mcs/mcs/cs-tokenizer.cs

   1 //\r
   2 // cs-tokenizer.cs: The Tokenizer for the C# compiler\r
   3 //                  This also implements the preprocessor\r
   4 //\r
   5 // Author: Miguel de Icaza (miguel@gnu.org)\r
   6 //\r
   7 // Licensed under the terms of the GNU GPL\r
   8 //\r
   9 // (C) 2001 Ximian, Inc (http://www.ximian.com)\r
  10 //\r
  11 \r
  12 /*\r
  13  * TODO:\r
  14  *   Make sure we accept the proper Unicode ranges, per the spec.\r
  15  *   Report error 1032\r
  16 */\r
  17 \r
  18 using System;\r
  19 using System.Text;\r
  20 using System.Collections;\r
  21 using System.IO;\r
  22 using System.Globalization;\r
  23 \r
  24 namespace Mono.CSharp\r
  25 {\r
  26         /// <summary>\r
  27         ///    Tokenizer for C# source code. \r
  28         /// </summary>\r
  29 \r
  30         public class Tokenizer : yyParser.yyInput\r
  31         {\r
  32                 StreamReader reader;\r
  33                 public string ref_name;\r
  34                 public int ref_line = 1;\r
  35                 public int line = 1;\r
  36                 public int col = 1;\r
  37                 public int current_token;\r
  38                 bool handle_get_set = false;\r
  39                 bool handle_remove_add = false;\r
  40                 bool handle_assembly = false;\r
  41 \r
  42                 //\r
  43                 // Whether tokens have been seen on this line\r
  44                 //\r
  45                 bool tokens_seen = false;\r
  46                 \r
  47                 //\r
  48                 // Returns a verbose representation of the current location\r
  49                 //\r
  50                 public string location {\r
  51                         get {\r
  52                                 string det;\r
  53 \r
  54                                 if (current_token == Token.ERROR)\r
  55                                         det = "detail: " + error_details;\r
  56                                 else\r
  57                                         det = "";\r
  58                                 \r
  59                                 // return "Line:     "+line+" Col: "+col + "\n" +\r
  60                                 //       "VirtLine: "+ref_line +\r
  61                                 //       " Token: "+current_token + " " + det;\r
  62 \r
  63                                 return ref_name + " " + "(" + line + "," + col + "), Token:" + current_token + " " + det;\r
  64                         }\r
  65                 }\r
  66 \r
  67                 public bool PropertyParsing {\r
  68                         get {\r
  69                                 return handle_get_set;\r
  70                         }\r
  71 \r
  72                         set {\r
  73                                 handle_get_set = value;\r
  74                         }\r
  75                 }\r
  76 \r
  77                 public bool AssemblyTargetParsing {\r
  78                         get {\r
  79                                 return handle_assembly;\r
  80                         }\r
  81 \r
  82                         set {\r
  83                                 handle_assembly = value;\r
  84                         }\r
  85                 }\r
  86 \r
  87                 public bool EventParsing {\r
  88                         get {\r
  89                                 return handle_remove_add;\r
  90                         }\r
  91 \r
  92                         set {\r
  93                                 handle_remove_add = value;\r
  94                         }\r
  95                 }\r
  96                 \r
  97                 //\r
  98                 // Class variables\r
  99                 // \r
 100                 static Hashtable keywords;\r
 101                 static NumberStyles styles;\r
 102                 static NumberFormatInfo csharp_format_info;\r
 103                 \r
 104                 //\r
 105                 // Values for the associated token returned\r
 106                 //\r
 107                 System.Text.StringBuilder number;\r
 108                 int putback_char;\r
 109                 Object val;\r
 110 \r
 111                 //\r
 112                 // Pre-processor\r
 113                 //\r
 114                 Hashtable defines;\r
 115 \r
 116                 const int TAKING        = 1;\r
 117                 const int TAKEN_BEFORE  = 2;\r
 118                 const int ELSE_SEEN     = 4;\r
 119                 const int PARENT_TAKING = 8;\r
 120                 \r
 121                 //\r
 122                 // pre-processor if stack state:\r
 123                 //\r
 124                 Stack ifstack;\r
 125                 \r
 126                 //\r
 127                 // Details about the error encoutered by the tokenizer\r
 128                 //\r
 129                 string error_details;\r
 130                 \r
 131                 public string error {\r
 132                         get {\r
 133                                 return error_details;\r
 134                         }\r
 135                 }\r
 136                 \r
 137                 public int Line {\r
 138                         get {\r
 139                                 return line;\r
 140                         }\r
 141                 }\r
 142 \r
 143                 public int Col {\r
 144                         get {\r
 145                                 return col;\r
 146                         }\r
 147                 }\r
 148                 \r
 149                 static void InitTokens ()\r
 150                 {\r
 151                         keywords = new Hashtable ();\r
 152 \r
 153                         keywords.Add ("abstract", Token.ABSTRACT);\r
 154                         keywords.Add ("as", Token.AS);\r
 155                         keywords.Add ("add", Token.ADD);\r
 156                         keywords.Add ("assembly", Token.ASSEMBLY);\r
 157                         keywords.Add ("base", Token.BASE);\r
 158                         keywords.Add ("bool", Token.BOOL);\r
 159                         keywords.Add ("break", Token.BREAK);\r
 160                         keywords.Add ("byte", Token.BYTE);\r
 161                         keywords.Add ("case", Token.CASE);\r
 162                         keywords.Add ("catch", Token.CATCH);\r
 163                         keywords.Add ("char", Token.CHAR);\r
 164                         keywords.Add ("checked", Token.CHECKED);\r
 165                         keywords.Add ("class", Token.CLASS);\r
 166                         keywords.Add ("const", Token.CONST);\r
 167                         keywords.Add ("continue", Token.CONTINUE);\r
 168                         keywords.Add ("decimal", Token.DECIMAL);\r
 169                         keywords.Add ("default", Token.DEFAULT);\r
 170                         keywords.Add ("delegate", Token.DELEGATE);\r
 171                         keywords.Add ("do", Token.DO);\r
 172                         keywords.Add ("double", Token.DOUBLE);\r
 173                         keywords.Add ("else", Token.ELSE);\r
 174                         keywords.Add ("enum", Token.ENUM);\r
 175                         keywords.Add ("event", Token.EVENT);\r
 176                         keywords.Add ("explicit", Token.EXPLICIT);\r
 177                         keywords.Add ("extern", Token.EXTERN);\r
 178                         keywords.Add ("false", Token.FALSE);\r
 179                         keywords.Add ("finally", Token.FINALLY);\r
 180                         keywords.Add ("fixed", Token.FIXED);\r
 181                         keywords.Add ("float", Token.FLOAT);\r
 182                         keywords.Add ("for", Token.FOR);\r
 183                         keywords.Add ("foreach", Token.FOREACH);\r
 184                         keywords.Add ("goto", Token.GOTO);\r
 185                         keywords.Add ("get", Token.GET);\r
 186                         keywords.Add ("if", Token.IF);\r
 187                         keywords.Add ("implicit", Token.IMPLICIT);\r
 188                         keywords.Add ("in", Token.IN);\r
 189                         keywords.Add ("int", Token.INT);\r
 190                         keywords.Add ("interface", Token.INTERFACE);\r
 191                         keywords.Add ("internal", Token.INTERNAL);\r
 192                         keywords.Add ("is", Token.IS);\r
 193                         keywords.Add ("lock", Token.LOCK);\r
 194                         keywords.Add ("long", Token.LONG);\r
 195                         keywords.Add ("namespace", Token.NAMESPACE);\r
 196                         keywords.Add ("new", Token.NEW);\r
 197                         keywords.Add ("null", Token.NULL);\r
 198                         keywords.Add ("object", Token.OBJECT);\r
 199                         keywords.Add ("operator", Token.OPERATOR);\r
 200                         keywords.Add ("out", Token.OUT);\r
 201                         keywords.Add ("override", Token.OVERRIDE);\r
 202                         keywords.Add ("params", Token.PARAMS);\r
 203                         keywords.Add ("private", Token.PRIVATE);\r
 204                         keywords.Add ("protected", Token.PROTECTED);\r
 205                         keywords.Add ("public", Token.PUBLIC);\r
 206                         keywords.Add ("readonly", Token.READONLY);\r
 207                         keywords.Add ("ref", Token.REF);\r
 208                         keywords.Add ("remove", Token.REMOVE);\r
