mcs/mcs/cs-tokenizer.cs

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