* src/nullable.h: New file.

[bison.git] / src / nullable.h

diff --git a/src/nullable.h b/src/nullable.h
new file mode 100644 (file)
index 0000000..1cc5d43
--- /dev/null
+++ b/src/nullable.h
@@ -0,0 +1,33 @@
+/* Part of the bison parser generator,
+   Copyright (C) 2000 Free Software Foundation, Inc.
+
+   This file is part of Bison, the GNU Compiler Compiler.
+
+   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.
+
+   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.  */
+
+#ifndef NULLABLE_H_
+# define NULLABLE_H_
+
+/* A vector saying which nonterminals can expand into the null string.
+   NULLABLE[I - NTOKENS] is nonzero if symbol I can do so.  */
+extern char *nullable;
+
+/* Set up NULLABLE. */
+extern void set_nullable PARAMS((void));
+
+/* Free NULLABLE. */
+extern void free_nullable PARAMS((void));
+#endif /* !NULLABLE_H_ */