public static object __new__(CodeContext context, PythonType type, object o)
{
object reversed;
if (PythonOps.TryGetBoundAttr(context, o, "__reversed__", out reversed))
{
return(PythonCalls.Call(context, reversed));
}
object boundFunc;
PythonTypeSlot getitem;
PythonType pt = DynamicHelpers.GetPythonType(o);
if (!pt.TryResolveSlot(context, "__getitem__", out getitem) ||
!getitem.TryGetValue(context, o, pt, out boundFunc) ||
o is PythonDictionary)
{
throw PythonOps.TypeError("argument to reversed() must be a sequence");
}
int length;
if (!DynamicHelpers.GetPythonType(o).TryGetLength(context, o, out length))
{
throw PythonOps.TypeError("object of type '{0}' has no len()", DynamicHelpers.GetPythonType(o).Name);
}
if (type.UnderlyingSystemType == typeof(ReversedEnumerator))
{
return(new ReversedEnumerator((int)length, boundFunc));
}
return(type.CreateInstance(context, length, getitem));
}
public static object?__new__(CodeContext context, [NotNone] PythonType type, object?o)
{
if (PythonTypeOps.TryInvokeUnaryOperator(context, o, "__reversed__", out object?res))
{
return(res);
}
object boundFunc;
PythonTypeSlot getitem;
PythonType pt = DynamicHelpers.GetPythonType(o);
if (o is null || o is PythonDictionary ||
!pt.TryResolveSlot(context, "__getitem__", out getitem) ||
!getitem.TryGetValue(context, o, pt, out boundFunc))
{
throw PythonOps.TypeError("argument to reversed() must be a sequence");
}
int length;
if (!DynamicHelpers.GetPythonType(o).TryGetLength(context, o, out length))
{
throw PythonOps.TypeError("object of type '{0}' has no len()", PythonOps.GetPythonTypeName(o));
}
if (type.UnderlyingSystemType == typeof(ReversedEnumerator))
{
return(new ReversedEnumerator(length, o, boundFunc));
}
return(type.CreateInstance(context, length, getitem));
}
private static bool IsHashable(SetCollection asSet)
{
PythonTypeSlot pts;
PythonType pt = DynamicHelpers.GetPythonType(asSet);
object slotValue;
return(pt.TryResolveSlot(DefaultContext.Default, "__hash__", out pts) &&
pts.TryGetValue(DefaultContext.Default, asSet, pt, out slotValue) && slotValue != null);
}
private static bool HasPythonProtocol(Type t, string name)
{
if (t.FullName.StartsWith(NewTypeMaker.TypePrefix))
{
return(true);
}
PythonType dt = DynamicHelpers.GetPythonTypeFromType(t);
if (dt == null)
{
return(false);
}
PythonTypeSlot tmp;
return(dt.TryResolveSlot(DefaultContext.Default, name, out tmp));
}
