Copyright	(c) Edward Kmett 2013-2019 (c) Paul Wilson 2012
License	BSD3
Maintainer	Edward Kmett <ekmett@gmail.com>
Stability	experimental
Portability	non-portable
Safe Haskell	Trustworthy
Language	Haskell2010

Data.Aeson.Lens

Contents

Numbers
Primitive
Objects and Arrays
Decoding
Pattern Synonyms
Orphan instances

Description

This module also exports orphan Ixed Value and Plated Value instances.

Synopsis

class AsNumber t where
- _Number :: Prism' t Scientific
- _Double :: Prism' t Double
- _Integer :: Prism' t Integer
_Integral :: (AsNumber t, Integral a) => Prism' t a
nonNull :: Prism' Value Value
data Primitive
- = StringPrim !Text
- | NumberPrim !Scientific
- | BoolPrim !Bool
- | NullPrim
class AsNumber t => AsPrimitive t where
- _Primitive :: Prism' t Primitive
- _String :: Prism' t Text
- _Bool :: Prism' t Bool
- _Null :: Prism' t ()
class AsPrimitive t => AsValue t where
- _Value :: Prism' t Value
- _Object :: Prism' t (HashMap Text Value)
- _Array :: Prism' t (Vector Value)
key :: AsValue t => Text -> Traversal' t Value
members :: AsValue t => IndexedTraversal' Text t Value
nth :: AsValue t => Int -> Traversal' t Value
values :: AsValue t => IndexedTraversal' Int t Value
class AsJSON t where
- _JSON :: (FromJSON a, ToJSON b) => Prism t t a b
_JSON' :: (AsJSON t, FromJSON a, ToJSON a) => Prism' t a
pattern JSON :: (FromJSON a, ToJSON a, AsJSON t) => a -> t
pattern Value_ :: (FromJSON a, ToJSON a) => a -> Value
pattern Number_ :: AsNumber t => Scientific -> t
pattern Double :: AsNumber t => Double -> t
pattern Integer :: AsNumber t => Integer -> t
pattern Integral :: (AsNumber t, Integral a) => a -> t
pattern Primitive :: AsPrimitive t => Primitive -> t
pattern Bool_ :: AsPrimitive t => Bool -> t
pattern String_ :: AsPrimitive t => Text -> t
pattern Null_ :: AsPrimitive t => t

Numbers

class AsNumber t where Source #

Minimal complete definition

Nothing

Methods

_Number :: Prism' t Scientific Source #

>>> "[1, \"x\"]" ^? nth 0 . _Number
Just 1.0

>>> "[1, \"x\"]" ^? nth 1 . _Number
Nothing

default _Number :: AsPrimitive t => Prism' t Scientific Source #

_Double :: Prism' t Double Source #

Prism into an Double over a Value, Primitive or Scientific

>>> "[10.2]" ^? nth 0 . _Double
Just 10.2

_Integer :: Prism' t Integer Source #

Prism into an Integer over a Value, Primitive or Scientific

>>> "[10]" ^? nth 0 . _Integer
Just 10

>>> "[10.5]" ^? nth 0 . _Integer
Just 10

>>> "42" ^? _Integer
Just 42

Instances

Instances details

AsNumber ByteString Source #
Instance details Defined in Data.Aeson.Lens Methods _Number :: Prism' ByteString Scientific Source # _Double :: Prism' ByteString Double Source # _Integer :: Prism' ByteString Integer Source #
AsNumber ByteString Source #
Instance details Defined in Data.Aeson.Lens Methods _Number :: Prism' ByteString Scientific Source # _Double :: Prism' ByteString Double Source # _Integer :: Prism' ByteString Integer Source #
AsNumber Scientific Source #
Instance details Defined in Data.Aeson.Lens Methods _Number :: Prism' Scientific Scientific Source # _Double :: Prism' Scientific Double Source # _Integer :: Prism' Scientific Integer Source #
AsNumber String Source #
Instance details Defined in Data.Aeson.Lens Methods _Number :: Prism' String Scientific Source # _Double :: Prism' String Double Source # _Integer :: Prism' String Integer Source #
AsNumber Text Source #
Instance details Defined in Data.Aeson.Lens Methods _Number :: Prism' Text Scientific Source # _Double :: Prism' Text Double Source # _Integer :: Prism' Text Integer Source #
AsNumber Value Source #
Instance details Defined in Data.Aeson.Lens Methods _Number :: Prism' Value Scientific Source # _Double :: Prism' Value Double Source # _Integer :: Prism' Value Integer Source #
AsNumber Text Source #
Instance details Defined in Data.Aeson.Lens Methods _Number :: Prism' Text Scientific Source # _Double :: Prism' Text Double Source # _Integer :: Prism' Text Integer Source #
AsNumber Primitive Source #
Instance details Defined in Data.Aeson.Lens Methods _Number :: Prism' Primitive Scientific Source # _Double :: Prism' Primitive Double Source # _Integer :: Prism' Primitive Integer Source #

