{-# OPTIONS -fno-implicit-prelude #-} ----------------------------------------------------------------------------- -- | -- Module : Data.Char -- Copyright : (c) The University of Glasgow 2001 -- License : BSD-style (see the file libraries/base/LICENSE) -- -- Maintainer : libraries@haskell.org -- Stability : provisional -- Portability : portable -- -- The Char type and associated operations. -- ----------------------------------------------------------------------------- module Data.Char ( Char , String -- * Character classification -- | Unicode characters are divided into letters, numbers, marks, -- punctuation, symbols, separators (including spaces) and others -- (including control characters). -- The full set of Unicode character attributes is not accessible -- in this library. , isAscii, isLatin1, isControl, isSpace , isLower, isUpper, isAlpha, isAlphaNum, isPrint , isDigit, isOctDigit, isHexDigit -- :: Char -> Bool -- * Case conversion , toUpper, toLower -- :: Char -> Char -- * Single digit characters , digitToInt -- :: Char -> Int , intToDigit -- :: Int -> Char -- * Numeric representations , ord -- :: Char -> Int , chr -- :: Int -> Char -- * String representations , showLitChar -- :: Char -> ShowS , lexLitChar -- :: ReadS String , readLitChar -- :: ReadS Char , isAsciiUpper , isAsciiLower , isSymbol , isPunctuation -- Implementation checked wrt. Haskell 98 lib report, 1/99. ) where import Hugs.Char -- | Convert a single digit 'Char' to the corresponding 'Int'. -- This function fails unless its argument satisfies 'isHexDigit', -- but recognises both upper and lower-case hexadecimal digits -- (i.e. @\'0\'@..@\'9\'@, @\'a\'@..@\'f\'@, @\'A\'@..@\'F\'@). digitToInt :: Char -> Int digitToInt c | isDigit c = ord c - ord '0' | c >= 'a' && c <= 'f' = ord c - ord 'a' + 10 | c >= 'A' && c <= 'F' = ord c - ord 'A' + 10 | otherwise = error ("Char.digitToInt: not a digit " ++ show c) -- sigh isAsciiUpper :: Char -> Bool isAsciiUpper = undefined isAsciiLower :: Char -> Bool isAsciiLower = undefined isSymbol = undefined :: Char -> Bool isPunctuation = undefined :: Char -> Bool
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