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, 2002 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 using System.Reflection;\r
  24 \r
  25 namespace Mono.CSharp\r
  26 {\r
  27         /// <summary>\r
  28         ///    Tokenizer for C# source code. \r
  29         /// </summary>\r
  30 \r
  31         public class Tokenizer : yyParser.yyInput\r
  32         {\r
  33                 StreamReader reader;\r
  34                 public SourceFile ref_name;\r
  35                 public SourceFile file_name;\r
  36                 public int ref_line = 1;\r
  37                 public int line = 1;\r
  38                 public int col = 1;\r
  39                 public int current_token;\r
  40                 bool handle_get_set = false;\r
  41                 bool handle_remove_add = false;\r
  42                 bool handle_assembly = false;\r
  43 \r
  44                 //\r
  45                 // Whether tokens have been seen on this line\r
  46                 //\r
  47                 bool tokens_seen = false;\r
  48 \r
  49                 //\r
  50                 // Whether a token has been seen on the file\r
  51                 // This is needed because `define' is not allowed to be used\r
  52                 // after a token has been seen.\r
  53                 //\r
  54                 bool any_token_seen = false;\r
  55                 static Hashtable tokenValues;\r
  56                 \r
  57                 private static Hashtable TokenValueName\r
  58                 {\r
  59                         get {\r
  60                                 if (tokenValues == null)\r
  61                                         tokenValues = GetTokenValueNameHash ();\r
  62 \r
  63                                 return tokenValues;\r
  64                         }\r
  65                 }\r
  66 \r
  67                 private static Hashtable GetTokenValueNameHash ()\r
  68                 {\r
  69                         Type t = typeof (Token);\r
  70                         FieldInfo [] fields = t.GetFields ();\r
  71                         Hashtable hash = new Hashtable ();\r
  72                         foreach (FieldInfo field in fields) {\r
  73                                 if (field.IsLiteral && field.IsStatic && field.FieldType == typeof (int))\r
  74                                         hash.Add (field.GetValue (null), field.Name);\r
  75                         }\r
  76                         return hash;\r
  77                 }\r
  78                 \r
  79                 //\r
  80                 // Returns a verbose representation of the current location\r
  81                 //\r
  82                 public string location {\r
  83                         get {\r
  84                                 string det;\r
  85 \r
  86                                 if (current_token == Token.ERROR)\r
  87                                         det = "detail: " + error_details;\r
  88                                 else\r
  89                                         det = "";\r
  90                                 \r
  91                                 // return "Line:     "+line+" Col: "+col + "\n" +\r
  92                                 //       "VirtLine: "+ref_line +\r
  93                                 //       " Token: "+current_token + " " + det;\r
  94                                 string current_token_name = TokenValueName [current_token] as string;\r
  95                                 if (current_token_name == null)\r
  96                                         current_token_name = current_token.ToString ();\r
  97 \r
  98                                 return String.Format ("{0} ({1},{2}), Token: {3} {4}", ref_name.Name,\r
  99                                                                                        ref_line,\r
 100                                                                                        col,\r
 101                                                                                        current_token_name,\r
 102                                                                                        det);\r
 103                         }\r
 104                 }\r
 105 \r
 106                 public bool PropertyParsing {\r
 107                         get {\r
 108                                 return handle_get_set;\r
 109                         }\r
 110 \r
 111                         set {\r
 112                                 handle_get_set = value;\r
 113                         }\r
 114                 }\r
 115 \r
 116                 public bool AssemblyTargetParsing {\r
 117                         get {\r
 118                                 return handle_assembly;\r
 119                         }\r
 120 \r
 121                         set {\r
 122                                 handle_assembly = value;\r
 123                         }\r
 124                 }\r
 125 \r
 126                 public bool EventParsing {\r
 127                         get {\r
 128                                 return handle_remove_add;\r
 129                         }\r
 130 \r
 131                         set {\r
 132                                 handle_remove_add = value;\r
 133                         }\r
 134                 }\r
 135                 \r
 136                 //\r
 137                 // Class variables\r
 138                 // \r
 139                 static Hashtable keywords;\r
 140                 static NumberStyles styles;\r
 141                 static NumberFormatInfo csharp_format_info;\r
 142                 \r
 143                 //\r
 144                 // Values for the associated token returned\r
 145                 //\r
 146                 int putback_char;\r
 147                 Object val;\r
 148 \r
 149                 //\r
 150                 // Pre-processor\r
 151                 //\r
 152                 Hashtable defines;\r
 153 \r
 154                 const int TAKING        = 1;\r
 155                 const int TAKEN_BEFORE  = 2;\r
 156                 const int ELSE_SEEN     = 4;\r
 157                 const int PARENT_TAKING = 8;\r
 158                 const int REGION        = 16;           \r
 159 \r
 160                 //\r
 161                 // pre-processor if stack state:\r
 162                 //\r
 163                 Stack ifstack;\r
 164 \r
 165                 static System.Text.StringBuilder string_builder;\r
 166 \r
 167                 const int max_id_size = 512;\r
 168                 static char [] id_builder = new char [max_id_size];\r
 169 \r
 170                 const int max_number_size = 128;\r
 171                 static char [] number_builder = new char [max_number_size];\r
 172                 static int number_pos;\r
 173                 \r
 174                 //\r
 175                 // Details about the error encoutered by the tokenizer\r
 176                 //\r
 177                 string error_details;\r
 178                 \r
 179                 public string error {\r
 180                         get {\r
 181                                 return error_details;\r
 182                         }\r
 183                 }\r
 184                 \r
 185                 public int Line {\r
 186                         get {\r
 187                                 return ref_line;\r
 188                         }\r
 189                 }\r
 190 \r
 191                 public int Col {\r
 192                         get {\r
 193                                 return col;\r
 194                         }\r
 195                 }\r
 196 \r
 197                 static void InitTokens ()\r
 198                 {\r
 199                         keywords = new Hashtable ();\r
 200 \r
 201                         keywords.Add ("abstract", Token.ABSTRACT);\r
 202                         keywords.Add ("as", Token.AS);\r
 203                         keywords.Add ("add", Token.ADD);\r
 204                         keywords.Add ("assembly", Token.ASSEMBLY);\r
 205                         keywords.Add ("base", Token.BASE);\r
 206                         keywords.Add ("bool", Token.BOOL);\r
 207                         keywords.Add ("break", Token.BREAK);\r
 208                         keywords.Add ("byte", Token.BYTE);\r
 209                         keywords.Add ("case", Token.CASE);\r
 210                         keywords.Add ("catch", Token.CATCH);\r
 211                         keywords.Add ("char", Token.CHAR);\r
 212                         keywords.Add ("checked", Token.CHECKED);\r
 213                         keywords.Add ("class", Token.CLASS);\r
 214                         keywords.Add ("const", Token.CONST);\r
 215                         keywords.Add ("continue", Token.CONTINUE);\r
 216                         keywords.Add ("decimal", Token.DECIMAL);\r
 217                         keywords.Add ("default", Token.DEFAULT);\r
 218                         keywords.Add ("delegate", Token.DELEGATE);\r
 219                         keywords.Add ("do", Token.DO);\r
 220                         keywords.Add ("double", Token.DOUBLE);\r
 221                         keywords.Add ("else", Token.ELSE);\r
 222                         keywords.Add ("enum", Token.ENUM);\r
 223                         keywords.Add ("event", Token.EVENT);\r
 224                         keywords.Add ("explicit", Token.EXPLICIT);\r
 225                         keywords.Add ("extern", Token.EXTERN);\r
 226                         keywords.Add ("false", Token.FALSE);\r
 227                         keywords.Add ("finally", Token.FINALLY);\r
 228                         keywords.Add ("fixed", Token.FIXED);\r
 229                         keywords.Add ("float", Token.FLOAT);\r
 230                         keywords.Add ("for", Token.FOR);\r
 231                         keywords.Add ("foreach", Token.FOREACH);\r
 232                         keywords.Add ("goto", Token.GOTO);\r
 233                         keywords.Add ("get", Token.GET);\r
 234                         keywords.Add ("if", Token.IF);\r
 235                         keywords.Add ("implicit", Token.IMPLICIT);\r
 236                         keywords.Add ("in", Token.IN);\r
 237                         keywords.Add ("int", Token.INT);\r
 238                         keywords.Add ("interface", Token.INTERFACE);\r
 239                         keywords.Add ("internal", Token.INTERNAL);\r
 240                         keywords.Add ("is", Token.IS);\r
 241                         keywords.Add ("lock", Token.LOCK);\r
 242                         keywords.Add ("long", Token.LONG);\r
 243                         keywords.Add ("namespace", Token.NAMESPACE);\r
 244                         keywords.Add ("new", Token.NEW);\r
 245                         keywords.Add ("null", Token.NULL);\r
 246                         keywords.Add ("object", Token.OBJECT);\r
 247                         keywords.Add ("operator", Token.OPERATOR);\r
 248                         keywords.Add ("out", Token.OUT);\r
 249                         keywords.Add ("override", Token.OVERRIDE);\r
 250                         keywords.Add ("params", Token.PARAMS);\r
 251                         keywords.Add ("private", Token.PRIVATE);\r
 252                         keywords.Add ("protected", Token.PROTECTED);\r
 253                         keywords.Add ("public", Token.PUBLIC);\r
 254                         keywords.Add ("readonly", Token.READONLY);\r
 255                         keywords.Add ("ref", Token.REF);\r
 256                         keywords.Add ("remove", Token.REMOVE);\r
