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/***************************************************************************************************
Copyright (C) 2025 The Qt Company Ltd.
SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
***************************************************************************************************/
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.InteropServices;
namespace Test_Qt.DotNet.Generator.Support
{
internal static class MetadataResolver
{
private const string TPA = "TRUSTED_PLATFORM_ASSEMBLIES";
public enum CoreAssembly
{
DotNetFramework, // mscorlib
DotNetCore // System.Private.CoreLib
}
/// <summary>
/// Creates a MetadataLoadContext using a PathAssemblyResolver built from:
/// - Trusted Platform Assemblies (TPA) if available
/// - otherwise runtime directory (*.dll)
/// - any extra directories scanned for *.dll
/// - optional explicit assembly file paths
/// </summary>
public static MetadataLoadContext CreateLoadContext(IEnumerable<string> directories = null,
IEnumerable<string> assemblyPaths = null, CoreAssembly core = CoreAssembly.DotNetCore)
{
var paths = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
// Trusted Platform Assemblies
var trustedPlatformAssemblies = AppContext.GetData(TPA) as string;
if (!string.IsNullOrEmpty(trustedPlatformAssemblies)) {
foreach (var path in trustedPlatformAssemblies.Split(Path.PathSeparator))
paths.Add(path);
} else {
// Fallback: runtime directory (*.dll)
var runtimeDirectory = RuntimeEnvironment.GetRuntimeDirectory();
foreach (var path in Directory.EnumerateFiles(runtimeDirectory, "*.dll"))
paths.Add(path);
}
// Extra directories (*.dll)
foreach (var directory in directories?.Where(Directory.Exists) ?? []) {
foreach (var path in Directory.EnumerateFiles(directory, "*.dll"))
paths.Add(path);
}
// Explicit assembly paths
foreach (var path in assemblyPaths?.Where(File.Exists) ?? [])
paths.Add(path);
return new MetadataLoadContext(new PathAssemblyResolver(paths), core switch {
CoreAssembly.DotNetFramework => "mscorlib",
CoreAssembly.DotNetCore => "System.Private.CoreLib",
_ => throw new ArgumentOutOfRangeException(nameof(core), core, null)
});
}
}
}
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