mcs/mcs/cs-tokenizer.cs

   1 // -*- coding: dos -*-\r
   2 //\r
   3 // cs-tokenizer.cs: The Tokenizer for the C# compiler\r
   4 //                  This also implements the preprocessor\r
   5 //\r
   6 // Author: Miguel de Icaza (miguel@gnu.org)\r
   7 //\r
   8 // Licensed under the terms of the GNU GPL\r
   9 //\r
  10 // (C) 2001, 2002 Ximian, Inc (http://www.ximian.com)\r
  11 //\r
  12 \r
  13 /*\r
  14  * TODO:\r
  15  *   Make sure we accept the proper Unicode ranges, per the spec.\r
  16  *   Report error 1032\r
  17 */\r
  18 \r
  19 using System;\r
  20 using System.Text;\r
  21 using System.Collections;\r
  22 using System.IO;\r
  23 using System.Globalization;\r
  24 using System.Reflection;\r
  25 \r
  26 namespace Mono.CSharp\r
  27 {\r
  28         /// <summary>\r
  29         ///    Tokenizer for C# source code. \r
  30         /// </summary>\r
  31 \r
  32         public class Tokenizer : yyParser.yyInput\r
  33         {\r
  34                 SeekableStreamReader reader;\r
  35                 public SourceFile ref_name;\r
  36                 public SourceFile file_name;\r
  37                 public int ref_line = 1;\r
  38                 public int line = 1;\r
  39                 public int col = 1;\r
  40                 public int current_token;\r
  41                 bool handle_get_set = false;\r
  42                 bool handle_remove_add = false;\r
  43                 bool handle_assembly = false;\r
  44 \r
  45                 //\r
  46                 // Whether tokens have been seen on this line\r
  47                 //\r
  48                 bool tokens_seen = false;\r
  49 \r
  50                 //\r
  51                 // Whether a token has been seen on the file\r
  52                 // This is needed because `define' is not allowed to be used\r
  53                 // after a token has been seen.\r
  54                 //\r
  55                 bool any_token_seen = false;\r
  56                 static Hashtable tokenValues;\r
  57 \r
  58                 private static Hashtable TokenValueName\r
  59                 {\r
  60                         get {\r
  61                                 if (tokenValues == null)\r
  62                                         tokenValues = GetTokenValueNameHash ();\r
  63 \r
  64                                 return tokenValues;\r
  65                         }\r
  66                 }\r
  67 \r
  68                 private static Hashtable GetTokenValueNameHash ()\r
  69                 {\r
  70                         Type t = typeof (Token);\r
  71                         FieldInfo [] fields = t.GetFields ();\r
  72                         Hashtable hash = new Hashtable ();\r
  73                         foreach (FieldInfo field in fields) {\r
  74                                 if (field.IsLiteral && field.IsStatic && field.FieldType == typeof (int))\r
  75                                         hash.Add (field.GetValue (null), field.Name);\r
  76                         }\r
  77                         return hash;\r
  78                 }\r
  79                 \r
  80                 //\r
  81                 // Returns a verbose representation of the current location\r
  82                 //\r
  83                 public string location {\r
  84                         get {\r
  85                                 string det;\r
  86 \r
  87                                 if (current_token == Token.ERROR)\r
  88                                         det = "detail: " + error_details;\r
  89                                 else\r
  90                                         det = "";\r
  91                                 \r
  92                                 // return "Line:     "+line+" Col: "+col + "\n" +\r
  93                                 //       "VirtLine: "+ref_line +\r
  94                                 //       " Token: "+current_token + " " + det;\r
  95                                 string current_token_name = TokenValueName [current_token] as string;\r
  96                                 if (current_token_name == null)\r
  97                                         current_token_name = current_token.ToString ();\r
  98 \r
  99                                 return String.Format ("{0} ({1},{2}), Token: {3} {4}", ref_name.Name,\r
 100                                                                                        ref_line,\r
 101                                                                                        col,\r
 102                                                                                        current_token_name,\r
 103                                                                                        det);\r
 104                         }\r
 105                 }\r
 106 \r
 107                 public bool PropertyParsing {\r
 108                         get {\r
 109                                 return handle_get_set;\r
 110                         }\r
 111 \r
 112                         set {\r
 113                                 handle_get_set = value;\r
 114                         }\r
 115                 }\r
 116 \r
 117                 public bool AssemblyTargetParsing {\r
 118                         get {\r
 119                                 return handle_assembly;\r
 120                         }\r
 121 \r
 122                         set {\r
 123                                 handle_assembly = value;\r
 124                         }\r
 125                 }\r
 126 \r
 127                 public bool EventParsing {\r
 128                         get {\r
 129                                 return handle_remove_add;\r
 130                         }\r
 131 \r
 132                         set {\r
 133                                 handle_remove_add = value;\r
 134                         }\r
 135                 }\r
 136                 \r
 137                 //\r
 138                 // Class variables\r
 139                 // \r
 140                 static CharArrayHashtable[] keywords;\r
 141                 static NumberStyles styles;\r
 142                 static NumberFormatInfo csharp_format_info;\r
 143                 \r
 144                 //\r
 145                 // Values for the associated token returned\r
 146                 //\r
 147                 int putback_char;\r
 148                 Object val;\r
 149 \r
 150                 //\r
 151                 // Pre-processor\r
 152                 //\r
 153                 Hashtable defines;\r
 154 \r
 155                 const int TAKING        = 1;\r
 156                 const int TAKEN_BEFORE  = 2;\r
 157                 const int ELSE_SEEN     = 4;\r
 158                 const int PARENT_TAKING = 8;\r
 159                 const int REGION        = 16;           \r
 160 \r
 161                 //\r
 162                 // pre-processor if stack state:\r
 163                 //\r
 164                 Stack ifstack;\r
 165 \r
 166                 static System.Text.StringBuilder string_builder;\r
 167 \r
 168                 const int max_id_size = 512;\r
 169                 static char [] id_builder = new char [max_id_size];\r
 170 \r
 171                 static CharArrayHashtable [] identifiers = new CharArrayHashtable [max_id_size + 1];\r
 172 \r
 173                 const int max_number_size = 128;\r
 174                 static char [] number_builder = new char [max_number_size];\r
 175                 static int number_pos;\r
 176                 \r
 177                 //\r
 178                 // Details about the error encoutered by the tokenizer\r
 179                 //\r
 180                 string error_details;\r
 181                 \r
 182                 public string error {\r
 183                         get {\r
 184                                 return error_details;\r
 185                         }\r
 186                 }\r
 187                 \r
 188                 public int Line {\r
 189                         get {\r
 190                                 return ref_line;\r
 191                         }\r
 192                 }\r
 193 \r
 194                 public int Col {\r
 195                         get {\r
 196                                 return col;\r
 197                         }\r
 198                 }\r
 199 \r
 200                 static void AddKeyword (string kw, int token) {\r
 201                         if (keywords [kw.Length] == null) {\r
 202                                 keywords [kw.Length] = new CharArrayHashtable (kw.Length);\r
 203                         }\r
 204                         keywords [kw.Length] [kw.ToCharArray ()] = token;\r
 205                 }\r
 206 \r
 207                 static void InitTokens ()\r
 208                 {\r
 209                         keywords = new CharArrayHashtable [64];\r
 210 \r
 211                         AddKeyword ("__arglist", Token.ARGLIST);\r
 212                         AddKeyword ("abstract", Token.ABSTRACT);\r
 213                         AddKeyword ("as", Token.AS);\r
 214                         AddKeyword ("add", Token.ADD);\r
 215                         AddKeyword ("assembly", Token.ASSEMBLY);\r
 216                         AddKeyword ("base", Token.BASE);\r
 217                         AddKeyword ("bool", Token.BOOL);\r
 218                         AddKeyword ("break", Token.BREAK);\r
 219                         AddKeyword ("byte", Token.BYTE);\r
 220                         AddKeyword ("case", Token.CASE);\r
 221                         AddKeyword ("catch", Token.CATCH);\r
 222                         AddKeyword ("char", Token.CHAR);\r
 223                         AddKeyword ("checked", Token.CHECKED);\r
 224                         AddKeyword ("class", Token.CLASS);\r
 225                         AddKeyword ("const", Token.CONST);\r
 226                         AddKeyword ("continue", Token.CONTINUE);\r
 227                         AddKeyword ("decimal", Token.DECIMAL);\r
 228                         AddKeyword ("default", Token.DEFAULT);\r
 229                         AddKeyword ("delegate", Token.DELEGATE);\r
 230                         AddKeyword ("do", Token.DO);\r
 231                         AddKeyword ("double", Token.DOUBLE);\r
 232                         AddKeyword ("else", Token.ELSE);\r
 233                         AddKeyword ("enum", Token.ENUM);\r
 234                         AddKeyword ("event", Token.EVENT);\r
 235                         AddKeyword ("explicit", Token.EXPLICIT);\r
 236                         AddKeyword ("extern", Token.EXTERN);\r
 237                         AddKeyword ("false", Token.FALSE);\r
 238                         AddKeyword ("finally", Token.FINALLY);\r
 239                         AddKeyword ("fixed", Token.FIXED);\r
 240                         AddKeyword ("float", Token.FLOAT);\r
 241                         AddKeyword ("for", Token.FOR);\r
 242                         AddKeyword ("foreach", Token.FOREACH);\r
 243                         AddKeyword ("goto", Token.GOTO);\r
 244                         AddKeyword ("get", Token.GET);\r
 245                         AddKeyword ("if", Token.IF);\r
 246                         AddKeyword ("implicit", Token.IMPLICIT);\r
 247                         AddKeyword ("in", Token.IN);\r
 248                         AddKeyword ("int", Token.INT);\r
 249                         AddKeyword ("interface", Token.INTERFACE);\r
 250                         AddKeyword ("internal", Token.INTERNAL);\r
 251                         AddKeyword ("is", Token.IS);\r
 252                         AddKeyword ("lock", Token.LOCK);\r
 253                         AddKeyword ("long", Token.LONG);\r
 254                         AddKeyword ("namespace", Token.NAMESPACE);\r
 255                         AddKeyword ("new", Token.NEW);\r
 256                         AddKeyword ("null", Token.NULL);\r
 257                         AddKeyword ("object", Token.OBJECT);\r
 258                         AddKeyword ("operator", Token.OPERATOR);\r
 259                         AddKeyword ("out", Token.OUT);\r
 260                         AddKeyword ("override", Token.OVERRIDE);\r
 261                         AddKeyword ("params", Token.PARAMS);\r
 262                         AddKeyword ("private", Token.PRIVATE);\r
 263                         AddKeyword ("protected", Token.PROTECTED);\r
 264                         AddKeyword ("public", Token.PUBLIC);\r
 265                         AddKeyword ("readonly", Token.READONLY);\r
 266                         AddKeyword ("ref", Token.REF);\r
 267                         AddKeyword ("remove", Token.REMOVE);\r
 268                         AddKeyword ("return", Token.RETURN);\r
 269                         AddKeyword ("sbyte", Token.SBYTE);\r
 270                         AddKeyword ("sealed", Token.SEALED);\r
 271                         AddKeyword ("set", Token.SET);\r