 257                         keywords.Add ("return", Token.RETURN);\r
 258                         keywords.Add ("sbyte", Token.SBYTE);\r
 259                         keywords.Add ("sealed", Token.SEALED);\r
 260                         keywords.Add ("set", Token.SET);\r
 261                         keywords.Add ("short", Token.SHORT);\r
 262                         keywords.Add ("sizeof", Token.SIZEOF);\r
 263                         keywords.Add ("stackalloc", Token.STACKALLOC);\r
 264                         keywords.Add ("static", Token.STATIC);\r
 265                         keywords.Add ("string", Token.STRING);\r
 266                         keywords.Add ("struct", Token.STRUCT);\r
 267                         keywords.Add ("switch", Token.SWITCH);\r
 268                         keywords.Add ("this", Token.THIS);\r
 269                         keywords.Add ("throw", Token.THROW);\r
 270                         keywords.Add ("true", Token.TRUE);\r
 271                         keywords.Add ("try", Token.TRY);\r
 272                         keywords.Add ("typeof", Token.TYPEOF);\r
 273                         keywords.Add ("uint", Token.UINT);\r
 274                         keywords.Add ("ulong", Token.ULONG);\r
 275                         keywords.Add ("unchecked", Token.UNCHECKED);\r
 276                         keywords.Add ("unsafe", Token.UNSAFE);\r
 277                         keywords.Add ("ushort", Token.USHORT);\r
 278                         keywords.Add ("using", Token.USING);\r
 279                         keywords.Add ("virtual", Token.VIRTUAL);\r
 280                         keywords.Add ("void", Token.VOID);\r
 281                         keywords.Add ("volatile", Token.VOLATILE);\r
 282                         keywords.Add ("while", Token.WHILE);\r
 283                 }\r
 284 \r
 285                 //\r
 286                 // Class initializer\r
 287                 // \r
 288                 static Tokenizer ()\r
 289                 {\r
 290                         InitTokens ();\r
 291                         csharp_format_info = NumberFormatInfo.InvariantInfo;\r
 292                         styles = NumberStyles.Float;\r
 293                         \r
 294                         string_builder = new System.Text.StringBuilder ();\r
 295                 }\r
 296 \r
 297                 int GetKeyword (string name)\r
 298                 {\r
 299                         object o = keywords [name];\r
 300 \r
 301                         if (o == null)\r
 302                                 return -1;\r
 303                         \r
 304                         int res = (int) o;\r
 305 \r
 306                         if (handle_get_set == false && (res == Token.GET || res == Token.SET))\r
 307                                 return -1;\r
 308                         if (handle_remove_add == false && (res == Token.REMOVE || res == Token.ADD))\r
 309                                 return -1;\r
 310                         if (handle_assembly == false && res == Token.ASSEMBLY)\r
 311                                 return -1;\r
 312                         return res;\r
 313                         \r
 314                 }\r
 315 \r
 316                 public Location Location {\r
 317                         get {\r
 318                                 return new Location (ref_line);\r
 319                         }\r
 320                 }\r
 321 \r
 322                 void define (string def)\r
 323                 {\r
 324                         if (!RootContext.AllDefines.Contains (def)){\r
 325                                 RootContext.AllDefines [def] = true;\r
 326                         }\r
 327                         if (defines.Contains (def))\r
 328                                 return;\r
 329                         defines [def] = true;\r
 330                 }\r
 331                 \r
 332                 public Tokenizer (StreamReader input, SourceFile file, ArrayList defs)\r
 333                 {\r
 334                         this.ref_name = file;\r
 335                         this.file_name = file;\r
 336                         reader = input;\r
 337                         \r
 338                         putback_char = -1;\r
 339 \r
 340                         if (defs != null){\r
 341                                 defines = new Hashtable ();\r
 342                                 foreach (string def in defs)\r
 343                                         define (def);\r
 344                         }\r
 345 \r
 346                         //\r
 347                         // FIXME: This could be `Location.Push' but we have to\r
 348                         // find out why the MS compiler allows this\r
 349                         //\r
 350                         Mono.CSharp.Location.Push (file);\r
 351                 }\r
 352 \r
 353                 bool is_identifier_start_character (char c)\r
 354                 {\r
 355                         return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || c == '_' || Char.IsLetter (c);\r
 356                 }\r
 357 \r
 358                 bool is_identifier_part_character (char c)\r
 359                 {\r
 360                         return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '_' || (c >= '0' && c <= '9') || Char.IsLetter (c);\r
 361                 }\r
 362 \r
 363                 int is_punct (char c, ref bool doread)\r
 364                 {\r
 365                         int d;\r
 366                         int t;\r
 367 \r
 368                         doread = false;\r
 369 \r
 370                         switch (c){\r
 371                         case '{':\r
 372                                 return Token.OPEN_BRACE;\r
 373                         case '}':\r
 374                                 return Token.CLOSE_BRACE;\r
 375                         case '[':\r
 376                                 return Token.OPEN_BRACKET;\r
 377                         case ']':\r
 378                                 return Token.CLOSE_BRACKET;\r
 379                         case '(':\r
 380                                 return Token.OPEN_PARENS;\r
 381                         case ')':\r
 382                                 return Token.CLOSE_PARENS;\r
 383                         case ',':\r
 384                                 return Token.COMMA;\r
 385                         case ':':\r
 386                                 return Token.COLON;\r
 387                         case ';':\r
 388                                 return Token.SEMICOLON;\r
 389                         case '~':\r
 390                                 return Token.TILDE;\r
 391                         case '?':\r
 392                                 return Token.INTERR;\r
 393                         }\r
 394 \r
 395                         d = peekChar ();\r
 396                         if (c == '+'){\r
 397                                 \r
 398                                 if (d == '+')\r
 399                                         t = Token.OP_INC;\r
 400                                 else if (d == '=')\r
 401                                         t = Token.OP_ADD_ASSIGN;\r
 402                                 else\r
 403                                         return Token.PLUS;\r
 404                                 doread = true;\r
 405                                 return t;\r
 406                         }\r
 407                         if (c == '-'){\r
 408                                 if (d == '-')\r
 409                                         t = Token.OP_DEC;\r
 410                                 else if (d == '=')\r
 411                                         t = Token.OP_SUB_ASSIGN;\r
 412                                 else if (d == '>')\r
 413                                         t = Token.OP_PTR;\r
 414                                 else\r
 415                                         return Token.MINUS;\r
 416                                 doread = true;\r
 417                                 return t;\r
 418                         }\r
 419 \r
 420                         if (c == '!'){\r
 421                                 if (d == '='){\r
 422                                         doread = true;\r
 423                                         return Token.OP_NE;\r
 424                                 }\r
 425                                 return Token.BANG;\r
 426                         }\r
 427 \r
 428                         if (c == '='){\r
 429                                 if (d == '='){\r
 430                                         doread = true;\r
 431                                         return Token.OP_EQ;\r
 432                                 }\r
 433                                 return Token.ASSIGN;\r
 434                         }\r
 435 \r
 436                         if (c == '&'){\r
 437                                 if (d == '&'){\r
 438                                         doread = true;\r
 439                                         return Token.OP_AND;\r
 440                                 } else if (d == '='){\r
 441                                         doread = true;\r
 442                                         return Token.OP_AND_ASSIGN;\r
 443                                 }\r
 444                                 return Token.BITWISE_AND;\r
 445                         }\r
 446 \r
 447                         if (c == '|'){\r
 448                                 if (d == '|'){\r
 449                                         doread = true;\r
 450                                         return Token.OP_OR;\r
 451                                 } else if (d == '='){\r
 452                                         doread = true;\r
 453                                         return Token.OP_OR_ASSIGN;\r
 454                                 }\r
 455                                 return Token.BITWISE_OR;\r
 456                         }\r
 457 \r
 458                         if (c == '*'){\r
 459                                 if (d == '='){\r
 460                                         doread = true;\r
 461                                         return Token.OP_MULT_ASSIGN;\r
 462                                 }\r
 463                                 return Token.STAR;\r
 464                         }\r
 465 \r
 466                         if (c == '/'){\r
 467                                 if (d == '='){\r
 468                                         doread = true;\r
 469                                         return Token.OP_DIV_ASSIGN;\r
 470                                 }\r
 471                                 return Token.DIV;\r
 472                         }\r
 473 \r
 474                         if (c == '%'){\r
 475                                 if (d == '='){\r
 476                                         doread = true;\r
 477                                         return Token.OP_MOD_ASSIGN;\r
 478                                 }\r
 479                                 return Token.PERCENT;\r
 480                         }\r
 481 \r
 482                         if (c == '^'){\r
 483                                 if (d == '='){\r
 484                                         doread = true;\r
 485                                         return Token.OP_XOR_ASSIGN;\r
 486                                 }\r
 487                                 return Token.CARRET;\r
 488                         }\r
 489 \r
