
  53                 // after a token has been seen.\r
  54                 //\r
  55                 bool any_token_seen = false;\r
  56                 static Hashtable tokenValues;\r
  57                 \r
  58                 private static Hashtable TokenValueName\r
  59                 {\r
  60                         get {\r
  61                                 if (tokenValues == null)\r
  62                                         tokenValues = GetTokenValueNameHash ();\r
  63 \r
  64                                 return tokenValues;\r
  65                         }\r
  66                 }\r
  67 \r
  68                 private static Hashtable GetTokenValueNameHash ()\r
  69                 {\r
  70                         Type t = typeof (Token);\r
  71                         FieldInfo [] fields = t.GetFields ();\r
  72                         Hashtable hash = new Hashtable ();\r
  73                         foreach (FieldInfo field in fields) {\r
  74                                 if (field.IsLiteral && field.IsStatic && field.FieldType == typeof (int))\r
  75                                         hash.Add (field.GetValue (null), field.Name);\r
  76                         }\r
  77                         return hash;\r
  78                 }\r
  79                 \r
  80                 //\r
  81                 // Returns a verbose representation of the current location\r
  82                 //\r
  83                 public string location {\r
  84                         get {\r
  85                                 string det;\r
  86 \r
  87                                 if (current_token == Token.ERROR)\r
  88                                         det = "detail: " + error_details;\r
  89                                 else\r
  90                                         det = "";\r
  91                                 \r
  92                                 // return "Line:     "+line+" Col: "+col + "\n" +\r
  93                                 //       "VirtLine: "+ref_line +\r
  94                                 //       " Token: "+current_token + " " + det;\r
  95                                 string current_token_name = TokenValueName [current_token] as string;\r
  96                                 if (current_token_name == null)\r
  97                                         current_token_name = current_token.ToString ();\r
  98 \r
  99                                 return String.Format ("{0} ({1},{2}), Token: {3} {4}", ref_name.Name,\r
 100                                                                                        ref_line,\r
 101                                                                                        col,\r
 102                                                                                        current_token_name,\r
 103                                                                                        det);\r
 104                         }\r
 105                 }\r
 106 \r
 107                 public bool PropertyParsing {\r
 108                         get {\r
 109                                 return handle_get_set;\r
 110                         }\r
 111 \r
 112                         set {\r
 113                                 handle_get_set = value;\r
 114                         }\r
 115                 }\r
 116 \r
 117                 public bool AssemblyTargetParsing {\r
 118                         get {\r
 119                                 return handle_assembly;\r
 120                         }\r
 121 \r
 122                         set {\r
 123                                 handle_assembly = value;\r
 124                         }\r
 125                 }\r
 126 \r
 127                 public bool EventParsing {\r
 128                         get {\r
 129                                 return handle_remove_add;\r
 130                         }\r
 131 \r
 132                         set {\r
 133                                 handle_remove_add = value;\r
 134                         }\r
 135                 }\r
 136 \r
 137                 public bool ConstraintsParsing {\r
 138                         get {\r
 139                                 return handle_constraints;\r
 140                         }\r
 141 \r
 142                         set {\r
 143                                 handle_constraints = value;\r
 144                         }\r
 145                 }\r
 146                 \r
 147                 //\r
 148                 // Class variables\r
 149                 // \r
 150                 static CharArrayHashtable[] keywords;\r
 151                 static NumberStyles styles;\r
 152                 static NumberFormatInfo csharp_format_info;\r
 153                 \r
 154                 //\r
 155                 // Values for the associated token returned\r
 156                 //\r
 157                 int putback_char;\r
 158                 Object val;\r
 159 \r
 160                 //\r
 161                 // Pre-processor\r
 162                 //\r
 163                 Hashtable defines;\r
 164 \r
 165                 const int TAKING        = 1;\r
 166                 const int TAKEN_BEFORE  = 2;\r
 167                 const int ELSE_SEEN     = 4;\r
 168                 const int PARENT_TAKING = 8;\r
 169                 const int REGION        = 16;           \r
 170 \r
 171                 //\r
 172                 // pre-processor if stack state:\r
 173                 //\r
 174                 Stack ifstack;\r
 175 \r
 176                 static System.Text.StringBuilder string_builder;\r
 177 \r
 178                 const int max_id_size = 512;\r
 179                 static char [] id_builder = new char [max_id_size];\r
 180 \r
 181                 static CharArrayHashtable [] identifiers = new CharArrayHashtable [max_id_size + 1];\r
 182 \r
 183                 const int max_number_size = 128;\r
 184                 static char [] number_builder = new char [max_number_size];\r
 185                 static int number_pos;\r
 186                 \r
 187                 //\r
 188                 // Details about the error encoutered by the tokenizer\r
 189                 //\r
 190                 string error_details;\r
 191                 \r
 192                 public string error {\r
 193                         get {\r
 194                                 return error_details;\r
 195                         }\r
 196                 }\r
 197                 \r
 198                 public int Line {\r
 199                         get {\r
 200                                 return ref_line;\r
 201                         }\r
 202                 }\r
 203 \r
 204                 public int Col {\r
 205                         get {\r
 206                                 return col;\r
 207                         }\r
 208                 }\r
 209 \r
 210                 static void AddKeyword (string kw, int token) {\r
 211                         if (keywords [kw.Length] == null) {\r
 212                                 keywords [kw.Length] = new CharArrayHashtable (kw.Length);\r
 213                         }\r
 214                         keywords [kw.Length] [kw.ToCharArray ()] = token;\r
 215                 }\r
 216 \r
 217                 static void InitTokens ()\r
 218                 {\r
 219                         keywords = new CharArrayHashtable [64];\r
 220 \r
 221                         AddKeyword ("abstract", Token.ABSTRACT);\r
 222                         AddKeyword ("as", Token.AS);\r
 223                         AddKeyword ("add", Token.ADD);\r
 224                         AddKeyword ("assembly", Token.ASSEMBLY);\r
 225                         AddKeyword ("base", Token.BASE);\r
 226                         AddKeyword ("bool", Token.BOOL);\r
 227                         AddKeyword ("break", Token.BREAK);\r
 228                         AddKeyword ("byte", Token.BYTE);\r
 229                         AddKeyword ("case", Token.CASE);\r
 230                         AddKeyword ("catch", Token.CATCH);\r
 231                         AddKeyword ("char", Token.CHAR);\r
 232                         AddKeyword ("checked", Token.CHECKED);\r
 233                         AddKeyword ("class", Token.CLASS);\r
 234                         AddKeyword ("const", Token.CONST);\r
 235                         AddKeyword ("continue", Token.CONTINUE);\r
 236                         AddKeyword ("decimal", Token.DECIMAL);\r
 237                         AddKeyword ("default", Token.DEFAULT);\r
 238                         AddKeyword ("delegate", Token.DELEGATE);\r
 239                         AddKeyword ("do", Token.DO);\r
 240                         AddKeyword ("double", Token.DOUBLE);\r
 241                         AddKeyword ("else", Token.ELSE);\r
 242                         AddKeyword ("enum", Token.ENUM);\r
 243                         AddKeyword ("event", Token.EVENT);\r
 244                         AddKeyword ("explicit", Token.EXPLICIT);\r
 245                         AddKeyword ("extern", Token.EXTERN);\r
 246                         AddKeyword ("false", Token.FALSE);\r
 247                         AddKeyword ("finally", Token.FINALLY);\r
 248                         AddKeyword ("fixed", Token.FIXED);\r
 249                         AddKeyword ("float", Token.FLOAT);\r
 250                         AddKeyword ("for", Token.FOR);\r
 251                         AddKeyword ("foreach", Token.FOREACH);\r
 252                         AddKeyword ("goto", Token.GOTO);\r
 253                         AddKeyword ("get", Token.GET);\r
 254                         AddKeyword ("if", Token.IF);\r
 255                         AddKeyword ("implicit", Token.IMPLICIT);\r
 256                         AddKeyword ("in", Token.IN);\r
 257                         AddKeyword ("int", Token.INT);\r
 258                         AddKeyword ("interface", Token.INTERFACE);\r
 259                         AddKeyword ("internal", Token.INTERNAL);\r
 260                         AddKeyword ("is", Token.IS);\r
 261                         AddKeyword ("lock", Token.LOCK);\r
 262                         AddKeyword ("long", Token.LONG);\r
 263                         AddKeyword ("namespace", Token.NAMESPACE);\r
 264                         AddKeyword ("new", Token.NEW);\r
 265                         AddKeyword ("null", Token.NULL);\r
 266                         AddKeyword ("object", Token.OBJECT);\r
 267                         AddKeyword ("operator", Token.OPERATOR);\r
 268                         AddKeyword ("out", Token.OUT);\r
 269                         AddKeyword ("override", Token.OVERRIDE);\r
 270                         AddKeyword ("params", Token.PARAMS);\r
 271                         AddKeyword ("private", Token.PRIVATE);\r
 272                         AddKeyword ("protected", Token.PROTECTED);\r
 273                         AddKeyword ("public", Token.PUBLIC);\r
 274                         AddKeyword ("readonly", Token.READONLY);\r
 275                         AddKeyword ("ref", Token.REF);\r
 276                         AddKeyword ("remove", Token.REMOVE);\r
 277                         AddKeyword ("return", Token.RETURN);\r
 278                         AddKeyword ("sbyte", Token.SBYTE);\r
 279                         AddKeyword ("sealed", Token.SEALED);\r
 280                         AddKeyword ("set", Token.SET);\r
 281                         AddKeyword ("short", Token.SHORT);\r
 282                         AddKeyword ("sizeof", Token.SIZEOF);\r
 283                         AddKeyword ("stackalloc", Token.STACKALLOC);\r
 284                         AddKeyword ("static", Token.STATIC);\r
 285                         AddKeyword ("string", Token.STRING);\r
 286                         AddKeyword ("struct", Token.STRUCT);\r
 287                         AddKeyword ("switch", Token.SWITCH);\r
 288                         AddKeyword ("this", Token.THIS);\r
 289                         AddKeyword ("throw", Token.THROW);\r
 290                         AddKeyword ("true", Token.TRUE);\r
 291                         AddKeyword ("try", Token.TRY);\r
 292                         AddKeyword ("typeof", Token.TYPEOF);\r
 293                         AddKeyword ("uint", Token.UINT);\r
 294                         AddKeyword ("ulong", Token.ULONG);\r
 295                         AddKeyword ("unchecked", Token.UNCHECKED);\r
 296                         AddKeyword ("unsafe", Token.UNSAFE);\r
 297                         AddKeyword ("ushort", Token.USHORT);\r
 298                         AddKeyword ("using", Token.USING);\r
 299                         AddKeyword ("virtual", Token.VIRTUAL);\r
 300                         AddKeyword ("void", Token.VOID);\r
 301                         AddKeyword ("volatile", Token.VOLATILE);\r
 302                         AddKeyword ("where", Token.WHERE);\r
