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|
(.require
[library
[lux (.except nat)
[abstract
[equivalence (.only Equivalence)]
[hash (.only Hash)]
[order (.only Order)]
[enum (.only Enum)]
[codec (.only Codec)]]
[control
["[0]" try (.only Try)]
["[0]" exception (.only Exception)]]
[data
["[0]" text (.use "[1]#[0]" monoid)]]
[math
[number
["n" nat]]]
[meta
[macro
["^" pattern]
["[0]" template]]]]])
(type .public Day
(Variant
{#Sunday}
{#Monday}
{#Tuesday}
{#Wednesday}
{#Thursday}
{#Friday}
{#Saturday}))
(def .public equivalence
(Equivalence Day)
(implementation
(def (= reference sample)
(when [reference sample]
(^.with_template [<tag>]
[[{<tag>} {<tag>}]
true])
([#Sunday]
[#Monday]
[#Tuesday]
[#Wednesday]
[#Thursday]
[#Friday]
[#Saturday])
_
false))))
(def (nat day)
(-> Day Nat)
(when day
(^.with_template [<nat> <day>]
[{<day>} <nat>])
([0 #Sunday]
[1 #Monday]
[2 #Tuesday]
[3 #Wednesday]
[4 #Thursday]
[5 #Friday]
[6 #Saturday])))
(def .public order
(Order Day)
(implementation
(def equivalence ..equivalence)
(def (< reference sample)
(n.< (..nat reference) (..nat sample)))))
(def .public enum
(Enum Day)
(implementation
(def order ..order)
(def (succ day)
(when day
{#Sunday} {#Monday}
{#Monday} {#Tuesday}
{#Tuesday} {#Wednesday}
{#Wednesday} {#Thursday}
{#Thursday} {#Friday}
{#Friday} {#Saturday}
{#Saturday} {#Sunday}))
(def (pred day)
(when day
{#Monday} {#Sunday}
{#Tuesday} {#Monday}
{#Wednesday} {#Tuesday}
{#Thursday} {#Wednesday}
{#Friday} {#Thursday}
{#Saturday} {#Friday}
{#Sunday} {#Saturday}))))
(exception.def .public (not_a_day_of_the_week value)
(Exception Text)
(exception.report
(list ["Value" (text.format value)])))
(def .public codec
(Codec Text Day)
(implementation
(def (encoded value)
(when value
(^.with_template [<tag>]
[{<tag>}
(text.replaced "#" "" (template.text [<tag>]))])
([..#Monday]
[..#Tuesday]
[..#Wednesday]
[..#Thursday]
[..#Friday]
[..#Saturday]
[..#Sunday])))
(def (decoded value)
(when (text#composite "#" value)
(^.with_template [<tag>]
[(template.text [<tag>])
{try.#Success {<tag>}}])
([..#Monday]
[..#Tuesday]
[..#Wednesday]
[..#Thursday]
[..#Friday]
[..#Saturday]
[..#Sunday])
_ (exception.except ..not_a_day_of_the_week [value])))))
(def .public week
(List Day)
(list {#Sunday}
{#Monday}
{#Tuesday}
{#Wednesday}
{#Thursday}
{#Friday}
{#Saturday}))
(with_expansions [<pairs> (these [01 #Sunday]
[02 #Monday]
[03 #Tuesday]
[04 #Wednesday]
[05 #Thursday]
[06 #Friday]
[07 #Saturday])]
(def .public (number day)
(-> Day Nat)
(when day
(^.with_template [<number> <day>]
[{<day>}
<number>])
(<pairs>)))
(exception.def .public (invalid_day number)
(Exception Nat)
(exception.report
(list ["Number" (of n.decimal encoded number)]
["Valid range" (.text_composite# (of n.decimal encoded (..number {#Sunday}))
" ~ "
(of n.decimal encoded (..number {#Saturday})))])))
(def .public (by_number number)
(-> Nat (Try Day))
(when number
(^.with_template [<number> <day>]
[<number>
{try.#Success {<day>}}])
(<pairs>)
_
(exception.except ..invalid_day [number])))
)
(def .public hash
(Hash Day)
(implementation
(def equivalence ..equivalence)
(def (hash day)
(when day
(^.with_template [<prime> <day>]
[{<day>}
<prime>])
([02 #Sunday]
[03 #Monday]
[05 #Tuesday]
[07 #Wednesday]
[11 #Thursday]
[13 #Friday]
[17 #Saturday])))))
|
