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diff --git a/libvaladoc/parser/parsercallback.vala b/libvaladoc/parser/parsercallback.vala
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+++ b/libvaladoc/parser/parsercallback.vala
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+/* parsercallback.vala
+ *
+ * Copyright (C) 2008-2009 Florian Brosch, Didier Villevalois
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
+ *
+ * Author:
+ * 	Didier 'Ptitjes Villevalois <ptitjes@free.fr>
+ */
+
+using Gee;
+
+public interface Valadoc.ParserCallback {
+	public abstract Object? get_rule_state ();
+	public abstract void set_rule_state (Object state);
+
+	public abstract void push_rule (Rule rule);
+	public abstract void reduce ();
+
+	public abstract bool would_parent_accept_token (Token token);
+	public abstract bool would_parent_reduce_to_rule (Token token, Rule rule);
+
+	public abstract void warning (Token? token, string message);
+	public abstract void error (Token? token, string message) throws ParserError;
+}