 272                         AddKeyword ("short", Token.SHORT);\r
 273                         AddKeyword ("sizeof", Token.SIZEOF);\r
 274                         AddKeyword ("stackalloc", Token.STACKALLOC);\r
 275                         AddKeyword ("static", Token.STATIC);\r
 276                         AddKeyword ("string", Token.STRING);\r
 277                         AddKeyword ("struct", Token.STRUCT);\r
 278                         AddKeyword ("switch", Token.SWITCH);\r
 279                         AddKeyword ("this", Token.THIS);\r
 280                         AddKeyword ("throw", Token.THROW);\r
 281                         AddKeyword ("true", Token.TRUE);\r
 282                         AddKeyword ("try", Token.TRY);\r
 283                         AddKeyword ("typeof", Token.TYPEOF);\r
 284                         AddKeyword ("uint", Token.UINT);\r
 285                         AddKeyword ("ulong", Token.ULONG);\r
 286                         AddKeyword ("unchecked", Token.UNCHECKED);\r
 287                         AddKeyword ("unsafe", Token.UNSAFE);\r
 288                         AddKeyword ("ushort", Token.USHORT);\r
 289                         AddKeyword ("using", Token.USING);\r
 290                         AddKeyword ("virtual", Token.VIRTUAL);\r
 291                         AddKeyword ("void", Token.VOID);\r
 292                         AddKeyword ("volatile", Token.VOLATILE);\r
 293                         AddKeyword ("while", Token.WHILE);\r
 294                         AddKeyword ("partial", Token.PARTIAL);\r
 295                 }\r
 296 \r
 297                 //\r
 298                 // Class initializer\r
 299                 // \r
 300                 static Tokenizer ()\r
 301                 {\r
 302                         InitTokens ();\r
 303                         csharp_format_info = NumberFormatInfo.InvariantInfo;\r
 304                         styles = NumberStyles.Float;\r
 305                         \r
 306                         string_builder = new System.Text.StringBuilder ();\r
 307                 }\r
 308 \r
 309                 int GetKeyword (char[] id, int id_len)\r
 310                 {\r
 311                         /*\r
 312                          * Keywords are stored in an array of hashtables grouped by their\r
 313                          * length.\r
 314                          */\r
 315 \r
 316                         if ((id_len >= keywords.Length) || (keywords [id_len] == null))\r
 317                                 return -1;\r
 318                         object o = keywords [id_len] [id];\r
 319 \r
 320                         if (o == null)\r
 321                                 return -1;\r
 322                         \r
 323                         int res = (int) o;\r
 324 \r
 325                         if (handle_get_set == false && (res == Token.GET || res == Token.SET))\r
 326                                 return -1;\r
 327                         if (handle_remove_add == false && (res == Token.REMOVE || res == Token.ADD))\r
 328                                 return -1;\r
 329                         if (handle_assembly == false && res == Token.ASSEMBLY)\r
 330                                 return -1;\r
 331 \r
 332                         return res;\r
 333                         \r
 334                 }\r
 335 \r
 336                 public Location Location {\r
 337                         get {\r
 338                                 return new Location (ref_line);\r
 339                         }\r
 340                 }\r
 341 \r
 342                 void define (string def)\r
 343                 {\r
 344                         if (!RootContext.AllDefines.Contains (def)){\r
 345                                 RootContext.AllDefines [def] = true;\r
 346                         }\r
 347                         if (defines.Contains (def))\r
 348                                 return;\r
 349                         defines [def] = true;\r
 350                 }\r
 351                 \r
 352                 public Tokenizer (SeekableStreamReader input, SourceFile file, ArrayList defs)\r
 353                 {\r
 354                         this.ref_name = file;\r
 355                         this.file_name = file;\r
 356                         reader = input;\r
 357                         \r
 358                         putback_char = -1;\r
 359 \r
 360                         if (defs != null){\r
 361                                 defines = new Hashtable ();\r
 362                                 foreach (string def in defs)\r
 363                                         define (def);\r
 364                         }\r
 365 \r
 366                         //\r
 367                         // FIXME: This could be `Location.Push' but we have to\r
 368                         // find out why the MS compiler allows this\r
 369                         //\r
 370                         Mono.CSharp.Location.Push (file);\r
 371                 }\r
 372 \r
 373                 public static void Cleanup () {\r
 374                         identifiers = null;\r
 375                 }\r
 376 \r
 377                 static bool is_identifier_start_character (char c)\r
 378                 {\r
 379                         return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || c == '_' || Char.IsLetter (c);\r
 380                 }\r
 381 \r
 382                 static bool is_identifier_part_character (char c)\r
 383                 {\r
 384                         return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '_' || (c >= '0' && c <= '9') || Char.IsLetter (c);\r
 385                 }\r
 386                 \r
 387                 public static bool IsValidIdentifier (string s)\r
 388                 {\r
 389                         if (s == null || s.Length == 0)\r
 390                                 return false;\r
 391                         \r
 392                         if (!is_identifier_start_character (s [0]))\r
 393                                 return false;\r
 394                         \r
 395                         for (int i = 1; i < s.Length; i ++)\r
 396                                 if (! is_identifier_part_character (s [i]))\r
 397                                         return false;\r
 398                         \r
 399                         return true;\r
 400                 }\r
 401 \r
 402                 int is_punct (char c, ref bool doread)\r
 403                 {\r
 404                         int d;\r
 405                         int t;\r
 406 \r
 407                         doread = false;\r
 408 \r
 409                         switch (c){\r
 410                         case '{':\r
 411                                 return Token.OPEN_BRACE;\r
 412                         case '}':\r
 413                                 return Token.CLOSE_BRACE;\r
 414                         case '[':\r
 415                                 return Token.OPEN_BRACKET;\r
 416                         case ']':\r
 417                                 return Token.CLOSE_BRACKET;\r
 418                         case '(':\r
 419                                 return Token.OPEN_PARENS;\r
 420                         case ')': {\r
 421                                 if (deambiguate_close_parens == 0)\r
 422                                         return Token.CLOSE_PARENS;\r
 423 \r
 424                                 --deambiguate_close_parens;\r
 425 \r
 426                                 // Save current position and parse next token.\r
 427                                 int old = reader.Position;\r
 428                                 int new_token = token ();\r
 429                                 reader.Position = old;\r
 430                                 putback_char = -1;\r
 431 \r
 432                                 if (new_token == Token.OPEN_PARENS)\r
 433                                         return Token.CLOSE_PARENS_OPEN_PARENS;\r
 434                                 else if (new_token == Token.MINUS)\r
 435                                         return Token.CLOSE_PARENS_MINUS;\r
 436                                 else if (IsCastToken (new_token))\r
 437                                         return Token.CLOSE_PARENS_CAST;\r
 438                                 else\r
 439                                         return Token.CLOSE_PARENS_NO_CAST;\r
 440                         }\r
 441 \r
 442                         case ',':\r
 443                                 return Token.COMMA;\r
 444                         case ':':\r
 445                                 return Token.COLON;\r
 446                         case ';':\r
 447                                 return Token.SEMICOLON;\r
 448                         case '~':\r
 449                                 return Token.TILDE;\r
 450                         case '?':\r
 451                                 return Token.INTERR;\r
 452                         }\r
 453 \r
 454                         d = peekChar ();\r
 455                         if (c == '+'){\r
 456                                 \r
 457                                 if (d == '+')\r
 458                                         t = Token.OP_INC;\r
 459                                 else if (d == '=')\r
 460                                         t = Token.OP_ADD_ASSIGN;\r
 461                                 else\r
 462                                         return Token.PLUS;\r
 463                                 doread = true;\r
 464                                 return t;\r
 465                         }\r
 466                         if (c == '-'){\r
 467                                 if (d == '-')\r
 468                                         t = Token.OP_DEC;\r
 469                                 else if (d == '=')\r
 470                                         t = Token.OP_SUB_ASSIGN;\r
 471                                 else if (d == '>')\r
 472                                         t = Token.OP_PTR;\r
 473                                 else\r
 474                                         return Token.MINUS;\r
 475                                 doread = true;\r
 476                                 return t;\r
 477                         }\r
 478 \r
 479                         if (c == '!'){\r
 480                                 if (d == '='){\r
 481                                         doread = true;\r
 482                                         return Token.OP_NE;\r
 483                                 }\r
 484                                 return Token.BANG;\r
 485                         }\r
 486 \r
 487                         if (c == '='){\r
 488                                 if (d == '='){\r
 489                                         doread = true;\r
 490                                         return Token.OP_EQ;\r
 491                                 }\r
 492                                 return Token.ASSIGN;\r
 493                         }\r
 494 \r
 495                         if (c == '&'){\r
 496                                 if (d == '&'){\r
 497                                         doread = true;\r
 498                                         return Token.OP_AND;\r
 499                                 } else if (d == '='){\r
 500                                         doread = true;\r
 501                                         return Token.OP_AND_ASSIGN;\r
 502                                 }\r
 503                                 return Token.BITWISE_AND;\r
 504                         }\r
 505 \r
 506                         if (c == '|'){\r
 507                                 if (d == '|'){\r
 508                                         doread = true;\r
 509                                         return Token.OP_OR;\r
 510                                 } else if (d == '='){\r
 511                                         doread = true;\r
 512                                         return Token.OP_OR_ASSIGN;\r
 513                                 }\r
 514                                 return Token.BITWISE_OR;\r
 515                         }\r
 516 \r
 517                         if (c == '*'){\r
 518                                 if (d == '='){\r
 519                                         doread = true;\r
 520                                         return Token.OP_MULT_ASSIGN;\r
 521                                 }\r
 522                                 return Token.STAR;\r
 523                         }\r
 524 \r
 525                         if (c == '/'){\r
 526                                 if (d == '='){\r
 527                                         doread = true;\r
 528                                         return Token.OP_DIV_ASSIGN;\r
 529                                 }\r
 530                                 return Token.DIV;\r
 531                         }\r