 209                         keywords.Add ("return", Token.RETURN);\r
 210                         keywords.Add ("sbyte", Token.SBYTE);\r
 211                         keywords.Add ("sealed", Token.SEALED);\r
 212                         keywords.Add ("set", Token.SET);\r
 213                         keywords.Add ("short", Token.SHORT);\r
 214                         keywords.Add ("sizeof", Token.SIZEOF);\r
 215                         keywords.Add ("stackalloc", Token.STACKALLOC);\r
 216                         keywords.Add ("static", Token.STATIC);\r
 217                         keywords.Add ("string", Token.STRING);\r
 218                         keywords.Add ("struct", Token.STRUCT);\r
 219                         keywords.Add ("switch", Token.SWITCH);\r
 220                         keywords.Add ("this", Token.THIS);\r
 221                         keywords.Add ("throw", Token.THROW);\r
 222                         keywords.Add ("true", Token.TRUE);\r
 223                         keywords.Add ("try", Token.TRY);\r
 224                         keywords.Add ("typeof", Token.TYPEOF);\r
 225                         keywords.Add ("uint", Token.UINT);\r
 226                         keywords.Add ("ulong", Token.ULONG);\r
 227                         keywords.Add ("unchecked", Token.UNCHECKED);\r
 228                         keywords.Add ("unsafe", Token.UNSAFE);\r
 229                         keywords.Add ("ushort", Token.USHORT);\r
 230                         keywords.Add ("using", Token.USING);\r
 231                         keywords.Add ("virtual", Token.VIRTUAL);\r
 232                         keywords.Add ("void", Token.VOID);\r
 233                         keywords.Add ("volatile", Token.VOLATILE);\r
 234                         keywords.Add ("while", Token.WHILE);\r
 235                 }\r
 236 \r
 237                 //\r
 238                 // Class initializer\r
 239                 // \r
 240                 static Tokenizer ()\r
 241                 {\r
 242                         InitTokens ();\r
 243                         csharp_format_info = new NumberFormatInfo ();\r
 244                         csharp_format_info.CurrencyDecimalSeparator = ".";\r
 245                         styles = NumberStyles.AllowExponent | NumberStyles.AllowDecimalPoint;\r
 246                 }\r
 247 \r
 248                 bool is_keyword (string name)\r
 249                 {\r
 250                         bool res;\r
 251                         \r
 252                         res = keywords.Contains (name);\r
 253                         if (handle_get_set == false && (name == "get" || name == "set"))\r
 254                                 return false;\r
 255                         if (handle_remove_add == false && (name == "remove" || name == "add"))\r
 256                                 return false;\r
 257                         if (handle_assembly == false && (name == "assembly"))\r
 258                                 return false;\r
 259                         return res;\r
 260                 }\r
 261 \r
 262                 int GetKeyword (string name)\r
 263                 {\r
 264                         return (int) (keywords [name]);\r
 265                 }\r
 266 \r
 267                 public Location Location {\r
 268                         get {\r
 269                                 return new Location (ref_line);\r
 270                         }\r
 271                 }\r
 272                 \r
 273                 public Tokenizer (System.IO.Stream input, string fname, ArrayList defs)\r
 274                 {\r
 275                         this.ref_name = fname;\r
 276                         reader = new System.IO.StreamReader (input);\r
 277                         putback_char = -1;\r
 278 \r
 279                         if (defs != null){\r
 280                                 defines = new Hashtable ();\r
 281                                 foreach (string def in defs)\r
 282                                         defines [def] = true;\r
 283                         }\r
 284 \r
 285                         //\r
 286                         // FIXME: This could be `Location.Push' but we have to\r
 287                         // find out why the MS compiler allows this\r
 288                         //\r
 289                         Mono.CSharp.Location.Push (fname);\r
 290                 }\r
 291 \r
 292                 bool is_identifier_start_character (char c)\r
 293                 {\r
 294                         return Char.IsLetter (c) || c == '_' ;\r
 295                 }\r
 296 \r
 297                 bool is_identifier_part_character (char c)\r
 298                 {\r
 299                         return (Char.IsLetter (c) || Char.IsDigit (c) || c == '_');\r
 300                 }\r
 301 \r
 302                 int is_punct (char c, ref bool doread)\r
 303                 {\r
 304                         int d;\r
 305                         int t;\r
 306 \r
 307                         doread = false;\r
 308 \r
 309                         switch (c){\r
 310                         case '{':\r
 311                                 return Token.OPEN_BRACE;\r
 312                         case '}':\r
 313                                 return Token.CLOSE_BRACE;\r
 314                         case '[':\r
 315                                 return Token.OPEN_BRACKET;\r
 316                         case ']':\r
 317                                 return Token.CLOSE_BRACKET;\r
 318                         case '(':\r
 319                                 return Token.OPEN_PARENS;\r
 320                         case ')':\r
 321                                 return Token.CLOSE_PARENS;\r
 322                         case ',':\r
 323                                 return Token.COMMA;\r
 324                         case ':':\r
 325                                 return Token.COLON;\r
 326                         case ';':\r
 327                                 return Token.SEMICOLON;\r
 328                         case '~':\r
 329                                 return Token.TILDE;\r
 330                         case '?':\r
 331                                 return Token.INTERR;\r
 332                         }\r
 333 \r
 334                         d = peekChar ();\r
 335                         if (c == '+'){\r
 336                                 \r
 337                                 if (d == '+')\r
 338                                         t = Token.OP_INC;\r
 339                                 else if (d == '=')\r
 340                                         t = Token.OP_ADD_ASSIGN;\r
 341                                 else\r
 342                                         return Token.PLUS;\r
 343                                 doread = true;\r
 344                                 return t;\r
 345                         }\r
 346                         if (c == '-'){\r
 347                                 if (d == '-')\r
 348                                         t = Token.OP_DEC;\r
 349                                 else if (d == '=')\r
 350                                         t = Token.OP_SUB_ASSIGN;\r
 351                                 else if (d == '>')\r
 352                                         t = Token.OP_PTR;\r
 353                                 else\r
 354                                         return Token.MINUS;\r
 355                                 doread = true;\r
 356                                 return t;\r
 357                         }\r
 358 \r
 359                         if (c == '!'){\r
 360                                 if (d == '='){\r
 361                                         doread = true;\r
 362                                         return Token.OP_NE;\r
 363                                 }\r
 364                                 return Token.BANG;\r
 365                         }\r
 366 \r
 367                         if (c == '='){\r
 368                                 if (d == '='){\r
 369                                         doread = true;\r
 370                                         return Token.OP_EQ;\r
 371                                 }\r
 372                                 return Token.ASSIGN;\r
 373                         }\r
 374 \r
 375                         if (c == '&'){\r
 376                                 if (d == '&'){\r
 377                                         doread = true;\r
 378                                         return Token.OP_AND;\r
 379                                 } else if (d == '='){\r
 380                                         doread = true;\r
 381                                         return Token.OP_AND_ASSIGN;\r
 382                                 }\r
 383                                 return Token.BITWISE_AND;\r
 384                         }\r
 385 \r
 386                         if (c == '|'){\r
 387                                 if (d == '|'){\r
 388                                         doread = true;\r
 389                                         return Token.OP_OR;\r
 390                                 } else if (d == '='){\r
 391                                         doread = true;\r
 392                                         return Token.OP_OR_ASSIGN;\r
 393                                 }\r
 394                                 return Token.BITWISE_OR;\r
 395                         }\r
 396 \r
 397                         if (c == '*'){\r
 398                                 if (d == '='){\r
 399                                         doread = true;\r
