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module Data.Char
( isAscii, isLatin1, isAsciiUpper, isAsciiLower, isControl
, isUpper, isLower, isAlpha, isDigit, isAlphaNum
, isBinDigit, isOctDigit, isHexDigit, isSpace
, toUpper, toLower, digitToInt, intToDigit
, ord, chr
) where
isAscii :: Char -> Bool
isAscii c = c < '\128'
isLatin1 :: Char -> Bool
isLatin1 c = c < '\255'
isAsciiLower :: Char -> Bool
isAsciiLower c = c >= 'a' && c <= 'z'
isAsciiUpper :: Char -> Bool
isAsciiUpper c = c >= 'A' && c <= 'Z'
isControl :: Char -> Bool
isControl c = c < ' ' || c >= '\DEL' && c <= '\159'
toUpper :: Char -> Char
toUpper c | isLower c = chr (ord c - ord 'a' + ord 'A')
| otherwise = c
toLower :: Char -> Char
toLower c | isUpper c = chr (ord c - ord 'A' + ord 'a')
| otherwise = c
digitToInt :: Char -> Int
digitToInt c
| isDigit c
= ord c - ord '0'
| ord c >= ord 'A' && ord c <= ord 'F'
= ord c - ord 'A' + 10
| ord c >= ord 'a' && ord c <= ord 'f'
= ord c - ord 'a' + 10
| otherwise
= error "Char.digitToInt: argument is not a digit"
intToDigit :: Int -> Char
intToDigit i
| i >= 0 && i <= 9 = chr (ord '0' + i)
| i >= 10 && i <= 15 = chr (ord 'A' + i - 10)
| otherwise = error "Char.intToDigit: argument not a digit value"
|