Nemerle.VisualStudio.Project.NemerleProjectNode.TryFindParentFileNode C# (CSharp) Method

        private bool TryFindParentFileNode(HierarchyNode root, string child, out HierarchyNode parent)
        {
            parent = null;

            var childName = Path.GetFileName(child);
            var childDirectory = Path.GetDirectoryName(child);

            // the standart layout, used for most file types (aspx, ashx, master, xaml etc)
            // + - page.aspx
            // |   + - page.aspx.n
            // |   + - page.aspx.designer.n
            var parentName = Path.GetFileNameWithoutExtension(childName);
            while (parentName.IndexOf('.') > 0 && parent == null)
            {
                parent = root.FindChild(Path.Combine(childDirectory, parentName));
                parentName = Path.GetFileNameWithoutExtension(parentName);
            }

            if (parent == null)
            {
                // Windows forms layout:
                // + - form.n
                // |   + - form.designer.n

                var childNameWithoutExtension = Path.GetFileNameWithoutExtension(child);

                // look for suffix position (".Designer", etc)
                var suffixIndex = childNameWithoutExtension.LastIndexOf(root.NameRelationSeparator);
                if (suffixIndex < 0)
                    return false;

                parentName = string.Format("{0}.n", childNameWithoutExtension.Substring(0, suffixIndex));

                var parentPath = Path.Combine(childDirectory, parentName);

                parent = root.FindChild(parentPath);
            }

            return parent != null;
        }