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 \r
  24 namespace Mono.CSharp\r
  25 {\r
  26         /// <summary>\r
  27         ///    Tokenizer for C# source code. \r
  28         /// </summary>\r
  29 \r
  30         public class Tokenizer : yyParser.yyInput\r
  31         {\r
  32                 StreamReader reader;\r
  33                 public string ref_name;\r
  34                 public int ref_line = 1;\r
  35                 public int line = 1;\r
  36                 public int col = 1;\r
  37                 public int current_token;\r
  38                 bool handle_get_set = false;\r
  39                 bool handle_remove_add = false;\r
  40                 bool handle_assembly = false;\r
  41 \r
  42                 //\r
  43                 // Whether tokens have been seen on this line\r
  44                 //\r
  45                 bool tokens_seen = false;\r
  46                 \r
  47                 //\r
  48                 // Returns a verbose representation of the current location\r
  49                 //\r
  50                 public string location {\r
  51                         get {\r
  52                                 string det;\r
  53 \r
  54                                 if (current_token == Token.ERROR)\r
  55                                         det = "detail: " + error_details;\r
  56                                 else\r
  57                                         det = "";\r
  58                                 \r
  59                                 // return "Line:     "+line+" Col: "+col + "\n" +\r
  60                                 //       "VirtLine: "+ref_line +\r
  61                                 //       " Token: "+current_token + " " + det;\r
  62 \r
  63                                 return ref_name + " " + "(" + line + "," + col + "), Token:" + current_token + " " + det;\r
  64                         }\r
  65                 }\r
  66 \r
  67                 public bool PropertyParsing {\r
  68                         get {\r
  69                                 return handle_get_set;\r
  70                         }\r
  71 \r
  72                         set {\r
  73                                 handle_get_set = value;\r
  74                         }\r
  75                 }\r
  76 \r
  77                 public bool AssemblyTargetParsing {\r
  78                         get {\r
  79                                 return handle_assembly;\r
  80                         }\r
  81 \r
  82                         set {\r
  83                                 handle_assembly = value;\r
  84                         }\r
  85                 }\r
  86 \r
  87                 public bool EventParsing {\r
  88                         get {\r
  89                                 return handle_remove_add;\r
  90                         }\r
  91 \r
  92                         set {\r
  93                                 handle_remove_add = value;\r
  94                         }\r
  95                 }\r
  96                 \r
  97                 //\r
  98                 // Class variables\r
  99                 // \r
 100                 static Hashtable keywords;\r
 101                 static NumberStyles styles;\r
 102                 static NumberFormatInfo csharp_format_info;\r
 103                 \r
 104                 //\r
 105                 // Values for the associated token returned\r
 106                 //\r
 107                 System.Text.StringBuilder number;\r
 108                 int putback_char;\r
 109                 Object val;\r
 110 \r
 111                 //\r
 112                 // Pre-processor\r
 113                 //\r
 114                 Hashtable defines;\r
 115 \r
 116                 const int TAKING        = 1;\r
 117                 const int TAKEN_BEFORE  = 2;\r
 118                 const int ELSE_SEEN     = 4;\r
 119                 const int PARENT_TAKING = 8;\r
 120                 \r
 121                 //\r
 122                 // pre-processor if stack state:\r
 123                 //\r
 124                 Stack ifstack;\r
 125                 \r
 126                 //\r
 127                 // Details about the error encoutered by the tokenizer\r
 128                 //\r
 129                 string error_details;\r
 130                 \r
 131                 public string error {\r
 132                         get {\r
 133                                 return error_details;\r
 134                         }\r
 135                 }\r
 136                 \r
 137                 public int Line {\r
 138                         get {\r
 139                                 return line;\r
 140                         }\r
 141                 }\r
 142 \r
 143                 public int Col {\r
 144                         get {\r
 145                                 return col;\r
 146                         }\r
 147                 }\r
 148                 \r
 149                 static void InitTokens ()\r
 150                 {\r
 151                         keywords = new Hashtable ();\r
 152 \r
 153                         keywords.Add ("abstract", Token.ABSTRACT);\r
 154                         keywords.Add ("as", Token.AS);\r
 155                         keywords.Add ("add", Token.ADD);\r
 156                         keywords.Add ("assembly", Token.ASSEMBLY);\r
 157                         keywords.Add ("base", Token.BASE);\r
 158                         keywords.Add ("bool", Token.BOOL);\r
 159                         keywords.Add ("break", Token.BREAK);\r
 160                         keywords.Add ("byte", Token.BYTE);\r
 161                         keywords.Add ("case", Token.CASE);\r
 162                         keywords.Add ("catch", Token.CATCH);\r
 163                         keywords.Add ("char", Token.CHAR);\r
 164                         keywords.Add ("checked", Token.CHECKED);\r
 165                         keywords.Add ("class", Token.CLASS);\r
 166                         keywords.Add ("const", Token.CONST);\r
 167                         keywords.Add ("continue", Token.CONTINUE);\r
 168                         keywords.Add ("decimal", Token.DECIMAL);\r
 169                         keywords.Add ("default", Token.DEFAULT);\r
 170                         keywords.Add ("delegate", Token.DELEGATE);\r
 171                         keywords.Add ("do", Token.DO);\r
 172                         keywords.Add ("double", Token.DOUBLE);\r
 173                         keywords.Add ("else", Token.ELSE);\r
 174                         keywords.Add ("enum", Token.ENUM);\r
 175                         keywords.Add ("event", Token.EVENT);\r
 176                         keywords.Add ("explicit", Token.EXPLICIT);\r
 177                         keywords.Add ("extern", Token.EXTERN);\r
 178                         keywords.Add ("false", Token.FALSE);\r
 179                         keywords.Add ("finally", Token.FINALLY);\r
 180                         keywords.Add ("fixed", Token.FIXED);\r
 181                         keywords.Add ("float", Token.FLOAT);\r
 182                         keywords.Add ("for", Token.FOR);\r
 183                         keywords.Add ("foreach", Token.FOREACH);\r
 184                         keywords.Add ("goto", Token.GOTO);\r
 185                         keywords.Add ("get", Token.GET);\r
 186                         keywords.Add ("if", Token.IF);\r
 187                         keywords.Add ("implicit", Token.IMPLICIT);\r
 188                         keywords.Add ("in", Token.IN);\r
 189                         keywords.Add ("int", Token.INT);\r
 190                         keywords.Add ("interface", Token.INTERFACE);\r
 191                         keywords.Add ("internal", Token.INTERNAL);\r
 192                         keywords.Add ("is", Token.IS);\r
 193                         keywords.Add ("lock", Token.LOCK);\r
 194                         keywords.Add ("long", Token.LONG);\r
 195                         keywords.Add ("namespace", Token.NAMESPACE);\r
 196                         keywords.Add ("new", Token.NEW);\r
 197                         keywords.Add ("null", Token.NULL);\r
 198                         keywords.Add ("object", Token.OBJECT);\r
 199                         keywords.Add ("operator", Token.OPERATOR);\r
 200                         keywords.Add ("out", Token.OUT);\r
 201                         keywords.Add ("override", Token.OVERRIDE);\r
 202                         keywords.Add ("params", Token.PARAMS);\r
 203                         keywords.Add ("private", Token.PRIVATE);\r
 204                         keywords.Add ("protected", Token.PROTECTED);\r
 205                         keywords.Add ("public", Token.PUBLIC);\r
 206                         keywords.Add ("readonly", Token.READONLY);\r
 207                         keywords.Add ("ref", Token.REF);\r
 208                         keywords.Add ("remove", Token.REMOVE);\r
 209                         keywords.Add ("return", Token.RETURN);\r
 210                         keywords.Add ("sbyte", Token.SBYTE);\r