 490                         if (c == '<'){\r
 491                                 if (d == '<'){\r
 492                                         getChar ();\r
 493                                         d = peekChar ();\r
 494 \r
 495                                         if (d == '='){\r
 496                                                 doread = true;\r
 497                                                 return Token.OP_SHIFT_LEFT_ASSIGN;\r
 498                                         }\r
 499                                         return Token.OP_SHIFT_LEFT;\r
 500                                 } else if (d == '='){\r
 501                                         doread = true;\r
 502                                         return Token.OP_LE;\r
 503                                 }\r
 504                                 return Token.OP_LT;\r
 505                         }\r
 506 \r
 507                         if (c == '>'){\r
 508                                 if (d == '>'){\r
 509                                         getChar ();\r
 510                                         d = peekChar ();\r
 511 \r
 512                                         if (d == '='){\r
 513                                                 doread = true;\r
 514                                                 return Token.OP_SHIFT_RIGHT_ASSIGN;\r
 515                                         }\r
 516                                         return Token.OP_SHIFT_RIGHT;\r
 517                                 } else if (d == '='){\r
 518                                         doread = true;\r
 519                                         return Token.OP_GE;\r
 520                                 }\r
 521                                 return Token.OP_GT;\r
 522                         }\r
 523                         return Token.ERROR;\r
 524                 }\r
 525 \r
 526                 void Error_NumericConstantTooLong ()\r
 527                 {\r
 528                         Report.Error (1021, Location, "Numeric constant too long");                     \r
 529                 }\r
 530                 \r
 531                 bool decimal_digits (int c)\r
 532                 {\r
 533                         int d;\r
 534                         bool seen_digits = false;\r
 535                         \r
 536                         if (c != -1){\r
 537                                 if (number_pos == max_number_size)\r
 538                                         Error_NumericConstantTooLong ();\r
 539                                 number_builder [number_pos++] = (char) c;\r
 540                         }\r
 541                         \r
 542                         //\r
 543                         // We use peekChar2, because decimal_digits needs to do a \r
 544                         // 2-character look-ahead (5.ToString for example).\r
 545                         //\r
 546                         while ((d = peekChar2 ()) != -1){\r
 547                                 if (d >= '0' && d <= '9'){\r
 548                                         if (number_pos == max_number_size)\r
 549                                                 Error_NumericConstantTooLong ();\r
 550                                         number_builder [number_pos++] = (char) d;\r
 551                                         getChar ();\r
 552                                         seen_digits = true;\r
 553                                 } else\r
 554                                         break;\r
 555                         }\r
 556                         \r
 557                         return seen_digits;\r
 558                 }\r
 559 \r
 560                 bool is_hex (int e)\r
 561                 {\r
 562                         return (e >= '0' && e <= '9') || (e >= 'A' && e <= 'F') || (e >= 'a' && e <= 'f');\r
 563                 }\r
 564                 \r
 565                 void hex_digits (int c)\r
 566                 {\r
 567                         if (c != -1)\r
 568                                 number_builder [number_pos++] = (char) c;\r
 569                         \r
 570                 }\r
 571                 \r
 572                 int real_type_suffix (int c)\r
 573                 {\r
 574                         int t;\r
 575 \r
 576                         switch (c){\r
 577                         case 'F': case 'f':\r
 578                                 t =  Token.LITERAL_FLOAT;\r
 579                                 break;\r
 580                         case 'D': case 'd':\r
 581                                 t = Token.LITERAL_DOUBLE;\r
 582                                 break;\r
 583                         case 'M': case 'm':\r
 584                                  t= Token.LITERAL_DECIMAL;\r
 585                                 break;\r
 586                         default:\r
 587                                 return Token.NONE;\r
 588                         }\r
 589                         return t;\r
 590                 }\r
 591 \r
 592                 int integer_type_suffix (ulong ul, int c)\r
 593                 {\r
 594                         bool is_unsigned = false;\r
 595                         bool is_long = false;\r
 596 \r
 597                         if (c != -1){\r
 598                                 bool scanning = true;\r
 599                                 do {\r
 600                                         switch (c){\r
 601                                         case 'U': case 'u':\r
 602                                                 if (is_unsigned)\r
 603                                                         scanning = false;\r
 604                                                 is_unsigned = true;\r
 605                                                 getChar ();\r
 606                                                 break;\r
 607 \r
 608                                         case 'l':\r
 609                                                 if (!is_unsigned){\r
 610                                                         //\r
 611                                                         // if we have not seen anything in between\r
 612                                                         // report this error\r
 613                                                         //\r
 614                                                         Report.Warning (\r
 615                                                                 78, Location,\r
 616                                                         "the 'l' suffix is easily confused with digit `1'," +\r
 617                                                         " use 'L' for clarity");\r
 618                                                 }\r
 619                                                 goto case 'L';\r
 620                                                 \r
 621                                         case 'L': \r
 622                                                 if (is_long)\r
 623                                                         scanning = false;\r
 624                                                 is_long = true;\r
 625                                                 getChar ();\r
 626                                                 break;\r
 627                                                 \r
 628                                         default:\r
 629                                                 scanning = false;\r
 630                                                 break;\r
 631                                         }\r
 632                                         c = peekChar ();\r
 633                                 } while (scanning);\r
 634                         }\r
 635 \r
 636                         if (is_long && is_unsigned){\r
 637                                 val = ul;\r
 638                                 return Token.LITERAL_INTEGER;\r
 639                         } else if (is_unsigned){\r
 640                                 // uint if possible, or ulong else.\r
 641 \r
 642                                 if ((ul & 0xffffffff00000000) == 0)\r
 643                                         val = (uint) ul;\r
 644                                 else\r
 645                                         val = ul;\r
 646                         } else if (is_long){\r
 647                                 // long if possible, ulong otherwise\r
 648                                 if ((ul & 0x8000000000000000) != 0)\r
 649                                         val = ul;\r
 650                                 else\r
 651                                         val = (long) ul;\r
 652                         } else {\r
 653                                 // int, uint, long or ulong in that order\r
 654                                 if ((ul & 0xffffffff00000000) == 0){\r
 655                                         uint ui = (uint) ul;\r
 656                                         \r
 657                                         if ((ui & 0x80000000) != 0)\r
 658                                                 val = ui;\r
 659                                         else\r
 660                                                 val = (int) ui;\r
 661                                 } else {\r
 662                                         if ((ul & 0x8000000000000000) != 0)\r
 663                                                 val = ul;\r
 664                                         else\r
 665                                                 val = (long) ul;\r
 666                                 }\r
 667                         }\r
 668                         return Token.LITERAL_INTEGER;\r
 669                 }\r
 670                                 \r
 671                 //\r
 672                 // given `c' as the next char in the input decide whether\r
 673                 // we need to convert to a special type, and then choose\r
 674                 // the best representation for the integer\r
 675                 //\r
 676                 int adjust_int (int c)\r
 677                 {\r
 678                         try {\r
 679                                 if (number_pos > 9){\r
 680                                         ulong ul = (uint) (number_builder [0] - '0');\r
 681 \r
 682                                         for (int i = 1; i < number_pos; i++){\r
 683                                                 ul = checked ((ul * 10) + ((uint)(number_builder [i] - '0')));\r
 684                                         }\r
 685                                         return integer_type_suffix (ul, c);\r
 686                                 } else {\r
 687                                         uint ui = (uint) (number_builder [0] - '0');\r
 688 \r
 689                                         for (int i = 1; i < number_pos; i++){\r
 690                                                 ui = checked ((ui * 10) + ((uint)(number_builder [i] - '0')));\r
 691                                         }\r
 692                                         return integer_type_suffix (ui, c);\r
 693                                 }\r
 694                         } catch (OverflowException) {\r
 695                                 error_details = "Integral constant is too large";\r
 696                                 Report.Error (1021, Location, error_details);\r
 697                                 val = 0ul;\r
 698                                 return Token.LITERAL_INTEGER;\r
 699                         }\r
 700                 }\r
