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