Data.Aeson.Extra.Recursive

Helps writing recursive algorithms on Value, for example:

stripNulls :: Value -> Value
stripNulls = cata (embed . f)
 where
   f (ObjectF a) = ObjectF $ HM.filter (== Null) a
   f x = x

Documentation

data ValueF a

An algebra of Value

Since: aeson-extra-0.3.1.0

Constructors

ObjectF (ObjectF a)

ArrayF !(ArrayF a)

StringF !Text

NumberF !Scientific

BoolF !Bool

NullF

Instances

Functor ValueF

Defined in Data.Aeson.Extra.Recursive

Methods

fmap :: (a -> b) -> ValueF a -> ValueF b

(<$) :: a -> ValueF b -> ValueF a

Foldable ValueF

Defined in Data.Aeson.Extra.Recursive

Methods

fold :: Monoid m => ValueF m -> m

foldMap :: Monoid m => (a -> m) -> ValueF a -> m

foldMap' :: Monoid m => (a -> m) -> ValueF a -> m

foldr :: (a -> b -> b) -> b -> ValueF a -> b

foldr' :: (a -> b -> b) -> b -> ValueF a -> b

foldl :: (b -> a -> b) -> b -> ValueF a -> b

foldl' :: (b -> a -> b) -> b -> ValueF a -> b

foldr1 :: (a -> a -> a) -> ValueF a -> a

foldl1 :: (a -> a -> a) -> ValueF a -> a

toList :: ValueF a -> [a]

null :: ValueF a -> Bool

length :: ValueF a -> Int

elem :: Eq a => a -> ValueF a -> Bool

maximum :: Ord a => ValueF a -> a

minimum :: Ord a => ValueF a -> a

sum :: Num a => ValueF a -> a

product :: Num a => ValueF a -> a

Traversable ValueF

Defined in Data.Aeson.Extra.Recursive

Methods

traverse :: Applicative f => (a -> f b) -> ValueF a -> f (ValueF b)

sequenceA :: Applicative f => ValueF (f a) -> f (ValueF a)

mapM :: Monad m => (a -> m b) -> ValueF a -> m (ValueF b)

sequence :: Monad m => ValueF (m a) -> m (ValueF a)

Eq a => Eq (ValueF a)

Defined in Data.Aeson.Extra.Recursive

Methods

(==) :: ValueF a -> ValueF a -> Bool

(/=) :: ValueF a -> ValueF a -> Bool

Data a => Data (ValueF a)

Defined in Data.Aeson.Extra.Recursive

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> ValueF a -> c (ValueF a)

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (ValueF a)

toConstr :: ValueF a -> Constr

dataTypeOf :: ValueF a -> DataType

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c (ValueF a))

dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (ValueF a))

gmapT :: (forall b. Data b => b -> b) -> ValueF a -> ValueF a

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> ValueF a -> r

gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> ValueF a -> r

gmapQ :: (forall d. Data d => d -> u) -> ValueF a -> [u]

gmapQi :: Int -> (forall d. Data d => d -> u) -> ValueF a -> u

gmapM :: Monad m => (forall d. Data d => d -> m d) -> ValueF a -> m (ValueF a)

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> ValueF a -> m (ValueF a)

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> ValueF a -> m (ValueF a)

Read a => Read (ValueF a)

Defined in Data.Aeson.Extra.Recursive

Methods

readsPrec :: Int -> ReadS (ValueF a)

readList :: ReadS [ValueF a]

readPrec :: ReadPrec (ValueF a)

readListPrec :: ReadPrec [ValueF a]

Show a => Show (ValueF a)

Defined in Data.Aeson.Extra.Recursive

Methods

showsPrec :: Int -> ValueF a -> ShowS

show :: ValueF a -> String

showList :: [ValueF a] -> ShowS

type ObjectF a = HashMap Text a

A JSON "object" (key/value map).

Since: aeson-extra-0.3.1.0

type ArrayF a = Vector a

A JSON "array" (sequence).

Since: aeson-extra-0.3.1.0

Orphan instances

Recursive Value

Methods

project :: Value -> Base Value Value

cata :: (Base Value a -> a) -> Value -> a

para :: (Base Value (Value, a) -> a) -> Value -> a

gpara :: (Corecursive Value, Comonad w) => (forall b. Base Value (w b) -> w (Base Value b)) -> (Base Value (EnvT Value w a) -> a) -> Value -> a

prepro :: Corecursive Value => (forall b. Base Value b -> Base Value b) -> (Base Value a -> a) -> Value -> a

gprepro :: (Corecursive Value, Comonad w) => (forall b. Base Value (w b) -> w (Base Value b)) -> (forall c. Base Value c -> Base Value c) -> (Base Value (w a) -> a) -> Value -> a

Corecursive Value

Methods

embed :: Base Value Value -> Value

ana :: (a -> Base Value a) -> a -> Value

apo :: (a -> Base Value (Either Value a)) -> a -> Value

postpro :: Recursive Value => (forall b. Base Value b -> Base Value b) -> (a -> Base Value a) -> a -> Value

gpostpro :: (Recursive Value, Monad m) => (forall b. m (Base Value b) -> Base Value (m b)) -> (forall c. Base Value c -> Base Value c) -> (a -> Base Value (m a)) -> a -> Value