package luan.impl;

import luan.Luan;
import luan.LuanTable;
import luan.LuanFunction;
import luan.LuanException;
import luan.LuanElement;


abstract class BinaryOpExpr extends CodeImpl implements Expr {
	final Expr op1;
	final Expr op2;

	BinaryOpExpr(LuanElement el,Expr op1,Expr op2) {
		super(el);
		this.op1 = op1;
		this.op2 = op2;
	}

	Object arithmetic(LuanStateImpl luan,String op,Object o1,Object o2) throws LuanException {
		luan.push(el,null);
		try {
			LuanFunction fn = luan.getBinHandler(op,o1,o2);
			if( fn != null )
				return Luan.first(fn.call(luan,new Object[]{o1,o2}));
			String type = !(o1 instanceof Number) ? Luan.type(o1) : Luan.type(o2);
			throw luan.exception("attempt to perform arithmetic on a "+type+" value");
		} finally {
			luan.pop();
		}
	}

}