/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation.
*
* This source code is subject to terms and conditions of the Microsoft Public License. A
* copy of the license can be found in the License.html file at the root of this distribution. If
* you cannot locate the Microsoft Public License, please send an email to
* dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound
* by the terms of the Microsoft Public License.
*
* You must not remove this notice, or any other, from this software.
*
*
* ***************************************************************************/
using System; using Microsoft;
#if !SILVERLIGHT
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
#if CODEPLEX_40
using System.Linq.Expressions;
#else
using Microsoft.Linq.Expressions;
#endif
using System.Security;
using System.Security.Permissions;
#if CODEPLEX_40
[assembly: SuppressMessage("Microsoft.Design", "CA1020:AvoidNamespacesWithFewTypes", Scope = "namespace", Target = "System.Dynamic")]
#else
[assembly: SuppressMessage("Microsoft.Design", "CA1020:AvoidNamespacesWithFewTypes", Scope = "namespace", Target = "Microsoft.Scripting")]
#endif
#if CODEPLEX_40
namespace System.Dynamic{
#else
namespace Microsoft.Scripting {
#endif
/// <summary>
/// Provides helper methods to bind COM objects dynamically.
/// </summary>
#if MICROSOFT_DYNAMIC
public
#else
internal
#endif
static class ComBinder {
/// <summary>
/// Determines if an object is a COM object.
/// </summary>
/// <param name="value">The object to test.</param>
/// <returns>true if the object is a COM object, false otherwise.</returns>
public static bool IsComObject(object value) {
return ComObject.IsComObject(value);
}
/// <summary>
/// Tries to perform binding of the dynamic get member operation.
/// </summary>
/// <param name="binder">An instance of the <see cref="GetMemberBinder"/> that represents the details of the dynamic operation.</param>
/// <param name="instance">The target of the dynamic operation. </param>
/// <param name="result">The new <see cref="DynamicMetaObject"/> representing the result of the binding.</param>
/// <param name="delayInvocation">true if member evaluation may be delayed.</param>
/// <returns>true if operation was bound successfully; otherwise, false.</returns>
#if CLR2
[SecurityCritical, SecurityTreatAsSafe]
#else
[SecuritySafeCritical]
#endif
public static bool TryBindGetMember(GetMemberBinder binder, DynamicMetaObject instance, out DynamicMetaObject result, bool delayInvocation) {
ContractUtils.RequiresNotNull(binder, "binder");
ContractUtils.RequiresNotNull(instance, "instance");
if (TryGetMetaObject(ref instance)) {
//
// Demand Full Trust to proceed with the binding.
//
new PermissionSet(PermissionState.Unrestricted).Demand();
var comGetMember = new ComGetMemberBinder(binder, delayInvocation);
result = instance.BindGetMember(comGetMember);
if (result.Expression.Type.IsValueType) {
result = new DynamicMetaObject(
Expression.Convert(result.Expression, typeof(object)),
result.Restrictions
);
}
return true;
} else {
result = null;
return false;
}
}
/// <summary>
/// Tries to perform binding of the dynamic get member operation.
/// </summary>
/// <param name="binder">An instance of the <see cref="GetMemberBinder"/> that represents the details of the dynamic operation.</param>
/// <param name="instance">The target of the dynamic operation. </param>
/// <param name="result">The new <see cref="DynamicMetaObject"/> representing the result of the binding.</param>
/// <returns>true if operation was bound successfully; otherwise, false.</returns>
public static bool TryBindGetMember(GetMemberBinder binder, DynamicMetaObject instance, out DynamicMetaObject result) {
return TryBindGetMember(binder, instance, out result, false);
}
/// <summary>
/// Tries to perform binding of the dynamic set member operation.