 532 \r
 533                         if (c == '%'){\r
 534                                 if (d == '='){\r
 535                                         doread = true;\r
 536                                         return Token.OP_MOD_ASSIGN;\r
 537                                 }\r
 538                                 return Token.PERCENT;\r
 539                         }\r
 540 \r
 541                         if (c == '^'){\r
 542                                 if (d == '='){\r
 543                                         doread = true;\r
 544                                         return Token.OP_XOR_ASSIGN;\r
 545                                 }\r
 546                                 return Token.CARRET;\r
 547                         }\r
 548 \r
 549                         if (c == '<'){\r
 550                                 if (d == '<'){\r
 551                                         getChar ();\r
 552                                         d = peekChar ();\r
 553 \r
 554                                         if (d == '='){\r
 555                                                 doread = true;\r
 556                                                 return Token.OP_SHIFT_LEFT_ASSIGN;\r
 557                                         }\r
 558                                         return Token.OP_SHIFT_LEFT;\r
 559                                 } else if (d == '='){\r
 560                                         doread = true;\r
 561                                         return Token.OP_LE;\r
 562                                 }\r
 563                                 return Token.OP_LT;\r
 564                         }\r
 565 \r
 566                         if (c == '>'){\r
 567                                 if (d == '>'){\r
 568                                         getChar ();\r
 569                                         d = peekChar ();\r
 570 \r
 571                                         if (d == '='){\r
 572                                                 doread = true;\r
 573                                                 return Token.OP_SHIFT_RIGHT_ASSIGN;\r
 574                                         }\r
 575                                         return Token.OP_SHIFT_RIGHT;\r
 576                                 } else if (d == '='){\r
 577                                         doread = true;\r
 578                                         return Token.OP_GE;\r
 579                                 }\r
 580                                 return Token.OP_GT;\r
 581                         }\r
 582                         return Token.ERROR;\r
 583                 }\r
 584 \r
 585                 int deambiguate_close_parens = 0;\r
 586 \r
 587                 public void Deambiguate_CloseParens ()\r
 588                 {\r
 589                         putback (')');\r
 590                         deambiguate_close_parens++;\r
 591                 }\r
 592 \r
 593                 void Error_NumericConstantTooLong ()\r
 594                 {\r
 595                         Report.Error (1021, Location, "Numeric constant too long");                     \r
 596                 }\r
 597                 \r
 598                 bool decimal_digits (int c)\r
 599                 {\r
 600                         int d;\r
 601                         bool seen_digits = false;\r
 602                         \r
 603                         if (c != -1){\r
 604                                 if (number_pos == max_number_size)\r
 605                                         Error_NumericConstantTooLong ();\r
 606                                 number_builder [number_pos++] = (char) c;\r
 607                         }\r
 608                         \r
 609                         //\r
 610                         // We use peekChar2, because decimal_digits needs to do a \r
 611                         // 2-character look-ahead (5.ToString for example).\r
 612                         //\r
 613                         while ((d = peekChar2 ()) != -1){\r
 614                                 if (d >= '0' && d <= '9'){\r
 615                                         if (number_pos == max_number_size)\r
 616                                                 Error_NumericConstantTooLong ();\r
 617                                         number_builder [number_pos++] = (char) d;\r
 618                                         getChar ();\r
 619                                         seen_digits = true;\r
 620                                 } else\r
 621                                         break;\r
 622                         }\r
 623                         \r
 624                         return seen_digits;\r
 625                 }\r
 626 \r
 627                 bool is_hex (int e)\r
 628                 {\r
 629                         return (e >= '0' && e <= '9') || (e >= 'A' && e <= 'F') || (e >= 'a' && e <= 'f');\r
 630                 }\r
 631                 \r
 632                 void hex_digits (int c)\r
 633                 {\r
 634                         if (c != -1)\r
 635                                 number_builder [number_pos++] = (char) c;\r
 636                         \r
 637                 }\r
 638                 \r
 639                 int real_type_suffix (int c)\r
 640                 {\r
 641                         int t;\r
 642 \r
 643                         switch (c){\r
 644                         case 'F': case 'f':\r
 645                                 t =  Token.LITERAL_FLOAT;\r
 646                                 break;\r
 647                         case 'D': case 'd':\r
 648                                 t = Token.LITERAL_DOUBLE;\r
 649                                 break;\r
 650                         case 'M': case 'm':\r
 651                                  t= Token.LITERAL_DECIMAL;\r
 652                                 break;\r
 653                         default:\r
 654                                 return Token.NONE;\r
 655                         }\r
 656                         return t;\r
 657                 }\r
 658 \r
 659                 int integer_type_suffix (ulong ul, int c)\r
 660                 {\r
 661                         bool is_unsigned = false;\r
 662                         bool is_long = false;\r
 663 \r
 664                         if (c != -1){\r
 665                                 bool scanning = true;\r
 666                                 do {\r
 667                                         switch (c){\r
 668                                         case 'U': case 'u':\r
 669                                                 if (is_unsigned)\r
 670                                                         scanning = false;\r
 671                                                 is_unsigned = true;\r
 672                                                 getChar ();\r
 673                                                 break;\r
 674 \r
 675                                         case 'l':\r
 676                                                 if (!is_unsigned){\r
 677                                                         //\r
 678                                                         // if we have not seen anything in between\r
 679                                                         // report this error\r
 680                                                         //\r
 681                                                         Report.Warning (\r
 682                                                                 78, Location,\r
 683                                                         "the 'l' suffix is easily confused with digit `1'," +\r
 684                                                         " use 'L' for clarity");\r
 685                                                 }\r
 686                                                 goto case 'L';\r
 687                                                 \r
 688                                         case 'L': \r
 689                                                 if (is_long)\r
 690                                                         scanning = false;\r
 691                                                 is_long = true;\r
 692                                                 getChar ();\r
 693                                                 break;\r
 694                                                 \r
 695                                         default:\r
 696                                                 scanning = false;\r
 697                                                 break;\r
 698                                         }\r
 699                                         c = peekChar ();\r
 700                                 } while (scanning);\r
 701                         }\r
 702 \r
 703                         if (is_long && is_unsigned){\r
 704                                 val = ul;\r
 705                                 return Token.LITERAL_INTEGER;\r
 706                         } else if (is_unsigned){\r
 707                                 // uint if possible, or ulong else.\r
 708 \r
 709                                 if ((ul & 0xffffffff00000000) == 0)\r
 710                                         val = (uint) ul;\r
 711                                 else\r
 712                                         val = ul;\r
 713                         } else if (is_long){\r
 714                                 // long if possible, ulong otherwise\r
 715                                 if ((ul & 0x8000000000000000) != 0)\r
 716                                         val = ul;\r
 717                                 else\r
 718                                         val = (long) ul;\r
 719                         } else {\r
 720                                 // int, uint, long or ulong in that order\r
 721                                 if ((ul & 0xffffffff00000000) == 0){\r
 722                                         uint ui = (uint) ul;\r
 723                                         \r
 724                                         if ((ui & 0x80000000) != 0)\r
 725                                                 val = ui;\r
 726                                         else\r
 727                                                 val = (int) ui;\r
 728                                 } else {\r
 729                                         if ((ul & 0x8000000000000000) != 0)\r
 730                                                 val = ul;\r
 731                                         else\r
 732                                                 val = (long) ul;\r
 733                                 }\r
 734                         }\r
 735                         return Token.LITERAL_INTEGER;\r
 736                 }\r
 737                                 \r
 738                 //\r
 739                 // given `c' as the next char in the input decide whether\r
 740                 // we need to convert to a special type, and then choose\r
 741                 // the best representation for the integer\r
 742                 //\r
 743                 int adjust_int (int c)\r
 744                 {\r
 745                         try {\r
 746                                 if (number_pos > 9){\r
 747                                         ulong ul = (uint) (number_builder [0] - '0');\r
 748 \r
 749                                         for (int i = 1; i < number_pos; i++){\r
 750                                                 ul = checked ((ul * 10) + ((uint)(number_builder [i] - '0')));\r
 751                                         }\r
 752                                         return integer_type_suffix (ul, c);\r
 753                                 } else {\r
 754                                         uint ui = (uint) (number_builder [0] - '0');\r
 755 \r
 756                                         for (int i = 1; i < number_pos; i++){\r
 757                                                 ui = checked ((ui * 10) + ((uint)(number_builder [i] - '0')));\r
 758                                         }\r
 759                                         return integer_type_suffix (ui, c);\r
 760                                 }\r
 761                         } catch (OverflowException) {\r
 762                                 error_details = "Integral constant is too large";\r
 763                                 Report.Error (1021, Location, error_details);\r
 764                                 val = 0ul;\r
 765                                 return Token.LITERAL_INTEGER;\r
 766                         }\r
 767                 }\r
 768                 \r
 769                 int adjust_real (int t)\r
 770                 {\r
 771                         string s = new String (number_builder, 0, number_pos);\r
 772 \r
 773                         switch (t){\r
 774                         case Token.LITERAL_DECIMAL:\r
