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(.using
[library
[lux (.except except)
[abstract
[functor (.only Functor)]
[apply (.only Apply)]
["[0]" monad (.only Monad do)]]
[control
["[0]" try (.only Try)]]
[data
["[0]" text (.only)
["%" format (.only format)]]
[collection
["[0]" list (.open: "[1]#[0]" mix)]]]]]
[//
["[0]" exception (.only Exception exception:)]])
(type: (Cleaner r !)
(-> r (! (Try Any))))
(type: .public (Region r ! a)
(-> [r (List (Cleaner r !))]
(! [(List (Cleaner r !))
(Try a)])))
(def: separator
Text
(format text.new_line
"-----------------------------------------" text.new_line
"-----------------------------------------" text.new_line
"-----------------------------------------" text.new_line
text.new_line))
(exception: .public [a] (clean_up_error [error Text
output (Try a)])
(format error
(case output
{try.#Success _}
""
{try.#Failure error|output}
(format separator
error|output))))
(def: (clean clean_up output)
(All (_ a) (-> (Try Any) (Try a) (Try a)))
(case clean_up
{try.#Success _}
output
{try.#Failure error}
(exception.except ..clean_up_error [error output])))
(def: .public (run! monad computation)
(All (_ ! a)
(-> (Monad !) (All (_ r) (Region r ! a))
(! (Try a))))
(do [! monad]
[[cleaners output] (computation [[] (list)])]
(|> cleaners
(monad.each ! (function (_ cleaner) (cleaner [])))
(at ! each (list#mix clean output)))))
(def: .public (acquire! monad cleaner value)
(All (_ ! a) (-> (Monad !) (-> a (! (Try Any))) a
(All (_ r) (Region r ! a))))
(function (_ [region cleaners])
(at monad in [{.#Item (function (_ region) (cleaner value))
cleaners}
{try.#Success value}])))
(implementation: .public (functor super)
(All (_ !)
(-> (Functor !)
(All (_ r) (Functor (Region r !)))))
(def: (each f)
(function (_ fa)
(function (_ region+cleaners)
(at super each
(function (_ [cleaners' temp])
[cleaners' (case temp
{try.#Success value}
{try.#Success (f value)}
{try.#Failure error}
{try.#Failure error})])
(fa region+cleaners))))))
(implementation: .public (apply super)
(All (_ !)
(-> (Monad !)
(All (_ r) (Apply (Region r !)))))
(def: functor
(..functor (the monad.functor super)))
(def: (on fa ff)
(function (_ [region cleaners])
(do super
[[cleaners ef] (ff [region cleaners])
[cleaners ea] (fa [region cleaners])]
(case ef
{try.#Success f}
(case ea
{try.#Success a}
(in [cleaners {try.#Success (f a)}])
{try.#Failure error}
(in [cleaners {try.#Failure error}]))
{try.#Failure error}
(in [cleaners {try.#Failure error}]))))))
(implementation: .public (monad super)
(All (_ !)
(-> (Monad !)
(All (_ r) (Monad (Region r !)))))
(def: functor
(..functor (the monad.functor super)))
(def: (in value)
(function (_ [region cleaners])
(at super in [cleaners {try.#Success value}])))
(def: (conjoint ffa)
(function (_ [region cleaners])
(do super
[[cleaners efa] (ffa [region cleaners])]
(case efa
{try.#Success fa}
(fa [region cleaners])
{try.#Failure error}
(in [cleaners {try.#Failure error}]))))))
(def: .public (failure monad error)
(All (_ ! a)
(-> (Monad !) Text
(All (_ r) (Region r ! a))))
(function (_ [region cleaners])
(at monad in [cleaners {try.#Failure error}])))
(def: .public (except monad exception message)
(All (_ ! e a)
(-> (Monad !) (Exception e) e
(All (_ r) (Region r ! a))))
(failure monad (exception.error exception message)))
(def: .public (lifted monad operation)
(All (_ ! a)
(-> (Monad !) (! a)
(All (_ r) (Region r ! a))))
(function (_ [region cleaners])
(at monad each
(|>> {try.#Success} [cleaners])
operation)))
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