/* ****************************************************************************
*
* 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 // ComObject
using System.Diagnostics;
#if CODEPLEX_40
using System.Linq.Expressions;
#else
using Microsoft.Linq.Expressions;
#endif
#if CODEPLEX_40
namespace System.Dynamic{
#else
namespace Microsoft.Scripting {
#endif
internal sealed class IDispatchMetaObject : ComFallbackMetaObject {
private readonly IDispatchComObject _self;
internal IDispatchMetaObject(Expression expression, IDispatchComObject self)
: base(expression, BindingRestrictions.Empty, self) {
_self = self;
}
public override DynamicMetaObject BindInvokeMember(InvokeMemberBinder binder, DynamicMetaObject[] args) {
ContractUtils.RequiresNotNull(binder, "binder");
ComMethodDesc method;
if (_self.TryGetMemberMethod(binder.Name, out method) ||
_self.TryGetMemberMethodExplicit(binder.Name, out method)) {
bool[] isByRef = ComBinderHelpers.ProcessArgumentsForCom(ref args);
return BindComInvoke(args, method, binder.CallInfo, isByRef);
}
return base.BindInvokeMember(binder, args);
}
public override DynamicMetaObject BindInvoke(InvokeBinder binder, DynamicMetaObject[] args) {
ContractUtils.RequiresNotNull(binder, "binder");
ComMethodDesc method;
if (_self.TryGetGetItem(out method)) {
bool[] isByRef = ComBinderHelpers.ProcessArgumentsForCom(ref args);
return BindComInvoke(args, method, binder.CallInfo, isByRef);
}
return base.BindInvoke(binder, args);
}
private DynamicMetaObject BindComInvoke(DynamicMetaObject[] args, ComMethodDesc method, CallInfo callInfo, bool[] isByRef) {
return new ComInvokeBinder(
callInfo,
args,
isByRef,
IDispatchRestriction(),
Expression.Constant(method),
Expression.Property(
Helpers.Convert(Expression, typeof(IDispatchComObject)),
typeof(IDispatchComObject).GetProperty("DispatchObject")
),
method
).Invoke();
}
public override DynamicMetaObject BindGetMember(GetMemberBinder binder) {
ComBinder.ComGetMemberBinder comBinder = binder as ComBinder.ComGetMemberBinder;
bool canReturnCallables = comBinder == null ? false : comBinder._CanReturnCallables;
ContractUtils.RequiresNotNull(binder, "binder");
ComMethodDesc method;
ComEventDesc @event;
// 1. Try methods
if (_self.TryGetMemberMethod(binder.Name, out method)) {
return BindGetMember(method, canReturnCallables);
}
// 2. Try events
if (_self.TryGetMemberEvent(binder.Name, out @event)) {
return BindEvent(@event);
}
// 3. Try methods explicitly by name
if (_self.TryGetMemberMethodExplicit(binder.Name, out method)) {
return BindGetMember(method, canReturnCallables);
}
// 4. Fallback
return base.BindGetMember(binder);
}
private DynamicMetaObject BindGetMember(ComMethodDesc method, bool canReturnCallables) {
if (method.IsDataMember) {
if (method.ParamCount == 0) {
return BindComInvoke(DynamicMetaObject.EmptyMetaObjects, method, new CallInfo(0) , new bool[]{});
}
}
// ComGetMemberBinder does not expect callables. Try to call always.
