{-# LANGUAGE CPP #-}
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE EmptyDataDecls #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE StandaloneDeriving #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
#if __GLASGOW_HASKELL__ >= 702
{-# LANGUAGE DeriveGeneric #-}
#endif
#if __GLASGOW_HASKELL__ >= 706
{-# LANGUAGE PolyKinds #-}
#endif
#if __GLASGOW_HASKELL__ >= 708
{-# LANGUAGE Safe #-}
#elif __GLASGOW_HASKELL__ >= 702
{-# LANGUAGE Trustworthy #-}
#endif
#include "bifunctors-common.h"
module Data.Bifunctor.Biff
( Biff(..)
) where
#if __GLASGOW_HASKELL__ < 710
import Control.Applicative
#endif
import Data.Biapplicative
import Data.Bifoldable
import Data.Bitraversable
#if __GLASGOW_HASKELL__ < 710
import Data.Foldable
import Data.Monoid
import Data.Traversable
#endif
#if __GLASGOW_HASKELL__ >= 708
import Data.Typeable
#endif
#if __GLASGOW_HASKELL__ >= 702
import GHC.Generics
#endif
#if LIFTED_FUNCTOR_CLASSES
import Data.Functor.Classes
#endif
newtype Biff p f g a b = Biff { runBiff :: p (f a) (g b) }
deriving ( Eq, Ord, Show, Read
#if __GLASGOW_HASKELL__ >= 702
, Generic
#endif
#if __GLASGOW_HASKELL__ >= 708
, Typeable
#endif
)
#if __GLASGOW_HASKELL__ >= 702
# if __GLASGOW_HASKELL__ >= 708
deriving instance Functor (p (f a)) => Generic1 (Biff p f g a)
# else
data BiffMetaData
data BiffMetaCons
data BiffMetaSel
instance Datatype BiffMetaData where
datatypeName = const "Biff"
moduleName = const "Data.Bifunctor.Biff"
instance Constructor BiffMetaCons where
conName = const "Biff"
conIsRecord = const True
instance Selector BiffMetaSel where
selName = const "runBiff"
instance Functor (p (f a)) => Generic1 (Biff p f g a) where
type Rep1 (Biff p f g a) = D1 BiffMetaData (C1 BiffMetaCons
(S1 BiffMetaSel (p (f a) :.: Rec1 g)))
from1 = M1 . M1 . M1 . Comp1 . fmap Rec1 . runBiff
to1 = Biff . fmap unRec1 . unComp1 . unM1 . unM1 . unM1
# endif
#endif
#if LIFTED_FUNCTOR_CLASSES
instance (Eq2 p, Eq1 f, Eq1 g, Eq a) => Eq1 (Biff p f g a) where
liftEq = liftEq2 (==)
instance (Eq2 p, Eq1 f, Eq1 g) => Eq2 (Biff p f g) where
liftEq2 f g (Biff x) (Biff y) = liftEq2 (liftEq f) (liftEq g) x y
instance (Ord2 p, Ord1 f, Ord1 g, Ord a) => Ord1 (Biff p f g a) where
liftCompare = liftCompare2 compare
instance (Ord2 p, Ord1 f, Ord1 g) => Ord2 (Biff p f g) where
liftCompare2 f g (Biff x) (Biff y) = liftCompare2 (liftCompare f) (liftCompare g) x y
instance (Read2 p, Read1 f, Read1 g, Read a) => Read1 (Biff p f g a) where
liftReadsPrec = liftReadsPrec2 readsPrec readList
instance (Read2 p, Read1 f, Read1 g) => Read2 (Biff p f g) where
liftReadsPrec2 rp1 rl1 rp2 rl2 p = readParen (p > 10) $ \s0 -> do
("Biff", s1) <- lex s0
("{", s2) <- lex s1
("runBiff", s3) <- lex s2
(x, s4) <- liftReadsPrec2 (liftReadsPrec rp1 rl1) (liftReadList rp1 rl1)
(liftReadsPrec rp2 rl2) (liftReadList rp2 rl2) 0 s3
("}", s5) <- lex s4
return (Biff x, s5)
instance (Show2 p, Show1 f, Show1 g, Show a) => Show1 (Biff p f g a) where
liftShowsPrec = liftShowsPrec2 showsPrec showList
instance (Show2 p, Show1 f, Show1 g) => Show2 (Biff p f g) where
liftShowsPrec2 sp1 sl1 sp2 sl2 p (Biff x) = showParen (p > 10) $
showString "Biff {runBiff = "
. liftShowsPrec2 (liftShowsPrec sp1 sl1) (liftShowList sp1 sl1)
(liftShowsPrec sp2 sl2) (liftShowList sp2 sl2) 0 x
. showChar '}'
#endif
instance (Bifunctor p, Functor f, Functor g) => Bifunctor (Biff p f g) where
first f = Biff . first (fmap f) . runBiff
{-# INLINE first #-}
second f = Biff . second (fmap f) . runBiff
{-# INLINE second #-}
bimap f g = Biff . bimap (fmap f) (fmap g) . runBiff
{-# INLINE bimap #-}
instance (Bifunctor p, Functor g) => Functor (Biff p f g a) where
fmap f = Biff . second (fmap f) . runBiff
{-# INLINE fmap #-}
instance (Biapplicative p, Applicative f, Applicative g) => Biapplicative (Biff p f g) where
bipure a b = Biff (bipure (pure a) (pure b))
{-# INLINE bipure #-}
Biff fg <<*>> Biff xy = Biff (bimap (<*>) (<*>) fg <<*>> xy)
{-# INLINE (<<*>>) #-}
instance (Bifoldable p, Foldable g) => Foldable (Biff p f g a) where
foldMap f = bifoldMap (const mempty) (foldMap f) . runBiff
{-# INLINE foldMap #-}
instance (Bifoldable p, Foldable f, Foldable g) => Bifoldable (Biff p f g) where
bifoldMap f g = bifoldMap (foldMap f) (foldMap g) . runBiff
{-# INLINE bifoldMap #-}
instance (Bitraversable p, Traversable g) => Traversable (Biff p f g a) where
traverse f = fmap Biff . bitraverse pure (traverse f) . runBiff
{-# INLINE traverse #-}
instance (Bitraversable p, Traversable f, Traversable g) => Bitraversable (Biff p f g) where
bitraverse f g = fmap Biff . bitraverse (traverse f) (traverse g) . runBiff
{-# INLINE bitraverse #-}