private static ITypeName GetName(this ITypeElement typeElem,
ISubstitution substitution,
IDictionary <DeclaredElementInstance, IName> seenElems)
{
if (typeElem == null)
{
return(Names.UnknownType);
}
var name = typeElem.GetSimplePredefinedType() ??
IfElementIs <IDelegate>(typeElem, GetName, substitution, seenElems, Names.UnknownDelegateType) ??
IfElementIs <IEnum>(typeElem, GetName, substitution, seenElems, Names.UnknownType) ??
IfElementIs <IInterface>(typeElem, GetName, substitution, seenElems, Names.UnknownType) ??
IfElementIs <IStruct>(typeElem, GetName, substitution, seenElems, Names.UnknownType) ??
Names.Type(typeElem.GetAssemblyQualifiedName(substitution, seenElems));
var dei = new DeclaredElementInstance(typeElem, substitution);
seenElems[dei] = name;
return(name);
}