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 = NumberFormatInfo.InvariantInfo;\r
 254                         styles = NumberStyles.Float;\r
 255                         \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                 void define (string def)\r
 287                 {\r
 288                         if (RootContext.AllDefines.Contains (def))\r
 289                                 return;\r
 290                         RootContext.AllDefines [def] = true;\r
 291                 }\r
 292                 \r
 293                 public Tokenizer (System.IO.Stream input, string fname, ArrayList defs)\r
 294                 {\r
 295                         this.ref_name = fname;\r
 296                         reader = new System.IO.StreamReader (input);\r
 297                         putback_char = -1;\r
 298 \r
 299                         if (defs != null){\r
 300                                 defines = new Hashtable ();\r
 301                                 foreach (string def in defs)\r
 302                                         define (def);\r
 303                         }\r
 304 \r
 305                         //\r
 306                         // FIXME: This could be `Location.Push' but we have to\r
 307                         // find out why the MS compiler allows this\r
 308                         //\r
 309                         Mono.CSharp.Location.Push (fname);\r
 310                 }\r
 311 \r
 312                 bool is_identifier_start_character (char c)\r
 313                 {\r
 314                         return Char.IsLetter (c) || c == '_' ;\r
 315                 }\r
 316 \r
 317                 bool is_identifier_part_character (char c)\r
 318                 {\r
 319                         return (Char.IsLetter (c) || Char.IsDigit (c) || c == '_');\r
 320                 }\r
 321 \r
 322                 int is_punct (char c, ref bool doread)\r
 323                 {\r
 324                         int d;\r
 325                         int t;\r
 326 \r
 327                         doread = false;\r
 328 \r
 329                         switch (c){\r
 330                         case '{':\r
 331                                 return Token.OPEN_BRACE;\r
 332                         case '}':\r
 333                                 return Token.CLOSE_BRACE;\r
 334                         case '[':\r
 335                                 return Token.OPEN_BRACKET;\r
 336                         case ']':\r
 337                                 return Token.CLOSE_BRACKET;\r
 338                         case '(':\r
 339                                 return Token.OPEN_PARENS;\r
 340                         case ')':\r
 341                                 return Token.CLOSE_PARENS;\r
 342                         case ',':\r
 343                                 return Token.COMMA;\r
 344                         case ':':\r
 345                                 return Token.COLON;\r
 346                         case ';':\r
 347                                 return Token.SEMICOLON;\r
 348                         case '~':\r
 349                                 return Token.TILDE;\r
 350                         case '?':\r
 351                                 return Token.INTERR;\r
 352                         }\r
 353 \r
 354                         d = peekChar ();\r
 355                         if (c == '+'){\r
 356                                 \r
 357                                 if (d == '+')\r
 358                                         t = Token.OP_INC;\r
 359                                 else if (d == '=')\r
 360                                         t = Token.OP_ADD_ASSIGN;\r
 361                                 else\r
 362                                         return Token.PLUS;\r
 363                                 doread = true;\r
 364                                 return t;\r
 365                         }\r
 366                         if (c == '-'){\r
 367                                 if (d == '-')\r
 368                                         t = Token.OP_DEC;\r
 369                                 else if (d == '=')\r
 370                                         t = Token.OP_SUB_ASSIGN;\r
 371                                 else if (d == '>')\r
 372                                         t = Token.OP_PTR;\r
 373                                 else\r
 374                                         return Token.MINUS;\r
 375                                 doread = true;\r
 376                                 return t;\r
 377                         }\r
 378 \r
 379                         if (c == '!'){\r
 380                                 if (d == '='){\r
 381                                         doread = true;\r
 382                                         return Token.OP_NE;\r
 383                                 }\r
 384                                 return Token.BANG;\r
 385                         }\r
 386 \r
 387                         if (c == '='){\r
 388                                 if (d == '='){\r
 389                                         doread = true;\r
 390                                         return Token.OP_EQ;\r
 391                                 }\r
 392                                 return Token.ASSIGN;\r
 393                         }\r
 394 \r
 395                         if (c == '&'){\r
 396                                 if (d == '&'){\r
 397                                         doread = true;\r
 398                                         return Token.OP_AND;\r
 399                                 } else if (d == '='){\r
 400                                         doread = true;\r
 401                                         return Token.OP_AND_ASSIGN;\r
 402                                 }\r
 403                                 return Token.BITWISE_AND;\r
 404                         }\r
 405 \r
 406                         if (c == '|'){\r
 407                                 if (d == '|'){\r
 408                                         doread = true;\r
 409                                         return Token.OP_OR;\r
 410                                 } else if (d == '='){\r
 411                                         doread = true;\r
