/// <summary>
/// Gets the type T specified in [typeOfAttribute(typeof(T))] if specified.
/// </summary>
/// <param name="type">Type possibly having the attribute named "typeofAttribute".</param>
/// <param name="typeOfAttribute">The type of the attribute that has the type T as its argument.</param>
/// <returns>TypeNode for the type specified in the attribute, or null if the attribute is not present.</returns>
internal static TypeNode/*?*/ GetTypeFromAttribute(TypeNode type, TypeNode typeOfAttribute) {
if (type == null) return null;
AttributeNode contractClass = type.GetAttribute(typeOfAttribute);
if (contractClass == null)
return null;
Expression typeExpr = contractClass.GetPositionalArgument(0);
if (typeExpr == null)
return null;
Literal typeLiteral = typeExpr as Literal;
if (typeLiteral == null)
return null;
TypeNode typeNode = typeLiteral.Value as TypeNode;
if (typeNode == null)
return null;
return typeNode;
}