Json.hs

module Rattletrap.Utility.Json
  ( module Rattletrap.Utility.Json
  , Aeson.FromJSON(parseJSON)
  , Aeson.ToJSON(toJSON)
  , Aeson.Value
  , Aeson.encode
  , Aeson.object
  , Aeson.withObject
  , Aeson.withText
  ) where

import qualified Data.Aeson as Aeson
import qualified Data.Aeson.Encode.Pretty as Aeson
import qualified Data.Aeson.Types as Aeson
import qualified Data.ByteString as ByteString
import qualified Data.ByteString.Lazy as LazyByteString
import qualified Data.Text as Text

required
  :: Aeson.FromJSON value => Aeson.Object -> String -> Aeson.Parser value
required object key = object Aeson..: Text.pack key

optional
  :: Aeson.FromJSON value
  => Aeson.Object
  -> String
  -> Aeson.Parser (Maybe value)
optional object key = object Aeson..:? Text.pack key

pair :: (Aeson.ToJSON value, Aeson.KeyValue pair) => String -> value -> pair
pair key value = Text.pack key Aeson..= value

decode :: Aeson.FromJSON a => ByteString.ByteString -> Either String a
decode = Aeson.eitherDecodeStrict'

encodePretty :: Aeson.ToJSON a => a -> LazyByteString.ByteString
encodePretty = Aeson.encodePretty' Aeson.defConfig
  { Aeson.confCompare = compare
  , Aeson.confIndent = Aeson.Tab
  , Aeson.confTrailingNewline = True
  }