 211                         keywords.Add ("sealed", Token.SEALED);\r
 212                         keywords.Add ("set", Token.SET);\r
 213                         keywords.Add ("short", Token.SHORT);\r
 214                         keywords.Add ("sizeof", Token.SIZEOF);\r
 215                         keywords.Add ("stackalloc", Token.STACKALLOC);\r
 216                         keywords.Add ("static", Token.STATIC);\r
 217                         keywords.Add ("string", Token.STRING);\r
 218                         keywords.Add ("struct", Token.STRUCT);\r
 219                         keywords.Add ("switch", Token.SWITCH);\r
 220                         keywords.Add ("this", Token.THIS);\r
 221                         keywords.Add ("throw", Token.THROW);\r
 222                         keywords.Add ("true", Token.TRUE);\r
 223                         keywords.Add ("try", Token.TRY);\r
 224                         keywords.Add ("typeof", Token.TYPEOF);\r
 225                         keywords.Add ("uint", Token.UINT);\r
 226                         keywords.Add ("ulong", Token.ULONG);\r
 227                         keywords.Add ("unchecked", Token.UNCHECKED);\r
 228                         keywords.Add ("unsafe", Token.UNSAFE);\r
 229                         keywords.Add ("ushort", Token.USHORT);\r
 230                         keywords.Add ("using", Token.USING);\r
 231                         keywords.Add ("virtual", Token.VIRTUAL);\r
 232                         keywords.Add ("void", Token.VOID);\r
 233                         keywords.Add ("volatile", Token.VOLATILE);\r
 234                         keywords.Add ("while", Token.WHILE);\r
 235                 }\r
 236 \r
 237                 //\r
 238                 // Class initializer\r
 239                 // \r
 240                 static Tokenizer ()\r
 241                 {\r
 242                         InitTokens ();\r
 243                         csharp_format_info = new NumberFormatInfo ();\r
 244                         csharp_format_info.CurrencyDecimalSeparator = ".";\r
 245                         styles = NumberStyles.AllowExponent | NumberStyles.AllowDecimalPoint;\r
 246                 }\r
 247 \r
 248                 bool is_keyword (string name)\r
 249                 {\r
 250                         bool res;\r
 251                         \r
 252                         res = keywords.Contains (name);\r
 253                         if (handle_get_set == false && (name == "get" || name == "set"))\r
 254                                 return false;\r
 255                         if (handle_remove_add == false && (name == "remove" || name == "add"))\r
 256                                 return false;\r
 257                         if (handle_assembly == false && (name == "assembly"))\r
 258                                 return false;\r
 259                         return res;\r
 260                 }\r
 261 \r
 262                 int GetKeyword (string name)\r
 263                 {\r
 264                         return (int) (keywords [name]);\r
 265                 }\r
 266 \r
 267                 public Location Location {\r
 268                         get {\r
 269                                 return new Location (ref_line);\r
 270                         }\r
 271                 }\r
 272                 \r
 273                 public Tokenizer (System.IO.Stream input, string fname, ArrayList defs)\r
 274                 {\r
 275                         this.ref_name = fname;\r
 276                         reader = new System.IO.StreamReader (input);\r
 277                         putback_char = -1;\r
 278 \r
 279                         if (defs != null){\r
 280                                 defines = new Hashtable ();\r
 281                                 foreach (string def in defs)\r
 282                                         defines [def] = true;\r
 283                         }\r
 284 \r
 285                         //\r
 286                         // FIXME: This could be `Location.Push' but we have to\r
 287                         // find out why the MS compiler allows this\r
 288                         //\r
 289                         Mono.CSharp.Location.Push (fname);\r
 290                 }\r
 291 \r
 292                 bool is_identifier_start_character (char c)\r
 293                 {\r
 294                         return Char.IsLetter (c) || c == '_' ;\r
 295                 }\r
 296 \r
 297                 bool is_identifier_part_character (char c)\r
 298                 {\r
 299                         return (Char.IsLetter (c) || Char.IsDigit (c) || c == '_');\r
 300                 }\r
 301 \r
 302                 int is_punct (char c, ref bool doread)\r
 303                 {\r
 304                         int d;\r
 305                         int t;\r
 306 \r
 307                         doread = false;\r
 308 \r
 309                         switch (c){\r
 310                         case '{':\r
 311                                 return Token.OPEN_BRACE;\r
 312                         case '}':\r
 313                                 return Token.CLOSE_BRACE;\r
 314                         case '[':\r
 315                                 return Token.OPEN_BRACKET;\r
 316                         case ']':\r
 317                                 return Token.CLOSE_BRACKET;\r
 318                         case '(':\r
 319                                 return Token.OPEN_PARENS;\r
 320                         case ')':\r
 321                                 return Token.CLOSE_PARENS;\r
 322                         case ',':\r
 323                                 return Token.COMMA;\r
 324                         case ':':\r
 325                                 return Token.COLON;\r
 326                         case ';':\r
 327                                 return Token.SEMICOLON;\r
 328                         case '~':\r
 329                                 return Token.TILDE;\r
 330                         case '?':\r
 331                                 return Token.INTERR;\r
 332                         }\r
 333 \r
 334                         d = peekChar ();\r
 335                         if (c == '+'){\r
 336                                 \r
 337                                 if (d == '+')\r
 338                                         t = Token.OP_INC;\r
 339                                 else if (d == '=')\r
 340                                         t = Token.OP_ADD_ASSIGN;\r
 341                                 else\r
 342                                         return Token.PLUS;\r
 343                                 doread = true;\r
 344                                 return t;\r
 345                         }\r
 346                         if (c == '-'){\r
 347                                 if (d == '-')\r
 348                                         t = Token.OP_DEC;\r
 349                                 else if (d == '=')\r
 350                                         t = Token.OP_SUB_ASSIGN;\r
 351                                 else if (d == '>')\r
 352                                         t = Token.OP_PTR;\r
 353                                 else\r
 354                                         return Token.MINUS;\r
 355                                 doread = true;\r
 356                                 return t;\r
 357                         }\r
 358 \r
 359                         if (c == '!'){\r
 360                                 if (d == '='){\r
 361                                         doread = true;\r
 362                                         return Token.OP_NE;\r
 363                                 }\r
 364                                 return Token.BANG;\r
 365                         }\r
 366 \r
 367                         if (c == '='){\r
 368                                 if (d == '='){\r
 369                                         doread = true;\r
 370                                         return Token.OP_EQ;\r
 371                                 }\r
 372                                 return Token.ASSIGN;\r
 373                         }\r
 374 \r
 375                         if (c == '&'){\r
 376                                 if (d == '&'){\r
 377                                         doread = true;\r
 378                                         return Token.OP_AND;\r
 379                                 } else if (d == '='){\r
 380                                         doread = true;\r
 381                                         return Token.OP_AND_ASSIGN;\r
 382                                 }\r
 383                                 return Token.BITWISE_AND;\r
 384                         }\r
 385 \r
 386                         if (c == '|'){\r
 387                                 if (d == '|'){\r
 388                                         doread = true;\r
 389                                         return Token.OP_OR;\r
 390                                 } else if (d == '='){\r
 391                                         doread = true;\r
