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                 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                 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                 }\r
 382 \r
 383                 int is_punct (char c, ref bool doread)\r
 384                 {\r
 385                         int d;\r
 386                         int t;\r
 387 \r
 388                         doread = false;\r
 389 \r
 390                         switch (c){\r
 391                         case '{':\r
 392                                 return Token.OPEN_BRACE;\r
 393                         case '}':\r
 394                                 return Token.CLOSE_BRACE;\r
 395                         case '[':\r
 396                                 return Token.OPEN_BRACKET;\r
 397                         case ']':\r
 398                                 return Token.CLOSE_BRACKET;\r
 399                         case '(':\r
 400                                 return Token.OPEN_PARENS;\r
 401                         case ')': {\r
 402                                 if (deambiguate_close_parens == 0)\r
 403                                         return Token.CLOSE_PARENS;\r
 404 \r
 405                                 --deambiguate_close_parens;\r
 406 \r
 407                                 // Save current position and parse next token.\r
 408                                 int old = reader.Position;\r
 409                                 int new_token = token ();\r
 410                                 reader.Position = old;\r
 411                                 putback_char = -1;\r
 412 \r
 413                                 if (new_token == Token.OPEN_PARENS)\r
 414                                         return Token.CLOSE_PARENS_OPEN_PARENS;\r
 415                                 else if (new_token == Token.MINUS)\r
 416                                         return Token.CLOSE_PARENS_MINUS;\r
 417                                 else if (IsCastToken (new_token))\r
 418                                         return Token.CLOSE_PARENS_CAST;\r
 419                                 else\r
 420                                         return Token.CLOSE_PARENS_NO_CAST;\r
 421                         }\r
 422 \r
 423                         case ',':\r
 424                                 return Token.COMMA;\r
 425                         case ':':\r
 426                                 return Token.COLON;\r
 427                         case ';':\r
 428                                 return Token.SEMICOLON;\r
 429                         case '~':\r
 430                                 return Token.TILDE;\r
 431                         case '?':\r
 432                                 return Token.INTERR;\r
 433                         }\r
 434 \r
 435                         d = peekChar ();\r
 436                         if (c == '+'){\r
 437                                 \r
 438                                 if (d == '+')\r
 439                                         t = Token.OP_INC;\r
 440                                 else if (d == '=')\r
 441                                         t = Token.OP_ADD_ASSIGN;\r
 442                                 else\r
 443                                         return Token.PLUS;\r
 444                                 doread = true;\r
 445                                 return t;\r
 446                         }\r
 447                         if (c == '-'){\r
 448                                 if (d == '-')\r
 449                                         t = Token.OP_DEC;\r
 450                                 else if (d == '=')\r
 451                                         t = Token.OP_SUB_ASSIGN;\r
 452                                 else if (d == '>')\r
 453                                         t = Token.OP_PTR;\r
 454                                 else\r
 455                                         return Token.MINUS;\r
 456                                 doread = true;\r
 457                                 return t;\r
 458                         }\r
 459 \r
 460                         if (c == '!'){\r
 461                                 if (d == '='){\r
 462                                         doread = true;\r
 463                                         return Token.OP_NE;\r
 464                                 }\r
 465                                 return Token.BANG;\r
 466                         }\r
 467 \r
 468                         if (c == '='){\r
 469                                 if (d == '='){\r
 470                                         doread = true;\r
 471                                         return Token.OP_EQ;\r
 472                                 }\r
 473                                 return Token.ASSIGN;\r
 474                         }\r
 475 \r
 476                         if (c == '&'){\r
 477                                 if (d == '&'){\r
 478                                         doread = true;\r
 479                                         return Token.OP_AND;\r
 480                                 } else if (d == '='){\r
 481                                         doread = true;\r
 482                                         return Token.OP_AND_ASSIGN;\r
 483                                 }\r
 484                                 return Token.BITWISE_AND;\r
 485                         }\r
 486 \r
 487                         if (c == '|'){\r
 488                                 if (d == '|'){\r
 489                                         doread = true;\r
 490                                         return Token.OP_OR;\r
 491                                 } else if (d == '='){\r
 492                                         doread = true;\r
 493                                         return Token.OP_OR_ASSIGN;\r
 494                                 }\r
 495                                 return Token.BITWISE_OR;\r
 496                         }\r
 497 \r
 498                         if (c == '*'){\r
 499                                 if (d == '='){\r
 500                                         doread = true;\r
 501                                         return Token.OP_MULT_ASSIGN;\r
 502                                 }\r
 503                                 return Token.STAR;\r
 504                         }\r
 505 \r
 506                         if (c == '/'){\r
 507                                 if (d == '='){\r
 508                                         doread = true;\r
 509                                         return Token.OP_DIV_ASSIGN;\r
 510                                 }\r
 511                                 return Token.DIV;\r
 512                         }\r
 513 \r
 514                         if (c == '%'){\r
 515                                 if (d == '='){\r
 516                                         doread = true;\r
 517                                         return Token.OP_MOD_ASSIGN;\r
 518                                 }\r
 519                                 return Token.PERCENT;\r
 520                         }\r
 521 \r
 522                         if (c == '^'){\r
 523                                 if (d == '='){\r
 524                                         doread = true;\r
 525                                         return Token.OP_XOR_ASSIGN;\r
 526                                 }\r
 527                                 return Token.CARRET;\r
 528                         }\r
 529 \r
 530                         if (c == '<'){\r
 531                                 if (d == '<'){\r
 532                                         getChar ();\r
 533                                         d = peekChar ();\r
 534 \r
 535                                         if (d == '='){\r
 536                                                 doread = true;\r
 537                                                 return Token.OP_SHIFT_LEFT_ASSIGN;\r
 538                                         }\r
 539                                         return Token.OP_SHIFT_LEFT;\r
 540                                 } else if (d == '='){\r
 541                                         doread = true;\r
 542                                         return Token.OP_LE;\r
 543                                 }\r
 544                                 return Token.OP_LT;\r
 545                         }\r
 546 \r
 547                         if (c == '>'){\r
 548                                 if (d == '>'){\r
 549                                         getChar ();\r
 550                                         d = peekChar ();\r
 551 \r
 552                                         if (d == '='){\r
 553                                                 doread = true;\r
 554                                                 return Token.OP_SHIFT_RIGHT_ASSIGN;\r
 555                                         }\r
 556                                         return Token.OP_SHIFT_RIGHT;\r
 557                                 } else if (d == '='){\r
 558                                         doread = true;\r
 559                                         return Token.OP_GE;\r
 560                                 }\r
 561                                 return Token.OP_GT;\r
 562                         }\r
 563                         return Token.ERROR;\r
 564                 }\r
 565 \r
 566                 int deambiguate_close_parens = 0;\r
 567 \r
 568                 public void Deambiguate_CloseParens ()\r
 569                 {\r
 570                         putback (')');\r
 571                         deambiguate_close_parens++;\r
 572                 }\r
 573 \r
 574                 void Error_NumericConstantTooLong ()\r
 575                 {\r
 576                         Report.Error (1021, Location, "Numeric constant too long");                     \r
 577                 }\r
 578                 \r
 579                 bool decimal_digits (int c)\r
 580                 {\r
 581                         int d;\r
 582                         bool seen_digits = false;\r
 583                         \r
 584                         if (c != -1){\r
 585                                 if (number_pos == max_number_size)\r
 586                                         Error_NumericConstantTooLong ();\r
