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(.module:
[lux #*
[abstract
[equivalence (#+ Equivalence)]
[order (#+ Order)]
[enum (#+ Enum)]
[codec (#+ Codec)]
[monad (#+ Monad do)]]
[control
[io (#+ IO io)]
["." try]
["." exception (#+ exception:)]
["<>" parser
["<t>" text (#+ Parser)]]]
[data
["." maybe]
[number
["i" int]]
["." text ("#\." monoid)]
[collection
["." row]]]
[type
abstract]]
["." // (#+ Time)
["." duration (#+ Duration)]
["." year (#+ Year)]
["." month (#+ Month)]
["." day (#+ Day)]
["." date (#+ Date)]])
(abstract: #export Instant
Int
{#.doc "Instant is defined as milliseconds since the epoch."}
(def: #export from-millis
(-> Int Instant)
(|>> :abstraction))
(def: #export to-millis
(-> Instant Int)
(|>> :representation))
(def: #export (span from to)
(-> Instant Instant Duration)
(duration.from-millis (i.- (:representation from) (:representation to))))
(def: #export (shift duration instant)
(-> Duration Instant Instant)
(:abstraction (i.+ (duration.to-millis duration) (:representation instant))))
(def: #export (relative instant)
(-> Instant Duration)
(|> instant :representation duration.from-millis))
(def: #export (absolute offset)
(-> Duration Instant)
(|> offset duration.to-millis :abstraction))
(structure: #export equivalence
(Equivalence Instant)
(def: (= param subject)
(\ i.equivalence = (:representation param) (:representation subject))))
(structure: #export order
(Order Instant)
(def: &equivalence ..equivalence)
(def: (< param subject)
(\ i.order < (:representation param) (:representation subject))))
(`` (structure: #export enum
(Enum Instant)
(def: &order ..order)
(~~ (template [<name>]
[(def: <name>
(|>> :representation (\ i.enum <name>) :abstraction))]
[succ] [pred]
))))
)
(def: #export epoch
{#.doc "The instant corresponding to 1970-01-01T00:00:00Z"}
Instant
(..from-millis +0))
(def: millis-per-day
(duration.query duration.milli-second duration.day))
(def: (date-time instant)
(-> Instant [Date Duration])
(let [offset (..to-millis instant)
bce? (i.< +0 offset)
[days day-time] (if bce?
(let [[days millis] (i./% ..millis-per-day offset)]
(case millis
+0 [days millis]
_ [(dec days) (i.+ ..millis-per-day millis)]))
(i./% ..millis-per-day offset))]
[(date.from-days days)
(duration.from-millis day-time)]))
(template [<value> <definition>]
[(def: <definition> Text <value>)]
["T" date-suffix]
["Z" time-suffix]
)
(def: (clock-time duration)
(-> Duration Time)
(let [time (if (\ duration.order < duration.empty duration)
(duration.merge duration.day duration)
duration)]
(|> time duration.to-millis .nat //.from-millis try.assume)))
(def: (encode instant)
(-> Instant Text)
(let [[date time] (..date-time instant)
time (..clock-time time)]
($_ text\compose
(\ date.codec encode date) ..date-suffix
(\ //.codec encode time) ..time-suffix)))
(def: parser
(Parser Instant)
(do {! <>.monad}
[days (\ ! map date.days date.parser)
_ (<t>.this ..date-suffix)
time (\ ! map //.to-millis //.parser)
_ (<t>.this ..time-suffix)]
(wrap (|> (if (i.< +0 days)
(|> duration.day
(duration.scale-up (.nat (i.* -1 days)))
duration.inverse)
(duration.scale-up (.nat days) duration.day))
(duration.merge (duration.scale-up time duration.milli-second))
..absolute))))
(structure: #export codec
{#.doc (doc "Based on ISO 8601."
"For example: 2017-01-15T21:14:51.827Z")}
(Codec Text Instant)
(def: encode ..encode)
(def: decode (<t>.run ..parser)))
(def: #export now
(IO Instant)
(io (..from-millis ("lux io current-time"))))
(template [<field> <type> <post-processing>]
[(def: #export (<field> instant)
(-> Instant <type>)
(let [[date time] (..date-time instant)]
(|> <field> <post-processing>)))]
[date Date (|>)]
[time Time ..clock-time]
)
(def: #export (day-of-week instant)
(-> Instant Day)
(let [offset (..relative instant)
days (duration.query duration.day offset)
day-time (duration.frame duration.day offset)
days (if (and (duration.negative? offset)
(not (duration.neutral? day-time)))
(dec 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))))
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