 701                 \r
 702                 int adjust_real (int t)\r
 703                 {\r
 704                         string s = new String (number_builder, 0, number_pos);\r
 705 \r
 706                         switch (t){\r
 707                         case Token.LITERAL_DECIMAL:\r
 708                                 try {\r
 709                                         val = System.Decimal.Parse (s, styles, csharp_format_info);\r
 710                                 } catch (OverflowException) {\r
 711                                         val = 0m;     \r
 712                                         error_details = "Floating-point constant is outside the range of the type 'decimal'";\r
 713                                         Report.Error (594, Location, error_details);\r
 714                                 }\r
 715                                 break;\r
 716                         case Token.LITERAL_FLOAT:\r
 717                                 try {\r
 718                                         val = (float) System.Double.Parse (s, styles, csharp_format_info);\r
 719                                 } catch (OverflowException) {\r
 720                                         val = 0.0f;     \r
 721                                         error_details = "Floating-point constant is outside the range of the type 'float'";\r
 722                                         Report.Error (594, Location, error_details);\r
 723                                 }\r
 724                                 break;\r
 725                                 \r
 726                         case Token.LITERAL_DOUBLE:\r
 727                         case Token.NONE:\r
 728                                 t = Token.LITERAL_DOUBLE;\r
 729                                 try {\r
 730                                         val = System.Double.Parse (s, styles, csharp_format_info);\r
 731                                 } catch (OverflowException) {\r
 732                                         val = 0.0;     \r
 733                                         error_details = "Floating-point constant is outside the range of the type 'double'";\r
 734                                         Report.Error (594, Location, error_details);\r
 735                                 }\r
 736                                 break;\r
 737                         }\r
 738                         return t;\r
 739                 }\r
 740 \r
 741                 int handle_hex ()\r
 742                 {\r
 743                         int d;\r
 744                         ulong ul;\r
 745                         \r
 746                         getChar ();\r
 747                         while ((d = peekChar ()) != -1){\r
 748                                 if (is_hex (d)){\r
 749                                         if (number_pos == 16){\r
 750                                                 Report.Error (1021, Location, "Integral constant too large");\r
 751                                                 return Token.ERROR;\r
 752                                         }\r
 753                                         number_builder [number_pos++] = (char) d;\r
 754                                         getChar ();\r
 755                                 } else\r
 756                                         break;\r
 757                         }\r
 758                         \r
 759                         string s = new String (number_builder, 0, number_pos);\r
 760                         if (number_pos <= 8)\r
 761                                 ul = System.UInt32.Parse (s, NumberStyles.HexNumber);\r
 762                         else\r
 763                                 ul = System.UInt64.Parse (s, NumberStyles.HexNumber);\r
 764                         return integer_type_suffix (ul, peekChar ());\r
 765                 }\r
 766 \r
 767                 //\r
 768                 // Invoked if we know we have .digits or digits\r
 769                 //\r
 770                 int is_number (int c)\r
 771                 {\r
 772                         bool is_real = false;\r
 773                         int type;\r
 774 \r
 775                         number_pos = 0;\r
 776 \r
 777                         if (c >= '0' && c <= '9'){\r
 778                                 if (c == '0'){\r
 779                                         int peek = peekChar ();\r
 780 \r
 781                                         if (peek == 'x' || peek == 'X')\r
 782                                                 return handle_hex ();\r
 783                                 }\r
 784                                 decimal_digits (c);\r
 785                                 c = getChar ();\r
 786                         }\r
 787 \r
 788                         //\r
 789                         // We need to handle the case of\r
 790                         // "1.1" vs "1.string" (LITERAL_FLOAT vs NUMBER DOT IDENTIFIER)\r
 791                         //\r
 792                         if (c == '.'){\r
 793                                 if (decimal_digits ('.')){\r
 794                                         is_real = true;\r
 795                                         c = getChar ();\r
 796                                 } else {\r
 797                                         putback ('.');\r
 798                                         number_pos--;\r
 799                                         return adjust_int (-1);\r
 800                                 }\r
 801                         }\r
 802                         \r
 803                         if (c == 'e' || c == 'E'){\r
 804                                 is_real = true;\r
 805                                 if (number_pos == max_number_size)\r
 806                                         Error_NumericConstantTooLong ();\r
 807                                 number_builder [number_pos++] = 'e';\r
 808                                 c = getChar ();\r
 809                                 \r
 810                                 if (c == '+'){\r
 811                                         if (number_pos == max_number_size)\r
 812                                                 Error_NumericConstantTooLong ();\r
 813                                         number_builder [number_pos++] = '+';\r
 814                                         c = -1;\r
 815                                 } else if (c == '-') {\r
 816                                         if (number_pos == max_number_size)\r
 817                                                 Error_NumericConstantTooLong ();\r
 818                                         number_builder [number_pos++] = '-';\r
 819                                         c = -1;\r
 820                                 } else {\r
 821                                         if (number_pos == max_number_size)\r
 822                                                 Error_NumericConstantTooLong ();\r
 823                                         number_builder [number_pos++] = '+';\r
 824                                 }\r
 825                                         \r
 826                                 decimal_digits (c);\r
 827                                 c = getChar ();\r
 828                         }\r
 829 \r
 830                         type = real_type_suffix (c);\r
 831                         if (type == Token.NONE && !is_real){\r
 832                                 putback (c);\r
 833                                 return adjust_int (c);\r
 834                         } else \r
 835                                 is_real = true;\r
 836 \r
 837                         if (type == Token.NONE){\r
 838                                 putback (c);\r
 839                         }\r
 840                         \r
 841                         if (is_real)\r
 842                                 return adjust_real (type);\r
 843 \r
 844                         Console.WriteLine ("This should not be reached");\r
 845                         throw new Exception ("Is Number should never reach this point");\r
 846                 }\r
 847 \r
 848                 //\r
 849                 // Accepts exactly count (4 or 8) hex, no more no less\r
 850                 //\r
 851                 int getHex (int count, out bool error)\r
 852                 {\r
 853                         int [] buffer = new int [8];\r
 854                         int i;\r
 855                         int total = 0;\r
 856                         int c;\r
 857                         int top = count != -1 ? count : 4;\r
 858                         \r
 859                         getChar ();\r
 860                         error = false;\r
 861                         for (i = 0; i < top; i++){\r
 862                                 c = getChar ();\r
 863                                 \r
 864                                 if (c >= '0' && c <= '9')\r
 865                                         c = (int) c - (int) '0';\r
 866                                 else if (c >= 'A' && c <= 'F')\r
 867                                         c = (int) c - (int) 'A' + 10;\r
 868                                 else if (c >= 'a' && c <= 'f')\r
 869                                         c = (int) c - (int) 'a' + 10;\r
 870                                 else {\r
 871                                         error = true;\r
 872                                         return 0;\r
 873                                 }\r
 874                                 \r
 875                                 total = (total * 16) + c;\r
 876                                 if (count == -1){\r
 877                                         int p = peekChar ();\r
 878                                         if (p == -1)\r
 879                                                 break;\r
 880                                         if (!is_hex ((char)p))\r
 881                                                 break;\r
 882                                 }\r
 883                         }\r
 884                         return total;\r
 885                 }\r
 886 \r
 887                 int escape (int c)\r
 888                 {\r
 889                         bool error;\r
 890                         int d;\r
 891                         int v;\r
 892 \r
 893                         d = peekChar ();\r
 894                         if (c != '\\')\r
 895                                 return c;\r
 896                         \r
 897                         switch (d){\r
 898                         case 'a':\r
 899                                 v = '\a'; break;\r
 900                         case 'b':\r
 901                                 v = '\b'; break;\r
 902                         case 'n':\r
 903                                 v = '\n'; break;\r
 904                         case 't':\r
 905                                 v = '\t'; break;\r
 906                         case 'v':\r
 907                                 v = '\v'; break;\r
 908                         case 'r':\r
 909                                 v = '\r'; break;\r
 910                         case '\\':\r
 911                                 v = '\\'; break;\r
 912                         case 'f':\r
 913                                 v = '\f'; break;\r
 914                         case '0':\r
 915                                 v = 0; break;\r
 916                         case '"':\r
 917                                 v = '"'; break;\r
 918                         case '\'':\r