 303                         AddKeyword ("while", Token.WHILE);\r
 304                 }\r
 305 \r
 306                 //\r
 307                 // Class initializer\r
 308                 // \r
 309                 static Tokenizer ()\r
 310                 {\r
 311                         InitTokens ();\r
 312                         csharp_format_info = NumberFormatInfo.InvariantInfo;\r
 313                         styles = NumberStyles.Float;\r
 314                         \r
 315                         string_builder = new System.Text.StringBuilder ();\r
 316                 }\r
 317 \r
 318                 int GetKeyword (char[] id, int id_len)\r
 319                 {\r
 320                         /*\r
 321                          * Keywords are stored in an array of hashtables grouped by their\r
 322                          * length.\r
 323                          */\r
 324 \r
 325                         if ((id_len >= keywords.Length) || (keywords [id_len] == null))\r
 326                                 return -1;\r
 327                         object o = keywords [id_len] [id];\r
 328 \r
 329                         if (o == null)\r
 330                                 return -1;\r
 331                         \r
 332                         int res = (int) o;\r
 333 \r
 334                         if (handle_get_set == false && (res == Token.GET || res == Token.SET))\r
 335                                 return -1;\r
 336                         if (handle_remove_add == false && (res == Token.REMOVE || res == Token.ADD))\r
 337                                 return -1;\r
 338                         if (handle_assembly == false && res == Token.ASSEMBLY)\r
 339                                 return -1;\r
 340                         if (handle_constraints == false && res == Token.WHERE)\r
 341                                 return -1;\r
 342                         return res;\r
 343                         \r
 344                 }\r
 345 \r
 346                 public Location Location {\r
 347                         get {\r
 348                                 return new Location (ref_line);\r
 349                         }\r
 350                 }\r
 351 \r
 352                 void define (string def)\r
 353                 {\r
 354                         if (!RootContext.AllDefines.Contains (def)){\r
 355                                 RootContext.AllDefines [def] = true;\r
 356                         }\r
 357                         if (defines.Contains (def))\r
 358                                 return;\r
 359                         defines [def] = true;\r
 360                 }\r
 361                 \r
 362                 public Tokenizer (SeekableStreamReader input, SourceFile file, ArrayList defs)\r
 363                 {\r
 364                         this.ref_name = file;\r
 365                         this.file_name = file;\r
 366                         reader = input;\r
 367                         \r
 368                         putback_char = -1;\r
 369 \r
 370                         if (defs != null){\r
 371                                 defines = new Hashtable ();\r
 372                                 foreach (string def in defs)\r
 373                                         define (def);\r
 374                         }\r
 375 \r
 376                         //\r
 377                         // FIXME: This could be `Location.Push' but we have to\r
 378                         // find out why the MS compiler allows this\r
 379                         //\r
 380                         Mono.CSharp.Location.Push (file);\r
 381                 }\r
 382 \r
 383                 public static void Cleanup () {\r
 384                         identifiers = null;\r
 385                 }\r
 386 \r
 387                 bool is_identifier_start_character (char c)\r
 388                 {\r
 389                         return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || c == '_' || Char.IsLetter (c);\r
 390                 }\r
 391 \r
 392                 bool is_identifier_part_character (char c)\r
 393                 {\r
 394                         return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '_' || (c >= '0' && c <= '9') || Char.IsLetter (c);\r
 395                 }\r
 396 \r
 397                 bool parse_less_than ()\r
 398                 {\r
 399                 start:\r
 400                         int the_token = token ();\r
 401                         switch (the_token) {\r
 402                         case Token.IDENTIFIER:\r
 403                         case Token.OBJECT:\r
 404                         case Token.STRING:\r
 405                         case Token.BOOL:\r
 406                         case Token.DECIMAL:\r
 407                         case Token.FLOAT:\r
 408                         case Token.DOUBLE:\r
 409                         case Token.SBYTE:\r
 410                         case Token.BYTE:\r
 411                         case Token.SHORT:\r
 412                         case Token.USHORT:\r
 413                         case Token.INT:\r
 414                         case Token.UINT:\r
 415                         case Token.LONG:\r
 416                         case Token.ULONG:\r
 417                         case Token.CHAR:\r
 418                         case Token.VOID:\r
 419                                 break;\r
 420 \r
 421                         default:\r
 422                                 return false;\r
 423                         }\r
 424                 again:\r
 425                         the_token = token ();\r
 426 \r
 427                         if (the_token == Token.OP_GENERICS_GT)\r
 428                                 return true;\r
 429                         else if (the_token == Token.COMMA)\r
 430                                 goto start;\r
 431                         else if (the_token == Token.OP_GENERICS_LT) {\r
 432                                 if (!parse_less_than ())\r
 433                                         return false;\r
 434                                 goto again;\r
 435                         }\r
 436 \r
 437                         return false;\r
 438                 }\r
 439 \r
 440                 bool parsing_less_than = false;\r
 441                 int parsing_generic_less_than = 0;\r
 442 \r
 443                 int is_punct (char c, ref bool doread)\r
 444                 {\r
 445                         int d;\r
 446                         int t;\r
 447 \r
 448                         doread = false;\r
 449 \r
 450                         switch (c){\r
 451                         case '{':\r
 452                                 return Token.OPEN_BRACE;\r
 453                         case '}':\r
 454                                 return Token.CLOSE_BRACE;\r
 455                         case '[':\r
 456                                 return Token.OPEN_BRACKET;\r
 457                         case ']':\r
 458                                 return Token.CLOSE_BRACKET;\r
 459                         case '(':\r
 460                                 return Token.OPEN_PARENS;\r
 461                         case ')': {\r
 462                                 if (deambiguate_close_parens == 0)\r
 463                                         return Token.CLOSE_PARENS;\r
 464 \r
 465                                 --deambiguate_close_parens;\r
 466 \r
 467                                 // Save current position and parse next token.\r
 468                                 int old = reader.Position;\r
 469                                 int new_token = token ();\r
 470                                 reader.Position = old;\r
 471                                 putback_char = -1;\r
 472 \r
 473                                 if (new_token == Token.OPEN_PARENS)\r
 474                                         return Token.CLOSE_PARENS_OPEN_PARENS;\r
 475                                 else if (new_token == Token.MINUS)\r
 476                                         return Token.CLOSE_PARENS_MINUS;\r
 477                                 else if (IsCastToken (new_token))\r
 478                                         return Token.CLOSE_PARENS_CAST;\r
 479                                 else\r
 480                                         return Token.CLOSE_PARENS_NO_CAST;\r
 481                         }\r
 482 \r
 483                         case ',':\r
 484                                 return Token.COMMA;\r
 485                         case ':':\r
 486                                 return Token.COLON;\r
 487                         case ';':\r
 488                                 return Token.SEMICOLON;\r
 489                         case '~':\r
 490                                 return Token.TILDE;\r
 491                         case '?':\r
 492                                 return Token.INTERR;\r
 493                         }\r
 494 \r
 495                         if (c == '<') {\r
 496                                 if (parsing_generic_less_than++ > 0)\r
 497                                         return Token.OP_GENERICS_LT;\r
 498 \r
 499                                 // Save current position and parse next token.\r
 500                                 int old = reader.Position;\r
 501                                 bool is_generic_lt = parse_less_than ();\r
 502                                 reader.Position = old;\r
 503                                 putback_char = -1;\r
 504 \r
 505                                 if (is_generic_lt) {\r
 506                                         parsing_generic_less_than++;\r
 507                                         return Token.OP_GENERICS_LT;\r
 508                                 } else\r
 509                                         parsing_generic_less_than = 0;\r
 510 \r
 511                                 d = peekChar ();\r
 512                                 if (d == '<'){\r
 513                                         getChar ();\r
 514                                         d = peekChar ();\r
 515 \r
 516                                         if (d == '='){\r
 517                                                 doread = true;\r
 518                                                 return Token.OP_SHIFT_LEFT_ASSIGN;\r
 519                                         }\r
 520                                         return Token.OP_SHIFT_LEFT;\r
 521                                 } else if (d == '='){\r
 522                                         doread = true;\r
 523                                         return Token.OP_LE;\r
 524                                 }\r
 525                                 return Token.OP_LT;\r
 526                         } else if (c == '>') {\r
 527                                 if (parsing_generic_less_than > 0) {\r
 528                                         parsing_generic_less_than--;\r
 529                                         return Token.OP_GENERICS_GT;\r
 530                                 }\r
 531 \r
 532                                 d = peekChar ();\r
 533                                 if (d == '>'){\r
 534                                         getChar ();\r
 535                                         d = peekChar ();\r
 536 \r
 537                                         if (d == '='){\r
 538                                                 doread = true;\r
 539                                                 return Token.OP_SHIFT_RIGHT_ASSIGN;\r
 540                                         }\r
 541                                         return Token.OP_SHIFT_RIGHT;\r
 542                                 } else if (d == '='){\r
 543                                         doread = true;\r
 544                                         return Token.OP_GE;\r
 545                                 }\r
 546                                 return Token.OP_GT;\r
 547                         }\r
 548 \r
 549                         d = peekChar ();\r
 550                         if (c == '+'){\r
 551                                 \r
 552                                 if (d == '+')\r
 553                                         t = Token.OP_INC;\r
 554                                 else if (d == '=')\r
 555                                         t = Token.OP_ADD_ASSIGN;\r
 556                                 else\r
 557                                         return Token.PLUS;\r
 558                                 doread = true;\r
 559                                 return t;\r
 560                         }\r
 561                         if (c == '-'){\r
 562                                 if (d == '-')\r
 563                                         t = Token.OP_DEC;\r
 564                                 else if (d == '=')\r
 565                                         t = Token.OP_SUB_ASSIGN;\r