 400                                         return Token.OP_MULT_ASSIGN;\r
 401                                 }\r
 402                                 return Token.STAR;\r
 403                         }\r
 404 \r
 405                         if (c == '/'){\r
 406                                 if (d == '='){\r
 407                                         doread = true;\r
 408                                         return Token.OP_DIV_ASSIGN;\r
 409                                 }\r
 410                                 return Token.DIV;\r
 411                         }\r
 412 \r
 413                         if (c == '%'){\r
 414                                 if (d == '='){\r
 415                                         doread = true;\r
 416                                         return Token.OP_MOD_ASSIGN;\r
 417                                 }\r
 418                                 return Token.PERCENT;\r
 419                         }\r
 420 \r
 421                         if (c == '^'){\r
 422                                 if (d == '='){\r
 423                                         doread = true;\r
 424                                         return Token.OP_XOR_ASSIGN;\r
 425                                 }\r
 426                                 return Token.CARRET;\r
 427                         }\r
 428 \r
 429                         if (c == '<'){\r
 430                                 if (d == '<'){\r
 431                                         getChar ();\r
 432                                         d = peekChar ();\r
 433 \r
 434                                         if (d == '='){\r
 435                                                 doread = true;\r
 436                                                 return Token.OP_SHIFT_LEFT_ASSIGN;\r
 437                                         }\r
 438                                         return Token.OP_SHIFT_LEFT;\r
 439                                 } else if (d == '='){\r
 440                                         doread = true;\r
 441                                         return Token.OP_LE;\r
 442                                 }\r
 443                                 return Token.OP_LT;\r
 444                         }\r
 445 \r
 446                         if (c == '>'){\r
 447                                 if (d == '>'){\r
 448                                         getChar ();\r
 449                                         d = peekChar ();\r
 450 \r
 451                                         if (d == '='){\r
 452                                                 doread = true;\r
 453                                                 return Token.OP_SHIFT_RIGHT_ASSIGN;\r
 454                                         }\r
 455                                         return Token.OP_SHIFT_RIGHT;\r
 456                                 } else if (d == '='){\r
 457                                         doread = true;\r
 458                                         return Token.OP_GE;\r
 459                                 }\r
 460                                 return Token.OP_GT;\r
 461                         }\r
 462                         return Token.ERROR;\r
 463                 }\r
 464 \r
 465                 bool decimal_digits (int c)\r
 466                 {\r
 467                         int d;\r
 468                         bool seen_digits = false;\r
 469                         \r
 470                         if (c != -1)\r
 471                                 number.Append ((char) c);\r
 472                         \r
 473                         while ((d = peekChar ()) != -1){\r
 474                                 if (Char.IsDigit ((char)d)){\r
 475                                         number.Append ((char) d);\r
 476                                         getChar ();\r
 477                                         seen_digits = true;\r
 478                                 } else\r
 479                                         break;\r
 480                         }\r
 481                         \r
 482                         return seen_digits;\r
 483                 }\r
 484 \r
 485                 bool is_hex (char e)\r
 486                 {\r
 487                         return Char.IsDigit (e) || (e >= 'A' && e <= 'F');\r
 488                 }\r
 489                 \r
 490                 void hex_digits (int c)\r
 491                 {\r
 492                         int d;\r
 493 \r
 494                         if (c != -1)\r
 495                                 number.Append ((char) c);\r
 496                         while ((d = peekChar ()) != -1){\r
 497                                 char e = Char.ToUpper ((char) d);\r
 498                                 \r
 499                                 if (is_hex (e)){\r
 500                                         number.Append ((char) e);\r
 501                                         getChar ();\r
 502                                 } else\r
 503                                         break;\r
 504                         }\r
 505                 }\r
 506                 \r
 507                 int real_type_suffix (int c)\r
 508                 {\r
 509                         int t;\r
 510 \r
 511                         switch (c){\r
 512                         case 'F': case 'f':\r
 513                                 t =  Token.LITERAL_FLOAT;\r
 514                                 break;\r
 515                         case 'D': case 'd':\r
 516                                 t = Token.LITERAL_DOUBLE;\r
 517                                 break;\r
 518                         case 'M': case 'm':\r
 519                                  t= Token.LITERAL_DECIMAL;\r
 520                                 break;\r
 521                         default:\r
 522                                 return Token.NONE;\r
 523                         }\r
 524                         return t;\r
 525                 }\r
 526 \r
 527                 int integer_type_suffix (ulong ul, int c)\r
 528                 {\r
 529                         bool is_unsigned = false;\r
 530                         bool is_long = false;\r
 531 \r
 532                         if (c != -1){\r
 533                                 bool scanning = true;\r
 534                                 do {\r
 535                                         switch (c){\r
 536                                         case 'U': case 'u':\r
 537                                                 if (is_unsigned)\r
 538                                                         scanning = false;\r
 539                                                 is_unsigned = true;\r
 540                                                 getChar ();\r
 541                                                 break;\r
 542 \r
 543                                         case 'l':\r
 544                                                 if (!is_unsigned){\r
 545                                                         //\r
 546                                                         // if we have not seen anything in between\r
 547                                                         // report this error\r
 548                                                         //\r
 549                                                         Report.Warning (\r
 550                                                                 78, Location,\r
 551                                                         "the 'l' suffix is easily confused with digit `1'," +\r
 552                                                         " use 'L' for clarity");\r
 553                                                 }\r
 554                                                 goto case 'L';\r
 555                                                 \r
 556                                         case 'L': \r
 557                                                 if (is_long)\r
 558                                                         scanning = false;\r
 559                                                 is_long = true;\r
 560                                                 getChar ();\r
 561                                                 break;\r
 562                                                 \r
 563                                         default:\r
 564                                                 scanning = false;\r
 565                                                 break;\r
 566                                         }\r
 567                                         c = peekChar ();\r
 568                                 } while (scanning);\r
 569                         }\r
 570 \r
 571                         if (is_long && is_unsigned){\r
 572                                 val = ul;\r
 573                                 return Token.LITERAL_INTEGER;\r
 574                         } else if (is_unsigned){\r
 575                                 // uint if possible, or ulong else.\r
 576 \r
 577                                 if ((ul & 0xffffffff00000000) == 0)\r
 578                                         val = (uint) ul;\r
 579                                 else\r
 580                                         val = ul;\r
 581                         } else if (is_long){\r
 582                                 // long if possible, ulong otherwise\r
 583                                 if ((ul & 0x8000000000000000) != 0)\r
 584                                         val = ul;\r
 585                                 else\r
