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