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 (def == "TRACE")\r
 289                                 RootContext.DisableTrace = false;\r
 290                         else if (def == "DEBUG")\r
 291                                 RootContext.DisableDebug = false;\r
 292                         defines [def] = true;\r
 293                 }\r
 294                 \r
 295                 public Tokenizer (System.IO.Stream input, string fname, ArrayList defs)\r
 296                 {\r
 297                         this.ref_name = fname;\r
 298                         reader = new System.IO.StreamReader (input);\r
 299                         putback_char = -1;\r
 300 \r
 301                         if (defs != null){\r
 302                                 defines = new Hashtable ();\r
 303                                 foreach (string def in defs)\r
 304                                         define (def);\r
 305                         }\r
 306 \r
 307                         //\r
 308                         // FIXME: This could be `Location.Push' but we have to\r
 309                         // find out why the MS compiler allows this\r
 310                         //\r
 311                         Mono.CSharp.Location.Push (fname);\r
 312                 }\r
 313 \r
 314                 bool is_identifier_start_character (char c)\r
 315                 {\r
 316                         return Char.IsLetter (c) || c == '_' ;\r
 317                 }\r
 318 \r
 319                 bool is_identifier_part_character (char c)\r
 320                 {\r
 321                         return (Char.IsLetter (c) || Char.IsDigit (c) || c == '_');\r
 322                 }\r
 323 \r
 324                 int is_punct (char c, ref bool doread)\r
 325                 {\r
 326                         int d;\r
 327                         int t;\r
 328 \r
 329                         doread = false;\r
 330 \r
 331                         switch (c){\r
 332                         case '{':\r
 333                                 return Token.OPEN_BRACE;\r
 334                         case '}':\r
 335                                 return Token.CLOSE_BRACE;\r
 336                         case '[':\r
 337                                 return Token.OPEN_BRACKET;\r
 338                         case ']':\r
 339                                 return Token.CLOSE_BRACKET;\r
 340                         case '(':\r
 341                                 return Token.OPEN_PARENS;\r
 342                         case ')':\r
 343                                 return Token.CLOSE_PARENS;\r
 344                         case ',':\r
 345                                 return Token.COMMA;\r
 346                         case ':':\r
 347                                 return Token.COLON;\r
 348                         case ';':\r
 349                                 return Token.SEMICOLON;\r
 350                         case '~':\r
 351                                 return Token.TILDE;\r
 352                         case '?':\r
 353                                 return Token.INTERR;\r
 354                         }\r
 355 \r
 356                         d = peekChar ();\r
 357                         if (c == '+'){\r
 358                                 \r
 359                                 if (d == '+')\r
 360                                         t = Token.OP_INC;\r
 361                                 else if (d == '=')\r
 362                                         t = Token.OP_ADD_ASSIGN;\r
 363                                 else\r
 364                                         return Token.PLUS;\r
 365                                 doread = true;\r
 366                                 return t;\r
 367                         }\r
 368                         if (c == '-'){\r
 369                                 if (d == '-')\r
 370                                         t = Token.OP_DEC;\r
 371                                 else if (d == '=')\r
 372                                         t = Token.OP_SUB_ASSIGN;\r
 373                                 else if (d == '>')\r
 374                                         t = Token.OP_PTR;\r
 375                                 else\r
 376                                         return Token.MINUS;\r
 377                                 doread = true;\r
 378                                 return t;\r
 379                         }\r
 380 \r
 381                         if (c == '!'){\r
 382                                 if (d == '='){\r
 383                                         doread = true;\r
 384                                         return Token.OP_NE;\r
 385                                 }\r
 386                                 return Token.BANG;\r
 387                         }\r
 388 \r
 389                         if (c == '='){\r
 390                                 if (d == '='){\r
 391                                         doread = true;\r
 392                                         return Token.OP_EQ;\r
 393                                 }\r
 394                                 return Token.ASSIGN;\r
 395                         }\r
 396 \r
 397                         if (c == '&'){\r
 398                                 if (d == '&'){\r
 399                                         doread = true;\r
 400                                         return Token.OP_AND;\r
 401                                 } else if (d == '='){\r
 402                                         doread = true;\r
 403                                         return Token.OP_AND_ASSIGN;\r
 404                                 }\r
 405                                 return Token.BITWISE_AND;\r
 406                         }\r
 407 \r
 408                         if (c == '|'){\r
 409                                 if (d == '|'){\r
 410                                         doread = true;\r
 411                                         return Token.OP_OR;\r
 412                                 } else if (d == '='){\r
 413                                         doread = true;\r
 414                                         return Token.OP_OR_ASSIGN;\r
 415                                 }\r
 416                                 return Token.BITWISE_OR;\r
 417                         }\r
 418 \r
 419                         if (c == '*'){\r
 420                                 if (d == '='){\r
 421                                         doread = true;\r
 422                                         return Token.OP_MULT_ASSIGN;\r
 423                                 }\r
 424                                 return Token.STAR;\r
 425                         }\r
 426 \r
 427                         if (c == '/'){\r
 428                                 if (d == '='){\r
 429                                         doread = true;\r
 430                                         return Token.OP_DIV_ASSIGN;\r
 431                                 }\r
 432                                 return Token.DIV;\r
 433                         }\r
 434 \r
 435                         if (c == '%'){\r
 436                                 if (d == '='){\r
 437                                         doread = true;\r
 438                                         return Token.OP_MOD_ASSIGN;\r
 439                                 }\r
 440                                 return Token.PERCENT;\r
 441                         }\r
 442 \r
 443                         if (c == '^'){\r
 444                                 if (d == '='){\r
 445                                         doread = true;\r
 446                                         return Token.OP_XOR_ASSIGN;\r
 447                                 }\r
 448                                 return Token.CARRET;\r
 449                         }\r
 450 \r
 451                         if (c == '<'){\r
