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(;module:
lux
(lux (control eq
order
codec
["p" parser]
[monad #+ do])
(data [number "int/" Codec<Text,Int> Number<Int>]
[text "text/" Monoid<Text>]
(text ["l" lexer])
["R" result])
(type model)))
(model: #export Duration
{#;doc "Durations have a resolution of milliseconds."}
Int
(def: #export from-millis
(-> Int Duration)
(|>. @model))
(def: #export to-millis
(-> Duration Int)
(|>. @repr))
(do-template [<name> <op>]
[(def: #export (<name> param subject)
(-> Duration Duration Duration)
(@model (<op> (@repr param) (@repr subject))))]
[merge i.+]
[frame i.%]
)
(def: #export (scale scalar duration)
(-> Int Duration Duration)
(@model (i.* scalar (@repr duration))))
(def: #export (query param subject)
(-> Duration Duration Int)
(i./ (@repr param) (@repr subject)))
(struct: #export _ (Eq Duration)
(def: (= param subject)
(i.= (@repr param) (@repr subject))))
(struct: #export _ (Order Duration)
(def: eq Eq<Duration>)
(do-template [<name> <op>]
[(def: (<name> param subject)
(<op> (@repr param) (@repr subject)))]
[< i.<]
[<= i.<=]
[> i.>]
[>= i.>=]
))
(do-template [<name> <op>]
[(def: #export (<name> duration)
(-> Duration Bool)
(<op> 0 (@repr 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 (from-millis 1_000))
(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))
(def: (encode duration)
(-> Duration Text)
(if (:: Eq<Duration> = empty duration)
"0ms"
(let [signed? (negative? duration)
[hours time-left] [(query hour duration) (frame hour duration)]
hours (if signed?
(int/abs hours)
hours)
time-left (if signed?
(scale -1 time-left)
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/append
(if signed? "-" "")
(if (i.= 0 hours) "" (text/append (int/encode hours) "h"))
(if (i.= 0 minutes) "" (text/append (int/encode minutes) "m"))
(if (i.= 0 seconds) "" (text/append (int/encode seconds) "s"))
(if (i.= 0 millis) "" (text/append (int/encode millis) "ms"))
))))
(def: (lex-section suffix)
(-> Text (l;Lexer Int))
(|> (l;codec number;Codec<Text,Int> (l;many l;decimal))
(p;before (l;this suffix))
(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-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-hour) hour))
(merge (scale (sign utc-minute) minute))
(merge (scale (sign utc-second) second))
(merge (scale (sign utc-millis) milli))))))
(def: (decode input)
(-> Text (R;Result Duration))
(l;run input lex-duration))
(struct: #export _
{#;doc "Based on ISO 8601.
For example: 21h14m51s827ms"}
(Codec Text Duration)
(def: encode encode)
(def: decode decode))
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