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 #define QPUTS(String) \
  43    fputs (quotearg_style (c_quoting_style, String), yyout)
  44
  45 #define BASE_QPUTS(File) \
  46    QPUTS (base_name (File))
  47
  48 %}
  49 %%
  50
  51 %{
  52   int lineno IF_LINT (= 0);
  53   char *outname = NULL;
  54 %}
  55
  56 "@output ".*\n {
  57   char const *file_name = yytext + sizeof "@output " - 1;
  58   yytext[yyleng - 1] = '\0';
  59
  60   /* Decode special file names.  They include the directory part,
  61      contrary to their "free" occurrences, used for issuing #includes,
  62      which must not include the directory part.  */
  63
  64   if (*file_name == '@')
  65     {
  66       if (strcmp (file_name, "@output_header_name@") == 0)
  67         file_name = spec_defines_file;
  68       else if (strcmp (file_name, "@output_parser_name@") == 0)
  69         file_name = parser_file_name;
  70       else
  71         fatal ("invalid token in skeleton: %s", yytext);
  72     }
  73   if (outname)
  74     {
  75       free (outname);
  76       xfclose (yyout);
  77     }
  78   outname = xstrdup (file_name);
  79   yyout = xfopen (outname, "w");
  80   lineno = 1;
  81 }
  82
  83 "@@"       fputc ('@', yyout);
  84 "@{"       fputc ('[', yyout);
  85 "@}"       fputc (']', yyout);
  86
  87 "@oline@"  fprintf (yyout, "%d", lineno + 1);
  88 "@ofile@"  QPUTS (outname);
  89 "@dir_prefix@" QPUTS (dir_prefix);
  90 "@output_parser_name@"  BASE_QPUTS (parser_file_name);
  91 "@output_header_name@"  BASE_QPUTS (spec_defines_file);
  92
  93   /* This pattern must not match more than the previous @ patterns. */
  94 @[^{}@\n]* fatal ("invalid @ in skeleton: %s", yytext);
  95 \n         lineno++; ECHO;
  96 [^@\n]+    ECHO;
  97
  98 <<EOF>> {
  99   if (outname)
 100     {
 101       free (outname);
 102       xfclose (yyout);
 103     }
 104   return EOF;
 105 }
 106 %%
 107
 108 /*------------------------.
 109 | Scan a Bison skeleton.  |
 110 `------------------------*/
 111
 112 void
 113 scan_skel (FILE *in)
 114 {
 115   skel_in = in;
 116   skel__flex_debug = trace_flag & trace_skeleton;
 117   skel_lex ();
 118   /* Reclaim Flex's buffers.  */
 119   yy_delete_buffer (YY_CURRENT_BUFFER);
 120 }