core/src/Network/Google/Data/JSON.hs · gogol

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gogol/core/src/Network/Google/Data/JSON.hs

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1{-# LANGUAGE DeriveDataTypeable #-}

2{-# LANGUAGE GeneralizedNewtypeDeriving #-}

3{-# LANGUAGE ScopedTypeVariables #-}

5-- |

6-- Module : Network.Google.Data.JSON

8-- License : Mozilla Public License, v. 2.0.

9-- Maintainer : Brendan Hay <brendan.g.hay@gmail.com>

10-- Stability : provisional

11-- Portability : non-portable (GHC extensions)

12--

13module Network.Google.Data.JSON

14 ( JSONValue

15 , Textual (..)

16 , parseJSONObject

17 , parseJSONText

18 , toJSONText

20 -- * Re-exports

21 , FromJSON (..)

22 , ToJSON (..)

24 , withObject

25 , emptyObject

26 , object

28 , (.=)

29 , (.:)

30 , (.:?)

31 , (.!=)

32 ) where

34import Data.Aeson

35import Data.Aeson.Types

36import Data.Data

37import Data.HashMap.Strict (HashMap)

38import Data.Text (Text)

39import qualified Data.Text as Text

40import Servant.API

42type JSONValue = Value

44newtype Textual a = Textual a

45 deriving (Eq, Ord, Read, Show, Num, Fractional, Data, Typeable, FromText, ToText)

47instance (FromJSON a, FromText a) => FromJSON (Textual a) where

48 parseJSON (String s) =

49 case fromText s of

50 Just x -> pure (Textual x)

51 Nothing -> fail $ "Failed to parse value from " ++ Text.unpack s

52 parseJSON o = Textual <$> parseJSON o

54instance ToText a => ToJSON (Textual a) where

55 toJSON (Textual x) = String (toText x)

57parseJSONObject :: FromJSON a => HashMap Text Value -> Parser a

58parseJSONObject = parseJSON . Object

60parseJSONText :: FromText a => String -> Value -> Parser a

61parseJSONText n = withText n (maybe (fail n) pure . fromText)

63toJSONText :: ToText a => a -> Value

64toJSONText = String . toText