| Safe Haskell | Safe |
|---|---|
| Language | Haskell98 |
Char
- isAscii :: Char -> Bool
- isLatin1 :: Char -> Bool
- isControl :: 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
- digitToInt :: Char -> Int
- intToDigit :: Int -> Char
- toUpper :: Char -> Char
- toLower :: Char -> Char
- ord :: Char -> Int
- chr :: Int -> Char
- readLitChar :: ReadS Char
- showLitChar :: Char -> ShowS
- lexLitChar :: ReadS String
- data Char :: *
- type String = [Char]
Documentation
Selects the first 128 characters of the Unicode character set, corresponding to the ASCII character set.
Selects the first 256 characters of the Unicode character set, corresponding to the ISO 8859-1 (Latin-1) character set.
Selects control characters, which are the non-printing characters of the Latin-1 subset of Unicode.
Selects printable Unicode characters (letters, numbers, marks, punctuation, symbols and spaces).
Returns True for any Unicode space character, and the control
characters \t, \n, \r, \f, \v.
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.
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 isLetter.
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.
digitToInt :: Char -> Int
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').
intToDigit :: Int -> Char
Convert a letter to the corresponding upper-case letter, if any. Any other character is returned unchanged.
Convert a letter to the corresponding lower-case letter, if any. Any other character is returned unchanged.
readLitChar :: ReadS Char
Read a string representation of a character, using Haskell source-language escape conventions, and convert it to the character that it encodes. For example:
readLitChar "\\nHello" = [('\n', "Hello")]showLitChar :: Char -> ShowS
Convert a character to a string using only printable characters, using Haskell source-language escape conventions. For example:
showLitChar '\n' s = "\\n" ++ s
Read a string representation of a character, using Haskell source-language escape conventions. For example:
lexLitChar "\\nHello" = [("\\n", "Hello")]data Char :: *
The character type Char is an enumeration whose values represent
Unicode (or equivalently ISO/IEC 10646) characters (see
http://www.unicode.org/ for details). This set extends the ISO 8859-1
(Latin-1) character set (the first 256 characters), which is itself an extension
of the ASCII character set (the first 128 characters). A character literal in
Haskell has type Char.
To convert a Char to or from the corresponding Int value defined
by Unicode, use toEnum and fromEnum from the
Enum class respectively (or equivalently ord and chr).