glib/gscanner.c

   1 /* GLIB - Library of useful routines for C programming
   2  * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * GScanner: Flexible lexical scanner for general purpose.
   5  * Copyright (C) 1997, 1998 Tim Janik
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Library General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Library General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Library General Public
  18  * License along with this library; if not, write to the
  19  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20  * Boston, MA 02111-1307, USA.
  21  */
  22 #define         __gscanner_c__
  23
  24 #include        <stdlib.h>
  25 #include        <stdarg.h>
  26 #include        <string.h>
  27 #include        <stdio.h>
  28 #include        <unistd.h>
  29 #include        <errno.h>
  30 #include        <sys/types.h>   /* needed for sys/stat.h */
  31 #include        <sys/stat.h>
  32 #include        "glib.h"
  33
  34
  35
  36 /* --- defines --- */
  37 #define to_lower(c)                             ( \
  38         (guchar) (                                                      \
  39           ( (((guchar)(c))>='A' && ((guchar)(c))<='Z') * ('a'-'A') ) |  \
  40           ( (((guchar)(c))>=192 && ((guchar)(c))<=214) * (224-192) ) |  \
  41           ( (((guchar)(c))>=216 && ((guchar)(c))<=222) * (248-216) ) |  \
  42           ((guchar)(c))                                                 \
  43         )                                                               \
  44 )
  45
  46
  47 /* --- typedefs --- */
  48 typedef struct  _GScannerKey    GScannerKey;
  49
  50 struct  _GScannerKey
  51 {
  52   guint          scope_id;
  53   gchar         *symbol;
  54   gpointer       value;
  55 };
  56
  57
  58
  59 /* --- variables --- */
  60 static  GScannerConfig  g_scanner_config_template =
  61 {
  62   (
  63    " \t\n"
  64    )                    /* cset_skip_characters */,
  65   (
  66    G_CSET_a_2_z
  67    "_"
  68    G_CSET_A_2_Z
  69    )                    /* cset_identifier_first */,
  70   (
  71    G_CSET_a_2_z
  72    "_0123456789"
  73    G_CSET_A_2_Z
  74    G_CSET_LATINS
  75    G_CSET_LATINC
  76    )                    /* cset_identifier_nth */,
  77   ( "#\n" )             /* cpair_comment_single */,
  78
  79   FALSE                 /* case_sensitive */,
  80
  81   TRUE                  /* skip_comment_multi */,
  82   TRUE                  /* skip_comment_single */,
  83   TRUE                  /* scan_comment_multi */,
  84   TRUE                  /* scan_identifier */,
  85   FALSE                 /* scan_identifier_1char */,
  86   FALSE                 /* scan_identifier_NULL */,
  87   TRUE                  /* scan_symbols */,
  88   FALSE                 /* scan_binary */,
  89   TRUE                  /* scan_octal */,
  90   TRUE                  /* scan_float */,
  91   TRUE                  /* scan_hex */,
  92   FALSE                 /* scan_hex_dollar */,
  93   TRUE                  /* scan_string_sq */,
  94   TRUE                  /* scan_string_dq */,
  95   TRUE                  /* numbers_2_int */,
  96   FALSE                 /* int_2_float */,
  97   FALSE                 /* identifier_2_string */,
  98   TRUE                  /* char_2_token */,
  99   FALSE                 /* symbol_2_token */,
 100   FALSE                 /* scope_0_fallback */,
 101 };
 102
 103
 104 /* --- prototypes --- */
 105 extern char* g_vsprintf (gchar *fmt, va_list *args, va_list *args2);
 106 static inline
 107 gint            g_scanner_char_2_num      (guchar        c,
 108                                            guchar        base);
 109 static inline
 110 GScannerKey*    g_scanner_lookup_internal (GScanner     *scanner,
 111                                            guint         scope_id,
 112                                            const gchar  *symbol);
 113 static gint     g_scanner_key_equal       (gconstpointer v1,
 114                                            gconstpointer v2);
 115 static guint    g_scanner_key_hash        (gconstpointer v);
 116 static void     g_scanner_get_token_ll    (GScanner     *scanner,
 117                                            GTokenType   *token_p,
 118                                            GValue       *value_p,
 119                                            guint        *line_p,
 120                                            guint        *position_p);
 121 static void     g_scanner_get_token_i     (GScanner     *scanner,
 122                                            GTokenType   *token_p,
 123                                            GValue       *value_p,
 124                                            guint        *line_p,
 125                                            guint        *position_p);
 126 static void     g_scanner_free_value      (GTokenType   *token_p,
 127                                            GValue       *value_p);
 128
 129 static guchar   g_scanner_peek_next_char  (GScanner     *scanner);
 130 static guchar   g_scanner_get_char        (GScanner     *scanner,
 131                                            guint        *line_p,
 132                                            guint        *position_p);
 133 static void     g_scanner_msg_handler     (GScanner     *scanner,
 134                                            gchar        *message,
 135                                            gint          is_error);
 136
 137
 138 /* --- functions --- */
 139 static gint
 140 g_scanner_char_2_num (guchar    c,
 141                       guchar    base)
 142 {
 143   if (c >= '0' && c <= '9')
 144     c -= '0';
 145   else if (c >= 'A' && c <= 'Z')
 146     c -= 'A' - 10;
 147   else if (c >= 'a' && c <= 'z')
 148     c -= 'a' - 10;
 149   else
 150     return -1;
 151
 152   if (c < base)
 153     return c;
 154
 155   return -1;
 156 }
 157
 158 GScanner*
 159 g_scanner_new (GScannerConfig   *config_templ)
 160 {
 161   register GScanner     *scanner;
 162
 163   if (!config_templ)
 164     config_templ = &g_scanner_config_template;
 165
 166   scanner = g_new0 (GScanner, 1);
 167
 168   scanner->user_data = NULL;
 169   scanner->max_parse_errors = 0;
 170   scanner->parse_errors = 0;
 171   scanner->input_name = NULL;
 172   scanner->derived_data = NULL;
 173
 174   scanner->config = g_new0 (GScannerConfig, 1);
 175
 176   scanner->config->case_sensitive       = config_templ->case_sensitive;
 177   scanner->config->cset_skip_characters = config_templ->cset_skip_characters;
 178   scanner->config->cset_identifier_first= config_templ->cset_identifier_first;
 179   scanner->config->cset_identifier_nth  = config_templ->cset_identifier_nth;
 180   scanner->config->cpair_comment_single = config_templ->cpair_comment_single;
 181   scanner->config->skip_comment_multi   = config_templ->skip_comment_multi;
 182   scanner->config->skip_comment_single  = config_templ->skip_comment_single;
 183   scanner->config->scan_comment_multi   = config_templ->scan_comment_multi;
