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(.module:
[lux #*
[abstract
[functor (#+ Functor)]
[apply (#+ Apply)]
["." monad (#+ Monad do)]]
[data
["." error (#+ Error)]
["." text
format]
[collection
["." list ("#;." fold)]]]]
[//
["ex" exception (#+ Exception exception:)]])
(type: (Cleaner r m)
(-> r (m (Error Any))))
(type: #export (Region r m a)
(-> [r (List (Cleaner r m))]
(m [(List (Cleaner r m))
(Error a)])))
(def: separator
Text
(format text.new-line
"-----------------------------------------" text.new-line
"-----------------------------------------" text.new-line
"-----------------------------------------" text.new-line
text.new-line))
(exception: #export [a] (clean-up-error {error Text}
{output (Error a)})
(format error
(case output
(#error.Success _)
""
(#error.Failure error|output)
(format separator
error|output))))
(def: (combine-outcomes clean-up output)
(All [a] (-> (Error Any) (Error a) (Error a)))
(case clean-up
(#error.Success _)
output
(#error.Failure error|clean-up)
(ex.throw clean-up-error [error|clean-up output])))
(def: #export (run Monad<m> computation)
(All [m a]
(-> (Monad m) (All [r] (Region r m a))
(m (Error a))))
(do Monad<m>
[[cleaners output] (computation [[] (list)])
results (monad.map @ (function (_ cleaner) (cleaner []))
cleaners)]
(wrap (list;fold combine-outcomes output results))))
(def: #export (acquire Monad<m> cleaner value)
(All [m a] (-> (Monad m) (-> a (m (Error Any))) a
(All [r] (Region r m a))))
(function (_ [region cleaners])
(:: Monad<m> wrap [(#.Cons (function (_ region) (cleaner value))
cleaners)
(#error.Success value)])))
(structure: #export (functor Functor<m>)
(All [m]
(-> (Functor m)
(All [r] (Functor (Region r m)))))
(def: (map f)
(function (_ fa)
(function (_ region+cleaners)
(:: Functor<m> map
(function (_ [cleaners' temp])
[cleaners' (case temp
(#error.Success value)
(#error.Success (f value))
(#error.Failure error)
(#error.Failure error))])
(fa region+cleaners))))))
(structure: #export (apply Monad<m>)
(All [m]
(-> (Monad m)
(All [r] (Apply (Region r m)))))
(def: &functor
(..functor (get@ #monad.&functor Monad<m>)))
(def: (apply ff fa)
(function (_ [region cleaners])
(do Monad<m>
[[cleaners ef] (ff [region cleaners])
[cleaners ea] (fa [region cleaners])]
(case [ef ea]
[(#error.Success f) (#error.Success a)]
(wrap [cleaners (#error.Success (f a))])
(^or [(#error.Failure error) _]
[_ (#error.Failure error)])
(wrap [cleaners (#error.Failure error)]))))))
(structure: #export (monad Monad<m>)
(All [m]
(-> (Monad m)
(All [r] (Monad (Region r m)))))
(def: &functor
(..functor (get@ #monad.&functor Monad<m>)))
(def: (wrap value)
(function (_ [region cleaners])
(:: Monad<m> wrap [cleaners (#error.Success value)])))
(def: (join ffa)
(function (_ [region cleaners])
(do Monad<m>
[[cleaners efa] (ffa [region cleaners])]
(case efa
(#error.Success fa)
(fa [region cleaners])
(#error.Failure error)
(wrap [cleaners (#error.Failure error)]))))))
(def: #export (fail Monad<m> error)
(All [m a]
(-> (Monad m) Text
(All [r] (Region r m a))))
(function (_ [region cleaners])
(:: Monad<m> wrap [cleaners (#error.Failure error)])))
(def: #export (throw Monad<m> exception message)
(All [m e a]
(-> (Monad m) (Exception e) e
(All [r] (Region r m a))))
(function (_ [region cleaners])
(:: Monad<m> wrap [cleaners (ex.throw exception message)])))
(def: #export (lift Monad<m> operation)
(All [m a]
(-> (Monad m) (m a)
(All [r] (Region r m a))))
(function (_ [region cleaners])
(do Monad<m>
[output operation]
(wrap [cleaners (#error.Success output)]))))
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