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Rework the Rec instance & add a (bad) NonEmpty instance.

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This commit is contained in:
Rob Rix 2017-09-25 19:49:20 -04:00
parent 600e05a09d
commit da14b3c24a
1 changed files with 12 additions and 12 deletions
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24
src/Data/Mergeable.hs
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@ -3,6 +3,7 @@ module Data.Mergeable where
import Control.Applicative
import Data.Functor.Identity
import Data.List.NonEmpty
import Data.Proxy
import Data.Union
import GHC.Generics
@ -31,9 +32,16 @@ class Functor t => Mergeable t where
-- Instances
instance Mergeable [] where merge = gmerge
instance Mergeable [] where
merge f (x:xs) = ((:) <$> f x <|> pure id) <*> merge f xs
merge _ [] = pure []
instance Mergeable Maybe
instance Mergeable NonEmpty where
merge f (x:|xs) = (:|) <$> f x <*> merge f xs
instance Mergeable Maybe where
merge f (Just a) = Just <$> f a
merge _ Nothing = pure empty
instance Mergeable Identity where merge f = fmap Identity . f . runIdentity
@ -61,8 +69,8 @@ instance GMergeable Par1 where
instance GMergeable (K1 i c) where
gmerge _ (K1 a) = pure (K1 a)
instance GMergeable f => GMergeable (Rec1 f) where
gmerge f (Rec1 a) = Rec1 <$> gmerge f a
instance Mergeable f => GMergeable (Rec1 f) where
gmerge f (Rec1 a) = Rec1 <$> merge f a
instance GMergeable f => GMergeable (M1 i c f) where
gmerge f (M1 a) = M1 <$> gmerge f a
@ -73,11 +81,3 @@ instance (GMergeable f, GMergeable g) => GMergeable (f :+: g) where
instance (GMergeable f, GMergeable g) => GMergeable (f :*: g) where
gmerge f (a :*: b) = (:*:) <$> gmerge f a <*> gmerge f b
instance GMergeable [] where
gmerge f (x:xs) = ((:) <$> f x <|> pure id) <*> gmerge f xs
gmerge _ [] = pure []
instance GMergeable Maybe where
gmerge f (Just a) = Just <$> f a
gmerge _ Nothing = pure empty