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+/*
+ *  Quackle -- Crossword game artificial intelligence and analysis tool
+ *  Copyright (C) 2005-2006 Jason Katz-Brown and John O'Laughlin.
+ *
+ *  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 of the License, 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., 51 Franklin Street, Fifth Floor, Boston, MA  
+ *  02110-1301  USA
+ */
+
+#ifndef QUACKLE_EVALUATOR_H
+#define QUACKLE_EVALUATOR_H
+
+#include "alphabetparameters.h"
+
+namespace Quackle
+{
+
+class GamePosition;
+class Move;
+
+class Evaluator
+{
+public:
+	virtual ~Evaluator() {};
+
+	// Default implementations of these return zero for everything but
+	// equity, which returns the score of the move.
+
+	// Return equity of move based on static evaluation
+	// suitable for equity field of move. Rack must be alphabetized.
+	virtual double equity(const GamePosition &position, const Move &move) const;
+
+	virtual double playerConsideration(const GamePosition &position, const Move &move) const;
+	virtual double sharedConsideration(const GamePosition &position, const Move &move) const;
+
+	virtual double leaveValue(const LetterString &leave) const;
+};
+
+class ScorePlusLeaveEvaluator : public Evaluator
+{
+public:
+	virtual ~ScorePlusLeaveEvaluator() {};
+
+	// Evaluator that always returns a score+leave equity
+	virtual double equity(const GamePosition &position, const Move &move) const;
+
+	virtual double playerConsideration(const GamePosition &position, const Move &move) const;
+	virtual double sharedConsideration(const GamePosition &position, const Move &move) const;
+
+	virtual double leaveValue(const LetterString &leave) const;
+};
+
+}
+
+#endif