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(.module:
[lux #*
[control
equivalence
[order (#+ Order)]
codec
[monoid (#+ Monoid)]
["p" parser]
[monad (#+ do)]]
[data
["." number ("nat/." Codec<Text,Nat>) ("int/." Codec<Text,Int> Number<Int>)]
[text ("text/." Monoid<Text>)
["l" lexer]]
["e" error]]
[type
abstract]])
(abstract: #export Duration
{#.doc "Durations have a resolution of milli-seconds."}
Int
(def: #export from-millis
(-> Int Duration)
(|>> :abstraction))
(def: #export to-millis
(-> Duration Int)
(|>> :representation))
(do-template [<name> <op>]
[(def: #export (<name> param subject)
(-> Duration Duration Duration)
(:abstraction (<op> (:representation param) (:representation subject))))]
[merge i/+]
[frame i/%]
)
(do-template [<name> <op>]
[(def: #export (<name> scalar duration)
(-> Int Duration Duration)
(:abstraction (<op> scalar (:representation duration))))]
[scale-up i/*]
[scale-down i//]
)
(def: #export inverse (scale-up -1))
(def: #export (difference from to)
(-> Duration Duration Duration)
(|> from inverse (merge to)))
(def: #export (query param subject)
(-> Duration Duration Int)
(i// (:representation param) (:representation subject)))
(structure: #export _ (Equivalence Duration)
(def: (= param subject)
(i/= (:representation param) (:representation subject))))
(structure: #export _ (Order Duration)
(def: eq Equivalence<Duration>)
(do-template [<name> <op>]
[(def: (<name> param subject)
(<op> (:representation param) (:representation subject)))]
[< i/<]
[<= i/<=]
[> i/>]
[>= i/>=]
))
(open: "duration/." Order<Duration>)
(do-template [<name> <op>]
[(def: #export (<name> left right)
(-> Duration Duration Duration)
(if (<op> left right)
right
left))]
[max duration/>]
[min duration/<]
)
(do-template [<name> <op>]
[(def: #export <name>
(-> Duration Bit)
(|>> :representation (<op> +0)))]
[positive? i/>]
[negative? i/<]
[neutral? i/=]
)
)
(def: #export empty Duration (from-millis +0))
(def: #export milli Duration (from-millis +1))
(def: #export second Duration (scale-up +1_000 milli))
(def: #export minute Duration (scale-up +60 second))
(def: #export hour Duration (scale-up +60 minute))
(def: #export day Duration (scale-up +24 hour))
(def: #export week Duration (scale-up +7 day))
(def: #export normal-year Duration (scale-up +365 day))
(def: #export leap-year Duration (merge day normal-year))
(structure: #export _ (Monoid Duration)
(def: identity empty)
(def: compose merge))
(def: #export (encode duration)
(-> Duration Text)
(if (:: Equivalence<Duration> = empty duration)
"+0ms"
(let [signed? (negative? duration)
[days time-left] [(query day duration) (frame day duration)]
days (if signed?
(int/abs days)
days)
time-left (if signed?
(scale-up -1 time-left)
time-left)
[hours time-left] [(query hour time-left) (frame hour time-left)]
[minutes time-left] [(query minute time-left) (frame minute time-left)]
[seconds time-left] [(query second time-left) (frame second time-left)]
millis (to-millis time-left)]
($_ text/compose
(if signed? "-" "+")
(if (i/= +0 days) "" (text/compose (nat/encode (.nat days)) "D"))
(if (i/= +0 hours) "" (text/compose (nat/encode (.nat hours)) "h"))
(if (i/= +0 minutes) "" (text/compose (nat/encode (.nat minutes)) "m"))
(if (i/= +0 seconds) "" (text/compose (nat/encode (.nat seconds)) "s"))
(if (i/= +0 millis) "" (text/compose (nat/encode (.nat millis)) "ms"))
))))
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