mcs/mcs/cs-tokenizer.cs

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