public static bool IsUnknown(object unifiable)
{
if (IsNullOrEmpty(unifiable))
{
return(true);
}
if (IsIncomplete(unifiable))
{
return(true);
}
string ss = Unifiable.ToStringLValue(unifiable);
string s = " " + ss.Replace("_", " ").Replace("-", " ") + " ";
bool b = s.Contains("unknown") || s.Contains("unrec") || s.Contains("unnam") ||
s.Contains("unseen") || s.Contains("default") ||
s.Contains(" some") || s.Contains("*") || s.Contains(" _ ") ||
s.Contains(" nothing ") || s.Contains("undefine") ||
s.Contains("$");
if (b)
{
return(true && !s.Contains(" in ") && !s.Contains(" at ") && !s.Contains(" on "));
}
if (unifiable is Unifiable)
{
if (!((Unifiable)unifiable).IsWildCard)
{
return(false);
}
return(true);
}
return(false);
//switch (s)
//{
// case "":
// return true;
// case "unknown":
// return true;
// case "nothing":
// return true;
// case "*":
// return true;
// case "_":
// return true;
// case "undefined":
// return true;
// default:
// return false;
//}
}