class ActionDispatch::Routing::Mapper

def self.normalize_name(name) 

def self.normalize_name(name)
  normalize_path(name)[1..-1].gsub("/", "_")
end

def self.normalize_path(path)

for root cases, where the latter is the correct one.
(:locale) becomes (/:locale) instead of /(:locale). Except
Invokes Rack::Mount::Utils.normalize path and ensure that 
def self.normalize_path(path)
  path = Rack::Mount::Utils.normalize_path(path)
  path.gsub!(%r{/(\(+)/?}, '\1/') unless path =~ %r{^/\(+[^/]+\)$}
  path
end