src/scan-skel.l

   1 /* Scan Bison Skeletons.                                       -*- C -*-
   2    Copyright (C) 2001, 2002  Free Software Foundation, Inc.
   3
   4    This file is part of Bison, the GNU Compiler Compiler.
   5
   6    Bison is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2, or (at your option)
   9    any later version.
  10
  11    Bison is distributed in the hope that it will be useful, but
  12    WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with Bison; see the file COPYING.  If not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  19    02111-1307, USA.  */
  20
  21 %option nodefault noyywrap nounput never-interactive
  22 %option prefix="skel_" outfile="lex.yy.c"
  23
  24 %{
  25 #include "system.h"
  26 #include "quotearg.h"
  27 #include "error.h"
  28 #include "getargs.h"
  29 #include "files.h"
  30
  31 int skel_lex (void);
  32
  33 static int yylineno = 1;
  34 static char *yyoutname = NULL;
  35
  36 %}
  37 %%
  38   /* This is an approximation, but we don't need more. */
  39 ^"#output \""[^\"]+\"\n        {
  40      yytext[yyleng - 2] = '\0';
  41      XFREE (yyoutname);
  42      yyoutname = xstrdup (yytext + strlen ("#output \""));
  43      yyout = xfopen (yyoutname, "w");
  44      yylineno = 1;
  45    }
  46
  47 "@<:@"           fputc ('[', yyout);
  48 "@:>@"           fputc (']', yyout);
  49
  50 "__oline__"      fprintf (yyout, "%d", yylineno+1);
  51 "__ofile__"      fprintf (yyout, "%s", quotearg_style (escape_quoting_style, yyoutname));
  52 [^@_\n]+         ECHO;
  53 \n+              yylineno += yyleng; ECHO;
  54 .                ECHO;
  55
  56 <<EOF>>          xfclose (yyout); free (yyoutname); return EOF;
  57 %%
  58
  59 /*------------------------.
  60 | Scan a Bison skeleton.  |
  61 `------------------------*/
  62
  63 void scan_skel (FILE *);
  64
  65 void
  66 scan_skel (FILE *in)
  67 {
  68   skel_in = in;
  69   skel_lex ();
  70
  71   /* Reclaim Flex's buffers.  */
  72   yy_delete_buffer (YY_CURRENT_BUFFER);
  73 }