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(.require
[library
[lux (.except let cond if exec case)
[abstract
["[0]" monad]]
[control
["<>" parser]
["[0]" try]]
[data
["[0]" identity]
[collection
["[0]" list (.use "[1]#[0]" monad)]]]
[macro (.only with_symbols)
[syntax (.only syntax)]
["[0]" code (.only)
["<[1]>" \\parser (.only Parser)]]]
[math
[number
["n" nat]
["i" int]]]]])
(def body
(Parser (List Code))
(<code>.tuple (<>.some <code>.any)))
(def .public new
(syntax (_ [start <code>.any
body ..body
prev <code>.any])
(in (list (` (|> (~ start) (~+ body)))))))
(def .public let
(syntax (_ [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) []]}))
(def .public cond
(syntax (_ [_ _reversed_
prev <code>.any
else ..body
_ _reversed_
branches (<>.some (<>.and ..body ..body))])
(with_symbols [g!temp]
(in (list (` (.let [(~ g!temp) (~ prev)]
(.cond (~+ (monad.do list.monad
[[test then] branches]
(list (` (|> (~ g!temp) (~+ test)))
(` (|> (~ g!temp) (~+ then))))))
(|> (~ g!temp) (~+ else))))))))))
(def .public if
(syntax (_ [test ..body
then ..body
else ..body
prev <code>.any])
(in (list (` (..cond [(~+ test)] [(~+ then)]
[(~+ else)]
(~ prev)))))))
(def .public when
(syntax (_ [test ..body
then ..body
prev <code>.any])
(in (list (` (..cond [(~+ test)] [(~+ then)]
[]
(~ prev)))))))
(def .public while
(syntax (_ [test ..body
then ..body
prev <code>.any])
(with_symbols [g!temp g!again]
(in (list (` (.loop ((~ g!again) [(~ g!temp) (~ prev)])
(.if (|> (~ g!temp) (~+ test))
((~ g!again) (|> (~ g!temp) (~+ then)))
(~ g!temp)))))))))
(def .public do
(syntax (_ [monad <code>.any
steps (<>.some ..body)
prev <code>.any])
(with_symbols [g!temp]
(.case (list.reversed steps)
(pattern (list.partial last_step prev_steps))
(.let [step_bindings (monad.do list.monad
[step (list.reversed prev_steps)]
(list g!temp (` (|> (~ g!temp) (~+ step)))))]
(in (list (` ((~! monad.do) (~ monad)
[.let [(~ g!temp) (~ prev)]
(~+ step_bindings)]
(|> (~ g!temp) (~+ last_step)))))))
_
(in (list prev))))))
(def .public exec
(syntax (_ [body ..body
prev <code>.any])
(with_symbols [g!temp]
(in (list (` (.let [(~ g!temp) (~ prev)]
(.exec (|> (~ g!temp) (~+ body))
(~ g!temp)))))))))
(def .public tuple
(syntax (_ [paths (<>.many ..body)
prev <code>.any])
(with_symbols [g!temp]
(in (list (` (.let [(~ g!temp) (~ prev)]
[(~+ (list#each (function (_ body) (` (|> (~ g!temp) (~+ body))))
paths))])))))))
(def .public case
(syntax (_ [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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