/// </summary>
/// <param name="binder">An instance of the <see cref="SetMemberBinder"/> that represents the details of the dynamic operation.</param>
/// <param name="instance">The target of the dynamic operation.</param>
/// <param name="value">The <see cref="DynamicMetaObject"/> representing the value for the set member operation.</param>
/// <param name="result">The new <see cref="DynamicMetaObject"/> representing the result of the binding.</param>
/// <returns>true if operation was bound successfully; otherwise, false.</returns>
#if CLR2
[SecurityCritical, SecurityTreatAsSafe]
#else
[SecuritySafeCritical]
#endif
public static bool TryBindSetMember(SetMemberBinder binder, DynamicMetaObject instance, DynamicMetaObject value, out DynamicMetaObject result) {
ContractUtils.RequiresNotNull(binder, "binder");
ContractUtils.RequiresNotNull(instance, "instance");
ContractUtils.RequiresNotNull(value, "value");
if (TryGetMetaObject(ref instance)) {
//
// Demand Full Trust to proceed with the binding.
//
new PermissionSet(PermissionState.Unrestricted).Demand();
result = instance.BindSetMember(binder, value);
return true;
} else {
result = null;
return false;
}
}
/// <summary>
/// Tries to perform binding of the dynamic invoke operation.
/// </summary>
/// <param name="binder">An instance of the <see cref="InvokeBinder"/> that represents the details of the dynamic operation.</param>
/// <param name="instance">The target of the dynamic operation. </param>
/// <param name="args">An array of <see cref="DynamicMetaObject"/> instances - arguments to the invoke member operation.</param>
/// <param name="result">The new <see cref="DynamicMetaObject"/> representing the result of the binding.</param>
/// <returns>true if operation was bound successfully; otherwise, false.</returns>
#if CLR2
[SecurityCritical, SecurityTreatAsSafe]
#else
[SecuritySafeCritical]
#endif
public static bool TryBindInvoke(InvokeBinder binder, DynamicMetaObject instance, DynamicMetaObject[] args, out DynamicMetaObject result) {
ContractUtils.RequiresNotNull(binder, "binder");
ContractUtils.RequiresNotNull(instance, "instance");
ContractUtils.RequiresNotNull(args, "args");
if (TryGetMetaObject(ref instance)) {
//
// Demand Full Trust to proceed with the binding.
//
new PermissionSet(PermissionState.Unrestricted).Demand();
result = instance.BindInvoke(binder, args);
return true;
} else {
result = null;
return false;
}
}
/// <summary>
/// Tries to perform binding of the dynamic invoke member operation.
/// </summary>
/// <param name="binder">An instance of the <see cref="InvokeMemberBinder"/> that represents the details of the dynamic operation.</param>
/// <param name="instance">The target of the dynamic operation. </param>
/// <param name="args">An array of <see cref="DynamicMetaObject"/> instances - arguments to the invoke member operation.</param>
/// <param name="result">The new <see cref="DynamicMetaObject"/> representing the result of the binding.</param>
/// <returns>true if operation was bound successfully; otherwise, false.</returns>
#if CLR2
[SecurityCritical, SecurityTreatAsSafe]
#else
[SecuritySafeCritical]
#endif
public static bool TryBindInvokeMember(InvokeMemberBinder binder, DynamicMetaObject instance, DynamicMetaObject[] args, out DynamicMetaObject result) {
ContractUtils.RequiresNotNull(binder, "binder");
ContractUtils.RequiresNotNull(instance, "instance");
ContractUtils.RequiresNotNull(args, "args");
if (TryGetMetaObject(ref instance)) {
//
// Demand Full Trust to proceed with the binding.
//
new PermissionSet(PermissionState.Unrestricted).Demand();
result = instance.BindInvokeMember(binder, args);
return true;
} else {
result = null;
return false;
}
}
/// <summary>
/// Tries to perform binding of the dynamic get index operation.