 452                                 if (d == '<'){\r
 453                                         getChar ();\r
 454                                         d = peekChar ();\r
 455 \r
 456                                         if (d == '='){\r
 457                                                 doread = true;\r
 458                                                 return Token.OP_SHIFT_LEFT_ASSIGN;\r
 459                                         }\r
 460                                         return Token.OP_SHIFT_LEFT;\r
 461                                 } else if (d == '='){\r
 462                                         doread = true;\r
 463                                         return Token.OP_LE;\r
 464                                 }\r
 465                                 return Token.OP_LT;\r
 466                         }\r
 467 \r
 468                         if (c == '>'){\r
 469                                 if (d == '>'){\r
 470                                         getChar ();\r
 471                                         d = peekChar ();\r
 472 \r
 473                                         if (d == '='){\r
 474                                                 doread = true;\r
 475                                                 return Token.OP_SHIFT_RIGHT_ASSIGN;\r
 476                                         }\r
 477                                         return Token.OP_SHIFT_RIGHT;\r
 478                                 } else if (d == '='){\r
 479                                         doread = true;\r
 480                                         return Token.OP_GE;\r
 481                                 }\r
 482                                 return Token.OP_GT;\r
 483                         }\r
 484                         return Token.ERROR;\r
 485                 }\r
 486 \r
 487                 bool decimal_digits (int c)\r
 488                 {\r
 489                         int d;\r
 490                         bool seen_digits = false;\r
 491                         \r
 492                         if (c != -1)\r
 493                                 number_builder.Append ((char) c);\r
 494                         \r
 495                         while ((d = peekChar ()) != -1){\r
 496                                 if (Char.IsDigit ((char)d)){\r
 497                                         number_builder.Append ((char) d);\r
 498                                         getChar ();\r
 499                                         seen_digits = true;\r
 500                                 } else\r
 501                                         break;\r
 502                         }\r
 503                         \r
 504                         return seen_digits;\r
 505                 }\r
 506 \r
 507                 bool is_hex (char e)\r
 508                 {\r
 509                         return Char.IsDigit (e) || (e >= 'A' && e <= 'F') || (e >= 'a' && e <= 'f');\r
 510                 }\r
 511                 \r
 512                 void hex_digits (int c)\r
 513                 {\r
 514                         int d;\r
 515 \r
 516                         if (c != -1)\r
 517                                 number_builder.Append ((char) c);\r
 518                         while ((d = peekChar ()) != -1){\r
 519                                 char e = Char.ToUpper ((char) d);\r
 520                                 \r
 521                                 if (is_hex (e)){\r
 522                                         number_builder.Append ((char) e);\r
 523                                         getChar ();\r
 524                                 } else\r
 525                                         break;\r
 526                         }\r
 527                 }\r
 528                 \r
 529                 int real_type_suffix (int c)\r
 530                 {\r
 531                         int t;\r
 532 \r
 533                         switch (c){\r
 534                         case 'F': case 'f':\r
 535                                 t =  Token.LITERAL_FLOAT;\r
 536                                 break;\r
 537                         case 'D': case 'd':\r
 538                                 t = Token.LITERAL_DOUBLE;\r
 539                                 break;\r
 540                         case 'M': case 'm':\r
 541                                  t= Token.LITERAL_DECIMAL;\r
 542                                 break;\r
 543                         default:\r
 544                                 return Token.NONE;\r
 545                         }\r
 546                         return t;\r
 547                 }\r
 548 \r
 549                 int integer_type_suffix (ulong ul, int c)\r
 550                 {\r
 551                         bool is_unsigned = false;\r
 552                         bool is_long = false;\r
 553 \r
 554                         if (c != -1){\r
 555                                 bool scanning = true;\r
 556                                 do {\r
 557                                         switch (c){\r
 558                                         case 'U': case 'u':\r
 559                                                 if (is_unsigned)\r
 560                                                         scanning = false;\r
 561                                                 is_unsigned = true;\r
 562                                                 getChar ();\r
 563                                                 break;\r
 564 \r
 565                                         case 'l':\r
 566                                                 if (!is_unsigned){\r
 567                                                         //\r
 568                                                         // if we have not seen anything in between\r
 569                                                         // report this error\r
 570                                                         //\r
 571                                                         Report.Warning (\r
 572                                                                 78, Location,\r
 573                                                         "the 'l' suffix is easily confused with digit `1'," +\r
 574                                                         " use 'L' for clarity");\r
 575                                                 }\r
 576                                                 goto case 'L';\r
 577                                                 \r
 578                                         case 'L': \r
 579                                                 if (is_long)\r
 580                                                         scanning = false;\r
 581                                                 is_long = true;\r
 582                                                 getChar ();\r
 583                                                 break;\r
 584                                                 \r
 585                                         default:\r
 586                                                 scanning = false;\r
 587                                                 break;\r
 588                                         }\r
 589                                         c = peekChar ();\r
 590                                 } while (scanning);\r
 591                         }\r
 592 \r
 593                         if (is_long && is_unsigned){\r
 594                                 val = ul;\r
 595                                 return Token.LITERAL_INTEGER;\r
 596                         } else if (is_unsigned){\r
 597                                 // uint if possible, or ulong else.\r
 598 \r
 599                                 if ((ul & 0xffffffff00000000) == 0)\r
 600                                         val = (uint) ul;\r
 601                                 else\r
 602                                         val = ul;\r
