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(.module:
{#.doc "Functionality for working with variants (particularly 2-variants)."}
[lux #*
[abstract
[equivalence (#+ Equivalence)]
[hash (#+ Hash)]]])
(template [<name> <type> <right?>]
[(def: #export (<name> value)
(All [a b] (-> <type> (| a b)))
(0 <right?> value))]
[left a #0]
[right b #1])
(def: #export (either fl fr)
(All [a b c]
(-> (-> a c) (-> b c)
(-> (| a b) c)))
(function (_ input)
(case input
(0 #0 l) (fl l)
(0 #1 r) (fr r))))
(def: #export (each fl fr)
(All [l l' r r']
(-> (-> l l') (-> r r')
(-> (| l r) (| l' r'))))
(function (_ input)
(case input
(0 #0 l) (0 #0 (fl l))
(0 #1 r) (0 #1 (fr r)))))
(template [<name> <side> <right?>]
[(def: #export (<name> es)
(All [a b] (-> (List (| a b)) (List <side>)))
(case es
#.Nil
#.Nil
(#.Cons (0 <right?> x) es')
(#.Cons [x (<name> es')])
(#.Cons _ es')
(<name> es')))]
[lefts a #0]
[rights b #1]
)
(def: #export (partition xs)
(All [a b] (-> (List (| a b)) [(List a) (List b)]))
(case xs
#.Nil
[#.Nil #.Nil]
(#.Cons x xs')
(let [[lefts rights] (partition xs')]
(case x
(0 #0 x') [(#.Cons x' lefts) rights]
(0 #1 x') [lefts (#.Cons x' rights)]))))
(structure: #export (equivalence l@= r@=)
(All [l r]
(-> (Equivalence l) (Equivalence r)
(Equivalence (| l r))))
(def: (= reference sample)
(case [reference sample]
[(#.Left reference) (#.Left sample)]
(l@= reference sample)
[(#.Right reference) (#.Right sample)]
(r@= reference sample)
_
false)))
(structure: #export (hash (^open "l@.") (^open "r@."))
(All [l r]
(-> (Hash l) (Hash r)
(Hash (| l r))))
(def: &equivalence (..equivalence l@= r@=))
(def: (hash value)
(case value
(#.Left value)
(l@hash value)
(#.Right value)
(.nat ("lux i64 *"
(.int 2)
(.int (r@hash value)))))))
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