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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 let cond if exec when)
[abstract
["[0]" monad]]
[control
["<>" parser]
["[0]" try]]
[data
["[0]" identity]
[collection
["[0]" list (.use "[1]#[0]" monad)]]]
[math
[number
["n" nat]
["i" int]]]
[meta
["[0]" code (.only)
["<[1]>" \\parser (.only Parser)]]
[macro (.only with_symbols)
[syntax (.only syntax)]]]]])
(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 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]
(.when (list.reversed steps)
(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 when
(syntax (_ [branches (<>.many (<>.and <code>.any <code>.any))
prev <code>.any])
(in (list (` (.when (, prev)
(,* (|> branches
(list#each (function (_ [pattern body]) (list pattern body)))
list#conjoint))))))))
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