 586                                         val = (long) ul;\r
 587                         } else {\r
 588                                 // int, uint, long or ulong in that order\r
 589                                 if ((ul & 0xffffffff00000000) == 0){\r
 590                                         uint ui = (uint) ul;\r
 591                                         \r
 592                                         if ((ui & 0x80000000) != 0)\r
 593                                                 val = ui;\r
 594                                         else\r
 595                                                 val = (int) ui;\r
 596                                 } else {\r
 597                                         if ((ul & 0x8000000000000000) != 0)\r
 598                                                 val = ul;\r
 599                                         else\r
 600                                                 val = (long) ul;\r
 601                                 }\r
 602                         }\r
 603                         return Token.LITERAL_INTEGER;\r
 604                 }\r
 605                                 \r
 606                 //\r
 607                 // given `c' as the next char in the input decide whether\r
 608                 // we need to convert to a special type, and then choose\r
 609                 // the best representation for the integer\r
 610                 //\r
 611                 int adjust_int (int c)\r
 612                 {\r
 613                         ulong ul = System.UInt64.Parse (number.ToString ());\r
 614                         return integer_type_suffix (ul, c);\r
 615                 }\r
 616 \r
 617                 int adjust_real (int t)\r
 618                 {\r
 619                         string s = number.ToString ();\r
 620 \r
 621                         switch (t){\r
 622                         case Token.LITERAL_DECIMAL:\r
 623                                 val = new System.Decimal ();\r
 624                                 val = System.Decimal.Parse (\r
 625                                         s, styles, csharp_format_info);\r
 626                                 break;\r
 627                         case Token.LITERAL_DOUBLE:\r
 628                                 val = new System.Double ();\r
 629                                 val = System.Double.Parse (\r
 630                                         s, styles, csharp_format_info);\r
 631                                 break;\r
 632                         case Token.LITERAL_FLOAT:\r
 633                                 val = new System.Double ();\r
 634                                 val = (float) System.Double.Parse (\r
 635                                         s, styles, csharp_format_info);\r
 636                                 break;\r
 637 \r
 638                         case Token.NONE:\r
 639                                 val = new System.Double ();\r
 640                                 val = System.Double.Parse (\r
 641                                         s, styles, csharp_format_info);\r
 642                                 t = Token.LITERAL_DOUBLE;\r
 643                                 break;\r
 644                         }\r
 645                         return t;\r
 646                 }\r
 647 \r
 648                 //\r
 649                 // Invoked if we know we have .digits or digits\r
 650                 //\r
 651                 int is_number (int c)\r
 652                 {\r
 653                         bool is_real = false;\r
 654                         number = new System.Text.StringBuilder ();\r
 655                         int type;\r
 656 \r
 657                         number.Length = 0;\r
 658 \r
 659                         if (Char.IsDigit ((char)c)){\r
 660                                 if (c == '0' && peekChar () == 'x' || peekChar () == 'X'){\r
 661                                         ulong ul;\r
 662                                         getChar ();\r
 663                                         hex_digits (-1);\r
 664 \r
 665                                         string s = number.ToString ();\r
 666 \r
 667                                         ul = System.UInt64.Parse (s, NumberStyles.HexNumber);\r
 668                                         return integer_type_suffix (ul, peekChar ());\r
 669                                 }\r
 670                                 decimal_digits (c);\r
 671                                 c = getChar ();\r
 672                         }\r
 673 \r
 674                         //\r
 675                         // We need to handle the case of\r
 676                         // "1.1" vs "1.string" (LITERAL_FLOAT vs NUMBER DOT IDENTIFIER)\r
 677                         //\r
 678                         if (c == '.'){\r
 679                                 if (decimal_digits ('.')){\r
 680                                         is_real = true;\r
 681                                         c = getChar ();\r
 682                                 } else {\r
 683                                         putback ('.');\r
 684                                         number.Length -= 1;\r
 685                                         return adjust_int (-1);\r
 686                                 }\r
 687                         }\r
 688                         \r
 689                         if (c == 'e' || c == 'E'){\r
 690                                 is_real = true;\r
 691                                 number.Append ("e");\r
 692                                 c = getChar ();\r
 693                                 \r
 694                                 if (c == '+'){\r
 695                                         number.Append ((char) c);\r
 696                                         c = getChar ();\r
 697                                 } else if (c == '-'){\r
 698                                         number.Append ((char) c);\r
 699                                         c = getChar ();\r
 700                                 }\r
 701                                 decimal_digits (-1);\r
 702                                 c = getChar ();\r
 703                         }\r
 704 \r
 705                         type = real_type_suffix (c);\r
 706                         if (type == Token.NONE && !is_real){\r
 707                                 putback (c);\r
 708                                 return adjust_int (c);\r
 709                         } else \r
 710                                 is_real = true;\r
 711 \r
 712                         if (type == Token.NONE){\r
 713                                 putback (c);\r
 714                         }\r
 715                         \r
 716                         if (is_real)\r
 717                                 return adjust_real (type);\r
 718 \r
 719                         Console.WriteLine ("This should not be reached");\r
 720                         throw new Exception ("Is Number should never reach this point");\r
 721                 }\r
 722 \r
 723                 //\r
 724                 // Accepts exactly count (4 or 8) hex, no more no less\r
 725                 //\r
 726                 int getHex (int count, out bool error)\r
 727                 {\r
 728                         int [] buffer = new int [8];\r
 729                         int i;\r
 730                         int total = 0;\r
 731                         int c;\r
 732                         char e;\r
 733                         int top = count != -1 ? count : 4;\r
 734                         \r
 735                         getChar ();\r
 736                         error = false;\r
 737                         for (i = 0; i < top; i++){\r
 738                                 c = getChar ();\r
 739                                 e = Char.ToUpper ((char) c);\r
 740                                 \r
 741                                 if (!is_hex (e)){\r
 742                                         error = true;\r
 743                                         return 0;\r
 744                                 }\r
 745                                 if (Char.IsDigit (e))\r
 746                                         c = (int) e - (int) '0';\r
 747                                 else\r
 748                                         c = (int) e - (int) 'A';\r
 749                                 total = (total * 16) + c;\r
 750                                 if (count == -1){\r
 751                                         int p = peekChar ();\r
 752                                         if (p == -1)\r
 753                                                 break;\r
 754                                         if (!is_hex ((char)p))\r
 755                                                 break;\r
 756                                 }\r
 757                         }\r
 758                         return total;\r
 759                 }\r
 760 \r
 761                 int escape (int c)\r
 762                 {\r
 763                         bool error;\r
 764                         int d;\r
 765                         int v;\r
 766 \r
 767                         d = peekChar ();\r
 768                         if (c != '\\')\r
 769                                 return c;\r
 770                         \r
 771                         switch (d){\r
 772                         case 'a':\r
 773                                 v = '\a'; break;\r
 774                         case 'b':\r
 775                                 v = '\b'; break;\r
