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... Inspired by;
... "The Different Aspects of Monads and Mixins" by Bruno C. d. S. Oliveira
(.require
[library
[lux (.except)
[abstract
[monoid (.only Monoid)]
[predicate (.only Predicate)]
[monad (.only Monad do)]]]])
(type .public (Mixin i o)
(-> (-> i o) (-> i o) (-> i o)))
(def .public (fixed f)
(All (_ i o) (-> (Mixin i o) (-> i o)))
(function (mix input)
((f mix mix) input)))
(def .public nothing
Mixin
(function (_ delegate recur)
delegate))
(def .public (mixed parent child)
(All (_ i o) (-> (Mixin i o) (Mixin i o) (Mixin i o)))
(function (_ delegate recur)
(parent (child delegate recur) recur)))
(def .public monoid
(All (_ i o) (Monoid (Mixin i o)))
(implementation
(def identity ..nothing)
(def composite ..mixed)))
(def .public (advice when then)
(All (_ i o) (-> (Predicate i) (Mixin i o) (Mixin i o)))
(function (_ delegate recur input)
(if (when input)
((then delegate recur) input)
(delegate input))))
(def .public (before monad action)
(All (_ ! i o) (-> (Monad !) (-> i (! Any)) (Mixin i (! o))))
(function (_ delegate recur input)
(do monad
[_ (action input)]
(delegate input))))
(def .public (after monad action)
(All (_ ! i o) (-> (Monad !) (-> i o (! Any)) (Mixin i (! o))))
(function (_ delegate recur input)
(do monad
[output (delegate input)
_ (action input output)]
(in output))))
(type .public (Recursive i o)
(-> (-> i o) (-> i o)))
(def .public (of_recursive recursive)
(All (_ i o) (-> (Recursive i o) (Mixin i o)))
(function (_ delegate recur)
(recursive recur)))
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