src/scan-skel.l

   1 /* Scan Bison Skeletons.                                       -*- C -*-
   2
   3    Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006 Free Software
   4    Foundation, Inc.
   5
   6    This file is part of Bison, the GNU Compiler Compiler.
   7
   8    Bison is free software; you can redistribute it and/or modify it
   9    under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2, or (at your option)
  11    any later version.
  12
  13    Bison is distributed in the hope that it will be useful, but
  14    WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16    General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with Bison; see the file COPYING.  If not, write to the Free
  20    Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  21    02110-1301, USA.  */
  22
  23 %option nodefault noyywrap nounput never-interactive debug
  24 %option prefix="skel_" outfile="lex.yy.c"
  25
  26 %{
  27 /* Work around a bug in flex 2.5.31.  See Debian bug 333231
  28    <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=333231>.  */
  29 #undef skel_wrap
  30 #define skel_wrap() 1
  31
  32 #include "system.h"
  33
  34 #include <error.h>
  35 #include <quotearg.h>
  36
  37 #include "complain.h"
  38 #include "getargs.h"
  39 #include "files.h"
  40 #include "scan-skel.h"
  41
  42 /* Pacify "gcc -Wmissing-prototypes" when flex 2.5.31 is used.  */
  43 int skel_lex (void);
  44 int skel_get_lineno (void);
  45 FILE *skel_get_in (void);
  46 FILE *skel_get_out (void);
  47 int skel_get_leng (void);
  48 char *skel_get_text (void);
  49 void skel_set_lineno (int);
  50 void skel_set_in (FILE *);
  51 void skel_set_out (FILE *);
  52 int skel_get_debug (void);
  53 void skel_set_debug (int);
  54 int skel_lex_destroy (void);
  55
  56 #define QPUTS(String) \
  57    fputs (quotearg_style (c_quoting_style, String), yyout)
  58
  59 #define BASE_QPUTS(File) \
  60    QPUTS (base_name (File))
  61
  62 %}
  63 %%
  64
  65 %{
  66   int lineno IF_LINT (= 0);
  67   char *outname = NULL;
  68 %}
  69
  70 "@output ".*\n {
  71   char const *file_name = yytext + sizeof "@output " - 1;
  72   yytext[yyleng - 1] = '\0';
  73
  74   /* Decode special file names.  They include the directory part,
  75      contrary to their "free" occurrences, used for issuing #includes,
  76      which must not include the directory part.  */
  77
  78   if (*file_name == '@')
  79     {
  80       if (strcmp (file_name, "@output_header_name@") == 0)
  81         file_name = spec_defines_file;
  82       else if (strcmp (file_name, "@output_parser_name@") == 0)
  83         file_name = parser_file_name;
  84       else
  85         fatal ("invalid token in skeleton: %s", yytext);
  86     }
  87   if (outname)
  88     {
  89       free (outname);
  90       xfclose (yyout);
  91     }
  92   outname = xstrdup (file_name);
  93   yyout = xfopen (outname, "w");
  94   lineno = 1;
  95 }
  96
  97 "@@"       fputc ('@', yyout);
  98 "@{"       fputc ('[', yyout);
  99 "@}"       fputc (']', yyout);
 100
 101 "@oline@"  fprintf (yyout, "%d", lineno + 1);
 102 "@ofile@"  QPUTS (outname);
 103 "@dir_prefix@" QPUTS (dir_prefix);
 104 "@output_parser_name@"  BASE_QPUTS (parser_file_name);
 105 "@output_header_name@"  BASE_QPUTS (spec_defines_file);
 106
 107   /* This pattern must not match more than the previous @ patterns. */
 108 @[^{}@\n]* fatal ("invalid @ in skeleton: %s", yytext);
 109 \n         lineno++; ECHO;
 110 [^@\n]+    ECHO;
 111
 112 <<EOF>> {
 113   if (outname)
 114     {
 115       free (outname);
 116       xfclose (yyout);
 117     }
 118   return EOF;
 119 }
 120 %%
 121
 122 /*------------------------.
 123 | Scan a Bison skeleton.  |
 124 `------------------------*/
 125
 126 void
 127 scan_skel (FILE *in)
 128 {
 129   skel_in = in;
 130   skel__flex_debug = trace_flag & trace_skeleton;
 131   skel_lex ();
 132   /* Reclaim Flex's buffers.  */
 133   yy_delete_buffer (YY_CURRENT_BUFFER);
 134 }