private static bool IsSupported(string fileName)
        {
            string extension = Path.GetExtension(fileName).ToLowerInvariant();
            string[] allowed = new[] { ".js", ".css", ".html", ".htm", ".less", ".scss", ".coffee", ".iced", ".config", ".cs", "vb" };

            return allowed.Contains(extension);
        }
        protected override bool NotInterestedIn(object subject)
        {
            var interestedIn = new[]
            {
                typeof(Compilation),
                typeof(NamespaceSymbol),
                typeof(ComplexValueSymbol)
            };

            return !(interestedIn.Contains(subject.GetType()))
                   || base.NotInterestedIn(subject);
        }