module Data.PartialSemigroup.Generics
(
genericPartialSemigroupOp,
PartialSemigroupRep (..),
Generic,
PartialSemigroup (..),
)
where
import Control.Applicative ((<$>), (<*>))
import Data.Maybe (Maybe (..))
import Data.PartialSemigroup
import GHC.Generics
( Generic,
K1 (..),
M1 (..),
Rep,
from,
to,
(:*:) (..),
(:+:) (..),
)
genericPartialSemigroupOp ::
(Generic a, PartialSemigroupRep (Rep a)) =>
a ->
a ->
Maybe a
genericPartialSemigroupOp :: forall a.
(Generic a, PartialSemigroupRep (Rep a)) =>
a -> a -> Maybe a
genericPartialSemigroupOp a
x a
y =
forall a x. Generic a => Rep a x -> a
to forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> forall {k} (rep :: k -> *) (a :: k).
PartialSemigroupRep rep =>
rep a -> rep a -> Maybe (rep a)
repPartialSemigroupOp (forall a x. Generic a => a -> Rep a x
from a
x) (forall a x. Generic a => a -> Rep a x
from a
y)
class PartialSemigroupRep rep where
repPartialSemigroupOp :: rep a -> rep a -> Maybe (rep a)
instance PartialSemigroup a => PartialSemigroupRep (K1 i a) where
repPartialSemigroupOp :: forall (a :: k). K1 i a a -> K1 i a a -> Maybe (K1 i a a)
repPartialSemigroupOp (K1 a
x) (K1 a
y) = forall k i c (p :: k). c -> K1 i c p
K1 forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> (a
x forall a. PartialSemigroup a => a -> a -> Maybe a
<>? a
y)
instance PartialSemigroupRep rep => PartialSemigroupRep (M1 i meta rep) where
repPartialSemigroupOp :: forall (a :: k).
M1 i meta rep a -> M1 i meta rep a -> Maybe (M1 i meta rep a)
repPartialSemigroupOp (M1 rep a
x) (M1 rep a
y) = forall k i (c :: Meta) (f :: k -> *) (p :: k). f p -> M1 i c f p
M1 forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> forall {k} (rep :: k -> *) (a :: k).
PartialSemigroupRep rep =>
rep a -> rep a -> Maybe (rep a)
repPartialSemigroupOp rep a
x rep a
y
instance
(PartialSemigroupRep rep1, PartialSemigroupRep rep2) =>
PartialSemigroupRep (rep1 :*: rep2)
where
repPartialSemigroupOp :: forall (a :: k).
(:*:) rep1 rep2 a -> (:*:) rep1 rep2 a -> Maybe ((:*:) rep1 rep2 a)
repPartialSemigroupOp (rep1 a
x1 :*: rep2 a
x2) (rep1 a
y1 :*: rep2 a
y2) =
forall k (f :: k -> *) (g :: k -> *) (p :: k).
f p -> g p -> (:*:) f g p
(:*:)
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> forall {k} (rep :: k -> *) (a :: k).
PartialSemigroupRep rep =>
rep a -> rep a -> Maybe (rep a)
repPartialSemigroupOp rep1 a
x1 rep1 a
y1
forall (f :: * -> *) a b. Applicative f => f (a -> b) -> f a -> f b
<*> forall {k} (rep :: k -> *) (a :: k).
PartialSemigroupRep rep =>
rep a -> rep a -> Maybe (rep a)
repPartialSemigroupOp rep2 a
x2 rep2 a
y2
instance
(PartialSemigroupRep rep1, PartialSemigroupRep rep2) =>
PartialSemigroupRep (rep1 :+: rep2)
where
repPartialSemigroupOp :: forall (a :: k).
(:+:) rep1 rep2 a -> (:+:) rep1 rep2 a -> Maybe ((:+:) rep1 rep2 a)
repPartialSemigroupOp (L1 rep1 a
x) (L1 rep1 a
y) = forall k (f :: k -> *) (g :: k -> *) (p :: k). f p -> (:+:) f g p
L1 forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> forall {k} (rep :: k -> *) (a :: k).
PartialSemigroupRep rep =>
rep a -> rep a -> Maybe (rep a)
repPartialSemigroupOp rep1 a
x rep1 a
y
repPartialSemigroupOp (R1 rep2 a
x) (R1 rep2 a
y) = forall k (f :: k -> *) (g :: k -> *) (p :: k). g p -> (:+:) f g p
R1 forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> forall {k} (rep :: k -> *) (a :: k).
PartialSemigroupRep rep =>
rep a -> rep a -> Maybe (rep a)
repPartialSemigroupOp rep2 a
x rep2 a
y
repPartialSemigroupOp (:+:) rep1 rep2 a
_ (:+:) rep1 rep2 a
_ = forall a. Maybe a
Nothing