 919                                 v = '\''; break;\r
 920                         case 'x':\r
 921                                 v = getHex (-1, out error);\r
 922                                 if (error)\r
 923                                         goto default;\r
 924                                 return v;\r
 925                         case 'u':\r
 926                                 v = getHex (4, out error);\r
 927                                 if (error)\r
 928                                         goto default;\r
 929                                 return v;\r
 930                         case 'U':\r
 931                                 v = getHex (8, out error);\r
 932                                 if (error)\r
 933                                         goto default;\r
 934                                 return v;\r
 935                         default:\r
 936                                 Report.Error (1009, Location, "Unrecognized escape sequence in " + (char)d);\r
 937                                 return d;\r
 938                         }\r
 939                         getChar ();\r
 940                         return v;\r
 941                 }\r
 942 \r
 943                 int getChar ()\r
 944                 {\r
 945                         if (putback_char != -1){\r
 946                                 int x = putback_char;\r
 947                                 putback_char = -1;\r
 948 \r
 949                                 return x;\r
 950                         }\r
 951                         return reader.Read ();\r
 952                 }\r
 953 \r
 954                 int peekChar ()\r
 955                 {\r
 956                         if (putback_char != -1)\r
 957                                 return putback_char;\r
 958                         putback_char = reader.Read ();\r
 959                         return putback_char;\r
 960                 }\r
 961 \r
 962                 int peekChar2 ()\r
 963                 {\r
 964                         if (putback_char != -1)\r
 965                                 return putback_char;\r
 966                         return reader.Peek ();\r
 967                 }\r
 968                 \r
 969                 void putback (int c)\r
 970                 {\r
 971                         if (putback_char != -1){\r
 972                                 Console.WriteLine ("Col: " + col);\r
 973                                 Console.WriteLine ("Row: " + line);\r
 974                                 Console.WriteLine ("Name: " + ref_name.Name);\r
 975                                 Console.WriteLine ("Current [{0}] putting back [{1}]  ", putback_char, c);\r
 976                                 throw new Exception ("This should not happen putback on putback");\r
 977                         }\r
 978                         putback_char = c;\r
 979                 }\r
 980 \r
 981                 public bool advance ()\r
 982                 {\r
 983                         return peekChar () != -1;\r
 984                 }\r
 985 \r
 986                 public Object Value {\r
 987                         get {\r
 988                                 return val;\r
 989                         }\r
 990                 }\r
 991 \r
 992                 public Object value ()\r
 993                 {\r
 994                         return val;\r
 995                 }\r
 996                 \r
 997                 public int token ()\r
 998                 {\r
 999                         current_token = xtoken ();\r
1000                         return current_token;\r
1001                 }\r
1002 \r
1003                 static StringBuilder static_cmd_arg = new System.Text.StringBuilder ();\r
1004                 \r
1005                 void get_cmd_arg (out string cmd, out string arg)\r
1006                 {\r
1007                         int c;\r
1008                         \r
1009                         tokens_seen = false;\r
1010                         arg = "";\r
1011                         static_cmd_arg.Length = 0;\r
1012                                 \r
1013                         while ((c = getChar ()) != -1 && (c != '\n') && (c != ' ') && (c != '\t') && (c != '\r')){\r
1014                                 static_cmd_arg.Append ((char) c);\r
1015                         }\r
1016 \r
1017                         cmd = static_cmd_arg.ToString ();\r
1018 \r
1019                         if (c == '\n'){\r
1020                                 line++;\r
1021                                 ref_line++;\r
1022                                 return;\r
1023                         } else if (c == '\r')\r
1024                                 col = 0;\r
1025 \r
1026                         // skip over white space\r
1027                         while ((c = getChar ()) != -1 && (c != '\n') && ((c == '\r') || (c == ' ') || (c == '\t')))\r
1028                                 ;\r
1029 \r
1030                         if (c == '\n'){\r
1031                                 line++;\r
1032                                 ref_line++;\r
1033                                 return;\r
1034                         } else if (c == '\r'){\r
1035                                 col = 0;\r
1036                                 return;\r
1037                         }\r
1038                         \r
1039                         static_cmd_arg.Length = 0;\r
1040                         static_cmd_arg.Append ((char) c);\r
1041                         \r
1042                         while ((c = getChar ()) != -1 && (c != '\n') && (c != '\r')){\r
1043                                 static_cmd_arg.Append ((char) c);\r
1044                         }\r
1045 \r
1046                         if (c == '\n'){\r
1047                                 line++;\r
1048                                 ref_line++;\r
1049                         } else if (c == '\r')\r
1050                                 col = 0;\r
1051                         arg = static_cmd_arg.ToString ().Trim ();\r
1052                 }\r
1053 \r
1054                 //\r
1055                 // Handles the #line directive\r
1056                 //\r
1057                 bool PreProcessLine (string arg)\r
1058                 {\r
1059                         if (arg == "")\r
1060                                 return false;\r
1061 \r
1062                         if (arg == "default"){\r
1063                                 ref_line = line;\r
1064                                 ref_name = file_name;\r
1065                                 Location.Push (ref_name);\r
1066                                 return true;\r
1067                         }\r
1068                         \r
1069                         try {\r
1070                                 int pos;\r
1071 \r
1072                                 if ((pos = arg.IndexOf (' ')) != -1 && pos != 0){\r
1073                                         ref_line = System.Int32.Parse (arg.Substring (0, pos));\r
1074                                         pos++;\r
1075                                         \r
1076                                         char [] quotes = { '\"' };\r
1077                                         \r
1078                                         string name = arg.Substring (pos). Trim (quotes);\r
1079                                         ref_name = Location.LookupFile (name);\r
1080                                         Location.Push (ref_name);\r
1081                                 } else {\r
1082                                         ref_line = System.Int32.Parse (arg);\r
1083                                 }\r
1084                                 \r
1085                                 ref_line--;\r
1086                         } catch {\r
1087                                 return false;\r
1088                         }\r
1089                         \r
1090                         return true;\r
1091                 }\r
1092 \r
1093                 //\r
1094                 // Handles #define and #undef\r
1095                 //\r
1096                 void PreProcessDefinition (bool is_define, string arg)\r
1097                 {\r
1098                         if (arg == "" || arg == "true" || arg == "false"){\r
1099                                 Report.Error (1001, Location, "Missing identifer to pre-processor directive");\r
1100                                 return;\r
1101                         }\r
1102 \r
1103                         char[] whitespace = { ' ', '\t' };\r
1104                         if (arg.IndexOfAny (whitespace) != -1){\r
1105                                 Report.Error (1025, Location, "Single-line comment or end-of-line expected");\r
1106                                 return;\r
1107                         }\r
1108 \r
1109                         foreach (char c in arg){\r
1110                                 if (!Char.IsLetter (c) && (c != '_')){\r
1111                                         Report.Error (1001, Location, "Identifier expected");\r
1112                                         return;\r
1113                                 }\r
1114                         }\r
1115 \r
1116                         if (is_define){\r
1117                                 if (defines == null)\r
1118                                         defines = new Hashtable ();\r
1119                                 define (arg);\r
1120                         } else {\r
1121                                 if (defines == null)\r
1122                                         return;\r
1123                                 if (defines.Contains (arg))\r
1124                                         defines.Remove (arg);\r
1125                         }\r
1126                 }\r
1127 \r
1128                 bool eval_val (string s)\r
1129                 {\r
1130                         if (s == "true")\r
1131                                 return true;\r
1132                         if (s == "false")\r
1133                                 return false;\r
1134                         \r
1135                         if (defines == null)\r
1136                                 return false;\r
1137                         if (defines.Contains (s))\r
1138                                 return true;\r
1139 \r
1140                         return false;\r
1141                 }\r
1142 \r
1143                 bool pp_primary (ref string s)\r
1144                 {\r
1145                         s = s.Trim ();\r
1146                         int len = s.Length;\r
1147 \r
1148                         if (len > 0){\r
1149                                 char c = s [0];\r
1150                                 \r
1151                                 if (c == '('){\r
1152                                         s = s.Substring (1);\r
1153                                         bool val = pp_expr (ref s);\r
1154                                         if (s.Length > 0 && s [0] == ')'){\r
1155                                                 s = s.Substring (1);\r
1156                                                 return val;\r
1157                                         }\r
1158                                         Error_InvalidDirective ();\r
1159                                         return false;\r
1160                                 }\r
1161                                 \r
1162                                 if (is_identifier_start_character (c)){\r
1163                                         int j = 1;\r
1164 \r
1165                                         while (j < len){\r
