// evaluate an open expression returning a typed value
// rename -- do it here
// aggregate -- not safe to eval, so just return typed default
public TypedValue EvalOpen(ILookupValue lookup)
{
if (IsValue)
{
return(Value);
}
if (HasFold)
{
return(ReturnType.DefaultValue());
}
TypedValue ret;
if (IsRename || IsProject)
{
ret = Evaluator.Lookup(OldName, lookup);
}
else
{
Logger.Assert(IsOpen || HasWin || lookup == null, Name);
Logger.Assert(Evaluator != null, "evaluator null");
ret = Evaluator.Exec(Code, lookup);
}
CheckReturnType(ret);
return(ret);
}