_Integral :: (AsNumber t, Integral a) => Prism' t a Source #

Access Integer Values as Integrals.

>>> "[10]" ^? nth 0 . _Integral
Just 10

>>> "[10.5]" ^? nth 0 . _Integral
Just 10

nonNull :: Prism' Value Value Source #

Prism into non-Null values

>>> "{\"a\": \"xyz\", \"b\": null}" ^? key "a" . nonNull
Just (String "xyz")

>>> "{\"a\": {}, \"b\": null}" ^? key "a" . nonNull
Just (Object (fromList []))

>>> "{\"a\": \"xyz\", \"b\": null}" ^? key "b" . nonNull
Nothing

Primitive

data Primitive Source #

Primitives of Value

Constructors

StringPrim !Text
NumberPrim !Scientific
BoolPrim !Bool
NullPrim

Instances

Instances details

Eq Primitive Source #
Instance details Defined in Data.Aeson.Lens Methods (==) :: Primitive -> Primitive -> Bool # (/=) :: Primitive -> Primitive -> Bool #
Data Primitive Source #
Instance details Defined in Data.Aeson.Lens Methods gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> Primitive -> c Primitive # gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c Primitive # toConstr :: Primitive -> Constr # dataTypeOf :: Primitive -> DataType # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c Primitive) # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c Primitive) # gmapT :: (forall b. Data b => b -> b) -> Primitive -> Primitive # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Primitive -> r # gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Primitive -> r # gmapQ :: (forall d. Data d => d -> u) -> Primitive -> [u] # gmapQi :: Int -> (forall d. Data d => d -> u) -> Primitive -> u # gmapM :: Monad m => (forall d. Data d => d -> m d) -> Primitive -> m Primitive # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Primitive -> m Primitive # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Primitive -> m Primitive #
Ord Primitive Source #
Instance details Defined in Data.Aeson.Lens Methods compare :: Primitive -> Primitive -> Ordering # (<) :: Primitive -> Primitive -> Bool # (<=) :: Primitive -> Primitive -> Bool # (>) :: Primitive -> Primitive -> Bool # (>=) :: Primitive -> Primitive -> Bool # max :: Primitive -> Primitive -> Primitive # min :: Primitive -> Primitive -> Primitive #
Show Primitive Source #
Instance details Defined in Data.Aeson.Lens Methods showsPrec :: Int -> Primitive -> ShowS # show :: Primitive -> String # showList :: [Primitive] -> ShowS #
AsPrimitive Primitive Source #
Instance details Defined in Data.Aeson.Lens Methods _Primitive :: Prism' Primitive Primitive Source # _String :: Prism' Primitive Text Source # _Bool :: Prism' Primitive Bool Source # _Null :: Prism' Primitive () Source #
AsNumber Primitive Source #
Instance details Defined in Data.Aeson.Lens Methods _Number :: Prism' Primitive Scientific Source # _Double :: Prism' Primitive Double Source # _Integer :: Prism' Primitive Integer Source #

class AsNumber t => AsPrimitive t where Source #

Minimal complete definition

Nothing

Methods

_Primitive :: Prism' t Primitive Source #

>>> "[1, \"x\", null, true, false]" ^? nth 0 . _Primitive
Just (NumberPrim 1.0)

>>> "[1, \"x\", null, true, false]" ^? nth 1 . _Primitive
Just (StringPrim "x")

>>> "[1, \"x\", null, true, false]" ^? nth 2 . _Primitive
Just NullPrim

>>> "[1, \"x\", null, true, false]" ^? nth 3 . _Primitive
Just (BoolPrim True)

>>> "[1, \"x\", null, true, false]" ^? nth 4 . _Primitive
Just (BoolPrim False)

default _Primitive :: AsValue t => Prism' t Primitive Source #

_String :: Prism' t Text Source #

>>> "{\"a\": \"xyz\", \"b\": true}" ^? key "a" . _String
Just "xyz"

