In the Data.Char module, isDigit selects only the ASCII digits 0 through 9, and isNumber selects a wider set of characters because the full Unicode character set contains more numeric characters than just the ASCII digits. In this module, these two functions are redundant, but we include this synonym for compatibility with Data.Char.

Miscellaneous predicates

isSpace :: Char -> Bool Source #

Returns True for the following characters:

This function is analogous to isSpace in the Data.Char module.

isAlphaNum :: Char -> Bool Source #

This function is analogous to isAlphaNum in the Data.Char module.

isMark :: Char -> Bool Source #

Selects mark characters, for example accents and the like, which combine with preceding characters. This always returns False because ASCII does not include any mark characters. This function is included only for compatibility with isMark in the Data.Char module.

isPunctuation :: Char -> Bool Source #

Returns True for the following characters:

This function is analogous to isPunctuation in the Data.Char module.

isSymbol :: Char -> Bool Source #

Returns True for the following characters:

This function is analogous to isSymbol in the Data.Char module.

isSeparator :: Char -> Bool Source #

Returns True if the character is Space.

This function is analogous to isSeparator in the Data.Char module.

isVisible :: Char -> Bool Source #

Returns True for visible characters.

This includes all print characters except Space.

Notes

This module defines drop-in replacements for closely related definitions of the same name in the Data.Char module.

>>> import qualified Data.Char >>> import qualified Data.List >>> convert = Data.Char.chr . ASCII.Char.toInt >>> eq f g = Data.List.all (\x -> f x == g (convert x)) ASCII.Char.allCharacters

>>> eq isControl Data.Char.isControl True

>>> eq isSpace Data.Char.isSpace True

>>> eq isLower Data.Char.isLower True

>>> eq isUpper Data.Char.isUpper True

>>> eq isAlpha Data.Char.isAlpha True

>>> eq isAlphaNum Data.Char.isAlphaNum True

>>> eq isPrint Data.Char.isPrint True

>>> eq isDigit Data.Char.isDigit True

>>> eq isOctDigit Data.Char.isOctDigit True

>>> eq isHexDigit Data.Char.isHexDigit True

>>> eq isLetter Data.Char.isLetter True

>>> eq isMark Data.Char.isMark True

>>> eq isNumber Data.Char.isNumber True

>>> eq isPunctuation Data.Char.isPunctuation True

>>> eq isSymbol Data.Char.isSymbol True

>>> eq isSeparator Data.Char.isSeparator True