 184   scanner->config->scan_identifier      = config_templ->scan_identifier;
 185   scanner->config->scan_identifier_1char= config_templ->scan_identifier_1char;
 186   scanner->config->scan_identifier_NULL = config_templ->scan_identifier_NULL;
 187   scanner->config->scan_symbols         = config_templ->scan_symbols;
 188   scanner->config->scan_binary          = config_templ->scan_binary;
 189   scanner->config->scan_octal           = config_templ->scan_octal;
 190   scanner->config->scan_float           = config_templ->scan_float;
 191   scanner->config->scan_hex             = config_templ->scan_hex;
 192   scanner->config->scan_hex_dollar      = config_templ->scan_hex_dollar;
 193   scanner->config->scan_string_sq       = config_templ->scan_string_sq;
 194   scanner->config->scan_string_dq       = config_templ->scan_string_dq;
 195   scanner->config->numbers_2_int        = config_templ->numbers_2_int;
 196   scanner->config->int_2_float          = config_templ->int_2_float;
 197   scanner->config->identifier_2_string  = config_templ->identifier_2_string;
 198   scanner->config->char_2_token         = config_templ->char_2_token;
 199   scanner->config->symbol_2_token       = config_templ->symbol_2_token;
 200   scanner->config->scope_0_fallback     = config_templ->scope_0_fallback;
 201
 202   scanner->token = G_TOKEN_NONE;
 203   scanner->value.v_int = 0;
 204   scanner->line = 1;
 205   scanner->position = 0;
 206
 207   scanner->next_token = G_TOKEN_NONE;
 208   scanner->next_value.v_int = 0;
 209   scanner->next_line = 1;
 210   scanner->next_position = 0;
 211
 212   scanner->symbol_table = g_hash_table_new (g_scanner_key_hash, g_scanner_key_equal);
 213   scanner->text = NULL;
 214   scanner->text_len = 0;
 215   scanner->input_fd = -1;
 216   scanner->peeked_char = -1;
 217   scanner->scope_id = 0;
 218
 219   scanner->msg_handler = g_scanner_msg_handler;
 220
 221   return scanner;
 222 }
 223
 224 static void
 225 g_scanner_destroy_symbol_table_entry (gpointer _key,
 226                                       gpointer _value,
 227                                       gpointer _data)
 228 {
 229   GScannerKey *key = _key;
 230
 231   g_free (key->symbol);
 232   g_free (key);
 233 }
 234
 235 void
 236 g_scanner_destroy (GScanner     *scanner)
 237 {
 238   g_return_if_fail (scanner != NULL);
 239
 240   g_hash_table_foreach (scanner->symbol_table,
 241                         g_scanner_destroy_symbol_table_entry, NULL);
 242   g_hash_table_destroy (scanner->symbol_table);
 243   g_scanner_free_value (&scanner->token, &scanner->value);
 244   g_scanner_free_value (&scanner->next_token, &scanner->next_value);
 245   g_free (scanner->config);
 246   g_free (scanner);
 247 }
 248
 249 static void
 250 g_scanner_msg_handler (GScanner         *scanner,
 251                        gchar            *message,
 252                        gint              is_error)
 253 {
 254   g_return_if_fail (scanner != NULL);
 255
 256   fprintf (stdout, "%s:%d: ", scanner->input_name, scanner->line);
 257   if (is_error)
 258     fprintf (stdout, "error: ");
 259   fprintf (stdout, "%s\n", message);
 260 }
 261
 262 void
 263 g_scanner_error (GScanner       *scanner,
 264                  const gchar    *format,
 265                  ...)
 266 {
 267   g_return_if_fail (scanner != NULL);
 268   g_return_if_fail (format != NULL);
 269
 270   scanner->parse_errors++;
 271
 272   if (scanner->msg_handler)
 273     {
 274       va_list args, args2;
 275       gchar *string;
 276
 277       va_start (args, format);
 278       va_start (args2, format);
 279       string = g_vsprintf ((gchar*) format, &args, &args2);
 280       va_end (args);
 281       va_end (args2);
 282
 283       string = g_strdup (string);
 284
 285       scanner->msg_handler (scanner, string, TRUE);
 286
 287       g_free (string);
 288     }
 289 }
 290
 291 void
 292 g_scanner_warn (GScanner       *scanner,
 293                 const gchar    *format,
 294                 ...)
 295 {
 296   g_return_if_fail (scanner != NULL);
 297   g_return_if_fail (format != NULL);
 298
 299   if (scanner->msg_handler)
 300     {
 301       va_list args, args2;
 302       gchar *string;
 303
 304       va_start (args, format);
 305       va_start (args2, format);
 306       string = g_vsprintf ((gchar*) format, &args, &args2);
 307       va_end (args);
 308       va_end (args2);
 309
 310       string = g_strdup (string);
 311
 312       scanner->msg_handler (scanner, string, FALSE);
 313
 314       g_free (string);
 315     }
 316 }
 317
 318 void
 319 g_scanner_input_file (GScanner  *scanner,
 320                       gint      input_fd)
 321 {
 322   g_return_if_fail (input_fd >= 0);
 323
 324   scanner->token = G_TOKEN_NONE;
 325   scanner->value.v_int = 0;
 326   scanner->line = 1;
 327   scanner->position = 0;
 328   scanner->next_token = G_TOKEN_NONE;
 329
 330   scanner->text = NULL;
 331   scanner->text_len = 0;
 332   scanner->input_fd = input_fd;
 333   scanner->peeked_char = -1;
 334 }
 335
 336 void
 337 g_scanner_input_text (GScanner       *scanner,
 338                       const  gchar   *text,
 339                       guint           text_len)
 340 {
 341   g_return_if_fail (text != NULL);
 342
 343   scanner->token = G_TOKEN_NONE;
 344   scanner->value.v_int = 0;
 345   scanner->line = 1;
 346   scanner->position = 0;
 347   scanner->next_token = G_TOKEN_NONE;
 348
 349   scanner->text = text;
 350   scanner->text_len = text_len;
 351   scanner->input_fd = -1;
 352   scanner->peeked_char = -1;
 353 }
 354
 355 static gint
 356 g_scanner_key_equal (gconstpointer v1,
 357                      gconstpointer v2)
 358 {
 359   register const GScannerKey *key1 = v1;
 360   register const GScannerKey *key2 = v2;
 361
 362   return (key1->scope_id == key2->scope_id) && (strcmp (key1->symbol, key2->symbol) == 0);
 363 }
 364
 365 static guint
 366 g_scanner_key_hash (gconstpointer v)
 367 {
 368   register const GScannerKey *key = v;
 369   register gchar *c;
 370   register guint h;
 371
 372   h = key->scope_id;
 373   for (c = key->symbol; *c; c++)
 374     {
 375       register guint g;
 376
 377       h = (h << 4) + *c;
 378       g = h & 0xf0000000;
 379       if (g)
 380         {
 381           h = h ^ (g >> 24);
 382           h = h ^ g;
 383         }
 384     }
 385
 386   return h;
 387 }
 388
 389 static inline GScannerKey*
 390 g_scanner_lookup_internal (GScanner     *scanner,
 391                            guint         scope_id,
 392                            const gchar  *symbol)
 393 {
 394   register GScannerKey  *key_p;
 395   GScannerKey key;
 396
 397   key.scope_id = scope_id;
 398
 399   if (!scanner->config->case_sensitive)
 400     {
 401       register gchar *d;
 402       register const gchar *c;
 403
 404       key.symbol = g_new (gchar, strlen (symbol) + 1);
 405       for (d = key.symbol, c = symbol; *c; c++, d++)
 406         *d = to_lower (*c);
 407       *d = 0;
