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## Inspired by;
## "The Different Aspects of Monads and Mixins" by Bruno C. d. S. Oliveira
(.module:
[library
[lux #*
[abstract
[monoid (#+ Monoid)]
[predicate (#+ Predicate)]
[monad (#+ Monad do)]]]])
(type: #export (Mixin i o)
(-> (-> i o) (-> i o) (-> i o)))
(def: #export (mixin f)
(All [i o] (-> (Mixin i o) (-> i o)))
(function (mix input)
((f mix mix) input)))
(def: #export nothing
Mixin
(function (_ delegate recur)
delegate))
(def: #export (inherit parent child)
(All [i o] (-> (Mixin i o) (Mixin i o) (Mixin i o)))
(function (_ delegate recur)
(parent (child delegate recur) recur)))
(implementation: #export monoid
(All [i o] (Monoid (Mixin i o)))
(def: identity ..nothing)
(def: compose ..inherit))
(def: #export (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: #export (before monad action)
(All [! i o] (-> (Monad !) (-> i (! Any)) (Mixin i (! o))))
(function (_ delegate recur input)
(do monad
[_ (action input)]
(delegate input))))
(def: #export (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)]
(wrap output))))
(type: #export (Recursive i o)
(-> (-> i o) (-> i o)))
(def: #export (from-recursive recursive)
(All [i o] (-> (Recursive i o) (Mixin i o)))
(function (_ delegate recur)
(recursive recur)))
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