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(.module:
[lux (#- Name)
[abstract
["." monad (#+ do)]]
[control
["." function]
["." try (#+ Try)]
["." exception (#+ exception:)]]
[data
["." text ("#@." order)
["%" format (#+ Format format)]]
[collection
["." list ("#@." functor)]
["." dictionary (#+ Dictionary)]]]]
[/////
["//" phase]
[meta
[archive (#+ Archive)]]])
(type: #export Name Text)
(type: #export (Extension i)
[Name (List i)])
(with-expansions [<Bundle> (as-is (Dictionary Name (Handler s i o)))]
(type: #export (Handler s i o)
(-> Name
(//.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))
(exception: #export (cannot-overwrite {name Name})
(exception.report
["Extension" (%.text name)]))
(exception: #export (incorrect-arity {name Name} {arity Nat} {args Nat})
(exception.report
["Extension" (%.text name)]
["Expected" (%.nat arity)]
["Actual" (%.nat args)]))
(exception: #export [a] (invalid-syntax {name Name} {%format (Format a)} {inputs (List a)})
(exception.report
["Extension" (%.text name)]
["Inputs" (exception.enumerate %format inputs)]))
(exception: #export [s i o] (unknown {name Name} {bundle (Bundle s i o)})
(exception.report
["Extension" (%.text name)]
["Available" (|> bundle
dictionary.keys
(list.sort text@<)
(exception.enumerate %.text))]))
(type: #export (Extender s i o)
(-> Any (Handler s i o)))
(def: #export (install extender name handler)
(All [s i o]
(-> (Extender s i o) Text (Handler s i o) (Operation s i o Any)))
(function (_ [bundle state])
(case (dictionary.get name bundle)
#.None
(#try.Success [[(dictionary.put name (extender handler) bundle) state]
[]])
_
(exception.throw ..cannot-overwrite name))))
(def: #export (with extender extensions)
(All [s i o]
(-> Extender (Dictionary Text (Handler s i o)) (Operation s i o Any)))
(|> extensions
dictionary.entries
(monad.fold //.monad
(function (_ [extension handle] output)
(..install extender extension handle))
[])))
(def: #export (apply archive phase [name parameters])
(All [s i o]
(-> Archive (Phase s i o) (Extension i) (Operation s i o o)))
(function (_ (^@ stateE [bundle state]))
(case (dictionary.get name bundle)
(#.Some handler)
(((handler name phase) archive parameters)
stateE)
#.None
(exception.throw ..unknown [name bundle]))))
(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)])
(#try.Success [[bundle' state'] output])
(#try.Success [[bundle' (set old state')] output])
(#try.Failure error)
(#try.Failure error))))))
(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)])
(#try.Success [[bundle' state'] output])
(#try.Success [[bundle' state] output])
(#try.Failure error)
(#try.Failure error)))))
(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])
(#try.Success [[bundle state] (get state)])))
(def: #export (update transform)
(All [s i o]
(-> (-> s s) (Operation s i o Any)))
(function (_ [bundle state])
(#try.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)
(#try.Success [state' output])
(#try.Success [[bundle state'] output])
(#try.Failure error)
(#try.Failure error))))
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