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Define generic implementations for Show1.

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This commit is contained in:
Rob Rix 2017-04-06 11:43:01 -04:00
parent 467c808616
commit d9abc56818
1 changed files with 10 additions and 0 deletions
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src/Data/Functor/Classes/Show/Generic.hs
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@ -1,5 +1,7 @@
module Data.Functor.Classes.Show.Generic module Data.Functor.Classes.Show.Generic
( Show1(..) ( Show1(..)
, genericLiftShowsPrec
, genericLiftShowList
, gliftShowsPrec , gliftShowsPrec
, gliftShowList , gliftShowList
) where ) where
@ -17,3 +19,11 @@ class GShow1 f where
-- | showList function for an application of the type constructor based on showsPrec and showList functions for the argument type. The default implementation using standard list syntax is correct for most types. -- | showList function for an application of the type constructor based on showsPrec and showList functions for the argument type. The default implementation using standard list syntax is correct for most types.
gliftShowList :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> [f a] -> ShowS gliftShowList :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> [f a] -> ShowS
gliftShowList sp sl = showListWith (gliftShowsPrec sp sl 0) gliftShowList sp sl = showListWith (gliftShowsPrec sp sl 0)
-- | A suitable implementation of Show1’s liftShowsPrec for Generic1 types.
genericLiftShowsPrec :: (Generic1 f, GShow1 (Rep1 f)) => (Int -> a -> ShowS) -> ([a] -> ShowS) -> Int -> f a -> ShowS
genericLiftShowsPrec sp sl d = gliftShowsPrec sp sl d . from1
-- | A suitable implementation of Show1’s liftShowsPrec for Generic1 types.
genericLiftShowList :: (Generic1 f, GShow1 (Rep1 f)) => (Int -> a -> ShowS) -> ([a] -> ShowS) -> [f a] -> ShowS
genericLiftShowList sp sl = gliftShowList sp sl . map from1