 775                                 try {\r
 776                                         val = System.Decimal.Parse (s, styles, csharp_format_info);\r
 777                                 } catch (OverflowException) {\r
 778                                         val = 0m;     \r
 779                                         error_details = "Floating-point constant is outside the range of the type 'decimal'";\r
 780                                         Report.Error (594, Location, error_details);\r
 781                                 }\r
 782                                 break;\r
 783                         case Token.LITERAL_FLOAT:\r
 784                                 try {\r
 785                                         val = (float) System.Double.Parse (s, styles, csharp_format_info);\r
 786                                 } catch (OverflowException) {\r
 787                                         val = 0.0f;     \r
 788                                         error_details = "Floating-point constant is outside the range of the type 'float'";\r
 789                                         Report.Error (594, Location, error_details);\r
 790                                 }\r
 791                                 break;\r
 792                                 \r
 793                         case Token.LITERAL_DOUBLE:\r
 794                         case Token.NONE:\r
 795                                 t = Token.LITERAL_DOUBLE;\r
 796                                 try {\r
 797                                         val = System.Double.Parse (s, styles, csharp_format_info);\r
 798                                 } catch (OverflowException) {\r
 799                                         val = 0.0;     \r
 800                                         error_details = "Floating-point constant is outside the range of the type 'double'";\r
 801                                         Report.Error (594, Location, error_details);\r
 802                                 }\r
 803                                 break;\r
 804                         }\r
 805                         return t;\r
 806                 }\r
 807 \r
 808                 int handle_hex ()\r
 809                 {\r
 810                         int d;\r
 811                         ulong ul;\r
 812                         \r
 813                         getChar ();\r
 814                         while ((d = peekChar ()) != -1){\r
 815                                 if (is_hex (d)){\r
 816                                         number_builder [number_pos++] = (char) d;\r
 817                                         getChar ();\r
 818                                 } else\r
 819                                         break;\r
 820                         }\r
 821                         \r
 822                         string s = new String (number_builder, 0, number_pos);\r
 823                         try {\r
 824                                 if (number_pos <= 8)\r
 825                                         ul = System.UInt32.Parse (s, NumberStyles.HexNumber);\r
 826                                 else\r
 827                                         ul = System.UInt64.Parse (s, NumberStyles.HexNumber);\r
 828                         } catch (OverflowException){\r
 829                                 error_details = "Integral constant is too large";\r
 830                                 Report.Error (1021, Location, error_details);\r
 831                                 val = 0ul;\r
 832                                 return Token.LITERAL_INTEGER;\r
 833                         }\r
 834                         \r
 835                         return integer_type_suffix (ul, peekChar ());\r
 836                 }\r
 837 \r
 838                 //\r
 839                 // Invoked if we know we have .digits or digits\r
 840                 //\r
 841                 int is_number (int c)\r
 842                 {\r
 843                         bool is_real = false;\r
 844                         int type;\r
 845 \r
 846                         number_pos = 0;\r
 847 \r
 848                         if (c >= '0' && c <= '9'){\r
 849                                 if (c == '0'){\r
 850                                         int peek = peekChar ();\r
 851 \r
 852                                         if (peek == 'x' || peek == 'X')\r
 853                                                 return handle_hex ();\r
 854                                 }\r
 855                                 decimal_digits (c);\r
 856                                 c = getChar ();\r
 857                         }\r
 858 \r
 859                         //\r
 860                         // We need to handle the case of\r
 861                         // "1.1" vs "1.string" (LITERAL_FLOAT vs NUMBER DOT IDENTIFIER)\r
 862                         //\r
 863                         if (c == '.'){\r
 864                                 if (decimal_digits ('.')){\r
 865                                         is_real = true;\r
 866                                         c = getChar ();\r
 867                                 } else {\r
 868                                         putback ('.');\r
 869                                         number_pos--;\r
 870                                         return adjust_int (-1);\r
 871                                 }\r
 872                         }\r
 873                         \r
 874                         if (c == 'e' || c == 'E'){\r
 875                                 is_real = true;\r
 876                                 if (number_pos == max_number_size)\r
 877                                         Error_NumericConstantTooLong ();\r
 878                                 number_builder [number_pos++] = 'e';\r
 879                                 c = getChar ();\r
 880                                 \r
 881                                 if (c == '+'){\r
 882                                         if (number_pos == max_number_size)\r
 883                                                 Error_NumericConstantTooLong ();\r
 884                                         number_builder [number_pos++] = '+';\r
 885                                         c = -1;\r
 886                                 } else if (c == '-') {\r
 887                                         if (number_pos == max_number_size)\r
 888                                                 Error_NumericConstantTooLong ();\r
 889                                         number_builder [number_pos++] = '-';\r
 890                                         c = -1;\r
 891                                 } else {\r
 892                                         if (number_pos == max_number_size)\r
 893                                                 Error_NumericConstantTooLong ();\r
 894                                         number_builder [number_pos++] = '+';\r
 895                                 }\r
 896                                         \r
 897                                 decimal_digits (c);\r
 898                                 c = getChar ();\r
 899                         }\r
 900 \r
 901                         type = real_type_suffix (c);\r
 902                         if (type == Token.NONE && !is_real){\r
 903                                 putback (c);\r
 904                                 return adjust_int (c);\r
 905                         } else \r
 906                                 is_real = true;\r
 907 \r
 908                         if (type == Token.NONE){\r
 909                                 putback (c);\r
 910                         }\r
 911                         \r
 912                         if (is_real)\r
 913                                 return adjust_real (type);\r
 914 \r
 915                         Console.WriteLine ("This should not be reached");\r
 916                         throw new Exception ("Is Number should never reach this point");\r
 917                 }\r
 918 \r
 919                 //\r
 920                 // Accepts exactly count (4 or 8) hex, no more no less\r
 921                 //\r
 922                 int getHex (int count, out bool error)\r
 923                 {\r
 924                         int i;\r
 925                         int total = 0;\r
 926                         int c;\r
 927                         int top = count != -1 ? count : 4;\r
 928                         \r
 929                         getChar ();\r
 930                         error = false;\r
 931                         for (i = 0; i < top; i++){\r
 932                                 c = getChar ();\r
 933                                 \r
 934                                 if (c >= '0' && c <= '9')\r
 935                                         c = (int) c - (int) '0';\r
 936                                 else if (c >= 'A' && c <= 'F')\r
 937                                         c = (int) c - (int) 'A' + 10;\r
 938                                 else if (c >= 'a' && c <= 'f')\r
 939                                         c = (int) c - (int) 'a' + 10;\r
 940                                 else {\r
 941                                         error = true;\r
 942                                         return 0;\r
 943                                 }\r
 944                                 \r
 945                                 total = (total * 16) + c;\r
 946                                 if (count == -1){\r
 947                                         int p = peekChar ();\r
 948                                         if (p == -1)\r
 949                                                 break;\r
 950                                         if (!is_hex ((char)p))\r
 951                                                 break;\r
 952                                 }\r
 953                         }\r
 954                         return total;\r
 955                 }\r
 956 \r
 957                 int escape (int c)\r
 958                 {\r
 959                         bool error;\r
 960                         int d;\r
 961                         int v;\r
 962 \r
 963                         d = peekChar ();\r
 964                         if (c != '\\')\r
 965                                 return c;\r
 966                         \r
 967                         switch (d){\r
 968                         case 'a':\r
 969                                 v = '\a'; break;\r
 970                         case 'b':\r
 971                                 v = '\b'; break;\r
 972                         case 'n':\r
 973                                 v = '\n'; break;\r
 974                         case 't':\r
 975                                 v = '\t'; break;\r
 976                         case 'v':\r
 977                                 v = '\v'; break;\r
 978                         case 'r':\r
 979                                 v = '\r'; break;\r
 980                         case '\\':\r
 981                                 v = '\\'; break;\r
 982                         case 'f':\r
 983                                 v = '\f'; break;\r
 984                         case '0':\r
 985                                 v = 0; break;\r
 986                         case '"':\r
 987                                 v = '"'; break;\r
 988                         case '\'':\r
 989                                 v = '\''; break;\r
 990                         case 'x':\r
 991                                 v = getHex (-1, out error);\r
 992                                 if (error)\r
 993                                         goto default;\r
 994                                 return v;\r
 995                         case 'u':\r
 996                                 v = getHex (4, out error);\r
 997                                 if (error)\r
 998                                         goto default;\r
 999                                 return v;\r
1000                         case 'U':\r
1001                                 v = getHex (8, out error);\r
1002                                 if (error)\r
1003                                         goto default;\r
1004                                 return v;\r
1005                         default:\r
1006                                 Report.Error (1009, Location, "Unrecognized escape sequence in " + (char)d);\r
1007                                 return d;\r
1008                         }\r
1009                         getChar ();\r
1010                         return v;\r
1011                 }\r
1012 \r
1013                 int getChar ()\r
1014                 {\r
1015                         if (putback_char != -1){\r
1016                                 int x = putback_char;\r
1017                                 putback_char = -1;\r
1018 \r
1019                                 return x;\r
1020                         }\r