 412                                         return Token.OP_OR_ASSIGN;\r
 413                                 }\r
 414                                 return Token.BITWISE_OR;\r
 415                         }\r
 416 \r
 417                         if (c == '*'){\r
 418                                 if (d == '='){\r
 419                                         doread = true;\r
 420                                         return Token.OP_MULT_ASSIGN;\r
 421                                 }\r
 422                                 return Token.STAR;\r
 423                         }\r
 424 \r
 425                         if (c == '/'){\r
 426                                 if (d == '='){\r
 427                                         doread = true;\r
 428                                         return Token.OP_DIV_ASSIGN;\r
 429                                 }\r
 430                                 return Token.DIV;\r
 431                         }\r
 432 \r
 433                         if (c == '%'){\r
 434                                 if (d == '='){\r
 435                                         doread = true;\r
 436                                         return Token.OP_MOD_ASSIGN;\r
 437                                 }\r
 438                                 return Token.PERCENT;\r
 439                         }\r
 440 \r
 441                         if (c == '^'){\r
 442                                 if (d == '='){\r
 443                                         doread = true;\r
 444                                         return Token.OP_XOR_ASSIGN;\r
 445                                 }\r
 446                                 return Token.CARRET;\r
 447                         }\r
 448 \r
 449                         if (c == '<'){\r
 450                                 if (d == '<'){\r
 451                                         getChar ();\r
 452                                         d = peekChar ();\r
 453 \r
 454                                         if (d == '='){\r
 455                                                 doread = true;\r
 456                                                 return Token.OP_SHIFT_LEFT_ASSIGN;\r
 457                                         }\r
 458                                         return Token.OP_SHIFT_LEFT;\r
 459                                 } else if (d == '='){\r
 460                                         doread = true;\r
 461                                         return Token.OP_LE;\r
 462                                 }\r
 463                                 return Token.OP_LT;\r
 464                         }\r
 465 \r
 466                         if (c == '>'){\r
 467                                 if (d == '>'){\r
 468                                         getChar ();\r
 469                                         d = peekChar ();\r
 470 \r
 471                                         if (d == '='){\r
 472                                                 doread = true;\r
 473                                                 return Token.OP_SHIFT_RIGHT_ASSIGN;\r
 474                                         }\r
 475                                         return Token.OP_SHIFT_RIGHT;\r
 476                                 } else if (d == '='){\r
 477                                         doread = true;\r
 478                                         return Token.OP_GE;\r
 479                                 }\r
 480                                 return Token.OP_GT;\r
 481                         }\r
 482                         return Token.ERROR;\r
 483                 }\r
 484 \r
 485                 bool decimal_digits (int c)\r
 486                 {\r
 487                         int d;\r
 488                         bool seen_digits = false;\r
 489                         \r
 490                         if (c != -1)\r
 491                                 number_builder.Append ((char) c);\r
 492                         \r
 493                         while ((d = peekChar ()) != -1){\r
 494                                 if (Char.IsDigit ((char)d)){\r
 495                                         number_builder.Append ((char) d);\r
 496                                         getChar ();\r
 497                                         seen_digits = true;\r
 498                                 } else\r
 499                                         break;\r
 500                         }\r
 501                         \r
 502                         return seen_digits;\r
 503                 }\r
 504 \r
 505                 bool is_hex (char e)\r
 506                 {\r
 507                         return Char.IsDigit (e) || (e >= 'A' && e <= 'F') || (e >= 'a' && e <= 'f');\r
 508                 }\r
 509                 \r
 510                 void hex_digits (int c)\r
 511                 {\r
 512                         int d;\r
 513 \r
 514                         if (c != -1)\r
 515                                 number_builder.Append ((char) c);\r
 516                         while ((d = peekChar ()) != -1){\r
 517                                 char e = Char.ToUpper ((char) d);\r
 518                                 \r
 519                                 if (is_hex (e)){\r
 520                                         number_builder.Append ((char) e);\r
 521                                         getChar ();\r
 522                                 } else\r
 523                                         break;\r
 524                         }\r
 525                 }\r
 526                 \r
 527                 int real_type_suffix (int c)\r
 528                 {\r
 529                         int t;\r
 530 \r
 531                         switch (c){\r
 532                         case 'F': case 'f':\r
 533                                 t =  Token.LITERAL_FLOAT;\r
 534                                 break;\r
 535                         case 'D': case 'd':\r
 536                                 t = Token.LITERAL_DOUBLE;\r
 537                                 break;\r
 538                         case 'M': case 'm':\r
 539                                  t= Token.LITERAL_DECIMAL;\r
 540                                 break;\r
 541                         default:\r