 603                         } else if (is_long){\r
 604                                 // long if possible, ulong otherwise\r
 605                                 if ((ul & 0x8000000000000000) != 0)\r
 606                                         val = ul;\r
 607                                 else\r
 608                                         val = (long) ul;\r
 609                         } else {\r
 610                                 // int, uint, long or ulong in that order\r
 611                                 if ((ul & 0xffffffff00000000) == 0){\r
 612                                         uint ui = (uint) ul;\r
 613                                         \r
 614                                         if ((ui & 0x80000000) != 0)\r
 615                                                 val = ui;\r
 616                                         else\r
 617                                                 val = (int) ui;\r
 618                                 } else {\r
 619                                         if ((ul & 0x8000000000000000) != 0)\r
 620                                                 val = ul;\r
 621                                         else\r
 622                                                 val = (long) ul;\r
 623                                 }\r
 624                         }\r
 625                         return Token.LITERAL_INTEGER;\r
 626                 }\r
 627                                 \r
 628                 //\r
 629                 // given `c' as the next char in the input decide whether\r
 630                 // we need to convert to a special type, and then choose\r
 631                 // the best representation for the integer\r
 632                 //\r
 633                 int adjust_int (int c)\r
 634                 {\r
 635                         ulong ul = System.UInt64.Parse (number_builder.ToString ());\r
 636                         return integer_type_suffix (ul, c);\r
 637                 }\r
 638 \r
 639                 int adjust_real (int t)\r
 640                 {\r
 641                         string s = number_builder.ToString ();\r
 642 \r
 643                         switch (t){\r
 644                         case Token.LITERAL_DECIMAL:\r
 645                                 val = new System.Decimal ();\r
 646                                 val = System.Decimal.Parse (\r
 647                                         s, styles, csharp_format_info);\r
 648                                 break;\r
 649                         case Token.LITERAL_FLOAT:\r
 650                                 val = new System.Double ();\r
 651                                 val = (float) System.Double.Parse (\r
 652                                         s, styles, csharp_format_info);\r
 653                                 break;\r
 654 \r
 655                         case Token.LITERAL_DOUBLE:\r
 656                         case Token.NONE:\r
 657                                 val = new System.Double ();\r
 658                                 val = System.Double.Parse (\r
 659                                         s, styles, csharp_format_info);\r
 660                                 t = Token.LITERAL_DOUBLE;\r
 661                                 break;\r
 662                         }\r
 663                         return t;\r
 664                 }\r
 665 \r
 666                 //\r
 667                 // Invoked if we know we have .digits or digits\r
 668                 //\r
 669                 int is_number (int c)\r
 670                 {\r
 671                         bool is_real = false;\r
 672                         int type;\r
 673 \r
 674                         number_builder.Length = 0;\r
 675 \r
 676                         if (Char.IsDigit ((char)c)){\r
 677                                 if (c == '0' && peekChar () == 'x' || peekChar () == 'X'){\r
 678                                         ulong ul;\r
 679                                         getChar ();\r
 680                                         hex_digits (-1);\r
 681 \r
 682                                         string s = number_builder.ToString ();\r
 683 \r
 684                                         ul = System.UInt64.Parse (s, NumberStyles.HexNumber);\r
 685                                         return integer_type_suffix (ul, peekChar ());\r
 686                                 }\r
 687                                 decimal_digits (c);\r
 688                                 c = getChar ();\r
 689                         }\r
 690 \r
 691                         //\r
 692                         // We need to handle the case of\r
 693                         // "1.1" vs "1.string" (LITERAL_FLOAT vs NUMBER DOT IDENTIFIER)\r
 694                         //\r
 695                         if (c == '.'){\r
 696                                 if (decimal_digits ('.')){\r
 697                                         is_real = true;\r
 698                                         c = getChar ();\r
 699                                 } else {\r
 700                                         putback ('.');\r
 701                                         number_builder.Length -= 1;\r
 702                                         return adjust_int (-1);\r
 703                                 }\r
 704                         }\r
 705                         \r
 706                         if (c == 'e' || c == 'E'){\r
 707                                 is_real = true;\r
 708                                 number_builder.Append ("e");\r
 709                                 c = getChar ();\r
 710                                 \r
 711                                 if (c == '+')\r
 712                                         number_builder.Append ((char) c);\r
 713                                 else if (c == '-')\r
 714                                         number_builder.Append ((char) c);\r
 715                                 decimal_digits (-1);\r
 716                                 c = getChar ();\r
 717                         }\r
 718 \r
 719                         type = real_type_suffix (c);\r
 720                         if (type == Token.NONE && !is_real){\r
 721                                 putback (c);\r
 722                                 return adjust_int (c);\r
 723                         } else \r
 724                                 is_real = true;\r
 725 \r
 726                         if (type == Token.NONE){\r
 727                                 putback (c);\r
 728                         }\r
 729                         \r
 730                         if (is_real)\r
 731                                 return adjust_real (type);\r
 732 \r
 733                         Console.WriteLine ("This should not be reached");\r
 734                         throw new Exception ("Is Number should never reach this point");\r
 735                 }\r
 736 \r
 737                 //\r
 738                 // Accepts exactly count (4 or 8) hex, no more no less\r
 739                 //\r
 740                 int getHex (int count, out bool error)\r
 741                 {\r
 742                         int [] buffer = new int [8];\r
 743                         int i;\r
 744                         int total = 0;\r
 745                         int c;\r
 746                         char e;\r
 747                         int top = count != -1 ? count : 4;\r
 748                         \r
 749                         getChar ();\r
 750                         error = false;\r
 751                         for (i = 0; i < top; i++){\r
 752                                 c = getChar ();\r
 753                                 e = Char.ToUpper ((char) c);\r
 754                                 \r
 755                                 if (!is_hex (e)){\r
 756                                         error = true;\r
 757                                         return 0;\r
