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... This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
... If a copy of the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
... Inspired by;
... "The Different Aspects of Monads and Mixins" by Bruno C. d. S. Oliveira
(.require
[library
[lux (.except)
[abstract
[monoid (.only Monoid)]
[monad (.only Monad do)]]
[control
[function
[predicate (.only Predicate)]]]]])
(type .public (Mixin input output)
(-> (-> input output) (-> input output)
(-> input output)))
(def .public (fixed f)
(All (_ input output)
(-> (Mixin input output)
(-> input output)))
(function (mix input)
((f mix mix) input)))
(def .public nothing
Mixin
(function (_ next again)
next))
(def .public (mixed parent child)
(All (_ input output)
(-> (Mixin input output) (Mixin input output)
(Mixin input output)))
(function (_ next again)
(parent (child next again) again)))
(def .public monoid
(All (_ input output)
(Monoid (Mixin input output)))
(implementation
(def identity ..nothing)
(def composite ..mixed)))
(def .public (advice when then)
(All (_ input output)
(-> (Predicate input) (Mixin input output)
(Mixin input output)))
(function (_ next again input)
(if (when input)
((then next again) input)
(next input))))
(def .public (before ! action)
(All (_ ! input output)
(-> (Monad !) (-> input (! Any))
(Mixin input (! output))))
(function (_ next again input)
(do !
[_ (action input)]
(next input))))
(def .public (after ! action)
(All (_ ! input output)
(-> (Monad !) (-> input output (! Any))
(Mixin input (! output))))
(function (_ next again input)
(do !
[output (next input)
_ (action input output)]
(in output))))
(type .public (Recursive input output)
(-> (-> input output)
(-> input output)))
(def .public (of_recursive recursive)
(All (_ input output)
(-> (Recursive input output)
(Mixin input output)))
(function (_ next again)
(recursive again)))
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