 587                                 number_builder [number_pos++] = (char) c;\r
 588                         }\r
 589                         \r
 590                         //\r
 591                         // We use peekChar2, because decimal_digits needs to do a \r
 592                         // 2-character look-ahead (5.ToString for example).\r
 593                         //\r
 594                         while ((d = peekChar2 ()) != -1){\r
 595                                 if (d >= '0' && d <= '9'){\r
 596                                         if (number_pos == max_number_size)\r
 597                                                 Error_NumericConstantTooLong ();\r
 598                                         number_builder [number_pos++] = (char) d;\r
 599                                         getChar ();\r
 600                                         seen_digits = true;\r
 601                                 } else\r
 602                                         break;\r
 603                         }\r
 604                         \r
 605                         return seen_digits;\r
 606                 }\r
 607 \r
 608                 bool is_hex (int e)\r
 609                 {\r
 610                         return (e >= '0' && e <= '9') || (e >= 'A' && e <= 'F') || (e >= 'a' && e <= 'f');\r
 611                 }\r
 612                 \r
 613                 void hex_digits (int c)\r
 614                 {\r
 615                         if (c != -1)\r
 616                                 number_builder [number_pos++] = (char) c;\r
 617                         \r
 618                 }\r
 619                 \r
 620                 int real_type_suffix (int c)\r
 621                 {\r
 622                         int t;\r
 623 \r
 624                         switch (c){\r
 625                         case 'F': case 'f':\r
 626                                 t =  Token.LITERAL_FLOAT;\r
 627                                 break;\r
 628                         case 'D': case 'd':\r
 629                                 t = Token.LITERAL_DOUBLE;\r
 630                                 break;\r
 631                         case 'M': case 'm':\r
 632                                  t= Token.LITERAL_DECIMAL;\r
 633                                 break;\r
 634                         default:\r
 635                                 return Token.NONE;\r
 636                         }\r
 637                         return t;\r
 638                 }\r
 639 \r
 640                 int integer_type_suffix (ulong ul, int c)\r
 641                 {\r
 642                         bool is_unsigned = false;\r
 643                         bool is_long = false;\r
 644 \r
 645                         if (c != -1){\r
 646                                 bool scanning = true;\r
 647                                 do {\r
 648                                         switch (c){\r
 649                                         case 'U': case 'u':\r
 650                                                 if (is_unsigned)\r
 651                                                         scanning = false;\r
 652                                                 is_unsigned = true;\r
 653                                                 getChar ();\r
 654                                                 break;\r
 655 \r
 656                                         case 'l':\r
 657                                                 if (!is_unsigned){\r
 658                                                         //\r
 659                                                         // if we have not seen anything in between\r
 660                                                         // report this error\r
 661                                                         //\r
 662                                                         Report.Warning (\r
 663                                                                 78, Location,\r
 664                                                         "the 'l' suffix is easily confused with digit `1'," +\r
 665                                                         " use 'L' for clarity");\r
 666                                                 }\r
 667                                                 goto case 'L';\r
 668                                                 \r
 669                                         case 'L': \r
 670                                                 if (is_long)\r
 671                                                         scanning = false;\r
 672                                                 is_long = true;\r
 673                                                 getChar ();\r
 674                                                 break;\r
 675                                                 \r
 676                                         default:\r
 677                                                 scanning = false;\r
 678                                                 break;\r
 679                                         }\r
 680                                         c = peekChar ();\r
 681                                 } while (scanning);\r
 682                         }\r
 683 \r
 684                         if (is_long && is_unsigned){\r
 685                                 val = ul;\r
 686                                 return Token.LITERAL_INTEGER;\r
 687                         } else if (is_unsigned){\r
 688                                 // uint if possible, or ulong else.\r
 689 \r
 690                                 if ((ul & 0xffffffff00000000) == 0)\r
 691                                         val = (uint) ul;\r
 692                                 else\r
 693                                         val = ul;\r
 694                         } else if (is_long){\r
 695                                 // long if possible, ulong otherwise\r
 696                                 if ((ul & 0x8000000000000000) != 0)\r
 697                                         val = ul;\r
 698                                 else\r
 699                                         val = (long) ul;\r
 700                         } else {\r
 701                                 // int, uint, long or ulong in that order\r
 702                                 if ((ul & 0xffffffff00000000) == 0){\r
 703                                         uint ui = (uint) ul;\r
 704                                         \r
 705                                         if ((ui & 0x80000000) != 0)\r
 706                                                 val = ui;\r
 707                                         else\r
 708                                                 val = (int) ui;\r
 709                                 } else {\r
 710                                         if ((ul & 0x8000000000000000) != 0)\r
 711                                                 val = ul;\r
 712                                         else\r
 713                                                 val = (long) ul;\r
 714                                 }\r
 715                         }\r
 716                         return Token.LITERAL_INTEGER;\r
 717                 }\r
 718                                 \r
 719                 //\r
 720                 // given `c' as the next char in the input decide whether\r
 721                 // we need to convert to a special type, and then choose\r
 722                 // the best representation for the integer\r
 723                 //\r
 724                 int adjust_int (int c)\r
 725                 {\r
 726                         try {\r
 727                                 if (number_pos > 9){\r
 728                                         ulong ul = (uint) (number_builder [0] - '0');\r
 729 \r
 730                                         for (int i = 1; i < number_pos; i++){\r
 731                                                 ul = checked ((ul * 10) + ((uint)(number_builder [i] - '0')));\r
 732                                         }\r
 733                                         return integer_type_suffix (ul, c);\r
 734                                 } else {\r
 735                                         uint ui = (uint) (number_builder [0] - '0');\r
 736 \r
 737                                         for (int i = 1; i < number_pos; i++){\r
 738                                                 ui = checked ((ui * 10) + ((uint)(number_builder [i] - '0')));\r
 739                                         }\r
 740                                         return integer_type_suffix (ui, c);\r
 741                                 }\r
 742                         } catch (OverflowException) {\r
 743                                 error_details = "Integral constant is too large";\r
 744                                 Report.Error (1021, Location, error_details);\r
 745                                 val = 0ul;\r
 746                                 return Token.LITERAL_INTEGER;\r
 747                         }\r
 748                 }\r
 749                 \r
 750                 int adjust_real (int t)\r
 751                 {\r
 752                         string s = new String (number_builder, 0, number_pos);\r
 753 \r
 754                         switch (t){\r
 755                         case Token.LITERAL_DECIMAL:\r
 756                                 try {\r
 757                                         val = System.Decimal.Parse (s, styles, csharp_format_info);\r
 758                                 } catch (OverflowException) {\r
 759                                         val = 0m;     \r
 760                                         error_details = "Floating-point constant is outside the range of the type 'decimal'";\r
 761                                         Report.Error (594, Location, error_details);\r
 762                                 }\r
 763                                 break;\r
 764                         case Token.LITERAL_FLOAT:\r
 765                                 try {\r
 766                                         val = (float) System.Double.Parse (s, styles, csharp_format_info);\r
 767                                 } catch (OverflowException) {\r
 768                                         val = 0.0f;     \r
 769                                         error_details = "Floating-point constant is outside the range of the type 'float'";\r