 542                                 return Token.NONE;\r
 543                         }\r
 544                         return t;\r
 545                 }\r
 546 \r
 547                 int integer_type_suffix (ulong ul, int c)\r
 548                 {\r
 549                         bool is_unsigned = false;\r
 550                         bool is_long = false;\r
 551 \r
 552                         if (c != -1){\r
 553                                 bool scanning = true;\r
 554                                 do {\r
 555                                         switch (c){\r
 556                                         case 'U': case 'u':\r
 557                                                 if (is_unsigned)\r
 558                                                         scanning = false;\r
 559                                                 is_unsigned = true;\r
 560                                                 getChar ();\r
 561                                                 break;\r
 562 \r
 563                                         case 'l':\r
 564                                                 if (!is_unsigned){\r
 565                                                         //\r
 566                                                         // if we have not seen anything in between\r
 567                                                         // report this error\r
 568                                                         //\r
 569                                                         Report.Warning (\r
 570                                                                 78, Location,\r
 571                                                         "the 'l' suffix is easily confused with digit `1'," +\r
 572                                                         " use 'L' for clarity");\r
 573                                                 }\r
 574                                                 goto case 'L';\r
 575                                                 \r
 576                                         case 'L': \r
 577                                                 if (is_long)\r
 578                                                         scanning = false;\r
 579                                                 is_long = true;\r
 580                                                 getChar ();\r
 581                                                 break;\r
 582                                                 \r
 583                                         default:\r
 584                                                 scanning = false;\r
 585                                                 break;\r
 586                                         }\r
 587                                         c = peekChar ();\r
 588                                 } while (scanning);\r
 589                         }\r
 590 \r
 591                         if (is_long && is_unsigned){\r
 592                                 val = ul;\r
 593                                 return Token.LITERAL_INTEGER;\r
 594                         } else if (is_unsigned){\r
 595                                 // uint if possible, or ulong else.\r
 596 \r
 597                                 if ((ul & 0xffffffff00000000) == 0)\r
 598                                         val = (uint) ul;\r
 599                                 else\r
 600                                         val = ul;\r
 601                         } else if (is_long){\r
 602                                 // long if possible, ulong otherwise\r
 603                                 if ((ul & 0x8000000000000000) != 0)\r
 604                                         val = ul;\r
 605                                 else\r
 606                                         val = (long) ul;\r
 607                         } else {\r
 608                                 // int, uint, long or ulong in that order\r
 609                                 if ((ul & 0xffffffff00000000) == 0){\r
 610                                         uint ui = (uint) ul;\r
 611                                         \r
 612                                         if ((ui & 0x80000000) != 0)\r
 613                                                 val = ui;\r
 614                                         else\r
 615                                                 val = (int) ui;\r
 616                                 } else {\r
 617                                         if ((ul & 0x8000000000000000) != 0)\r
 618                                                 val = ul;\r
 619                                         else\r
 620                                                 val = (long) ul;\r
 621                                 }\r
 622                         }\r
 623                         return Token.LITERAL_INTEGER;\r
 624                 }\r
 625                                 \r
 626                 //\r
 627                 // given `c' as the next char in the input decide whether\r
 628                 // we need to convert to a special type, and then choose\r
 629                 // the best representation for the integer\r
 630                 //\r
 631                 int adjust_int (int c)\r
 632                 {\r
 633                         ulong ul = System.UInt64.Parse (number_builder.ToString ());\r
 634                         return integer_type_suffix (ul, c);\r
 635                 }\r
 636 \r
 637                 int adjust_real (int t)\r
 638                 {\r
 639                         string s = number_builder.ToString ();\r
 640 \r
 641                         switch (t){\r
 642                         case Token.LITERAL_DECIMAL:\r
 643                                 val = new System.Decimal ();\r
 644                                 val = System.Decimal.Parse (\r
 645                                         s, styles, csharp_format_info);\r
 646                                 break;\r
 647                         case Token.LITERAL_FLOAT:\r
 648                                 val = new System.Double ();\r
 649                                 val = (float) System.Double.Parse (\r
 650                                         s, styles, csharp_format_info);\r
 651                                 break;\r
