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