module Data.Ascii
(
Ascii
, CIAscii
, fromByteString
, fromChars
, fromText
, unsafeFromByteString
, unsafeFromString
, unsafeFromText
, toByteString
, toString
, toText
, toCIAscii
, fromCIAscii
, ciToByteString
) where
import Data.ByteString (ByteString)
import qualified Data.ByteString as S
import qualified Data.ByteString.Char8 as S8
import Data.Char (toLower, isAscii)
import Data.String (IsString (..))
import Data.Data (Data)
import Data.Typeable (Typeable)
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)
data CIAscii = CIAscii
{ ciOriginal :: !ByteString
, ciLowerCase :: !ByteString
}
deriving (Data, Typeable)
instance Show CIAscii where
show = show . ciOriginal
instance Read CIAscii where
readsPrec i = map (\(x, y) -> (toCIAscii x, y)) . readsPrec i
instance Eq CIAscii where
x == y = ciLowerCase x == ciLowerCase y
instance Ord CIAscii where
x <= y = ciLowerCase x <= ciLowerCase y
instance IsString CIAscii where
fromString = toCIAscii . unsafeFromString
fromByteString :: ByteString -> Maybe Ascii
fromByteString bs
| S.all (< 128) bs = Just $ Ascii bs
| otherwise = Nothing
fromChars :: String -> Maybe Ascii
fromChars s
| all isAscii s = Just $ Ascii $ S8.pack s
| otherwise = Nothing
fromText :: Text -> Maybe Ascii
fromText t
| T.all 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 (Ascii bs) = CIAscii bs $ S8.map toLower bs
fromCIAscii :: CIAscii -> Ascii
fromCIAscii = Ascii . ciOriginal
toByteString :: Ascii -> ByteString
toByteString (Ascii bs) = bs
toString :: Ascii -> String
toString (Ascii bs) = S8.unpack bs
toText :: Ascii -> Text
toText (Ascii bs) = TE.decodeASCII bs
ciToByteString :: CIAscii -> ByteString
ciToByteString = ciOriginal