src/flex-scanner.h

   1 /* Common parts between scan-code.l and scan-gram.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 #include "system.h"
  28
  29 /* Pacify "gcc -Wmissing-prototypes" when flex 2.5.31 is used.  */
  30 int   FLEX_PREFIX (get_lineno) (void);
  31 FILE *FLEX_PREFIX (get_in) (void);
  32 FILE *FLEX_PREFIX (get_out) (void);
  33 int   FLEX_PREFIX (get_leng) (void);
  34 char *FLEX_PREFIX (get_text) (void);
  35 void  FLEX_PREFIX (set_lineno) (int);
  36 void  FLEX_PREFIX (set_in) (FILE *);
  37 void  FLEX_PREFIX (set_out) (FILE *);
  38 int   FLEX_PREFIX (get_debug) (void);
  39 void  FLEX_PREFIX (set_debug) (int);
  40 int   FLEX_PREFIX (lex_destroy) (void);
  41
  42 #define last_string    FLEX_PREFIX (last_string)
  43
  44 /* It seems to be a nice "feature" of Flex that one cannot use yytext,
  45    yyleng etc. when a prefix is given, since there is no longer a
  46    #define, but rather the token is actually changed in the output.
  47    */
  48 #define yyleng  FLEX_PREFIX (leng)
  49 #define yytext  FLEX_PREFIX (text)
  50
  51 /* OBSTACK_FOR_STRING -- Used to store all the characters that we need to
  52    keep (to construct ID, STRINGS etc.).  Use the following macros to
  53    use it.
  54
  55    Use STRING_GROW to append what has just been matched, and
  56    STRING_FINISH to end the string (it puts the ending 0).
  57    STRING_FINISH also stores this string in LAST_STRING, which can be
  58    used, and which is used by STRING_FREE to free the last string.  */
  59
  60 static struct obstack obstack_for_string;
  61
  62 #define STRING_GROW   \
  63   obstack_grow (&obstack_for_string, yytext, yyleng)
  64
  65 #define STRING_FINISH                                   \
  66   do {                                                  \
  67     obstack_1grow (&obstack_for_string, '\0');          \
  68     last_string = obstack_finish (&obstack_for_string); \
  69   } while (0)
  70
  71 #define STRING_FREE \
  72   obstack_free (&obstack_for_string, FLEX_PREFIX (last_string))