 776                         case 'n':\r
 777                                 v = '\n'; break;\r
 778                         case 't':\r
 779                                 v = '\t'; break;\r
 780                         case 'v':\r
 781                                 v = '\v'; break;\r
 782                         case 'r':\r
 783                                 v = '\r'; break;\r
 784                         case '\\':\r
 785                                 v = '\\'; break;\r
 786                         case 'f':\r
 787                                 v = '\f'; break;\r
 788                         case '0':\r
 789                                 v = 0; break;\r
 790                         case '"':\r
 791                                 v = '"'; break;\r
 792                         case '\'':\r
 793                                 v = '\''; break;\r
 794                         case 'x':\r
 795                                 v = getHex (-1, out error);\r
 796                                 if (error)\r
 797                                         goto default;\r
 798                                 return v;\r
 799                         case 'u':\r
 800                                 v = getHex (4, out error);\r
 801                                 if (error)\r
 802                                         goto default;\r
 803                                 return v;\r
 804                         case 'U':\r
 805                                 v = getHex (8, out error);\r
 806                                 if (error)\r
 807                                         goto default;\r
 808                                 return v;\r
 809                         default:\r
 810                                 Report.Error (1009, Location, "Unrecognized escape sequence in " + (char)d);\r
 811                                 return -1;\r
 812                         }\r
 813                         getChar ();\r
 814                         return v;\r
 815                 }\r
 816 \r
 817                 int getChar ()\r
 818                 {\r
 819                         if (putback_char != -1){\r
 820                                 int x = putback_char;\r
 821                                 putback_char = -1;\r
 822 \r
 823                                 return x;\r
 824                         }\r
 825                         return reader.Read ();\r
 826                 }\r
 827 \r
 828                 int peekChar ()\r
 829                 {\r
 830                         if (putback_char != -1)\r
 831                                 return putback_char;\r
 832                         return reader.Peek ();\r
 833                 }\r
 834 \r
 835                 void putback (int c)\r
 836                 {\r
 837                         if (putback_char != -1)\r
 838                                 throw new Exception ("This should not happen putback on putback");\r
 839                         putback_char = c;\r
 840                 }\r
 841 \r
 842                 public bool advance ()\r
 843                 {\r
 844                         return peekChar () != -1;\r
 845                 }\r
 846 \r
 847                 public Object Value {\r
 848                         get {\r
 849                                 return val;\r
 850                         }\r
 851                 }\r
 852 \r
 853                 public Object value ()\r
 854                 {\r
 855                         return val;\r
 856                 }\r
 857                 \r
 858                 public int token ()\r
 859                 {\r
 860                         current_token = xtoken ();\r
 861                         return current_token;\r
 862                 }\r
 863 \r
 864                 static StringBuilder static_cmd_arg = new System.Text.StringBuilder ();\r
 865                 \r
 866                 void get_cmd_arg (out string cmd, out string arg)\r
 867                 {\r
 868                         int c;\r
 869                         \r
 870                         tokens_seen = false;\r
 871                         arg = "";\r
 872                         static_cmd_arg.Length = 0;\r
 873                                 \r
 874                         while ((c = getChar ()) != -1 && (c != '\n') && (c != ' ') && (c != '\t')){\r
 875                                 if (c == '\r')\r
 876                                         continue;\r
 877                                 static_cmd_arg.Append ((char) c);\r
 878                         }\r
 879 \r
 880                         cmd = static_cmd_arg.ToString ();\r
 881 \r
 882                         if (c == '\n'){\r
 883                                 line++;\r
 884                                 ref_line++;\r
 885                                 return;\r
 886                         }\r
 887 \r
 888                         // skip over white space\r
 889                         while ((c = getChar ()) != -1 && (c != '\n') && ((c == ' ') || (c == '\t')))\r
 890                                 ;\r
 891 \r
 892                         if (c == '\n'){\r
 893                                 line++;\r
 894                                 ref_line++;\r
 895                                 return;\r
 896                         }\r
 897                         \r
 898                         static_cmd_arg.Length = 0;\r
 899                         static_cmd_arg.Append ((char) c);\r
 900                         \r
 901                         while ((c = getChar ()) != -1 && (c != '\n')){\r
 902                                 if (c == '\r')\r
 903                                         continue;\r
 904                                 static_cmd_arg.Append ((char) c);\r
 905                         }\r
 906 \r
 907                         if (c == '\n'){\r
 908                                 line++;\r
 909                                 ref_line++;\r
 910                         }\r
 911                         arg = static_cmd_arg.ToString ().Trim ();\r
 912                 }\r
 913 \r
 914                 //\r
 915                 // Handles the #line directive\r
 916                 //\r
 917                 bool PreProcessLine (string arg)\r
 918                 {\r
 919                         if (arg == "")\r
 920                                 return false;\r
 921 \r
 922                         if (arg == "default"){\r
 923                                 line = ref_line = line;\r
 924                                 return false;\r
 925                         }\r
 926                         \r
 927                         try {\r
 928                                 int pos;\r
 929 \r
 930                                 if ((pos = arg.IndexOf (' ')) != -1 && pos != 0){\r
 931                                         ref_line = System.Int32.Parse (arg.Substring (0, pos));\r
 932                                         pos++;\r
 933                                         \r
 934                                         char [] quotes = { '\"' };\r
 935                                         \r
 936                                         ref_name = arg.Substring (pos);\r
 937                                         ref_name.TrimStart (quotes);\r
 938                                         ref_name.TrimEnd (quotes);\r
 939                                 } else {\r
 940                                         ref_line = System.Int32.Parse (arg);\r
 941                                 }\r
 942                         } catch {\r
 943                                 return false;\r
 944                         }\r
 945                         \r
 946                         return true;\r
 947                 }\r
 948 \r
 949                 //\r
 950                 // Handles #define and #undef\r
 951                 //\r
 952                 void PreProcessDefinition (bool is_define, string arg)\r
 953                 {\r
 954                         if (arg == "" || arg == "true" || arg == "false"){\r
 955                                 Report.Error(1001, Location, "Missing identifer to pre-processor directive");\r
 956                                 return;\r
 957                         }\r
 958 \r
 959                         if (is_define){\r
 960                                 if (defines == null)\r
 961                                         defines = new Hashtable ();\r
 962                                 defines [arg] = 1;\r
 963                         } else {\r
 964                                 if (defines == null)\r
 965                                         return;\r
 966                                 if (defines.Contains (arg))\r
 967                                         defines.Remove (arg);\r
 968                         }\r
 969                 }\r
 970 \r
 971                 bool eval_val (string s)\r
 972                 {\r
 973                         if (s == "true")\r
 974                                 return true;\r
 975                         if (s == "false")\r
 976                                 return false;\r
 977                         \r
 978                         if (defines == null)\r
 979                                 return false;\r
 980                         if (defines.Contains (s))\r
 981                                 return true;\r
 982 \r
 983                         return false;\r
 984                 }\r
 985 \r
 986                 bool pp_primary (ref string s)\r
 987                 {\r
 988                         s.Trim ();\r
