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 "error.h"
  27 #include "getargs.h"
  28 #include "files.h"
  29 int skel_lex (void);
  30 static int yylineno = 1;
  31 static char *yyoutname = NULL;
  32 %}
  33 %%
  34   /* This is an approximation, but we don't need more. */
  35 ^"#output \""[^\"]+\"\n        {
  36      yytext[yyleng - 2] = '\0';
  37      XFREE (yyoutname);
  38      yyoutname = xstrdup (yytext + strlen ("#output \""));
  39      yyout = xfopen (yyoutname, "w");
  40      yylineno = 1;
  41    }
  42
  43 "@<:@"           fputc ('[', yyout);
  44 "@:>@"           fputc (']', yyout);
  45
  46 "__oline__"      fprintf (yyout, "%d", yylineno+1);
  47 "__ofile__"      fprintf (yyout, "%s", yyoutname);
  48 [^@_\n]+         ECHO;
  49 \n+              yylineno += yyleng; ECHO;
  50 .                ECHO;
  51
  52 <<EOF>>          xfclose (yyout); free (yyoutname); return EOF;
  53 %%
  54
  55 /*------------------------.
  56 | Scan a Bison skeleton.  |
  57 `------------------------*/
  58
  59 void scan_skel (FILE *);
  60
  61 void
  62 scan_skel (FILE *in)
  63 {
  64   skel_in = in;
  65   skel_lex ();
  66
  67   /* Reclaim Flex's buffers.  */
  68   yy_delete_buffer (YY_CURRENT_BUFFER);
  69 }