 652 \r
 653                         case Token.LITERAL_DOUBLE:\r
 654                         case Token.NONE:\r
 655                                 val = new System.Double ();\r
 656                                 val = System.Double.Parse (\r
 657                                         s, styles, csharp_format_info);\r
 658                                 t = Token.LITERAL_DOUBLE;\r
 659                                 break;\r
 660                         }\r
 661                         return t;\r
 662                 }\r
 663 \r
 664                 //\r
 665                 // Invoked if we know we have .digits or digits\r
 666                 //\r
 667                 int is_number (int c)\r
 668                 {\r
 669                         bool is_real = false;\r
 670                         int type;\r
 671 \r
 672                         number_builder.Length = 0;\r
 673 \r
 674                         if (Char.IsDigit ((char)c)){\r
 675                                 if (c == '0' && peekChar () == 'x' || peekChar () == 'X'){\r
 676                                         ulong ul;\r
 677                                         getChar ();\r
 678                                         hex_digits (-1);\r
 679 \r
 680                                         string s = number_builder.ToString ();\r
 681 \r
 682                                         ul = System.UInt64.Parse (s, NumberStyles.HexNumber);\r
 683                                         return integer_type_suffix (ul, peekChar ());\r
 684                                 }\r
 685                                 decimal_digits (c);\r
 686                                 c = getChar ();\r
 687                         }\r
 688 \r
 689                         //\r
 690                         // We need to handle the case of\r
 691                         // "1.1" vs "1.string" (LITERAL_FLOAT vs NUMBER DOT IDENTIFIER)\r
 692                         //\r
 693                         if (c == '.'){\r
 694                                 if (decimal_digits ('.')){\r
 695                                         is_real = true;\r
 696                                         c = getChar ();\r
 697                                 } else {\r
 698                                         putback ('.');\r
 699                                         number_builder.Length -= 1;\r
 700                                         return adjust_int (-1);\r
 701                                 }\r
 702                         }\r
 703                         \r
 704                         if (c == 'e' || c == 'E'){\r
 705                                 is_real = true;\r
 706                                 number_builder.Append ("e");\r
 707                                 c = getChar ();\r
 708                                 \r
 709                                 if (c == '+')\r
 710                                         number_builder.Append ((char) c);\r
 711                                 else if (c == '-')\r
 712                                         number_builder.Append ((char) c);\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). Trim(quotes);\r
 949                                 } else {\r
 950                                         ref_line = System.Int32.Parse (arg);\r
 951                                 }\r
 952                         } catch {\r
 953                                 return false;\r
 954                         }\r
 955                         \r
 956                         return true;\r
 957                 }\r
 958 \r
 959                 //\r
 960                 // Handles #define and #undef\r
 961                 //\r
 962                 void PreProcessDefinition (bool is_define, string arg)\r
 963                 {\r
 964                         if (arg == "" || arg == "true" || arg == "false"){\r
 965                                 Report.Error(1001, Location, "Missing identifer to pre-processor directive");\r
 966                                 return;\r
 967                         }\r
 968 \r
 969                         if (is_define){\r
 970                                 if (defines == null)\r
 971                                         defines = new Hashtable ();\r
 972                                 define (arg);\r
 973                         } else {\r
 974                                 if (defines == null)\r
 975                                         return;\r
 976                                 if (defines.Contains (arg))\r
 977                                         defines.Remove (arg);\r
 978                         }\r
 979                 }\r
 980 \r
 981                 bool eval_val (string s)\r
 982                 {\r
 983                         if (s == "true")\r
 984                                 return true;\r
 985                         if (s == "false")\r
 986                                 return false;\r
 987                         \r
 988                         if (defines == null)\r
 989                                 return false;\r
 990                         if (defines.Contains (s))\r
 991                                 return true;\r
 992 \r
 993                         return false;\r
 994                 }\r
 995 \r
 996                 bool pp_primary (ref string s)\r
 997                 {\r
 998                         s = s.Trim ();\r
 999                         int len = s.Length;\r
1000 \r
1001                         if (len > 0){\r
1002                                 char c = s [0];\r
1003                                 \r
1004                                 if (c == '('){\r
1005                                         s = s.Substring (1);\r
1006                                         bool val = pp_expr (ref s);\r
1007                                         if (s.Length > 0 && s [0] == ')'){\r
1008                                                 s = s.Substring (1);\r
1009                                                 return val;\r
1010                                         }\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                                 char c = s [0];\r
1117                                 \r
1118                                 if (c == '|'){\r