 392                                         return Token.OP_OR_ASSIGN;\r
 393                                 }\r
 394                                 return Token.BITWISE_OR;\r
 395                         }\r
 396 \r
 397                         if (c == '*'){\r
 398                                 if (d == '='){\r
 399                                         doread = true;\r
 400                                         return Token.OP_MULT_ASSIGN;\r
 401                                 }\r
 402                                 return Token.STAR;\r
 403                         }\r
 404 \r
 405                         if (c == '/'){\r
 406                                 if (d == '='){\r
 407                                         doread = true;\r
 408                                         return Token.OP_DIV_ASSIGN;\r
 409                                 }\r
 410                                 return Token.DIV;\r
 411                         }\r
 412 \r
 413                         if (c == '%'){\r
 414                                 if (d == '='){\r
 415                                         doread = true;\r
 416                                         return Token.OP_MOD_ASSIGN;\r
 417                                 }\r
 418                                 return Token.PERCENT;\r
 419                         }\r
 420 \r
 421                         if (c == '^'){\r
 422                                 if (d == '='){\r
 423                                         doread = true;\r
 424                                         return Token.OP_XOR_ASSIGN;\r
 425                                 }\r
 426                                 return Token.CARRET;\r
 427                         }\r
 428 \r
 429                         if (c == '<'){\r
 430                                 if (d == '<'){\r
 431                                         getChar ();\r
 432                                         d = peekChar ();\r
 433 \r
 434                                         if (d == '='){\r
 435                                                 doread = true;\r
 436                                                 return Token.OP_SHIFT_LEFT_ASSIGN;\r
 437                                         }\r
 438                                         return Token.OP_SHIFT_LEFT;\r
 439                                 } else if (d == '='){\r
 440                                         doread = true;\r
 441                                         return Token.OP_LE;\r
 442                                 }\r
 443                                 return Token.OP_LT;\r
 444                         }\r
 445 \r
 446                         if (c == '>'){\r
 447                                 if (d == '>'){\r
 448                                         getChar ();\r
 449                                         d = peekChar ();\r
 450 \r
 451                                         if (d == '='){\r
 452                                                 doread = true;\r
 453                                                 return Token.OP_SHIFT_RIGHT_ASSIGN;\r
 454                                         }\r
 455                                         return Token.OP_SHIFT_RIGHT;\r
 456                                 } else if (d == '='){\r
 457                                         doread = true;\r
 458                                         return Token.OP_GE;\r
 459                                 }\r
 460                                 return Token.OP_GT;\r
 461                         }\r
 462                         return Token.ERROR;\r
 463                 }\r
 464 \r
 465                 bool decimal_digits (int c)\r
 466                 {\r
 467                         int d;\r
 468                         bool seen_digits = false;\r
 469                         \r
 470                         if (c != -1)\r
 471                                 number.Append ((char) c);\r
 472                         \r
 473                         while ((d = peekChar ()) != -1){\r
 474                                 if (Char.IsDigit ((char)d)){\r
 475                                         number.Append ((char) d);\r
 476                                         getChar ();\r
 477                                         seen_digits = true;\r
 478                                 } else\r
 479                                         break;\r
 480                         }\r
 481                         \r
 482                         return seen_digits;\r
 483                 }\r
 484 \r
 485                 void hex_digits (int c)\r
 486                 {\r
 487                         int d;\r
 488 \r
 489                         if (c != -1)\r
 490                                 number.Append ((char) c);\r
 491                         while ((d = peekChar ()) != -1){\r
 492                                 char e = Char.ToUpper ((char) d);\r
 493                                 \r
 494                                 if (Char.IsDigit (e) || (e >= 'A' && e <= 'F')){\r
 495                                         number.Append ((char) e);\r
 496                                         getChar ();\r
 497                                 } else\r
 498                                         break;\r
 499                         }\r
 500                 }\r
 501                 \r
 502                 int real_type_suffix (int c)\r
 503                 {\r
 504                         int t;\r
 505 \r
 506                         switch (c){\r
 507                         case 'F': case 'f':\r
 508                                 t =  Token.LITERAL_FLOAT;\r
 509                                 break;\r
 510                         case 'D': case 'd':\r
 511                                 t = Token.LITERAL_DOUBLE;\r
 512                                 break;\r
 513                         case 'M': case 'm':\r
 514                                  t= Token.LITERAL_DECIMAL;\r
 515                                 break;\r
 516                         default:\r
 517                                 return Token.NONE;\r
 518                         }\r
 519                         return t;\r
 520                 }\r
 521 \r
 522                 int integer_type_suffix (ulong ul, int c)\r
 523                 {\r
 524                         bool is_unsigned = false;\r
 525                         bool is_long = false;\r
 526 \r
 527                         if (c != -1){\r
 528                                 bool scanning = true;\r
 529                                 do {\r
 530                                         switch (c){\r
 531                                         case 'U': case 'u':\r
 532                                                 if (is_unsigned)\r
 533                                                         scanning = false;\r
 534                                                 is_unsigned = true;\r
 535                                                 getChar ();\r
 536                                                 break;\r
 537 \r
 538                                         case 'l':\r
 539                                                 if (!is_unsigned){\r
 540                                                         //\r
 541                                                         // if we have not seen anything in between\r
 542                                                         // report this error\r
 543                                                         //\r
 544                                                         Report.Warning (\r
 545                                                                 78, Location,\r
 546                                                         "the 'l' suffix is easily confused with digit `1'," +\r
 547                                                         " use 'L' for clarity");\r
 548                                                 }\r
 549                                                 goto case 'L';\r
 550                                                 \r
 551                                         case 'L': \r
 552                                                 if (is_long)\r
 553                                                         scanning = false;\r
 554                                                 is_long = true;\r
 555                                                 getChar ();\r
 556                                                 break;\r
 557                                                 \r
 558                                         default:\r
 559                                                 scanning = false;\r
 560                                                 break;\r
 561                                         }\r
 562                                         c = peekChar ();\r
 563                                 } while (scanning);\r
 564                         }\r
 565 \r
 566                         if (is_long && is_unsigned){\r
 567                                 val = ul;\r
 568                                 return Token.LITERAL_INTEGER;\r
