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|
(.module:
[library
[lux "*"
["@" target]
[abstract
[equivalence {"+" [Equivalence]}]
[order {"+" [Order]}]
[enum {"+" [Enum]}]
[codec {"+" [Codec]}]
[monad {"+" [Monad do]}]]
[control
[io {"+" [IO io]}]
["." maybe]
["." try]
["." exception {"+" [exception:]}]
["<>" parser
["<.>" text {"+" [Parser]}]]]
[data
["." text ("#\." monoid)]
[collection
["." row]]]
[math
[number
["i" int]
["f" frac]]]
[type
abstract]]]
["." // {"+" [Time]}
["." duration {"+" [Duration]}]
["." year {"+" [Year]}]
["." month {"+" [Month]}]
["." day {"+" [Day]}]
["." date {"+" [Date]}]])
(abstract: .public Instant
{}
Int
(def: .public of_millis
(-> Int Instant)
(|>> :abstraction))
(def: .public millis
(-> Instant Int)
(|>> :representation))
(def: .public (span from to)
(-> Instant Instant Duration)
(duration.of_millis (i.- (:representation from) (:representation to))))
(def: .public (after duration instant)
(-> Duration Instant Instant)
(:abstraction (i.+ (duration.millis duration) (:representation instant))))
(def: .public (relative instant)
(-> Instant Duration)
(|> instant :representation duration.of_millis))
(def: .public (absolute offset)
(-> Duration Instant)
(|> offset duration.millis :abstraction))
(implementation: .public equivalence
(Equivalence Instant)
(def: (= param subject)
(\ i.equivalence = (:representation param) (:representation subject))))
(implementation: .public order
(Order Instant)
(def: &equivalence ..equivalence)
(def: (< param subject)
(\ i.order < (:representation param) (:representation subject))))
(`` (implementation: .public enum
(Enum Instant)
(def: &order ..order)
(~~ (template [<name>]
[(def: <name>
(|>> :representation (\ i.enum <name>) :abstraction))]
[succ] [pred]
))))
)
(def: .public epoch
Instant
(..of_millis +0))
(def: millis_per_day
(duration.ticks duration.milli_second duration.day))
(def: (date_time instant)
(-> Instant [Date Duration])
(let [offset (..millis instant)
bce? (i.< +0 offset)
[days day_time] (if bce?
(let [[days millis] (i./% ..millis_per_day offset)]
(case millis
+0 [days millis]
_ [(-- days) (i.+ ..millis_per_day millis)]))
(i./% ..millis_per_day offset))]
[(date.of_days days)
(duration.of_millis day_time)]))
(template [<value> <definition>]
[(def: <definition> Text <value>)]
["T" date_suffix]
["Z" time_suffix]
)
(def: (clock_time duration)
(-> Duration Time)
(|> (if (\ duration.order < duration.empty duration)
(duration.merged duration.day duration)
duration)
duration.millis
.nat
//.of_millis
try.trusted))
(def: (format instant)
(-> Instant Text)
(let [[date time] (..date_time instant)
time (..clock_time time)]
($_ text\composite
(\ date.codec encoded date) ..date_suffix
(\ //.codec encoded time) ..time_suffix)))
(def: parser
(Parser Instant)
(do {! <>.monad}
[days (\ ! each date.days date.parser)
_ (<text>.this ..date_suffix)
time (\ ! each //.millis //.parser)
_ (<text>.this ..time_suffix)]
(in (|> (if (i.< +0 days)
(|> duration.day
(duration.up (.nat (i.* -1 days)))
duration.inverse)
(duration.up (.nat days) duration.day))
(duration.merged (duration.up time duration.milli_second))
..absolute))))
(implementation: .public codec
(Codec Text Instant)
(def: encoded ..format)
(def: decoded (<text>.result ..parser)))
(def: .public now
(IO Instant)
(io (..of_millis (for {@.old ("jvm invokestatic:java.lang.System:currentTimeMillis:")
@.jvm (|> ("jvm member invoke static" [] "java.lang.System" "currentTimeMillis" [])
("jvm object cast")
(: (primitive "java.lang.Long"))
(:as Int))
@.js (let [date ("js object new" ("js constant" "Date") [])]
(|> ("js object do" "getTime" date [])
(:as Frac)
"lux f64 i64"))
@.python (let [time ("python import" "time")]
(|> ("python object do" "time" time)
(:as Frac)
(f.* +1,000.0)
"lux f64 i64"))
@.lua (|> ("lua constant" "os.time")
"lua apply"
(:as Int)
(i.* +1,000))
@.ruby (let [% ("ruby constant" "Time")
% ("ruby object do" "now" %)]
(|> ("ruby object do" "to_f" %)
(:as Frac)
(f.* +1,000.0)
"lux f64 i64"))
@.php (|> ("php constant" "time")
"php apply"
(:as Int)
(i.* +1,000))
@.scheme (|> ("scheme constant" "current-second")
(:as Int)
(i.* +1,000)
("scheme apply" ("scheme constant" "exact"))
("scheme apply" ("scheme constant" "truncate")))
@.common_lisp (|> ("common_lisp constant" "get-universal-time")
"common_lisp apply"
(:as Int)
(i.* +1,000))
}))))
(template [<field> <type> <post_processing>]
[(def: .public (<field> instant)
(-> Instant <type>)
(let [[date time] (..date_time instant)]
(|> <field> <post_processing>)))]
[date Date (|>)]
[time Time ..clock_time]
)
(def: .public (day_of_week instant)
(-> Instant Day)
(let [offset (..relative instant)
days (duration.ticks duration.day offset)
day_time (duration.framed duration.day offset)
days (if (and (duration.negative? offset)
(not (duration.neutral? day_time)))
(-- days)
days)
... 1970/01/01 was a Thursday
y1970m0d0 +4]
(case (|> y1970m0d0
(i.+ days) (i.% +7)
... This is done to turn negative days into positive days.
(i.+ +7) (i.% +7))
+0 #day.Sunday
+1 #day.Monday
+2 #day.Tuesday
+3 #day.Wednesday
+4 #day.Thursday
+5 #day.Friday
+6 #day.Saturday
_ (undefined))))
(def: .public (of_date_time date time)
(-> Date Time Instant)
(|> (date.days date)
(i.* (duration.millis duration.day))
(i.+ (.int (//.millis time)))
..of_millis))
|
