/// <summary>
/// Helper for falling back - if we have a base object fallback to it first (which can
/// then fallback to the calling site), otherwise fallback to the calling site.
/// </summary>
private DynamicMetaObject /*!*/ Fallback(DynamicMetaObjectBinder /*!*/ action, DynamicMetaObject codeContext)
{
if (_baseMetaObject != null)
{
IPythonGetable ipyget = _baseMetaObject as IPythonGetable;
if (ipyget != null)
{
PythonGetMemberBinder gmb = action as PythonGetMemberBinder;
if (gmb != null)
{
return(ipyget.GetMember(gmb, codeContext));
}
}
GetMemberBinder gma = action as GetMemberBinder;
if (gma != null)
{
return(_baseMetaObject.BindGetMember(gma));
}
return(_baseMetaObject.BindGetMember(
PythonContext.GetPythonContext(action).CompatGetMember(
GetGetMemberName(action),
false
)
));
}
return(GetMemberFallback(this, action, codeContext));
}
/// <summary>
/// Python's Invoke is a non-standard action. Here we first try to bind through a Python
/// internal interface (IPythonInvokable) which supports CallSigantures. If that fails
/// and we have an IDO then we translate to the DLR protocol through a nested dynamic site -
/// this includes unsplatting any keyword / position arguments. Finally if it's just a plain
/// old .NET type we use the default binder which supports CallSignatures.
/// </summary>
public override DynamicMetaObject /*!*/ Bind(DynamicMetaObject /*!*/ target, DynamicMetaObject /*!*/[] /*!*/ args)
{
Debug.Assert(args.Length == 1);
Debug.Assert(args[0].GetLimitType() == typeof(CodeContext));
// we don't have CodeContext if an IDO falls back to us when we ask them to produce the Call
DynamicMetaObject cc = args[0];
IPythonGetable icc = target as IPythonGetable;
if (icc != null)
{
// get the member using our interface which also supports CodeContext.
return(icc.GetMember(this, cc));
}
else if (target.Value is IDynamicMetaObjectProvider)
{
return(GetForeignObject(target));
}
#if FEATURE_COM
else if (Microsoft.Scripting.ComInterop.ComBinder.IsComObject(target.Value))
{
return(GetForeignObject(target));
}
#endif
return(Fallback(target, cc));
}