/// </summary>
/// <param name="binder">An instance of the <see cref="GetIndexBinder"/> that represents the details of the dynamic operation.</param>
/// <param name="instance">The target of the dynamic operation. </param>
/// <param name="args">An array of <see cref="DynamicMetaObject"/> instances - arguments to the invoke member operation.</param>
/// <param name="result">The new <see cref="DynamicMetaObject"/> representing the result of the binding.</param>
/// <returns>true if operation was bound successfully; otherwise, false.</returns>
#if CLR2
[SecurityCritical, SecurityTreatAsSafe]
#else
[SecuritySafeCritical]
#endif
public static bool TryBindGetIndex(GetIndexBinder binder, DynamicMetaObject instance, DynamicMetaObject[] args, out DynamicMetaObject result) {
ContractUtils.RequiresNotNull(binder, "binder");
ContractUtils.RequiresNotNull(instance, "instance");
ContractUtils.RequiresNotNull(args, "args");
if (TryGetMetaObject(ref instance)) {
//
// Demand Full Trust to proceed with the binding.
//
new PermissionSet(PermissionState.Unrestricted).Demand();
result = instance.BindGetIndex(binder, args);
return true;
} else {
result = null;
return false;
}
}
/// <summary>
/// Tries to perform binding of the dynamic set index operation.
/// </summary>
/// <param name="binder">An instance of the <see cref="SetIndexBinder"/> that represents the details of the dynamic operation.</param>
/// <param name="instance">The target of the dynamic operation. </param>
/// <param name="args">An array of <see cref="DynamicMetaObject"/> instances - arguments to the invoke member operation.</param>
/// <param name="value">The <see cref="DynamicMetaObject"/> representing the value for the set index operation.</param>
/// <param name="result">The new <see cref="DynamicMetaObject"/> representing the result of the binding.</param>
/// <returns>true if operation was bound successfully; otherwise, false.</returns>
#if CLR2
[SecurityCritical, SecurityTreatAsSafe]
#else
[SecuritySafeCritical]
#endif
public static bool TryBindSetIndex(SetIndexBinder binder, DynamicMetaObject instance, DynamicMetaObject[] args, DynamicMetaObject value, out DynamicMetaObject result) {
ContractUtils.RequiresNotNull(binder, "binder");
ContractUtils.RequiresNotNull(instance, "instance");
ContractUtils.RequiresNotNull(args, "args");
ContractUtils.RequiresNotNull(value, "value");
if (TryGetMetaObject(ref instance)) {
//
// Demand Full Trust to proceed with the binding.
//
new PermissionSet(PermissionState.Unrestricted).Demand();
result = instance.BindSetIndex(binder, args, value);
return true;
} else {
result = null;
return false;
}
}
/// <summary>
/// Tries to perform binding of the dynamic Convert operation.
/// </summary>
/// <param name="binder">An instance of the <see cref="ConvertBinder"/> that represents the details of the dynamic operation.</param>
/// <param name="instance">The target of the dynamic operation.</param>
/// <param name="result">The new <see cref="DynamicMetaObject"/> representing the result of the binding.</param>
/// <returns>true if operation was bound successfully; otherwise, false.</returns>
#if CLR2
[SecurityCritical, SecurityTreatAsSafe]
#else
[SecuritySafeCritical]
#endif
public static bool TryConvert(ConvertBinder binder, DynamicMetaObject instance, out DynamicMetaObject result) {
ContractUtils.RequiresNotNull(binder, "binder");
ContractUtils.RequiresNotNull(instance, "instance");
if (IsComObject(instance.Value)) {
//
// Demand Full Trust to proceed with the binding.
//
new PermissionSet(PermissionState.Unrestricted).Demand();
// Converting a COM object to any interface is always considered possible - it will result in
// a QueryInterface at runtime
if (binder.Type.IsInterface) {
result = new DynamicMetaObject(
Expression.Convert(
instance.Expression,
binder.Type
),
BindingRestrictions.GetExpressionRestriction(
Expression.Call(
typeof(ComObject).GetMethod("IsComObject", System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.NonPublic),
Helpers.Convert(instance.Expression, typeof(object))
)
)
);
return true;
}
}
result = null;
return false;
}
/// <summary>
/// Gets the member names associated with the object.
/// This function can operate only with objects for which <see cref="IsComObject"/> returns true.
