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(.module:
[lux #*
[control
pipe
[monad (#+ do)]
["p" parser
["l" text (#+ Parser)]]]
[data
["." error (#+ Error)]
[number
["." nat]]
["." text
["%" format (#+ format)]]
[format
["." context (#+ Context)]]
[collection
["." dictionary]]]])
(def: component
(Parser Text)
(p.rec
(function (_ component)
(do p.monad
[head (l.some (l.none-of "+%&;"))]
($_ p.either
(p.after (p.either l.end
(l.this "&"))
(wrap head))
(do @
[_ (l.this "+")
tail component]
(wrap (format head " " tail)))
(do @
[_ (l.this "%")
code (|> (l.exactly 2 l.hexadecimal)
(p.codec nat.hex)
(:: @ map text.from-code))
tail component]
(wrap (format head code tail))))))))
(def: (form context)
(-> Context (Parser Context))
($_ p.either
(do p.monad
[_ l.end]
(wrap context))
(do p.monad
[key (l.some (l.none-of "=&;"))
key (l.local key ..component)]
(p.either (do @
[_ (l.this "=")
value ..component]
(form (dictionary.put key value context)))
(do @
[_ ($_ p.or
(l.one-of "&;")
l.end)]
(form (dictionary.put key "" context)))))
## if invalid form data, just stop parsing...
(:: p.monad wrap context)))
(def: #export (parameters raw)
(-> Text (Error Context))
(l.run raw (..form context.empty)))
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