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HostObject.cs
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160 lines (118 loc) · 4.29 KB
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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license.
using System;
using System.Collections;
using System.Reflection;
using System.Runtime.InteropServices.ComTypes;
using Microsoft.ClearScript.Util;
namespace Microsoft.ClearScript
{
internal sealed class HostObject : HostTarget
{
#region data
private readonly object target;
private readonly Type type;
private static readonly MethodInfo getNullWrapperGenericMethod = typeof(HostObject).GetMethod("GetNullWrapperGeneric", BindingFlags.NonPublic | BindingFlags.Static);
#endregion
#region constructors
private HostObject(object target, Type type)
{
target = CanonicalRefTable.GetCanonicalRef(target);
if (type == null)
{
type = target.GetType();
}
if (type.IsUnknownCOMObject())
{
if (target is IEnumVARIANT enumVariant)
{
target = new EnumeratorWrapper(enumVariant);
type = typeof(IEnumerator);
}
}
this.target = target;
this.type = type;
}
#endregion
#region wrappers
public static HostObject Wrap(object target)
{
return Wrap(target, null);
}
public static HostObject Wrap(object target, Type type)
{
return (target != null) ? new HostObject(target, type) : null;
}
public static object WrapResult(object result, Type type, bool wrapNull)
{
if ((result is HostItem) || (result is HostTarget))
{
return result;
}
if (result == null)
{
return wrapNull ? GetNullWrapper(type) : null;
}
if ((type == typeof(void)) || (type == typeof(object)) || type.IsNullable())
{
return result;
}
if ((type == result.GetType()) || (Type.GetTypeCode(type) != TypeCode.Object))
{
return result;
}
return Wrap(result, type);
}
#endregion
#region internal members
private static HostObject GetNullWrapper(Type type)
{
return (HostObject)getNullWrapperGenericMethod.MakeGenericMethod(type).Invoke(null, ArrayHelpers.GetEmptyArray<object>());
}
// ReSharper disable UnusedMember.Local
private static HostObject GetNullWrapperGeneric<T>()
{
return NullWrapper<T>.Value;
}
// ReSharper restore UnusedMember.Local
#endregion
#region Object overrides
public override string ToString()
{
if ((target is ScriptItem) && (typeof(ScriptItem).IsAssignableFrom(type)))
{
return "ScriptItem";
}
var objectName = target.GetFriendlyName(type);
return MiscHelpers.FormatInvariant("HostObject:{0}", objectName);
}
#endregion
#region HostTarget overrides
public override Type Type => type;
public override object Target => target;
public override object InvokeTarget => target;
public override object DynamicInvokeTarget => target;
public override HostTargetFlags GetFlags(IHostInvokeContext context)
{
var flags = HostTargetFlags.AllowInstanceMembers | HostTargetFlags.AllowExtensionMethods;
if (context.Engine.ExposeHostObjectStaticMembers)
{
flags |= HostTargetFlags.AllowStaticMembers;
}
return flags;
}
public override Invocability GetInvocability(BindingFlags bindFlags, Type accessContext, ScriptAccess defaultAccess, bool ignoreDynamic)
{
return type.GetInvocability(bindFlags, accessContext, defaultAccess, ignoreDynamic);
}
#endregion
#region Nested type: NullWrapper<T>
// ReSharper disable UnusedMember.Local
private static class NullWrapper<T>
{
public static HostObject Value { get; } = new HostObject(null, typeof(T));
}
// ReSharper restore UnusedMember.Local
#endregion
}
}