1119                                         if (len > 2 && s [1] == '|'){\r
1120                                                 s = s.Substring (2);\r
1121                                                 return va || pp_and (ref s);\r
1122                                         } else {\r
1123                                                 Error_InvalidDirective ();\r
1124                                                 return false;\r
1125                                         }\r
1126                                 } \r
1127                         }\r
1128 \r
1129                         return va;\r
1130                 }\r
1131 \r
1132                 bool eval (string s)\r
1133                 {\r
1134                         bool v = pp_expr (ref s);\r
1135                         s = s.Trim ();\r
1136                         if (s.Length != 0){\r
1137                                 Error_InvalidDirective ();\r
1138                                 return false;\r
1139                         }\r
1140 \r
1141                         return v;\r
1142                 }\r
1143                 \r
1144                 void Error_InvalidDirective ()\r
1145                 {\r
1146                         Report.Error (1517, Location, "Invalid pre-processor directive");\r
1147                 }\r
1148 \r
1149                 void Error_UnexpectedDirective (string extra)\r
1150                 {\r
1151                         Report.Error (\r
1152                                 1028, Location,\r
1153                                 "Unexpected processor directive (" + extra + ")");\r
1154                 }\r
1155 \r
1156                 void Error_TokensSeen ()\r
1157                 {\r
1158                         Report.Error (\r
1159                                 1032, Location,\r
1160                                 "Cannot define or undefine pre-processor symbols after a token in the file");\r
1161                 }\r
1162                 \r
1163                 //\r
1164                 // if true, then the code continues processing the code\r
1165                 // if false, the code stays in a loop until another directive is\r
1166                 // reached.\r
1167                 //\r
1168                 bool handle_preprocessing_directive (bool caller_is_taking)\r
1169                 {\r
1170                         char [] blank = { ' ', '\t' };\r
1171                         string cmd, arg;\r
1172                         \r
1173                         get_cmd_arg (out cmd, out arg);\r
1174 \r
1175                         //\r
1176                         // The first group of pre-processing instructions is always processed\r
1177                         //\r
1178                         switch (cmd){\r
1179                         case "line":\r
1180                                 if (!PreProcessLine (arg))\r
1181                                         Report.Error (\r
1182                                                 1576, Location,\r
1183                                                 "Argument to #line directive is missing or invalid");\r
1184                                 return true;\r
1185 \r
1186                         case "region":\r
1187                                 arg = "true";\r
1188                                 goto case "if";\r
1189 \r
1190                         case "endregion":\r
1191                                 goto case "endif";\r
1192                                 \r
1193                         case "if":\r
1194                                 if (arg == ""){\r
1195                                         Error_InvalidDirective ();\r
1196                                         return true;\r
1197                                 }\r
1198                                 bool taking = false;\r
1199                                 if (ifstack == null)\r
1200                                         ifstack = new Stack ();\r
1201 \r
1202                                 if (ifstack.Count == 0){\r
1203                                         taking = true;\r
1204                                 } else {\r
1205                                         int state = (int) ifstack.Peek ();\r
1206                                         if ((state & TAKING) != 0)\r
1207                                                 taking = true;\r
1208                                 }\r
1209                                         \r
1210                                 if (eval (arg) && taking){\r
1211                                         ifstack.Push (TAKING | TAKEN_BEFORE | PARENT_TAKING);\r
1212                                         return true;\r
1213                                 } else {\r
1214                                         ifstack.Push (taking ? PARENT_TAKING : 0);\r
1215                                         return false;\r
1216                                 }\r
1217                                 \r
1218                         case "endif":\r
1219                                 if (ifstack == null || ifstack.Count == 0){\r
1220                                         Error_UnexpectedDirective ("no #if for this #endif");\r
1221                                         return true;\r
1222                                 } else {\r
1223                                         ifstack.Pop ();\r
1224                                         if (ifstack.Count == 0)\r
1225                                                 return true;\r
1226                                         else {\r
1227                                                 int state = (int) ifstack.Peek ();\r
1228 \r
1229                                                 if ((state & TAKING) != 0)\r
1230                                                         return true;\r
1231                                                 else\r
1232                                                         return false;\r
1233                                         }\r
1234                                 }\r
1235 \r
1236                         case "elif":\r
1237                                 if (ifstack == null || ifstack.Count == 0){\r
1238                                         Error_UnexpectedDirective ("no #if for this #elif");\r
