# File lib/yard/server/doc_server_helper.rb, line 21
      def url_for_file(filename, anchor = nil)
        if filename.is_a?(CodeObjects::ExtraFileObject)
          filename = filename.filename
        end
        "/#{base_path(router.docs_prefix)}/file/" + filename.sub(%r{^#{@library.source_path.to_s}/}, '') +
          (anchor ? "##{anchor}" : "")
      end