package ec.gp.syntactic.simplification.logic;

import ec.EvolutionState;
import ec.app.semanticGP.func.logic.Nand;
import ec.app.semanticGP.func.logic.Or;
import ec.gp.GPNode;
import ec.gp.syntactic.simplification.IRule;
import ec.util.Parameter;

class NandNandNandToOrRule implements IRule {

	@Override
	public void setup(EvolutionState state, Parameter base) {
		// TODO Auto-generated method stub

	}

	@Override
	public boolean match(GPNode subtree) {
		if (!(subtree instanceof Nand))
			return false;

		if (!(subtree.children[0] instanceof Nand && subtree.children[1] instanceof Nand))
			return false;

		return subtree.children[0].children[0].rootedTreeEquals(subtree.children[0].children[1])
				&&
				subtree.children[1].children[0].rootedTreeEquals(subtree.children[1].children[1]);
	}

	@Override
	public GPNode replace(GPNode subtree) {
		assert match(subtree) : "The given tree is not a form of nand(nand(p,p), nand(q,q))";

		Or or = new Or();
		or.children = new GPNode[] { subtree.children[0].children[0], subtree.children[1].children[0] };

		return or;

	}

}