 569                         } else if (is_unsigned){\r
 570                                 // uint if possible, or ulong else.\r
 571 \r
 572                                 if ((ul & 0xffffffff00000000) == 0)\r
 573                                         val = (uint) ul;\r
 574                                 else\r
 575                                         val = ul;\r
 576                         } else if (is_long){\r
 577                                 // long if possible, ulong otherwise\r
 578                                 if ((ul & 0x8000000000000000) != 0)\r
 579                                         val = ul;\r
 580                                 else\r
 581                                         val = (long) ul;\r
 582                         } else {\r
 583                                 // int, uint, long or ulong in that order\r
 584                                 if ((ul & 0xffffffff00000000) == 0){\r
 585                                         uint ui = (uint) ul;\r
 586                                         \r
 587                                         if ((ui & 0x80000000) != 0)\r
 588                                                 val = ui;\r
 589                                         else\r
 590                                                 val = (int) ui;\r
 591                                 } else {\r
 592                                         if ((ul & 0x8000000000000000) != 0)\r
 593                                                 val = ul;\r
 594                                         else\r
 595                                                 val = (long) ul;\r
 596                                 }\r
 597                         }\r
 598                         return Token.LITERAL_INTEGER;\r
 599                 }\r
 600                                 \r
 601                 //\r
 602                 // given `c' as the next char in the input decide whether\r
 603                 // we need to convert to a special type, and then choose\r
 604                 // the best representation for the integer\r
 605                 //\r
 606                 int adjust_int (int c)\r
 607                 {\r
 608                         ulong ul = System.UInt64.Parse (number.ToString ());\r
 609                         return integer_type_suffix (ul, c);\r
 610                 }\r
 611 \r
 612                 int adjust_real (int t)\r
 613                 {\r
 614                         string s = number.ToString ();\r
 615 \r
 616                         switch (t){\r
 617                         case Token.LITERAL_DECIMAL:\r
 618                                 val = new System.Decimal ();\r
 619                                 val = System.Decimal.Parse (\r
 620                                         s, styles, csharp_format_info);\r
 621                                 break;\r
 622                         case Token.LITERAL_DOUBLE:\r
 623                                 val = new System.Double ();\r
 624                                 val = System.Double.Parse (\r
 625                                         s, styles, csharp_format_info);\r
 626                                 break;\r
 627                         case Token.LITERAL_FLOAT:\r
 628                                 val = new System.Double ();\r
 629                                 val = (float) System.Double.Parse (\r
 630                                         s, styles, csharp_format_info);\r
 631                                 break;\r
 632 \r
 633                         case Token.NONE:\r
 634                                 val = new System.Double ();\r
 635                                 val = System.Double.Parse (\r
 636                                         s, styles, csharp_format_info);\r
 637                                 t = Token.LITERAL_DOUBLE;\r
 638                                 break;\r
 639                         }\r
 640                         return t;\r
 641                 }\r
 642 \r
 643                 //\r
 644                 // Invoked if we know we have .digits or digits\r
 645                 //\r
 646                 int is_number (int c)\r
 647                 {\r
 648                         bool is_real = false;\r
 649                         number = new System.Text.StringBuilder ();\r
 650                         int type;\r
 651 \r
 652                         number.Length = 0;\r
 653 \r
 654                         if (Char.IsDigit ((char)c)){\r
 655                                 if (c == '0' && peekChar () == 'x' || peekChar () == 'X'){\r
 656                                         ulong ul;\r
 657                                         getChar ();\r
 658                                         hex_digits (-1);\r
 659 \r
 660                                         string s = number.ToString ();\r
 661 \r
 662                                         ul = System.UInt64.Parse (s, NumberStyles.HexNumber);\r
 663                                         return integer_type_suffix (ul, peekChar ());\r
 664                                 }\r
 665                                 decimal_digits (c);\r
 666                                 c = getChar ();\r
 667                         }\r
 668 \r
 669                         //\r
 670                         // We need to handle the case of\r
 671                         // "1.1" vs "1.string" (LITERAL_FLOAT vs NUMBER DOT IDENTIFIER)\r
 672                         //\r
 673                         if (c == '.'){\r
 674                                 if (decimal_digits ('.')){\r
 675                                         is_real = true;\r
 676                                         c = getChar ();\r
 677                                 } else {\r
 678                                         putback ('.');\r
 679                                         number.Length -= 1;\r
 680                                         return adjust_int (-1);\r
 681                                 }\r
 682                         }\r
 683                         \r
 684                         if (c == 'e' || c == 'E'){\r
 685                                 is_real = true;\r
 686                                 number.Append ("e");\r
 687                                 c = getChar ();\r
 688                                 \r
 689                                 if (c == '+'){\r
 690                                         number.Append ((char) c);\r
 691                                         c = getChar ();\r
 692                                 } else if (c == '-'){\r
 693                                         number.Append ((char) c);\r
 694                                         c = getChar ();\r
 695                                 }\r
 696                                 decimal_digits (-1);\r
 697                                 c = getChar ();\r
 698                         }\r
 699 \r
 700                         type = real_type_suffix (c);\r
 701                         if (type == Token.NONE && !is_real){\r
 702                                 putback (c);\r
 703                                 return adjust_int (c);\r
 704                         } else \r
 705                                 is_real = true;\r
 706 \r
 707                         if (type == Token.NONE){\r
 708                                 putback (c);\r
 709                         }\r
 710                         \r
 711                         if (is_real)\r
 712                                 return adjust_real (type);\r
 713 \r
 714                         Console.WriteLine ("This should not be reached");\r
 715                         throw new Exception ("Is Number should never reach this point");\r
 716                 }\r
 717                         \r
 718                 int escape (int c)\r
 719                 {\r
 720                         int d;\r
 721                         int v;\r
 722 \r
 723                         d = peekChar ();\r
 724                         if (c != '\\')\r
 725                                 return c;\r
 726                         \r
 727                         switch (d){\r
 728                         case 'a':\r
 729                                 v = '\a'; break;\r
 730                         case 'b':\r
 731                                 v = '\b'; break;\r
 732                         case 'n':\r
 733                                 v = '\n'; break;\r
 734                         case 't':\r
 735                                 v = '\t'; break;\r
 736                         case 'v':\r
 737                                 v = '\v'; break;\r
 738                         case 'r':\r
 739                                 v = '\r'; break;\r
 740                         case '\\':\r
 741                                 v = '\\'; break;\r
 742                         case 'f':\r
 743                                 v = '\f'; break;\r
 744                         case '0':\r
 745                                 v = 0; break;\r
 746                         case '"':\r
