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|
(.module:
[lux #*
[control
equivalence
order
codec
[monoid (#+ Monoid)]
["p" parser]
[monad (#+ do)]]
[data
[number ("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 milliseconds."}
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/%]
)
(def: #export (scale scalar duration)
(-> Int Duration Duration)
(:abstraction (i/* scalar (:representation duration))))
(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/>=]
))
(do-template [<name> <op>]
[(def: #export (<name> duration)
(-> Duration Bit)
(<op> 0 (:representation duration)))]
[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 1_000 milli))
(def: #export minute Duration (scale 60 second))
(def: #export hour Duration (scale 60 minute))
(def: #export day Duration (scale 24 hour))
(def: #export week Duration (scale 7 day))
(def: #export normal-year Duration (scale 365 day))
(def: #export leap-year Duration (merge day normal-year))
(structure: #export _ (Monoid Duration)
(def: identity empty)
(def: compose merge))
(def: (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 -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 (int/encode days) "D"))
(if (i/= 0 hours) "" (text/compose (int/encode hours) "h"))
(if (i/= 0 minutes) "" (text/compose (int/encode minutes) "m"))
(if (i/= 0 seconds) "" (text/compose (int/encode seconds) "s"))
(if (i/= 0 millis) "" (text/compose (int/encode millis) "ms"))
))))
(def: (lex-section suffix)
(-> Text (l.Lexer Int))
(|> (p.codec number.Codec<Text,Int> (l.many l.decimal))
(p.before (p.seq (l.this suffix) (p.not l.alpha)))
(p.default 0)))
(def: lex-duration
(l.Lexer Duration)
(do p.Monad<Parser>
[signed? (l.this? "-")
#let [sign (function (_ raw) (if signed? (i/* -1 raw) raw))]
utc-day (lex-section "D")
utc-hour (lex-section "h")
utc-minute (lex-section "m")
_ (p.assert "Invalid minute."
(and (i/>= 0 utc-minute)
(i/<= 59 utc-minute)))
utc-second (lex-section "s")
_ (p.assert "Invalid second."
(and (i/>= 0 utc-second)
(i/<= 59 utc-second)))
utc-millis (lex-section "ms")
_ (p.assert "Invalid milli-seconds."
(and (i/>= 0 utc-millis)
(i/<= 999 utc-millis)))]
(wrap (|> empty
(merge (scale (sign utc-day) day))
(merge (scale (sign utc-hour) hour))
(merge (scale (sign utc-minute) minute))
(merge (scale (sign utc-second) second))
(merge (scale (sign utc-millis) milli))))))
(def: (decode input)
(-> Text (e.Error Duration))
(l.run input lex-duration))
(structure: #export _
{#.doc "For example: 15D21h14m51s827ms"}
(Codec Text Duration)
(def: encode encode)
(def: decode decode))
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