/*****************************************************************************

 JEP 2.4.1, Extensions 1.1.1
      April 30 2007
      (c) Copyright 2007, Nathan Funk and Richard Morris
      See LICENSE-*.txt for license information.

 *****************************************************************************/

package org.nfunk.jep.function;


import java.util.Stack;

import org.nfunk.jep.ParseException;


public class Logical extends PostfixMathCommand {
	int id;
	public static final int AND = 0;
	public static final int OR = 1;
	public static final int XOR = 2;
	public static final int NOR = 3;
	public static final int XNOR = 4;
	public static final int NAND = 5;

	public Logical(int id_in) {
		id = id_in;
		numberOfParameters = 2;
	}

	@Override
	public void run(Stack inStack) throws ParseException {
		checkStack(inStack);// check the stack

		Object param2 = inStack.pop();
		Object param1 = inStack.pop();

		double x, y;
		if ((param1 instanceof Number))
			x = ((Number) param1).doubleValue();
		else if ((param1 instanceof Boolean))
			x = ((Boolean) param1).booleanValue() ? 1.0 : 0.0;
		else
			throw new ParseException("Logical: require a number or Boolean value on left, have " + param1.getClass().getName());
		if ((param2 instanceof Number))
			y = ((Number) param2).doubleValue();
		else if ((param2 instanceof Boolean))
			y = ((Boolean) param2).booleanValue() ? 1.0 : 0.0;
		else
			throw new ParseException("Logical: require a number or Boolean value on right, have " + param1.getClass().getName());

		int r;
		
		boolean a = (x != 0d),b = (y != 0d),out=false;

		switch (id) {
			case AND:
				out = (a && b);
				break;
			case OR:
				out = (a || b);
				break;
			case XOR:
				out = (a != b);
				break;
			case NOR:
				out = !(a || b);
				break;
			case XNOR:
				out = (a == b);
				break;
			case NAND:
				out = !(a && b);
				break;
			default:
				r = 0;
		}
		
		r = out?1:0;
		
		inStack.push(new Double(r)); // push the result on the inStack
		return;
	}
}
