class ActionDispatch::Routing::Mapper

def self.normalize_path(path)
  path = Journey::Router::Utils.normalize_path(path)
  # the path for a root URL at this point can be something like
  # "/(/:locale)(/:platform)/(:browser)", and we would want
  # "/(:locale)(/:platform)(/:browser)"
  # reverse "/(", "/((" etc to "(/", "((/" etc
  path.gsub!(%r{/(\(+)/?}, '\1/')
  # if a path is all optional segments, change the leading "(/" back to
  # "/(" so it evaluates to "/" when interpreted with no options.
  # Unless, however, at least one secondary segment consists of a static
  # part, ex. "(/:locale)(/pages/:page)"
  path.sub!(%r{^(\(+)/}, '/\1') if %r{^(\(+[^)]+\))(\(+/:[^)]+\))*$}.match?(path)
  path
end