 989                         int len = s.Length;\r
 990 \r
 991                         if (len > 0){\r
 992                                 char c = s [0];\r
 993                                 \r
 994                                 if (c == '('){\r
 995                                         s = s.Substring (1);\r
 996                                         bool val = pp_expr (ref s);\r
 997                                         if (s.Length > 0 && s [0] == ')')\r
 998                                                 return val;\r
 999                                         report1517 ();\r
1000                                         return false;\r
1001                                 }\r
1002                                 \r
1003                                 if (Char.IsLetter (c) || c == '_'){\r
1004                                         int j = 1;\r
1005 \r
1006                                         while (j < len){\r
1007                                                 c = s [j];\r
1008                                                 \r
1009                                                 if (Char.IsLetter (c) || Char.IsDigit (c) || c == '_'){\r
1010                                                         j++;\r
1011                                                         continue;\r
1012                                                 }\r
1013                                                 bool v = eval_val (s.Substring (0, j));\r
1014                                                 s = s.Substring (j);\r
1015                                                 return v;\r
1016                                         }\r
1017                                         bool vv = eval_val (s);\r
1018                                         s = "";\r
1019                                         return vv;\r
1020                                 }\r
1021                         }\r
1022                         report1517 ();\r
1023                         return false;\r
1024                 }\r
1025                 \r
1026                 bool pp_unary (ref string s)\r
1027                 {\r
1028                         s = s.Trim ();\r
1029                         int len = s.Length;\r
1030 \r
1031                         if (len > 0){\r
1032                                 if (s [0] == '!'){\r
1033                                         if (len > 1 && s [1] == '='){\r
1034                                                 report1517 ();\r
1035                                                 return false;\r
1036                                         }\r
1037                                         s = s.Substring (1);\r
1038                                         return ! pp_primary (ref s);\r
1039                                 } else\r
1040                                         return pp_primary (ref s);\r
1041                         } else {\r
1042                                 report1517 ();\r
1043                                 return false;\r
1044                         }\r
1045                 }\r
1046                 \r
1047                 bool pp_eq (ref string s)\r
1048                 {\r
1049                         bool va = pp_unary (ref s);\r
1050 \r
1051                         s = s.Trim ();\r
1052                         int len = s.Length;\r
1053                         if (len > 0){\r
1054                                 if (s [0] == '='){\r
1055                                         if (len > 2 && s [1] == '='){\r
1056                                                 s = s.Substring (2);\r
1057                                                 return va == pp_unary (ref s);\r
1058                                         } else {\r
1059                                                 report1517 ();\r
1060                                                 return false;\r
1061                                         }\r
1062                                 } else if (s [0] == '!' && len > 1 && s [1] == '='){\r
1063                                         s = s.Substring (2);\r
1064 \r
1065                                         return va != pp_unary (ref s);\r
1066 \r
1067                                 }\r
1068                         }\r
1069 \r
1070                         return va;\r
1071                                 \r
1072                 }\r
1073                 \r
1074                 bool pp_and (ref string s)\r
1075                 {\r
1076                         bool va = pp_eq (ref s);\r
1077 \r
1078                         s = s.Trim ();\r
1079                         int len = s.Length;\r
1080                         if (len > 0){\r
1081                                 if (s [0] == '&'){\r
1082                                         if (len > 2 && s [1] == '&'){\r
1083                                                 s = s.Substring (2);\r
1084                                                 return va && pp_eq (ref s);\r
1085                                         } else {\r
1086                                                 report1517 ();\r
1087                                                 return false;\r
1088                                         }\r
1089                                 } \r
1090                         }\r
1091                         return va;\r
1092                 }\r
1093                 \r
1094                 //\r
1095                 // Evaluates an expression for `#if' or `#elif'\r
1096                 //\r
1097                 bool pp_expr (ref string s)\r
1098                 {\r
1099                         bool va = pp_and (ref s);\r
1100 \r
1101                         s = s.Trim ();\r
1102                         int len = s.Length;\r
1103                         if (len > 0){\r
1104                                 if (s [0] == '|'){\r
1105                                         if (len > 2 && s [1] == '|'){\r
1106                                                 s = s.Substring (2);\r
1107                                                 return va || pp_and (ref s);\r
1108                                         } else {\r
1109                                                 report1517 ();\r
1110                                                 return false;\r
1111                                         }\r
1112                                 } else {\r
1113                                         report1517 ();\r
1114                                         return false;\r
1115                                 }\r
1116                         }\r
1117 \r
1118                         return va;\r
1119                 }\r
1120 \r
1121                 bool eval (string s)\r
1122                 {\r
1123                         bool v = pp_expr (ref s);\r
1124 \r
1125                         return v;\r
1126                 }\r
1127                 \r
1128                 void report1517 ()\r
1129                 {\r
1130                         Report.Error (1517, Location, "Invalid pre-processor directive");\r
1131                 }\r
1132 \r
1133                 void report1028 (string extra)\r
1134                 {\r
1135                         Report.Error (\r
1136                                 1028, Location,\r
1137                                 "Unexpected processor directive (" + extra + ")");\r
1138                 }\r
1139                 \r
1140                 //\r
1141                 // if true, then the code continues processing the code\r
1142                 // if false, the code stays in a loop until another directive is\r
1143                 // reached.\r
1144                 //\r
1145                 bool handle_preprocessing_directive ()\r
1146                 {\r
1147                         char [] blank = { ' ', '\t' };\r
1148                         string cmd, arg;\r
1149                         \r
1150                         get_cmd_arg (out cmd, out arg);\r
1151                         \r
1152                         switch (cmd){\r
1153                         case "line":\r
1154                                 if (!PreProcessLine (arg))\r
1155                                         Report.Error (\r
1156                                                 1576, Location,\r
1157                                                 "Argument to #line directive is missing or invalid");\r
1158                                 return true;\r
1159 \r
1160                         case "define":\r
1161                                 PreProcessDefinition (true, arg);\r
1162                                 return true;\r
1163 \r
1164                         case "undef":\r
1165                                 PreProcessDefinition (false, arg);\r
1166                                 return true;\r
1167 \r
1168                         case "error":\r
1169                                 Report.Error (1029, Location, "#error: '" + arg + "'");\r
1170                                 return true;\r
1171 \r
1172                         case "warning":\r
1173                                 Report.Warning (1030, Location, "#warning: '" + arg + "'");\r
1174                                 return true;\r
1175 \r
1176                         case "region":\r
1177                                 arg = "true";\r
1178                                 goto case "if";\r
1179 \r
1180                         case "endregion":\r
1181                                 goto case "endif";\r
1182                                 \r
1183                         case "if":\r
1184                                 if (arg == ""){\r
