cloned Nullkiller into Nullkiller2

AI/Nullkiller2/Engine/DeepDecomposer.h

@@ -0,0 +1,48 @@
+/*
+* DeepDecomposer.h, part of VCMI engine
+*
+* Authors: listed in file AUTHORS in main folder
+*
+* License: GNU General Public License v2.0 or later
+* Full text of license available in license.txt file, in main folder
+*
+*/
+#pragma once
+
+#include "../Goals/AbstractGoal.h"
+
+namespace NKAI
+{
+
+struct GoalHash
+{
+	uint64_t operator()(const Goals::TSubgoal & goal) const
+	{
+		return goal->getHash();
+	}
+};
+
+using TGoalHashSet = std::unordered_map<Goals::TSubgoal, Goals::TGoalVec, GoalHash>;
+
+class DeepDecomposer
+{
+private:
+	std::vector<Goals::TGoalVec> goals;
+	std::vector<TGoalHashSet> decompositionCache;
+	int depth;
+	const Nullkiller2 * ai;
+
+public:
+	DeepDecomposer(const Nullkiller2 * ai);
+	void reset();
+	void decompose(Goals::TGoalVec & result, Goals::TSubgoal behavior, int depthLimit);
+
+private:
+	Goals::TSubgoal aggregateGoals(int startDepth, Goals::TSubgoal last);
+	Goals::TSubgoal unwrapComposition(Goals::TSubgoal goal);
+	bool isCompositionLoop(Goals::TSubgoal goal);
+	Goals::TGoalVec decomposeCached(Goals::TSubgoal goal, bool & fromCache);
+	void addToCache(Goals::TSubgoal goal);
+};
+
+}