base-3.0.2.0: Basic librariesContentsIndex
GHC.Unicode
Portabilitynon-portable (GHC extensions)
Stabilityinternal
Maintainercvs-ghc@haskell.org
Description
Implementations for the character predicates (isLower, isUpper, etc.) and the conversions (toUpper, toLower). The implementation uses libunicode on Unix systems if that is available.
Synopsis
isAscii :: Char -> Bool
isLatin1 :: Char -> Bool
isControl :: Char -> Bool
isAsciiUpper :: Char -> Bool
isAsciiLower :: Char -> Bool
isPrint :: Char -> Bool
isSpace :: Char -> Bool
isUpper :: Char -> Bool
isLower :: Char -> Bool
isAlpha :: Char -> Bool
isDigit :: Char -> Bool
isOctDigit :: Char -> Bool
isHexDigit :: Char -> Bool
isAlphaNum :: Char -> Bool
toUpper :: Char -> Char
toLower :: Char -> Char
toTitle :: Char -> Char
wgencat :: CInt -> CInt
Documentation
isAscii :: Char -> Bool
Selects the first 128 characters of the Unicode character set, corresponding to the ASCII character set.
isLatin1 :: Char -> Bool
Selects the first 256 characters of the Unicode character set, corresponding to the ISO 8859-1 (Latin-1) character set.
isControl :: Char -> Bool
Selects control characters, which are the non-printing characters of the Latin-1 subset of Unicode.
isAsciiUpper :: Char -> Bool
Selects ASCII upper-case letters, i.e. characters satisfying both isAscii and isUpper.
isAsciiLower :: Char -> Bool
Selects ASCII lower-case letters, i.e. characters satisfying both isAscii and isLower.
isPrint :: Char -> Bool
Selects printable Unicode characters (letters, numbers, marks, punctuation, symbols and spaces).
isSpace :: Char -> Bool
Selects white-space characters in the Latin-1 range. (In Unicode terms, this includes spaces and some control characters.)
isUpper :: Char -> Bool
Selects upper-case or title-case alphabetic Unicode characters (letters). Title case is used by a small number of letter ligatures like the single-character form of Lj.
isLower :: Char -> Bool
Selects lower-case alphabetic Unicode characters (letters).
isAlpha :: Char -> Bool
Selects alphabetic Unicode characters (lower-case, upper-case and title-case letters, plus letters of caseless scripts and modifiers letters). This function is equivalent to Data.Char.isLetter.
isDigit :: Char -> Bool
Selects ASCII digits, i.e. '0'..'9'.
isOctDigit :: Char -> Bool
Selects ASCII octal digits, i.e. '0'..'7'.
isHexDigit :: Char -> Bool
Selects ASCII hexadecimal digits, i.e. '0'..'9', 'a'..'f', 'A'..'F'.
isAlphaNum :: Char -> Bool

Selects alphabetic or numeric digit Unicode characters.

Note that numeric digits outside the ASCII range are selected by this function but not by isDigit. Such digits may be part of identifiers but are not used by the printer and reader to represent numbers.

toUpper :: Char -> Char
Convert a letter to the corresponding upper-case letter, if any. Any other character is returned unchanged.
toLower :: Char -> Char
Convert a letter to the corresponding lower-case letter, if any. Any other character is returned unchanged.
toTitle :: Char -> Char
Convert a letter to the corresponding title-case or upper-case letter, if any. (Title case differs from upper case only for a small number of ligature letters.) Any other character is returned unchanged.
wgencat :: CInt -> CInt
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