/// <summary>
/// Resolves member accesses that represent transparent scope property accesses to the corresponding resource set,
/// iff the input resource set is enclosed in a transparent scope and the specified MemberExpression represents
/// such a property access.
/// </summary>
/// <param name="m">MemberExpression expression to visit</param>
/// <returns>
/// An InputReferenceExpression if the member access represents a transparent scope property
/// access that can be resolved to a resource set in the path that produces the input resource set;
/// otherwise the same MemberExpression is returned.
/// </returns>
internal override Expression VisitMemberAccess(MemberExpression m)
{
// If the current input resource set is not enclosed in a transparent scope, then this
// MemberExpression cannot represent a valid transparent scope access based on the input parameter.
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 &&
PlatformHelper.IsProperty(memberRef.Member) &&
memberRef.Expression != null)
{
nestedAccesses.Push((PropertyInfo)memberRef.Member);
if (memberRef.Expression.NodeType == ExpressionType.Parameter)
{
innerParamRef = (ParameterExpression)memberRef.Expression;
}
memberRef = memberRef.Expression as MemberExpression;
}
// Only continue if the inner non-MemberExpression is the input reference ParameterExpression and
// at least one property reference is present - otherwise this cannot be a transparent scope access.
if (innerParamRef != this.inputParameter || nestedAccesses.Count == 0)
{
return(m);
}
ResourceExpression target = this.input;
ResourceSetExpression targetSet = this.inputSet;
bool transparentScopeTraversed = false;
// Process all the traversals through transparent scopes.
while (nestedAccesses.Count > 0)
{
if (targetSet == null || !targetSet.HasTransparentScope)
{
break;
}
// Peek the property; pop it once it's consumed
// (it could be a non-transparent-identifier access).
PropertyInfo currentProp = nestedAccesses.Peek();
// If this is the accessor for the target, then the member
// refers to the target itself.
if (currentProp.Name.Equals(targetSet.TransparentScope.Accessor, StringComparison.Ordinal))
{
target = targetSet;
nestedAccesses.Pop();
transparentScopeTraversed = true;
continue;
}
// This member could also be one of the in-scope sources of the target.
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 no traversals were made, the original expression is OK.
if (!transparentScopeTraversed)
{
return(m);
}
// Process traversals after the transparent scope.
Expression result = this.CreateReference(target);
while (nestedAccesses.Count > 0)
{
result = Expression.Property(result, nestedAccesses.Pop());
}
return(result);
}
internal override Expression VisitMemberAccess(MemberExpression m)
{
if ((this.inputSet == null) || !this.inputSet.HasTransparentScope)
{
return(base.VisitMemberAccess(m));
}
ParameterExpression expression = null;
Stack <PropertyInfo> stack = new Stack <PropertyInfo>();
for (MemberExpression expression2 = m; ((expression2 != null) && PlatformHelper.IsProperty(expression2.Member)) && (expression2.Expression != null); expression2 = expression2.Expression as MemberExpression)
{
stack.Push((PropertyInfo)expression2.Member);
if (expression2.Expression.NodeType == ExpressionType.Parameter)
{
expression = (ParameterExpression)expression2.Expression;
}
}
if ((expression != this.inputParameter) || (stack.Count == 0))
{
return(m);
}
ResourceExpression input = this.input;
ResourceSetExpression inputSet = this.inputSet;
bool flag = false;
while (stack.Count > 0)
{
if ((inputSet == null) || !inputSet.HasTransparentScope)
{
break;
}
PropertyInfo info = stack.Peek();
if (info.Name.Equals(inputSet.TransparentScope.Accessor, StringComparison.Ordinal))
{
input = inputSet;
stack.Pop();
flag = true;
}
else
{
Expression expression5;
if (!inputSet.TransparentScope.SourceAccessors.TryGetValue(info.Name, out expression5))
{
break;
}
flag = true;
stack.Pop();
InputReferenceExpression expression6 = expression5 as InputReferenceExpression;
if (expression6 == null)
{
inputSet = expression5 as ResourceSetExpression;
if ((inputSet == null) || !inputSet.HasTransparentScope)
{
input = (ResourceExpression)expression5;
}
continue;
}
inputSet = expression6.Target as ResourceSetExpression;
input = inputSet;
}
}
if (!flag)
{
return(m);
}
Expression expression7 = this.CreateReference(input);
while (stack.Count > 0)
{
expression7 = Expression.Property(expression7, stack.Pop());
}
return(expression7);
}
/// <summary>
/// Create an instance of primitive type from a string representation
/// </summary>
/// <param name="text">The string representation</param>
/// <returns>An instance of primitive type</returns>
internal override object Parse(String text)
{
return(PlatformHelper.ConvertStringToDateTimeOffset(text));
}
internal override object Parse(string text)
{
return(PlatformHelper.GetTypeOrThrow(text));
}
/// <summary>
/// Convert an instance of primitive type to string
/// </summary>
/// <param name="instance">The instance</param>
/// <returns>The string representation of the instance</returns>
internal override string ToString(object instance)
{
return(PlatformHelper.ConvertDateTimeToString((DateTime)instance));
}