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