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... https://en.wikipedia.org/wiki/Named_parameter
(.require
[library
[lux (.except def)
[abstract
["[0]" monad (.only do)]]
[control
["?" parser]
["[0]" maybe]
["[0]" exception (.only Exception)]]
[data
["[0]" text (.only)
["%" \\format]]
[collection
["[0]" list (.use "[1]#[0]" monad)]
["[0]" set]
["[0]" dictionary]]]
[math
[number
["n" nat]]]
["[0]" meta (.only)
["[0]" code (.only)
["?[1]" \\parser]]
[macro (.only with_symbols)
[syntax (.only syntax)
["[0]" export]]]]]])
(exception.def .public (duplicate_parameters [definition parameters])
(Exception [Symbol (List Text)])
(exception.report
(list ["Definition" (%.symbol definition)]
["Parameters" (%.list %.text parameters)])))
(exception.def .public (invalid_parameters [definition expected actual])
(Exception [Symbol (List Text) (List Text)])
(exception.report
(list ["Definition" (%.symbol definition)]
["Expected" (%.list %.text expected)]
["Actual" (%.list %.text actual)])))
(.def .public def
(syntax (_ [[exported? [name parameters] type body]
(export.with (all ?.and
(?code.form (?.and ?code.local (?.some ?code.local)))
?code.any
?code.any))])
(do meta.monad
[here meta.current_module_name]
(if (n.= (list.size parameters)
(set.size (set.of_list text.hash parameters)))
(with_symbols [g!function g!parameters g!_ g!it]
(with_expansions [<invalid_parameters> (meta.failure (exception.error ..invalid_parameters [(symbol (, (code.symbol [here name])))
(list (,* (list#each code.text parameters)))
(dictionary.keys (, g!parameters))]))]
(in (list (` (.def (, exported?) ((, g!function) (,* (list#each code.local parameters)))
(, type)
(, body)))
(` (.def (, exported?) (, (code.local name))
(syntax ((, (code.local name)) [(, g!parameters) (?.some (?.and ?code.local ?code.any))])
(let [(, g!parameters) (dictionary.of_list text.hash (, g!parameters))]
(when (dictionary.size (, g!parameters))
(, (code.nat (list.size parameters)))
(when (monad.each maybe.monad
(function ((, g!_) (, g!it))
(dictionary.value (, g!it) (, g!parameters)))
(list (,* (list#each code.text parameters))))
{.#Some (, g!parameters)}
(of meta.monad (,' in)
(list (` ((, g!function) ((,' .,*) (, g!parameters))))))
{.#None}
<invalid_parameters>)
(, g!_)
<invalid_parameters>)))))))))
(meta.failure (exception.error ..duplicate_parameters [[here name] parameters]))))))
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