 566                                 else if (d == '>')\r
 567                                         t = Token.OP_PTR;\r
 568                                 else\r
 569                                         return Token.MINUS;\r
 570                                 doread = true;\r
 571                                 return t;\r
 572                         }\r
 573 \r
 574                         if (c == '!'){\r
 575                                 if (d == '='){\r
 576                                         doread = true;\r
 577                                         return Token.OP_NE;\r
 578                                 }\r
 579                                 return Token.BANG;\r
 580                         }\r
 581 \r
 582                         if (c == '='){\r
 583                                 if (d == '='){\r
 584                                         doread = true;\r
 585                                         return Token.OP_EQ;\r
 586                                 }\r
 587                                 return Token.ASSIGN;\r
 588                         }\r
 589 \r
 590                         if (c == '&'){\r
 591                                 if (d == '&'){\r
 592                                         doread = true;\r
 593                                         return Token.OP_AND;\r
 594                                 } else if (d == '='){\r
 595                                         doread = true;\r
 596                                         return Token.OP_AND_ASSIGN;\r
 597                                 }\r
 598                                 return Token.BITWISE_AND;\r
 599                         }\r
 600 \r
 601                         if (c == '|'){\r
 602                                 if (d == '|'){\r
 603                                         doread = true;\r
 604                                         return Token.OP_OR;\r
 605                                 } else if (d == '='){\r
 606                                         doread = true;\r
 607                                         return Token.OP_OR_ASSIGN;\r
 608                                 }\r
 609                                 return Token.BITWISE_OR;\r
 610                         }\r
 611 \r
 612                         if (c == '*'){\r
 613                                 if (d == '='){\r
 614                                         doread = true;\r
 615                                         return Token.OP_MULT_ASSIGN;\r
 616                                 }\r
 617                                 return Token.STAR;\r
 618                         }\r
 619 \r
 620                         if (c == '/'){\r
 621                                 if (d == '='){\r
 622                                         doread = true;\r
 623                                         return Token.OP_DIV_ASSIGN;\r
 624                                 }\r
 625                                 return Token.DIV;\r
 626                         }\r
 627 \r
 628                         if (c == '%'){\r
 629                                 if (d == '='){\r
 630                                         doread = true;\r
 631                                         return Token.OP_MOD_ASSIGN;\r
 632                                 }\r
 633                                 return Token.PERCENT;\r
 634                         }\r
 635 \r
 636                         if (c == '^'){\r
 637                                 if (d == '='){\r
 638                                         doread = true;\r
 639                                         return Token.OP_XOR_ASSIGN;\r
 640                                 }\r
 641                                 return Token.CARRET;\r
 642                         }\r
 643 \r
 644                         return Token.ERROR;\r
 645                 }\r
 646 \r
 647                 int deambiguate_close_parens = 0;\r
 648 \r
 649                 public void Deambiguate_CloseParens ()\r
 650                 {\r
 651                         putback (')');\r
 652                         deambiguate_close_parens++;\r
 653                 }\r
 654 \r
 655                 void Error_NumericConstantTooLong ()\r
 656                 {\r
 657                         Report.Error (1021, Location, "Numeric constant too long");                     \r
 658                 }\r
 659                 \r
 660                 bool decimal_digits (int c)\r
 661                 {\r
 662                         int d;\r
 663                         bool seen_digits = false;\r
 664                         \r
 665                         if (c != -1){\r
 666                                 if (number_pos == max_number_size)\r
 667                                         Error_NumericConstantTooLong ();\r
 668                                 number_builder [number_pos++] = (char) c;\r
 669                         }\r
 670                         \r
 671                         //\r
 672                         // We use peekChar2, because decimal_digits needs to do a \r
 673                         // 2-character look-ahead (5.ToString for example).\r
 674                         //\r
 675                         while ((d = peekChar2 ()) != -1){\r
 676                                 if (d >= '0' && d <= '9'){\r
 677                                         if (number_pos == max_number_size)\r
 678                                                 Error_NumericConstantTooLong ();\r
 679                                         number_builder [number_pos++] = (char) d;\r
 680                                         getChar ();\r
 681                                         seen_digits = true;\r
 682                                 } else\r
 683                                         break;\r
 684                         }\r
 685                         \r
 686                         return seen_digits;\r
 687                 }\r
 688 \r
 689                 bool is_hex (int e)\r
 690                 {\r
 691                         return (e >= '0' && e <= '9') || (e >= 'A' && e <= 'F') || (e >= 'a' && e <= 'f');\r
 692                 }\r
 693                 \r
 694                 void hex_digits (int c)\r
 695                 {\r
 696                         if (c != -1)\r
 697                                 number_builder [number_pos++] = (char) c;\r
 698                         \r
 699                 }\r
 700                 \r
 701                 int real_type_suffix (int c)\r
 702                 {\r
 703                         int t;\r
 704 \r
 705                         switch (c){\r
 706                         case 'F': case 'f':\r
 707                                 t =  Token.LITERAL_FLOAT;\r
 708                                 break;\r
 709                         case 'D': case 'd':\r
 710                                 t = Token.LITERAL_DOUBLE;\r
 711                                 break;\r
 712                         case 'M': case 'm':\r
 713                                  t= Token.LITERAL_DECIMAL;\r
 714                                 break;\r
 715                         default:\r
 716                                 return Token.NONE;\r
 717                         }\r
 718                         return t;\r
 719                 }\r
 720 \r
 721                 int integer_type_suffix (ulong ul, int c)\r
 722                 {\r
 723                         bool is_unsigned = false;\r
 724                         bool is_long = false;\r
 725 \r
 726                         if (c != -1){\r
 727                                 bool scanning = true;\r
 728                                 do {\r
 729                                         switch (c){\r
 730                                         case 'U': case 'u':\r
 731                                                 if (is_unsigned)\r
 732                                                         scanning = false;\r
 733                                                 is_unsigned = true;\r
 734                                                 getChar ();\r
 735                                                 break;\r
 736 \r
 737                                         case 'l':\r
 738                                                 if (!is_unsigned){\r
 739                                                         //\r
 740                                                         // if we have not seen anything in between\r
 741                                                         // report this error\r
 742                                                         //\r
 743                                                         Report.Warning (\r
 744                                                                 78, Location,\r
 745                                                         "the 'l' suffix is easily confused with digit `1'," +\r
 746                                                         " use 'L' for clarity");\r
 747                                                 }\r
 748                                                 goto case 'L';\r
 749                                                 \r
 750                                         case 'L': \r
 751                                                 if (is_long)\r
 752                                                         scanning = false;\r
 753                                                 is_long = true;\r
 754                                                 getChar ();\r
 755                                                 break;\r
 756                                                 \r
 757                                         default:\r
 758                                                 scanning = false;\r
 759                                                 break;\r
 760                                         }\r
 761                                         c = peekChar ();\r
 762                                 } while (scanning);\r
 763                         }\r
 764 \r
 765                         if (is_long && is_unsigned){\r
 766                                 val = ul;\r
 767                                 return Token.LITERAL_INTEGER;\r
 768                         } else if (is_unsigned){\r
 769                                 // uint if possible, or ulong else.\r
 770 \r
 771                                 if ((ul & 0xffffffff00000000) == 0)\r
 772                                         val = (uint) ul;\r
 773                                 else\r
 774                                         val = ul;\r
 775                         } else if (is_long){\r
 776                                 // long if possible, ulong otherwise\r
 777                                 if ((ul & 0x8000000000000000) != 0)\r
 778                                         val = ul;\r
 779                                 else\r
 780                                         val = (long) ul;\r
 781                         } else {\r
 782                                 // int, uint, long or ulong in that order\r
 783                                 if ((ul & 0xffffffff00000000) == 0){\r
 784                                         uint ui = (uint) ul;\r
 785                                         \r
 786                                         if ((ui & 0x80000000) != 0)\r
 787                                                 val = ui;\r
 788                                         else\r
 789                                                 val = (int) ui;\r
 790                                 } else {\r
 791                                         if ((ul & 0x8000000000000000) != 0)\r
 792                                                 val = ul;\r
 793                                         else\r
 794                                                 val = (long) ul;\r
 795                                 }\r
 796                         }\r
 797                         return Token.LITERAL_INTEGER;\r
 798                 }\r
 799                                 \r
 800                 //\r
 801                 // given `c' as the next char in the input decide whether\r
 802                 // we need to convert to a special type, and then choose\r
 803                 // the best representation for the integer\r
 804                 //\r
 805                 int adjust_int (int c)\r
 806                 {\r
 807                         try {\r
 808                                 if (number_pos > 9){\r
 809                                         ulong ul = (uint) (number_builder [0] - '0');\r
 810 \r
 811                                         for (int i = 1; i < number_pos; i++){\r
 812                                                 ul = checked ((ul * 10) + ((uint)(number_builder [i] - '0')));\r
 813                                         }\r
 814                                         return integer_type_suffix (ul, c);\r
 815                                 } else {\r
