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101 lines
2.7 KiB
Haskell
101 lines
2.7 KiB
Haskell
-- A module for representing encoded json
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-- and efficient operations to construct them
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module Hasura.EncJSON
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( EncJSON
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, encJFromBuilder
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, encJToLBS
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, encJToBS
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, encJFromJValue
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, encJFromChar
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, encJFromText
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, encJFromBS
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, encJFromLBS
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, encJFromList
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, encJFromAssocList
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, encJFromInsOrdHashMap
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) where
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import Hasura.Prelude
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import qualified Data.Aeson as J
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import qualified Data.ByteString as B
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import qualified Data.ByteString.Builder as BB
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import qualified Data.ByteString.Lazy as BL
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import qualified Data.Text.Encoding as TE
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import qualified Database.PG.Query as Q
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import qualified Data.HashMap.Strict.InsOrd as OMap
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-- encoded json
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-- TODO (from master): can be improved with gadts capturing bytestring, lazybytestring
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-- and builder
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newtype EncJSON
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= EncJSON { unEncJSON :: BB.Builder }
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deriving (Semigroup, Monoid, IsString)
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instance Show EncJSON where
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showsPrec d x = showParen (d > 10) $
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showString "encJFromBS " . showsPrec 11 (encJToLBS x)
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instance Eq EncJSON where
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(==) = (==) `on` encJToLBS
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instance Q.FromCol EncJSON where
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fromCol = fmap encJFromBS . Q.fromCol
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encJToLBS :: EncJSON -> BL.ByteString
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encJToLBS = BB.toLazyByteString . unEncJSON
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{-# INLINE encJToLBS #-}
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encJToBS :: EncJSON -> B.ByteString
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encJToBS = BL.toStrict . encJToLBS
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{-# INLINE encJToBS #-}
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encJFromBuilder :: BB.Builder -> EncJSON
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encJFromBuilder = EncJSON
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{-# INLINE encJFromBuilder #-}
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encJFromBS :: B.ByteString -> EncJSON
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encJFromBS = EncJSON . BB.byteString
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{-# INLINE encJFromBS #-}
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encJFromLBS :: BL.ByteString -> EncJSON
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encJFromLBS = EncJSON . BB.lazyByteString
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{-# INLINE encJFromLBS #-}
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encJFromJValue :: J.ToJSON a => a -> EncJSON
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encJFromJValue = encJFromBuilder . J.fromEncoding . J.toEncoding
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{-# INLINE encJFromJValue #-}
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encJFromChar :: Char -> EncJSON
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encJFromChar = EncJSON . BB.charUtf8
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{-# INLINE encJFromChar #-}
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encJFromText :: Text -> EncJSON
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encJFromText = encJFromBS . TE.encodeUtf8
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{-# INLINE encJFromText #-}
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encJFromList :: [EncJSON] -> EncJSON
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encJFromList = \case
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[] -> "[]"
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x:xs -> encJFromChar '['
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<> x
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<> foldr go (encJFromChar ']') xs
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where go v b = encJFromChar ',' <> v <> b
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-- from association list
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encJFromAssocList :: [(Text, EncJSON)] -> EncJSON
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encJFromAssocList = \case
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[] -> "{}"
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x:xs -> encJFromChar '{'
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<> builder' x
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<> foldr go (encJFromChar '}') xs
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where
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go v b = encJFromChar ',' <> builder' v <> b
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-- builds "key":value from (key,value)
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builder' (t, v) =
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encJFromChar '"' <> encJFromText t <> encJFromText "\":" <> v
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encJFromInsOrdHashMap :: InsOrdHashMap Text EncJSON -> EncJSON
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encJFromInsOrdHashMap = encJFromAssocList . OMap.toList
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