1166                                                 c = s [j];\r
1167                                                 \r
1168                                                 if (is_identifier_part_character (c)){\r
1169                                                         j++;\r
1170                                                         continue;\r
1171                                                 }\r
1172                                                 bool v = eval_val (s.Substring (0, j));\r
1173                                                 s = s.Substring (j);\r
1174                                                 return v;\r
1175                                         }\r
1176                                         bool vv = eval_val (s);\r
1177                                         s = "";\r
1178                                         return vv;\r
1179                                 }\r
1180                         }\r
1181                         Error_InvalidDirective ();\r
1182                         return false;\r
1183                 }\r
1184                 \r
1185                 bool pp_unary (ref string s)\r
1186                 {\r
1187                         s = s.Trim ();\r
1188                         int len = s.Length;\r
1189 \r
1190                         if (len > 0){\r
1191                                 if (s [0] == '!'){\r
1192                                         if (len > 1 && s [1] == '='){\r
1193                                                 Error_InvalidDirective ();\r
1194                                                 return false;\r
1195                                         }\r
1196                                         s = s.Substring (1);\r
1197                                         return ! pp_primary (ref s);\r
1198                                 } else\r
1199                                         return pp_primary (ref s);\r
1200                         } else {\r
1201                                 Error_InvalidDirective ();\r
1202                                 return false;\r
1203                         }\r
1204                 }\r
1205                 \r
1206                 bool pp_eq (ref string s)\r
1207                 {\r
1208                         bool va = pp_unary (ref s);\r
1209 \r
1210                         s = s.Trim ();\r
1211                         int len = s.Length;\r
1212                         if (len > 0){\r
1213                                 if (s [0] == '='){\r
1214                                         if (len > 2 && s [1] == '='){\r
1215                                                 s = s.Substring (2);\r
1216                                                 return va == pp_unary (ref s);\r
1217                                         } else {\r
1218                                                 Error_InvalidDirective ();\r
1219                                                 return false;\r
1220                                         }\r
1221                                 } else if (s [0] == '!' && len > 1 && s [1] == '='){\r
1222                                         s = s.Substring (2);\r
1223 \r
1224                                         return va != pp_unary (ref s);\r
1225 \r
1226                                 } \r
1227                         }\r
1228 \r
1229                         return va;\r
1230                                 \r
1231                 }\r
1232                 \r
1233                 bool pp_and (ref string s)\r
1234                 {\r
1235                         bool va = pp_eq (ref s);\r
1236 \r
1237                         s = s.Trim ();\r
1238                         int len = s.Length;\r
1239                         if (len > 0){\r
1240                                 if (s [0] == '&'){\r
1241                                         if (len > 2 && s [1] == '&'){\r
1242                                                 s = s.Substring (2);\r
1243                                                 return (va & pp_eq (ref s));\r
1244                                         } else {\r
1245                                                 Error_InvalidDirective ();\r
1246                                                 return false;\r
1247                                         }\r
1248                                 } \r
1249                         }\r
1250                         return va;\r
1251                 }\r
1252                 \r
1253                 //\r
1254                 // Evaluates an expression for `#if' or `#elif'\r
1255                 //\r
1256                 bool pp_expr (ref string s)\r
1257                 {\r
1258                         bool va = pp_and (ref s);\r
1259                         s = s.Trim ();\r
1260                         int len = s.Length;\r
1261                         if (len > 0){\r
1262                                 char c = s [0];\r
1263                                 \r
1264                                 if (c == '|'){\r
1265                                         if (len > 2 && s [1] == '|'){\r
1266                                                 s = s.Substring (2);\r
1267                                                 return va | pp_expr (ref s);\r
1268                                         } else {\r
1269                                                 Error_InvalidDirective ();\r
1270                                                 return false;\r
1271                                         }\r
1272                                 } \r
1273                         }\r
1274                         \r
1275                         return va;\r
1276                 }\r
1277 \r
1278                 bool eval (string s)\r
1279                 {\r
1280                         bool v = pp_expr (ref s);\r
1281                         s = s.Trim ();\r
1282                         if (s.Length != 0){\r
1283                                 Error_InvalidDirective ();\r
1284                                 return false;\r
1285                         }\r
1286 \r
1287                         return v;\r
1288                 }\r
1289                 \r
1290                 void Error_InvalidDirective ()\r
1291                 {\r
1292                         Report.Error (1517, Location, "Invalid pre-processor directive");\r
1293                 }\r
1294 \r
1295                 void Error_UnexpectedDirective (string extra)\r
1296                 {\r
1297                         Report.Error (\r
1298                                 1028, Location,\r
1299                                 "Unexpected processor directive (" + extra + ")");\r
1300                 }\r
1301 \r
1302                 void Error_TokensSeen ()\r
1303                 {\r
1304                         Report.Error (\r
1305                                 1032, Location,\r
1306                                 "Cannot define or undefine pre-processor symbols after a token in the file");\r
1307                 }\r
1308                 \r
1309                 //\r
1310                 // if true, then the code continues processing the code\r
1311                 // if false, the code stays in a loop until another directive is\r
1312                 // reached.\r
1313                 //\r
1314                 bool handle_preprocessing_directive (bool caller_is_taking)\r
1315                 {\r
1316                         char [] blank = { ' ', '\t' };\r
1317                         string cmd, arg;\r
1318                         bool region_directive = false;\r
1319 \r
1320                         get_cmd_arg (out cmd, out arg);\r
1321 \r
1322                         // Eat any trailing whitespaces and single-line comments\r
1323                         if (arg.IndexOf ("//") != -1)\r
1324                                 arg = arg.Substring (0, arg.IndexOf ("//"));\r
1325                         arg = arg.TrimEnd (' ', '\t');\r
1326 \r
1327                         //\r
1328                         // The first group of pre-processing instructions is always processed\r
1329                         //\r
1330                         switch (cmd){\r
1331                         case "line":\r
1332                                 if (!PreProcessLine (arg))\r
1333                                         Report.Error (\r
1334                                                 1576, Location,\r
1335                                                 "Argument to #line directive is missing or invalid");\r
1336                                 return true;\r
1337 \r
1338                         case "region":\r
1339                                 region_directive = true;\r
1340                                 arg = "true";\r
1341                                 goto case "if";\r
1342 \r
1343                         case "endregion":\r
1344                                 region_directive = true;\r
1345                                 goto case "endif";\r
1346                                 \r
1347                         case "if":\r
1348                                 if (arg == ""){\r
1349                                         Error_InvalidDirective ();\r
1350                                         return true;\r
1351                                 }\r
1352                                 bool taking = false;\r
1353                                 if (ifstack == null)\r
1354                                         ifstack = new Stack ();\r
1355 \r
1356                                 if (ifstack.Count == 0){\r
1357                                         taking = true;\r
1358                                 } else {\r
1359                                         int state = (int) ifstack.Peek ();\r
1360                                         if ((state & TAKING) != 0)\r
1361                                                 taking = true;\r
1362                                 }\r
1363 \r
1364                                 if (eval (arg) && taking){\r
1365                                         int push = TAKING | TAKEN_BEFORE | PARENT_TAKING;\r
1366                                         if (region_directive)\r
1367                                                 push |= REGION;\r
1368                                         ifstack.Push (push);\r
1369                                         return true;\r
1370                                 } else {\r
1371                                         int push = (taking ? PARENT_TAKING : 0);\r
1372                                         if (region_directive)\r
1373                                                 push |= REGION;\r
1374                                         ifstack.Push (push);\r
1375                                         return false;\r
1376                                 }\r
1377                                 \r
1378                         case "endif":\r
1379                                 if (ifstack == null || ifstack.Count == 0){\r
1380                                         Error_UnexpectedDirective ("no #if for this #endif");\r
1381                                         return true;\r
1382                                 } else {\r
1383                                         int pop = (int) ifstack.Pop ();\r
1384                                         \r
1385                                         if (region_directive && ((pop & REGION) == 0))\r
1386                                                 Report.Error (1027, Location, "#endif directive expected");\r
1387                                         else if (!region_directive && ((pop & REGION) != 0))\r
