{-# LANGUAGE DeriveDataTypeable, GeneralizedNewtypeDeriving #-}
module Data.Ascii.ByteString where
import Data.Data (Data)
import Data.Typeable (Typeable)
import Data.String (IsString (..))
import qualified Data.Char as C
import Data.Semigroup (Semigroup)
import qualified Data.ByteString as S
import qualified Data.ByteString.Char8 as S8
import Data.ByteString (ByteString)
import Data.CaseInsensitive (FoldCase, CI, mk, original)
import Data.Hashable (Hashable)
import Data.Text (Text)
import qualified Data.Text as T
import qualified Data.Text.Encoding as TE
newtype Ascii = Ascii ByteString
deriving (Show, Eq, Read, Ord, Data, Typeable, IsString, FoldCase, Hashable, Semigroup, Monoid)
type CIAscii = CI Ascii
fromByteString :: ByteString -> Maybe Ascii
fromByteString bs
| S.all (< 128) bs = Just $ Ascii bs
| otherwise = Nothing
fromChars :: String -> Maybe Ascii
fromChars s
| all C.isAscii s = Just $ Ascii $ S8.pack s
| otherwise = Nothing
fromText :: Text -> Maybe Ascii
fromText t
| T.all C.isAscii t = Just $ Ascii $ TE.encodeUtf8 t
| otherwise = Nothing
unsafeFromByteString :: ByteString -> Ascii
unsafeFromByteString = Ascii
unsafeFromString :: String -> Ascii
unsafeFromString = Ascii . S8.pack
unsafeFromText :: Text -> Ascii
unsafeFromText = Ascii . TE.encodeUtf8
toCIAscii :: Ascii -> CIAscii
toCIAscii = mk
fromCIAscii :: CIAscii -> Ascii
fromCIAscii = original
toByteString :: Ascii -> ByteString
toByteString (Ascii bs) = bs
toString :: Ascii -> String
toString (Ascii bs) = S8.unpack bs
toText :: Ascii -> Text
toText (Ascii bs) = TE.decodeUtf8 bs
ciToByteString :: CIAscii -> ByteString
ciToByteString = toByteString . original