 758                                 }\r
 759                                 if (Char.IsDigit (e))\r
 760                                         c = (int) e - (int) '0';\r
 761                                 else\r
 762                                         c = (int) e - (int) 'A';\r
 763                                 total = (total * 16) + c;\r
 764                                 if (count == -1){\r
 765                                         int p = peekChar ();\r
 766                                         if (p == -1)\r
 767                                                 break;\r
 768                                         if (!is_hex ((char)p))\r
 769                                                 break;\r
 770                                 }\r
 771                         }\r
 772                         return total;\r
 773                 }\r
 774 \r
 775                 int escape (int c)\r
 776                 {\r
 777                         bool error;\r
 778                         int d;\r
 779                         int v;\r
 780 \r
 781                         d = peekChar ();\r
 782                         if (c != '\\')\r
 783                                 return c;\r
 784                         \r
 785                         switch (d){\r
 786                         case 'a':\r
 787                                 v = '\a'; break;\r
 788                         case 'b':\r
 789                                 v = '\b'; break;\r
 790                         case 'n':\r
 791                                 v = '\n'; break;\r
 792                         case 't':\r
 793                                 v = '\t'; break;\r
 794                         case 'v':\r
 795                                 v = '\v'; break;\r
 796                         case 'r':\r
 797                                 v = '\r'; break;\r
 798                         case '\\':\r
 799                                 v = '\\'; break;\r
 800                         case 'f':\r
 801                                 v = '\f'; break;\r
 802                         case '0':\r
 803                                 v = 0; break;\r
 804                         case '"':\r
 805                                 v = '"'; break;\r
 806                         case '\'':\r
 807                                 v = '\''; break;\r
 808                         case 'x':\r
 809                                 v = getHex (-1, out error);\r
 810                                 if (error)\r
 811                                         goto default;\r
 812                                 return v;\r
 813                         case 'u':\r
 814                                 v = getHex (4, out error);\r
 815                                 if (error)\r
 816                                         goto default;\r
 817                                 return v;\r
 818                         case 'U':\r
 819                                 v = getHex (8, out error);\r
 820                                 if (error)\r
 821                                         goto default;\r
 822                                 return v;\r
 823                         default:\r
 824                                 Report.Error (1009, Location, "Unrecognized escape sequence in " + (char)d);\r
 825                                 return -1;\r
 826                         }\r
 827                         getChar ();\r
 828                         return v;\r
 829                 }\r
 830 \r
 831                 int getChar ()\r
 832                 {\r
 833                         if (putback_char != -1){\r
 834                                 int x = putback_char;\r
 835                                 putback_char = -1;\r
 836 \r
 837                                 return x;\r
 838                         }\r
 839                         return reader.Read ();\r
 840                 }\r
 841 \r
 842                 int peekChar ()\r
 843                 {\r
 844                         if (putback_char != -1)\r
 845                                 return putback_char;\r
 846                         return reader.Peek ();\r
 847                 }\r
 848 \r
 849                 void putback (int c)\r
 850                 {\r
 851                         if (putback_char != -1)\r
 852                                 throw new Exception ("This should not happen putback on putback");\r
 853                         putback_char = c;\r
 854                 }\r
 855 \r
 856                 public bool advance ()\r
 857                 {\r
 858                         return peekChar () != -1;\r
 859                 }\r
 860 \r
 861                 public Object Value {\r
 862                         get {\r
 863                                 return val;\r
 864                         }\r
 865                 }\r
 866 \r
 867                 public Object value ()\r
 868                 {\r
 869                         return val;\r
 870                 }\r
 871                 \r
 872                 public int token ()\r
 873                 {\r
 874                         current_token = xtoken ();\r
 875                         return current_token;\r
 876                 }\r
 877 \r
 878                 static StringBuilder static_cmd_arg = new System.Text.StringBuilder ();\r
 879                 \r
 880                 void get_cmd_arg (out string cmd, out string arg)\r
 881                 {\r
 882                         int c;\r
 883                         \r
 884                         tokens_seen = false;\r
 885                         arg = "";\r
 886                         static_cmd_arg.Length = 0;\r
 887                                 \r
 888                         while ((c = getChar ()) != -1 && (c != '\n') && (c != ' ') && (c != '\t')){\r
 889                                 if (c == '\r')\r
 890                                         continue;\r
 891                                 static_cmd_arg.Append ((char) c);\r
 892                         }\r
 893 \r
 894                         cmd = static_cmd_arg.ToString ();\r
 895 \r
 896                         if (c == '\n'){\r
 897                                 line++;\r
 898                                 ref_line++;\r
 899                                 return;\r
 900                         }\r
 901 \r
 902                         // skip over white space\r
 903                         while ((c = getChar ()) != -1 && (c != '\n') && ((c == ' ') || (c == '\t')))\r
 904                                 ;\r
 905 \r
 906                         if (c == '\n'){\r
 907                                 line++;\r
 908                                 ref_line++;\r
 909                                 return;\r
 910                         }\r
 911                         \r
 912                         static_cmd_arg.Length = 0;\r
 913                         static_cmd_arg.Append ((char) c);\r
 914                         \r
 915                         while ((c = getChar ()) != -1 && (c != '\n')){\r
 916                                 if (c == '\r')\r
 917                                         continue;\r
 918                                 static_cmd_arg.Append ((char) c);\r
 919                         }\r
 920 \r
 921                         if (c == '\n'){\r
 922                                 line++;\r
 923                                 ref_line++;\r
 924                         }\r
 925                         arg = static_cmd_arg.ToString ().Trim ();\r
 926                 }\r
 927 \r
 928                 //\r
 929                 // Handles the #line directive\r
 930                 //\r
 931                 bool PreProcessLine (string arg)\r
 932                 {\r
 933                         if (arg == "")\r
 934                                 return false;\r
 935 \r
 936                         if (arg == "default"){\r
