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EnumPyIntCodec.cs
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68 lines (55 loc) · 1.73 KB
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using System;
namespace Python.Runtime.Codecs
{
[Obsolete]
public sealed class EnumPyIntCodec : IPyObjectEncoder, IPyObjectDecoder
{
public static EnumPyIntCodec Instance { get; } = new EnumPyIntCodec();
public bool CanDecode(PyType objectType, Type targetType)
{
return targetType.IsEnum
&& objectType.IsSubclass(Runtime.PyLongType);
}
public bool CanEncode(Type type)
{
return type == typeof(object) || type == typeof(ValueType) || type.IsEnum;
}
public bool TryDecode<T>(PyObject pyObj, out T? value)
{
value = default;
if (!typeof(T).IsEnum) return false;
Type etype = Enum.GetUnderlyingType(typeof(T));
if (!PyInt.IsIntType(pyObj)) return false;
object? result;
try
{
result = pyObj.AsManagedObject(etype);
}
catch (InvalidCastException)
{
return false;
}
if (Enum.IsDefined(typeof(T), result) || typeof(T).IsFlagsEnum())
{
value = (T)Enum.ToObject(typeof(T), result);
return true;
}
return false;
}
public PyObject? TryEncode(object value)
{
if (value is null) return null;
var enumType = value.GetType();
if (!enumType.IsEnum) return null;
try
{
return new PyInt(Convert.ToInt64(value));
}
catch (OverflowException)
{
return new PyInt(Convert.ToUInt64(value));
}
}
private EnumPyIntCodec() { }
}
}