{-# LANGUAGE FlexibleContexts #-}
module Data.Tree.Lens
( root
, branches
) where
import Prelude ()
import Control.Lens.Internal.Prelude
import Control.Lens
import Data.Tree
root :: Lens' (Tree a) a
root :: forall a. Lens' (Tree a) a
root a -> f a
f (Node a
a [Tree a]
as) = (forall a. a -> [Tree a] -> Tree a
`Node` [Tree a]
as) forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> a -> f a
f a
a
{-# INLINE root #-}
branches :: Lens' (Tree a) [Tree a]
branches :: forall a. Lens' (Tree a) [Tree a]
branches [Tree a] -> f [Tree a]
f (Node a
a [Tree a]
as) = forall a. a -> [Tree a] -> Tree a
Node a
a forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> [Tree a] -> f [Tree a]
f [Tree a]
as
{-# INLINE branches #-}