 408       key_p = g_hash_table_lookup (scanner->symbol_table, &key);
 409       g_free (key.symbol);
 410     }
 411   else
 412     {
 413       key.symbol = (gchar*) symbol;
 414       key_p = g_hash_table_lookup (scanner->symbol_table, &key);
 415     }
 416
 417   return key_p;
 418 }
 419
 420 void
 421 g_scanner_scope_add_symbol (GScanner    *scanner,
 422                             guint        scope_id,
 423                             const gchar *symbol,
 424                             gpointer     value)
 425 {
 426   register GScannerKey  *key;
 427
 428   g_return_if_fail (scanner != NULL);
 429   g_return_if_fail (symbol != NULL);
 430
 431   key = g_scanner_lookup_internal (scanner, scope_id, symbol);
 432
 433   if (!key)
 434     {
 435       key = g_new (GScannerKey, 1);
 436       key->scope_id = scope_id;
 437       key->symbol = g_strdup (symbol);
 438       key->value = value;
 439       if (!scanner->config->case_sensitive)
 440         {
 441           register gchar *c;
 442
 443           c = key->symbol;
 444           while (*c != 0)
 445             {
 446               *c = to_lower (*c);
 447               c++;
 448             }
 449         }
 450       g_hash_table_insert (scanner->symbol_table, key, key);
 451     }
 452   else
 453     key->value = value;
 454 }
 455
 456 void
 457 g_scanner_scope_remove_symbol (GScanner    *scanner,
 458                                guint        scope_id,
 459                                const gchar *symbol)
 460 {
 461   register GScannerKey  *key;
 462
 463   g_return_if_fail (scanner != NULL);
 464   g_return_if_fail (symbol != NULL);
 465
 466   key = g_scanner_lookup_internal (scanner, scope_id, symbol);
 467
 468   if (key)
 469     {
 470       g_hash_table_remove (scanner->symbol_table, key);
 471       g_free (key->symbol);
 472       g_free (key);
 473     }
 474 }
 475
 476 gpointer
 477 g_scanner_lookup_symbol (GScanner       *scanner,
 478                          const gchar    *symbol)
 479 {
 480   register GScannerKey  *key;
 481   register guint scope_id;
 482
 483   g_return_val_if_fail (scanner != NULL, NULL);
 484
 485   if (!symbol)
 486     return NULL;
 487
 488   scope_id = scanner->scope_id;
 489   key = g_scanner_lookup_internal (scanner, scope_id, symbol);
 490   if (!key && scope_id && scanner->config->scope_0_fallback)
 491     key = g_scanner_lookup_internal (scanner, 0, symbol);
 492
 493   if (key)
 494     return key->value;
 495   else
 496     return NULL;
 497 }
 498
 499 gpointer
 500 g_scanner_scope_lookup_symbol (GScanner       *scanner,
 501                                guint           scope_id,
 502                                const gchar    *symbol)
 503 {
 504   register GScannerKey  *key;
 505
 506   g_return_val_if_fail (scanner != NULL, NULL);
 507
 508   if (!symbol)
 509     return NULL;
 510
 511   key = g_scanner_lookup_internal (scanner, scope_id, symbol);
 512
 513   if (key)
 514     return key->value;
 515   else
 516     return NULL;
 517 }
 518
 519 guint
 520 g_scanner_set_scope (GScanner       *scanner,
 521                      guint           scope_id)
 522 {
 523   register guint old_scope_id;
 524
 525   g_return_val_if_fail (scanner != NULL, 0);
 526
 527   old_scope_id = scanner->scope_id;
 528   scanner->scope_id = scope_id;
 529
 530   return old_scope_id;
 531 }
 532
 533 static void
 534 g_scanner_foreach_internal (gpointer  _key,
 535                             gpointer  _value,
 536                             gpointer  _user_data)
 537 {
 538   register GScannerKey *key;
 539   register gpointer *d;
 540   register GHFunc func;
 541   register gpointer func_data;
 542   register guint *scope_id;
 543
 544   d = _user_data;
 545   func = (GHFunc) d[0];
 546   func_data = d[1];
 547   scope_id = d[2];
 548   key = _value;
 549
 550   if (key->scope_id == *scope_id)
 551     func (key->symbol, key->value, func_data);
 552 }
 553
 554 void
 555 g_scanner_scope_foreach_symbol (GScanner       *scanner,
 556                                 guint           scope_id,
 557                                 GHFunc          func,
 558                                 gpointer        func_data)
 559 {
 560   gpointer d[3];
 561
 562   g_return_if_fail (scanner != NULL);
 563
 564   d[0] = (gpointer) func;
 565   d[1] = func_data;
 566   d[2] = &scope_id;
 567
 568   g_hash_table_foreach (scanner->symbol_table, g_scanner_foreach_internal, d);
 569 }
 570
 571 void
 572 g_scanner_freeze_symbol_table (GScanner *scanner)
 573 {
 574   g_return_if_fail (scanner != NULL);
 575
 576   g_hash_table_freeze (scanner->symbol_table);
 577 }
 578
 579 void
 580 g_scanner_thaw_symbol_table (GScanner *scanner)
 581 {
 582   g_return_if_fail (scanner != NULL);
 583
 584   g_hash_table_thaw (scanner->symbol_table);
 585 }
 586
 587 GTokenType
 588 g_scanner_peek_next_token (GScanner     *scanner)
 589 {
 590   g_return_val_if_fail (scanner != NULL, G_TOKEN_EOF);
 591
 592   if (scanner->next_token == G_TOKEN_NONE)
 593     {
 594       scanner->next_line = scanner->line;
 595       scanner->next_position = scanner->position;
 596       g_scanner_get_token_i (scanner,
 597                              &scanner->next_token,
 598                              &scanner->next_value,
 599                              &scanner->next_line,
 600                              &scanner->next_position);
 601     }
 602
 603   return scanner->next_token;
 604 }
 605
 606 GTokenType
 607 g_scanner_get_next_token (GScanner      *scanner)
 608 {
 609   g_return_val_if_fail (scanner != NULL, G_TOKEN_EOF);
 610
 611   if (scanner->next_token != G_TOKEN_NONE)
 612     {
 613       g_scanner_free_value (&scanner->token, &scanner->value);
 614
 615       scanner->token = scanner->next_token;
 616       scanner->value = scanner->next_value;
 617       scanner->line = scanner->next_line;
 618       scanner->position = scanner->next_position;
 619       scanner->next_token = G_TOKEN_NONE;
 620     }
 621   else
 622     g_scanner_get_token_i (scanner,
 623                            &scanner->token,
 624                            &scanner->value,
 625                            &scanner->line,
 626                            &scanner->position);
 627
 628   return scanner->token;
 629 }
 630
 631 GTokenType
 632 g_scanner_cur_token (GScanner *scanner)
 633 {
 634   g_return_val_if_fail (scanner != NULL, G_TOKEN_EOF);
 635
 636   return scanner->token;
 637 }
 638
 639 GValue
 640 g_scanner_cur_value (GScanner *scanner)
 641 {
 642   register GValue v;
 643
 644   v.v_int = 0;
 645   g_return_val_if_fail (scanner != NULL, v);
 646
 647   return scanner->value;
 648 }
 649
 650 guint
 651 g_scanner_cur_line (GScanner *scanner)
 652 {
 653   g_return_val_if_fail (scanner != NULL, 0);
 654
 655   return scanner->line;
 656 }
 657
 658 guint
 659 g_scanner_cur_position (GScanner *scanner)
 660 {
 661   g_return_val_if_fail (scanner != NULL, 0);
 662
 663   return scanner->position;
 664 }
 665
 666 gboolean
 667 g_scanner_eof (GScanner *scanner)
