(Torturing the Scanner): Surround the backslash-newline tests with

[bison.git] / src / scan-skel.l

diff --git a/src/scan-skel.l b/src/scan-skel.l
index b78e02f59583c322a94f5b54dccf90acac4f737d..0d7114a7b7f26434dea9f4b5b8c5b34a3c89d61b 100644 (file)
--- a/src/scan-skel.l
+++ b/src/scan-skel.l
@@ -1,55 +1,89 @@
-%{
+/* Scan Bison Skeletons.                                       -*- C -*-
+   Copyright (C) 2001, 2002  Free Software Foundation, Inc.
 
-#include <stdlib.h>
-#include <string.h>
+   This file is part of Bison, the GNU Compiler Compiler.
 
-#include "parse-skel.h"
+   Bison is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
 
-%}
+   Bison is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
 
-%option nounput
-%option noyywrap
-%option yylineno
+   You should have received a copy of the GNU General Public License
+   along with Bison; see the file COPYING.  If not, write to the Free
+   Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+   02111-1307, USA.  */
 
-%%
+%option nodefault noyywrap nounput never-interactive
+%option prefix="skel_" outfile="lex.yy.c"
 
-"%%{line}"          { return LINE; }
-"%%{skeleton-line}" { return SLINE; }
+%{
+#include "system.h"
+#include "quotearg.h"
+#include "error.h"
+#include "getargs.h"
+#include "files.h"
 
-"%%{yacc}"    { return YACC; }
-"%%{section}" { return SECTION; }
+int skel_lex (void);
 
-"%%{guards}"   { return GUARDS; }
-"%%{actions}"  { return ACTIONS; }
-"%%{tokendef}" { return TOKENS; }
+%}
+%%
 
-"%%{"[a-zA-Z][0-9a-zA-Z_-]+"}" { /* Muscle.  */
-  size_t len = strlen (yytext);
-  yylval.string = (char*) malloc (len - 3);
-  strncpy (yylval.string, yytext + 3, len - 4);
-  yylval.string[len - 4] = 0;
-  return MUSCLE;
-}
+%{
+  int lineno IF_LINT (= 0);
+  char *outname = NULL;
+%}
 
-"%%\"".*"\"" { /* String.  */
-  size_t len = strlen (yytext);
-  yylval.string = (char*) malloc (len - 3);
-  strncpy (yylval.string, yytext + 3, len - 4);
-  yylval.string[len - 4] = 0;
-  return STRING;
-}
+"@output ".*\n {
+  char const *filename = yytext + sizeof "@output " - 1;
+  yytext[yyleng - 1] = '\0';
 
-<<EOF>> { /* End of file.  */
-  return 0;
-}
+  if (*filename == '@')
+    {
+      if (strcmp (filename, "@output_header_name@") == 0)
+       filename = spec_defines_file;
+      else if (strcmp (filename, "@output_parser_name@") == 0)
+       filename = parser_file_name;
+      else
+       abort ();
+    }
 
-"\n" { /* End of line.  */
-  return '\n';
+  XFREE (outname);
+  outname = xstrdup (filename);
+  yyout = xfopen (outname, "w");
+  lineno = 1;
 }
 
-. { /* Character.  */
-  yylval.character = *yytext;
-  return CHARACTER;
-}
+"@@"      fputc ('@', yyout);
+"@{"      fputc ('[', yyout);
+"@}"      fputc (']', yyout);
+
+"@oline@"  fprintf (yyout, "%d", lineno);
+"@ofile@"  fputs (quotearg_style (c_quoting_style, outname), yyout);
 
+"@"       abort ();
+\n        lineno++; ECHO;
+.         ECHO;
+
+<<EOF>>           xfclose (yyout); free (outname); return EOF;
 %%
+
+/*------------------------.
+| Scan a Bison skeleton.  |
+`------------------------*/
+
+void scan_skel (FILE *);
+
+void
+scan_skel (FILE *in)
+{
+  skel_in = in;
+  skel_lex ();
+
+  /* Reclaim Flex's buffers.  */
+  yy_delete_buffer (YY_CURRENT_BUFFER);
+}