 816                                         uint ui = (uint) (number_builder [0] - '0');\r
 817 \r
 818                                         for (int i = 1; i < number_pos; i++){\r
 819                                                 ui = checked ((ui * 10) + ((uint)(number_builder [i] - '0')));\r
 820                                         }\r
 821                                         return integer_type_suffix (ui, c);\r
 822                                 }\r
 823                         } catch (OverflowException) {\r
 824                                 error_details = "Integral constant is too large";\r
 825                                 Report.Error (1021, Location, error_details);\r
 826                                 val = 0ul;\r
 827                                 return Token.LITERAL_INTEGER;\r
 828                         }\r
 829                 }\r
 830                 \r
 831                 int adjust_real (int t)\r
 832                 {\r
 833                         string s = new String (number_builder, 0, number_pos);\r
 834 \r
 835                         switch (t){\r
 836                         case Token.LITERAL_DECIMAL:\r
 837                                 try {\r
 838                                         val = System.Decimal.Parse (s, styles, csharp_format_info);\r
 839                                 } catch (OverflowException) {\r
 840                                         val = 0m;     \r
 841                                         error_details = "Floating-point constant is outside the range of the type 'decimal'";\r
 842                                         Report.Error (594, Location, error_details);\r
 843                                 }\r
 844                                 break;\r
 845                         case Token.LITERAL_FLOAT:\r
 846                                 try {\r
 847                                         val = (float) System.Double.Parse (s, styles, csharp_format_info);\r
 848                                 } catch (OverflowException) {\r
 849                                         val = 0.0f;     \r
 850                                         error_details = "Floating-point constant is outside the range of the type 'float'";\r
 851                                         Report.Error (594, Location, error_details);\r
 852                                 }\r
 853                                 break;\r
 854                                 \r
 855                         case Token.LITERAL_DOUBLE:\r
 856                         case Token.NONE:\r
 857                                 t = Token.LITERAL_DOUBLE;\r
 858                                 try {\r
 859                                         val = System.Double.Parse (s, styles, csharp_format_info);\r
 860                                 } catch (OverflowException) {\r
 861                                         val = 0.0;     \r
 862                                         error_details = "Floating-point constant is outside the range of the type 'double'";\r
 863                                         Report.Error (594, Location, error_details);\r
 864                                 }\r
 865                                 break;\r
 866                         }\r
 867                         return t;\r
 868                 }\r
 869 \r
 870                 int handle_hex ()\r
 871                 {\r
 872                         int d;\r
 873                         ulong ul;\r
 874                         \r
 875                         getChar ();\r
 876                         while ((d = peekChar ()) != -1){\r
 877                                 if (is_hex (d)){\r
 878                                         number_builder [number_pos++] = (char) d;\r
 879                                         getChar ();\r
 880                                 } else\r
 881                                         break;\r
 882                         }\r
 883                         \r
 884                         string s = new String (number_builder, 0, number_pos);\r
 885                         try {\r
 886                                 if (number_pos <= 8)\r
 887                                         ul = System.UInt32.Parse (s, NumberStyles.HexNumber);\r
 888                                 else\r
 889                                         ul = System.UInt64.Parse (s, NumberStyles.HexNumber);\r
 890                         } catch (OverflowException){\r
 891                                 error_details = "Integral constant is too large";\r
 892                                 Report.Error (1021, Location, error_details);\r
 893                                 val = 0ul;\r
 894                                 return Token.LITERAL_INTEGER;\r
 895                         }\r
 896                         \r
 897                         return integer_type_suffix (ul, peekChar ());\r
 898                 }\r
 899 \r
 900                 //\r
 901                 // Invoked if we know we have .digits or digits\r
 902                 //\r
 903                 int is_number (int c)\r
 904                 {\r
 905                         bool is_real = false;\r
 906                         int type;\r
 907 \r
 908                         number_pos = 0;\r
 909 \r
 910                         if (c >= '0' && c <= '9'){\r
 911                                 if (c == '0'){\r
 912                                         int peek = peekChar ();\r
 913 \r
 914                                         if (peek == 'x' || peek == 'X')\r
 915                                                 return handle_hex ();\r
 916                                 }\r
 917                                 decimal_digits (c);\r
 918                                 c = getChar ();\r
 919                         }\r
 920 \r
 921                         //\r
 922                         // We need to handle the case of\r
 923                         // "1.1" vs "1.string" (LITERAL_FLOAT vs NUMBER DOT IDENTIFIER)\r
 924                         //\r
 925                         if (c == '.'){\r
 926                                 if (decimal_digits ('.')){\r
 927                                         is_real = true;\r
 928                                         c = getChar ();\r
 929                                 } else {\r
 930                                         putback ('.');\r
 931                                         number_pos--;\r
 932                                         return adjust_int (-1);\r
 933                                 }\r
 934                         }\r
 935                         \r
 936                         if (c == 'e' || c == 'E'){\r
 937                                 is_real = true;\r
 938                                 if (number_pos == max_number_size)\r
 939                                         Error_NumericConstantTooLong ();\r
 940                                 number_builder [number_pos++] = 'e';\r
 941                                 c = getChar ();\r
 942                                 \r
 943                                 if (c == '+'){\r
 944                                         if (number_pos == max_number_size)\r
 945                                                 Error_NumericConstantTooLong ();\r
 946                                         number_builder [number_pos++] = '+';\r
 947                                         c = -1;\r
 948                                 } else if (c == '-') {\r
 949                                         if (number_pos == max_number_size)\r
 950                                                 Error_NumericConstantTooLong ();\r
 951                                         number_builder [number_pos++] = '-';\r
 952                                         c = -1;\r
 953                                 } else {\r
 954                                         if (number_pos == max_number_size)\r
 955                                                 Error_NumericConstantTooLong ();\r
 956                                         number_builder [number_pos++] = '+';\r
 957                                 }\r
 958                                         \r
 959                                 decimal_digits (c);\r
 960                                 c = getChar ();\r
 961                         }\r
 962 \r
 963                         type = real_type_suffix (c);\r
 964                         if (type == Token.NONE && !is_real){\r
 965                                 putback (c);\r
 966                                 return adjust_int (c);\r
 967                         } else \r
 968                                 is_real = true;\r
 969 \r
 970                         if (type == Token.NONE){\r
 971                                 putback (c);\r
 972                         }\r
 973                         \r
 974                         if (is_real)\r
 975                                 return adjust_real (type);\r
 976 \r
 977                         Console.WriteLine ("This should not be reached");\r
 978                         throw new Exception ("Is Number should never reach this point");\r
 979                 }\r
 980 \r
 981                 //\r
 982                 // Accepts exactly count (4 or 8) hex, no more no less\r
 983                 //\r
 984                 int getHex (int count, out bool error)\r
 985                 {\r
 986                         int i;\r
 987                         int total = 0;\r
 988                         int c;\r
 989                         int top = count != -1 ? count : 4;\r
 990                         \r
 991                         getChar ();\r
 992                         error = false;\r
 993                         for (i = 0; i < top; i++){\r
 994                                 c = getChar ();\r
 995                                 \r
 996                                 if (c >= '0' && c <= '9')\r
 997                                         c = (int) c - (int) '0';\r
 998                                 else if (c >= 'A' && c <= 'F')\r
 999                                         c = (int) c - (int) 'A' + 10;\r
1000                                 else if (c >= 'a' && c <= 'f')\r
1001                                         c = (int) c - (int) 'a' + 10;\r
1002                                 else {\r
1003                                         error = true;\r
1004                                         return 0;\r
1005                                 }\r
1006                                 \r
1007                                 total = (total * 16) + c;\r
1008                                 if (count == -1){\r
1009                                         int p = peekChar ();\r
1010                                         if (p == -1)\r
1011                                                 break;\r
1012                                         if (!is_hex ((char)p))\r
1013                                                 break;\r
1014                                 }\r
1015                         }\r
1016                         return total;\r
1017                 }\r
1018 \r
1019                 int escape (int c)\r
1020                 {\r
1021                         bool error;\r
1022                         int d;\r
1023                         int v;\r
1024 \r
1025                         d = peekChar ();\r
1026                         if (c != '\\')\r
1027                                 return c;\r
1028                         \r
1029                         switch (d){\r
1030                         case 'a':\r
1031                                 v = '\a'; break;\r
1032                         case 'b':\r
1033                                 v = '\b'; break;\r
1034                         case 'n':\r
1035                                 v = '\n'; break;\r
1036                         case 't':\r
1037                                 v = '\t'; break;\r
1038                         case 'v':\r
1039                                 v = '\v'; break;\r
1040                         case 'r':\r
1041                                 v = '\r'; break;\r
1042                         case '\\':\r
1043                                 v = '\\'; break;\r
1044                         case 'f':\r
1045                                 v = '\f'; break;\r
1046                         case '0':\r
1047                                 v = 0; break;\r
1048                         case '"':\r
1049                                 v = '"'; break;\r
1050                         case '\'':\r
1051                                 v = '\''; break;\r
1052                         case 'x':\r
1053                                 v = getHex (-1, out error);\r
1054                                 if (error)\r
1055                                         goto default;\r
1056                                 return v;\r
