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... This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
... If a copy of the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
(.require
[library
[lux (.except for)
[abstract
[equivalence (.only Equivalence)]
[monoid (.only Monoid)]
[monad (.only do)]]
[control
["<>" parser]
["[0]" maybe (.use "[1]#[0]" functor)]
["[0]" exception]]
[data
["[0]" text (.use "[1]#[0]" equivalence)
["%" \\format]
["<[1]>" \\parser (.only Parser)]]
[collection
["[0]" list (.use "[1]#[0]" functor mix)
["/" property]]]]
[math
[number (.only hex)]]
["[0]" meta (.only)
["[0]" code (.only)
["<[1]>" \\parser]]
[macro
[syntax (.only syntax)]]]]])
(type .public Configuration
(/.List Text))
(def .public equivalence
(Equivalence Configuration)
(/.equivalence text.equivalence))
(def .public monoid
(Monoid Configuration)
/.monoid)
(def .public empty
Configuration
/.empty)
(with_template [<ascii> <name>]
[(def <name>
Text
(text.of_char (hex <ascii>)))]
["02" start]
["03" end]
)
(def format'
(-> Text Text)
(text.enclosed [..start ..end]))
(def .public format
(%.Format Configuration)
(|>> (list#each (function (_ [feature value])
(%.format (..format' feature) (..format' value))))
text.together))
(def .public parser
(Parser Configuration)
(let [parser' (is (Parser Text)
(<| (<>.after (<text>.this ..start))
(<>.before (<text>.this ..end))
(<text>.slice (<text>.some! (<text>.none_of! ..end)))))]
(<>.some (<>.and parser' parser'))))
(exception.def .public invalid)
(def configuration
(<code>.Parser Configuration)
(<code>.tuple (<>.some (<>.and <code>.text <code>.text))))
(def (subsumes? actual expected)
(-> Configuration Configuration Bit)
(when expected
{.#End}
true
{.#Item [feature value] tail}
(and (|> actual
(/.value feature)
(maybe#each (text#= value))
(maybe.else false))
(subsumes? expected tail))))
(def .public for
(syntax (_ [specializations (<>.some (<>.and ..configuration <code>.any))
default (<>.maybe <code>.any)])
(do meta.monad
[actual meta.configuration]
(when (list#mix (function (_ [expected then] choice)
(if (subsumes? actual expected)
{.#Some then}
choice))
default
specializations)
{.#Some it}
(in (list it))
{.#None}
(meta.failure (exception.error ..invalid []))))))
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