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.  */
43int skel_lex (void);
44int skel_get_lineno (void);
45FILE *skel_get_in (void);
46FILE *skel_get_out (void);
47int skel_get_leng (void);
48char *skel_get_text (void);
49void skel_set_lineno (int);
50void skel_set_in (FILE *);
51void skel_set_out (FILE *);
52int skel_get_debug (void);
53void skel_set_debug (int);
54int 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
126void
127scan_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}
135