1021                         return reader.Read ();\r
1022                 }\r
1023 \r
1024                 int peekChar ()\r
1025                 {\r
1026                         if (putback_char != -1)\r
1027                                 return putback_char;\r
1028                         putback_char = reader.Read ();\r
1029                         return putback_char;\r
1030                 }\r
1031 \r
1032                 int peekChar2 ()\r
1033                 {\r
1034                         if (putback_char != -1)\r
1035                                 return putback_char;\r
1036                         return reader.Peek ();\r
1037                 }\r
1038                 \r
1039                 void putback (int c)\r
1040                 {\r
1041                         if (putback_char != -1){\r
1042                                 Console.WriteLine ("Col: " + col);\r
1043                                 Console.WriteLine ("Row: " + line);\r
1044                                 Console.WriteLine ("Name: " + ref_name.Name);\r
1045                                 Console.WriteLine ("Current [{0}] putting back [{1}]  ", putback_char, c);\r
1046                                 throw new Exception ("This should not happen putback on putback");\r
1047                         }\r
1048                         putback_char = c;\r
1049                 }\r
1050 \r
1051                 public bool advance ()\r
1052                 {\r
1053                         return peekChar () != -1;\r
1054                 }\r
1055 \r
1056                 public Object Value {\r
1057                         get {\r
1058                                 return val;\r
1059                         }\r
1060                 }\r
1061 \r
1062                 public Object value ()\r
1063                 {\r
1064                         return val;\r
1065                 }\r
1066 \r
1067                 bool IsCastToken (int token)\r
1068                 {\r
1069                         switch (token) {\r
1070                         case Token.BANG:\r
1071                         case Token.TILDE:\r
1072                         case Token.IDENTIFIER:\r
1073                         case Token.LITERAL_INTEGER:\r
1074                         case Token.LITERAL_FLOAT:\r
1075                         case Token.LITERAL_DOUBLE:\r
1076                         case Token.LITERAL_DECIMAL:\r
1077                         case Token.LITERAL_CHARACTER:\r
1078                         case Token.LITERAL_STRING:\r
1079                         case Token.BASE:\r
1080                         case Token.CHECKED:\r
1081                         case Token.FALSE:\r
1082                         case Token.FIXED:\r
1083                         case Token.NEW:\r
1084                         case Token.NULL:\r
1085                         case Token.SIZEOF:\r
1086                         case Token.THIS:\r
1087                         case Token.THROW:\r
1088                         case Token.TRUE:\r
1089                         case Token.TYPEOF:\r
1090                         case Token.UNCHECKED:\r
1091                         case Token.UNSAFE:\r
1092 \r
1093                                 //\r
1094                                 // These can be part of a member access\r
1095                                 //\r
1096                         case Token.INT:\r
1097                         case Token.UINT:\r
1098                         case Token.SHORT:\r
1099                         case Token.USHORT:\r
1100                         case Token.LONG:\r
1101                         case Token.ULONG:\r
1102                         case Token.DOUBLE:\r
1103                         case Token.FLOAT:\r
1104                         case Token.CHAR:\r
1105                                 return true;\r
1106 \r
1107                         default:\r
1108                                 return false;\r
1109                         }\r
1110                 }\r
1111 \r
1112                 public int token ()\r
1113                 {\r
1114                         current_token = xtoken ();\r
1115                         return current_token;\r
1116                 }\r
1117 \r
1118                 static StringBuilder static_cmd_arg = new System.Text.StringBuilder ();\r
1119                 \r
1120                 void get_cmd_arg (out string cmd, out string arg)\r
1121                 {\r
1122                         int c;\r
1123                         \r
1124                         tokens_seen = false;\r
1125                         arg = "";\r
1126                         static_cmd_arg.Length = 0;\r
1127 \r
1128                         // skip over white space\r
1129                         while ((c = getChar ()) != -1 && (c != '\n') && ((c == '\r') || (c == ' ') || (c == '\t')))\r
1130                                 ;\r
1131 \r
1132 \r
1133                         while ((c != -1) && (c != '\n') && (c != ' ') && (c != '\t') && (c != '\r')){\r
1134                                 if (is_identifier_part_character ((char) c)){\r
1135                                         static_cmd_arg.Append ((char) c);\r
1136                                         c = getChar ();\r
1137                                 } else {\r
1138                                         putback (c);\r
1139                                         break;\r
1140                                 }\r
1141                         }\r
1142 \r
1143                         cmd = static_cmd_arg.ToString ();\r
1144 \r
1145                         if (c == '\n'){\r
1146                                 line++;\r
1147                                 ref_line++;\r
1148                                 return;\r
1149                         } else if (c == '\r')\r
1150                                 col = 0;\r
1151 \r
1152                         // skip over white space\r
1153                         while ((c = getChar ()) != -1 && (c != '\n') && ((c == '\r') || (c == ' ') || (c == '\t')))\r
1154                                 ;\r
1155 \r
1156                         if (c == '\n'){\r
1157                                 line++;\r
1158                                 ref_line++;\r
1159                                 return;\r
1160                         } else if (c == '\r'){\r
1161                                 col = 0;\r
1162                                 return;\r
1163                         }\r
1164                         \r
1165                         static_cmd_arg.Length = 0;\r
1166                         static_cmd_arg.Append ((char) c);\r
1167                         \r
1168                         while ((c = getChar ()) != -1 && (c != '\n') && (c != '\r')){\r
1169                                 static_cmd_arg.Append ((char) c);\r
1170                         }\r
1171 \r
1172                         if (c == '\n'){\r
1173                                 line++;\r
1174                                 ref_line++;\r
1175                         } else if (c == '\r')\r
1176                                 col = 0;\r
1177                         arg = static_cmd_arg.ToString ().Trim ();\r
1178                 }\r
1179 \r
1180                 //\r
1181                 // Handles the #line directive\r
1182                 //\r
1183                 bool PreProcessLine (string arg)\r
1184                 {\r
1185                         if (arg == "")\r
1186                                 return false;\r
1187 \r
1188                         if (arg == "default"){\r
1189                                 ref_line = line;\r
1190                                 ref_name = file_name;\r
1191                                 Location.Push (ref_name);\r
1192                                 return true;\r
1193                         } else if (arg == "hidden"){\r
1194                                 //\r
1195                                 // We ignore #line hidden\r
1196                                 //\r
1197                                 return true;\r
1198                         }\r
1199 \r
1200                         try {\r
1201                                 int pos;\r
1202 \r
1203                                 if ((pos = arg.IndexOf (' ')) != -1 && pos != 0){\r
1204                                         ref_line = System.Int32.Parse (arg.Substring (0, pos));\r
1205                                         pos++;\r
1206                                         \r
1207                                         char [] quotes = { '\"' };\r
1208                                         \r
1209                                         string name = arg.Substring (pos). Trim (quotes);\r
1210                                         ref_name = Location.LookupFile (name);\r
1211                                         file_name.HasLineDirective = true;\r
1212                                         ref_name.HasLineDirective = true;\r
1213                                         Location.Push (ref_name);\r
1214                                 } else {\r
1215                                         ref_line = System.Int32.Parse (arg);\r
1216                                 }\r
1217                         } catch {\r
1218                                 return false;\r
1219                         }\r
1220                         \r
1221                         return true;\r
1222                 }\r
1223 \r
1224                 //\r
1225                 // Handles #define and #undef\r
1226                 //\r
1227                 void PreProcessDefinition (bool is_define, string arg)\r
1228                 {\r
1229                         if (arg == "" || arg == "true" || arg == "false"){\r
1230                                 Report.Error (1001, Location, "Missing identifer to pre-processor directive");\r
1231                                 return;\r
1232                         }\r
1233 \r
1234                         char[] whitespace = { ' ', '\t' };\r
1235                         if (arg.IndexOfAny (whitespace) != -1){\r
1236                                 Report.Error (1025, Location, "Single-line comment or end-of-line expected");\r
1237                                 return;\r
1238                         }\r
1239 \r
1240                         if (!is_identifier_start_character (arg [0]))\r
1241                                 Report.Error (1001, Location, "Identifier expected: " + arg);\r
1242                         \r
1243                         foreach (char c in arg.Substring (1)){\r
1244                                 if (!is_identifier_part_character (c)){\r
1245                                         Report.Error (1001, Location, "Identifier expected: " + arg);\r
1246                                         return;\r
1247                                 }\r
1248                         }\r
1249 \r
1250                         if (is_define){\r
1251                                 if (defines == null)\r
1252                                         defines = new Hashtable ();\r
1253                                 define (arg);\r
1254                         } else {\r
1255                                 if (defines == null)\r
1256                                         return;\r
1257                                 if (defines.Contains (arg))\r
1258                                         defines.Remove (arg);\r
1259                         }\r
1260                 }\r
1261 \r
1262                 bool eval_val (string s)\r
1263                 {\r
1264                         if (s == "true")\r
1265                                 return true;\r
1266                         if (s == "false")\r
1267                                 return false;\r
1268                         \r
1269                         if (defines == null)\r
1270                                 return false;\r
1271                         if (defines.Contains (s))\r
1272                                 return true;\r
1273 \r
1274                         return false;\r
1275                 }\r
1276 \r
1277                 bool pp_primary (ref string s)\r
1278                 {\r
1279                         s = s.Trim ();\r
1280                         int len = s.Length;\r
1281 \r
1282                         if (len > 0){\r
1283                                 char c = s [0];\r
1284                                 \r
1285                                 if (c == '('){\r
1286                                         s = s.Substring (1);\r
1287                                         bool val = pp_expr (ref s);\r
1288                                         if (s.Length > 0 && s [0] == ')'){\r
1289                                                 s = s.Substring (1);\r
1290                                                 return val;\r
1291                                         }\r
1292                                         Error_InvalidDirective ();\r
1293                                         return false;\r
