|
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Reflection;
using System.Text;
namespace WinRT
{
internal static class TypeExtensions
{
public static Type FindHelperType(this Type type)
{
if (typeof(Exception).IsAssignableFrom(type))
{
type = typeof(Exception);
}
Type customMapping = Projections.FindCustomHelperTypeMapping(type);
if (customMapping is object)
{
return customMapping;
}
var helper = $"ABI.{type.FullName}";
string helperTypeName2 = $"MS.Internal.WindowsRuntime.ABI.{type.FullName}";
if (type.FullName.StartsWith("MS.Internal.WindowsRuntime."))
{
helper = $"MS.Internal.WindowsRuntime.ABI.{RemoveNamespacePrefix(type.FullName)}";
}
return Type.GetType(helper) ?? Type.GetType(helperTypeName2);
}
public static Type GetHelperType(this Type type)
{
var helperType = type.FindHelperType();
if (helperType is object)
return helperType;
throw new InvalidOperationException($"Target type is not a projected type: {type.FullName}.");
}
public static Type GetGuidType(this Type type)
{
return type.IsDelegate() ? type.GetHelperType() : type;
}
public static Type FindVftblType(this Type helperType)
{
Type vftblType = helperType.GetNestedType("Vftbl");
if (vftblType is null)
{
return null;
}
if (helperType.IsGenericType && vftblType is object)
{
vftblType = vftblType.MakeGenericType(helperType.GetGenericArguments());
}
return vftblType;
}
public static Type GetAbiType(this Type type)
{
return type.GetHelperType().GetMethod("GetAbi", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static).ReturnType;
}
public static Type GetMarshalerType(this Type type)
{
return type.GetHelperType().GetMethod("CreateMarshaler", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static).ReturnType;
}
public static bool IsDelegate(this Type type)
{
return typeof(Delegate).IsAssignableFrom(type);
}
public static string RemoveNamespacePrefix(string ns)
{
const string NamespacePrefix = "MS.Internal.WindowsRuntime.";
if (ns.StartsWith(NamespacePrefix))
{
return ns.Substring(NamespacePrefix.Length);
}
return ns;
}
}
}
|