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MaybeMethodBase.cs
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185 lines (155 loc) · 6.71 KB
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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,
}
}