1294                                 }\r
1295                                 \r
1296                                 if (is_identifier_start_character (c)){\r
1297                                         int j = 1;\r
1298 \r
1299                                         while (j < len){\r
1300                                                 c = s [j];\r
1301                                                 \r
1302                                                 if (is_identifier_part_character (c)){\r
1303                                                         j++;\r
1304                                                         continue;\r
1305                                                 }\r
1306                                                 bool v = eval_val (s.Substring (0, j));\r
1307                                                 s = s.Substring (j);\r
1308                                                 return v;\r
1309                                         }\r
1310                                         bool vv = eval_val (s);\r
1311                                         s = "";\r
1312                                         return vv;\r
1313                                 }\r
1314                         }\r
1315                         Error_InvalidDirective ();\r
1316                         return false;\r
1317                 }\r
1318                 \r
1319                 bool pp_unary (ref string s)\r
1320                 {\r
1321                         s = s.Trim ();\r
1322                         int len = s.Length;\r
1323 \r
1324                         if (len > 0){\r
1325                                 if (s [0] == '!'){\r
1326                                         if (len > 1 && s [1] == '='){\r
1327                                                 Error_InvalidDirective ();\r
1328                                                 return false;\r
1329                                         }\r
1330                                         s = s.Substring (1);\r
1331                                         return ! pp_primary (ref s);\r
1332                                 } else\r
1333                                         return pp_primary (ref s);\r
1334                         } else {\r
1335                                 Error_InvalidDirective ();\r
1336                                 return false;\r
1337                         }\r
1338                 }\r
1339                 \r
1340                 bool pp_eq (ref string s)\r
1341                 {\r
1342                         bool va = pp_unary (ref s);\r
1343 \r
1344                         s = s.Trim ();\r
1345                         int len = s.Length;\r
1346                         if (len > 0){\r
1347                                 if (s [0] == '='){\r
1348                                         if (len > 2 && s [1] == '='){\r
1349                                                 s = s.Substring (2);\r
1350                                                 return va == pp_unary (ref s);\r
1351                                         } else {\r
1352                                                 Error_InvalidDirective ();\r
1353                                                 return false;\r
1354                                         }\r
1355                                 } else if (s [0] == '!' && len > 1 && s [1] == '='){\r
1356                                         s = s.Substring (2);\r
1357 \r
1358                                         return va != pp_unary (ref s);\r
1359 \r
1360                                 } \r
1361                         }\r
1362 \r
1363                         return va;\r
1364                                 \r
1365                 }\r
1366                 \r
1367                 bool pp_and (ref string s)\r
1368                 {\r
1369                         bool va = pp_eq (ref s);\r
1370 \r
1371                         s = s.Trim ();\r
1372                         int len = s.Length;\r
1373                         if (len > 0){\r
1374                                 if (s [0] == '&'){\r
1375                                         if (len > 2 && s [1] == '&'){\r
1376                                                 s = s.Substring (2);\r
1377                                                 return (va & pp_eq (ref s));\r
1378                                         } else {\r
1379                                                 Error_InvalidDirective ();\r
1380                                                 return false;\r
1381                                         }\r
1382                                 } \r
1383                         }\r
1384                         return va;\r
1385                 }\r
1386                 \r
1387                 //\r
1388                 // Evaluates an expression for `#if' or `#elif'\r
1389                 //\r
1390                 bool pp_expr (ref string s)\r
1391                 {\r
1392                         bool va = pp_and (ref s);\r
1393                         s = s.Trim ();\r
1394                         int len = s.Length;\r
1395                         if (len > 0){\r
1396                                 char c = s [0];\r
1397                                 \r
1398                                 if (c == '|'){\r
1399                                         if (len > 2 && s [1] == '|'){\r
1400                                                 s = s.Substring (2);\r
1401                                                 return va | pp_expr (ref s);\r
1402                                         } else {\r
1403                                                 Error_InvalidDirective ();\r
1404                                                 return false;\r
1405                                         }\r
1406                                 } \r
1407                         }\r
1408                         \r
1409                         return va;\r
1410                 }\r
1411 \r
1412                 bool eval (string s)\r
1413                 {\r
1414                         bool v = pp_expr (ref s);\r
1415                         s = s.Trim ();\r
1416                         if (s.Length != 0){\r
1417                                 Error_InvalidDirective ();\r
1418                                 return false;\r
1419                         }\r
1420 \r
1421                         return v;\r
1422                 }\r
1423                 \r
1424                 void Error_InvalidDirective ()\r
1425                 {\r
1426                         Report.Error (1517, Location, "Invalid pre-processor directive");\r
1427                 }\r
1428 \r
1429                 void Error_UnexpectedDirective (string extra)\r
1430                 {\r
1431                         Report.Error (\r
1432                                 1028, Location,\r
1433                                 "Unexpected processor directive (" + extra + ")");\r
1434                 }\r
1435 \r
1436                 void Error_TokensSeen ()\r
1437                 {\r
1438                         Report.Error (\r
1439                                 1032, Location,\r
1440                                 "Cannot define or undefine pre-processor symbols after a token in the file");\r
1441                 }\r
1442                 \r
1443                 //\r
1444                 // if true, then the code continues processing the code\r
1445                 // if false, the code stays in a loop until another directive is\r
1446                 // reached.\r
1447                 //\r
1448                 bool handle_preprocessing_directive (bool caller_is_taking)\r
1449                 {\r
1450                         string cmd, arg;\r
1451                         bool region_directive = false;\r
1452 \r
1453                         get_cmd_arg (out cmd, out arg);\r
1454 \r
1455                         // Eat any trailing whitespaces and single-line comments\r
1456                         if (arg.IndexOf ("//") != -1)\r
1457                                 arg = arg.Substring (0, arg.IndexOf ("//"));\r
1458                         arg = arg.TrimEnd (' ', '\t');\r
1459 \r
1460                         //\r
1461                         // The first group of pre-processing instructions is always processed\r
1462                         //\r
1463                         switch (cmd){\r
1464                         case "pragma":\r
1465                                 if (RootContext.V2)\r
1466                                         return caller_is_taking;\r
1467                                 break;\r
1468                                 \r
1469                         case "line":\r
1470                                 if (!PreProcessLine (arg))\r
1471                                         Report.Error (\r
1472                                                 1576, Location,\r
1473                                                 "Argument to #line directive is missing or invalid");\r
1474                                 return caller_is_taking;\r
1475 \r
1476                         case "region":\r
1477                                 region_directive = true;\r
1478                                 arg = "true";\r
1479                                 goto case "if";\r
1480 \r
1481                         case "endregion":\r
1482                                 region_directive = true;\r
1483                                 goto case "endif";\r
1484                                 \r
1485                         case "if":\r
1486                                 if (arg == ""){\r
1487                                         Error_InvalidDirective ();\r
1488                                         return true;\r
1489                                 }\r
1490                                 bool taking = false;\r
1491                                 if (ifstack == null)\r
1492                                         ifstack = new Stack ();\r
1493 \r
1494                                 if (ifstack.Count == 0){\r
1495                                         taking = true;\r
1496                                 } else {\r
1497                                         int state = (int) ifstack.Peek ();\r
1498                                         if ((state & TAKING) != 0)\r
1499                                                 taking = true;\r
1500                                 }\r
1501 \r
1502                                 if (eval (arg) && taking){\r
1503                                         int push = TAKING | TAKEN_BEFORE | PARENT_TAKING;\r
1504                                         if (region_directive)\r
1505                                                 push |= REGION;\r
1506                                         ifstack.Push (push);\r
1507                                         return true;\r
1508                                 } else {\r
1509                                         int push = (taking ? PARENT_TAKING : 0);\r
1510                                         if (region_directive)\r
1511                                                 push |= REGION;\r
1512                                         ifstack.Push (push);\r
1513                                         return false;\r
1514                                 }\r
1515                                 \r
1516                         case "endif":\r
1517                                 if (ifstack == null || ifstack.Count == 0){\r
1518                                         Error_UnexpectedDirective ("no #if for this #endif");\r
1519                                         return true;\r
1520                                 } else {\r
1521                                         int pop = (int) ifstack.Pop ();\r
1522                                         \r
1523                                         if (region_directive && ((pop & REGION) == 0))\r
1524                                                 Report.Error (1027, Location, "#endif directive expected");\r
1525                                         else if (!region_directive && ((pop & REGION) != 0))\r
1526                                                 Report.Error (1038, Location, "#endregion directive expected");\r
1527                                         \r
1528                                         if (ifstack.Count == 0)\r
1529                                                 return true;\r
1530                                         else {\r
1531                                                 int state = (int) ifstack.Peek ();\r
1532 \r
1533                                                 if ((state & TAKING) != 0)\r
1534                                                         return true;\r
1535                                                 else\r
1536                                                         return false;\r
1537                                         }\r
