class ActionDispatch::Routing::RoutesInspector

def format(formatter, filter = {})
  routes_to_display = filter_routes(normalize_filter(filter))
  routes = collect_routes(routes_to_display)
  if routes.none?
    formatter.no_routes(collect_routes(@routes), filter)
    return formatter.result
  end
  formatter.header routes
  formatter.section routes
  @engines.each do |name, engine_routes|
    formatter.section_title "Routes for #{name}"
    formatter.section engine_routes
  end
  formatter.result
end