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(.using
[library
[lux "*"
[abstract
[monad {"+" do}]]
[control
["[0]" try {"+" Try}]
["[0]" exception {"+" exception:}]]
[data
[collection
[tree {"+" Tree}
["[0]" zipper {"+" Zipper}]]]]]]
["[0]" //])
(type: .public (Parser t a)
(//.Parser (Zipper t) a))
(def: .public (result' parser zipper)
(All (_ t a) (-> (Parser t a) (Zipper t) (Try a)))
(do try.monad
[[zipper output] (//.result parser zipper)]
(in output)))
(def: .public (result parser tree)
(All (_ t a) (-> (Parser t a) (Tree t) (Try a)))
(result' parser (zipper.zipper tree)))
(def: .public value
(All (_ t) (Parser t t))
(function (_ zipper)
{try.#Success [zipper (zipper.value zipper)]}))
(exception: .public cannot_move_further)
(template [<name> <direction>]
[(def: .public <name>
(All (_ t) (Parser t []))
(function (_ zipper)
(case (<direction> zipper)
{.#None}
(exception.except ..cannot_move_further [])
{.#Some next}
{try.#Success [next []]})))]
[down zipper.down]
[up zipper.up]
[right zipper.right]
[rightmost zipper.rightmost]
[left zipper.left]
[leftmost zipper.leftmost]
[next zipper.next]
[end zipper.end]
[previous zipper.previous]
[start zipper.start]
)
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