mcs/mcs/cs-tokenizer.cs

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