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(.module:
[library
[lux {"-" Name}
[abstract
[equivalence {"+" Equivalence}]
[hash {"+" Hash}]
["[0]" monad {"+" do}]]
[control
["[0]" function]
["[0]" try {"+" Try}]
["[0]" exception {"+" exception:}]]
[data
["[0]" product]
["[0]" text ("[1]#[0]" order)
["%" format {"+" Format format}]]
[collection
["[0]" list]
["[0]" dictionary {"+" Dictionary}]]]]]
[/////
["//" phase]
[meta
[archive {"+" Archive}]]])
(type: .public Name
Text)
(type: .public (Extension a)
[Name (List a)])
(def: .public equivalence
(All (_ a) (-> (Equivalence a) (Equivalence (Extension a))))
(|>> list.equivalence
(product.equivalence text.equivalence)))
(def: .public hash
(All (_ a) (-> (Hash a) (Hash (Extension a))))
(|>> list.hash
(product.hash text.hash)))
(with_expansions [<Bundle> (as_is (Dictionary Name (Handler s i o)))]
(type: .public (Handler s i o)
(-> Name
(//.Phase [<Bundle> s] i o)
(//.Phase [<Bundle> s] (List i) o)))
(type: .public (Bundle s i o)
<Bundle>))
(def: .public empty
Bundle
(dictionary.empty text.hash))
(type: .public (State s i o)
(Record
[#bundle (Bundle s i o)
#state s]))
(type: .public (Operation s i o v)
(//.Operation (State s i o) v))
(type: .public (Phase s i o)
(//.Phase (State s i o) i o))
(exception: .public (cannot_overwrite [name Name])
(exception.report
["Extension" (%.text name)]))
(exception: .public (incorrect_arity [name Name
arity Nat
args Nat])
(exception.report
["Extension" (%.text name)]
["Expected" (%.nat arity)]
["Actual" (%.nat args)]))
(exception: .public [a] (invalid_syntax [name Name
%format (Format a)
inputs (List a)])
(exception.report
["Extension" (%.text name)]
["Inputs" (exception.listing %format inputs)]))
(exception: .public [s i o] (unknown [name Name
bundle (Bundle s i o)])
(exception.report
["Extension" (%.text name)]
["Available" (|> bundle
dictionary.keys
(list.sorted text#<)
(exception.listing %.text))]))
(type: .public (Extender s i o)
(-> Any (Handler s i o)))
(def: .public (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.value name bundle)
{.#None}
{try.#Success [[(dictionary.has name (extender handler) bundle) state]
[]]}
_
(exception.except ..cannot_overwrite name))))
(def: .public (with extender extensions)
(All (_ s i o)
(-> Extender (Bundle s i o) (Operation s i o Any)))
(|> extensions
dictionary.entries
(monad.mix //.monad
(function (_ [extension handle] output)
(..install extender extension handle))
[])))
(def: .public (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.value name bundle)
{.#Some handler}
(((handler name phase) archive parameters)
stateE)
{.#None}
(exception.except ..unknown [name bundle]))))
(def: .public (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: .public (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: .public (with_state state)
(All (_ s i o v)
(-> s (-> (Operation s i o v) (Operation s i o v))))
(..temporary (function.constant state)))
(def: .public (read get)
(All (_ s i o v)
(-> (-> s v) (Operation s i o v)))
(function (_ [bundle state])
{try.#Success [[bundle state] (get state)]}))
(def: .public (update transform)
(All (_ s i o)
(-> (-> s s) (Operation s i o Any)))
(function (_ [bundle state])
{try.#Success [[bundle (transform state)] []]}))
(def: .public (lifted 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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