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(.module:
  [lux #*
   [control
    [monad (#+ do Monad)]
    ["p" parser]]
   [data
    ["." bit]
    ["." ident]
    ["." number]
    ["." text]
    [format
     ["." xml]
     ["." json]]
    [collection
     [list ("list/." Monad<List>)]]]
   [time
    ["." instant]
    ["." duration]
    ["." date]]
   [math
    ["." modular]]
   ["." macro
    ["." code]
    ["s" syntax (#+ syntax: Syntax)]]
   [language
    ["." type]]])

## [Syntax]
(syntax: #export (format {fragments (p.many s.any)})
  {#.doc (doc "Text interpolation."
              (format "Static part " (%t static) " does not match URI: " uri))}
  (wrap (list (` ($_ "lux text concat" (~+ fragments))))))

## [Formats]
(type: #export (Format a)
  {#.doc "A way to produce readable text from values."}
  (-> a Text))

(do-template [<name> <type> <formatter>]
  [(def: #export <name>
     (Format <type>)
     <formatter>)]

  [%b        Bit               (:: bit.Codec<Text,Bit> encode)]
  [%n        Nat               (:: number.Codec<Text,Nat> encode)]
  [%i        Int               (:: number.Codec<Text,Int> encode)]
  [%r        Rev               (:: number.Codec<Text,Rev> encode)]
  [%f        Frac              (:: number.Codec<Text,Frac> encode)]
  [%t        Text              text.encode]
  [%ident    Ident             (:: ident.Codec<Text,Ident> encode)]
  [%code     Code              code.to-text]
  [%type     Type              type.to-text]
  [%bin      Nat               (:: number.Binary@Codec<Text,Nat> encode)]
  [%oct      Nat               (:: number.Octal@Codec<Text,Nat> encode)]
  [%hex      Nat               (:: number.Hex@Codec<Text,Nat> encode)]
  [%xml      xml.XML           (:: xml.Codec<Text,XML> encode)]
  [%json     json.JSON         (:: json.Codec<Text,JSON> encode)]
  [%instant  instant.Instant   instant.to-text]
  [%duration duration.Duration (:: duration.Codec<Text,Duration> encode)]
  [%date     date.Date         (:: date.Codec<Text,Date> encode)]
  )

(def: #export (%mod modular)
  (All [m] (Format (modular.Mod m)))
  (let [[_ modulus] (modular.un-mod modular)]
    (:: (modular.Codec<Text,Mod> modulus) encode modular)))

(def: #export (%list formatter)
  (All [a] (-> (Format a) (Format (List a))))
  (function (_ values)
    (case values
      #.Nil
      "(list)"

      _
      (format "(list " (text.join-with " " (list/map formatter values)) ")"))))