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(.module:
[lux #*
[control
[parser (#+ Parser)]
["ex" exception (#+ exception:)]
[monad (#+ do)]]
[data
["." error (#+ Error)]
["." text
format]
[collection
["." dictionary (#+ Dictionary)]]]])
(exception: #export (unknown-property {property Text})
(ex.report ["Property" (%t property)]))
(type: #export Context
(Dictionary Text Text))
(type: #export (Property a)
(Parser Context a))
(def: #export empty
Context
(dictionary.new text.Hash<Text>))
(def: #export (property name)
(-> Text (Property Text))
(function (_ context)
(case (dictionary.get name context)
(#.Some value)
(ex.return [context value])
#.None
(ex.throw unknown-property name))))
(def: #export (run context property)
(All [a] (-> Context (Property a) (Error a)))
(case (property context)
(#error.Success [_ output])
(#error.Success output)
(#error.Failure error)
(#error.Failure error)))
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