 747                                 v = '"'; break;\r
 748                         case '\'':\r
 749                                 v = '\''; break;\r
 750                         default:\r
 751                                 error_details = "cs1009: Unrecognized escape sequence " + (char)d;\r
 752                                 return -1;\r
 753                         }\r
 754                         getChar ();\r
 755                         return v;\r
 756                 }\r
 757 \r
 758                 int getChar ()\r
 759                 {\r
 760                         if (putback_char != -1){\r
 761                                 int x = putback_char;\r
 762                                 putback_char = -1;\r
 763 \r
 764                                 return x;\r
 765                         }\r
 766                         return reader.Read ();\r
 767                 }\r
 768 \r
 769                 int peekChar ()\r
 770                 {\r
 771                         if (putback_char != -1)\r
 772                                 return putback_char;\r
 773                         return reader.Peek ();\r
 774                 }\r
 775 \r
 776                 void putback (int c)\r
 777                 {\r
 778                         if (putback_char != -1)\r
 779                                 throw new Exception ("This should not happen putback on putback");\r
 780                         putback_char = c;\r
 781                 }\r
 782 \r
 783                 public bool advance ()\r
 784                 {\r
 785                         return peekChar () != -1;\r
 786                 }\r
 787 \r
 788                 public Object Value {\r
 789                         get {\r
 790                                 return val;\r
 791                         }\r
 792                 }\r
 793 \r
 794                 public Object value ()\r
 795                 {\r
 796                         return val;\r
 797                 }\r
 798                 \r
 799                 public int token ()\r
 800                 {\r
 801                         current_token = xtoken ();\r
 802                         return current_token;\r
 803                 }\r
 804 \r
 805                 static StringBuilder static_cmd_arg = new System.Text.StringBuilder ();\r
 806                 \r
 807                 void get_cmd_arg (out string cmd, out string arg)\r
 808                 {\r
 809                         int c;\r
 810                         \r
 811                         tokens_seen = false;\r
 812                         arg = "";\r
 813                         static_cmd_arg.Length = 0;\r
 814                                 \r
 815                         while ((c = getChar ()) != -1 && (c != '\n') && ((c != ' ') || c == '\t')){\r
 816                                 if (c == '\r')\r
 817                                         continue;\r
 818                                 static_cmd_arg.Append ((char) c);\r
 819                         }\r
 820 \r
 821                         cmd = static_cmd_arg.ToString ();\r
 822 \r
 823                         if (c == '\n'){\r
 824                                 line++;\r
 825                                 ref_line++;\r
 826                                 return;\r
 827                         }\r
 828 \r
 829                         // skip over white space\r
 830                         while ((c = getChar ()) != -1 && (c != '\n') && ((c == ' ') || (c == '\t')))\r
 831                                 ;\r
 832 \r
 833                         if (c == '\n'){\r
 834                                 line++;\r
 835                                 ref_line++;\r
 836                                 return;\r
 837                         }\r
 838                         \r
 839                         static_cmd_arg.Length = 0;\r
 840                         static_cmd_arg.Append ((char) c);\r
 841                         \r
 842                         while ((c = getChar ()) != -1 && (c != '\n')){\r
 843                                 if (c == '\r')\r
 844                                         continue;\r
 845                                 static_cmd_arg.Append ((char) c);\r
 846                         }\r
 847 \r
 848                         if (c == '\n'){\r
 849                                 line++;\r
 850                                 ref_line++;\r
 851                         }\r
 852                         arg = static_cmd_arg.ToString ().Trim ();\r
 853                 }\r
 854 \r
 855                 //\r
 856                 // Handles the #line directive\r
 857                 //\r
 858                 bool PreProcessLine (string arg)\r
 859                 {\r
 860                         if (arg == "")\r
 861                                 return false;\r
 862 \r
 863                         if (arg == "default"){\r
 864                                 line = ref_line = line;\r
 865                                 return false;\r
 866                         }\r
 867                         \r
 868                         try {\r
 869                                 int pos;\r
 870 \r
 871                                 if ((pos = arg.IndexOf (' ')) != -1 && pos != 0){\r
 872                                         ref_line = System.Int32.Parse (arg.Substring (0, pos));\r
 873                                         pos++;\r
 874                                         \r
 875                                         char [] quotes = { '\"' };\r
 876                                         \r
 877                                         ref_name = arg.Substring (pos);\r
 878                                         ref_name.TrimStart (quotes);\r
 879                                         ref_name.TrimEnd (quotes);\r
 880                                 } else {\r
 881                                         ref_line = System.Int32.Parse (arg);\r
 882                                 }\r
 883                         } catch {\r
 884                                 return false;\r
 885                         }\r
 886                         \r
 887                         return true;\r
 888                 }\r
 889 \r
 890                 //\r
 891                 // Handles #define and #undef\r
 892                 //\r
 893                 void PreProcessDefinition (bool is_define, string arg)\r
 894                 {\r
 895                         if (arg == "" || arg == "true" || arg == "false"){\r
 896                                 Report.Error(1001, Location, "Missing identifer to pre-processor directive");\r
 897                                 return;\r
 898                         }\r
 899 \r
 900                         if (is_define){\r
 901                                 if (defines == null)\r
 902                                         defines = new Hashtable ();\r
 903                                 defines [arg] = 1;\r
 904                         } else {\r
 905                                 if (defines == null)\r
 906                                         return;\r
 907                                 if (defines.Contains (arg))\r
 908                                         defines.Remove (arg);\r
 909                         }\r
 910                 }\r
 911 \r
 912                 bool eval_val (string s)\r
 913                 {\r
 914                         if (s == "true")\r
 915                                 return true;\r
 916                         if (s == "false")\r
 917                                 return false;\r
 918                         \r
 919                         if (defines == null)\r
 920                                 return false;\r
 921                         if (defines.Contains (s))\r
 922                                 return true;\r
 923 \r
 924                         return false;\r
 925                 }\r
 926 \r
 927                 bool pp_primary (ref string s)\r
 928                 {\r
 929                         s.Trim ();\r
 930                         int len = s.Length;\r
 931 \r
 932                         if (len > 0){\r
 933                                 char c = s [0];\r
 934                                 \r
 935                                 if (c == '('){\r
 936                                         s = s.Substring (1);\r
 937                                         bool val = pp_expr (ref s);\r
 938                                         if (s.Length > 0 && s [0] == ')')\r
 939                                                 return val;\r
 940                                         report1517 ();\r
 941                                         return false;\r
 942                                 }\r
 943                                 \r
 944                                 if (Char.IsLetter (c) || c == '_'){\r
 945                                         int j = 1;\r
 946 \r
 947                                         while (j < len){\r
 948                                                 c = s [j];\r
 949                                                 \r