1057                         case 'u':\r
1058                                 v = getHex (4, out error);\r
1059                                 if (error)\r
1060                                         goto default;\r
1061                                 return v;\r
1062                         case 'U':\r
1063                                 v = getHex (8, out error);\r
1064                                 if (error)\r
1065                                         goto default;\r
1066                                 return v;\r
1067                         default:\r
1068                                 Report.Error (1009, Location, "Unrecognized escape sequence in " + (char)d);\r
1069                                 return d;\r
1070                         }\r
1071                         getChar ();\r
1072                         return v;\r
1073                 }\r
1074 \r
1075                 int getChar ()\r
1076                 {\r
1077                         if (putback_char != -1){\r
1078                                 int x = putback_char;\r
1079                                 putback_char = -1;\r
1080 \r
1081                                 return x;\r
1082                         }\r
1083                         return reader.Read ();\r
1084                 }\r
1085 \r
1086                 int peekChar ()\r
1087                 {\r
1088                         if (putback_char != -1)\r
1089                                 return putback_char;\r
1090                         putback_char = reader.Read ();\r
1091                         return putback_char;\r
1092                 }\r
1093 \r
1094                 int peekChar2 ()\r
1095                 {\r
1096                         if (putback_char != -1)\r
1097                                 return putback_char;\r
1098                         return reader.Peek ();\r
1099                 }\r
1100                 \r
1101                 void putback (int c)\r
1102                 {\r
1103                         if (putback_char != -1){\r
1104                                 Console.WriteLine ("Col: " + col);\r
1105                                 Console.WriteLine ("Row: " + line);\r
1106                                 Console.WriteLine ("Name: " + ref_name.Name);\r
1107                                 Console.WriteLine ("Current [{0}] putting back [{1}]  ", putback_char, c);\r
1108                                 throw new Exception ("This should not happen putback on putback");\r
1109                         }\r
1110                         putback_char = c;\r
1111                 }\r
1112 \r
1113                 public bool advance ()\r
1114                 {\r
1115                         return peekChar () != -1;\r
1116                 }\r
1117 \r
1118                 public Object Value {\r
1119                         get {\r
1120                                 return val;\r
1121                         }\r
1122                 }\r
1123 \r
1124                 public Object value ()\r
1125                 {\r
1126                         return val;\r
1127                 }\r
1128 \r
1129                 bool IsCastToken (int token)\r
1130                 {\r
1131                         switch (token) {\r
1132                         case Token.BANG:\r
1133                         case Token.TILDE:\r
1134                         case Token.IDENTIFIER:\r
1135                         case Token.LITERAL_INTEGER:\r
1136                         case Token.LITERAL_FLOAT:\r
1137                         case Token.LITERAL_DOUBLE:\r
1138                         case Token.LITERAL_DECIMAL:\r
1139                         case Token.LITERAL_CHARACTER:\r
1140                         case Token.LITERAL_STRING:\r
1141                         case Token.BASE:\r
1142                         case Token.CHECKED:\r
1143                         case Token.FALSE:\r
1144                         case Token.FIXED:\r
1145                         case Token.NEW:\r
1146                         case Token.NULL:\r
1147                         case Token.SIZEOF:\r
1148                         case Token.THIS:\r
1149                         case Token.THROW:\r
1150                         case Token.TRUE:\r
1151                         case Token.TYPEOF:\r
1152                         case Token.UNCHECKED:\r
1153                         case Token.UNSAFE:\r
1154 \r
1155                                 //\r
1156                                 // These can be part of a member access\r
1157                                 //\r
1158                         case Token.INT:\r
1159                         case Token.UINT:\r
1160                         case Token.SHORT:\r
1161                         case Token.USHORT:\r
1162                         case Token.LONG:\r
1163                         case Token.ULONG:\r
1164                         case Token.DOUBLE:\r
1165                         case Token.FLOAT:\r
1166                         case Token.CHAR:\r
1167                                 return true;\r
1168 \r
1169                         default:\r
1170                                 return false;\r
1171                         }\r
1172                 }\r
1173 \r
1174                 public int token ()\r
1175                 {\r
1176                         current_token = xtoken ();\r
1177 \r
1178                         if (current_token != Token.DEFAULT)\r
1179                                 return current_token;\r
1180 \r
1181                         int c = consume_whitespace ();\r
1182                         if (c == -1)\r
1183                                 current_token = Token.ERROR;\r
1184                         else if (c == '(')\r
1185                                 current_token = Token.DEFAULT_OPEN_PARENS;\r
1186                         else\r
1187                                 putback (c);\r
1188 \r
1189                         return current_token;\r
1190                 }\r
1191 \r
1192                 static StringBuilder static_cmd_arg = new System.Text.StringBuilder ();\r
1193                 \r
1194                 void get_cmd_arg (out string cmd, out string arg)\r
1195                 {\r
1196                         int c;\r
1197                         \r
1198                         tokens_seen = false;\r
1199                         arg = "";\r
1200                         static_cmd_arg.Length = 0;\r
1201 \r
1202                         // skip over white space\r
1203                         while ((c = getChar ()) != -1 && (c != '\n') && ((c == '\r') || (c == ' ') || (c == '\t')))\r
1204                                 ;\r
1205                                 \r
1206                         while ((c != -1) && (c != '\n') && (c != ' ') && (c != '\t') && (c != '\r')){\r
1207                                 static_cmd_arg.Append ((char) c);\r
1208                                 c = getChar ();\r
1209                         }\r
1210 \r
1211                         cmd = static_cmd_arg.ToString ();\r
1212 \r
1213                         if (c == '\n'){\r
1214                                 line++;\r
1215                                 ref_line++;\r
1216                                 return;\r
1217                         } else if (c == '\r')\r
1218                                 col = 0;\r
1219 \r
1220                         // skip over white space\r
1221                         while ((c = getChar ()) != -1 && (c != '\n') && ((c == '\r') || (c == ' ') || (c == '\t')))\r
1222                                 ;\r
1223 \r
1224                         if (c == '\n'){\r
1225                                 line++;\r
1226                                 ref_line++;\r
1227                                 return;\r
1228                         } else if (c == '\r'){\r
1229                                 col = 0;\r
1230                                 return;\r
1231                         }\r
1232                         \r
1233                         static_cmd_arg.Length = 0;\r
1234                         static_cmd_arg.Append ((char) c);\r
1235                         \r
1236                         while ((c = getChar ()) != -1 && (c != '\n') && (c != '\r')){\r
1237                                 static_cmd_arg.Append ((char) c);\r
1238                         }\r
1239 \r
1240                         if (c == '\n'){\r
1241                                 line++;\r
1242                                 ref_line++;\r
1243                         } else if (c == '\r')\r
1244                                 col = 0;\r
1245                         arg = static_cmd_arg.ToString ().Trim ();\r
1246                 }\r
1247 \r
1248                 //\r
1249                 // Handles the #line directive\r
1250                 //\r
1251                 bool PreProcessLine (string arg)\r
1252                 {\r
1253                         if (arg == "")\r
1254                                 return false;\r
1255 \r
1256                         if (arg == "default"){\r
1257                                 ref_line = line;\r
1258                                 ref_name = file_name;\r
1259                                 Location.Push (ref_name);\r
1260                                 return true;\r
1261                         } else if (arg == "hidden"){\r
1262                                 //\r
1263                                 // We ignore #line hidden\r
1264                                 //\r
1265                                 return true;\r
1266                         }\r
1267                         \r
1268                         try {\r
1269                                 int pos;\r
1270 \r
1271                                 if ((pos = arg.IndexOf (' ')) != -1 && pos != 0){\r
1272                                         ref_line = System.Int32.Parse (arg.Substring (0, pos));\r
1273                                         pos++;\r
1274                                         \r
1275                                         char [] quotes = { '\"' };\r
1276                                         \r
1277                                         string name = arg.Substring (pos). Trim (quotes);\r
1278                                         ref_name = Location.LookupFile (name);\r
1279                                         file_name.HasLineDirective = true;\r
1280                                         ref_name.HasLineDirective = true;\r
1281                                         Location.Push (ref_name);\r
1282                                 } else {\r
1283                                         ref_line = System.Int32.Parse (arg);\r
1284                                 }\r
1285                         } catch {\r
1286                                 return false;\r
1287                         }\r
1288                         \r
1289                         return true;\r
1290                 }\r
1291 \r
1292                 //\r
1293                 // Handles #define and #undef\r
1294                 //\r
1295                 void PreProcessDefinition (bool is_define, string arg)\r
1296                 {\r
1297                         if (arg == "" || arg == "true" || arg == "false"){\r
1298                                 Report.Error (1001, Location, "Missing identifer to pre-processor directive");\r
1299                                 return;\r
1300                         }\r
1301 \r
1302                         char[] whitespace = { ' ', '\t' };\r
1303                         if (arg.IndexOfAny (whitespace) != -1){\r
1304                                 Report.Error (1025, Location, "Single-line comment or end-of-line expected");\r
1305                                 return;\r
1306                         }\r
1307 \r
1308                         if (!is_identifier_start_character (arg [0]))\r
1309                                 Report.Error (1001, Location, "Identifier expected: " + arg);\r
1310                         \r
1311                         foreach (char c in arg.Substring (1)){\r
1312                                 if (!is_identifier_part_character (c)){\r
1313                                         Report.Error (1001, Location, "Identifier expected: " + arg);\r
1314                                         return;\r
1315                                 }\r
1316                         }\r
1317 \r
1318                         if (is_define){\r
1319                                 if (defines == null)\r
1320                                         defines = new Hashtable ();\r
1321                                 define (arg);\r
1322                         } else {\r
1323                                 if (defines == null)\r
1324                                         return;\r
1325                                 if (defines.Contains (arg))\r
1326                                         defines.Remove (arg);\r
1327                         }\r
1328                 }\r
1329 \r