 937                                 line = ref_line = line;\r
 938                                 return false;\r
 939                         }\r
 940                         \r
 941                         try {\r
 942                                 int pos;\r
 943 \r
 944                                 if ((pos = arg.IndexOf (' ')) != -1 && pos != 0){\r
 945                                         ref_line = System.Int32.Parse (arg.Substring (0, pos));\r
 946                                         pos++;\r
 947                                         \r
 948                                         char [] quotes = { '\"' };\r
 949                                         \r
 950                                         ref_name = arg.Substring (pos). Trim(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                                 define (arg);\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 = 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                                                 s = s.Substring (1);\r
1011                                                 return val;\r
1012                                         }\r
1013                                         Error_InvalidDirective ();\r
1014                                         return false;\r
1015                                 }\r
1016                                 \r
1017                                 if (Char.IsLetter (c) || c == '_'){\r
1018                                         int j = 1;\r
1019 \r
1020                                         while (j < len){\r
1021                                                 c = s [j];\r
1022                                                 \r
1023                                                 if (Char.IsLetter (c) || Char.IsDigit (c) || c == '_'){\r
1024                                                         j++;\r
1025                                                         continue;\r
1026                                                 }\r
1027                                                 bool v = eval_val (s.Substring (0, j));\r
1028                                                 s = s.Substring (j);\r
1029                                                 return v;\r
1030                                         }\r
1031                                         bool vv = eval_val (s);\r
1032                                         s = "";\r
1033                                         return vv;\r
1034                                 }\r
1035                         }\r
1036                         Error_InvalidDirective ();\r
1037                         return false;\r
1038                 }\r
1039                 \r
1040                 bool pp_unary (ref string s)\r
1041                 {\r
1042                         s = s.Trim ();\r
1043                         int len = s.Length;\r
1044 \r
1045                         if (len > 0){\r
1046                                 if (s [0] == '!'){\r
1047                                         if (len > 1 && s [1] == '='){\r
1048                                                 Error_InvalidDirective ();\r
1049                                                 return false;\r
1050                                         }\r
1051                                         s = s.Substring (1);\r
1052                                         return ! pp_primary (ref s);\r
1053                                 } else\r
1054                                         return pp_primary (ref s);\r
1055                         } else {\r
1056                                 Error_InvalidDirective ();\r
1057                                 return false;\r
1058                         }\r
1059                 }\r
1060                 \r
1061                 bool pp_eq (ref string s)\r
1062                 {\r
1063                         bool va = pp_unary (ref s);\r
1064 \r
1065                         s = s.Trim ();\r
1066                         int len = s.Length;\r
1067                         if (len > 0){\r
1068                                 if (s [0] == '='){\r
1069                                         if (len > 2 && s [1] == '='){\r
1070                                                 s = s.Substring (2);\r
1071                                                 return va == pp_unary (ref s);\r
1072                                         } else {\r
1073                                                 Error_InvalidDirective ();\r
1074                                                 return false;\r
1075                                         }\r
1076                                 } else if (s [0] == '!' && len > 1 && s [1] == '='){\r
1077                                         s = s.Substring (2);\r
1078 \r
1079                                         return va != pp_unary (ref s);\r
1080 \r
1081                                 }\r
1082                         }\r
1083 \r
1084                         return va;\r
1085                                 \r
1086                 }\r
1087                 \r
1088                 bool pp_and (ref string s)\r
1089                 {\r
1090                         bool va = pp_eq (ref s);\r
1091 \r
1092                         s = s.Trim ();\r
1093                         int len = s.Length;\r
1094                         if (len > 0){\r
1095                                 if (s [0] == '&'){\r
1096                                         if (len > 2 && s [1] == '&'){\r
1097                                                 s = s.Substring (2);\r
1098                                                 return va && pp_eq (ref s);\r
1099                                         } else {\r
1100                                                 Error_InvalidDirective ();\r
1101                                                 return false;\r
1102                                         }\r
1103                                 } \r
1104                         }\r
1105                         return va;\r
1106                 }\r
1107                 \r
1108                 //\r
1109                 // Evaluates an expression for `#if' or `#elif'\r
1110                 //\r
1111                 bool pp_expr (ref string s)\r
1112                 {\r
1113                         bool va = pp_and (ref s);\r
1114 \r
1115                         s = s.Trim ();\r
1116                         int len = s.Length;\r
1117                         if (len > 0){\r
1118                                 char c = s [0];\r
1119                                 \r
1120                                 if (c == '|'){\r
1121                                         if (len > 2 && s [1] == '|'){\r
1122                                                 s = s.Substring (2);\r
1123                                                 return va || pp_and (ref s);\r
1124                                         } else {\r
1125                                                 Error_InvalidDirective ();\r
1126                                                 return false;\r
1127                                         }\r
1128                                 } \r
1129                         }\r
1130 \r
1131                         return va;\r
1132                 }\r
1133 \r
1134                 bool eval (string s)\r
1135                 {\r
1136                         bool v = pp_expr (ref s);\r
1137                         s = s.Trim ();\r
1138                         if (s.Length != 0){\r
1139                                 Error_InvalidDirective ();\r
1140                                 return false;\r
1141                         }\r
1142 \r
1143                         return v;\r
1144                 }\r
1145                 \r
1146                 void Error_InvalidDirective ()\r
1147                 {\r
1148                         Report.Error (1517, Location, "Invalid pre-processor directive");\r