 668 {
 669   g_return_val_if_fail (scanner != NULL, TRUE);
 670
 671   return scanner->token == G_TOKEN_EOF;
 672 }
 673
 674 static guchar
 675 g_scanner_peek_next_char (GScanner *scanner)
 676 {
 677   guchar fchar;
 678
 679   if (scanner->text_len)
 680     {
 681       fchar = scanner->text[0];
 682     }
 683   else if (scanner->input_fd >= 0)
 684     {
 685       if (scanner->peeked_char < 0)
 686         {
 687           register gint count;
 688
 689           do
 690             {
 691               count = read (scanner->input_fd, &fchar, 1);
 692             }
 693           while (count == -1 &&
 694                  (errno == EINTR ||
 695                   errno == EAGAIN));
 696
 697           if (count != 1)
 698             fchar = 0;
 699
 700           scanner->peeked_char = fchar;
 701         }
 702       else
 703         fchar = scanner->peeked_char;
 704     }
 705   else
 706     fchar = 0;
 707
 708   return fchar;
 709 }
 710
 711 static guchar
 712 g_scanner_get_char (GScanner    *scanner,
 713                     guint       *line_p,
 714                     guint       *position_p)
 715 {
 716   guchar fchar;
 717
 718   if (scanner->text_len)
 719     {
 720       fchar = *(scanner->text++);
 721       scanner->text_len--;
 722     }
 723   else if (scanner->input_fd >= 0)
 724     {
 725       if (scanner->peeked_char < 0)
 726         {
 727           register gint count;
 728
 729           do
 730             {
 731               count = read (scanner->input_fd, &fchar, 1);
 732             }
 733           while (count == -1 &&
 734                  (errno == EINTR ||
 735                   errno == EAGAIN));
 736           if (count != 1 || fchar == 0)
 737             {
 738               fchar = 0;
 739               scanner->peeked_char = 0;
 740             }
 741         }
 742       else
 743         {
 744           fchar = scanner->peeked_char;
 745           if (fchar)
 746             scanner->peeked_char = -1;
 747         }
 748     }
 749   else
 750     fchar = 0;
 751
 752   if (fchar == '\n')
 753     {
 754       (*position_p) = 0;
 755       (*line_p)++;
 756     }
 757   else if (fchar)
 758     {
 759       (*position_p)++;
 760     }
 761
 762   return fchar;
 763 }
 764
 765 void
 766 g_scanner_unexp_token (GScanner         *scanner,
 767                        GTokenType        expected_token,
 768                        const gchar      *identifier_spec,
 769                        const gchar      *symbol_spec,
 770                        const gchar      *symbol_name,
 771                        const gchar      *message,
 772                        gint              is_error)
 773 {
 774   register gchar        *token_string;
 775   register guint        token_string_len;
 776   register gchar        *expected_string;
 777   register guint        expected_string_len;
 778   register gchar        *message_prefix;
 779   register gboolean     print_unexp;
 780   void (*msg_handler)   (GScanner*, const gchar*, ...);
 781
 782   g_return_if_fail (scanner != NULL);
 783
 784   if (is_error)
 785     msg_handler = g_scanner_error;
 786   else
 787     msg_handler = g_scanner_warn;
 788
 789   if (!identifier_spec)
 790     identifier_spec = "identifier";
 791   if (!symbol_spec)
 792     symbol_spec = "symbol";
 793
 794   token_string_len = 56;
 795   token_string = g_new (gchar, token_string_len + 1);
 796   expected_string_len = 64;
 797   expected_string = g_new (gchar, expected_string_len + 1);
 798   print_unexp = TRUE;
 799
 800   switch (scanner->token)
 801     {
 802     case  G_TOKEN_EOF:
 803       g_snprintf (token_string, token_string_len, "end of file");
 804       break;
 805
 806     default:
 807       if (scanner->token >= 1 && scanner->token <= 255)
 808         {
 809           if ((scanner->token >= ' ' && scanner->token <= '~') ||
 810               strchr (scanner->config->cset_identifier_first, scanner->token) ||
 811               strchr (scanner->config->cset_identifier_nth, scanner->token))
 812             g_snprintf (token_string, expected_string_len, "character `%c'", scanner->token);
 813           else
 814             g_snprintf (token_string, expected_string_len, "character `\\%o'", scanner->token);
 815           break;
 816         }
 817       else if (!scanner->config->symbol_2_token)
 818         {
 819           g_snprintf (token_string, token_string_len, "(unknown) token <%d>", scanner->token);
 820           break;
 821         }
 822       /* fall through */
 823     case  G_TOKEN_SYMBOL:
 824       if (expected_token == G_TOKEN_SYMBOL ||
 825           (scanner->config->symbol_2_token &&
 826            expected_token > G_TOKEN_LAST))
 827         print_unexp = FALSE;
 828       if (symbol_name)
 829         g_snprintf (token_string,
 830                     token_string_len,
 831                     "%s%s `%s'",
 832                     print_unexp ? "" : "invalid ",
 833                     symbol_spec,
 834                     symbol_name);
 835       else
 836         g_snprintf (token_string,
 837                     token_string_len,
 838                     "%s%s",
 839                     print_unexp ? "" : "invalid ",
 840                     symbol_spec);
 841       break;
 842
 843     case  G_TOKEN_ERROR:
 844       print_unexp = FALSE;
 845       expected_token = G_TOKEN_NONE;
 846       switch (scanner->value.v_error)
 847         {
 848         case  G_ERR_UNEXP_EOF:
 849           g_snprintf (token_string, token_string_len, "scanner: unexpected end of file");
 850           break;
 851
 852         case  G_ERR_UNEXP_EOF_IN_STRING:
 853           g_snprintf (token_string, token_string_len, "scanner: unterminated string constant");
 854           break;
 855
 856         case  G_ERR_UNEXP_EOF_IN_COMMENT:
 857           g_snprintf (token_string, token_string_len, "scanner: unterminated comment");
 858           break;
 859
 860         case  G_ERR_NON_DIGIT_IN_CONST:
 861           g_snprintf (token_string, token_string_len, "scanner: non digit in constant");
 862           break;
 863
 864         case  G_ERR_FLOAT_RADIX:
 865           g_snprintf (token_string, token_string_len, "scanner: invalid radix for floating constant");
 866           break;
 867
 868         case  G_ERR_FLOAT_MALFORMED:
 869           g_snprintf (token_string, token_string_len, "scanner: malformed floating constant");
 870           break;
 871
 872         case  G_ERR_DIGIT_RADIX:
 873           g_snprintf (token_string, token_string_len, "scanner: digit is beyond radix");
 874           break;
 875
 876         case  G_ERR_UNKNOWN:
 877         default:
 878           g_snprintf (token_string, token_string_len, "scanner: unknown error");
 879           break;
 880         }
 881       break;
 882
 883     case  G_TOKEN_CHAR:
 884       g_snprintf (token_string, token_string_len, "character `%c'", scanner->value.v_char);
 885       break;
 886
 887     case  G_TOKEN_IDENTIFIER:
 888       if (expected_token == G_TOKEN_IDENTIFIER)