1330                 bool eval_val (string s)\r
1331                 {\r
1332                         if (s == "true")\r
1333                                 return true;\r
1334                         if (s == "false")\r
1335                                 return false;\r
1336                         \r
1337                         if (defines == null)\r
1338                                 return false;\r
1339                         if (defines.Contains (s))\r
1340                                 return true;\r
1341 \r
1342                         return false;\r
1343                 }\r
1344 \r
1345                 bool pp_primary (ref string s)\r
1346                 {\r
1347                         s = s.Trim ();\r
1348                         int len = s.Length;\r
1349 \r
1350                         if (len > 0){\r
1351                                 char c = s [0];\r
1352                                 \r
1353                                 if (c == '('){\r
1354                                         s = s.Substring (1);\r
1355                                         bool val = pp_expr (ref s);\r
1356                                         if (s.Length > 0 && s [0] == ')'){\r
1357                                                 s = s.Substring (1);\r
1358                                                 return val;\r
1359                                         }\r
1360                                         Error_InvalidDirective ();\r
1361                                         return false;\r
1362                                 }\r
1363                                 \r
1364                                 if (is_identifier_start_character (c)){\r
1365                                         int j = 1;\r
1366 \r
1367                                         while (j < len){\r
1368                                                 c = s [j];\r
1369                                                 \r
1370                                                 if (is_identifier_part_character (c)){\r
1371                                                         j++;\r
1372                                                         continue;\r
1373                                                 }\r
1374                                                 bool v = eval_val (s.Substring (0, j));\r
1375                                                 s = s.Substring (j);\r
1376                                                 return v;\r
1377                                         }\r
1378                                         bool vv = eval_val (s);\r
1379                                         s = "";\r
1380                                         return vv;\r
1381                                 }\r
1382                         }\r
1383                         Error_InvalidDirective ();\r
1384                         return false;\r
1385                 }\r
1386                 \r
1387                 bool pp_unary (ref string s)\r
1388                 {\r
1389                         s = s.Trim ();\r
1390                         int len = s.Length;\r
1391 \r
1392                         if (len > 0){\r
1393                                 if (s [0] == '!'){\r
1394                                         if (len > 1 && s [1] == '='){\r
1395                                                 Error_InvalidDirective ();\r
1396                                                 return false;\r
1397                                         }\r
1398                                         s = s.Substring (1);\r
1399                                         return ! pp_primary (ref s);\r
1400                                 } else\r
1401                                         return pp_primary (ref s);\r
1402                         } else {\r
1403                                 Error_InvalidDirective ();\r
1404                                 return false;\r
1405                         }\r
1406                 }\r
1407                 \r
1408                 bool pp_eq (ref string s)\r
1409                 {\r
1410                         bool va = pp_unary (ref s);\r
1411 \r
1412                         s = s.Trim ();\r
1413                         int len = s.Length;\r
1414                         if (len > 0){\r
1415                                 if (s [0] == '='){\r
1416                                         if (len > 2 && s [1] == '='){\r
1417                                                 s = s.Substring (2);\r
1418                                                 return va == pp_unary (ref s);\r
1419                                         } else {\r
1420                                                 Error_InvalidDirective ();\r
1421                                                 return false;\r
1422                                         }\r
1423                                 } else if (s [0] == '!' && len > 1 && s [1] == '='){\r
1424                                         s = s.Substring (2);\r
1425 \r
1426                                         return va != pp_unary (ref s);\r
1427 \r
1428                                 } \r
1429                         }\r
1430 \r
1431                         return va;\r
1432                                 \r
1433                 }\r
1434                 \r
1435                 bool pp_and (ref string s)\r
1436                 {\r
1437                         bool va = pp_eq (ref s);\r
1438 \r
1439                         s = s.Trim ();\r
1440                         int len = s.Length;\r
1441                         if (len > 0){\r
1442                                 if (s [0] == '&'){\r
1443                                         if (len > 2 && s [1] == '&'){\r
1444                                                 s = s.Substring (2);\r
1445                                                 return (va & pp_eq (ref s));\r
1446                                         } else {\r
1447                                                 Error_InvalidDirective ();\r
1448                                                 return false;\r
1449                                         }\r
1450                                 } \r
1451                         }\r
1452                         return va;\r
1453                 }\r
1454                 \r
1455                 //\r
1456                 // Evaluates an expression for `#if' or `#elif'\r
1457                 //\r
1458                 bool pp_expr (ref string s)\r
1459                 {\r
1460                         bool va = pp_and (ref s);\r
1461                         s = s.Trim ();\r
1462                         int len = s.Length;\r
1463                         if (len > 0){\r
1464                                 char c = s [0];\r
1465                                 \r
1466                                 if (c == '|'){\r
1467                                         if (len > 2 && s [1] == '|'){\r
1468                                                 s = s.Substring (2);\r
1469                                                 return va | pp_expr (ref s);\r
1470                                         } else {\r
1471                                                 Error_InvalidDirective ();\r
1472                                                 return false;\r
1473                                         }\r
1474                                 } \r
1475                         }\r
1476                         \r
1477                         return va;\r
1478                 }\r
1479 \r
1480                 bool eval (string s)\r
1481                 {\r
1482                         bool v = pp_expr (ref s);\r
1483                         s = s.Trim ();\r
1484                         if (s.Length != 0){\r
1485                                 Error_InvalidDirective ();\r
1486                                 return false;\r
1487                         }\r
1488 \r
1489                         return v;\r
1490                 }\r
1491                 \r
1492                 void Error_InvalidDirective ()\r
1493                 {\r
1494                         Report.Error (1517, Location, "Invalid pre-processor directive");\r
1495                 }\r
1496 \r
1497                 void Error_UnexpectedDirective (string extra)\r
1498                 {\r
1499                         Report.Error (\r
1500                                 1028, Location,\r
1501                                 "Unexpected processor directive (" + extra + ")");\r
1502                 }\r
1503 \r
1504                 void Error_TokensSeen ()\r
1505                 {\r
1506                         Report.Error (\r
1507                                 1032, Location,\r
1508                                 "Cannot define or undefine pre-processor symbols after a token in the file");\r
1509                 }\r
1510                 \r
1511                 //\r
1512                 // if true, then the code continues processing the code\r
1513                 // if false, the code stays in a loop until another directive is\r
1514                 // reached.\r
1515                 //\r
1516                 bool handle_preprocessing_directive (bool caller_is_taking)\r
1517                 {\r
1518                         string cmd, arg;\r
1519                         bool region_directive = false;\r
1520 \r
1521                         get_cmd_arg (out cmd, out arg);\r
1522 \r
1523                         // Eat any trailing whitespaces and single-line comments\r
1524                         if (arg.IndexOf ("//") != -1)\r
1525                                 arg = arg.Substring (0, arg.IndexOf ("//"));\r
1526                         arg = arg.TrimEnd (' ', '\t');\r
1527 \r
1528                         //\r
1529                         // The first group of pre-processing instructions is always processed\r
1530                         //\r
1531                         switch (cmd){\r
1532                         case "pragma":\r
1533                                 if (RootContext.V2)\r
1534                                         return true;\r
1535                                 break;\r
1536                                 \r
1537                         case "line":\r
1538                                 if (!PreProcessLine (arg))\r
1539                                         Report.Error (\r
1540                                                 1576, Location,\r
1541                                                 "Argument to #line directive is missing or invalid");\r
1542                                 return true;\r
1543 \r
1544                         case "region":\r
1545                                 region_directive = true;\r
1546                                 arg = "true";\r
1547                                 goto case "if";\r
1548 \r
1549                         case "endregion":\r
1550                                 region_directive = true;\r
1551                                 goto case "endif";\r
1552                                 \r
1553                         case "if":\r
1554                                 if (arg == ""){\r
1555                                         Error_InvalidDirective ();\r
1556                                         return true;\r
1557                                 }\r
1558                                 bool taking = false;\r
1559                                 if (ifstack == null)\r
1560                                         ifstack = new Stack ();\r
1561 \r
1562                                 if (ifstack.Count == 0){\r
1563                                         taking = true;\r
1564                                 } else {\r
1565                                         int state = (int) ifstack.Peek ();\r
1566                                         if ((state & TAKING) != 0)\r
1567                                                 taking = true;\r
1568                                 }\r
1569 \r
1570                                 if (eval (arg) && taking){\r
1571                                         int push = TAKING | TAKEN_BEFORE | PARENT_TAKING;\r
1572                                         if (region_directive)\r
1573                                                 push |= REGION;\r
1574                                         ifstack.Push (push);\r
1575                                         return true;\r
1576                                 } else {\r
1577                                         int push = (taking ? PARENT_TAKING : 0);\r
1578                                         if (region_directive)\r
1579                                                 push |= REGION;\r
1580                                         ifstack.Push (push);\r
1581                                         return false;\r
1582                                 }\r
1583                                 \r
1584                         case "endif":\r
