src/flex-scanner.h

   1 /* Common parts between scan-code.l, scan-gram.l, and scan-skel.l.
   2
   3    Copyright (C) 2006, 2009-2015 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 3 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, see <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef FLEX_PREFIX
  21 # error "FLEX_PREFIX not defined"
  22 #endif
  23
  24 /* Flex full version as a number.  */
  25 #define FLEX_VERSION                    \
  26   ((YY_FLEX_MAJOR_VERSION) * 1000000    \
  27    + (YY_FLEX_MINOR_VERSION) * 1000     \
  28    + (YY_FLEX_SUBMINOR_VERSION))
  29
  30 /* Pacify "gcc -Wmissing-prototypes" when flex 2.5.31 is used.  */
  31 #if FLEX_VERSION <= 2005031
  32 int   FLEX_PREFIX (get_lineno) (void);
  33 FILE *FLEX_PREFIX (get_in) (void);
  34 FILE *FLEX_PREFIX (get_out) (void);
  35 int   FLEX_PREFIX (get_leng) (void);
  36 char *FLEX_PREFIX (get_text) (void);
  37 void  FLEX_PREFIX (set_lineno) (int);
  38 void  FLEX_PREFIX (set_in) (FILE *);
  39 void  FLEX_PREFIX (set_out) (FILE *);
  40 int   FLEX_PREFIX (get_debug) (void);
  41 void  FLEX_PREFIX (set_debug) (int);
  42 int   FLEX_PREFIX (lex_destroy) (void);
  43 #endif
  44
  45 #define last_string    FLEX_PREFIX (last_string)
  46
  47 /* It seems to be a nice "feature" of Flex that one cannot use yytext,
  48    yyleng etc. when a prefix is given, since there is no longer a
  49    #define, but rather the token is actually changed in the output.
  50    However, this is not true for Flex 2.5.4.  */
  51 #ifndef yyleng
  52 # define yyleng  FLEX_PREFIX (leng)
  53 #endif
  54 #ifndef yytext
  55 # define yytext  FLEX_PREFIX (text)
  56 #endif
  57
  58 /* Non-reentrant scanners generated by Flex 2.5.9 and later (and some earlier
  59    versions according to the Flex manual) leak memory if yylex_destroy is not
  60    invoked.  However, yylex_destroy is not defined before Flex 2.5.9, so give
  61    an implementation here that at least appears to work with Flex 2.5.4.  */
  62 #if FLEX_VERSION <= 2005009
  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   (last_string = obstack_finish0 (&obstack_for_string))
  84
  85 # define STRING_FREE                                    \
  86   obstack_free (&obstack_for_string, last_string)
  87
  88 #endif