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(.module:
[lux #*
[abstract
[equivalence (#+ Equivalence)]
[hash (#+ Hash)]
[order (#+ Order)]
[enum (#+ Enum)]
[codec (#+ Codec)]]
[control
["." try (#+ Try)]
["." exception (#+ exception:)]]
[data
["." text]]
[math
[number
["n" nat]]]])
(type: #export Month
#January
#February
#March
#April
#May
#June
#July
#August
#September
#October
#November
#December)
(structure: #export equivalence
(Equivalence 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)))
(with_expansions [<pairs> (as_is [01 #January]
[02 #February]
[03 #March]
[04 #April]
[05 #May]
[06 #June]
[07 #July]
[08 #August]
[09 #September]
[10 #October]
[11 #November]
[12 #December])]
(def: #export (number month)
(-> Month Nat)
(case month
(^template [<number> <month>]
[<month> <number>])
(<pairs>)))
(exception: #export (invalid_month {number Nat})
(exception.report
["Number" (\ n.decimal encode number)]
["Valid range" ($_ "lux text concat"
(\ n.decimal encode (..number #January))
" ~ "
(\ n.decimal encode (..number #December)))]))
(def: #export (by_number number)
(-> Nat (Try Month))
(case number
(^template [<number> <month>]
[<number> (#try.Success <month>)])
(<pairs>)
_ (exception.throw ..invalid_month [number])))
)
(structure: #export hash
(Hash Month)
(def: &equivalence ..equivalence)
(def: hash ..number))
(structure: #export order
(Order Month)
(def: &equivalence ..equivalence)
(def: (< reference sample)
(n.< (..number reference) (..number sample))))
(structure: #export enum
(Enum Month)
(def: &order ..order)
(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)))
(def: #export (days month)
(-> Month Nat)
(case month
(^template [<days> <month>]
[<month> <days>])
([31 #January]
[28 #February]
[31 #March]
[30 #April]
[31 #May]
[30 #June]
[31 #July]
[31 #August]
[30 #September]
[31 #October]
[30 #November]
[31 #December])))
(def: #export (leap_year_days month)
(-> Month Nat)
(case month
#February (inc (..days month))
_ (..days month)))
(def: #export year
(List Month)
(list #January
#February
#March
#April
#May
#June
#July
#August
#September
#October
#November
#December))
(exception: #export (not_a_month_of_the_year {value Text})
(exception.report
["Value" (text.format value)]))
(structure: #export codec
(Codec Text Month)
(def: (encode value)
(case value
#January "January"
#February "February"
#March "March"
#April "April"
#May "May"
#June "June"
#July "July"
#August "August"
#September "September"
#October "October"
#November "November"
#December "December"))
(def: (decode value)
(case value
"January" (#try.Success #January)
"February" (#try.Success #February)
"March" (#try.Success #March)
"April" (#try.Success #April)
"May" (#try.Success #May)
"June" (#try.Success #June)
"July" (#try.Success #July)
"August" (#try.Success #August)
"September" (#try.Success #September)
"October" (#try.Success #October)
"November" (#try.Success #November)
"December" (#try.Success #December)
_ (exception.throw ..not_a_month_of_the_year [value]))))
|