 889         print_unexp = FALSE;
 890       g_snprintf (token_string,
 891                   token_string_len,
 892                   "%s%s `%s'",
 893                   print_unexp ? "" : "invalid ",
 894                   identifier_spec,
 895                   scanner->value.v_string);
 896       break;
 897
 898     case  G_TOKEN_BINARY:
 899     case  G_TOKEN_OCTAL:
 900     case  G_TOKEN_INT:
 901     case  G_TOKEN_HEX:
 902       g_snprintf (token_string, token_string_len, "number `%ld'", scanner->value.v_int);
 903       break;
 904
 905     case  G_TOKEN_FLOAT:
 906       g_snprintf (token_string, token_string_len, "number `%.3f'", scanner->value.v_float);
 907       break;
 908
 909     case  G_TOKEN_STRING:
 910       if (expected_token == G_TOKEN_STRING)
 911         print_unexp = FALSE;
 912       g_snprintf (token_string,
 913                   token_string_len,
 914                   "%s%sstring constant \"%s\"",
 915                   print_unexp ? "" : "invalid ",
 916                   scanner->value.v_string[0] == 0 ? "empty " : "",
 917                   scanner->value.v_string);
 918       token_string[token_string_len - 2] = '"';
 919       token_string[token_string_len - 1] = 0;
 920       break;
 921
 922     case  G_TOKEN_COMMENT_SINGLE:
 923     case  G_TOKEN_COMMENT_MULTI:
 924       g_snprintf (token_string, token_string_len, "comment");
 925       break;
 926
 927     case  G_TOKEN_NONE:
 928       /* somehow the user's parsing code is screwed, there isn't much
 929        * we can do about it.
 930        * Note, a common case to trigger this is
 931        * g_scanner_peek_next_token(); g_scanner_unexp_token();
 932        * without an intermediate g_scanner_get_next_token().
 933        */
 934       g_assert_not_reached ();
 935       break;
 936     }
 937
 938
 939   switch (expected_token)
 940     {
 941       gboolean need_valid;
 942
 943     default:
 944       if (expected_token >= 1 && expected_token <= 255)
 945         {
 946           if ((expected_token >= ' ' && expected_token <= '~') ||
 947               strchr (scanner->config->cset_identifier_first, expected_token) ||
 948               strchr (scanner->config->cset_identifier_nth, expected_token))
 949             g_snprintf (expected_string, expected_string_len, "character `%c'", expected_token);
 950           else
 951             g_snprintf (expected_string, expected_string_len, "character `\\%o'", expected_token);
 952           break;
 953         }
 954       else if (!scanner->config->symbol_2_token)
 955         {
 956           g_snprintf (expected_string, expected_string_len, "(unknown) token <%d>", expected_token);
 957           break;
 958         }
 959       /* fall through */
 960     case  G_TOKEN_SYMBOL:
 961       need_valid = (scanner->token == G_TOKEN_SYMBOL ||
 962                     (scanner->config->symbol_2_token &&
 963                      scanner->token > G_TOKEN_LAST));
 964       g_snprintf (expected_string,
 965                   expected_string_len,
 966                   "%s%s",
 967                   need_valid ? "valid " : "",
 968                   symbol_spec);
 969       /* FIXME: should we attempt to lookup the symbol_name for symbol_2_token? */
 970       break;
 971
 972     case  G_TOKEN_INT:
 973       g_snprintf (expected_string, expected_string_len, "number (integer)");
 974       break;
 975
 976     case  G_TOKEN_FLOAT:
 977       g_snprintf (expected_string, expected_string_len, "number (float)");
 978       break;
 979
 980     case  G_TOKEN_STRING:
 981       g_snprintf (expected_string,
 982                   expected_string_len,
 983                   "%sstring constant",
 984                   scanner->token == G_TOKEN_STRING ? "valid " : "");
 985       break;
 986
 987     case  G_TOKEN_IDENTIFIER:
 988       g_snprintf (expected_string,
 989                   expected_string_len,
 990                   "%s%s",
 991                   scanner->token == G_TOKEN_IDENTIFIER ? "valid " : "",
 992                   identifier_spec);
 993       break;
 994
 995     case  G_TOKEN_NONE:
 996       break;
 997     }
 998
 999   if (message && message[0] != 0)
1000     message_prefix = " - ";
1001   else
1002     {
1003       message_prefix = "";
1004       message = "";
1005     }
1006
1007   if (expected_token != G_TOKEN_NONE)
1008     {
1009       if (print_unexp)
1010         msg_handler (scanner,
1011                      "unexpected %s, expected %s%s%s",
1012                      token_string,
1013                      expected_string,
1014                      message_prefix,
1015                      message);
1016       else
1017         msg_handler (scanner,
1018                      "%s, expected %s%s%s",
1019                      token_string,
1020                      expected_string,
1021                      message_prefix,
1022                      message);
1023     }
1024   else
1025     {
1026       if (print_unexp)
1027         msg_handler (scanner,
1028                      "unexpected %s%s%s",
1029                      token_string,
1030                      message_prefix,
1031                      message);
1032       else
1033         msg_handler (scanner,
1034                      "%s%s%s",
1035                      token_string,
1036                      message_prefix,
1037                      message);
1038     }
1039
1040   g_free (token_string);
1041   g_free (expected_string);
1042 }
1043
1044 gint
1045 g_scanner_stat_mode (const gchar *filename)
1046 {
1047   struct stat  *stat_buf;
1048   gint          st_mode;
1049
1050   stat_buf = g_new0 (struct stat, 1);
1051
1052   lstat (filename, stat_buf);
1053
1054   st_mode = stat_buf->st_mode;
1055
1056   g_free (stat_buf);
1057
1058   return st_mode;
1059 }
1060
1061 static void
1062 g_scanner_free_value (GTokenType     *token_p,
1063                       GValue         *value_p)
1064 {
1065   switch (*token_p)
1066     {
1067     case  G_TOKEN_STRING:
1068     case  G_TOKEN_IDENTIFIER:
1069     case  G_TOKEN_IDENTIFIER_NULL:
1070     case  G_TOKEN_COMMENT_SINGLE:
1071     case  G_TOKEN_COMMENT_MULTI:
1072       g_free (value_p->v_string);
1073       break;
1074
1075     default:
1076       break;
1077     }
1078
1079   *token_p = G_TOKEN_NONE;
1080 }
1081
1082 static void
1083 g_scanner_get_token_i (GScanner *scanner,
1084                        GTokenType       *token_p,
1085                        GValue           *value_p,
1086                        guint            *line_p,
1087                        guint            *position_p)
1088 {
1089   do
1090     {
1091       g_scanner_free_value (token_p, value_p);
1092       g_scanner_get_token_ll (scanner, token_p, value_p, line_p, position_p);
1093     }
1094   while (((*token_p > 0 && *token_p < 256) &&
1095           strchr (scanner->config->cset_skip_characters, *token_p)) ||
1096          (*token_p == G_TOKEN_CHAR &&
1097           strchr (scanner->config->cset_skip_characters, value_p->v_char)) ||