 770                                         Report.Error (594, Location, error_details);\r
 771                                 }\r
 772                                 break;\r
 773                                 \r
 774                         case Token.LITERAL_DOUBLE:\r
 775                         case Token.NONE:\r
 776                                 t = Token.LITERAL_DOUBLE;\r
 777                                 try {\r
 778                                         val = System.Double.Parse (s, styles, csharp_format_info);\r
 779                                 } catch (OverflowException) {\r
 780                                         val = 0.0;     \r
 781                                         error_details = "Floating-point constant is outside the range of the type 'double'";\r
 782                                         Report.Error (594, Location, error_details);\r
 783                                 }\r
 784                                 break;\r
 785                         }\r
 786                         return t;\r
 787                 }\r
 788 \r
 789                 int handle_hex ()\r
 790                 {\r
 791                         int d;\r
 792                         ulong ul;\r
 793                         \r
 794                         getChar ();\r
 795                         while ((d = peekChar ()) != -1){\r
 796                                 if (is_hex (d)){\r
 797                                         number_builder [number_pos++] = (char) d;\r
 798                                         getChar ();\r
 799                                 } else\r
 800                                         break;\r
 801                         }\r
 802                         \r
 803                         string s = new String (number_builder, 0, number_pos);\r
 804                         try {\r
 805                                 if (number_pos <= 8)\r
 806                                         ul = System.UInt32.Parse (s, NumberStyles.HexNumber);\r
 807                                 else\r
 808                                         ul = System.UInt64.Parse (s, NumberStyles.HexNumber);\r
 809                         } catch (OverflowException){\r
 810                                 error_details = "Integral constant is too large";\r
 811                                 Report.Error (1021, Location, error_details);\r
 812                                 val = 0ul;\r
 813                                 return Token.LITERAL_INTEGER;\r
 814                         }\r
 815                         \r
 816                         return integer_type_suffix (ul, peekChar ());\r
 817                 }\r
 818 \r
 819                 //\r
 820                 // Invoked if we know we have .digits or digits\r
 821                 //\r
 822                 int is_number (int c)\r
 823                 {\r
 824                         bool is_real = false;\r
 825                         int type;\r
 826 \r
 827                         number_pos = 0;\r
 828 \r
 829                         if (c >= '0' && c <= '9'){\r
 830                                 if (c == '0'){\r
 831                                         int peek = peekChar ();\r
 832 \r
 833                                         if (peek == 'x' || peek == 'X')\r
 834                                                 return handle_hex ();\r
 835                                 }\r
 836                                 decimal_digits (c);\r
 837                                 c = getChar ();\r
 838                         }\r
 839 \r
 840                         //\r
 841                         // We need to handle the case of\r
 842                         // "1.1" vs "1.string" (LITERAL_FLOAT vs NUMBER DOT IDENTIFIER)\r
 843                         //\r
 844                         if (c == '.'){\r
 845                                 if (decimal_digits ('.')){\r
 846                                         is_real = true;\r
 847                                         c = getChar ();\r
 848                                 } else {\r
 849                                         putback ('.');\r
 850                                         number_pos--;\r
 851                                         return adjust_int (-1);\r
 852                                 }\r
 853                         }\r
 854                         \r
 855                         if (c == 'e' || c == 'E'){\r
 856                                 is_real = true;\r
 857                                 if (number_pos == max_number_size)\r
 858                                         Error_NumericConstantTooLong ();\r
 859                                 number_builder [number_pos++] = 'e';\r
 860                                 c = getChar ();\r
 861                                 \r
 862                                 if (c == '+'){\r
 863                                         if (number_pos == max_number_size)\r
 864                                                 Error_NumericConstantTooLong ();\r
 865                                         number_builder [number_pos++] = '+';\r
 866                                         c = -1;\r
 867                                 } else if (c == '-') {\r
 868                                         if (number_pos == max_number_size)\r
 869                                                 Error_NumericConstantTooLong ();\r
 870                                         number_builder [number_pos++] = '-';\r
 871                                         c = -1;\r
 872                                 } else {\r
 873                                         if (number_pos == max_number_size)\r
 874                                                 Error_NumericConstantTooLong ();\r
 875                                         number_builder [number_pos++] = '+';\r
 876                                 }\r
 877                                         \r
 878                                 decimal_digits (c);\r
 879                                 c = getChar ();\r
 880                         }\r
 881 \r
 882                         type = real_type_suffix (c);\r
 883                         if (type == Token.NONE && !is_real){\r
 884                                 putback (c);\r
 885                                 return adjust_int (c);\r
 886                         } else \r
 887                                 is_real = true;\r
 888 \r
 889                         if (type == Token.NONE){\r
 890                                 putback (c);\r
 891                         }\r
 892                         \r
 893                         if (is_real)\r
 894                                 return adjust_real (type);\r
 895 \r
 896                         Console.WriteLine ("This should not be reached");\r
 897                         throw new Exception ("Is Number should never reach this point");\r
 898                 }\r
 899 \r
 900                 //\r
 901                 // Accepts exactly count (4 or 8) hex, no more no less\r
 902                 //\r
 903                 int getHex (int count, out bool error)\r
 904                 {\r
 905                         int i;\r
 906                         int total = 0;\r
 907                         int c;\r
 908                         int top = count != -1 ? count : 4;\r
 909                         \r
 910                         getChar ();\r
 911                         error = false;\r
 912                         for (i = 0; i < top; i++){\r
 913                                 c = getChar ();\r
 914                                 \r
 915                                 if (c >= '0' && c <= '9')\r
 916                                         c = (int) c - (int) '0';\r
 917                                 else if (c >= 'A' && c <= 'F')\r
 918                                         c = (int) c - (int) 'A' + 10;\r
 919                                 else if (c >= 'a' && c <= 'f')\r
 920                                         c = (int) c - (int) 'a' + 10;\r
 921                                 else {\r
 922                                         error = true;\r
 923                                         return 0;\r
 924                                 }\r
 925                                 \r
 926                                 total = (total * 16) + c;\r
 927                                 if (count == -1){\r
 928                                         int p = peekChar ();\r
 929                                         if (p == -1)\r
 930                                                 break;\r
 931                                         if (!is_hex ((char)p))\r
 932                                                 break;\r
 933                                 }\r
 934                         }\r
 935                         return total;\r
 936                 }\r
 937 \r
 938                 int escape (int c)\r
 939                 {\r
 940                         bool error;\r
 941                         int d;\r
 942                         int v;\r
 943 \r
 944                         d = peekChar ();\r
 945                         if (c != '\\')\r
 946                                 return c;\r
 947                         \r
 948                         switch (d){\r
 949                         case 'a':\r
 950                                 v = '\a'; break;\r
 951                         case 'b':\r
 952                                 v = '\b'; break;\r
 953                         case 'n':\r
 954                                 v = '\n'; break;\r
 955                         case 't':\r
 956                                 v = '\t'; break;\r
 957                         case 'v':\r
 958                                 v = '\v'; break;\r
 959                         case 'r':\r
 960                                 v = '\r'; break;\r
 961                         case '\\':\r
 962                                 v = '\\'; break;\r
 963                         case 'f':\r
 964                                 v = '\f'; break;\r
 965                         case '0':\r
 966                                 v = 0; break;\r
 967                         case '"':\r
 968                                 v = '"'; break;\r
 969                         case '\'':\r
 970                                 v = '\''; break;\r
