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(.using
[library
[lux "*"
[abstract
[monad {"+" do}]
[equivalence {"+" Equivalence}]]
[control
["[0]" try {"+" Try}]
["[0]" exception {"+" exception:}]
["<>" parser
["<[0]>" text {"+" Parser}]]]
[data
[text
["%" format]]]
[math
[number
["n" nat]
["i" int]]]
[time
["[0]" date ("[1]#[0]" equivalence)]
["[0]" year]
["[0]" month]]
[type
[abstract {"-" pattern}]]]])
(def: .public (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: .public (year_is_out_of_range [year year.Year])
(exception.report
"Minimum" (%.int ..min_year)
"Maximum" (%.int ..max_year)
"Year" (%.int (year.value year))))
(abstract: .public Date
date.Date
(def: .public epoch
Date
(abstraction date.epoch))
(def: .public (date raw)
(-> date.Date (Try Date))
(let [year (|> raw date.year year.value)]
(if (or (i.< ..min_year year)
(i.> ..max_year year))
(exception.except ..year_is_out_of_range [(date.year raw)])
{try.#Success (abstraction raw)})))
(def: .public value
(-> Date date.Date)
(|>> representation))
(implementation: .public equivalence
(Equivalence Date)
(def: (= reference subject)
(date#= (representation reference)
(representation subject))))
(def: .public (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: .public parser
(Parser Date)
(do <>.monad
[year (<>.codec n.decimal (<text>.exactly 4 <text>.decimal))
year (<>.lifted (year.year (.int year)))
month (<>.codec n.decimal (<text>.exactly 2 <text>.decimal))
month (<>.lifted (month.by_number month))
day_of_month (<>.codec n.decimal (<text>.exactly 2 <text>.decimal))
date (<>.lifted (date.date year month day_of_month))]
(in (abstraction date)))))
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