1098          (*token_p == G_TOKEN_COMMENT_MULTI &&
1099           scanner->config->skip_comment_multi) ||
1100          (*token_p == G_TOKEN_COMMENT_SINGLE &&
1101           scanner->config->skip_comment_single));
1102
1103   switch (*token_p)
1104     {
1105     case G_TOKEN_IDENTIFIER:
1106       if (scanner->config->identifier_2_string)
1107         *token_p = G_TOKEN_STRING;
1108       break;
1109
1110     case G_TOKEN_SYMBOL:
1111       if (scanner->config->symbol_2_token)
1112         *token_p = (GTokenType) value_p->v_symbol;
1113       break;
1114
1115     case G_TOKEN_BINARY:
1116     case G_TOKEN_OCTAL:
1117     case G_TOKEN_HEX:
1118       if (scanner->config->numbers_2_int)
1119         *token_p = G_TOKEN_INT;
1120       break;
1121
1122     default:
1123       break;
1124     }
1125
1126   if (*token_p == G_TOKEN_INT &&
1127       scanner->config->int_2_float)
1128     {
1129       *token_p = G_TOKEN_FLOAT;
1130       value_p->v_float = value_p->v_int;
1131     }
1132
1133   errno = 0;
1134 }
1135
1136 static void
1137 g_scanner_get_token_ll  (GScanner       *scanner,
1138                          GTokenType     *token_p,
1139                          GValue         *value_p,
1140                          guint          *line_p,
1141                          guint          *position_p)
1142 {
1143   register GScannerConfig       *config;
1144   register gboolean             in_comment_multi;
1145   register gboolean             in_comment_single;
1146   register gboolean             in_string_sq;
1147   register gboolean             in_string_dq;
1148   static   guchar               ch;
1149   register GTokenType           token;
1150   register GValue               value;
1151   register GString              *gstring;
1152
1153   config = scanner->config;
1154   (*value_p).v_int = 0;
1155
1156   if (scanner->token == G_TOKEN_EOF ||
1157       (!scanner->text_len &&
1158        (scanner->input_fd < 0 ||
1159         scanner->peeked_char == 0)))
1160     {
1161       *token_p = G_TOKEN_EOF;
1162       return;
1163     }
1164
1165   in_comment_multi = FALSE;
1166   in_comment_single = FALSE;
1167   in_string_sq = FALSE;
1168   in_string_dq = FALSE;
1169   gstring = NULL;
1170
1171   do
1172     {
1173       register gboolean         dotted_float = FALSE;
1174
1175       ch = g_scanner_get_char (scanner, line_p, position_p);
1176
1177       value.v_int = 0;
1178       token = G_TOKEN_NONE;
1179
1180       /* this is *evil*, but needed ;(
1181        * we first check for identifier first character, because  it
1182        * might interfere with other key chars like slashes or numbers
1183        */
1184       if (config->scan_identifier &&
1185           ch && strchr (config->cset_identifier_first, ch))
1186         goto identifier_precedence;
1187
1188       switch (ch)
1189         {
1190           register gboolean     in_number;
1191           static         gchar          *endptr;
1192
1193         case  0:
1194           token = G_TOKEN_EOF;
1195           (*position_p)++;
1196           ch = 0;
1197           break;
1198
1199         case  '/':
1200           if (!config->scan_comment_multi ||
1201               g_scanner_peek_next_char (scanner) != '*')
1202             goto default_case;
1203           g_scanner_get_char (scanner, line_p, position_p);
1204           token = G_TOKEN_COMMENT_MULTI;
1205           in_comment_multi = TRUE;
1206           gstring = g_string_new ("");
1207           while ((ch = g_scanner_get_char (scanner, line_p, position_p)) != 0)
1208             {
1209               if (ch == '*' && g_scanner_peek_next_char (scanner) == '/')
1210                 {
1211                   g_scanner_get_char (scanner, line_p, position_p);
1212                   in_comment_multi = FALSE;
1213                   break;
1214                 }
1215               else
1216                 gstring = g_string_append_c (gstring, ch);
1217             }
1218           ch = 0;
1219           break;
1220
1221         case  '\'':
1222           if (!config->scan_string_sq)
1223             goto default_case;
1224           token = G_TOKEN_STRING;
1225           in_string_sq = TRUE;
1226           gstring = g_string_new ("");
1227           while ((ch = g_scanner_get_char (scanner, line_p, position_p)) != 0)
1228             {
1229               if (ch == '\'')
1230                 {
1231                   in_string_sq = FALSE;
1232                   break;
1233                 }
1234               else
1235                 gstring = g_string_append_c (gstring, ch);
1236             }
1237           ch = 0;
1238           break;
1239
1240         case  '"':
1241           if (!config->scan_string_dq)
1242             goto default_case;
1243           token = G_TOKEN_STRING;
1244           in_string_dq = TRUE;
1245           gstring = g_string_new ("");
1246           while ((ch = g_scanner_get_char (scanner, line_p, position_p)) != 0)
1247             {
1248               if (ch == '"')
1249                 {
1250                   in_string_dq = FALSE;
1251                   break;
1252                 }
1253               else
1254                 {
1255                   if (ch == '\\')
1256                     {
1257                       ch = g_scanner_get_char (scanner, line_p, position_p);
1258                       switch (ch)
1259                         {
1260                           register guint        i;
1261                           register guint        fchar;
1262
1263                         case  0:
1264                           break;
1265
1266                         case  '\\':
1267                           gstring = g_string_append_c (gstring, '\\');
1268                           break;
1269
1270                         case  'n':
1271                           gstring = g_string_append_c (gstring, '\n');
1272                           break;
1273
1274                         case  't':
1275                           gstring = g_string_append_c (gstring, '\t');
1276                           break;
1277
1278                         case  'r':
1279                           gstring = g_string_append_c (gstring, '\r');
1280                           break;
1281
1282                         case  'b':
1283                           gstring = g_string_append_c (gstring, '\b');
1284                           break;
1285
1286                         case  'f':
1287                           gstring = g_string_append_c (gstring, '\f');
1288                           break;
1289
1290                         case  '0':
1291                         case  '1':
1292                         case  '2':
1293                         case  '3':
1294                         case  '4':
1295                         case  '5':
1296                         case  '6':
1297                         case  '7':
1298                           i = ch - '0';
1299                           fchar = g_scanner_peek_next_char (scanner);
1300                           if (fchar >= '0' && fchar <= '7')