1149                 }\r
1150 \r
1151                 void Error_UnexpectedDirective (string extra)\r
1152                 {\r
1153                         Report.Error (\r
1154                                 1028, Location,\r
1155                                 "Unexpected processor directive (" + extra + ")");\r
1156                 }\r
1157 \r
1158                 void Error_TokensSeen ()\r
1159                 {\r
1160                         Report.Error (\r
1161                                 1032, Location,\r
1162                                 "Cannot define or undefine pre-processor symbols after a token in the file");\r
1163                 }\r
1164                 \r
1165                 //\r
1166                 // if true, then the code continues processing the code\r
1167                 // if false, the code stays in a loop until another directive is\r
1168                 // reached.\r
1169                 //\r
1170                 bool handle_preprocessing_directive (bool caller_is_taking)\r
1171                 {\r
1172                         char [] blank = { ' ', '\t' };\r
1173                         string cmd, arg;\r
1174                         \r
1175                         get_cmd_arg (out cmd, out arg);\r
1176 \r
1177                         //\r
1178                         // The first group of pre-processing instructions is always processed\r
1179                         //\r
1180                         switch (cmd){\r
1181                         case "line":\r
1182                                 if (!PreProcessLine (arg))\r
1183                                         Report.Error (\r
1184                                                 1576, Location,\r
1185                                                 "Argument to #line directive is missing or invalid");\r
1186                                 return true;\r
1187 \r
1188                         case "region":\r
1189                                 arg = "true";\r
1190                                 goto case "if";\r
1191 \r
1192                         case "endregion":\r
1193                                 goto case "endif";\r
1194                                 \r
1195                         case "if":\r
1196                                 if (arg == ""){\r
1197                                         Error_InvalidDirective ();\r
1198                                         return true;\r
1199                                 }\r
1200                                 bool taking = false;\r
1201                                 if (ifstack == null)\r
1202                                         ifstack = new Stack ();\r
1203 \r
1204                                 if (ifstack.Count == 0){\r
1205                                         taking = true;\r
1206                                 } else {\r
1207                                         int state = (int) ifstack.Peek ();\r
1208                                         if ((state & TAKING) != 0)\r
1209                                                 taking = true;\r
1210                                 }\r
1211                                         \r
1212                                 if (eval (arg) && taking){\r
1213                                         ifstack.Push (TAKING | TAKEN_BEFORE | PARENT_TAKING);\r
1214                                         return true;\r
1215                                 } else {\r
1216                                         ifstack.Push (taking ? PARENT_TAKING : 0);\r
1217                                         return false;\r
1218                                 }\r
1219                                 \r
1220                         case "endif":\r
1221                                 if (ifstack == null || ifstack.Count == 0){\r
1222                                         Error_UnexpectedDirective ("no #if for this #endif");\r
1223                                         return true;\r
1224                                 } else {\r
1225                                         ifstack.Pop ();\r
1226                                         if (ifstack.Count == 0)\r
1227                                                 return true;\r
1228                                         else {\r
1229                                                 int state = (int) ifstack.Peek ();\r
1230 \r
1231                                                 if ((state & TAKING) != 0)\r
1232                                                         return true;\r
1233                                                 else\r
1234                                                         return false;\r
1235                                         }\r
1236                                 }\r
1237 \r
1238                         case "elif":\r
1239                                 if (ifstack == null || ifstack.Count == 0){\r
1240                                         Error_UnexpectedDirective ("no #if for this #elif");\r
1241                                         return true;\r
1242                                 } else {\r
1243                                         int state = (int) ifstack.Peek ();\r
1244 \r
1245                                         if ((state & ELSE_SEEN) != 0){\r
1246                                                 Error_UnexpectedDirective ("#elif not valid after #else");\r
1247                                                 return true;\r
1248                                         }\r
1249 \r
1250                                         if ((state & (TAKEN_BEFORE | TAKING)) != 0)\r
1251                                                 return false;\r
1252 \r
1253                                         if (eval (arg) && ((state & PARENT_TAKING) != 0)){\r
1254                                                 state = (int) ifstack.Pop ();\r
1255                                                 ifstack.Push (state | TAKING | TAKEN_BEFORE);\r
1256                                                 return true;\r
1257                                         } else \r
1258                                                 return false;\r
1259                                 }\r
1260 \r
1261                         case "else":\r
1262                                 if (ifstack == null || ifstack.Count == 0){\r
1263                                         Report.Error (\r
1264                                                 1028, Location,\r
1265                                                 "Unexpected processor directive (no #if for this #else)");\r
1266                                         return true;\r
1267                                 } else {\r
1268                                         int state = (int) ifstack.Peek ();\r
1269 \r
1270                                         if ((state & ELSE_SEEN) != 0){\r
1271                                                 Error_UnexpectedDirective ("#else within #else");\r
1272                                                 return true;\r
1273                                         }\r
1274 \r
1275                                         ifstack.Pop ();\r
1276                                         ifstack.Push (state | ELSE_SEEN);\r
1277 \r
1278                                         if ((state & TAKEN_BEFORE) == 0){\r
1279                                                 if ((state & PARENT_TAKING) != 0)\r
1280                                                         return true;\r
1281                                                 else\r
1282                                                         return false;\r
1283                                         }\r
1284                                         return false;\r
1285                                 }\r
1286                         }\r
1287 \r
1288                         //\r
1289                         // These are only processed if we are in a `taking' block\r