1538                                 }\r
1539 \r
1540                         case "elif":\r
1541                                 if (ifstack == null || ifstack.Count == 0){\r
1542                                         Error_UnexpectedDirective ("no #if for this #elif");\r
1543                                         return true;\r
1544                                 } else {\r
1545                                         int state = (int) ifstack.Peek ();\r
1546 \r
1547                                         if ((state & REGION) != 0) {\r
1548                                                 Report.Error (1038, Location, "#endregion directive expected");\r
1549                                                 return true;\r
1550                                         }\r
1551 \r
1552                                         if ((state & ELSE_SEEN) != 0){\r
1553                                                 Error_UnexpectedDirective ("#elif not valid after #else");\r
1554                                                 return true;\r
1555                                         }\r
1556 \r
1557                                         if ((state & (TAKEN_BEFORE | TAKING)) != 0)\r
1558                                                 return false;\r
1559 \r
1560                                         if (eval (arg) && ((state & PARENT_TAKING) != 0)){\r
1561                                                 state = (int) ifstack.Pop ();\r
1562                                                 ifstack.Push (state | TAKING | TAKEN_BEFORE);\r
1563                                                 return true;\r
1564                                         } else \r
1565                                                 return false;\r
1566                                 }\r
1567 \r
1568                         case "else":\r
1569                                 if (ifstack == null || ifstack.Count == 0){\r
1570                                         Report.Error (\r
1571                                                 1028, Location,\r
1572                                                 "Unexpected processor directive (no #if for this #else)");\r
1573                                         return true;\r
1574                                 } else {\r
1575                                         int state = (int) ifstack.Peek ();\r
1576 \r
1577                                         if ((state & REGION) != 0) {\r
1578                                                 Report.Error (1038, Location, "#endregion directive expected");\r
1579                                                 return true;\r
1580                                         }\r
1581 \r
1582                                         if ((state & ELSE_SEEN) != 0){\r
1583                                                 Error_UnexpectedDirective ("#else within #else");\r
1584                                                 return true;\r
1585                                         }\r
1586 \r
1587                                         ifstack.Pop ();\r
1588 \r
1589                                         bool ret;\r
1590                                         if ((state & TAKEN_BEFORE) == 0){\r
1591                                                 ret = ((state & PARENT_TAKING) != 0);\r
1592                                         } else\r
1593                                                 ret = false;\r
1594                                         \r
1595                                         if (ret)\r
1596                                                 state |= TAKING;\r
1597                                         else\r
1598                                                 state &= ~TAKING;\r
1599                                         \r
1600                                         ifstack.Push (state | ELSE_SEEN);\r
1601                                         \r
1602                                         return ret;\r
1603                                 }\r
1604                         }\r
1605 \r
1606                         //\r
1607                         // These are only processed if we are in a `taking' block\r
1608                         //\r
1609                         if (!caller_is_taking)\r
1610                                 return false;\r
1611                                         \r
1612                         switch (cmd){\r
1613                         case "define":\r
1614                                 if (any_token_seen){\r
1615                                         Error_TokensSeen ();\r
1616                                         return true;\r
1617                                 }\r
1618                                 PreProcessDefinition (true, arg);\r
1619                                 return true;\r
1620 \r
1621                         case "undef":\r
1622                                 if (any_token_seen){\r
1623                                         Error_TokensSeen ();\r
1624                                         return true;\r
1625                                 }\r
1626                                 PreProcessDefinition (false, arg);\r
1627                                 return true;\r
1628 \r
1629                         case "error":\r
1630                                 Report.Error (1029, Location, "#error: '" + arg + "'");\r
1631                                 return true;\r
1632 \r
1633                         case "warning":\r
1634                                 Report.Warning (1030, Location, "#warning: '" + arg + "'");\r
1635                                 return true;\r
1636                         }\r
1637 \r
1638                         Report.Error (1024, Location, "Preprocessor directive expected (got: " + cmd + ")");\r
1639                         return true;\r
1640 \r
1641                 }\r
1642 \r
1643                 private int consume_string (bool quoted) \r
1644                 {\r
1645                         int c;\r
1646                         string_builder.Length = 0;\r
1647                                                                 \r
1648                         while ((c = getChar ()) != -1){\r
1649                                 if (c == '"'){\r
1650                                         if (quoted && peekChar () == '"'){\r
1651                                                 string_builder.Append ((char) c);\r
1652                                                 getChar ();\r
1653                                                 continue;\r
1654                                         } else {\r
1655                                                 val = string_builder.ToString ();\r
1656                                                 return Token.LITERAL_STRING;\r
1657                                         }\r
1658                                 }\r
1659 \r
1660                                 if (c == '\n'){\r
1661                                         if (!quoted)\r
1662                                                 Report.Error (1010, Location, "Newline in constant");\r
1663                                         line++;\r
1664                                         ref_line++;\r
1665                                         col = 0;\r
1666                                 } else\r
1667                                         col++;\r
1668 \r
1669                                 if (!quoted){\r
1670                                         c = escape (c);\r
1671                                         if (c == -1)\r
1672                                                 return Token.ERROR;\r
1673                                 }\r
1674                                 string_builder.Append ((char) c);\r
1675                         }\r
1676 \r
1677                         Report.Error (1039, Location, "Unterminated string literal");\r
1678                         return Token.EOF;\r
1679                 }\r
1680 \r
1681                 private int consume_identifier (int s)\r
1682                 {\r
1683                         int res = consume_identifier (s, false);\r
1684 \r
1685                         if (res == Token.PARTIAL) {\r
1686                                 // Save current position and parse next token.\r
1687                                 int old = reader.Position;\r
1688                                 int old_putback = putback_char;\r
1689 \r
1690                                 putback_char = -1;\r
1691 \r
1692                                 int next_token = token ();\r
1693                                 bool ok = (next_token == Token.CLASS) ||\r
1694                                         (next_token == Token.STRUCT) ||\r
1695                                         (next_token == Token.INTERFACE);\r
1696 \r
1697                                 reader.Position = old;\r
1698                                 putback_char = old_putback;\r
1699 \r
1700                                 if (ok)\r
1701                                         return res;\r
1702                                 else {\r
1703                                         val = "partial";\r
1704                                         return Token.IDENTIFIER;\r
1705                                 }\r
1706                         }\r
1707 \r
1708                         return res;\r
1709                 }\r
1710 \r
1711                 private int consume_identifier (int s, bool quoted) \r
1712                 {\r
1713                         int pos = 1;\r
1714                         int c;\r
1715                         \r
1716                         id_builder [0] = (char) s;\r
1717 \r
1718                         while ((c = reader.Read ()) != -1) {\r
1719                                 if (is_identifier_part_character ((char) c)){\r
1720                                         if (pos == max_id_size){\r
1721                                                 Report.Error (645, Location, "Identifier too long (limit is 512 chars)");\r
1722                                                 return Token.ERROR;\r
1723                                         }\r
1724                                         \r
1725                                         id_builder [pos++] = (char) c;\r
1726                                         putback_char = -1;\r
1727                                         col++;\r
1728                                 } else {\r
1729                                         putback_char = c;\r
1730                                         break;\r
1731                                 }\r
1732                         }\r
1733 \r
1734                         //\r
1735                         // Optimization: avoids doing the keyword lookup\r
1736                         // on uppercase letters and _\r
1737                         //\r
1738                         if (!quoted && (s >= 'a' || s == '_')){\r
1739                                 int keyword = GetKeyword (id_builder, pos);\r
1740                                 if (keyword != -1)\r
1741                                         return keyword;\r
1742                         }\r
1743 \r
1744                         //\r
1745                         // Keep identifiers in an array of hashtables to avoid needless\r
1746                         // allocations\r
1747                         //\r
1748 \r
1749                         if (identifiers [pos] != null) {\r
1750                                 val = identifiers [pos][id_builder];\r
1751                                 if (val != null) {\r
1752                                         return Token.IDENTIFIER;\r
1753                                 }\r
1754                         }\r
1755                         else\r
1756                                 identifiers [pos] = new CharArrayHashtable (pos);\r
1757 \r
1758                         val = new String (id_builder, 0, pos);\r
1759 \r
1760                         char [] chars = new char [pos];\r
1761                         Array.Copy (id_builder, chars, pos);\r
1762 \r
1763                         identifiers [pos] [chars] = val;\r
1764 \r
1765                         return Token.IDENTIFIER;\r
1766                 }\r
1767                 \r
1768                 public int xtoken ()\r
1769                 {\r
1770                         int t;\r
1771                         bool doread = false;\r
1772                         int c;\r
1773 \r
1774                         val = null;\r
1775                         // optimization: eliminate col and implement #directive semantic correctly.\r
1776                         for (;(c = getChar ()) != -1; col++) {\r
1777                                 if (c == ' ')\r
1778                                         continue;\r
1779                                 \r
1780                                 if (c == '\t') {\r
1781                                         col = (((col + 8) / 8) * 8) - 1;\r
1782                                         continue;\r
