internal virtual Expression VisitInputReferenceExpression(InputReferenceExpression ire)
{
// Debug.Assert(ire != null, "ire != null -- otherwise caller never should have visited here");
ResourceExpression re = (ResourceExpression)this.Visit(ire.Target);
return(re.CreateReference());
}
internal InputReferenceExpression CreateReference()
{
if (this.inputRef == null)
{
this.inputRef = new InputReferenceExpression(this);
}
return(this.inputRef);
}
internal override Expression VisitInputReferenceExpression(InputReferenceExpression ire)
{
Debug.Assert(ire != null, "ire != null");
if (this.parent == null || this.parent.NodeType != ExpressionType.MemberAccess)
{
string expressionText = (this.parent != null) ? this.parent.ToString() : ire.ToString();
throw new NotSupportedException(string.Format(CultureInfo.CurrentCulture, SR.ALinqCantTranslateExpression, expressionText));
}
return(ire);
}
internal void OverrideInputReference(ResourceSetExpression newInput)
{
Debug.Assert(newInput != null, "Original resource set cannot be null");
Debug.Assert(this.inputRef == null, "OverrideInputReference cannot be called if the target has already been referenced");
InputReferenceExpression inputRef = newInput.inputRef;
if (inputRef != null)
{
this.inputRef = inputRef;
inputRef.OverrideTarget(this);
}
}
internal override Expression VisitMemberAccess(MemberExpression m)
{
if (this.inputSet == null ||
!this.inputSet.HasTransparentScope)
{
return(base.VisitMemberAccess(m));
}
ParameterExpression innerParamRef = null;
Stack <PropertyInfo> nestedAccesses = new Stack <PropertyInfo>();
MemberExpression memberRef = m;
while (memberRef != null &&
memberRef.Member.MemberType == MemberTypes.Property &&
memberRef.Expression != null)
{
nestedAccesses.Push((PropertyInfo)memberRef.Member);
if (memberRef.Expression.NodeType == ExpressionType.Parameter)
{
innerParamRef = (ParameterExpression)memberRef.Expression;
}
memberRef = memberRef.Expression as MemberExpression;
}
if (innerParamRef != this.inputParameter || nestedAccesses.Count == 0)
{
return(m);
}
ResourceExpression target = this.input;
ResourceSetExpression targetSet = this.inputSet;
bool transparentScopeTraversed = false;
while (nestedAccesses.Count > 0)
{
if (targetSet == null || !targetSet.HasTransparentScope)
{
break;
}
PropertyInfo currentProp = nestedAccesses.Peek();
if (currentProp.Name.Equals(targetSet.TransparentScope.Accessor, StringComparison.Ordinal))
{
target = targetSet;
nestedAccesses.Pop();
transparentScopeTraversed = true;
continue;
}
Expression source;
if (!targetSet.TransparentScope.SourceAccessors.TryGetValue(currentProp.Name, out source))
{
break;
}
transparentScopeTraversed = true;
nestedAccesses.Pop();
Debug.Assert(source != null, "source != null -- otherwise ResourceBinder created an accessor to nowhere");
InputReferenceExpression sourceReference = source as InputReferenceExpression;
if (sourceReference == null)
{
targetSet = source as ResourceSetExpression;
if (targetSet == null || !targetSet.HasTransparentScope)
{
target = (ResourceExpression)source;
}
}
else
{
targetSet = sourceReference.Target as ResourceSetExpression;
target = targetSet;
}
}
if (!transparentScopeTraversed)
{
return(m);
}
Expression result = this.CreateReference(target);
while (nestedAccesses.Count > 0)
{
result = Expression.Property(result, nestedAccesses.Pop());
}
return(result);
}