1585                                 if (ifstack == null || ifstack.Count == 0){\r
1586                                         Error_UnexpectedDirective ("no #if for this #endif");\r
1587                                         return true;\r
1588                                 } else {\r
1589                                         int pop = (int) ifstack.Pop ();\r
1590                                         \r
1591                                         if (region_directive && ((pop & REGION) == 0))\r
1592                                                 Report.Error (1027, Location, "#endif directive expected");\r
1593                                         else if (!region_directive && ((pop & REGION) != 0))\r
1594                                                 Report.Error (1038, Location, "#endregion directive expected");\r
1595                                         \r
1596                                         if (ifstack.Count == 0)\r
1597                                                 return true;\r
1598                                         else {\r
1599                                                 int state = (int) ifstack.Peek ();\r
1600 \r
1601                                                 if ((state & TAKING) != 0)\r
1602                                                         return true;\r
1603                                                 else\r
1604                                                         return false;\r
1605                                         }\r
1606                                 }\r
1607 \r
1608                         case "elif":\r
1609                                 if (ifstack == null || ifstack.Count == 0){\r
1610                                         Error_UnexpectedDirective ("no #if for this #elif");\r
1611                                         return true;\r
1612                                 } else {\r
1613                                         int state = (int) ifstack.Peek ();\r
1614 \r
1615                                         if ((state & REGION) != 0) {\r
1616                                                 Report.Error (1038, Location, "#endregion directive expected");\r
1617                                                 return true;\r
1618                                         }\r
1619 \r
1620                                         if ((state & ELSE_SEEN) != 0){\r
1621                                                 Error_UnexpectedDirective ("#elif not valid after #else");\r
1622                                                 return true;\r
1623                                         }\r
1624 \r
1625                                         if ((state & (TAKEN_BEFORE | TAKING)) != 0)\r
1626                                                 return false;\r
1627 \r
1628                                         if (eval (arg) && ((state & PARENT_TAKING) != 0)){\r
1629                                                 state = (int) ifstack.Pop ();\r
1630                                                 ifstack.Push (state | TAKING | TAKEN_BEFORE);\r
1631                                                 return true;\r
1632                                         } else \r
1633                                                 return false;\r
1634                                 }\r
1635 \r
1636                         case "else":\r
1637                                 if (ifstack == null || ifstack.Count == 0){\r
1638                                         Report.Error (\r
1639                                                 1028, Location,\r
1640                                                 "Unexpected processor directive (no #if for this #else)");\r
1641                                         return true;\r
1642                                 } else {\r
1643                                         int state = (int) ifstack.Peek ();\r
1644 \r
1645                                         if ((state & REGION) != 0) {\r
1646                                                 Report.Error (1038, Location, "#endregion directive expected");\r
1647                                                 return true;\r
1648                                         }\r
1649 \r
1650                                         if ((state & ELSE_SEEN) != 0){\r
1651                                                 Error_UnexpectedDirective ("#else within #else");\r
1652                                                 return true;\r
1653                                         }\r
1654 \r
1655                                         ifstack.Pop ();\r
1656 \r
1657                                         bool ret;\r
1658                                         if ((state & TAKEN_BEFORE) == 0){\r
1659                                                 ret = ((state & PARENT_TAKING) != 0);\r
1660                                         } else\r
1661                                                 ret = false;\r
1662                                         \r
1663                                         if (ret)\r
1664                                                 state |= TAKING;\r
1665                                         else\r
1666                                                 state &= ~TAKING;\r
1667                                         \r
1668                                         ifstack.Push (state | ELSE_SEEN);\r
1669                                         \r
1670                                         return ret;\r
1671                                 }\r
1672                         }\r
1673 \r
1674                         //\r
1675                         // These are only processed if we are in a `taking' block\r
1676                         //\r
1677                         if (!caller_is_taking)\r
1678                                 return false;\r
1679                                         \r
1680                         switch (cmd){\r
1681                         case "define":\r
1682                                 if (any_token_seen){\r
1683                                         Error_TokensSeen ();\r
1684                                         return true;\r
1685                                 }\r
1686                                 PreProcessDefinition (true, arg);\r
1687                                 return true;\r
1688 \r
1689                         case "undef":\r
1690                                 if (any_token_seen){\r
1691                                         Error_TokensSeen ();\r
1692                                         return true;\r
1693                                 }\r
1694                                 PreProcessDefinition (false, arg);\r
1695                                 return true;\r
1696 \r
1697                         case "error":\r
1698                                 Report.Error (1029, Location, "#error: '" + arg + "'");\r
1699                                 return true;\r
1700 \r
1701                         case "warning":\r
1702                                 Report.Warning (1030, Location, "#warning: '" + arg + "'");\r
1703                                 return true;\r
1704                         }\r
1705 \r
1706                         Report.Error (1024, Location, "Preprocessor directive expected (got: " + cmd + ")");\r
1707                         return true;\r
1708 \r
1709                 }\r
1710 \r
1711                 private int consume_string (bool quoted) \r
1712                 {\r
1713                         int c;\r
1714                         string_builder.Length = 0;\r
1715                                                                 \r
1716                         while ((c = getChar ()) != -1){\r
1717                                 if (c == '"'){\r
1718                                         if (quoted && peekChar () == '"'){\r
1719                                                 string_builder.Append ((char) c);\r
1720                                                 getChar ();\r
1721                                                 continue;\r
1722                                         } else {\r
1723                                                 val = string_builder.ToString ();\r
1724                                                 return Token.LITERAL_STRING;\r
1725                                         }\r
1726                                 }\r
1727 \r
1728                                 if (c == '\n'){\r
1729                                         if (!quoted)\r
1730                                                 Report.Error (1010, Location, "Newline in constant");\r
1731                                         line++;\r
1732                                         ref_line++;\r
1733                                         col = 0;\r
1734                                 } else\r
1735                                         col++;\r
1736 \r
1737                                 if (!quoted){\r
1738                                         c = escape (c);\r
1739                                         if (c == -1)\r
1740                                                 return Token.ERROR;\r
1741                                 }\r
1742                                 string_builder.Append ((char) c);\r
1743                         }\r
1744 \r
1745                         Report.Error (1039, Location, "Unterminated string literal");\r
1746                         return Token.EOF;\r
1747                 }\r
1748 \r
1749                 private int consume_identifier (int s, bool quoted) \r
1750                 {\r
1751                         int pos = 1;\r
1752                         int c;\r
1753                         \r
1754                         id_builder [0] = (char) s;\r
1755                                         \r
1756                         while ((c = reader.Read ()) != -1) {\r
1757                                 if (is_identifier_part_character ((char) c)){\r
1758                                         if (pos == max_id_size){\r
1759                                                 Report.Error (645, Location, "Identifier too long (limit is 512 chars)");\r
1760                                                 return Token.ERROR;\r
1761                                         }\r
1762                                         \r
1763                                         id_builder [pos++] = (char) c;\r
1764                                         putback_char = -1;\r
1765                                         col++;\r
1766                                 } else {\r
1767                                         putback_char = c;\r
1768                                         break;\r
1769                                 }\r
1770                         }\r
1771 \r
1772                         //\r
1773                         // Optimization: avoids doing the keyword lookup\r
1774                         // on uppercase letters and _\r
1775                         //\r
1776                         if (s >= 'a'){\r
1777                                 int keyword = GetKeyword (id_builder, pos);\r
1778                                 if (keyword != -1 && !quoted)\r
1779                                 return keyword;\r
1780                         }\r
1781 \r
1782                         //\r
1783                         // Keep identifiers in an array of hashtables to avoid needless\r
1784                         // allocations\r
1785                         //\r
1786 \r
1787                         if (identifiers [pos] != null) {\r
1788                                 val = identifiers [pos][id_builder];\r
1789                                 if (val != null) {\r
1790                                         return Token.IDENTIFIER;\r
1791                                 }\r
1792                         }\r
1793                         else\r
1794                                 identifiers [pos] = new CharArrayHashtable (pos);\r
1795 \r
1796                         val = new String (id_builder, 0, pos);\r
1797 \r
1798                         char [] chars = new char [pos];\r
1799                         Array.Copy (id_builder, chars, pos);\r
1800 \r
1801                         identifiers [pos] [chars] = val;\r
1802 \r
1803                         return Token.IDENTIFIER;\r
1804                 }\r
1805 \r
1806                 int consume_whitespace ()\r
1807                 {\r
1808                         int t;\r
1809                         bool doread = false;\r
1810                         int c;\r
1811 \r
1812                         val = null;\r
1813                         // optimization: eliminate col and implement #directive semantic correctly.\r
1814                         for (;(c = getChar ()) != -1; col++) {\r
1815                                 if (c == ' ')\r
1816                                         continue;\r
1817                                 \r
1818                                 if (c == '\t') {\r