 950                                                 if (Char.IsLetter (c) || Char.IsDigit (c) || c == '_'){\r
 951                                                         j++;\r
 952                                                         continue;\r
 953                                                 }\r
 954                                                 bool v = eval_val (s.Substring (0, j));\r
 955                                                 s = s.Substring (j);\r
 956                                                 return v;\r
 957                                         }\r
 958                                         bool vv = eval_val (s);\r
 959                                         s = "";\r
 960                                         return vv;\r
 961                                 }\r
 962                         }\r
 963                         report1517 ();\r
 964                         return false;\r
 965                 }\r
 966                 \r
 967                 bool pp_unary (ref string s)\r
 968                 {\r
 969                         s = s.Trim ();\r
 970                         int len = s.Length;\r
 971 \r
 972                         if (len > 0){\r
 973                                 if (s [0] == '!'){\r
 974                                         if (len > 1 && s [1] == '='){\r
 975                                                 report1517 ();\r
 976                                                 return false;\r
 977                                         }\r
 978                                         s = s.Substring (1);\r
 979                                         return ! pp_primary (ref s);\r
 980                                 } else\r
 981                                         return pp_primary (ref s);\r
 982                         } else {\r
 983                                 report1517 ();\r
 984                                 return false;\r
 985                         }\r
 986                 }\r
 987                 \r
 988                 bool pp_eq (ref string s)\r
 989                 {\r
 990                         bool va = pp_unary (ref s);\r
 991 \r
 992                         s = s.Trim ();\r
 993                         int len = s.Length;\r
 994                         if (len > 0){\r
 995                                 if (s [0] == '='){\r
 996                                         if (len > 2 && s [1] == '='){\r
 997                                                 s = s.Substring (2);\r
 998                                                 return va == pp_unary (ref s);\r
 999                                         } else {\r
1000                                                 report1517 ();\r
1001                                                 return false;\r
1002                                         }\r
1003                                 } else if (s [0] == '!' && len > 1 && s [1] == '='){\r
1004                                         s = s.Substring (2);\r
1005 \r
1006                                         return va != pp_unary (ref s);\r
1007 \r
1008                                 }\r
1009                         }\r
1010 \r
1011                         return va;\r
1012                                 \r
1013                 }\r
1014                 \r
1015                 bool pp_and (ref string s)\r
1016                 {\r
1017                         bool va = pp_eq (ref s);\r
1018 \r
1019                         s = s.Trim ();\r
1020                         int len = s.Length;\r
1021                         if (len > 0){\r
1022                                 if (s [0] == '&'){\r
1023                                         if (len > 2 && s [1] == '&'){\r
1024                                                 s = s.Substring (2);\r
1025                                                 return va && pp_eq (ref s);\r
1026                                         } else {\r
1027                                                 report1517 ();\r
1028                                                 return false;\r
1029                                         }\r
1030                                 } \r
1031                         }\r
1032                         return va;\r
1033                 }\r
1034                 \r
1035                 //\r
1036                 // Evaluates an expression for `#if' or `#elif'\r
1037                 //\r
1038                 bool pp_expr (ref string s)\r
1039                 {\r
1040                         bool va = pp_and (ref s);\r
1041 \r
1042                         s = s.Trim ();\r
1043                         int len = s.Length;\r
1044                         if (len > 0){\r
1045                                 if (s [0] == '|'){\r
1046                                         if (len > 2 && s [1] == '|'){\r
1047                                                 s = s.Substring (2);\r
1048                                                 return va || pp_and (ref s);\r
1049                                         } else {\r
1050                                                 report1517 ();\r
1051                                                 return false;\r
1052                                         }\r
1053                                 } else {\r
1054                                         report1517 ();\r
1055                                         return false;\r
1056                                 }\r
1057                         }\r
1058 \r
1059                         return va;\r
1060                 }\r
1061 \r
1062                 bool eval (string s)\r
1063                 {\r
1064                         bool v = pp_expr (ref s);\r
1065 \r
1066                         return v;\r
1067                 }\r
1068                 \r
1069                 void report1517 ()\r
1070                 {\r
1071                         Report.Error (1517, Location, "Invalid pre-processor directive");\r
1072                 }\r
1073 \r
1074                 void report1028 (string extra)\r
1075                 {\r
1076                         Report.Error (\r
1077                                 1028, Location,\r
1078                                 "Unexpected processor directive (" + extra + ")");\r
1079                 }\r
1080                 \r
1081                 //\r
1082                 // if true, then the code continues processing the code\r
1083                 // if false, the code stays in a loop until another directive is\r
1084                 // reached.\r
1085                 //\r
1086                 bool handle_preprocessing_directive ()\r
1087                 {\r
1088                         char [] blank = { ' ', '\t' };\r
1089                         string cmd, arg;\r
1090                         \r
1091                         get_cmd_arg (out cmd, out arg);\r
1092                         \r
1093                         switch (cmd){\r
1094                         case "line":\r
1095                                 if (!PreProcessLine (arg))\r
1096                                         Report.Error (\r
1097                                                 1576, Location,\r
1098                                                 "Argument to #line directive is missing or invalid");\r
1099                                 return true;\r
1100 \r
1101                         case "define":\r
1102                                 PreProcessDefinition (true, arg);\r
1103                                 return true;\r
1104 \r
1105                         case "undef":\r
1106                                 PreProcessDefinition (false, arg);\r
1107                                 return true;\r
1108 \r
1109                         case "error":\r
1110                                 Report.Error (1029, Location, "#error: '" + arg + "'");\r
1111                                 return true;\r
1112 \r
1113                         case "warning":\r
1114                                 Report.Warning (1030, Location, "#warning: '" + arg + "'");\r
1115                                 return true;\r
1116 \r
1117                         case "region":\r
1118                                 arg = "true";\r
1119                                 goto case "if";\r
1120 \r
1121                         case "endregion":\r
1122                                 goto case "endif";\r
1123                                 \r
1124                         case "if":\r
1125                                 if (arg == ""){\r
1126                                         report1517 ();\r
1127                                         return true;\r
1128                                 }\r
1129                                 bool taking = false;\r
1130                                 if (ifstack == null)\r
1131                                         ifstack = new Stack ();\r
1132 \r
1133                                 if (ifstack.Count == 0){\r
1134                                         taking = true;\r
1135                                 } else {\r
