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|
(.using
[library
[lux (.except all only)
[meta
["[0]" location]]]]
[//
[functor (.only Functor)]])
(def (list#mix f init xs)
(All (_ a b)
(-> (-> b a a) a (List b) a))
(case xs
{.#End}
init
{.#Item x xs'}
(list#mix f (f x init) xs')))
(def (list#size xs)
(All (_ a) (-> (List a) Nat))
(loop (again [counter 0
xs xs])
(case xs
{.#End}
counter
{.#Item _ xs'}
(again (++ counter) xs'))))
(def (reversed xs)
(All (_ a)
(-> (List a) (List a)))
(list#mix (function (_ head tail) {.#Item head tail})
{.#End}
xs))
(def (pairs xs)
(All (_ a) (-> (List a) (List [a a])))
(case xs
{.#Item x1 {.#Item x2 xs'}}
{.#Item [x1 x2] (pairs xs')}
_
{.#End}))
(type: .public (Monad m)
(Interface
(is (Functor m)
functor)
(is (All (_ a)
(-> a (m a)))
in)
(is (All (_ a)
(-> (m (m a)) (m a)))
conjoint)))
(def .public do
(macro (_ tokens state)
(case (is (Maybe [(Maybe Text) Code (List Code) Code])
(case tokens
(pattern (list [_ {.#Tuple (list [_ {.#Symbol ["" name]}] monad)}] [_ {.#Tuple bindings}] body))
{.#Some [{.#Some name} monad bindings body]}
(pattern (list monad [_ {.#Tuple bindings}] body))
{.#Some [{.#None} monad bindings body]}
_
{.#None}))
{.#Some [?name monad bindings body]}
(if (|> bindings list#size .int ("lux i64 %" +2) ("lux i64 =" +0))
(let [[module short] (symbol ..do)
symbol (is (-> Text Code)
(|>> (.all "lux text concat" module " " short " ") [""] {.#Symbol} [location.dummy]))
g!_ (symbol "_")
g!each (symbol "each")
g!conjoint (symbol "conjoint")
body' (list#mix (is (-> [Code Code] Code Code)
(function (_ binding body')
(with_expansions [<default> (` (|> (~ value) ((~ g!each) (function ((~ g!_) (~ var)) (~ body'))) (~ g!conjoint)))]
(let [[var value] binding]
(case var
[_ {.#Symbol ["" _]}]
<default>
[_ {.#Symbol _}]
(` ((~ var) (~ value) (~ body')))
_
<default>)))))
body
(reversed (pairs bindings)))]
{.#Right [state (list (case ?name
{.#Some name}
(let [name [location.dummy {.#Symbol ["" name]}]]
(` (.case (~ monad)
(~ name)
(.case (~ name)
[(~ g!each) (~' in) (~ g!conjoint)]
(~ body')))))
{.#None}
(` (.case (~ monad)
[(~ g!each) (~' in) (~ g!conjoint)]
(~ body')))))]})
{.#Left "'do' bindings must have an even number of parts."})
{.#None}
{.#Left "Wrong syntax for 'do'"})))
(def .public (then monad f)
(All (_ ! a b)
(-> (Monad !) (-> a (! b))
(-> (! a) (! b))))
(|>> (at monad each f)
(at monad conjoint)))
(def .public (all monad)
(All (_ ! a)
(-> (Monad !) (List (! a))
(! (List a))))
(let [(open "!#[0]") monad]
(function (again xs)
(case xs
{.#End}
(!#in {.#End})
{.#Item x xs'}
(|> x
(!#each (function (_ _x)
(!#each (|>> {.#Item _x}) (again xs'))))
!#conjoint)))))
(def .public (each monad f)
(All (_ M a b)
(-> (Monad M) (-> a (M b)) (List a)
(M (List b))))
(let [(open "!#[0]") monad]
(function (again xs)
(case xs
{.#End}
(!#in {.#End})
{.#Item x xs'}
(|> (f x)
(!#each (function (_ _x)
(!#each (|>> {.#Item _x}) (again xs'))))
!#conjoint)))))
(def .public (only monad f)
(All (_ ! a b)
(-> (Monad !) (-> a (! Bit)) (List a)
(! (List a))))
(let [(open "!#[0]") monad]
(function (again xs)
(case xs
{.#End}
(!#in {.#End})
{.#Item head xs'}
(|> (f head)
(!#each (function (_ verdict)
(!#each (function (_ tail)
(if verdict
{.#Item head tail}
tail))
(again xs'))))
!#conjoint)))))
(def .public (mix monad f init xs)
(All (_ M a b)
(-> (Monad M) (-> b a (M a)) a (List b)
(M a)))
(case xs
{.#End}
(at monad in init)
{.#Item x xs'}
(do monad
[init' (f x init)]
(mix monad f init' xs'))))
|
