pythonnet/src/runtime/StateSerialization/MaybeMethodBase.cs at master · JakeJP/pythonnet · GitHub

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using System;

using System.Diagnostics;

using System.Diagnostics.CodeAnalysis;

using System.Reflection;

using System.Runtime.Serialization;

using System.Linq;

using Python.Runtime.Reflection;

namespace Python.Runtime

{

[Serializable]

internal struct MaybeMethodBase<T> : ISerializable where T: MethodBase

{

// .ToString() of the serialized object

const string SerializationName = "s";

// The ReflectedType of the object

const string SerializationType = "t";

// Fhe parameters of the MethodBase

const string SerializationParameters = "p";

const string SerializationMethodName = "n";

const string SerializationGenericParamCount = "G";

const string SerializationFlags = "V";

public static implicit operator MaybeMethodBase<T> (T? ob) => new (ob);

readonly string? name;

readonly MethodBase? info;

[NonSerialized]

readonly Exception? deserializationException;

public string DeletedMessage

{

get

{

return $"The .NET {typeof(T)} {name} no longer exists. Cause: " + deserializationException?.Message ;

}

public T Value

{

get

{

if (info == null)

{

throw new SerializationException(DeletedMessage, innerException: deserializationException);

}

return (T)info;

}

public T UnsafeValue => (T)info!;

public string? Name => name;

[MemberNotNullWhen(true, nameof(info))]

public bool Valid => info != null;

public override string ToString()

{

return (info != null ? info.ToString() : $"missing method info: {name}");

}

public MaybeMethodBase(T? mi)

{

info = mi;

name = mi?.ToString();

Debug.Assert(name != null || info == null);

deserializationException = null;

}

internal MaybeMethodBase(SerializationInfo serializationInfo, StreamingContext context)

{

name = serializationInfo.GetString(SerializationName);

info = null;

deserializationException = null;

if (name is null) return;

try

{

// Retrieve the reflected type of the method;

var typeName = serializationInfo.GetString(SerializationType);

var tp = Type.GetType(typeName);

if (tp == null)

{

throw new SerializationException($"The underlying type {typeName} can't be found");

}

var flags = (MaybeMethodFlags)serializationInfo.GetInt32(SerializationFlags);

int genericCount = serializationInfo.GetInt32(SerializationGenericParamCount);

// Get the method's parameters types

var field_name = serializationInfo.GetString(SerializationMethodName);

var param = (ParameterHelper[])serializationInfo.GetValue(SerializationParameters, typeof(ParameterHelper[]));

info = ScanForMethod(tp, field_name, genericCount, flags, param);

}

catch (Exception e)

{

deserializationException = e;

}

static MethodBase ScanForMethod(Type declaringType, string name, int genericCount, MaybeMethodFlags flags, ParameterHelper[] parameters)

{

var bindingFlags = ClassManager.BindingFlags;

if (flags.HasFlag(MaybeMethodFlags.Constructor)) bindingFlags &= ~BindingFlags.Static;

var alternatives = declaringType.GetMember(name,

flags.HasFlag(MaybeMethodFlags.Constructor)

? MemberTypes.Constructor

: MemberTypes.Method,

bindingFlags);

if (alternatives.Length == 0)

throw new MissingMethodException($"{declaringType}.{name}");

var visibility = flags & MaybeMethodFlags.Visibility;

var result = alternatives.Cast<MethodBase>().FirstOrDefault(m

=> MatchesGenericCount(m, genericCount) && MatchesSignature(m, parameters)

&& (Visibility(m) == visibility || ClassManager.ShouldBindMethod(m)));

if (result is null)

throw new MissingMethodException($"Matching overload not found for {declaringType}.{name}");

return result;

}

static bool MatchesGenericCount(MethodBase method, int genericCount)

=> method.ContainsGenericParameters

? method.GetGenericArguments().Length == genericCount

: genericCount == 0;

static bool MatchesSignature(MethodBase method, ParameterHelper[] parameters)

{

var curr = method.GetParameters();

if (curr.Length != parameters.Length) return false;

for (int i = 0; i < curr.Length; i++)

if (!parameters[i].Matches(curr[i])) return false;

return true;

}

public void GetObjectData(SerializationInfo serializationInfo, StreamingContext context)

{

serializationInfo.AddValue(SerializationName, name);

if (Valid)

{

serializationInfo.AddValue(SerializationMethodName, info.Name);

serializationInfo.AddValue(SerializationGenericParamCount,

info.ContainsGenericParameters ? info.GetGenericArguments().Length : 0);

serializationInfo.AddValue(SerializationFlags, (int)Flags(info));

string? typeName = info.ReflectedType.AssemblyQualifiedName;

Debug.Assert(typeName != null);

serializationInfo.AddValue(SerializationType, typeName);

ParameterHelper[] parameters = (from p in info.GetParameters() select new ParameterHelper(p)).ToArray();

serializationInfo.AddValue(SerializationParameters, parameters, typeof(ParameterHelper[]));

}

static MaybeMethodFlags Flags(MethodBase method)

{

var flags = MaybeMethodFlags.Default;

if (method.IsConstructor) flags |= MaybeMethodFlags.Constructor;

if (method.IsStatic) flags |= MaybeMethodFlags.Static;

if (method.IsPublic) flags |= MaybeMethodFlags.Public;

return flags;

}

static MaybeMethodFlags Visibility(MethodBase method)

=> Flags(method) & MaybeMethodFlags.Visibility;

}

[Flags]

internal enum MaybeMethodFlags

{

Default = 0,

Constructor = 1,

Static = 2,

// TODO: other kinds of visibility

Public = 32,

Visibility = Public,

}

pythonnet/src/runtime/StateSerialization/MaybeMethodBase.cs at master · JakeJP/pythonnet · GitHub

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