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(.module:
{#.doc "Functionality for working with variants (particularly 2-variants)."}
[library
[lux #*
[abstract
[equivalence (#+ Equivalence)]
[hash (#+ Hash)]]]])
(template [<right?> <name> <doc>]
[(def: #export (<name> value)
{#.doc (doc <doc>)}
(All [left right]
(-> <name> (Or left right)))
(0 <right?> value))]
[#0 left
"Lifts value to the left side of a 2-variant."]
[#1 right
"Lifts value to the right side of a 2-variant."])
(def: #export (either fl fr)
{#.doc (doc "Applies a function to either side of a 2-variant.")}
(All [a b c]
(-> (-> a c) (-> b c)
(-> (Or a b) c)))
(function (_ input)
(case input
(0 #0 l) (fl l)
(0 #1 r) (fr r))))
(def: #export (apply fl fr)
{#.doc (doc "Applies functions to both sides of a 2-variant.")}
(All [l l' r r']
(-> (-> l l') (-> r r')
(-> (Or l r) (Or 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 (Or a b)) (List <side>)))
(case es
#.End
#.End
(#.Item (0 <right?> x) es')
(#.Item [x (<name> es')])
(#.Item _ es')
(<name> es')))]
[lefts a #0]
[rights b #1]
)
(def: #export (partition xs)
(All [a b] (-> (List (Or a b)) [(List a) (List b)]))
(case xs
#.End
[#.End #.End]
(#.Item x xs')
(let [[lefts rights] (partition xs')]
(case x
(0 #0 x') [(#.Item x' lefts) rights]
(0 #1 x') [lefts (#.Item x' rights)]))))
(def: #export (equivalence left right)
(All [l r] (-> (Equivalence l) (Equivalence r) (Equivalence (Or l r))))
(implementation
(def: (= reference sample)
(case [reference sample]
[(#.Left reference) (#.Left sample)]
(\ left = reference sample)
[(#.Right reference) (#.Right sample)]
(\ right = reference sample)
_
false))))
(def: #export (hash left right)
(All [l r] (-> (Hash l) (Hash r) (Hash (Or l r))))
(implementation
(def: &equivalence
(..equivalence (\ left &equivalence)
(\ right &equivalence)))
(def: (hash value)
(case value
(#.Left value)
(\ left hash value)
(#.Right value)
(\ right hash value)))))
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