package swa.prakt3;

public class EvalVisitor implements Visitor {
	@Override
	public Number visit(ArithmeticOperation ao, Iterator it) {
		Number leftRes = it.traverse(ao.getLeftOperand(), this);
		Number rightRes = it.traverse(ao.getRightOperand(), this);
		return ao.doOperation(leftRes, rightRes);
	}

	@Override
	public Number visit(ArithmeticVariable av) {
		return av.getValue();
	}
}