1290                         //\r
1291                         if (!caller_is_taking)\r
1292                                 return false;\r
1293                                         \r
1294                         switch (cmd){\r
1295                         case "define":\r
1296                                 if (any_token_seen){\r
1297                                         Error_TokensSeen ();\r
1298                                         return true;\r
1299                                 }\r
1300                                 PreProcessDefinition (true, arg);\r
1301                                 return true;\r
1302 \r
1303                         case "undef":\r
1304                                 if (any_token_seen){\r
1305                                         Error_TokensSeen ();\r
1306                                         return true;\r
1307                                 }\r
1308                                 PreProcessDefinition (false, arg);\r
1309                                 return true;\r
1310 \r
1311                         case "error":\r
1312                                 Report.Error (1029, Location, "#error: '" + arg + "'");\r
1313                                 return true;\r
1314 \r
1315                         case "warning":\r
1316                                 Report.Warning (1030, Location, "#warning: '" + arg + "'");\r
1317                                 return true;\r
1318                         }\r
1319 \r
1320                         Report.Error (1024, Location, "Preprocessor directive expected (got: " + cmd + ")");\r
1321                         return true;\r
1322                 }\r
1323                 \r
1324                 public int xtoken ()\r
1325                 {\r
1326                         int t;\r
1327                         bool allow_keyword_as_ident = false;\r
1328                         bool doread = false;\r
1329                         int c;\r
1330 \r
1331                         val = null;\r
1332                         // optimization: eliminate col and implement #directive semantic correctly.\r
1333                         for (;(c = getChar ()) != -1; col++) {\r
1334                                 if (Char.IsLetter ((char)c) || c == '_'){\r
1335                                         string ids;\r
1336 \r
1337                                         id_builder.Length = 0;\r
1338                                         tokens_seen = true;\r
1339                                         id_builder.Append ((char) c);\r
1340                                         \r
1341                                         while ((c = peekChar ()) != -1) {\r
1342                                                 if (is_identifier_part_character ((char) c)){\r
1343                                                         id_builder.Append ((char)getChar ());\r
1344                                                         col++;\r
1345                                                 } else \r
1346                                                         break;\r
1347                                         }\r
1348                                         \r
1349                                         ids = id_builder.ToString ();\r
1350 \r
1351                                         if (!is_keyword (ids) || allow_keyword_as_ident) {\r
1352                                                 val = ids;\r
1353                                                 if (ids.Length > 512){\r
1354                                                         Report.Error (\r
1355                                                                 645, Location,\r
1356                                                                 "Identifier too long (limit is 512 chars)");\r
1357                                                 }\r
1358                                                 allow_keyword_as_ident = false;\r
1359                                                 return Token.IDENTIFIER;\r
1360                                         }\r
1361 \r
1362                                         // true, false and null are in the hash anyway.\r
1363                                         return GetKeyword (ids);\r
1364 \r
1365                                 }\r
1366 \r
1367                                 if (c == '.'){\r
1368                                         tokens_seen = true;\r
1369                                         if (Char.IsDigit ((char) peekChar ()))\r
1370                                                 return is_number (c);\r
1371                                         return Token.DOT;\r
1372                                 }\r
1373                                 \r
1374                                 if (Char.IsDigit ((char) c)){\r
1375                                         tokens_seen = true;\r
1376                                         return is_number (c);\r
1377                                 }\r
1378 \r
1379                                 // Handle double-slash comments.\r
1380                                 if (c == '/'){\r
1381                                         int d = peekChar ();\r
1382                                 \r
1383                                         if (d == '/'){\r
1384                                                 getChar ();\r
1385                                                 while ((d = getChar ()) != -1 && (d != '\n'))\r
1386                                                         col++;\r
1387                                                 line++;\r
1388                                                 ref_line++;\r
1389                                                 col = 0;\r
1390                                                 any_token_seen |= tokens_seen;\r
1391                                                 tokens_seen = false;\r
1392                                                 continue;\r
1393                                         } else if (d == '*'){\r
1394                                                 getChar ();\r
1395 \r
1396                                                 while ((d = getChar ()) != -1){\r
1397                                                         if (d == '*' && peekChar () == '/'){\r
1398                                                                 getChar ();\r
1399                                                                 col++;\r
1400                                                                 break;\r
1401                                                         }\r
1402                                                         if (d == '\n'){\r
1403                                                                 line++;\r
1404                                                                 ref_line++;\r
1405                                                                 col = 0;\r
1406                                                                 any_token_seen |= tokens_seen;\r
1407                                                                 tokens_seen = false;\r
1408                                                         }\r
1409                                                 }\r
1410                                                 continue;\r
1411                                         }\r
1412                                 }\r
1413 \r
1414                                 /* For now, ignore pre-processor commands */\r
1415                                 // FIXME: In C# the '#' is not limited to appear\r
1416                                 // on the first column.\r
1417                                 if (c == '#' && !tokens_seen){\r
1418                                         bool cont = true;\r
1419                                         \r
1420                                 start_again:\r
1421                                         \r
1422                                         cont = handle_preprocessing_directive (cont);\r