1301                             {
1302                               ch = g_scanner_get_char (scanner, line_p, position_p);
1303                               i= i * 8 + ch - '0';
1304                               fchar = g_scanner_peek_next_char (scanner);
1305                               if (fchar >= '0' && fchar <= '7')
1306                                 {
1307                                   ch = g_scanner_get_char (scanner, line_p, position_p);
1308                                   i = i * 8 + ch - '0';
1309                                 }
1310                             }
1311                           gstring = g_string_append_c (gstring, i);
1312                           break;
1313
1314                         default:
1315                           gstring = g_string_append_c (gstring, ch);
1316                           break;
1317                         }
1318                     }
1319                   else
1320                     gstring = g_string_append_c (gstring, ch);
1321                 }
1322             }
1323           ch = 0;
1324           break;
1325
1326         case  '.':
1327           if (!config->scan_float)
1328             goto default_case;
1329           token = G_TOKEN_FLOAT;
1330           dotted_float = TRUE;
1331           ch = g_scanner_get_char (scanner, line_p, position_p);
1332           goto number_parsing;
1333
1334         case  '$':
1335           if (!config->scan_hex_dollar)
1336             goto default_case;
1337           token = G_TOKEN_HEX;
1338           ch = g_scanner_get_char (scanner, line_p, position_p);
1339           goto number_parsing;
1340
1341         case  '0':
1342           if (config->scan_octal)
1343             token = G_TOKEN_OCTAL;
1344           else
1345             token = G_TOKEN_INT;
1346           ch = g_scanner_peek_next_char (scanner);
1347           if (config->scan_hex && (ch == 'x' || ch == 'X'))
1348             {
1349               token = G_TOKEN_HEX;
1350               g_scanner_get_char (scanner, line_p, position_p);
1351               ch = g_scanner_get_char (scanner, line_p, position_p);
1352               if (ch == 0)
1353                 {
1354                   token = G_TOKEN_ERROR;
1355                   value.v_error = G_ERR_UNEXP_EOF;
1356                   (*position_p)++;
1357                   break;
1358                 }
1359               if (g_scanner_char_2_num (ch, 16) < 0)
1360                 {
1361                   token = G_TOKEN_ERROR;
1362                   value.v_error = G_ERR_DIGIT_RADIX;
1363                   ch = 0;
1364                   break;
1365                 }
1366             }
1367           else if (config->scan_binary && (ch == 'b' || ch == 'B'))
1368             {
1369               token = G_TOKEN_BINARY;
1370               g_scanner_get_char (scanner, line_p, position_p);
1371               ch = g_scanner_get_char (scanner, line_p, position_p);
1372               if (ch == 0)
1373                 {
1374                   token = G_TOKEN_ERROR;
1375                   value.v_error = G_ERR_UNEXP_EOF;
1376                   (*position_p)++;
1377                   break;
1378                 }
1379               if (g_scanner_char_2_num (ch, 10) < 0)
1380                 {
1381                   token = G_TOKEN_ERROR;
1382                   value.v_error = G_ERR_NON_DIGIT_IN_CONST;
1383                   ch = 0;
1384                   break;
1385                 }
1386             }
1387           else
1388             ch = '0';
1389           /* fall through */
1390         case  '1':
1391         case  '2':
1392         case  '3':
1393         case  '4':
1394         case  '5':
1395         case  '6':
1396         case  '7':
1397         case  '8':
1398         case  '9':
1399         number_parsing:
1400         if (token == G_TOKEN_NONE)
1401           token = G_TOKEN_INT;
1402
1403         gstring = g_string_new (dotted_float ? "0." : "");
1404         gstring = g_string_append_c (gstring, ch);
1405         in_number = TRUE;
1406         while (in_number)
1407           {
1408             register gboolean is_E;
1409
1410             is_E = (ch == 'e' || ch == 'E') && token == G_TOKEN_FLOAT;
1411             ch = g_scanner_peek_next_char (scanner);
1412
1413             if (g_scanner_char_2_num (ch, 36) >= 0 ||
1414                 (config->scan_float && ch == '.') ||
1415                 (is_E && ch == '+') ||
1416                 (is_E && ch == '-') )
1417               ch = g_scanner_get_char (scanner, line_p, position_p);
1418             else
1419               in_number = FALSE;
1420
1421             if (in_number)
1422               switch (ch)
1423                 {
1424                 case  '.':
1425                   if (token != G_TOKEN_INT &&
1426                       token != G_TOKEN_OCTAL)
1427                     {
1428                       token = G_TOKEN_ERROR;
1429                       if (token == G_TOKEN_FLOAT)
1430                         value.v_error = G_ERR_FLOAT_MALFORMED;
1431                       else
1432                         value.v_error = G_ERR_FLOAT_RADIX;
1433                       in_number = FALSE;
1434                     }
1435                   else
1436                     {
1437                       token = G_TOKEN_FLOAT;
1438                       gstring = g_string_append_c (gstring, ch);
1439                     }
1440                   break;
1441
1442                 case    '0':
1443                 case  '1':
1444                 case  '2':
1445                 case  '3':
1446                 case  '4':
1447                 case  '5':
1448                 case  '6':
1449                 case  '7':
1450                 case  '8':
1451                 case  '9':
1452                   gstring = g_string_append_c (gstring, ch);
1453                   break;
1454
1455                 case    '-':
1456                 case    '+':
1457                   if (token != G_TOKEN_FLOAT)
1458                     {
1459                       token = G_TOKEN_ERROR;
1460                       value.v_error = G_ERR_NON_DIGIT_IN_CONST;
1461                       in_number = FALSE;
1462                     }
1463                   else
1464                     gstring = g_string_append_c (gstring, ch);
1465                   break;
1466
1467                 case    'e':
1468                 case    'E':
1469                   if ((token != G_TOKEN_HEX && !config->scan_float) ||
1470                       (token != G_TOKEN_HEX &&
1471                        token != G_TOKEN_OCTAL &&
1472                        token != G_TOKEN_FLOAT &&
1473                        token != G_TOKEN_INT))
1474                     {
1475                       token = G_TOKEN_ERROR;
1476                       value.v_error = G_ERR_NON_DIGIT_IN_CONST;
1477                       in_number = FALSE;
1478                     }
1479                   else
1480                     {
1481                       if (token != G_TOKEN_HEX)