 971                         case 'x':\r
 972                                 v = getHex (-1, out error);\r
 973                                 if (error)\r
 974                                         goto default;\r
 975                                 return v;\r
 976                         case 'u':\r
 977                                 v = getHex (4, out error);\r
 978                                 if (error)\r
 979                                         goto default;\r
 980                                 return v;\r
 981                         case 'U':\r
 982                                 v = getHex (8, out error);\r
 983                                 if (error)\r
 984                                         goto default;\r
 985                                 return v;\r
 986                         default:\r
 987                                 Report.Error (1009, Location, "Unrecognized escape sequence in " + (char)d);\r
 988                                 return d;\r
 989                         }\r
 990                         getChar ();\r
 991                         return v;\r
 992                 }\r
 993 \r
 994                 int getChar ()\r
 995                 {\r
 996                         if (putback_char != -1){\r
 997                                 int x = putback_char;\r
 998                                 putback_char = -1;\r
 999 \r
1000                                 return x;\r
1001                         }\r
1002                         return reader.Read ();\r
1003                 }\r
1004 \r
1005                 int peekChar ()\r
1006                 {\r
1007                         if (putback_char != -1)\r
1008                                 return putback_char;\r
1009                         putback_char = reader.Read ();\r
1010                         return putback_char;\r
1011                 }\r
1012 \r
1013                 int peekChar2 ()\r
1014                 {\r
1015                         if (putback_char != -1)\r
1016                                 return putback_char;\r
1017                         return reader.Peek ();\r
1018                 }\r
1019                 \r
1020                 void putback (int c)\r
1021                 {\r
1022                         if (putback_char != -1){\r
1023                                 Console.WriteLine ("Col: " + col);\r
1024                                 Console.WriteLine ("Row: " + line);\r
1025                                 Console.WriteLine ("Name: " + ref_name.Name);\r
1026                                 Console.WriteLine ("Current [{0}] putting back [{1}]  ", putback_char, c);\r
1027                                 throw new Exception ("This should not happen putback on putback");\r
1028                         }\r
1029                         putback_char = c;\r
1030                 }\r
1031 \r
1032                 public bool advance ()\r
1033                 {\r
1034                         return peekChar () != -1;\r
1035                 }\r
1036 \r
1037                 public Object Value {\r
1038                         get {\r
1039                                 return val;\r
1040                         }\r
1041                 }\r
1042 \r
1043                 public Object value ()\r
1044                 {\r
1045                         return val;\r
1046                 }\r
1047 \r
1048                 bool IsCastToken (int token)\r
1049                 {\r
1050                         switch (token) {\r
1051                         case Token.BANG:\r
1052                         case Token.TILDE:\r
1053                         case Token.IDENTIFIER:\r
1054                         case Token.LITERAL_INTEGER:\r
1055                         case Token.LITERAL_FLOAT:\r
1056                         case Token.LITERAL_DOUBLE:\r
1057                         case Token.LITERAL_DECIMAL:\r
1058                         case Token.LITERAL_CHARACTER:\r
1059                         case Token.LITERAL_STRING:\r
1060                         case Token.BASE:\r
1061                         case Token.CHECKED:\r
1062                         case Token.FALSE:\r
1063                         case Token.FIXED:\r
1064                         case Token.NEW:\r
1065                         case Token.NULL:\r
1066                         case Token.SIZEOF:\r
1067                         case Token.THIS:\r
1068                         case Token.THROW:\r
1069                         case Token.TRUE:\r
1070                         case Token.TYPEOF:\r
1071                         case Token.UNCHECKED:\r
1072                         case Token.UNSAFE:\r
1073 \r
1074                                 //\r
1075                                 // These can be part of a member access\r
1076                                 //\r
1077                         case Token.INT:\r
1078                         case Token.UINT:\r
1079                         case Token.SHORT:\r
1080                         case Token.USHORT:\r
1081                         case Token.LONG:\r
1082                         case Token.ULONG:\r
1083                         case Token.DOUBLE:\r
1084                         case Token.FLOAT:\r
1085                         case Token.CHAR:\r
1086                                 return true;\r
1087 \r
1088                         default:\r
1089                                 return false;\r
1090                         }\r
1091                 }\r
1092 \r
1093                 public int token ()\r
1094                 {\r
1095                         current_token = xtoken ();\r
1096                         return current_token;\r
1097                 }\r
1098 \r
1099                 static StringBuilder static_cmd_arg = new System.Text.StringBuilder ();\r
1100                 \r
1101                 void get_cmd_arg (out string cmd, out string arg)\r
1102                 {\r
1103                         int c;\r
1104                         \r
1105                         tokens_seen = false;\r
1106                         arg = "";\r
1107                         static_cmd_arg.Length = 0;\r
1108 \r
1109                         // skip over white space\r
1110                         while ((c = getChar ()) != -1 && (c != '\n') && ((c == '\r') || (c == ' ') || (c == '\t')))\r
1111                                 ;\r
1112 \r
1113 \r
1114                         while ((c != -1) && (c != '\n') && (c != ' ') && (c != '\t') && (c != '\r')){\r
1115                                 if (is_identifier_part_character ((char) c)){\r
1116                                         static_cmd_arg.Append ((char) c);\r
1117                                         c = getChar ();\r
1118                                 } else {\r
1119                                         putback (c);\r
1120                                         break;\r
1121                                 }\r
1122                         }\r
1123 \r
1124                         cmd = static_cmd_arg.ToString ();\r
1125 \r
1126                         if (c == '\n'){\r
1127                                 line++;\r
1128                                 ref_line++;\r
1129                                 return;\r
1130                         } else if (c == '\r')\r
1131                                 col = 0;\r
1132 \r
1133                         // skip over white space\r
1134                         while ((c = getChar ()) != -1 && (c != '\n') && ((c == '\r') || (c == ' ') || (c == '\t')))\r
1135                                 ;\r
1136 \r
1137                         if (c == '\n'){\r
1138                                 line++;\r
1139                                 ref_line++;\r
1140                                 return;\r
1141                         } else if (c == '\r'){\r
1142                                 col = 0;\r
1143                                 return;\r
1144                         }\r
1145                         \r
1146                         static_cmd_arg.Length = 0;\r
1147                         static_cmd_arg.Append ((char) c);\r
1148                         \r
1149                         while ((c = getChar ()) != -1 && (c != '\n') && (c != '\r')){\r
1150                                 static_cmd_arg.Append ((char) c);\r
1151                         }\r
1152 \r
1153                         if (c == '\n'){\r
1154                                 line++;\r
1155                                 ref_line++;\r
1156                         } else if (c == '\r')\r
1157                                 col = 0;\r
1158                         arg = static_cmd_arg.ToString ().Trim ();\r
1159                 }\r
1160 \r
1161                 //\r
1162                 // Handles the #line directive\r
1163                 //\r
1164                 bool PreProcessLine (string arg)\r
1165                 {\r
1166                         if (arg == "")\r
1167                                 return false;\r
1168 \r
1169                         if (arg == "default"){\r
1170                                 ref_line = line;\r
1171                                 ref_name = file_name;\r
1172                                 Location.Push (ref_name);\r
1173                                 return true;\r
1174                         } else if (arg == "hidden"){\r
1175                                 //\r
1176                                 // We ignore #line hidden\r
1177                                 //\r
1178                                 return true;\r
1179                         }\r
1180 \r
1181                         try {\r
1182                                 int pos;\r
1183 \r
1184                                 if ((pos = arg.IndexOf (' ')) != -1 && pos != 0){\r
1185                                         ref_line = System.Int32.Parse (arg.Substring (0, pos));\r
1186                                         pos++;\r
1187                                         \r
1188                                         char [] quotes = { '\"' };\r
1189                                         \r
1190                                         string name = arg.Substring (pos). Trim (quotes);\r
1191                                         ref_name = Location.LookupFile (name);\r
1192                                         file_name.HasLineDirective = true;\r
