public void Eval(IFuncExpression expr)
{
if (expr is StackOpExpression)
{
var st = (StackOpExpression) expr;
st.Eval(this);
//maybe this should be some sort of message?
RefreshStackView();
return;
}
var vals = _expressions
.AsEnumerable()
.Reverse()
.Take(expr.StackArgs)
.ToList();
var eVal = expr.Eval(vals);
_expressions.RemoveRange(_expressions.Count - expr.StackArgs, expr.StackArgs);
if (expr is NullExpression) return;
Push(eVal);
}