1239                                         return true;\r
1240                                 } else {\r
1241                                         int state = (int) ifstack.Peek ();\r
1242 \r
1243                                         if ((state & ELSE_SEEN) != 0){\r
1244                                                 Error_UnexpectedDirective ("#elif not valid after #else");\r
1245                                                 return true;\r
1246                                         }\r
1247 \r
1248                                         if ((state & (TAKEN_BEFORE | TAKING)) != 0)\r
1249                                                 return false;\r
1250 \r
1251                                         if (eval (arg) && ((state & PARENT_TAKING) != 0)){\r
1252                                                 state = (int) ifstack.Pop ();\r
1253                                                 ifstack.Push (state | TAKING | TAKEN_BEFORE);\r
1254                                                 return true;\r
1255                                         } else \r
1256                                                 return false;\r
1257                                 }\r
1258 \r
1259                         case "else":\r
1260                                 if (ifstack == null || ifstack.Count == 0){\r
1261                                         Report.Error (\r
1262                                                 1028, Location,\r
1263                                                 "Unexpected processor directive (no #if for this #else)");\r
1264                                         return true;\r
1265                                 } else {\r
1266                                         int state = (int) ifstack.Peek ();\r
1267 \r
1268                                         if ((state & ELSE_SEEN) != 0){\r
1269                                                 Error_UnexpectedDirective ("#else within #else");\r
1270                                                 return true;\r
1271                                         }\r
1272 \r
1273                                         ifstack.Pop ();\r
1274                                         ifstack.Push (state | ELSE_SEEN);\r
1275 \r
1276                                         if ((state & TAKEN_BEFORE) == 0){\r
1277                                                 if ((state & PARENT_TAKING) != 0)\r
1278                                                         return true;\r
1279                                                 else\r
1280                                                         return false;\r
1281                                         }\r
1282                                         return false;\r
1283                                 }\r
1284                         }\r
1285 \r
1286                         //\r
1287                         // These are only processed if we are in a `taking' block\r
1288                         //\r
1289                         if (!caller_is_taking)\r
1290                                 return false;\r
1291                                         \r
1292                         switch (cmd){\r
1293                         case "define":\r
1294                                 if (any_token_seen){\r
1295                                         Error_TokensSeen ();\r
1296                                         return true;\r
1297                                 }\r
1298                                 PreProcessDefinition (true, arg);\r
1299                                 return true;\r
1300 \r
1301                         case "undef":\r
1302                                 if (any_token_seen){\r
1303                                         Error_TokensSeen ();\r
1304                                         return true;\r
1305                                 }\r
1306                                 PreProcessDefinition (false, arg);\r
1307                                 return true;\r
1308 \r
1309                         case "error":\r
1310                                 Report.Error (1029, Location, "#error: '" + arg + "'");\r
1311                                 return true;\r
1312 \r
1313                         case "warning":\r
1314                                 Report.Warning (1030, Location, "#warning: '" + arg + "'");\r
1315                                 return true;\r
1316                         }\r
1317 \r
1318                         Report.Error (1024, Location, "Preprocessor directive expected (got: " + cmd + ")");\r
1319                         return true;\r
1320                 }\r
1321                 \r
1322                 public int xtoken ()\r
1323                 {\r
1324                         int t;\r
1325                         bool allow_keyword_as_ident = false;\r
1326                         bool doread = false;\r
1327                         int c;\r
1328 \r
1329                         val = null;\r
1330                         // optimization: eliminate col and implement #directive semantic correctly.\r
1331                         for (;(c = getChar ()) != -1; col++) {\r
1332                                 if (Char.IsLetter ((char)c) || c == '_'){\r
1333                                         string ids;\r
1334 \r
1335                                         id_builder.Length = 0;\r
1336                                         tokens_seen = true;\r
1337                                         id_builder.Append ((char) c);\r
1338                                         \r
1339                                         while ((c = peekChar ()) != -1) {\r
1340                                                 if (is_identifier_part_character ((char) c)){\r
1341                                                         id_builder.Append ((char)getChar ());\r
1342                                                         col++;\r
1343                                                 } else \r
1344                                                         break;\r
1345                                         }\r
1346                                         \r
1347                                         ids = id_builder.ToString ();\r
1348 \r
1349                                         if (!is_keyword (ids) || allow_keyword_as_ident) {\r