>>> "{\"a\": \"xyz\", \"b\": true}" ^? key "b" . _String
Nothing

>>> _Object._Wrapped # [("key" :: Text, _String # "value")] :: String
"{\"key\":\"value\"}"

_Bool :: Prism' t Bool Source #

>>> "{\"a\": \"xyz\", \"b\": true}" ^? key "b" . _Bool
Just True

>>> "{\"a\": \"xyz\", \"b\": true}" ^? key "a" . _Bool
Nothing

>>> _Bool # True :: String
"true"

>>> _Bool # False :: String
"false"

_Null :: Prism' t () Source #

>>> "{\"a\": \"xyz\", \"b\": null}" ^? key "b" . _Null
Just ()

>>> "{\"a\": \"xyz\", \"b\": null}" ^? key "a" . _Null
Nothing

>>> _Null # () :: String
"null"

Instances

Instances details

AsPrimitive ByteString Source #
Instance details Defined in Data.Aeson.Lens Methods _Primitive :: Prism' ByteString Primitive Source # _String :: Prism' ByteString Text Source # _Bool :: Prism' ByteString Bool Source # _Null :: Prism' ByteString () Source #
AsPrimitive ByteString Source #
Instance details Defined in Data.Aeson.Lens Methods _Primitive :: Prism' ByteString Primitive Source # _String :: Prism' ByteString Text Source # _Bool :: Prism' ByteString Bool Source # _Null :: Prism' ByteString () Source #
AsPrimitive String Source #
Instance details Defined in Data.Aeson.Lens Methods _Primitive :: Prism' String Primitive Source # _String :: Prism' String Text Source # _Bool :: Prism' String Bool Source # _Null :: Prism' String () Source #
AsPrimitive Text Source #
Instance details Defined in Data.Aeson.Lens Methods _Primitive :: Prism' Text Primitive Source # _String :: Prism' Text Text Source # _Bool :: Prism' Text Bool Source # _Null :: Prism' Text () Source #
AsPrimitive Value Source #
Instance details Defined in Data.Aeson.Lens Methods _Primitive :: Prism' Value Primitive Source # _String :: Prism' Value Text Source # _Bool :: Prism' Value Bool Source # _Null :: Prism' Value () Source #
AsPrimitive Text Source #
Instance details Defined in Data.Aeson.Lens Methods _Primitive :: Prism' Text Primitive Source # _String :: Prism' Text Text0 Source # _Bool :: Prism' Text Bool Source # _Null :: Prism' Text () Source #
AsPrimitive Primitive Source #
Instance details Defined in Data.Aeson.Lens Methods _Primitive :: Prism' Primitive Primitive Source # _String :: Prism' Primitive Text Source # _Bool :: Prism' Primitive Bool Source # _Null :: Prism' Primitive () Source #

Objects and Arrays

class AsPrimitive t => AsValue t where Source #

Minimal complete definition

_Value

Methods

_Value :: Prism' t Value Source #

>>> preview _Value "[1,2,3]" == Just (Array (Vector.fromList [Number 1.0,Number 2.0,Number 3.0]))
True

_Object :: Prism' t (HashMap Text Value) Source #

>>> "{\"a\": {}, \"b\": null}" ^? key "a" . _Object
Just (fromList [])

>>> "{\"a\": {}, \"b\": null}" ^? key "b" . _Object
Nothing

>>> _Object._Wrapped # [("key" :: Text, _String # "value")] :: String
"{\"key\":\"value\"}"

_Array :: Prism' t (Vector Value) Source #

>>> preview _Array "[1,2,3]" == Just (Vector.fromList [Number 1.0,Number 2.0,Number 3.0])
True

