Added new screensaver properties capplet

capplets/screensaver/expr.h

@@ -0,0 +1,36 @@
+/* -*- mode: c; style: linux -*- */
+
+/* expr.h
+ * Copyright (C) 2000 Helix Code, Inc.
+ *
+ * Written by Bradford Hovinen (hovinen@helixcode.com)
+ *
+ * This program 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.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+#ifndef __EXPR_H
+#define __EXPR_H
+
+#include <glib.h>
+
+#define SYMBOL_AND ((gpointer) -1)
+#define SYMBOL_OR  ((gpointer) -2)
+#define SYMBOL_NOT ((gpointer) -3)
+
+gboolean parse_sentence (gchar *sentence, GScanner *scanner);
+gdouble parse_expr (gchar *expr, gdouble var);
+
+#endif /* __EXPR_H */