1185                                         report1517 ();\r
1186                                         return true;\r
1187                                 }\r
1188                                 bool taking = false;\r
1189                                 if (ifstack == null)\r
1190                                         ifstack = new Stack ();\r
1191 \r
1192                                 if (ifstack.Count == 0){\r
1193                                         taking = true;\r
1194                                 } else {\r
1195                                         int state = (int) ifstack.Peek ();\r
1196                                         if ((state & TAKING) != 0)\r
1197                                                 taking = true;\r
1198                                 }\r
1199                                         \r
1200                                 if (eval (arg) && taking){\r
1201                                         ifstack.Push (TAKING | TAKEN_BEFORE | PARENT_TAKING);\r
1202                                         return true;\r
1203                                 } else {\r
1204                                         ifstack.Push (taking ? PARENT_TAKING : 0);\r
1205                                         return false;\r
1206                                 }\r
1207                                 \r
1208                         case "endif":\r
1209                                 if (ifstack == null || ifstack.Count == 0){\r
1210                                         report1028 ("no #if for this #endif");\r
1211                                         return true;\r
1212                                 } else {\r
1213                                         ifstack.Pop ();\r
1214                                         if (ifstack.Count == 0)\r
1215                                                 return true;\r
1216                                         else {\r
1217                                                 int state = (int) ifstack.Peek ();\r
1218 \r
1219                                                 if ((state & TAKING) != 0)\r
1220                                                         return true;\r
1221                                                 else\r
1222                                                         return false;\r
1223                                         }\r
1224                                 }\r
1225 \r
1226                         case "elif":\r
1227                                 if (ifstack == null || ifstack.Count == 0){\r
1228                                         report1028 ("no #if for this #elif");\r
1229                                         return true;\r
1230                                 } else {\r
1231                                         int state = (int) ifstack.Peek ();\r
1232 \r
1233                                         if ((state & ELSE_SEEN) != 0){\r
1234                                                 report1028 ("#elif not valid after #else");\r
1235                                                 return true;\r
1236                                         }\r
1237 \r
1238                                         if ((state & (TAKEN_BEFORE | TAKING)) != 0)\r
1239                                                 return false;\r
1240 \r
1241                                         if (eval (arg) && ((state & PARENT_TAKING) != 0)){\r
1242                                                 state = (int) ifstack.Pop ();\r
1243                                                 ifstack.Push (state | TAKING | TAKEN_BEFORE);\r
1244                                                 return true;\r
1245                                         } else \r
1246                                                 return false;\r
1247                                 }\r
1248 \r
1249                         case "else":\r
1250                                 if (ifstack == null || ifstack.Count == 0){\r
1251                                         Report.Error (\r
1252                                                 1028, Location,\r
1253                                                 "Unexpected processor directive (no #if for this #else)");\r
1254                                         return true;\r
1255                                 } else {\r
1256                                         int state = (int) ifstack.Peek ();\r
1257 \r
1258                                         if ((state & ELSE_SEEN) != 0){\r
1259                                                 report1028 ("#else within #else");\r
1260                                                 return true;\r
1261                                         }\r
1262 \r
1263                                         ifstack.Pop ();\r
1264                                         ifstack.Push (state | ELSE_SEEN);\r
1265 \r
1266                                         if ((state & TAKEN_BEFORE) == 0){\r
1267                                                 if ((state & PARENT_TAKING) != 0)\r
1268                                                         return true;\r
1269                                                 else\r
1270                                                         return false;\r
1271                                         }\r
1272                                         return false;\r
1273                                 }\r
1274                         }\r
1275                         \r
1276                         Report.Error (1024, Location, "Preprocessor directive expected (got: " + cmd + ")");\r
1277                         return true;\r
1278                 }\r
1279                 \r
1280                 public int xtoken ()\r
1281                 {\r
1282                         int t;\r
1283                         bool allow_keyword_as_ident = false;\r
1284                         bool doread = false;\r
1285                         int c;\r
1286 \r
1287                         val = null;\r
1288                         // optimization: eliminate col and implement #directive semantic correctly.\r
1289                         for (;(c = getChar ()) != -1; col++) {\r
1290                                 if (Char.IsLetter ((char)c) || c == '_'){\r
1291                                         System.Text.StringBuilder id = new System.Text.StringBuilder ();\r
1292                                         string ids;\r
1293 \r
1294                                         tokens_seen = true;\r
1295                                         id.Append ((char) c);\r
1296                                         \r
1297                                         while ((c = peekChar ()) != -1) {\r
1298                                                 if (is_identifier_part_character ((char) c)){\r
1299                                                         id.Append ((char)getChar ());\r
1300                                                         col++;\r
1301                                                 } else \r
1302                                                         break;\r
1303                                         }\r
1304                                         \r
1305                                         ids = id.ToString ();\r
1306 \r
1307                                         if (!is_keyword (ids) || allow_keyword_as_ident) {\r
1308                                                 val = ids;\r
1309                                                 if (ids.Length > 512){\r
1310                                                         Report.Error (\r
1311                                                                 645, Location,\r
1312                                                                 "Identifier too long (limit is 512 chars)");\r
1313                                                 }\r
1314                                                 allow_keyword_as_ident = false;\r
1315                                                 return Token.IDENTIFIER;\r
1316                                         }\r
1317 \r
1318                                         // true, false and null are in the hash anyway.\r
1319                                         return GetKeyword (ids);\r
1320 \r
1321                                 }\r
1322 \r
1323                                 if (c == '.'){\r
1324                                         tokens_seen = true;\r
1325                                         if (Char.IsDigit ((char) peekChar ()))\r
1326                                                 return is_number (c);\r
1327                                         return Token.DOT;\r
1328                                 }\r
1329                                 \r
1330                                 if (Char.IsDigit ((char) c)){\r
1331                                         tokens_seen = true;\r
1332                                         return is_number (c);\r
1333                                 }\r
1334 \r
1335                                 // Handle double-slash comments.\r
1336                                 if (c == '/'){\r
1337                                         int d = peekChar ();\r
1338                                 \r
1339                                         if (d == '/'){\r
1340                                                 getChar ();\r
1341                                                 while ((d = getChar ()) != -1 && (d != '\n'))\r
1342                                                         col++;\r
1343                                                 line++;\r
1344                                                 ref_line++;\r