/// </summary>
/// <param name="value">The object for which member names are requested.</param>
/// <returns>The collection of member names.</returns>
#if CLR2
[SecurityCritical, SecurityTreatAsSafe]
#else
[SecuritySafeCritical]
#endif
public static IEnumerable<string> GetDynamicMemberNames(object value) {
ContractUtils.RequiresNotNull(value, "value");
ContractUtils.Requires(IsComObject(value), "value", Strings.ComObjectExpected);
//
// Demand Full Trust to proceed with the binding.
//
new PermissionSet(PermissionState.Unrestricted).Demand();
return ComObject.ObjectToComObject(value).GetMemberNames(false);
}
/// <summary>
/// Gets the member names of the data-like members associated with the object.
/// This function can operate only with objects for which <see cref="IsComObject"/> returns true.
/// </summary>
/// <param name="value">The object for which member names are requested.</param>
/// <returns>The collection of member names.</returns>
#if CLR2
[SecurityCritical, SecurityTreatAsSafe]
#else
[SecuritySafeCritical]
#endif
[SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
internal static IList<string> GetDynamicDataMemberNames(object value) {
ContractUtils.RequiresNotNull(value, "value");
ContractUtils.Requires(IsComObject(value), "value", Strings.ComObjectExpected);
//
// Demand Full Trust to proceed with the binding.
//
new PermissionSet(PermissionState.Unrestricted).Demand();
return ComObject.ObjectToComObject(value).GetMemberNames(true);
}
/// <summary>
/// Gets the data-like members and associated data for an object.
/// This function can operate only with objects for which <see cref="IsComObject"/> returns true.
/// </summary>
/// <param name="value">The object for which data members are requested.</param>
/// <param name="names">The enumeration of names of data members for which to retrieve values.</param>
/// <returns>The collection of pairs that represent data member's names and their data.</returns>
[SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
[SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
#if CLR2
[SecurityCritical, SecurityTreatAsSafe]
#else
[SecuritySafeCritical]
#endif
internal static IList<KeyValuePair<string, object>> GetDynamicDataMembers(object value, IEnumerable<string> names) {
ContractUtils.RequiresNotNull(value, "value");
ContractUtils.Requires(IsComObject(value), "value", Strings.ComObjectExpected);
//
// Demand Full Trust to proceed with the binding.
//
new PermissionSet(PermissionState.Unrestricted).Demand();
return ComObject.ObjectToComObject(value).GetMembers(names);
}
private static bool TryGetMetaObject(ref DynamicMetaObject instance) {
// If we're already a COM MO don't make a new one
// (we do this to prevent recursion if we call Fallback from COM)
if (instance is ComUnwrappedMetaObject) {
return false;
}
if (IsComObject(instance.Value)) {
instance = new ComMetaObject(instance.Expression, instance.Restrictions, instance.Value);
return true;
}
return false;
}
/// <summary>
/// Special binder that indicates special semantics for COM GetMember operation.
/// </summary>
internal class ComGetMemberBinder : GetMemberBinder {
private readonly GetMemberBinder _originalBinder;
internal bool _CanReturnCallables;
internal ComGetMemberBinder(GetMemberBinder originalBinder, bool CanReturnCallables) :
base(originalBinder.Name, originalBinder.IgnoreCase) {
_originalBinder = originalBinder;
_CanReturnCallables = CanReturnCallables;
}
public override DynamicMetaObject FallbackGetMember(DynamicMetaObject target, DynamicMetaObject errorSuggestion) {
return _originalBinder.FallbackGetMember(target, errorSuggestion);
}
public override int GetHashCode() {
return _originalBinder.GetHashCode() ^ (_CanReturnCallables ? 1 : 0);
}
public override bool Equals(object obj) {
ComGetMemberBinder other = obj as ComGetMemberBinder;
return other != null &&
_CanReturnCallables == other._CanReturnCallables &&
_originalBinder.Equals(other._originalBinder);
}
}
}
}
#endif
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