{-# language BangPatterns #-}
{-# language PatternSynonyms #-}
{-# language TypeFamilies #-}
module Data.Builder.Catenable
(
Builder(..)
, pattern (:<)
, pattern (:>)
, singleton
, doubleton
, tripleton
, run
) where
import Control.Monad.ST (ST,runST)
import Data.Chunks (Chunks)
import Data.Foldable (foldl')
import GHC.Exts (IsList(..))
import qualified Data.Builder.ST as STB
import qualified Data.Chunks as Chunks
infixr 5 :<
infixl 5 :>
data Builder a
= Empty
| Cons a !(Builder a)
| Snoc !(Builder a) a
| Append !(Builder a) !(Builder a)
instance Monoid (Builder a) where
{-# inline mempty #-}
mempty :: Builder a
mempty = forall a. Builder a
Empty
instance Semigroup (Builder a) where
{-# inline (<>) #-}
<> :: Builder a -> Builder a -> Builder a
(<>) = forall a. Builder a -> Builder a -> Builder a
Append
instance IsList (Builder a) where
type Item (Builder a) = a
toList :: Builder a -> [Item (Builder a)]
toList = forall l. IsList l => l -> [Item l]
toList forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall a. Chunks a -> SmallArray a
Chunks.concat forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall a. Builder a -> Chunks a
run
fromList :: [Item (Builder a)] -> Builder a
fromList = forall (t :: * -> *) b a.
Foldable t =>
(b -> a -> b) -> b -> t a -> b
foldl' (\Builder a
acc a
x -> Builder a
acc forall a. Builder a -> a -> Builder a
:> a
x) forall a. Builder a
Empty
pattern (:<) :: a -> Builder a -> Builder a
pattern $b:< :: forall a. a -> Builder a -> Builder a
$m:< :: forall {r} {a}.
Builder a -> (a -> Builder a -> r) -> ((# #) -> r) -> r
(:<) x y = Cons x y
pattern (:>) :: Builder a -> a -> Builder a
pattern $b:> :: forall a. Builder a -> a -> Builder a
$m:> :: forall {r} {a}.
Builder a -> (Builder a -> a -> r) -> ((# #) -> r) -> r
(:>) x y = Snoc x y
run :: Builder a -> Chunks a
{-# noinline run #-}
run :: forall a. Builder a -> Chunks a
run Builder a
b = forall a. (forall s. ST s a) -> a
runST forall a b. (a -> b) -> a -> b
$ do
Builder s a
bldr0 <- forall s a. ST s (Builder s a)
STB.new
Builder s a
bldr1 <- forall s a. Builder s a -> Builder a -> ST s (Builder s a)
pushCatenable Builder s a
bldr0 Builder a
b
forall s a. Builder s a -> ST s (Chunks a)
STB.freeze Builder s a
bldr1
pushCatenable :: STB.Builder s a -> Builder a -> ST s (STB.Builder s a)
pushCatenable :: forall s a. Builder s a -> Builder a -> ST s (Builder s a)
pushCatenable !Builder s a
bldr0 Builder a
b = case Builder a
b of
Builder a
Empty -> forall (f :: * -> *) a. Applicative f => a -> f a
pure Builder s a
bldr0
Cons a
x Builder a
b1 -> do
Builder s a
bldr1 <- forall a s. a -> Builder s a -> ST s (Builder s a)
STB.push a
x Builder s a
bldr0
forall s a. Builder s a -> Builder a -> ST s (Builder s a)
pushCatenable Builder s a
bldr1 Builder a
b1
Snoc Builder a
b1 a
x -> do
Builder s a
bldr1 <- forall s a. Builder s a -> Builder a -> ST s (Builder s a)
pushCatenable Builder s a
bldr0 Builder a
b1
forall a s. a -> Builder s a -> ST s (Builder s a)
STB.push a
x Builder s a
bldr1
Append Builder a
x Builder a
y -> do
Builder s a
bldr1 <- forall s a. Builder s a -> Builder a -> ST s (Builder s a)
pushCatenable Builder s a
bldr0 Builder a
x
forall s a. Builder s a -> Builder a -> ST s (Builder s a)
pushCatenable Builder s a
bldr1 Builder a
y
singleton :: a -> Builder a
{-# inline singleton #-}
singleton :: forall a. a -> Builder a
singleton a
a = forall a. a -> Builder a -> Builder a
Cons a
a forall a. Builder a
Empty
doubleton :: a -> a -> Builder a
{-# inline doubleton #-}
doubleton :: forall a. a -> a -> Builder a
doubleton a
a a
b = forall a. a -> Builder a -> Builder a
Cons a
a (forall a. a -> Builder a -> Builder a
Cons a
b forall a. Builder a
Empty)
tripleton :: a -> a -> a -> Builder a
{-# inline tripleton #-}
tripleton :: forall a. a -> a -> a -> Builder a
tripleton a
a a
b a
c = forall a. Builder a -> Builder a -> Builder a
Append (forall a. a -> Builder a -> Builder a
Cons a
a (forall a. a -> Builder a -> Builder a
Cons a
b forall a. Builder a
Empty)) (forall a. a -> Builder a -> Builder a
Cons a
c forall a. Builder a
Empty)