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(.using
[library
[lux (.except local with)
["@" target]
[abstract
[apply (.only Apply)]
["[0]" functor (.only Functor)]
["[0]" monad (.only Monad do)]]]])
(type: .public (Reader r a)
(-> r a))
(def .public read
(All (_ r) (Reader r r))
(function (_ env) env))
(def .public (local change proc)
(All (_ r a) (-> (-> r r) (Reader r a) (Reader r a)))
(|>> change proc))
(def .public (result env proc)
(All (_ r a) (-> r (Reader r a) a))
(proc env))
(def .public functor
(All (_ r) (Functor (Reader r)))
(implementation
(def (each f fa)
(function (_ env)
(f (fa env))))))
(def .public apply
(All (_ r) (Apply (Reader r)))
(implementation
(def functor ..functor)
(def (on fa ff)
(function (_ env)
((ff env) (fa env))))))
(def .public monad
(All (_ r) (Monad (Reader r)))
(implementation
(def functor ..functor)
(def (in x)
(function (_ env) x))
(def (conjoint mma)
(function (_ env)
(mma env env)))))
(def .public (with monad)
(All (_ !) (-> (Monad !) (All (_ e) (Monad (All (_ a) (Reader e (! a)))))))
(implementation
(def functor
(functor.composite ..functor (the monad.functor monad)))
(def in
(|>> (at monad in)
(at ..monad in)))
(def (conjoint eMeMa)
(function (_ env)
(do monad
[eMa (result env eMeMa)]
(result env eMa))))))
(def .public lifted
(All (_ ! e a) (-> (! a) (Reader e (! a))))
(at ..monad in))
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