1388                                                 Report.Error (1038, Location, "#endregion directive expected");\r
1389                                         \r
1390                                         if (ifstack.Count == 0)\r
1391                                                 return true;\r
1392                                         else {\r
1393                                                 int state = (int) ifstack.Peek ();\r
1394 \r
1395                                                 if ((state & TAKING) != 0)\r
1396                                                         return true;\r
1397                                                 else\r
1398                                                         return false;\r
1399                                         }\r
1400                                 }\r
1401 \r
1402                         case "elif":\r
1403                                 if (ifstack == null || ifstack.Count == 0){\r
1404                                         Error_UnexpectedDirective ("no #if for this #elif");\r
1405                                         return true;\r
1406                                 } else {\r
1407                                         int state = (int) ifstack.Peek ();\r
1408 \r
1409                                         if ((state & REGION) != 0) {\r
1410                                                 Report.Error (1038, Location, "#endregion directive expected");\r
1411                                                 return true;\r
1412                                         }\r
1413 \r
1414                                         if ((state & ELSE_SEEN) != 0){\r
1415                                                 Error_UnexpectedDirective ("#elif not valid after #else");\r
1416                                                 return true;\r
1417                                         }\r
1418 \r
1419                                         if ((state & (TAKEN_BEFORE | TAKING)) != 0)\r
1420                                                 return false;\r
1421 \r
1422                                         if (eval (arg) && ((state & PARENT_TAKING) != 0)){\r
1423                                                 state = (int) ifstack.Pop ();\r
1424                                                 ifstack.Push (state | TAKING | TAKEN_BEFORE);\r
1425                                                 return true;\r
1426                                         } else \r
1427                                                 return false;\r
1428                                 }\r
1429 \r
1430                         case "else":\r
1431                                 if (ifstack == null || ifstack.Count == 0){\r
1432                                         Report.Error (\r
1433                                                 1028, Location,\r
1434                                                 "Unexpected processor directive (no #if for this #else)");\r
1435                                         return true;\r
1436                                 } else {\r
1437                                         int state = (int) ifstack.Peek ();\r
1438 \r
1439                                         if ((state & REGION) != 0) {\r
1440                                                 Report.Error (1038, Location, "#endregion directive expected");\r
1441                                                 return true;\r
1442                                         }\r
1443 \r
1444                                         if ((state & ELSE_SEEN) != 0){\r
1445                                                 Error_UnexpectedDirective ("#else within #else");\r
1446                                                 return true;\r
1447                                         }\r
1448 \r
1449                                         ifstack.Pop ();\r
1450 \r
1451                                         bool ret;\r
1452                                         if ((state & TAKEN_BEFORE) == 0){\r
1453                                                 ret = ((state & PARENT_TAKING) != 0);\r
1454                                         } else\r
1455                                                 ret = false;\r
1456                                         \r
1457                                         if (ret)\r
1458                                                 state |= TAKING;\r
1459                                         else\r
1460                                                 state &= ~TAKING;\r
1461                                         \r
1462                                         ifstack.Push (state | ELSE_SEEN);\r
1463                                         \r
1464                                         return ret;\r
1465                                 }\r
1466                         }\r
1467 \r
1468                         //\r
1469                         // These are only processed if we are in a `taking' block\r
1470                         //\r
1471                         if (!caller_is_taking)\r
1472                                 return false;\r
1473                                         \r
1474                         switch (cmd){\r
1475                         case "define":\r
1476                                 if (any_token_seen){\r
1477                                         Error_TokensSeen ();\r
1478                                         return true;\r
1479                                 }\r
1480                                 PreProcessDefinition (true, arg);\r
1481                                 return true;\r
1482 \r
1483                         case "undef":\r
1484                                 if (any_token_seen){\r
1485                                         Error_TokensSeen ();\r
1486                                         return true;\r
1487                                 }\r
1488                                 PreProcessDefinition (false, arg);\r
1489                                 return true;\r
1490 \r
1491                         case "error":\r
1492                                 Report.Error (1029, Location, "#error: '" + arg + "'");\r
1493                                 return true;\r
1494 \r
1495                         case "warning":\r
1496                                 Report.Warning (1030, Location, "#warning: '" + arg + "'");\r
1497                                 return true;\r
1498                         }\r
1499 \r
1500                         Report.Error (1024, Location, "Preprocessor directive expected (got: " + cmd + ")");\r
1501                         return true;\r
1502 \r
1503                 }\r
1504 \r
1505                 private int consume_string (bool quoted) \r
1506                 {\r
1507                         int c;\r
1508                         string_builder.Length = 0;\r
1509                                                                 \r
1510                         while ((c = getChar ()) != -1){\r
1511                                 if (c == '"'){\r
1512                                         if (quoted && peekChar () == '"'){\r
1513                                                 string_builder.Append ((char) c);\r
1514                                                 getChar ();\r
1515                                                 continue;\r
1516                                         } else {\r
1517                                                 val = string_builder.ToString ();\r
1518                                                 return Token.LITERAL_STRING;\r
1519                                         }\r
1520                                 }\r
1521 \r
1522                                 if (c == '\n'){\r
1523                                         if (!quoted)\r
1524                                                 Report.Error (1010, Location, "Newline in constant");\r
1525                                         line++;\r
1526                                         ref_line++;\r
1527                                         col = 0;\r
1528                                 } else\r
1529                                         col++;\r
1530 \r
1531                                 if (!quoted){\r
1532                                         c = escape (c);\r
1533                                         if (c == -1)\r
1534                                                 return Token.ERROR;\r
1535                                 }\r
1536                                 string_builder.Append ((char) c);\r
1537                         }\r
1538 \r
1539                         Report.Error (1039, Location, "Unterminated string literal");\r
1540                         return Token.EOF;\r
1541                 }\r
1542 \r
1543                 private int consume_identifier (int s, bool quoted) \r
1544                 {\r
1545                         int pos = 1;\r
1546                         int c;\r
1547                         \r
1548                         id_builder [0] = (char) s;\r
1549                                         \r
1550                         while ((c = reader.Read ()) != -1) {\r
1551                                 if (is_identifier_part_character ((char) c)){\r
1552                                         if (pos == max_id_size){\r
1553                                                 Report.Error (645, Location, "Identifier too long (limit is 512 chars)");\r
1554                                                 return Token.ERROR;\r
1555                                         }\r
1556                                         \r
1557                                         id_builder [pos++] = (char) c;\r
1558                                         putback_char = -1;\r
1559                                         col++;\r
1560                                 } else {\r
1561                                         putback_char = c;\r
1562                                         break;\r
1563                                 }\r
1564                         }\r
1565 \r
1566                         string ids = new String (id_builder, 0, pos);\r
1567 \r
1568                         if (s >= 'a'){\r
1569                                 int keyword = GetKeyword (ids);\r
1570                                 if (keyword == -1 || quoted){\r
1571                                         val = ids;\r
1572                                         return Token.IDENTIFIER;\r
1573                                 }\r
1574                                 return keyword;\r
1575                         }\r
1576                         val = ids;\r
1577                         return Token.IDENTIFIER;\r
1578                 }\r
1579                 \r
1580                 public int xtoken ()\r
1581                 {\r
1582                         int t;\r
1583                         bool doread = false;\r
1584                         int c;\r
1585 \r
1586                         val = null;\r
1587                         // optimization: eliminate col and implement #directive semantic correctly.\r
1588                         for (;(c = getChar ()) != -1; col++) {\r
1589                                 if (c == ' ' || c == '\t' || c == '\f' || c == '\v' || c == '\r' || c == 0xa0){\r
1590                                         \r
1591                                         if (c == '\t')\r
1592                                                 col = (((col + 8) / 8) * 8) - 1;\r
1593                                         continue;\r
1594                                 }\r
1595 \r