1193                                         ref_name.HasLineDirective = true;\r
1194                                         Location.Push (ref_name);\r
1195                                 } else {\r
1196                                         ref_line = System.Int32.Parse (arg);\r
1197                                 }\r
1198                         } catch {\r
1199                                 return false;\r
1200                         }\r
1201                         \r
1202                         return true;\r
1203                 }\r
1204 \r
1205                 //\r
1206                 // Handles #define and #undef\r
1207                 //\r
1208                 void PreProcessDefinition (bool is_define, string arg)\r
1209                 {\r
1210                         if (arg == "" || arg == "true" || arg == "false"){\r
1211                                 Report.Error (1001, Location, "Missing identifer to pre-processor directive");\r
1212                                 return;\r
1213                         }\r
1214 \r
1215                         char[] whitespace = { ' ', '\t' };\r
1216                         if (arg.IndexOfAny (whitespace) != -1){\r
1217                                 Report.Error (1025, Location, "Single-line comment or end-of-line expected");\r
1218                                 return;\r
1219                         }\r
1220 \r
1221                         if (!is_identifier_start_character (arg [0]))\r
1222                                 Report.Error (1001, Location, "Identifier expected: " + arg);\r
1223                         \r
1224                         foreach (char c in arg.Substring (1)){\r
1225                                 if (!is_identifier_part_character (c)){\r
1226                                         Report.Error (1001, Location, "Identifier expected: " + arg);\r
1227                                         return;\r
1228                                 }\r
1229                         }\r
1230 \r
1231                         if (is_define){\r
1232                                 if (defines == null)\r
1233                                         defines = new Hashtable ();\r
1234                                 define (arg);\r
1235                         } else {\r
1236                                 if (defines == null)\r
1237                                         return;\r
1238                                 if (defines.Contains (arg))\r
1239                                         defines.Remove (arg);\r
1240                         }\r
1241                 }\r
1242 \r
1243                 bool eval_val (string s)\r
1244                 {\r
1245                         if (s == "true")\r
1246                                 return true;\r
1247                         if (s == "false")\r
1248                                 return false;\r
1249                         \r
1250                         if (defines == null)\r
1251                                 return false;\r
1252                         if (defines.Contains (s))\r
1253                                 return true;\r
1254 \r
1255                         return false;\r
1256                 }\r
1257 \r
1258                 bool pp_primary (ref string s)\r
1259                 {\r
1260                         s = s.Trim ();\r
1261                         int len = s.Length;\r
1262 \r
1263                         if (len > 0){\r
1264                                 char c = s [0];\r
1265                                 \r
1266                                 if (c == '('){\r
1267                                         s = s.Substring (1);\r
1268                                         bool val = pp_expr (ref s);\r
1269                                         if (s.Length > 0 && s [0] == ')'){\r
1270                                                 s = s.Substring (1);\r
1271                                                 return val;\r
1272                                         }\r
1273                                         Error_InvalidDirective ();\r
1274                                         return false;\r
1275                                 }\r
1276                                 \r
1277                                 if (is_identifier_start_character (c)){\r
1278                                         int j = 1;\r
1279 \r
1280                                         while (j < len){\r
1281                                                 c = s [j];\r
1282                                                 \r
1283                                                 if (is_identifier_part_character (c)){\r
1284                                                         j++;\r
1285                                                         continue;\r
1286                                                 }\r
1287                                                 bool v = eval_val (s.Substring (0, j));\r
1288                                                 s = s.Substring (j);\r
1289                                                 return v;\r
1290                                         }\r
1291                                         bool vv = eval_val (s);\r
1292                                         s = "";\r
1293                                         return vv;\r
1294                                 }\r
1295                         }\r
1296                         Error_InvalidDirective ();\r
1297                         return false;\r
1298                 }\r
1299                 \r
1300                 bool pp_unary (ref string s)\r
1301                 {\r
1302                         s = s.Trim ();\r
1303                         int len = s.Length;\r
1304 \r
1305                         if (len > 0){\r
1306                                 if (s [0] == '!'){\r
1307                                         if (len > 1 && s [1] == '='){\r
1308                                                 Error_InvalidDirective ();\r
1309                                                 return false;\r
1310                                         }\r
1311                                         s = s.Substring (1);\r
1312                                         return ! pp_primary (ref s);\r
1313                                 } else\r
1314                                         return pp_primary (ref s);\r
1315                         } else {\r
1316                                 Error_InvalidDirective ();\r
1317                                 return false;\r
1318                         }\r
1319                 }\r
1320                 \r
1321                 bool pp_eq (ref string s)\r
1322                 {\r
1323                         bool va = pp_unary (ref s);\r
1324 \r
1325                         s = s.Trim ();\r
1326                         int len = s.Length;\r
1327                         if (len > 0){\r
1328                                 if (s [0] == '='){\r
1329                                         if (len > 2 && s [1] == '='){\r
1330                                                 s = s.Substring (2);\r
1331                                                 return va == pp_unary (ref s);\r
1332                                         } else {\r
1333                                                 Error_InvalidDirective ();\r
1334                                                 return false;\r
1335                                         }\r
1336                                 } else if (s [0] == '!' && len > 1 && s [1] == '='){\r
1337                                         s = s.Substring (2);\r
1338 \r
1339                                         return va != pp_unary (ref s);\r
1340 \r
1341                                 } \r
1342                         }\r
1343 \r
1344                         return va;\r
1345                                 \r
1346                 }\r
1347                 \r
1348                 bool pp_and (ref string s)\r
1349                 {\r
1350                         bool va = pp_eq (ref s);\r
1351 \r
1352                         s = s.Trim ();\r
1353                         int len = s.Length;\r
1354                         if (len > 0){\r
1355                                 if (s [0] == '&'){\r
1356                                         if (len > 2 && s [1] == '&'){\r
1357                                                 s = s.Substring (2);\r
1358                                                 return (va & pp_eq (ref s));\r
1359                                         } else {\r
1360                                                 Error_InvalidDirective ();\r
1361                                                 return false;\r
1362                                         }\r
1363                                 } \r
1364                         }\r
1365                         return va;\r
1366                 }\r
1367                 \r
1368                 //\r
1369                 // Evaluates an expression for `#if' or `#elif'\r
1370                 //\r
1371                 bool pp_expr (ref string s)\r
1372                 {\r
1373                         bool va = pp_and (ref s);\r
1374                         s = s.Trim ();\r
1375                         int len = s.Length;\r
1376                         if (len > 0){\r
1377                                 char c = s [0];\r
1378                                 \r
1379                                 if (c == '|'){\r
1380                                         if (len > 2 && s [1] == '|'){\r
1381                                                 s = s.Substring (2);\r
1382                                                 return va | pp_expr (ref s);\r
1383                                         } else {\r
1384                                                 Error_InvalidDirective ();\r
1385                                                 return false;\r
1386                                         }\r
1387                                 } \r
1388                         }\r
1389                         \r
1390                         return va;\r
1391                 }\r
1392 \r
1393                 bool eval (string s)\r
1394                 {\r
1395                         bool v = pp_expr (ref s);\r
1396                         s = s.Trim ();\r
1397                         if (s.Length != 0){\r
1398                                 Error_InvalidDirective ();\r
