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|
(.using
[library
[lux {"-" list}
[abstract
[monoid {"+" Monoid}]
[equivalence {"+" Equivalence}]
[hash {"+" Hash}]
[apply {"+" Apply}]
["[0]" functor {"+" Functor}]
["[0]" monad {"+" Monad do}]]
[meta
["[0]" location]]]])
... (type: (Maybe a)
... {.#None}
... {.#Some a})
(implementation: .public monoid
(All (_ a) (Monoid (Maybe a)))
(def: identity
{.#None})
(def: (composite mx my)
(case mx
{.#None}
my
_
mx)))
(implementation: .public functor
(Functor Maybe)
(def: (each f ma)
(case ma
{.#Some a}
{.#Some (f a)}
... {.#None}
it
(:expected it))))
(implementation: .public apply
(Apply Maybe)
(def: &functor ..functor)
(def: (on fa ff)
(case [ff fa]
[{.#Some f} {.#Some a}]
{.#Some (f a)}
_
{.#None})))
(implementation: .public monad
(Monad Maybe)
(def: &functor ..functor)
(def: (in x)
{.#Some x})
(def: (conjoint mma)
(case mma
{.#Some mx}
mx
... {.#None}
it
(:expected it))))
(implementation: .public (equivalence super)
(All (_ a) (-> (Equivalence a) (Equivalence (Maybe a))))
(def: (= mx my)
(case [mx my]
[{.#None} {.#None}]
#1
[{.#Some x} {.#Some y}]
(# super = x y)
_
#0)))
(implementation: .public (hash super)
(All (_ a) (-> (Hash a) (Hash (Maybe a))))
(def: &equivalence
(..equivalence (# super &equivalence)))
(def: (hash value)
(case value
{.#None}
1
{.#Some value}
(# super hash value))))
(implementation: .public (with monad)
(All (_ M) (-> (Monad M) (Monad (All (_ a) (M (Maybe a))))))
(def: &functor
(functor.composite (the monad.&functor monad)
..functor))
(def: in
(|>> (# ..monad in)
(# monad in)))
(def: (conjoint MmMma)
(do monad
[mMma MmMma]
(case mMma
{.#Some Mma}
Mma
... {.#None}
it
(in (:expected it))))))
(def: .public (lifted monad)
(All (_ M a) (-> (Monad M) (-> (M a) (M (Maybe a)))))
(# monad each (# ..monad in)))
(macro: .public (else tokens state)
(case tokens
(^ (.list else maybe))
(let [g!temp (: Code [location.dummy {.#Symbol ["" ""]}])]
{.#Right [state (.list (` (.case (~ maybe)
{.#Some (~ g!temp)}
(~ g!temp)
... {.#None}
(~ g!temp)
(~ else))))]})
_
{.#Left "Wrong syntax for else"}))
(def: .public trusted
(All (_ a) (-> (Maybe a) a))
(|>> (..else (undefined))))
(def: .public (list value)
(All (_ a) (-> (Maybe a) (List a)))
(case value
{.#Some value}
{.#Item value {.#End}}
... {.#None}
_
{.#End}))
(macro: .public (when tokens state)
(case tokens
(^ (.list test then))
{.#Right [state (.list (` (.if (~ test)
(~ then)
{.#None})))]}
_
{.#Left "Wrong syntax for when"}))
|
