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(.module:
[library
[lux #*
[abstract
[equivalence (#+ Equivalence)]
[functor (#+ Functor)]]
[data
[collection
["//" list]]]
[type
abstract]]])
(abstract: .public (Stack a)
{}
(List a)
(def: .public empty
Stack
(:abstraction (list)))
(def: .public size
(All [a] (-> (Stack a) Nat))
(|>> :representation //.size))
(def: .public empty?
(All [a] (-> (Stack a) Bit))
(|>> :representation //.empty?))
(def: .public (value stack)
(All [a] (-> (Stack a) (Maybe a)))
(case (:representation stack)
#.End
#.None
(#.Item value _)
(#.Some value)))
(def: .public (next stack)
(All [a] (-> (Stack a) (Maybe [a (Stack a)])))
(case (:representation stack)
#.End
#.None
(#.Item top stack')
(#.Some [top (:abstraction stack')])))
(def: .public (top value stack)
(All [a] (-> a (Stack a) (Stack a)))
(:abstraction (#.Item value (:representation stack))))
(implementation: .public (equivalence super)
(All [a]
(-> (Equivalence a)
(Equivalence (Stack a))))
(def: (= reference subject)
(\ (//.equivalence super) = (:representation reference) (:representation subject))))
(implementation: .public functor
(Functor Stack)
(def: (each f value)
(|> value
:representation
(\ //.functor each f)
:abstraction)))
)
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