1350                                                 val = ids;\r
1351                                                 if (ids.Length > 512){\r
1352                                                         Report.Error (\r
1353                                                                 645, Location,\r
1354                                                                 "Identifier too long (limit is 512 chars)");\r
1355                                                 }\r
1356                                                 allow_keyword_as_ident = false;\r
1357                                                 return Token.IDENTIFIER;\r
1358                                         }\r
1359 \r
1360                                         // true, false and null are in the hash anyway.\r
1361                                         return GetKeyword (ids);\r
1362 \r
1363                                 }\r
1364 \r
1365                                 if (c == '.'){\r
1366                                         tokens_seen = true;\r
1367                                         if (Char.IsDigit ((char) peekChar ()))\r
1368                                                 return is_number (c);\r
1369                                         return Token.DOT;\r
1370                                 }\r
1371                                 \r
1372                                 if (Char.IsDigit ((char) c)){\r
1373                                         tokens_seen = true;\r
1374                                         return is_number (c);\r
1375                                 }\r
1376 \r
1377                                 // Handle double-slash comments.\r
1378                                 if (c == '/'){\r
1379                                         int d = peekChar ();\r
1380                                 \r
1381                                         if (d == '/'){\r
1382                                                 getChar ();\r
1383                                                 while ((d = getChar ()) != -1 && (d != '\n'))\r
1384                                                         col++;\r
1385                                                 line++;\r
1386                                                 ref_line++;\r
1387                                                 col = 0;\r
1388                                                 any_token_seen |= tokens_seen;\r
1389                                                 tokens_seen = false;\r
1390                                                 continue;\r
1391                                         } else if (d == '*'){\r
1392                                                 getChar ();\r
1393 \r
1394                                                 while ((d = getChar ()) != -1){\r
1395                                                         if (d == '*' && peekChar () == '/'){\r
1396                                                                 getChar ();\r
1397                                                                 col++;\r
1398                                                                 break;\r
1399                                                         }\r
1400                                                         if (d == '\n'){\r
1401                                                                 line++;\r
1402                                                                 ref_line++;\r
1403                                                                 col = 0;\r
1404                                                                 any_token_seen |= tokens_seen;\r
1405                                                                 tokens_seen = false;\r
1406                                                         }\r
1407                                                 }\r
1408                                                 continue;\r
1409                                         }\r
1410                                 }\r
1411 \r
1412                                 /* For now, ignore pre-processor commands */\r
1413                                 // FIXME: In C# the '#' is not limited to appear\r
1414                                 // on the first column.\r
1415                                 if (c == '#' && !tokens_seen){\r
1416                                         bool cont = true;\r
1417                                         \r
1418                                 start_again:\r
1419                                         \r
1420                                         cont = handle_preprocessing_directive (cont);\r
1421 \r
1422                                         if (cont){\r
1423                                                 col = 0;\r
1424                                                 continue;\r
1425                                         }\r
1426                                         col = 1;\r
1427 \r
1428                                         bool skipping = false;\r
1429                                         for (;(c = getChar ()) != -1; col++){\r
1430                                                 if (c == '\n'){\r
1431                                                         col = 0;\r
1432                                                         line++;\r
1433                                                         ref_line++;\r
1434                                                         skipping = false;\r
1435                                                 } else if (c == ' ' || c == '\t' || c == '\v' || c == '\r')\r
1436                                                         continue;\r
1437                                                 else if (c != '#')\r
1438                                                         skipping = true;\r
1439                                                 if (c == '#' && !skipping)\r
1440                                                         goto start_again;\r
1441                                         }\r
1442                                         any_token_seen |= tokens_seen;\r
1443                                         tokens_seen = false;\r
1444                                         if (c == -1)\r