1399                                 return false;\r
1400                         }\r
1401 \r
1402                         return v;\r
1403                 }\r
1404                 \r
1405                 void Error_InvalidDirective ()\r
1406                 {\r
1407                         Report.Error (1517, Location, "Invalid pre-processor directive");\r
1408                 }\r
1409 \r
1410                 void Error_UnexpectedDirective (string extra)\r
1411                 {\r
1412                         Report.Error (\r
1413                                 1028, Location,\r
1414                                 "Unexpected processor directive (" + extra + ")");\r
1415                 }\r
1416 \r
1417                 void Error_TokensSeen ()\r
1418                 {\r
1419                         Report.Error (\r
1420                                 1032, Location,\r
1421                                 "Cannot define or undefine pre-processor symbols after a token in the file");\r
1422                 }\r
1423                 \r
1424                 //\r
1425                 // if true, then the code continues processing the code\r
1426                 // if false, the code stays in a loop until another directive is\r
1427                 // reached.\r
1428                 //\r
1429                 bool handle_preprocessing_directive (bool caller_is_taking)\r
1430                 {\r
1431                         string cmd, arg;\r
1432                         bool region_directive = false;\r
1433 \r
1434                         get_cmd_arg (out cmd, out arg);\r
1435 \r
1436                         // Eat any trailing whitespaces and single-line comments\r
1437                         if (arg.IndexOf ("//") != -1)\r
1438                                 arg = arg.Substring (0, arg.IndexOf ("//"));\r
1439                         arg = arg.TrimEnd (' ', '\t');\r
1440 \r
1441                         //\r
1442                         // The first group of pre-processing instructions is always processed\r
1443                         //\r
1444                         switch (cmd){\r
1445                         case "pragma":\r
1446                                 if (RootContext.V2)\r
1447                                         return true;\r
1448                                 break;\r
1449                                 \r
1450                         case "line":\r
1451                                 if (!PreProcessLine (arg))\r
1452                                         Report.Error (\r
1453                                                 1576, Location,\r
1454                                                 "Argument to #line directive is missing or invalid");\r
1455                                 return true;\r
1456 \r
1457                         case "region":\r
1458                                 region_directive = true;\r
1459                                 arg = "true";\r
1460                                 goto case "if";\r
1461 \r
1462                         case "endregion":\r
1463                                 region_directive = true;\r
1464                                 goto case "endif";\r
1465                                 \r
1466                         case "if":\r
1467                                 if (arg == ""){\r
1468                                         Error_InvalidDirective ();\r
1469                                         return true;\r
1470                                 }\r
1471                                 bool taking = false;\r
1472                                 if (ifstack == null)\r
1473                                         ifstack = new Stack ();\r
1474 \r
1475                                 if (ifstack.Count == 0){\r
1476                                         taking = true;\r
1477                                 } else {\r
1478                                         int state = (int) ifstack.Peek ();\r
1479                                         if ((state & TAKING) != 0)\r
1480                                                 taking = true;\r
1481                                 }\r
1482 \r
1483                                 if (eval (arg) && taking){\r
1484                                         int push = TAKING | TAKEN_BEFORE | PARENT_TAKING;\r
1485                                         if (region_directive)\r
1486                                                 push |= REGION;\r
1487                                         ifstack.Push (push);\r
1488                                         return true;\r
1489                                 } else {\r
1490                                         int push = (taking ? PARENT_TAKING : 0);\r
1491                                         if (region_directive)\r
1492                                                 push |= REGION;\r
1493                                         ifstack.Push (push);\r
1494                                         return false;\r
1495                                 }\r
1496                                 \r
1497                         case "endif":\r
1498                                 if (ifstack == null || ifstack.Count == 0){\r
1499                                         Error_UnexpectedDirective ("no #if for this #endif");\r
1500                                         return true;\r
1501                                 } else {\r
1502                                         int pop = (int) ifstack.Pop ();\r
1503                                         \r
1504                                         if (region_directive && ((pop & REGION) == 0))\r
1505                                                 Report.Error (1027, Location, "#endif directive expected");\r
1506                                         else if (!region_directive && ((pop & REGION) != 0))\r
1507                                                 Report.Error (1038, Location, "#endregion directive expected");\r
1508                                         \r
1509                                         if (ifstack.Count == 0)\r
1510                                                 return true;\r
1511                                         else {\r
1512                                                 int state = (int) ifstack.Peek ();\r
1513 \r
1514                                                 if ((state & TAKING) != 0)\r
1515                                                         return true;\r
1516                                                 else\r
1517                                                         return false;\r
1518                                         }\r
1519                                 }\r
1520 \r
1521                         case "elif":\r
1522                                 if (ifstack == null || ifstack.Count == 0){\r
1523                                         Error_UnexpectedDirective ("no #if for this #elif");\r
1524                                         return true;\r
1525                                 } else {\r
1526                                         int state = (int) ifstack.Peek ();\r
1527 \r
1528                                         if ((state & REGION) != 0) {\r
1529                                                 Report.Error (1038, Location, "#endregion directive expected");\r
1530                                                 return true;\r
1531                                         }\r
1532 \r
1533                                         if ((state & ELSE_SEEN) != 0){\r
1534                                                 Error_UnexpectedDirective ("#elif not valid after #else");\r
1535                                                 return true;\r
1536                                         }\r
1537 \r
1538                                         if ((state & (TAKEN_BEFORE | TAKING)) != 0)\r
1539                                                 return false;\r
1540 \r
1541                                         if (eval (arg) && ((state & PARENT_TAKING) != 0)){\r
1542                                                 state = (int) ifstack.Pop ();\r
1543                                                 ifstack.Push (state | TAKING | TAKEN_BEFORE);\r
1544                                                 return true;\r
1545                                         } else \r
1546                                                 return false;\r
1547                                 }\r
1548 \r
1549                         case "else":\r
1550                                 if (ifstack == null || ifstack.Count == 0){\r
1551                                         Report.Error (\r
1552                                                 1028, Location,\r
1553                                                 "Unexpected processor directive (no #if for this #else)");\r
1554                                         return true;\r
1555                                 } else {\r
1556                                         int state = (int) ifstack.Peek ();\r
1557 \r
1558                                         if ((state & REGION) != 0) {\r
1559                                                 Report.Error (1038, Location, "#endregion directive expected");\r
1560                                                 return true;\r
1561                                         }\r
1562 \r
1563                                         if ((state & ELSE_SEEN) != 0){\r
1564                                                 Error_UnexpectedDirective ("#else within #else");\r
1565                                                 return true;\r
1566                                         }\r
1567 \r
1568                                         ifstack.Pop ();\r
1569 \r
1570                                         bool ret;\r
1571                                         if ((state & TAKEN_BEFORE) == 0){\r
1572                                                 ret = ((state & PARENT_TAKING) != 0);\r
1573                                         } else\r
1574                                                 ret = false;\r
1575                                         \r
1576                                         if (ret)\r
1577                                                 state |= TAKING;\r
1578                                         else\r
1579                                                 state &= ~TAKING;\r
1580                                         \r