if (!canReturnCallables) {
return BindComInvoke(DynamicMetaObject.EmptyMetaObjects, method, new CallInfo(0), new bool[0]);
}
return new DynamicMetaObject(
Expression.Call(
typeof(ComRuntimeHelpers).GetMethod("CreateDispCallable"),
Helpers.Convert(Expression, typeof(IDispatchComObject)),
Expression.Constant(method)
),
IDispatchRestriction()
);
}
private DynamicMetaObject BindEvent(ComEventDesc @event) {
// BoundDispEvent CreateComEvent(object rcw, Guid sourceIid, int dispid)
Expression result =
Expression.Call(
typeof(ComRuntimeHelpers).GetMethod("CreateComEvent"),
ComObject.RcwFromComObject(Expression),
Expression.Constant(@event.sourceIID),
Expression.Constant(@event.dispid)
);
return new DynamicMetaObject(
result,
IDispatchRestriction()
);
}
public override DynamicMetaObject BindGetIndex(GetIndexBinder binder, DynamicMetaObject[] indexes) {
ContractUtils.RequiresNotNull(binder, "binder");
ComMethodDesc getItem;
if (_self.TryGetGetItem(out getItem)) {
bool[] isByRef = ComBinderHelpers.ProcessArgumentsForCom(ref indexes);
return BindComInvoke(indexes, getItem, binder.CallInfo , isByRef);
}
return base.BindGetIndex(binder, indexes);
}
public override DynamicMetaObject BindSetIndex(SetIndexBinder binder, DynamicMetaObject[] indexes, DynamicMetaObject value) {
ContractUtils.RequiresNotNull(binder, "binder");
ComMethodDesc setItem;
if (_self.TryGetSetItem(out setItem)) {
bool[] isByRef = ComBinderHelpers.ProcessArgumentsForCom(ref indexes);
isByRef = isByRef.AddLast(false);
var result = BindComInvoke(indexes.AddLast(value), setItem, binder.CallInfo, isByRef);
// Make sure to return the value; some languages need it.
return new DynamicMetaObject(
Expression.Block(result.Expression, Expression.Convert(value.Expression, typeof(object))),
result.Restrictions
);
}
return base.BindSetIndex(binder, indexes, value);
}
public override DynamicMetaObject BindSetMember(SetMemberBinder binder, DynamicMetaObject value) {
ContractUtils.RequiresNotNull(binder, "binder");
return
// 1. Check for simple property put
TryPropertyPut(binder, value) ??
// 2. Check for event handler hookup where the put is dropped
TryEventHandlerNoop(binder, value) ??
// 3. Fallback
base.BindSetMember(binder, value);
}
private DynamicMetaObject TryPropertyPut(SetMemberBinder binder, DynamicMetaObject value) {
ComMethodDesc method;
bool holdsNull = value.Value == null && value.HasValue;
if (_self.TryGetPropertySetter(binder.Name, out method, value.LimitType, holdsNull) ||
_self.TryGetPropertySetterExplicit(binder.Name, out method, value.LimitType, holdsNull)) {
BindingRestrictions restrictions = IDispatchRestriction();
Expression dispatch =
Expression.Property(
Helpers.Convert(Expression, typeof(IDispatchComObject)),
typeof(IDispatchComObject).GetProperty("DispatchObject")
);
var result = new ComInvokeBinder(
new CallInfo(1),
new[] { value },
new bool[] { false },
restrictions,
Expression.Constant(method),
dispatch,
method
).Invoke();
// Make sure to return the value; some languages need it.
return new DynamicMetaObject(
Expression.Block(result.Expression, Expression.Convert(value.Expression, typeof(object))),
result.Restrictions
);
}
return null;
}
private DynamicMetaObject TryEventHandlerNoop(SetMemberBinder binder, DynamicMetaObject value) {
ComEventDesc @event;
if (_self.TryGetMemberEvent(binder.Name, out @event) && value.LimitType == typeof(BoundDispEvent)) {
// Drop the event property set.
return new DynamicMetaObject(
Expression.Constant(null),
value.Restrictions.Merge(IDispatchRestriction()).Merge(BindingRestrictions.GetTypeRestriction(value.Expression, typeof(BoundDispEvent)))
);
}
return null;
}
private BindingRestrictions IDispatchRestriction() {
return IDispatchRestriction(Expression, _self.ComTypeDesc);
}
internal static BindingRestrictions IDispatchRestriction(Expression expr, ComTypeDesc typeDesc) {
return BindingRestrictions.GetTypeRestriction(
expr, typeof(IDispatchComObject)
).Merge(
BindingRestrictions.GetExpressionRestriction(
Expression.Equal(
Expression.Property(
Helpers.Convert(expr, typeof(IDispatchComObject)),
typeof(IDispatchComObject).GetProperty("ComTypeDesc")
),
Expression.Constant(typeDesc)
)
)
);
}
protected override ComUnwrappedMetaObject UnwrapSelf() {
return new ComUnwrappedMetaObject(
ComObject.RcwFromComObject(Expression),
IDispatchRestriction(),
_self.RuntimeCallableWrapper
);
}
}
}
#endif
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