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(.using
 [library
  [lux "*"
   [abstract
    [equivalence {"+" Equivalence}]
    ["[0]" hash {"+" Hash}]]
   [control
    ["[0]" maybe ("[1]#[0]" functor)]]
   [data
    ["[0]" text
     ["%" format {"+" format}]
     ["[0]" encoding {"+" Encoding}]]]
   [type
    [abstract {"-" pattern}]]]]
 [/
  ["[0]" language {"+" Language}]
  ["[0]" territory {"+" Territory}]])

(abstract: .public Locale
  Text

  (def: territory_separator "_")
  (def: encoding_separator ".")

  (def: .public (locale language territory encoding)
    (-> Language (Maybe Territory) (Maybe Encoding) Locale)
    (abstraction (format (language.code language)
                         (|> territory
                             (maybe#each (|>> territory.long_code (format ..territory_separator)))
                             (maybe.else ""))
                         (|> encoding
                             (maybe#each (|>> encoding.name (format ..encoding_separator)))
                             (maybe.else "")))))

  (def: .public code
    (-> Locale Text)
    (|>> representation))

  (def: .public hash
    (Hash Locale)
    (# hash.functor each ..code text.hash))

  (def: .public equivalence
    (Equivalence Locale)
    (# ..hash &equivalence))
  )