Instances

Instances details

AsValue ByteString Source #
Instance details Defined in Data.Aeson.Lens Methods _Value :: Prism' ByteString Value Source # _Object :: Prism' ByteString (HashMap Text Value) Source # _Array :: Prism' ByteString (Vector Value) Source #
AsValue ByteString Source #
Instance details Defined in Data.Aeson.Lens Methods _Value :: Prism' ByteString Value Source # _Object :: Prism' ByteString (HashMap Text Value) Source # _Array :: Prism' ByteString (Vector Value) Source #
AsValue String Source #
Instance details Defined in Data.Aeson.Lens Methods _Value :: Prism' String Value Source # _Object :: Prism' String (HashMap Text Value) Source # _Array :: Prism' String (Vector Value) Source #
AsValue Text Source #
Instance details Defined in Data.Aeson.Lens Methods _Value :: Prism' Text Value Source # _Object :: Prism' Text (HashMap Text Value) Source # _Array :: Prism' Text (Vector Value) Source #
AsValue Value Source #
Instance details Defined in Data.Aeson.Lens Methods _Value :: Prism' Value Value Source # _Object :: Prism' Value (HashMap Text Value) Source # _Array :: Prism' Value (Vector Value) Source #
AsValue Text Source #
Instance details Defined in Data.Aeson.Lens Methods _Value :: Prism' Text Value Source # _Object :: Prism' Text (HashMap Text0 Value) Source # _Array :: Prism' Text (Vector Value) Source #

key :: AsValue t => Text -> Traversal' t Value Source #

Like ix, but for Object with Text indices. This often has better inference than ix when used with OverloadedStrings.

>>> "{\"a\": 100, \"b\": 200}" ^? key "a"
Just (Number 100.0)

>>> "[1,2,3]" ^? key "a"
Nothing

members :: AsValue t => IndexedTraversal' Text t Value Source #

An indexed Traversal into Object properties

>>> Data.List.sort ("{\"a\": 4, \"b\": 7}" ^@.. members . _Number)
[("a",4.0),("b",7.0)]

>>> "{\"a\": 4}" & members . _Number *~ 10
"{\"a\":40}"

nth :: AsValue t => Int -> Traversal' t Value Source #

Like ix, but for Arrays with Int indexes

>>> "[1,2,3]" ^? nth 1
Just (Number 2.0)

>>> "{\"a\": 100, \"b\": 200}" ^? nth 1
Nothing

>>> "[1,2,3]" & nth 1 .~ Number 20
"[1,20,3]"

values :: AsValue t => IndexedTraversal' Int t Value Source #

An indexed Traversal into Array elements

>>> "[1,2,3]" ^.. values
[Number 1.0,Number 2.0,Number 3.0]

>>> "[1,2,3]" & values . _Number *~ 10
"[10,20,30]"

Decoding

class AsJSON t where Source #

Methods

_JSON :: (FromJSON a, ToJSON b) => Prism t t a b Source #

_JSON is a Prism from something containing JSON to something encoded in that structure

Instances

Instances details

AsJSON ByteString Source #
Instance details Defined in Data.Aeson.Lens Methods _JSON :: (FromJSON a, ToJSON b) => Prism ByteString ByteString a b Source #
AsJSON ByteString Source #
Instance details Defined in Data.Aeson.Lens Methods _JSON :: (FromJSON a, ToJSON b) => Prism ByteString ByteString a b Source #
AsJSON String Source #
Instance details Defined in Data.Aeson.Lens Methods _JSON :: (FromJSON a, ToJSON b) => Prism String String a b Source #
AsJSON Text Source #
Instance details Defined in Data.Aeson.Lens Methods _JSON :: (FromJSON a, ToJSON b) => Prism Text Text a b Source #
AsJSON Value Source #
Instance details Defined in Data.Aeson.Lens Methods _JSON :: (FromJSON a, ToJSON b) => Prism Value Value a b Source #
AsJSON Text Source #
Instance details Defined in Data.Aeson.Lens Methods _JSON :: (FromJSON a, ToJSON b) => Prism Text Text a b Source #

_JSON' :: (AsJSON t, FromJSON a, ToJSON a) => Prism' t a Source #

Pattern Synonyms

pattern JSON :: (FromJSON a, ToJSON a, AsJSON t) => a -> t Source #

pattern Value_ :: (FromJSON a, ToJSON a) => a -> Value Source #

pattern Number_ :: AsNumber t => Scientific -> t Source #

pattern Double :: AsNumber t => Double -> t Source #

pattern Integer :: AsNumber t => Integer -> t Source #

pattern Integral :: (AsNumber t, Integral a) => a -> t Source #

pattern Primitive :: AsPrimitive t => Primitive -> t Source #

pattern Bool_ :: AsPrimitive t => Bool -> t Source #

pattern String_ :: AsPrimitive t => Text -> t Source #

pattern Null_ :: AsPrimitive t => t Source #

Orphan instances

Ixed Value Source #
Instance details Methods ix :: Index Value -> Traversal' Value (IxValue Value) #
Plated Value Source #
Instance details Methods plate :: Traversal' Value Value #