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|
(.module:
[lux #*
["@" target]
[abstract
[equivalence (#+ Equivalence)]
[order (#+ Order)]
[enum (#+ Enum)]
[codec (#+ Codec)]
[monad (#+ Monad do)]]
[control
[io (#+ IO io)]
["." try]
["." exception (#+ exception:)]
["<>" parser
["<.>" text (#+ Parser)]]]
[data
["." maybe]
["." text ("#\." monoid)]
[collection
["." row]]]
[math
[number
["i" int]
["f" frac]]]
[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))
(implementation: #export equivalence
(Equivalence Instant)
(def: (= param subject)
(\ i.equivalence = (:representation param) (:representation subject))))
(implementation: #export order
(Order Instant)
(def: &equivalence ..equivalence)
(def: (< param subject)
(\ i.order < (:representation param) (:representation subject))))
(`` (implementation: #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: (split_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] (..split_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.to_days date.parser)
_ (<text>.this ..date_suffix)
time (\ ! map //.to_millis //.parser)
_ (<text>.this ..time_suffix)]
(wrap (|> (if (i.< +0 days)
(|> duration.day
(duration.up (.nat (i.* -1 days)))
duration.inverse)
(duration.up (.nat days) duration.day))
(duration.merge (duration.up time duration.milli_second))
..absolute))))
(implementation: #export codec
{#.doc (doc "Based on ISO 8601."
"For example: 2017-01-15T21:14:51.827Z")}
(Codec Text Instant)
(def: encode ..encode)
(def: decode (<text>.run ..parser)))
(def: #export now
(IO Instant)
(io (..from_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: #export (<field> instant)
(-> Instant <type>)
(let [[date time] (..split_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))))
(def: #export (from_date_time date time)
(-> Date Time Instant)
(|> (date.to_days date)
(i.* (duration.to_millis duration.day))
(i.+ (.int (//.to_millis time)))
..from_millis))
|
