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(.module:
[lux #*
[abstract
[monad (#+ do)]
[equivalence (#+ Equivalence)]]
[control
["." try (#+ Try)]
["." exception (#+ exception:)]
["<>" parser
["<.>" text (#+ Parser)]]]
[data
[text
["%" format]]]
[math
[number
["n" nat]
["i" int]]]
[time
["." date ("#\." equivalence)]
["." year]
["." month]]
[type
abstract]])
(def: #export (pad value)
(-> Nat Text)
(if (n.< 10 value)
(%.format "0" (%.nat value))
(%.nat value)))
(def: min_year +1,000)
(def: max_year +9,999)
(exception: #export (year_is_out_of_range {year year.Year})
(exception.report
["Minimum" (%.int ..min_year)]
["Maximum" (%.int ..max_year)]
["Year" (%.int (year.value year))]))
(abstract: #export Date
date.Date
(def: #export epoch
Date
(:abstraction date.epoch))
(def: #export (date raw)
(-> date.Date (Try Date))
(let [year (|> raw date.year year.value)]
(if (and (i.>= ..min_year year)
(i.<= ..max_year year))
(#try.Success (:abstraction raw))
(exception.throw ..year_is_out_of_range [(date.year raw)]))))
(def: #export value
(-> Date date.Date)
(|>> :representation))
(structure: #export equivalence
(Equivalence Date)
(def: (= reference subject)
(date\= (:representation reference)
(:representation subject))))
(def: #export (format value)
(%.Format Date)
(%.format (|> value :representation date.year year.value .nat %.nat)
(|> value :representation date.month month.number ..pad)
(|> value :representation date.day_of_month ..pad)))
(def: #export parser
(Parser Date)
(do <>.monad
[year (<>.codec n.decimal (<text>.exactly 4 <text>.decimal))
year (<>.lift (year.year (.int year)))
month (<>.codec n.decimal (<text>.exactly 2 <text>.decimal))
month (<>.lift (month.by_number month))
day_of_month (<>.codec n.decimal (<text>.exactly 2 <text>.decimal))
date (<>.lift (date.date year month day_of_month))]
(wrap (:abstraction date)))))
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