pythonnet/src/runtime/Codecs/SequenceDecoder.cs at master · saroad2/pythonnet · GitHub

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using System;

using System.Collections.Generic;

namespace Python.Runtime.Codecs

{

public class SequenceDecoder : IPyObjectDecoder

{

internal static bool IsSequence(Type targetType)

{

if (!targetType.IsGenericType)

return false;

return targetType.GetGenericTypeDefinition() == typeof(ICollection<>);

}

internal static bool IsSequence(PyObject objectType)

{

//must implement iterable protocol to fully implement sequence protocol

if (!IterableDecoder.IsIterable(objectType)) return false;

//returns wheter it implements the sequence protocol

//according to python doc this needs to exclude dict subclasses

//but I don't know how to look for that given the objectType

//rather than the instance.

return objectType.HasAttr("__getitem__");

}

public bool CanDecode(PyObject objectType, Type targetType)

{

return IsSequence(objectType) && IsSequence(targetType);

}

public bool TryDecode<T>(PyObject pyObj, out T value)

{

if (pyObj == null) throw new ArgumentNullException(nameof(pyObj));

var elementType = typeof(T).GetGenericArguments()[0];

Type collectionType = typeof(CollectionWrappers.SequenceWrapper<>).MakeGenericType(elementType);

var instance = Activator.CreateInstance(collectionType, new[] { pyObj });

value = (T)instance;

return true;

}

public static SequenceDecoder Instance { get; } = new SequenceDecoder();

public static void Register()

{

PyObjectConversions.RegisterDecoder(Instance);

}

pythonnet/src/runtime/Codecs/SequenceDecoder.cs at master · saroad2/pythonnet · GitHub

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