1445                                                 Report.Error (1027, Location, "#endif expected");\r
1446                                         continue;\r
1447                                 }\r
1448                                 \r
1449                                 if ((t = is_punct ((char)c, ref doread)) != Token.ERROR){\r
1450                                         tokens_seen = true;\r
1451                                         if (doread){\r
1452                                                 getChar ();\r
1453                                                 col++;\r
1454                                         }\r
1455                                         return t;\r
1456                                 }\r
1457                                 \r
1458                                 if (c == '"'){\r
1459                                         string_builder.Length = 0;\r
1460                                         \r
1461                                         tokens_seen = true;\r
1462                                         \r
1463                                         while ((c = getChar ()) != -1){\r
1464                                                 if (c == '"'){\r
1465                                                         if (allow_keyword_as_ident && peekChar () == '"'){\r
1466                                                                 string_builder.Append ((char) c);\r
1467                                                                 getChar ();\r
1468                                                                 continue;\r
1469                                                         } \r
1470                                                         allow_keyword_as_ident = false;\r
1471                                                         val = string_builder.ToString ();\r
1472                                                         return Token.LITERAL_STRING;\r
1473                                                 }\r
1474 \r
1475                                                 if (!allow_keyword_as_ident){\r
1476                                                         c = escape (c);\r
1477                                                         if (c == -1)\r
1478                                                                 return Token.ERROR;\r
1479                                                 }\r
1480                                                 string_builder.Append ((char) c);\r
1481                                         }\r
1482                                 }\r
1483 \r
1484                                 if (c == '\''){\r
1485                                         c = getChar ();\r
1486                                         tokens_seen = true;\r
1487                                         if (c == '\''){\r
1488                                                 error_details = "Empty character literal";\r
1489                                                 Report.Error (1011, Location, error_details);\r
1490                                                 return Token.ERROR;\r
1491                                         }\r
1492                                         c = escape (c);\r
1493                                         if (c == -1)\r
1494                                                 return Token.ERROR;\r
1495                                         val = new System.Char ();\r
1496                                         val = (char) c;\r
1497                                         c = getChar ();\r
1498 \r
1499                                         if (c != '\''){\r
1500                                                 error_details = "Too many characters in character literal";\r
1501                                                 Report.Error (1012, Location, error_details);\r
1502 \r
1503                                                 // Try to recover, read until newline or next "'"\r
1504                                                 while ((c = getChar ()) != -1){\r
1505                                                         if (c == '\n' || c == '\'')\r
1506                                                                 break;\r
1507                                                         \r
1508                                                 }\r
1509                                                 return Token.ERROR;\r
1510                                         }\r
1511                                         return Token.LITERAL_CHARACTER;\r
1512                                 }\r
1513                                 \r
1514                                 // white space\r
1515                                 if (c == '\n'){\r
1516                                         line++;\r
1517                                         ref_line++;\r
1518                                         col = 0;\r
1519                                         any_token_seen |= tokens_seen;\r
1520                                         tokens_seen = false;\r
1521                                         continue;\r
1522                                 }\r
1523 \r
1524                                 if (c == ' ' || c == '\t' || c == '\f' || c == '\v' || c == '\r'){\r
1525                                         if (c == '\t')\r
1526                                                 col = (((col + 8) / 8) * 8) - 1;\r
1527                                         continue;\r
1528                                 }\r
1529 \r
1530                                 if (c == '@'){\r
1531                                         tokens_seen = true;\r
1532                                         allow_keyword_as_ident = true;\r
1533                                         continue;\r
1534                                 }\r
1535 \r
1536                                 error_details = ((char)c).ToString ();\r
1537                                 \r
1538                                 return Token.ERROR;\r
1539                         }\r
1540 \r
1541                         if (ifstack != null && ifstack.Count > 1)\r
1542                                 Report.Error (1027, Location, "#endif expected");\r
1543                         return Token.EOF;\r
1544                 }\r
1545         }\r
1546 }\r
1547 \r