haskell98-2.0.0.1: Compatibility with Haskell 98

Safe HaskellSafe

Char

Synopsis

Documentation

isAscii :: Char -> BoolSource

Selects the first 128 characters of the Unicode character set, corresponding to the ASCII character set.

isLatin1 :: Char -> BoolSource

Selects the first 256 characters of the Unicode character set, corresponding to the ISO 8859-1 (Latin-1) character set.

isControl :: Char -> BoolSource

Selects control characters, which are the non-printing characters of the Latin-1 subset of Unicode.

isPrint :: Char -> BoolSource

Selects printable Unicode characters (letters, numbers, marks, punctuation, symbols and spaces).

isSpace :: Char -> BoolSource

Returns True for any Unicode space character, and the control characters \t, \n, \r, \f, \v.

isUpper :: Char -> BoolSource

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 -> BoolSource

Selects lower-case alphabetic Unicode characters (letters).

isAlpha :: Char -> BoolSource

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.

isDigit :: Char -> BoolSource

Selects ASCII digits, i.e. '0'..'9'.

isOctDigit :: Char -> BoolSource

Selects ASCII octal digits, i.e. '0'..'7'.

isHexDigit :: Char -> BoolSource

Selects ASCII hexadecimal digits, i.e. '0'..'9', 'a'..'f', 'A'..'F'.

isAlphaNum :: Char -> BoolSource

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 -> IntSource

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 -> CharSource

Convert an Int in the range 0..15 to the corresponding single digit Char. This function fails on other inputs, and generates lower-case hexadecimal digits.

toUpper :: Char -> CharSource

Convert a letter to the corresponding upper-case letter, if any. Any other character is returned unchanged.

toLower :: Char -> CharSource

Convert a letter to the corresponding lower-case letter, if any. Any other character is returned unchanged.

ord :: Char -> IntSource

The fromEnum method restricted to the type Char.

chr :: Int -> CharSource

The toEnum method restricted to the type Char.

readLitChar :: ReadS CharSource

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 -> ShowSSource

Convert a character to a string using only printable characters, using Haskell source-language escape conventions. For example:

 showLitChar '\n' s  =  "\\n" ++ s

lexLitChar :: ReadS StringSource

Read a string representation of a character, using Haskell source-language escape conventions. For example:

 lexLitChar  "\\nHello"  =  [("\\n", "Hello")]

type String = [Char]Source

A String is a list of characters. String constants in Haskell are values of type String.