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(.module:
[lux #*
[control
[monad (#+ do)]
["ex" exception (#+ exception:)]]
[data
["." error (#+ Error)]
["." text ("text/." Order<Text>)
format]
[collection
["." list ("list/." Functor<List>)]
["." dictionary (#+ Dictionary)]]]
["." function]]
["." //])
(type: #export (Extension i)
[Text (List i)])
(with-expansions [<Bundle> (as-is (Dictionary Text (Handler s i o)))]
(type: #export (Handler s i o)
(-> Text
(//.Phase [<Bundle> s] i o)
(//.Phase [<Bundle> s] (List i) o)))
(type: #export (Bundle s i o)
<Bundle>))
(type: #export (State s i o)
{#bundle (Bundle s i o)
#state s})
(type: #export (Operation s i o v)
(//.Operation (State s i o) v))
(type: #export (Phase s i o)
(//.Phase (State s i o) i o))
(do-template [<name>]
[(exception: #export (<name> {name Text})
(ex.report ["Extension" (%t name)]))]
[cannot-overwrite]
[invalid-syntax]
)
(exception: #export [s i o] (unknown {where Text} {name Text} {bundle (Bundle s i o)})
(ex.report ["Where" (%t where)]
["Extension" (%t name)]
["Available" (|> bundle
dictionary.keys
(list.sort text/<)
(list/map (|>> %t (format "\n\t")))
(text.join-with ""))]))
(exception: #export (incorrect-arity {name Text} {arity Nat} {args Nat})
(ex.report ["Extension" (%t name)]
["Expected" (%n arity)]
["Actual" (%n args)]))
(def: #export (install name handler)
(All [s i o]
(-> Text (Handler s i o) (Operation s i o Any)))
(function (_ [bundle state])
(if (dictionary.contains? name bundle)
(ex.throw cannot-overwrite name)
(#error.Success [[(dictionary.put name handler bundle) state]
[]]))))
(def: #export (apply where phase [name parameters])
(All [s i o]
(-> Text (Phase s i o) (Extension i) (Operation s i o o)))
(function (_ (^@ stateE [bundle state]))
(case (dictionary.get name bundle)
#.None
(ex.throw unknown [where name bundle])
(#.Some handler)
((handler name phase) parameters stateE))))
(def: #export (localized get set transform)
(All [s s' i o v]
(-> (-> s s') (-> s' s s) (-> s' s')
(-> (Operation s i o v) (Operation s i o v))))
(function (_ operation)
(function (_ [bundle state])
(let [old (get state)]
(case (operation [bundle (set (transform old) state)])
(#error.Error error)
(#error.Error error)
(#error.Success [[bundle' state'] output])
(#error.Success [[bundle' (set old state')] output]))))))
(def: #export (temporary transform)
(All [s i o v]
(-> (-> s s)
(-> (Operation s i o v) (Operation s i o v))))
(function (_ operation)
(function (_ [bundle state])
(case (operation [bundle (transform state)])
(#error.Error error)
(#error.Error error)
(#error.Success [[bundle' state'] output])
(#error.Success [[bundle' state] output])))))
(def: #export (with-state state)
(All [s i o v]
(-> s (-> (Operation s i o v) (Operation s i o v))))
(..temporary (function.constant state)))
(def: #export (read get)
(All [s i o v]
(-> (-> s v) (Operation s i o v)))
(function (_ [bundle state])
(#error.Success [[bundle state] (get state)])))
(def: #export (update transform)
(All [s i o]
(-> (-> s s) (Operation s i o Any)))
(function (_ [bundle state])
(#error.Success [[bundle (transform state)] []])))
(def: #export (lift action)
(All [s i o v]
(-> (//.Operation s v)
(//.Operation [(Bundle s i o) s] v)))
(function (_ [bundle state])
(case (action state)
(#error.Error error)
(#error.Error error)
(#error.Success [state' output])
(#error.Success [[bundle state'] output]))))
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