private bool TryLookupInBase(CodeContext context, PythonType pt, string name, object self, out object value)
{
PythonTypeSlot dts;
if (pt.OldClass == null)
{
// new-style class, or reflected type, lookup slot
if (pt.TryLookupSlot(context, name, out dts) &&
dts.TryGetValue(context, self, DescriptorContext, out value))
{
return(true);
}
}
else
{
// old-style class, lookup attribute
OldClass dt = pt.OldClass;
if (PythonOps.TryGetBoundAttr(context, dt, name, out value))
{
value = OldClass.GetOldStyleDescriptor(context, value, self, DescriptorContext);
return(true);
}
}
value = null;
return(false);
}
private bool TryLookupInBase(CodeContext context, PythonType pt, string name, object self, out object value)
{
PythonTypeSlot dts;
// new-style class, or reflected type, lookup slot
if (pt.TryLookupSlot(context, name, out dts) &&
dts.TryGetValue(context, self, DescriptorContext, out value))
{
return(true);
}
value = null;
return(false);
}
/// <summary>
/// Looks up a __xyz__ method in slots only (because we should never lookup
/// in instance members for these)
/// </summary>
internal static bool TryLookupSpecialMethod(ICallerContext context, object self, SymbolId symbol, out object ret)
{
IDynamicObject ido = self as IDynamicObject;
if (ido != null)
{
PythonType pt = (PythonType)ido.GetDynamicType();
if (pt.TryLookupSlot(context, symbol, out ret))
{
ret = Ops.GetDescriptor(ret, self, pt);
return(true);
}
}
ret = null;
return(false);
}
internal static bool TryGetValueVirtual(CodeContext context, PythonDictionary self, object key, ref object DefaultGetItem, out object value)
{
IPythonObject sdo = self as IPythonObject;
if (sdo != null)
{
Debug.Assert(sdo != null);
PythonType myType = sdo.PythonType;
object ret;
PythonTypeSlot dts;
if (DefaultGetItem == null)
{
// lazy init our cached DefaultGetItem
TypeCache.Dict.TryLookupSlot(context, "__getitem__", out dts);
bool res = dts.TryGetValue(context, self, TypeCache.Dict, out DefaultGetItem);
Debug.Assert(res);
}
// check and see if it's overridden
if (myType.TryLookupSlot(context, "__getitem__", out dts))
{
dts.TryGetValue(context, self, myType, out ret);
if (ret != DefaultGetItem)
{
// subtype of dict that has overridden __getitem__
// we need to call the user's versions, and handle
// any exceptions.
try {
value = self[key];
return(true);
} catch (KeyNotFoundException) {
value = null;
return(false);
}
}
}
}
value = null;
return(false);
}
