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... https://en.wikipedia.org/wiki/Percent-encoding
(.require
[library
[lux (.except)
[abstract
[monad (.only do)]]
[control
["[0]" try (.only Try)]
["[0]" exception (.only Exception)]]
[data
["[0]" text (.only)
[char (.only Char)]]
[collection
["[0]" set (.only Set)]]]
[math
[number
["[0]" nat]]]]])
(type .public URI_Encoded
Text)
(with_expansions [<reserved> (these [" " "%20"]
["!" "%21"]
["#" "%23"]
["$" "%24"]
["%" "%25"]
["&" "%26"]
["'" "%27"]
["(" "%28"]
[")" "%29"]
["*" "%2A"]
["+" "%2B"]
["," "%2C"]
["/" "%2F"]
[":" "%3A"]
[";" "%3B"]
["=" "%3D"]
["?" "%3F"]
["@" "%40"]
["[" "%5B"]
["]" "%5D"])]
(def .public reserved
(Set Char)
(set.of_list nat.hash
(`` (list (,, (with_template [<char> <encoding>]
[(char <char>)]
<reserved>))))))
(def .public (encoded input)
(-> Text URI_Encoded)
(let [size (text.size input)]
(loop (again [index 0
slice_start 0
output ""])
(if (nat.< size index)
(`` (when (.text_char# index input)
(,, (with_template [<char> <encoding>]
[(char <char>)
(let [index' (++ index)]
(again index'
index'
(.text_composite# output
(.text_clip# slice_start (nat.- slice_start index) input)
<encoding>)))]
<reserved>))
_
(again (++ index)
slice_start
output)))
(.text_composite# output
(.text_clip# slice_start (nat.- slice_start index) input))))))
)
(def escape (char "%"))
(exception.def (invalid it)
(Exception URI_Encoded)
(exception.report
(list ["Value" (text.format it)])))
(def .public (decoded input)
(-> URI_Encoded (Try Text))
(let [size (text.size input)]
(loop (again [index 0
slice_start 0
output ""])
(if (nat.< size index)
(`` (when (.text_char# index input)
..escape
(let [encoding_start (++ index)
encoding_end (++ encoding_start)]
(if (nat.< size encoding_end)
(do try.monad
[value (|> input
(.text_clip# encoding_start 2)
(at nat.hex decoded))
.let [index' (++ encoding_end)]]
(again index'
index'
(.text_composite# output
(.text_clip# slice_start (nat.- slice_start index) input)
(text.of_char value))))
(exception.except ..invalid [input])))
_
(again (++ index)
slice_start
output)))
{try.#Success (|> input
(.text_clip# slice_start (nat.- slice_start index))
(.text_composite# output))}))))
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