1596                                 // Handle double-slash comments.\r
1597                                 if (c == '/'){\r
1598                                         int d = peekChar ();\r
1599                                 \r
1600                                         if (d == '/'){\r
1601                                                 getChar ();\r
1602                                                 while ((d = getChar ()) != -1 && (d != '\n') && d != '\r')\r
1603                                                         col++;\r
1604                                                 if (d == '\n'){\r
1605                                                         line++;\r
1606                                                         ref_line++;\r
1607                                                         col = 0;\r
1608                                                 }\r
1609                                                 any_token_seen |= tokens_seen;\r
1610                                                 tokens_seen = false;\r
1611                                                 continue;\r
1612                                         } else if (d == '*'){\r
1613                                                 getChar ();\r
1614 \r
1615                                                 while ((d = getChar ()) != -1){\r
1616                                                         if (d == '*' && peekChar () == '/'){\r
1617                                                                 getChar ();\r
1618                                                                 col++;\r
1619                                                                 break;\r
1620                                                         }\r
1621                                                         if (d == '\n'){\r
1622                                                                 line++;\r
1623                                                                 ref_line++;\r
1624                                                                 col = 0;\r
1625                                                                 any_token_seen |= tokens_seen;\r
1626                                                                 tokens_seen = false;\r
1627                                                         }\r
1628                                                 }\r
1629                                                 continue;\r
1630                                         }\r
1631                                         goto is_punct_label;\r
1632                                 }\r
1633 \r
1634                                 \r
1635                                 if (is_identifier_start_character ((char)c)){\r
1636                                         tokens_seen = true;\r
1637                                         return consume_identifier (c, false);\r
1638                                 }\r
1639 \r
1640                         is_punct_label:\r
1641                                 if ((t = is_punct ((char)c, ref doread)) != Token.ERROR){\r
1642                                         tokens_seen = true;\r
1643                                         if (doread){\r
1644                                                 getChar ();\r
1645                                                 col++;\r
1646                                         }\r
1647                                         return t;\r
1648                                 }\r
1649 \r
1650                                 // white space\r
1651                                 if (c == '\n'){\r
1652                                         line++;\r
1653                                         ref_line++;\r
1654                                         col = 0;\r
1655                                         any_token_seen |= tokens_seen;\r
1656                                         tokens_seen = false;\r
1657                                         continue;\r
1658                                 }\r
1659 \r
1660                                 if (c >= '0' && c <= '9'){\r
1661                                         tokens_seen = true;\r
1662                                         return is_number (c);\r
1663                                 }\r
1664 \r
1665                                 if (c == '.'){\r
1666                                         tokens_seen = true;\r
1667                                         int peek = peekChar ();\r
1668                                         if (peek >= '0' && peek <= '9')\r
1669                                                 return is_number (c);\r
1670                                         return Token.DOT;\r
1671                                 }\r
1672                                 \r
1673                                 /* For now, ignore pre-processor commands */\r
1674                                 // FIXME: In C# the '#' is not limited to appear\r
1675                                 // on the first column.\r
1676                                 if (c == '#' && !tokens_seen){\r
1677                                         bool cont = true;\r
1678                                         \r
1679                                 start_again:\r
1680                                         \r
1681                                         cont = handle_preprocessing_directive (cont);\r
1682 \r
1683                                         if (cont){\r
1684                                                 col = 0;\r
1685                                                 continue;\r
1686                                         }\r
1687                                         col = 1;\r
1688 \r
1689                                         bool skipping = false;\r
1690                                         for (;(c = getChar ()) != -1; col++){\r
1691                                                 if (c == '\n'){\r
1692                                                         col = 0;\r
1693                                                         line++;\r
1694                                                         ref_line++;\r
1695                                                         skipping = false;\r
1696                                                 } else if (c == ' ' || c == '\t' || c == '\v' || c == '\r' || c == 0xa0)\r
1697                                                         continue;\r
1698                                                 else if (c != '#')\r
1699                                                         skipping = true;\r
1700                                                 if (c == '#' && !skipping)\r
1701                                                         goto start_again;\r
1702                                         }\r
1703                                         any_token_seen |= tokens_seen;\r
1704                                         tokens_seen = false;\r
1705                                         if (c == -1)\r
1706                                                 Report.Error (1027, Location, "#endif/#endregion expected");\r
1707                                         continue;\r
1708                                 }\r
1709                                 \r
1710                                 if (c == '"') \r
1711                                         return consume_string (false);\r
1712 \r
1713                                 if (c == '\''){\r
1714                                         c = getChar ();\r
1715                                         tokens_seen = true;\r
1716                                         if (c == '\''){\r
1717                                                 error_details = "Empty character literal";\r
1718                                                 Report.Error (1011, Location, error_details);\r
1719                                                 return Token.ERROR;\r
1720                                         }\r
1721                                         c = escape (c);\r
1722                                         if (c == -1)\r
1723                                                 return Token.ERROR;\r
1724                                         val = new System.Char ();\r
1725                                         val = (char) c;\r
1726                                         c = getChar ();\r
1727 \r
1728                                         if (c != '\''){\r
1729                                                 error_details = "Too many characters in character literal";\r
1730                                                 Report.Error (1012, Location, error_details);\r
1731 \r
1732                                                 // Try to recover, read until newline or next "'"\r
1733                                                 while ((c = getChar ()) != -1){\r
1734                                                         if (c == '\n' || c == '\''){\r
1735                                                                 line++;\r
1736                                                                 ref_line++;\r
1737                                                                 col = 0;\r
1738                                                                 break;\r
1739                                                         } else\r
1740                                                                 col++;\r
1741                                                         \r
1742                                                 }\r
1743                                                 return Token.ERROR;\r
1744                                         }\r
1745                                         return Token.LITERAL_CHARACTER;\r
1746                                 }\r
1747                                 \r
1748                                 if (c == '@') {\r
1749                                         c = getChar ();\r
1750                                         if (c == '"') {\r
1751                                                 tokens_seen = true;\r
1752                                                 return consume_string (true);\r
1753                                         } else if (is_identifier_start_character ((char) c)){\r
1754                                                 return consume_identifier (c, true);\r
1755                                         } else {\r
1756                                                 Report.Error (1033, Location, "'@' must be followed by string constant or identifier");\r
1757                                         }\r
1758                                 }\r
1759 \r
1760                                 error_details = ((char)c).ToString ();\r
1761                                 \r
1762                                 return Token.ERROR;\r
1763                         }\r
1764 \r
1765                         return Token.EOF;\r
1766                 }\r
1767 \r
1768                 public void cleanup ()\r
1769                 {\r
1770                         if (ifstack != null && ifstack.Count >= 1) {\r
1771                                 int state = (int) ifstack.Pop ();\r
1772                                 if ((state & REGION) != 0)\r
1773                                         Report.Error (1038, "#endregion directive expected");\r
1774                                 else \r
1775                                         Report.Error (1027, "#endif directive expected");\r
1776                         }\r
1777                                 \r
1778                 }\r
1779 \r
1780         }\r
1781 }\r
1782 \r