1136                                         int state = (int) ifstack.Peek ();\r
1137                                         if ((state & TAKING) != 0)\r
1138                                                 taking = true;\r
1139                                 }\r
1140                                         \r
1141                                 if (eval (arg) && taking){\r
1142                                         ifstack.Push (TAKING | TAKEN_BEFORE | PARENT_TAKING);\r
1143                                         return true;\r
1144                                 } else {\r
1145                                         ifstack.Push (taking ? PARENT_TAKING : 0);\r
1146                                         return false;\r
1147                                 }\r
1148                                 \r
1149                         case "endif":\r
1150                                 if (ifstack == null || ifstack.Count == 0){\r
1151                                         report1028 ("no #if for this #endif");\r
1152                                         return true;\r
1153                                 } else {\r
1154                                         ifstack.Pop ();\r
1155                                         if (ifstack.Count == 0)\r
1156                                                 return true;\r
1157                                         else {\r
1158                                                 int state = (int) ifstack.Peek ();\r
1159 \r
1160                                                 if ((state & TAKING) != 0)\r
1161                                                         return true;\r
1162                                                 else\r
1163                                                         return false;\r
1164                                         }\r
1165                                 }\r
1166 \r
1167                         case "elif":\r
1168                                 if (ifstack == null || ifstack.Count == 0){\r
1169                                         report1028 ("no #if for this #elif");\r
1170                                         return true;\r
1171                                 } else {\r
1172                                         int state = (int) ifstack.Peek ();\r
1173 \r
1174                                         if ((state & ELSE_SEEN) != 0){\r
1175                                                 report1028 ("#elif not valid after #else");\r
1176                                                 return true;\r
1177                                         }\r
1178 \r
1179                                         if ((state & (TAKEN_BEFORE | TAKING)) != 0)\r
1180                                                 return false;\r
1181 \r
1182                                         if (eval (arg) && ((state & PARENT_TAKING) != 0)){\r
1183                                                 state = (int) ifstack.Pop ();\r
1184                                                 ifstack.Push (state | TAKING | TAKEN_BEFORE);\r
1185                                                 return true;\r
1186                                         } else \r
1187                                                 return false;\r
1188                                 }\r
1189 \r
1190                         case "else":\r
1191                                 if (ifstack == null || ifstack.Count == 0){\r
1192                                         Report.Error (\r
1193                                                 1028, Location,\r
1194                                                 "Unexpected processor directive (no #if for this #else)");\r
1195                                         return true;\r
1196                                 } else {\r
1197                                         int state = (int) ifstack.Peek ();\r
1198 \r
1199                                         if ((state & ELSE_SEEN) != 0){\r
1200                                                 report1028 ("#else within #else");\r
1201                                                 return true;\r
1202                                         }\r
1203 \r
1204                                         ifstack.Pop ();\r
1205                                         ifstack.Push (state | ELSE_SEEN);\r
1206 \r
1207                                         if ((state & TAKEN_BEFORE) == 0){\r
1208                                                 if ((state & PARENT_TAKING) != 0)\r
1209                                                         return true;\r
1210                                                 else\r
1211                                                         return false;\r
1212                                         }\r
1213                                         return false;\r
1214                                 }\r
1215                         }\r
1216                         \r
1217                         Report.Error (1024, "Preprocessor directive expected (got: " + cmd + ")");\r
1218                         return true;\r
1219                 }\r
1220                 \r
1221                 public int xtoken ()\r
1222                 {\r
1223                         int t;\r
1224                         bool allow_keyword_as_ident = false;\r
1225                         bool doread = false;\r
1226                         int c;\r
1227 \r
1228                         val = null;\r
1229                         // optimization: eliminate col and implement #directive semantic correctly.\r
1230                         for (;(c = getChar ()) != -1; col++) {\r
1231                                 if (is_identifier_start_character ((char) c)){\r
1232                                         System.Text.StringBuilder id = new System.Text.StringBuilder ();\r
1233                                         string ids;\r
1234 \r
1235                                         tokens_seen = true;\r
1236                                         id.Append ((char) c);\r
1237                                         \r
1238                                         while ((c = peekChar ()) != -1) {\r
1239                                                 if (is_identifier_part_character ((char) c)){\r
1240                                                         id.Append ((char)getChar ());\r
1241                                                         col++;\r
1242                                                 } else \r
1243                                                         break;\r
1244                                         }\r
1245                                         \r
1246                                         ids = id.ToString ();\r
1247 \r
1248                                         if (!is_keyword (ids) || allow_keyword_as_ident) {\r
1249                                                 val = ids;\r
1250                                                 if (ids.Length > 512){\r
1251                                                         Report.Error (\r
1252                                                                 645, Location,\r
1253                                                                 "Identifier too long (limit is 512 chars)");\r
1254                                                 }\r
1255                                                 allow_keyword_as_ident = false;\r
1256                                                 return Token.IDENTIFIER;\r
1257                                         }\r
1258 \r
1259                                         // true, false and null are in the hash anyway.\r
1260                                         return GetKeyword (ids);\r
1261 \r
1262                                 }\r
1263 \r
1264                                 if (c == '.'){\r
1265                                         tokens_seen = true;\r
1266                                         if (Char.IsDigit ((char) peekChar ()))\r
1267                                                 return is_number (c);\r
1268                                         return Token.DOT;\r
1269                                 }\r
1270                                 \r
1271                                 if (Char.IsDigit ((char) c)){\r
1272                                         tokens_seen = true;\r
1273                                         return is_number (c);\r
1274                                 }\r
1275 \r
1276                                 // Handle double-slash comments.\r
1277                                 if (c == '/'){\r
1278                                         int d = peekChar ();\r
1279                                 \r
1280                                         if (d == '/'){\r
1281                                                 getChar ();\r
1282                                                 while ((d = getChar ()) != -1 && (d != '\n'))\r
1283                                                         col++;\r
1284                                                 line++;\r
1285                                                 ref_line++;\r
