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#region License
// Copyright (c) 2007 James Newton-King
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
#endregion
#if !(NET35 || NET20 || PORTABLE40)
using System;
using System.Collections.Generic;
using System.Dynamic;
using System.Linq;
using System.Linq.Expressions;
#if !(PORTABLE)
using System.Reflection;
#else
using Microsoft.CSharp.RuntimeBinder;
#endif
using System.Runtime.CompilerServices;
using System.Text;
using System.Globalization;
using Newtonsoft.Json.Serialization;
namespace Newtonsoft.Json.Utilities
{
internal static class DynamicUtils
{
internal static class BinderWrapper
{
#if !(PORTABLE)
public const string CSharpAssemblyName = "Microsoft.CSharp, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a";
private const string BinderTypeName = "Microsoft.CSharp.RuntimeBinder.Binder, " + CSharpAssemblyName;
private const string CSharpArgumentInfoTypeName = "Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo, " + CSharpAssemblyName;
private const string CSharpArgumentInfoFlagsTypeName = "Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfoFlags, " + CSharpAssemblyName;
private const string CSharpBinderFlagsTypeName = "Microsoft.CSharp.RuntimeBinder.CSharpBinderFlags, " + CSharpAssemblyName;
private static object _getCSharpArgumentInfoArray;
private static object _setCSharpArgumentInfoArray;
private static MethodCall<object, object> _getMemberCall;
private static MethodCall<object, object> _setMemberCall;
private static bool _init;
private static void Init()
{
if (!_init)
{
Type binderType = Type.GetType(BinderTypeName, false);
if (binderType == null)
throw new InvalidOperationException("Could not resolve type '{0}'. You may need to add a reference to Microsoft.CSharp.dll to work with dynamic types.".FormatWith(CultureInfo.InvariantCulture, BinderTypeName));
// None
_getCSharpArgumentInfoArray = CreateSharpArgumentInfoArray(0);
// None, Constant | UseCompileTimeType
_setCSharpArgumentInfoArray = CreateSharpArgumentInfoArray(0, 3);
CreateMemberCalls();
_init = true;
}
}
private static object CreateSharpArgumentInfoArray(params int[] values)
{
Type csharpArgumentInfoType = Type.GetType(CSharpArgumentInfoTypeName);
Type csharpArgumentInfoFlags = Type.GetType(CSharpArgumentInfoFlagsTypeName);
Array a = Array.CreateInstance(csharpArgumentInfoType, values.Length);
for (int i = 0; i < values.Length; i++)
{
MethodInfo createArgumentInfoMethod = csharpArgumentInfoType.GetMethod("Create", new[] { csharpArgumentInfoFlags, typeof(string) });
object arg = createArgumentInfoMethod.Invoke(null, new object[] { 0, null });
a.SetValue(arg, i);
}
return a;
}
private static void CreateMemberCalls()
{
Type csharpArgumentInfoType = Type.GetType(CSharpArgumentInfoTypeName, true);
Type csharpBinderFlagsType = Type.GetType(CSharpBinderFlagsTypeName, true);
Type binderType = Type.GetType(BinderTypeName, true);
Type csharpArgumentInfoTypeEnumerableType = typeof(IEnumerable<>).MakeGenericType(csharpArgumentInfoType);
MethodInfo getMemberMethod = binderType.GetMethod("GetMember", new[] { csharpBinderFlagsType, typeof(string), typeof(Type), csharpArgumentInfoTypeEnumerableType });
_getMemberCall = JsonTypeReflector.ReflectionDelegateFactory.CreateMethodCall<object>(getMemberMethod);
MethodInfo setMemberMethod = binderType.GetMethod("SetMember", new[] { csharpBinderFlagsType, typeof(string), typeof(Type), csharpArgumentInfoTypeEnumerableType });
_setMemberCall = JsonTypeReflector.ReflectionDelegateFactory.CreateMethodCall<object>(setMemberMethod);
}
#endif
public static CallSiteBinder GetMember(string name, Type context)
{
#if !(PORTABLE)
Init();
return (CallSiteBinder)_getMemberCall(null, 0, name, context, _getCSharpArgumentInfoArray);
#else
return Binder.GetMember(
CSharpBinderFlags.None, name, context, new[] {CSharpArgumentInfo.Create(CSharpArgumentInfoFlags.None, null)});
#endif
}
public static CallSiteBinder SetMember(string name, Type context)
{
#if !(PORTABLE)
Init();
return (CallSiteBinder)_setMemberCall(null, 0, name, context, _setCSharpArgumentInfoArray);
#else
return Binder.SetMember(
CSharpBinderFlags.None, name, context, new[]
{
CSharpArgumentInfo.Create(CSharpArgumentInfoFlags.UseCompileTimeType, null),
CSharpArgumentInfo.Create(CSharpArgumentInfoFlags.Constant, null)
});
#endif
}
}
public static IEnumerable<string> GetDynamicMemberNames(this IDynamicMetaObjectProvider dynamicProvider)
{
DynamicMetaObject metaObject = dynamicProvider.GetMetaObject(Expression.Constant(dynamicProvider));
return metaObject.GetDynamicMemberNames();
}
}
internal class NoThrowGetBinderMember : GetMemberBinder
{
private readonly GetMemberBinder _innerBinder;
public NoThrowGetBinderMember(GetMemberBinder innerBinder)
: base(innerBinder.Name, innerBinder.IgnoreCase)
{
_innerBinder = innerBinder;
}
public override DynamicMetaObject FallbackGetMember(DynamicMetaObject target, DynamicMetaObject errorSuggestion)
{
DynamicMetaObject retMetaObject = _innerBinder.Bind(target, new DynamicMetaObject[] { });
NoThrowExpressionVisitor noThrowVisitor = new NoThrowExpressionVisitor();
Expression resultExpression = noThrowVisitor.Visit(retMetaObject.Expression);
DynamicMetaObject finalMetaObject = new DynamicMetaObject(resultExpression, retMetaObject.Restrictions);
return finalMetaObject;
}
}
internal class NoThrowSetBinderMember : SetMemberBinder
{
private readonly SetMemberBinder _innerBinder;
public NoThrowSetBinderMember(SetMemberBinder innerBinder)
: base(innerBinder.Name, innerBinder.IgnoreCase)
{
_innerBinder = innerBinder;
}
public override DynamicMetaObject FallbackSetMember(DynamicMetaObject target, DynamicMetaObject value, DynamicMetaObject errorSuggestion)
{
DynamicMetaObject retMetaObject = _innerBinder.Bind(target, new DynamicMetaObject[] { value });
NoThrowExpressionVisitor noThrowVisitor = new NoThrowExpressionVisitor();
Expression resultExpression = noThrowVisitor.Visit(retMetaObject.Expression);
DynamicMetaObject finalMetaObject = new DynamicMetaObject(resultExpression, retMetaObject.Restrictions);
return finalMetaObject;
}
}
internal class NoThrowExpressionVisitor : ExpressionVisitor
{
internal static readonly object ErrorResult = new object();
protected override Expression VisitConditional(ConditionalExpression node)
{
// if the result of a test is to throw an error, rewrite to result an error result value
if (node.IfFalse.NodeType == ExpressionType.Throw)
return Expression.Condition(node.Test, node.IfTrue, Expression.Constant(ErrorResult));
return base.VisitConditional(node);
}
}
}
#endif
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