1345                                                 col = 0;\r
1346                                                 continue;\r
1347                                         } else if (d == '*'){\r
1348                                                 getChar ();\r
1349 \r
1350                                                 while ((d = getChar ()) != -1){\r
1351                                                         if (d == '*' && peekChar () == '/'){\r
1352                                                                 getChar ();\r
1353                                                                 col++;\r
1354                                                                 break;\r
1355                                                         }\r
1356                                                         if (d == '\n'){\r
1357                                                                 line++;\r
1358                                                                 ref_line++;\r
1359                                                                 col = 0;\r
1360                                                         }\r
1361                                                 }\r
1362                                                 continue;\r
1363                                         }\r
1364                                 }\r
1365 \r
1366                                 /* For now, ignore pre-processor commands */\r
1367                                 // FIXME: In C# the '#' is not limited to appear\r
1368                                 // on the first column.\r
1369                                 if (c == '#' && !tokens_seen){\r
1370                                 start_again:\r
1371                                         \r
1372                                         bool cont = handle_preprocessing_directive ();\r
1373 \r
1374                                         if (cont){\r
1375                                                 col = 0;\r
1376                                                 continue;\r
1377                                         }\r
1378                                         col = 1;\r
1379 \r
1380                                         bool skipping = false;\r
1381                                         for (;(c = getChar ()) != -1; col++){\r
1382                                                 if (c == '\n'){\r
1383                                                         col = 0;\r
1384                                                         line++;\r
1385                                                         ref_line++;\r
1386                                                         skipping = false;\r
1387                                                 } else if (c == ' ' || c == '\t' || c == '\v' || c == '\r')\r
1388                                                         continue;\r
1389                                                 else if (c != '#')\r
1390                                                         skipping = true;\r
1391                                                 if (c == '#' && !skipping)\r
1392                                                         goto start_again;\r
1393                                         }\r
1394                                         tokens_seen = false;\r
1395                                         if (c == -1)\r
1396                                                 Report.Error (1027, Location, "#endif expected");\r
1397                                         continue;\r
1398                                 }\r
1399                                 \r
1400                                 if ((t = is_punct ((char)c, ref doread)) != Token.ERROR){\r
1401                                         tokens_seen = true;\r
1402                                         if (doread){\r
1403                                                 getChar ();\r
1404                                                 col++;\r
1405                                         }\r
1406                                         return t;\r
1407                                 }\r
1408                                 \r
1409                                 if (c == '"'){\r
1410                                         System.Text.StringBuilder s = new System.Text.StringBuilder ();\r
1411                                         tokens_seen = true;\r
1412                                         \r
1413                                         while ((c = getChar ()) != -1){\r
1414                                                 if (c == '"'){\r
1415                                                         if (allow_keyword_as_ident && peekChar () == '"'){\r
1416                                                                 s.Append ((char) c);\r
1417                                                                 getChar ();\r
1418                                                                 continue;\r
1419                                                         } \r
1420                                                         allow_keyword_as_ident = false;\r
1421                                                         val = s.ToString ();\r
1422                                                         return Token.LITERAL_STRING;\r
1423                                                 }\r
1424 \r
1425                                                 if (!allow_keyword_as_ident){\r
1426                                                         c = escape (c);\r
1427                                                         if (c == -1)\r
1428                                                                 return Token.ERROR;\r
1429                                                 }\r
1430                                                 s.Append ((char) c);\r
1431                                         }\r
1432                                 }\r
1433 \r
1434                                 if (c == '\''){\r
1435                                         c = getChar ();\r
1436                                         tokens_seen = true;\r
1437                                         if (c == '\''){\r
1438                                                 error_details = "Empty character literal";\r
1439                                                 Report.Error (1011, Location, error_details);\r
1440                                                 return Token.ERROR;\r
1441                                         }\r
1442                                         c = escape (c);\r
1443                                         if (c == -1)\r
1444                                                 return Token.ERROR;\r
1445                                         val = new System.Char ();\r
1446                                         val = (char) c;\r
1447                                         c = getChar ();\r
1448 \r
1449                                         if (c != '\''){\r
1450                                                 error_details = "Too many characters in character literal";\r
1451                                                 Report.Error (1012, Location, error_details);\r
1452 \r
1453                                                 // Try to recover, read until newline or next "'"\r
1454                                                 while ((c = getChar ()) != -1){\r
1455                                                         if (c == '\n' || c == '\'')\r
1456                                                                 break;\r
1457                                                         \r
1458                                                 }\r
1459                                                 return Token.ERROR;\r
1460                                         }\r
1461                                         return Token.LITERAL_CHARACTER;\r
1462                                 }\r
1463                                 \r
1464                                 // white space\r
1465                                 if (c == '\n'){\r
1466                                         line++;\r
1467                                         ref_line++;\r
1468                                         col = 0;\r
1469                                         tokens_seen = false;\r
1470                                         continue;\r
1471                                 }\r
1472 \r
1473                                 if (c == ' ' || c == '\t' || c == '\f' || c == '\v' || c == '\r'){\r
1474                                         if (c == '\t')\r
1475                                                 col = (((col + 8) / 8) * 8) - 1;\r
1476                                         continue;\r
1477                                 }\r
1478 \r
1479                                 if (c == '@'){\r
1480                                         tokens_seen = true;\r
1481                                         allow_keyword_as_ident = true;\r
1482                                         continue;\r
1483                                 }\r
1484 \r
1485                                 error_details = ((char)c).ToString ();\r
1486                                 \r
1487                                 return Token.ERROR;\r
1488                         }\r
1489 \r
1490                         if (ifstack != null && ifstack.Count > 1)\r
1491                                 Report.Error (1027, Location, "#endif expected");\r
1492                         return Token.EOF;\r
1493                 }\r
1494         }\r
1495 }\r
1496 \r