package ec.gp.syntactic.simplification.logic;

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

class NandNandNandToAndRule 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[1].children[0])
				||
				subtree.children[0].children[0].rootedTreeEquals(subtree.children[1].children[1])
				) && (
				subtree.children[0].children[1].rootedTreeEquals(subtree.children[1].children[0])
				||
				subtree.children[0].children[1].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,q), nand(p,q))";

		And and = new And();
		and.children = subtree.children[0].children;

		return and;

	}

}