1783                                 }\r
1784                                 \r
1785                                 if (c == ' ' || c == '\f' || c == '\v' || c == 0xa0)\r
1786                                         continue;\r
1787 \r
1788                                 if (c == '\r') {\r
1789                                         if (peekChar () == '\n')\r
1790                                                 getChar ();\r
1791 \r
1792                                         line++;\r
1793                                         ref_line++;\r
1794                                         col = 0;\r
1795                                         any_token_seen |= tokens_seen;\r
1796                                         tokens_seen = false;\r
1797                                         continue;\r
1798                                 }\r
1799 \r
1800                                 // Handle double-slash comments.\r
1801                                 if (c == '/'){\r
1802                                         int d = peekChar ();\r
1803                                 \r
1804                                         if (d == '/'){\r
1805                                                 getChar ();\r
1806                                                 while ((d = getChar ()) != -1 && (d != '\n') && d != '\r')\r
1807                                                         col++;\r
1808                                                 if (d == '\n'){\r
1809                                                         line++;\r
1810                                                         ref_line++;\r
1811                                                         col = 0;\r
1812                                                 }\r
1813                                                 any_token_seen |= tokens_seen;\r
1814                                                 tokens_seen = false;\r
1815                                                 continue;\r
1816                                         } else if (d == '*'){\r
1817                                                 getChar ();\r
1818 \r
1819                                                 while ((d = getChar ()) != -1){\r
1820                                                         if (d == '*' && peekChar () == '/'){\r
1821                                                                 getChar ();\r
1822                                                                 col++;\r
1823                                                                 break;\r
1824                                                         }\r
1825                                                         if (d == '\n'){\r
1826                                                                 line++;\r
1827                                                                 ref_line++;\r
1828                                                                 col = 0;\r
1829                                                                 any_token_seen |= tokens_seen;\r
1830                                                                 tokens_seen = false;\r
1831                                                         }\r
1832                                                 }\r
1833                                                 continue;\r
1834                                         }\r
1835                                         goto is_punct_label;\r
1836                                 }\r
1837 \r
1838                                 \r
1839                                 if (is_identifier_start_character ((char)c)){\r
1840                                         tokens_seen = true;\r
1841                                         return consume_identifier (c);\r
1842                                 }\r
1843 \r
1844                         is_punct_label:\r
1845                                 if ((t = is_punct ((char)c, ref doread)) != Token.ERROR){\r
1846                                         tokens_seen = true;\r
1847                                         if (doread){\r
1848                                                 getChar ();\r
1849                                                 col++;\r
1850                                         }\r
1851                                         return t;\r
1852                                 }\r
1853 \r
1854                                 // white space\r
1855                                 if (c == '\n'){\r
1856                                         line++;\r
1857                                         ref_line++;\r
1858                                         col = 0;\r
1859                                         any_token_seen |= tokens_seen;\r
1860                                         tokens_seen = false;\r
1861                                         continue;\r
1862                                 }\r
1863 \r
1864                                 if (c >= '0' && c <= '9'){\r
1865                                         tokens_seen = true;\r
1866                                         return is_number (c);\r
1867                                 }\r
1868 \r
1869                                 if (c == '.'){\r
1870                                         tokens_seen = true;\r
1871                                         int peek = peekChar ();\r
1872                                         if (peek >= '0' && peek <= '9')\r
1873                                                 return is_number (c);\r
1874                                         return Token.DOT;\r
1875                                 }\r
1876                                 \r
1877                                 /* For now, ignore pre-processor commands */\r
1878                                 // FIXME: In C# the '#' is not limited to appear\r
1879                                 // on the first column.\r
1880                                 if (c == '#' && !tokens_seen){\r
1881                                         bool cont = true;\r
1882                                         \r
1883                                 start_again:\r
1884                                         \r
1885                                         cont = handle_preprocessing_directive (cont);\r
1886 \r
1887                                         if (cont){\r
1888                                                 col = 0;\r
1889                                                 continue;\r
1890                                         }\r
1891                                         col = 1;\r
1892 \r
1893                                         bool skipping = false;\r
1894                                         for (;(c = getChar ()) != -1; col++){\r
1895                                                 if (c == '\n'){\r
1896                                                         col = 0;\r
1897                                                         line++;\r
1898                                                         ref_line++;\r
1899                                                         skipping = false;\r
1900                                                 } else if (c == ' ' || c == '\t' || c == '\v' || c == '\r' || c == 0xa0)\r
1901                                                         continue;\r
1902                                                 else if (c != '#')\r
1903                                                         skipping = true;\r
1904                                                 if (c == '#' && !skipping)\r
1905                                                         goto start_again;\r
1906                                         }\r
1907                                         any_token_seen |= tokens_seen;\r
1908                                         tokens_seen = false;\r
1909                                         if (c == -1)\r
1910                                                 Report.Error (1027, Location, "#endif/#endregion expected");\r
1911                                         continue;\r
1912                                 }\r
1913                                 \r
1914                                 if (c == '"') \r
1915                                         return consume_string (false);\r
1916 \r
1917                                 if (c == '\''){\r
1918                                         c = getChar ();\r
1919                                         tokens_seen = true;\r
1920                                         if (c == '\''){\r
1921                                                 error_details = "Empty character literal";\r
1922                                                 Report.Error (1011, Location, error_details);\r
1923                                                 return Token.ERROR;\r
1924                                         }\r
1925                                         c = escape (c);\r
1926                                         if (c == -1)\r
1927                                                 return Token.ERROR;\r
1928                                         val = new System.Char ();\r
1929                                         val = (char) c;\r
1930                                         c = getChar ();\r
1931 \r
1932                                         if (c != '\''){\r
1933                                                 error_details = "Too many characters in character literal";\r
1934                                                 Report.Error (1012, Location, error_details);\r
1935 \r
1936                                                 // Try to recover, read until newline or next "'"\r
1937                                                 while ((c = getChar ()) != -1){\r
1938                                                         if (c == '\n' || c == '\''){\r
1939                                                                 line++;\r
1940                                                                 ref_line++;\r
1941                                                                 col = 0;\r
1942                                                                 break;\r
1943                                                         } else\r
1944                                                                 col++;\r
1945                                                         \r
1946                                                 }\r
1947                                                 return Token.ERROR;\r
1948                                         }\r
1949                                         return Token.LITERAL_CHARACTER;\r
1950                                 }\r
1951                                 \r
1952                                 if (c == '@') {\r
1953                                         c = getChar ();\r
1954                                         if (c == '"') {\r
1955                                                 tokens_seen = true;\r
1956                                                 return consume_string (true);\r
1957                                         } else if (is_identifier_start_character ((char) c)){\r
1958                                                 return consume_identifier (c, true);\r
1959                                         } else {\r
1960                                                 Report.Error (1033, Location, "'@' must be followed by string constant or identifier");\r
1961                                         }\r
1962                                 }\r
1963 \r
1964                                 if (c == '#') {\r
1965                                         error_details = "Preprocessor directives must appear as the first non-whitespace " +\r
1966                                                 "character on a line.";\r
1967 \r
1968                                         Report.Error (1040, Location, error_details);\r
1969 \r
1970                                         return Token.ERROR;\r
1971                                 }\r
1972 \r
1973                                 error_details = ((char)c).ToString ();\r
1974                                 \r
1975                                 return Token.ERROR;\r
1976                         }\r
1977 \r
1978                         return Token.EOF;\r
1979                 }\r
1980 \r
1981                 public void cleanup ()\r
1982                 {\r
1983                         if (ifstack != null && ifstack.Count >= 1) {\r
1984                                 int state = (int) ifstack.Pop ();\r
1985                                 if ((state & REGION) != 0)\r
1986                                         Report.Error (1038, "#endregion directive expected");\r
1987                                 else \r
1988                                         Report.Error (1027, "#endif directive expected");\r
1989                         }\r
1990                                 \r
1991                 }\r
1992         }\r
1993 }\r
1994 \r