src/flex-scanner.h

   1 /* Common parts between scan-code.l, scan-gram.l, and scan-skel.l.
   2
   3    Copyright (C) 2006 Free Software Foundation, Inc.
   4
   5    This file is part of Bison, the GNU Compiler Compiler.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program 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
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20    02110-1301  USA
  21 */
  22
  23 #ifndef FLEX_PREFIX
  24 # error "FLEX_PREFIX not defined"
  25 #endif
  26
  27 /* Pacify "gcc -Wmissing-prototypes" when flex 2.5.31 is used.  */
  28 int   FLEX_PREFIX (get_lineno) (void);
  29 FILE *FLEX_PREFIX (get_in) (void);
  30 FILE *FLEX_PREFIX (get_out) (void);
  31 int   FLEX_PREFIX (get_leng) (void);
  32 char *FLEX_PREFIX (get_text) (void);
  33 void  FLEX_PREFIX (set_lineno) (int);
  34 void  FLEX_PREFIX (set_in) (FILE *);
  35 void  FLEX_PREFIX (set_out) (FILE *);
  36 int   FLEX_PREFIX (get_debug) (void);
  37 void  FLEX_PREFIX (set_debug) (int);
  38 int   FLEX_PREFIX (lex_destroy) (void);
  39
  40 #define last_string    FLEX_PREFIX (last_string)
  41
  42 /* It seems to be a nice "feature" of Flex that one cannot use yytext,
  43    yyleng etc. when a prefix is given, since there is no longer a
  44    #define, but rather the token is actually changed in the output.
  45    However, this is not true for Flex 2.5.4.  */
  46 #ifndef yyleng
  47 # define yyleng  FLEX_PREFIX (leng)
  48 #endif
  49 #ifndef yytext
  50 # define yytext  FLEX_PREFIX (text)
  51 #endif
  52
  53 /* Non-reentrant scanners generated by Flex 2.5.9 and later (and some earlier
  54    versions according to the Flex manual) leak memory if yylex_destroy is not
  55    invoked.  However, yylex_destroy is not defined before Flex 2.5.9, so give
  56    an implementation here that at least appears to work with Flex 2.5.4.  */
  57 #if !defined(YY_FLEX_MAJOR_VERSION) || YY_FLEX_MAJOR_VERSION < 2 \
  58     || (YY_FLEX_MAJOR_VERSION == 2 \
  59         && (!defined(YY_FLEX_MINOR_VERSION) || YY_FLEX_MINOR_VERSION < 5 \
  60             || (YY_FLEX_MINOR_VERSION == 5 \
  61                 && (!defined(YY_FLEX_SUBMINOR_VERSION) \
  62                     || YY_FLEX_SUBMINOR_VERSION < 9))))
  63 # define yylex_destroy() yy_delete_buffer (YY_CURRENT_BUFFER)
  64 #endif
  65
  66 /* OBSTACK_FOR_STRING -- Used to store all the characters that we need to
  67    keep (to construct ID, STRINGS etc.).  Use the following macros to
  68    use it.
  69
  70    Use STRING_GROW to append what has just been matched, and
  71    STRING_FINISH to end the string (it puts the ending 0).
  72    STRING_FINISH also stores this string in LAST_STRING, which can be
  73    used, and which is used by STRING_FREE to free the last string.  */
  74
  75 #ifndef FLEX_NO_OBSTACK
  76
  77 static struct obstack obstack_for_string;
  78
  79 #define STRING_GROW   \
  80   obstack_grow (&obstack_for_string, yytext, yyleng)
  81
  82 #define STRING_FINISH                                   \
  83   do {                                                  \
  84     obstack_1grow (&obstack_for_string, '\0');          \
  85     last_string = obstack_finish (&obstack_for_string); \
  86   } while (0)
  87
  88 #define STRING_FREE \
  89   obstack_free (&obstack_for_string, last_string)
  90
  91 #endif