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(.module:
[library
[lux #*
[abstract
[monad (#+ do)]]
[control
["." try]
["<>" parser
["<.>" code (#+ Parser)]]]
[data
["." identity]
[collection
["." list ("#\." monad)]]]
[macro (#+ with_identifiers)
[syntax (#+ syntax:)]
["." code]]
[math
[number
["n" nat]
["i" int]]]]])
(def: body^
(Parser (List Code))
(<code>.tuple (<>.some <code>.any)))
(syntax: .public (new> [start <code>.any
body body^
prev <code>.any])
(in (list (` (|> (~ start) (~+ body))))))
(syntax: .public (let> [binding <code>.any
body <code>.any
prev <code>.any])
(in (list (` (let [(~ binding) (~ prev)]
(~ body))))))
(def: _reversed_
(Parser Any)
(function (_ tokens)
(#try.Success [(list.reversed tokens) []])))
(syntax: .public (cond> [_ _reversed_
prev <code>.any
else body^
_ _reversed_
branches (<>.some (<>.and body^ body^))])
(with_identifiers [g!temp]
(in (list (` (let [(~ g!temp) (~ prev)]
(cond (~+ (do list.monad
[[test then] branches]
(list (` (|> (~ g!temp) (~+ test)))
(` (|> (~ g!temp) (~+ then))))))
(|> (~ g!temp) (~+ else)))))))))
(syntax: .public (if> [test body^
then body^
else body^
prev <code>.any])
(in (list (` (cond> [(~+ test)] [(~+ then)]
[(~+ else)]
(~ prev))))))
(syntax: .public (when> [test body^
then body^
prev <code>.any])
(in (list (` (cond> [(~+ test)] [(~+ then)]
[]
(~ prev))))))
(syntax: .public (loop> [test body^
then body^
prev <code>.any])
(with_identifiers [g!temp]
(in (list (` (loop [(~ g!temp) (~ prev)]
(if (|> (~ g!temp) (~+ test))
((~' recur) (|> (~ g!temp) (~+ then)))
(~ g!temp))))))))
(syntax: .public (do> [monad <code>.any
steps (<>.some body^)
prev <code>.any])
(with_identifiers [g!temp]
(case (list.reversed steps)
(^ (list& last_step prev_steps))
(let [step_bindings (do list.monad
[step (list.reversed prev_steps)]
(list g!temp (` (|> (~ g!temp) (~+ step)))))]
(in (list (` ((~! do) (~ monad)
[.let [(~ g!temp) (~ prev)]
(~+ step_bindings)]
(|> (~ g!temp) (~+ last_step)))))))
_
(in (list prev)))))
(syntax: .public (exec> [body body^
prev <code>.any])
(with_identifiers [g!temp]
(in (list (` (let [(~ g!temp) (~ prev)]
(exec (|> (~ g!temp) (~+ body))
(~ g!temp))))))))
(syntax: .public (tuple> [paths (<>.many body^)
prev <code>.any])
(with_identifiers [g!temp]
(in (list (` (let [(~ g!temp) (~ prev)]
[(~+ (list\each (function (_ body) (` (|> (~ g!temp) (~+ body))))
paths))]))))))
(syntax: .public (case> [branches (<>.many (<>.and <code>.any <code>.any))
prev <code>.any])
(in (list (` (case (~ prev)
(~+ (|> branches
(list\each (function (_ [pattern body]) (list pattern body)))
list\conjoint)))))))
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