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(;module:
lux
(lux (control eq
order
enum
codec
["p" parser]
[monad #+ do])
(data ["E" error]
[maybe]
[number "int/" Codec<Text,Int>]
[text "text/" Monoid<Text>]
(text ["l" lexer])
(coll [sequence #+ Sequence sequence]))))
(type: #export Year Int)
(type: #export Month
#January
#February
#March
#April
#May
#June
#July
#August
#September
#October
#November
#December)
(struct: #export _ (Eq Month)
(def: (= reference sample)
(case [reference sample]
(^template [<tag>]
[<tag> <tag>]
true)
([#January]
[#February]
[#March]
[#April]
[#May]
[#June]
[#July]
[#August]
[#September]
[#October]
[#November]
[#December])
_
false)))
(def: (month-to-nat month)
(-> Month Nat)
(case month
#January +0
#February +1
#March +2
#April +3
#May +4
#June +5
#July +6
#August +7
#September +8
#October +9
#November +10
#December +11))
(struct: #export _ (Order Month)
(def: eq Eq<Month>)
(do-template [<name> <comp>]
[(def: (<name> reference sample)
(<comp> (month-to-nat reference) (month-to-nat sample)))]
[< n.<]
[<= n.<=]
[> n.>]
[>= n.>=]
))
(struct: #export _ (Enum Month)
(def: order Order<Month>)
(def: (succ month)
(case month
#January #February
#February #March
#March #April
#April #May
#May #June
#June #July
#July #August
#August #September
#September #October
#October #November
#November #December
#December #January))
(def: (pred month)
(case month
#February #January
#March #February
#April #March
#May #April
#June #May
#July #June
#August #July
#September #August
#October #September
#November #October
#December #November
#January #December)))
(type: #export Day
#Sunday
#Monday
#Tuesday
#Wednesday
#Thursday
#Friday
#Saturday)
(struct: #export _ (Eq Day)
(def: (= reference sample)
(case [reference sample]
(^template [<tag>]
[<tag> <tag>]
true)
([#Sunday]
[#Monday]
[#Tuesday]
[#Wednesday]
[#Thursday]
[#Friday]
[#Saturday])
_
false)))
(def: (day-to-nat day)
(-> Day Nat)
(case day
#Sunday +0
#Monday +1
#Tuesday +2
#Wednesday +3
#Thursday +4
#Friday +5
#Saturday +6))
(struct: #export _ (Order Day)
(def: eq Eq<Day>)
(do-template [<name> <comp>]
[(def: (<name> reference sample)
(<comp> (day-to-nat reference) (day-to-nat sample)))]
[< n.<]
[<= n.<=]
[> n.>]
[>= n.>=]
))
(struct: #export _ (Enum Day)
(def: order Order<Day>)
(def: (succ day)
(case day
#Sunday #Monday
#Monday #Tuesday
#Tuesday #Wednesday
#Wednesday #Thursday
#Thursday #Friday
#Friday #Saturday
#Saturday #Sunday))
(def: (pred day)
(case day
#Monday #Sunday
#Tuesday #Monday
#Wednesday #Tuesday
#Thursday #Wednesday
#Friday #Thursday
#Saturday #Friday
#Sunday #Saturday)))
(type: #export Date
{#year Year
#month Month
#day Nat})
(struct: #export _ (Eq Date)
(def: (= reference sample)
(and (i.= (get@ #year reference)
(get@ #year sample))
(:: Eq<Month> =
(get@ #month reference)
(get@ #month sample))
(n.= (get@ #day reference)
(get@ #day sample)))))
(def: (date.< reference sample)
(-> Date Date Bool)
(or (i.< (get@ #year reference)
(get@ #year sample))
(:: Order<Month> <
(get@ #month reference)
(get@ #month sample))
(n.< (get@ #day reference)
(get@ #day sample))))
(struct: #export _ (Order Date)
(def: eq Eq<Date>)
(def: < date.<)
(def: (> reference sample)
(date.< sample reference))
(def: (<= reference sample)
(or (date.< reference sample)
(:: Eq<Date> = reference sample)))
(def: (>= reference sample)
(or (date.< sample reference)
(:: Eq<Date> = sample reference))))
## Based on this: https://stackoverflow.com/a/42936293/6823464
(def: (pad value)
(-> Int Text)
(if (i.< 10 value)
(text/compose "0" (int/encode value))
(int/encode value)))
(def: (encode [year month day])
(-> Date Text)
($_ text/compose
(int/encode year) "-"
(pad (|> month month-to-nat n.inc nat-to-int)) "-"
(pad (|> day nat-to-int))))
(def: lex-year
(l;Lexer Int)
(do p;Monad<Parser>
[sign? (p;maybe (l;this "-"))
raw-year (p;codec number;Codec<Text,Int> (l;many l;decimal))
#let [signum (case sign?
#;None 1
(#;Some _) -1)]]
(wrap (i.* signum raw-year))))
(def: lex-section
(l;Lexer Int)
(p;codec number;Codec<Text,Int> (l;exactly +2 l;decimal)))
(def: (leap-years year)
(-> Int Int)
(|> (i./ 4 year)
(i.- (i./ 100 year))
(i.+ (i./ 400 year))))
(def: normal-months
(Sequence Nat)
(sequence +31 +28 +31
+30 +31 +30
+31 +31 +30
+31 +30 +31))
(def: leap-year-months
(Sequence Nat)
(sequence;update [+1] n.inc normal-months))
(def: (divisible? factor input)
(-> Int Int Bool)
(|> input (i.% factor) (i.= 0)))
(def: (leap-year? year)
(-> Int Bool)
(and (divisible? 4 year)
(or (not (divisible? 100 year))
(divisible? 400 year))))
## Based on: https://stackoverflow.com/a/3309340/6823464
(def: lex-date
(l;Lexer Date)
(do p;Monad<Parser>
[utc-year lex-year
_ (l;this "-")
utc-month lex-section
_ (p;assert "Invalid month."
(and (i.>= 1 utc-month)
(i.<= 12 utc-month)))
#let [months (if (leap-year? utc-year)
leap-year-months
normal-months)
month-days (|> months
(sequence;nth (int-to-nat (i.dec utc-month)))
maybe;assume)]
_ (l;this "-")
utc-day lex-section
_ (p;assert "Invalid day."
(and (i.>= 1 utc-day)
(i.<= (nat-to-int month-days) utc-day)))]
(wrap {#year utc-year
#month (case utc-month
1 #January
2 #February
3 #March
4 #April
5 #May
6 #June
7 #July
8 #August
9 #September
10 #October
11 #November
12 #December
_ (undefined))
#day (int-to-nat utc-day)})))
(def: (decode input)
(-> Text (E;Error Date))
(l;run input lex-date))
(struct: #export _
{#;doc "Based on ISO 8601.
For example: 2017-01-15"}
(Codec Text Date)
(def: encode encode)
(def: decode decode))
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