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(.module:
[library
[lux "*"
[abstract
[functor {"+" Functor}]
[apply {"+" Apply}]
[monad {"+" Monad do}]]
[control
["[0]" function]
[parser
["<[0]>" code]]]
[macro {"+" with_identifiers}
[syntax {"+" syntax:}]
["[0]" code]]]])
(type: .public (Cont i o)
(-> (-> i o) o))
(def: .public (continued next cont)
(All (_ i o) (-> (-> i o) (Cont i o) o))
(cont next))
(def: .public result
(All (_ a) (-> (Cont a a) a))
(..continued function.identity))
(def: .public (with_current f)
(All (_ a b z)
(-> (-> (-> a (Cont b z))
(Cont a z))
(Cont a z)))
(function (_ k)
(f (function (_ a) (function (_ _) (k a)))
k)))
(syntax: .public (pending [expr <code>.any])
(with_identifiers [g!_ g!k]
(in (list (` (.function ((~ g!_) (~ g!k)) ((~ g!k) (~ expr))))))))
(def: .public (reset scope)
(All (_ i o) (-> (Cont i i) (Cont i o)))
(function (_ k)
(k (result scope))))
(def: .public (shift f)
(All (_ a)
(-> (-> (-> a (Cont a a))
(Cont a a))
(Cont a a)))
(function (_ oc)
(f (function (_ a) (function (_ ic) (ic (oc a))))
function.identity)))
(implementation: .public functor
(All (_ o) (Functor (All (_ i) (Cont i o))))
(def: (each f fv)
(function (_ k)
(fv (function.composite k f)))))
(implementation: .public apply
(All (_ o) (Apply (All (_ i) (Cont i o))))
(def: &functor ..functor)
(def: (on fv ff)
(function (_ k)
(|> (k (f v))
(function (_ v)) fv
(function (_ f)) ff))))
(implementation: .public monad
(All (_ o) (Monad (All (_ i) (Cont i o))))
(def: &functor ..functor)
(def: (in value)
(function (_ k) (k value)))
(def: (conjoint ffa)
(function (_ k)
(ffa (continued k)))))
(def: .public (portal init)
(All (_ i o z)
(-> i
(Cont [(-> i (Cont o z))
i]
z)))
(with_current
(function (_ k)
(do ..monad
[.let [nexus (function (nexus val)
(k [nexus val]))]
_ (k [nexus init])]
(in (undefined))))))
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