1581                                         ifstack.Push (state | ELSE_SEEN);\r
1582                                         \r
1583                                         return ret;\r
1584                                 }\r
1585                         }\r
1586 \r
1587                         //\r
1588                         // These are only processed if we are in a `taking' block\r
1589                         //\r
1590                         if (!caller_is_taking)\r
1591                                 return false;\r
1592                                         \r
1593                         switch (cmd){\r
1594                         case "define":\r
1595                                 if (any_token_seen){\r
1596                                         Error_TokensSeen ();\r
1597                                         return true;\r
1598                                 }\r
1599                                 PreProcessDefinition (true, arg);\r
1600                                 return true;\r
1601 \r
1602                         case "undef":\r
1603                                 if (any_token_seen){\r
1604                                         Error_TokensSeen ();\r
1605                                         return true;\r
1606                                 }\r
1607                                 PreProcessDefinition (false, arg);\r
1608                                 return true;\r
1609 \r
1610                         case "error":\r
1611                                 Report.Error (1029, Location, "#error: '" + arg + "'");\r
1612                                 return true;\r
1613 \r
1614                         case "warning":\r
1615                                 Report.Warning (1030, Location, "#warning: '" + arg + "'");\r
1616                                 return true;\r
1617                         }\r
1618 \r
1619                         Report.Error (1024, Location, "Preprocessor directive expected (got: " + cmd + ")");\r
1620                         return true;\r
1621 \r
1622                 }\r
1623 \r
1624                 private int consume_string (bool quoted) \r
1625                 {\r
1626                         int c;\r
1627                         string_builder.Length = 0;\r
1628                                                                 \r
1629                         while ((c = getChar ()) != -1){\r
1630                                 if (c == '"'){\r
1631                                         if (quoted && peekChar () == '"'){\r
1632                                                 string_builder.Append ((char) c);\r
1633                                                 getChar ();\r
1634                                                 continue;\r
1635                                         } else {\r
1636                                                 val = string_builder.ToString ();\r
1637                                                 return Token.LITERAL_STRING;\r
1638                                         }\r
1639                                 }\r
1640 \r
1641                                 if (c == '\n'){\r
1642                                         if (!quoted)\r
1643                                                 Report.Error (1010, Location, "Newline in constant");\r
1644                                         line++;\r
1645                                         ref_line++;\r
1646                                         col = 0;\r
1647                                 } else\r
1648                                         col++;\r
1649 \r
1650                                 if (!quoted){\r
1651                                         c = escape (c);\r
1652                                         if (c == -1)\r
1653                                                 return Token.ERROR;\r
1654                                 }\r
1655                                 string_builder.Append ((char) c);\r
1656                         }\r
1657 \r
1658                         Report.Error (1039, Location, "Unterminated string literal");\r
1659                         return Token.EOF;\r
1660                 }\r
1661 \r
1662                 private int consume_identifier (int s, bool quoted) \r
1663                 {\r
1664                         int pos = 1;\r
1665                         int c;\r
1666                         \r
1667                         id_builder [0] = (char) s;\r
1668                                         \r
1669                         while ((c = reader.Read ()) != -1) {\r
1670                                 if (is_identifier_part_character ((char) c)){\r
1671                                         if (pos == max_id_size){\r
1672                                                 Report.Error (645, Location, "Identifier too long (limit is 512 chars)");\r
1673                                                 return Token.ERROR;\r
1674                                         }\r
1675                                         \r
1676                                         id_builder [pos++] = (char) c;\r
1677                                         putback_char = -1;\r
1678                                         col++;\r
1679                                 } else {\r
1680                                         putback_char = c;\r
1681                                         break;\r
1682                                 }\r
1683                         }\r
1684 \r
1685                         //\r
1686                         // Optimization: avoids doing the keyword lookup\r
1687                         // on uppercase letters and _\r
1688                         //\r
1689                         if (s >= 'a'){\r
1690                                 int keyword = GetKeyword (id_builder, pos);\r
1691                                 if (keyword != -1 && !quoted)\r
1692                                         return keyword;\r
1693                         }\r
1694 \r
1695                         //\r
1696                         // Keep identifiers in an array of hashtables to avoid needless\r
1697                         // allocations\r
1698                         //\r
1699 \r
1700                         if (identifiers [pos] != null) {\r
1701                                 val = identifiers [pos][id_builder];\r
1702                                 if (val != null) {\r
1703                                         return Token.IDENTIFIER;\r
1704                                 }\r
1705                         }\r
1706                         else\r
1707                                 identifiers [pos] = new CharArrayHashtable (pos);\r
1708 \r
1709                         val = new String (id_builder, 0, pos);\r
1710 \r
1711                         char [] chars = new char [pos];\r
1712                         Array.Copy (id_builder, chars, pos);\r
1713 \r
1714                         identifiers [pos] [chars] = val;\r
1715 \r
1716                         return Token.IDENTIFIER;\r
1717                 }\r
1718                 \r
1719                 public int xtoken ()\r
1720                 {\r
1721                         int t;\r
1722                         bool doread = false;\r
1723                         int c;\r
1724 \r
1725                         val = null;\r
1726                         // optimization: eliminate col and implement #directive semantic correctly.\r
1727                         for (;(c = getChar ()) != -1; col++) {\r
1728                                 if (c == ' ')\r
1729                                         continue;\r
1730                                 \r
1731                                 if (c == '\t') {\r
1732                                         col = (((col + 8) / 8) * 8) - 1;\r
1733                                         continue;\r
1734                                 }\r
1735                                 \r
1736                                 if (c == ' ' || c == '\f' || c == '\v' || c == 0xa0)\r
1737                                         continue;\r
1738 \r
1739                                 if (c == '\r') {\r
1740                                         if (peekChar () == '\n')\r
1741                                                 getChar ();\r
1742 \r
1743                                         line++;\r
1744                                         ref_line++;\r
1745                                         col = 0;\r
1746                                         any_token_seen |= tokens_seen;\r
1747                                         tokens_seen = false;\r
1748                                         continue;\r
1749                                 }\r
1750 \r
1751                                 // Handle double-slash comments.\r
1752                                 if (c == '/'){\r
1753                                         int d = peekChar ();\r
1754                                 \r
1755                                         if (d == '/'){\r
1756                                                 getChar ();\r
1757                                                 while ((d = getChar ()) != -1 && (d != '\n') && d != '\r')\r
1758                                                         col++;\r
1759                                                 if (d == '\n'){\r
1760                                                         line++;\r
1761                                                         ref_line++;\r
1762                                                         col = 0;\r
1763                                                 }\r
1764                                                 any_token_seen |= tokens_seen;\r
1765                                                 tokens_seen = false;\r
1766                                                 continue;\r
1767                                         } else if (d == '*'){\r
1768                                                 getChar ();\r
1769 \r
1770                                                 while ((d = getChar ()) != -1){\r
1771                                                         if (d == '*' && peekChar () == '/'){\r
1772                                                                 getChar ();\r
1773                                                                 col++;\r
1774                                                                 break;\r