1423 \r
1424                                         if (cont){\r
1425                                                 col = 0;\r
1426                                                 continue;\r
1427                                         }\r
1428                                         col = 1;\r
1429 \r
1430                                         bool skipping = false;\r
1431                                         for (;(c = getChar ()) != -1; col++){\r
1432                                                 if (c == '\n'){\r
1433                                                         col = 0;\r
1434                                                         line++;\r
1435                                                         ref_line++;\r
1436                                                         skipping = false;\r
1437                                                 } else if (c == ' ' || c == '\t' || c == '\v' || c == '\r')\r
1438                                                         continue;\r
1439                                                 else if (c != '#')\r
1440                                                         skipping = true;\r
1441                                                 if (c == '#' && !skipping)\r
1442                                                         goto start_again;\r
1443                                         }\r
1444                                         any_token_seen |= tokens_seen;\r
1445                                         tokens_seen = false;\r
1446                                         if (c == -1)\r
1447                                                 Report.Error (1027, Location, "#endif expected");\r
1448                                         continue;\r
1449                                 }\r
1450                                 \r
1451                                 if ((t = is_punct ((char)c, ref doread)) != Token.ERROR){\r
1452                                         tokens_seen = true;\r
1453                                         if (doread){\r
1454                                                 getChar ();\r
1455                                                 col++;\r
1456                                         }\r
1457                                         return t;\r
1458                                 }\r
1459                                 \r
1460                                 if (c == '"'){\r
1461                                         string_builder.Length = 0;\r
1462                                         \r
1463                                         tokens_seen = true;\r
1464                                         \r
1465                                         while ((c = getChar ()) != -1){\r
1466                                                 if (c == '"'){\r
1467                                                         if (allow_keyword_as_ident && peekChar () == '"'){\r
1468                                                                 string_builder.Append ((char) c);\r
1469                                                                 getChar ();\r
1470                                                                 continue;\r
1471                                                         } \r
1472                                                         allow_keyword_as_ident = false;\r
1473                                                         val = string_builder.ToString ();\r
1474                                                         return Token.LITERAL_STRING;\r
1475                                                 }\r
1476 \r
1477                                                 if (!allow_keyword_as_ident){\r
1478                                                         c = escape (c);\r
1479                                                         if (c == -1)\r
1480                                                                 return Token.ERROR;\r
1481                                                 }\r
1482                                                 string_builder.Append ((char) c);\r
1483                                         }\r
1484                                 }\r
1485 \r
1486                                 if (c == '\''){\r
1487                                         c = getChar ();\r
1488                                         tokens_seen = true;\r
1489                                         if (c == '\''){\r
1490                                                 error_details = "Empty character literal";\r
1491                                                 Report.Error (1011, Location, error_details);\r
1492                                                 return Token.ERROR;\r
1493                                         }\r
1494                                         c = escape (c);\r
1495                                         if (c == -1)\r
1496                                                 return Token.ERROR;\r
1497                                         val = new System.Char ();\r
1498                                         val = (char) c;\r
1499                                         c = getChar ();\r
1500 \r
1501                                         if (c != '\''){\r
1502                                                 error_details = "Too many characters in character literal";\r
1503                                                 Report.Error (1012, Location, error_details);\r
1504 \r
1505                                                 // Try to recover, read until newline or next "'"\r
1506                                                 while ((c = getChar ()) != -1){\r
1507                                                         if (c == '\n' || c == '\'')\r
1508                                                                 break;\r
1509                                                         \r
1510                                                 }\r
1511                                                 return Token.ERROR;\r
1512                                         }\r
1513                                         return Token.LITERAL_CHARACTER;\r
1514                                 }\r
1515                                 \r
1516                                 // white space\r
1517                                 if (c == '\n'){\r
1518                                         line++;\r
1519                                         ref_line++;\r
1520                                         col = 0;\r
1521                                         any_token_seen |= tokens_seen;\r
1522                                         tokens_seen = false;\r
1523                                         continue;\r
1524                                 }\r
1525 \r
1526                                 if (c == ' ' || c == '\t' || c == '\f' || c == '\v' || c == '\r'){\r
1527                                         if (c == '\t')\r
1528                                                 col = (((col + 8) / 8) * 8) - 1;\r
1529                                         continue;\r
1530                                 }\r
1531 \r
1532                                 if (c == '@'){\r
1533                                         tokens_seen = true;\r
1534                                         allow_keyword_as_ident = true;\r
1535                                         continue;\r
1536                                 }\r
1537 \r
1538                                 error_details = ((char)c).ToString ();\r
1539                                 \r
1540                                 return Token.ERROR;\r
1541                         }\r
1542 \r
1543                         if (ifstack != null && ifstack.Count > 1)\r
1544                                 Report.Error (1027, Location, "#endif expected");\r
1545                         return Token.EOF;\r
1546                 }\r
1547         }\r
1548 }\r
1549 \r