1482                         token = G_TOKEN_FLOAT;
1483                       gstring = g_string_append_c (gstring, ch);
1484                     }
1485                   break;
1486
1487                 default:
1488                   if (token != G_TOKEN_HEX)
1489                     {
1490                       token = G_TOKEN_ERROR;
1491                       value.v_error = G_ERR_NON_DIGIT_IN_CONST;
1492                       in_number = FALSE;
1493                     }
1494                   else
1495                     gstring = g_string_append_c (gstring, ch);
1496                   break;
1497                 }
1498           }
1499         endptr = NULL;
1500         switch (token)
1501           {
1502           case  G_TOKEN_BINARY:
1503             value.v_binary = strtol (gstring->str, &endptr, 2);
1504             break;
1505
1506           case  G_TOKEN_OCTAL:
1507             value.v_octal = strtol (gstring->str, &endptr, 8);
1508             break;
1509
1510           case  G_TOKEN_INT:
1511             value.v_int = strtol (gstring->str, &endptr, 10);
1512             break;
1513
1514           case  G_TOKEN_FLOAT:
1515             value.v_float = g_strtod (gstring->str, &endptr);
1516             break;
1517
1518           case  G_TOKEN_HEX:
1519             value.v_hex = strtol (gstring->str, &endptr, 16);
1520             break;
1521
1522           default:
1523             break;
1524           }
1525         if (endptr && *endptr)
1526           {
1527             token = G_TOKEN_ERROR;
1528             if (*endptr == 'e' || *endptr == 'E')
1529               value.v_error = G_ERR_NON_DIGIT_IN_CONST;
1530             else
1531               value.v_error = G_ERR_DIGIT_RADIX;
1532           }
1533         g_string_free (gstring, TRUE);
1534         gstring = NULL;
1535         ch = 0;
1536         break;
1537
1538         default:
1539         default_case:
1540         if (config->cpair_comment_single &&
1541             ch == config->cpair_comment_single[0])
1542           {
1543             token = G_TOKEN_COMMENT_SINGLE;
1544             in_comment_single = TRUE;
1545             gstring = g_string_new ("");
1546             while ((ch = g_scanner_get_char (scanner,
1547                                              line_p,
1548                                              position_p)) != 0)
1549               {
1550                 if (ch == config->cpair_comment_single[1])
1551                   {
1552                     in_comment_single = FALSE;
1553                     ch = 0;
1554                     break;
1555                   }
1556
1557                 gstring = g_string_append_c (gstring, ch);
1558                 ch = 0;
1559               }
1560           }
1561         else if (config->scan_identifier && ch &&
1562                  strchr (config->cset_identifier_first, ch))
1563           {
1564           identifier_precedence:
1565
1566             if (config->cset_identifier_nth && ch &&
1567                 strchr (config->cset_identifier_nth,
1568                         g_scanner_peek_next_char (scanner)))
1569               {
1570                 token = G_TOKEN_IDENTIFIER;
1571                 gstring = g_string_new ("");
1572                 gstring = g_string_append_c (gstring, ch);
1573                 do
1574                   {
1575                     ch = g_scanner_get_char (scanner, line_p, position_p);
1576                     gstring = g_string_append_c (gstring, ch);
1577                     ch = g_scanner_peek_next_char (scanner);
1578                   }
1579                 while (ch && strchr (config->cset_identifier_nth, ch));
1580                 ch = 0;
1581               }
1582             else if (config->scan_identifier_1char)
1583               {
1584                 token = G_TOKEN_IDENTIFIER;
1585                 value.v_identifier = g_new0 (gchar, 2);
1586                 value.v_identifier[0] = ch;
1587                 ch = 0;
1588               }
1589           }
1590         if (ch)
1591           {
1592             if (config->char_2_token)
1593               token = ch;
1594             else
1595               {
1596                 token = G_TOKEN_CHAR;
1597                 value.v_char = ch;
1598               }
1599             ch = 0;
1600           }
1601         break;
1602         }
1603       g_assert (ch == 0 && token != G_TOKEN_NONE);
1604     }
1605   while (ch != 0);
1606
1607   if (in_comment_multi ||
1608       in_comment_single ||
1609       in_string_sq ||
1610       in_string_dq)
1611     {
1612       token = G_TOKEN_ERROR;
1613       if (gstring)
1614         {
1615           g_string_free (gstring, TRUE);
1616           gstring = NULL;
1617         }
1618       (*position_p)++;
1619       if (in_comment_multi || in_comment_single)
1620         value.v_error = G_ERR_UNEXP_EOF_IN_COMMENT;
1621       else if (in_string_sq || in_string_dq)
1622         value.v_error = G_ERR_UNEXP_EOF_IN_STRING;
1623     }
1624
1625   if (gstring)
1626     {
1627       value.v_string = gstring->str;
1628       g_string_free (gstring, FALSE);
1629       gstring = NULL;
1630     }
1631
1632   if (token == G_TOKEN_IDENTIFIER &&
1633       config->scan_symbols)
1634     {
1635       register GScannerKey      *key;
1636       register guint scope_id;
1637
1638       scope_id = scanner->scope_id;
1639       key = g_scanner_lookup_internal (scanner, scope_id, value.v_identifier);
1640       if (!key && scope_id && scanner->config->scope_0_fallback)
1641         key = g_scanner_lookup_internal (scanner, 0, value.v_identifier);
1642
1643       if (key)
1644         {
1645           g_free (value.v_identifier);
1646           token = G_TOKEN_SYMBOL;
1647           value.v_symbol = key->value;
1648         }
1649     }
1650
1651   if (token == G_TOKEN_IDENTIFIER &&
1652       config->scan_identifier_NULL &&
1653       strlen (value.v_identifier) == 4)
1654     {
1655       gchar *null_upper = "NULL";
1656       gchar *null_lower = "null";
1657
1658       if (scanner->config->case_sensitive)
1659         {
1660           if (value.v_identifier[0] == null_upper[0] &&
1661               value.v_identifier[1] == null_upper[1] &&
1662               value.v_identifier[2] == null_upper[2] &&
1663               value.v_identifier[3] == null_upper[3])
1664             token = G_TOKEN_IDENTIFIER_NULL;
1665         }
1666       else
1667         {
1668           if ((value.v_identifier[0] == null_upper[0] ||
1669                value.v_identifier[0] == null_lower[0]) &&
1670               (value.v_identifier[1] == null_upper[1] ||
1671                value.v_identifier[1] == null_lower[1]) &&
1672               (value.v_identifier[2] == null_upper[2] ||
1673                value.v_identifier[2] == null_lower[2]) &&
1674               (value.v_identifier[3] == null_upper[3] ||
1675                value.v_identifier[3] == null_lower[3]))
1676             token = G_TOKEN_IDENTIFIER_NULL;
1677         }
1678     }
1679
1680   *token_p = token;
1681   *value_p = value;
1682 }