{-# LANGUAGE CPP #-}
module Data.Ascii.Word8 where
import Data.Word (Word8)
import qualified Data.Char as C
fromChar :: Char -> Maybe Word8
fromChar c = if i < 128 then Just (fromIntegral i) else Nothing
where i = C.ord c
toChar :: Word8 -> Char
toChar = C.chr . fromIntegral
ascii :: Char -> Word8
ascii = fromIntegral . C.ord
{-# INLINE ascii #-}
isAscii :: Word8 -> Bool
isAscii = (< 128)
isControl :: Word8 -> Bool
isControl w = w < 32 || w == 127
isPrintable :: Word8 -> Bool
isPrintable w = w >= 32 && w < 127
isWhiteSpace :: Word8 -> Bool
isWhiteSpace w = w == ascii ' ' || w >= 9 && w <= 13
isSpaceOrTab :: Word8 -> Bool
isSpaceOrTab w = w == ascii ' ' || w == ascii '\t'
isLower :: Word8 -> Bool
isLower w = w >= ascii 'a' && w <= ascii 'z'
isUpper :: Word8 -> Bool
isUpper w = w >= ascii 'A' && w <= ascii 'Z'
toLower :: Word8 -> Word8
toLower w | isUpper w = w + 32
| otherwise = w
toUpper :: Word8 -> Word8
toUpper w | isLower w = w - 32
| otherwise = w
isAlpha :: Word8 -> Bool
isAlpha w = isUpper w || isLower w
isDigit :: Word8 -> Bool
isDigit w = w >= ascii '0' && w <= ascii '9'
isAlphaNum :: Word8 -> Bool
isAlphaNum w = isDigit w || isAlpha w
fromDigit :: Num a => Word8 -> Maybe a
fromDigit w | isDigit w = Just $ unsafeFromDigit w
| otherwise = Nothing
#if __GLASGOW_HASKELL__ >= 700
{-# INLINABLE fromDigit #-}
#endif
unsafeFromDigit :: Num a => Word8 -> a
unsafeFromDigit w = fromIntegral (w - ascii '0')
{-# INLINE unsafeFromDigit #-}
isOctDigit :: Word8 -> Bool
isOctDigit w = w >= ascii '0' && w <= ascii '7'
fromOctDigit :: Num a => Word8 -> Maybe a
fromOctDigit w | isOctDigit w = Just $ unsafeFromOctDigit w
| otherwise = Nothing
#if __GLASGOW_HASKELL__ >= 700
{-# INLINABLE fromOctDigit #-}
#endif
unsafeFromOctDigit :: Num a => Word8 -> a
unsafeFromOctDigit = unsafeFromDigit
{-# INLINE unsafeFromOctDigit #-}
isLowAF :: Word8 -> Bool
isLowAF w = w >= ascii 'a' && w <= ascii 'f'
{-# INLINE isLowAF #-}
fromLowAF :: Num a => Word8 -> a
fromLowAF w = fromIntegral (w - ascii 'a' + 10)
{-# INLINE fromLowAF #-}
isLowHexDigit :: Word8 -> Bool
isLowHexDigit w = isDigit w || isLowAF w
fromLowHexDigit :: Num a => Word8 -> Maybe a
fromLowHexDigit w | isDigit w = Just $ unsafeFromDigit w
| isLowAF w = Just $ fromLowAF w
| otherwise = Nothing
#if __GLASGOW_HASKELL__ >= 700
{-# INLINABLE fromLowHexDigit #-}
#endif
unsafeFromLowHexDigit :: Num a => Word8 -> a
unsafeFromLowHexDigit w | w < ascii 'a' = unsafeFromDigit w
| otherwise = fromLowAF w
{-# INLINE unsafeFromLowHexDigit #-}
isUpAF :: Word8 -> Bool
isUpAF w = w >= ascii 'A' && w <= ascii 'F'
{-# INLINE isUpAF #-}
fromUpAF :: Num a => Word8 -> a
fromUpAF w = fromIntegral (w - ascii 'A' + 10)
{-# INLINE fromUpAF #-}
isUpHexDigit :: Word8 -> Bool
isUpHexDigit w = isDigit w || isUpAF w
fromUpHexDigit :: Num a => Word8 -> Maybe a
fromUpHexDigit w | isDigit w = Just $ unsafeFromDigit w
| isUpAF w = Just $ fromUpAF w
| otherwise = Nothing
#if __GLASGOW_HASKELL__ >= 700
{-# INLINABLE fromUpHexDigit #-}
#endif
unsafeFromUpHexDigit :: Num a => Word8 -> a
unsafeFromUpHexDigit w | w < ascii 'A' = unsafeFromDigit w
| otherwise = fromUpAF w
{-# INLINE unsafeFromUpHexDigit #-}
isHexDigit :: Word8 -> Bool
isHexDigit w = isDigit w || isUpAF w || isLowAF w
fromHexDigit :: Num a => Word8 -> Maybe a
fromHexDigit w | isDigit w = Just $ unsafeFromDigit w
| isUpAF w = Just $ fromUpAF w
| isLowAF w = Just $ fromLowAF w
| otherwise = Nothing
#if __GLASGOW_HASKELL__ >= 700
{-# INLINABLE fromHexDigit #-}
#endif
unsafeFromHexDigit :: Num a => Word8 -> a
unsafeFromHexDigit w | w < ascii 'A' = unsafeFromDigit w
| w < ascii 'a' = fromUpAF w
| otherwise = fromLowAF w
{-# INLINE unsafeFromHexDigit #-}