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(.module:
[lux #*
[control
["." try (#+ Try)]
["." exception (#+ exception:)]]
[data
["." product]
["." text
["%" format (#+ format)]]
[collection
["." dictionary (#+ Dictionary)]]]
[world
["/" environment]]]
["." //])
(exception: #export (unknown {property /.Property})
(exception.report
["Property" (%.text property)]))
(type: #export (Parser a)
(//.Parser /.Environment a))
(def: #export empty
/.Environment
(dictionary.new text.hash))
(def: #export (property name)
(-> Text (Parser Text))
(function (_ environment)
(case (dictionary.get name environment)
(#.Some value)
(exception.return [environment value])
#.None
(exception.throw ..unknown name))))
(def: #export (run parser environment)
(All [a] (-> (Parser a) /.Environment (Try a)))
(\ try.monad map product.right (parser environment)))
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