public override Value Evaluate()
{
var stack = State.Stack;
var right = stack.Pop(true, LOCATION);
var left = stack.Pop(false, LOCATION);
Alternation alternation;
if (left.Type == Value.ValueType.Alternation)
{
if (left is Variable)
{
left = left.Resolve();
}
alternation = left as Alternation;
alternation.Add(right);
return(left);
}
alternation = new Alternation();
alternation.Add(left);
alternation.Add(right);
return(alternation);
}