1775                                                         }\r
1776                                                         if (d == '\n'){\r
1777                                                                 line++;\r
1778                                                                 ref_line++;\r
1779                                                                 col = 0;\r
1780                                                                 any_token_seen |= tokens_seen;\r
1781                                                                 tokens_seen = false;\r
1782                                                         }\r
1783                                                 }\r
1784                                                 continue;\r
1785                                         }\r
1786                                         goto is_punct_label;\r
1787                                 }\r
1788 \r
1789                                 \r
1790                                 if (is_identifier_start_character ((char)c)){\r
1791                                         tokens_seen = true;\r
1792                                         return consume_identifier (c, false);\r
1793                                 }\r
1794 \r
1795                         is_punct_label:\r
1796                                 if ((t = is_punct ((char)c, ref doread)) != Token.ERROR){\r
1797                                         tokens_seen = true;\r
1798                                         if (doread){\r
1799                                                 getChar ();\r
1800                                                 col++;\r
1801                                         }\r
1802                                         return t;\r
1803                                 }\r
1804 \r
1805                                 // white space\r
1806                                 if (c == '\n'){\r
1807                                         line++;\r
1808                                         ref_line++;\r
1809                                         col = 0;\r
1810                                         any_token_seen |= tokens_seen;\r
1811                                         tokens_seen = false;\r
1812                                         continue;\r
1813                                 }\r
1814 \r
1815                                 if (c >= '0' && c <= '9'){\r
1816                                         tokens_seen = true;\r
1817                                         return is_number (c);\r
1818                                 }\r
1819 \r
1820                                 if (c == '.'){\r
1821                                         tokens_seen = true;\r
1822                                         int peek = peekChar ();\r
1823                                         if (peek >= '0' && peek <= '9')\r
1824                                                 return is_number (c);\r
1825                                         return Token.DOT;\r
1826                                 }\r
1827                                 \r
1828                                 /* For now, ignore pre-processor commands */\r
1829                                 // FIXME: In C# the '#' is not limited to appear\r
1830                                 // on the first column.\r
1831                                 if (c == '#' && !tokens_seen){\r
1832                                         bool cont = true;\r
1833                                         \r
1834                                 start_again:\r
1835                                         \r
1836                                         cont = handle_preprocessing_directive (cont);\r
1837 \r
1838                                         if (cont){\r
1839                                                 col = 0;\r
1840                                                 continue;\r
1841                                         }\r
1842                                         col = 1;\r
1843 \r
1844                                         bool skipping = false;\r
1845                                         for (;(c = getChar ()) != -1; col++){\r
1846                                                 if (c == '\n'){\r
1847                                                         col = 0;\r
1848                                                         line++;\r
1849                                                         ref_line++;\r
1850                                                         skipping = false;\r
1851                                                 } else if (c == ' ' || c == '\t' || c == '\v' || c == '\r' || c == 0xa0)\r
1852                                                         continue;\r
1853                                                 else if (c != '#')\r
1854                                                         skipping = true;\r
1855                                                 if (c == '#' && !skipping)\r
1856                                                         goto start_again;\r
1857                                         }\r
1858                                         any_token_seen |= tokens_seen;\r
1859                                         tokens_seen = false;\r
1860                                         if (c == -1)\r
1861                                                 Report.Error (1027, Location, "#endif/#endregion expected");\r
1862                                         continue;\r
1863                                 }\r
1864                                 \r
1865                                 if (c == '"') \r
1866                                         return consume_string (false);\r
1867 \r
1868                                 if (c == '\''){\r
1869                                         c = getChar ();\r
1870                                         tokens_seen = true;\r
1871                                         if (c == '\''){\r
1872                                                 error_details = "Empty character literal";\r
1873                                                 Report.Error (1011, Location, error_details);\r
1874                                                 return Token.ERROR;\r
1875                                         }\r
1876                                         c = escape (c);\r
1877                                         if (c == -1)\r
1878                                                 return Token.ERROR;\r
1879                                         val = new System.Char ();\r
1880                                         val = (char) c;\r
1881                                         c = getChar ();\r
1882 \r
1883                                         if (c != '\''){\r
1884                                                 error_details = "Too many characters in character literal";\r
1885                                                 Report.Error (1012, Location, error_details);\r
1886 \r
1887                                                 // Try to recover, read until newline or next "'"\r
1888                                                 while ((c = getChar ()) != -1){\r
1889                                                         if (c == '\n' || c == '\''){\r
1890                                                                 line++;\r
1891                                                                 ref_line++;\r
1892                                                                 col = 0;\r
1893                                                                 break;\r
1894                                                         } else\r
1895                                                                 col++;\r
1896                                                         \r
1897                                                 }\r
1898                                                 return Token.ERROR;\r
1899                                         }\r
1900                                         return Token.LITERAL_CHARACTER;\r
1901                                 }\r
1902                                 \r
1903                                 if (c == '@') {\r
1904                                         c = getChar ();\r
1905                                         if (c == '"') {\r
1906                                                 tokens_seen = true;\r
1907                                                 return consume_string (true);\r
1908                                         } else if (is_identifier_start_character ((char) c)){\r
1909                                                 return consume_identifier (c, true);\r
1910                                         } else {\r
1911                                                 Report.Error (1033, Location, "'@' must be followed by string constant or identifier");\r
1912                                         }\r
1913                                 }\r
1914 \r
1915                                 if (c == '#') {\r
1916                                         error_details = "Preprocessor directives must appear as the first non-whitespace " +\r
1917                                                 "character on a line.";\r
1918 \r
1919                                         Report.Error (1040, Location, error_details);\r
1920 \r
1921                                         return Token.ERROR;\r
1922                                 }\r
1923 \r
1924                                 error_details = ((char)c).ToString ();\r
1925                                 \r
1926                                 return Token.ERROR;\r
1927                         }\r
1928 \r
1929                         return Token.EOF;\r
1930                 }\r
1931 \r
1932                 public void cleanup ()\r
1933                 {\r
1934                         if (ifstack != null && ifstack.Count >= 1) {\r
1935                                 int state = (int) ifstack.Pop ();\r
1936                                 if ((state & REGION) != 0)\r
1937                                         Report.Error (1038, "#endregion directive expected");\r
1938                                 else \r
1939                                         Report.Error (1027, "#endif directive expected");\r
1940                         }\r
1941                                 \r
1942                 }\r
1943         }\r
1944 }\r
1945 \r