1819                                         col = (((col + 8) / 8) * 8) - 1;\r
1820                                         continue;\r
1821                                 }\r
1822                                 \r
1823                                 if (c == ' ' || c == '\f' || c == '\v' || c == 0xa0)\r
1824                                         continue;\r
1825 \r
1826                                 if (c == '\r') {\r
1827                                         if (peekChar () == '\n')\r
1828                                                 getChar ();\r
1829 \r
1830                                         line++;\r
1831                                         ref_line++;\r
1832                                         col = 0;\r
1833                                         any_token_seen |= tokens_seen;\r
1834                                         tokens_seen = false;\r
1835                                         continue;\r
1836                                 }\r
1837 \r
1838                                 // Handle double-slash comments.\r
1839                                 if (c == '/'){\r
1840                                         int d = peekChar ();\r
1841                                 \r
1842                                         if (d == '/'){\r
1843                                                 getChar ();\r
1844                                                 while ((d = getChar ()) != -1 && (d != '\n') && d != '\r')\r
1845                                                         col++;\r
1846                                                 if (d == '\n'){\r
1847                                                         line++;\r
1848                                                         ref_line++;\r
1849                                                         col = 0;\r
1850                                                 }\r
1851                                                 any_token_seen |= tokens_seen;\r
1852                                                 tokens_seen = false;\r
1853                                                 continue;\r
1854                                         } else if (d == '*'){\r
1855                                                 getChar ();\r
1856 \r
1857                                                 while ((d = getChar ()) != -1){\r
1858                                                         if (d == '*' && peekChar () == '/'){\r
1859                                                                 getChar ();\r
1860                                                                 col++;\r
1861                                                                 break;\r
1862                                                         }\r
1863                                                         if (d == '\n'){\r
1864                                                                 line++;\r
1865                                                                 ref_line++;\r
1866                                                                 col = 0;\r
1867                                                                 any_token_seen |= tokens_seen;\r
1868                                                                 tokens_seen = false;\r
1869                                                         }\r
1870                                                 }\r
1871                                                 continue;\r
1872                                         }\r
1873                                         goto is_punct_label;\r
1874                                 }\r
1875 \r
1876                         is_punct_label:\r
1877                                 // white space\r
1878                                 if (c == '\n'){\r
1879                                         line++;\r
1880                                         ref_line++;\r
1881                                         col = 0;\r
1882                                         any_token_seen |= tokens_seen;\r
1883                                         tokens_seen = false;\r
1884                                         continue;\r
1885                                 }\r
1886 \r
1887                                 /* For now, ignore pre-processor commands */\r
1888                                 // FIXME: In C# the '#' is not limited to appear\r
1889                                 // on the first column.\r
1890                                 if (c == '#' && !tokens_seen){\r
1891                                         bool cont = true;\r
1892                                         \r
1893                                 start_again:\r
1894                                         \r
1895                                         cont = handle_preprocessing_directive (cont);\r
1896 \r
1897                                         if (cont){\r
1898                                                 col = 0;\r
1899                                                 continue;\r
1900                                         }\r
1901                                         col = 1;\r
1902 \r
1903                                         bool skipping = false;\r
1904                                         for (;(c = getChar ()) != -1; col++){\r
1905                                                 if (c == '\n'){\r
1906                                                         col = 0;\r
1907                                                         line++;\r
1908                                                         ref_line++;\r
1909                                                         skipping = false;\r
1910                                                 } else if (c == ' ' || c == '\t' || c == '\v' || c == '\r' || c == 0xa0)\r
1911                                                         continue;\r
1912                                                 else if (c != '#')\r
1913                                                         skipping = true;\r
1914                                                 if (c == '#' && !skipping)\r
1915                                                         goto start_again;\r
1916                                         }\r
1917                                         any_token_seen |= tokens_seen;\r
1918                                         tokens_seen = false;\r
1919                                         if (c == -1)\r
1920                                                 Report.Error (1027, Location, "#endif/#endregion expected");\r
1921                                         continue;\r
1922                                 }\r
1923 \r
1924                                 return c;\r
1925                         }\r
1926 \r
1927                         return -1;\r
1928                 }\r
1929                 \r
1930                 public int xtoken ()\r
1931                 {\r
1932                         int t;\r
1933                         bool doread = false;\r
1934                         int c;\r
1935 \r
1936                         val = null;\r
1937                         // optimization: eliminate col and implement #directive semantic correctly.\r
1938 \r
1939                         c = consume_whitespace ();\r
1940                         if (c == -1)\r
1941                                 return Token.EOF;\r
1942 \r
1943                         if (is_identifier_start_character ((char)c)){\r
1944                                 tokens_seen = true;\r
1945                                 return consume_identifier (c, false);\r
1946                         }\r
1947 \r
1948                 is_punct_label:\r
1949                         if ((t = is_punct ((char)c, ref doread)) != Token.ERROR){\r
1950                                 tokens_seen = true;\r
1951                                 if (doread){\r
1952                                         getChar ();\r
1953                                         col++;\r
1954                                 }\r
1955                                 return t;\r
1956                         }\r
1957 \r
1958                         if (c >= '0' && c <= '9'){\r
1959                                 tokens_seen = true;\r
1960                                 return is_number (c);\r
1961                         }\r
1962 \r
1963                         if (c == '.'){\r
1964                                 tokens_seen = true;\r
1965                                 int peek = peekChar ();\r
1966                                 if (peek >= '0' && peek <= '9')\r
1967                                         return is_number (c);\r
1968                                 return Token.DOT;\r
1969                         }\r
1970 \r
1971                         if (c == '"') \r
1972                                 return consume_string (false);\r
1973 \r
1974                         if (c == '\''){\r
1975                                 c = getChar ();\r
1976                                 tokens_seen = true;\r
1977                                 if (c == '\''){\r
1978                                         error_details = "Empty character literal";\r
1979                                         Report.Error (1011, Location, error_details);\r
1980                                         return Token.ERROR;\r
1981                                 }\r
1982                                 c = escape (c);\r
1983                                 if (c == -1)\r
1984                                         return Token.ERROR;\r
1985                                 val = new System.Char ();\r
1986                                 val = (char) c;\r
1987                                 c = getChar ();\r
1988 \r
1989                                 if (c != '\''){\r
1990                                         error_details = "Too many characters in character literal";\r
1991                                         Report.Error (1012, Location, error_details);\r
1992 \r
1993                                         // Try to recover, read until newline or next "'"\r
1994                                         while ((c = getChar ()) != -1){\r
1995                                                 if (c == '\n' || c == '\''){\r
1996                                                         line++;\r
1997                                                         ref_line++;\r
1998                                                         col = 0;\r
1999                                                         break;\r
2000                                                 } else\r
2001                                                         col++;\r
2002                                         }\r
2003                                         return Token.ERROR;\r
2004                                 }\r
2005                                 return Token.LITERAL_CHARACTER;\r
2006                         }\r
2007                                 \r
2008                         if (c == '@') {\r
2009                                 c = getChar ();\r
2010                                 if (c == '"') {\r
2011                                         tokens_seen = true;\r
2012                                         return consume_string (true);\r
2013                                 } else if (is_identifier_start_character ((char) c)){\r
2014                                         return consume_identifier (c, true);\r
2015                                 } else {\r
2016                                         Report.Error (1033, Location, "'@' must be followed by string constant or identifier");\r
2017                                 }\r
2018                         }\r
2019 \r
2020                         if (c == '#') {\r
2021                                 error_details = "Preprocessor directives must appear as the first non-whitespace " +\r
2022                                         "character on a line.";\r
2023 \r
2024                                 Report.Error (1040, Location, error_details);\r
2025 \r
2026                                 return Token.ERROR;\r
2027                         }\r
2028 \r
2029                         error_details = ((char)c).ToString ();\r
2030 \r
2031                         return Token.ERROR;\r
2032                 }\r
2033 \r
2034                 public void cleanup ()\r
2035                 {\r
2036                         if (ifstack != null && ifstack.Count >= 1) {\r
2037                                 int state = (int) ifstack.Pop ();\r
2038                                 if ((state & REGION) != 0)\r
2039                                         Report.Error (1038, "#endregion directive expected");\r
2040                                 else \r
2041                                         Report.Error (1027, "#endif directive expected");\r
2042                         }\r
2043                                 \r
2044                 }\r
2045         }\r
2046 }\r
2047 \r