1286                                                 col = 0;\r
1287                                                 continue;\r
1288                                         } else if (d == '*'){\r
1289                                                 getChar ();\r
1290 \r
1291                                                 while ((d = getChar ()) != -1){\r
1292                                                         if (d == '*' && peekChar () == '/'){\r
1293                                                                 getChar ();\r
1294                                                                 col++;\r
1295                                                                 break;\r
1296                                                         }\r
1297                                                         if (d == '\n'){\r
1298                                                                 line++;\r
1299                                                                 ref_line++;\r
1300                                                                 col = 0;\r
1301                                                         }\r
1302                                                 }\r
1303                                                 continue;\r
1304                                         }\r
1305                                 }\r
1306 \r
1307                                 /* For now, ignore pre-processor commands */\r
1308                                 // FIXME: In C# the '#' is not limited to appear\r
1309                                 // on the first column.\r
1310                                 if (c == '#' && !tokens_seen){\r
1311                                 start_again:\r
1312                                         \r
1313                                         bool cont = handle_preprocessing_directive ();\r
1314 \r
1315                                         if (cont){\r
1316                                                 col = 0;\r
1317                                                 continue;\r
1318                                         }\r
1319                                         col = 1;\r
1320 \r
1321                                         bool skipping = false;\r
1322                                         for (;(c = getChar ()) != -1; col++){\r
1323                                                 if (c == '\n'){\r
1324                                                         col = 0;\r
1325                                                         line++;\r
1326                                                         ref_line++;\r
1327                                                         skipping = false;\r
1328                                                 } else if (c == ' ' || c == '\t' || c == '\v' || c == '\r')\r
1329                                                         continue;\r
1330                                                 else if (c != '#')\r
1331                                                         skipping = true;\r
1332                                                 if (c == '#' && !skipping)\r
1333                                                         goto start_again;\r
1334                                         }\r
1335                                         tokens_seen = false;\r
1336                                         if (c == -1)\r
1337                                                 Report.Error (1027, Location, "#endif expected");\r
1338                                         continue;\r
1339                                 }\r
1340                                 \r
1341                                 if ((t = is_punct ((char)c, ref doread)) != Token.ERROR){\r
1342                                         tokens_seen = true;\r
1343                                         if (doread){\r
1344                                                 getChar ();\r
1345                                                 col++;\r
1346                                         }\r
1347                                         return t;\r
1348                                 }\r
1349                                 \r
1350                                 if (c == '"'){\r
1351                                         System.Text.StringBuilder s = new System.Text.StringBuilder ();\r
1352                                         tokens_seen = true;\r
1353                                         \r
1354                                         while ((c = getChar ()) != -1){\r
1355                                                 if (c == '"'){\r
1356                                                         allow_keyword_as_ident = false;\r
1357                                                         val = s.ToString ();\r
1358                                                         return Token.LITERAL_STRING;\r
1359                                                 }\r
1360 \r
1361                                                 if (!allow_keyword_as_ident){\r
1362                                                         c = escape (c);\r
1363                                                         if (c == -1)\r
1364                                                                 return Token.ERROR;\r
1365                                                 }\r
1366                                                 s.Append ((char) c);\r
1367                                         }\r
1368                                 }\r
1369 \r
1370                                 if (c == '\''){\r
1371                                         c = getChar ();\r
1372                                         tokens_seen = true;\r
1373                                         if (c == '\''){\r
1374                                                 error_details = "Empty character literal";\r
1375                                                 Report.Error (1011, Location, error_details);\r
1376                                                 return Token.ERROR;\r
1377                                         }\r
1378                                         c = escape (c);\r
1379                                         if (c == -1)\r
1380                                                 return Token.ERROR;\r
1381                                         val = new System.Char ();\r
1382                                         val = (char) c;\r
1383                                         c = getChar ();\r
1384 \r
1385                                         if (c != '\''){\r
1386                                                 error_details = "Too many characters in character literal";\r
1387                                                 Report.Error (1012, Location, error_details);\r
1388 \r
1389                                                 // Try to recover, read until newline or next "'"\r
1390                                                 while ((c = getChar ()) != -1){\r
1391                                                         if (c == '\n' || c == '\'')\r
1392                                                                 break;\r
1393                                                         \r
1394                                                 }\r
1395                                                 return Token.ERROR;\r
1396                                         }\r
1397                                         return Token.LITERAL_CHARACTER;\r
1398                                 }\r
1399                                 \r
1400                                 // white space\r
1401                                 if (c == '\n'){\r
1402                                         line++;\r
1403                                         ref_line++;\r
1404                                         col = 0;\r
1405                                         tokens_seen = false;\r
1406                                         continue;\r
1407                                 }\r
1408 \r
1409                                 if (c == ' ' || c == '\t' || c == '\f' || c == '\v' || c == '\r'){\r
1410                                         if (c == '\t')\r
1411                                                 col = (((col + 8) / 8) * 8) - 1;\r
1412                                         continue;\r
1413                                 }\r
1414 \r
1415                                 if (c == '@'){\r
1416                                         tokens_seen = true;\r
1417                                         allow_keyword_as_ident = true;\r
1418                                         continue;\r
1419                                 }\r
1420 \r
1421                                 error_details = ((char)c).ToString ();\r
1422                                 \r
1423                                 return Token.ERROR;\r
1424                         }\r
1425 \r
1426                         if (ifstack != null && ifstack.Count > 1)\r
1427                                 Report.Error (1027, Location, "#endif expected");\r
1428                         return Token.EOF;\r
1429                 }\r
1430         }\r
1431 }\r
1432 \r