public Value Evaluate(Scope scope)
{
return scope.Find(Name, Body.Evaluate(scope));
}
public Value Evaluate(Scope scope)
{
if (Scope == null)
return scope.Find(Name);
else
{
Value v = Scope.Evaluate(scope).Self();
if (v.Type == GTType.List)
return new GTTree(from s in v.Enumerate()
select new Usage(Name, s).Evaluate(scope));
else if (v.Type == GTType.Scope)
return ((Scope)v).Find(Name);
else
throw new InvalidOperationException("Cannot dereference from non-scope value: " + v.ToString());
}
}
