{-# LANGUAGE CPP #-}
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE GADTs #-}
{-# LANGUAGE TemplateHaskellQuotes #-}

module Data.Aeson.Key (
    Key,
    fromString,
    toString,
    toText,
    fromText,
    coercionToText,
    toShortText,
    fromShortText,
) where

import Prelude (Eq, Ord, (.), Show (..), String, Maybe (..))

import Control.Applicative ((<$>))
import Control.DeepSeq (NFData(..))
import Data.Data (Data)
import Data.Hashable (Hashable(..))
import Data.Monoid (Monoid(mempty, mappend))
import Data.Semigroup (Semigroup((<>)))
import Data.Text (Text)
import Data.Type.Coercion (Coercion (..))
import Data.Typeable (Typeable)
import Text.Read (Read (..))

import qualified Data.String
import qualified Data.Text as T
import qualified Data.Text.Short as ST
import qualified Language.Haskell.TH.Syntax as TH

newtype Key = Key { Key -> Text
unKey :: Text }
  deriving (Key -> Key -> Bool
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Data)

fromString :: String -> Key
fromString :: String -> Key
fromString = Text -> Key
Key (Text -> Key) -> (String -> Text) -> String -> Key
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. String -> Text
T.pack

toString :: Key -> String
toString :: Key -> String
toString (Key Text
k) = Text -> String
T.unpack Text
k

fromText :: Text -> Key
fromText :: Text -> Key
fromText = Text -> Key
Key

toText :: Key -> Text
toText :: Key -> Text
toText = Key -> Text
unKey

-- | @'coercing r1 r2'@ will evaluate to @r1@ if 'Key' is 'Coercible' to  'Text',
-- and to @r2@ otherwise.
--
-- Using 'coercing' we can make more efficient implementations
-- when 'Key' is backed up by 'Text' without exposing internals.
-- 
coercionToText :: Maybe (Coercion Key Text)
coercionToText :: Maybe (Coercion Key Text)
coercionToText = Coercion Key Text -> Maybe (Coercion Key Text)
forall a. a -> Maybe a
Just Coercion Key Text
forall k (a :: k) (b :: k). Coercible a b => Coercion a b
Coercion
{-# INLINE coercionToText #-}

-- | @since 2.0.2.0
toShortText :: Key -> ST.ShortText
toShortText :: Key -> ShortText
toShortText = Text -> ShortText
ST.fromText (Text -> ShortText) -> (Key -> Text) -> Key -> ShortText
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Key -> Text
unKey

-- | @since 2.0.2.0
fromShortText :: ST.ShortText -> Key
fromShortText :: ShortText -> Key
fromShortText = Text -> Key
Key (Text -> Key) -> (ShortText -> Text) -> ShortText -> Key
forall b c a. (b -> c) -> (a -> b) -> a -> c
. ShortText -> Text
ST.toText

-------------------------------------------------------------------------------
-- instances
-------------------------------------------------------------------------------

instance Read Key where
    readPrec :: ReadPrec Key
readPrec = String -> Key
fromString (String -> Key) -> ReadPrec String -> ReadPrec Key
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> ReadPrec String
forall a. Read a => ReadPrec a
readPrec

instance Show Key where
    showsPrec :: Int -> Key -> ShowS
showsPrec Int
d (Key Text
k) = Int -> Text -> ShowS
forall a. Show a => Int -> a -> ShowS
showsPrec Int
d Text
k 

instance Data.String.IsString Key where
    fromString :: String -> Key
fromString = String -> Key
fromString

instance Hashable Key where
    hashWithSalt :: Int -> Key -> Int
hashWithSalt Int
salt (Key Text
k) = Int -> Text -> Int
forall a. Hashable a => Int -> a -> Int
hashWithSalt Int
salt Text
k

instance NFData Key where
    rnf :: Key -> ()
rnf (Key Text
k) = Text -> ()
forall a. NFData a => a -> ()
rnf Text
k

instance Semigroup Key where
    Key Text
x <> :: Key -> Key -> Key
<> Key Text
y = Text -> Key
Key (Text
x Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
y)

instance Monoid Key where
    mempty :: Key
mempty = Text -> Key
Key Text
forall a. Monoid a => a
mempty
    mappend :: Key -> Key -> Key
mappend = Key -> Key -> Key
forall a. Semigroup a => a -> a -> a
(<>)

instance TH.Lift Key where
#if MIN_VERSION_text(1,2,4)
    lift :: Key -> Q Exp
lift (Key Text
k) = [| Key k |]
#else
    lift k = [| fromString k' |] where k' = toString k
#endif

#if MIN_VERSION_template_haskell(2,17,0)
    liftTyped = TH.unsafeCodeCoerce . TH.lift
#elif MIN_VERSION_template_haskell(2,16,0)
    liftTyped :: Key -> Q (TExp Key)
liftTyped = Q Exp -> Q (TExp Key)
forall a. Q Exp -> Q (TExp a)
TH.unsafeTExpCoerce (Q Exp -> Q (TExp Key)) -> (Key -> Q Exp) -> Key -> Q (TExp Key)
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Key -> Q Exp
forall t. Lift t => t -> Q Exp
TH.lift
#endif