| Copyright | (c) 2020 Composewell Technologies and Contributors |
|---|---|
| License | Apache-2.0 |
| Maintainer | streamly@composewell.com |
| Stability | experimental |
| Safe Haskell | None |
| Language | Haskell2010 |
Unicode.Char.Numeric
Description
Numeric character property related functions.
Since: 0.3.0
Synopsis
- isNumeric :: Char -> Bool
- isNumber :: Char -> Bool
- numericValue :: Char -> Maybe Rational
- integerValue :: Char -> Maybe Int
- isDigit :: Char -> Bool
- isOctDigit :: Char -> Bool
- isHexDigit :: Char -> Bool
- digitToInt :: Char -> Int
- intToDigit :: Int -> Char
Predicates
isNumeric :: Char -> Bool Source #
Selects Unicode character with a numeric value.
Note: a character may have a numeric value but return False with
the predicate isNumber, because
isNumber only tests
GeneralCategory: some CJK characters are
OtherLetter and do have a numeric value.
isNumeric c == isJust (numericValue c)
Since: 0.3.1
isNumber :: Char -> Bool Source #
Deprecated: Use Unicode.Char.Numeric.Compat.isNumber instead. This function will be a synonym for isNumeric in a future release. See Unicode.Char.Numeric.Compat for behavior compatible with base:Data.Char.
Selects Unicode numeric characters, including digits from various scripts, Roman numerals, et cetera.
This function returns True if its argument has one of the
following GeneralCategorys, or False otherwise:
Note: a character may have a numeric value (see numericValue) but return
False, because isNumber only tests GeneralCategory:
some CJK characters are OtherLetter and do have a
numeric value. Use isNumeric to cover those cases as well.
isNumber c == Data.Char.isNumber c
Since: 0.3.0
Numeric values
numericValue :: Char -> Maybe Rational Source #
Numeric value of a character, if relevant.
Note: a character may have a numeric value but return False with
the predicate isNumber, because
isNumber only tests
GeneralCategory: some CJK characters are
OtherLetter and do have a numeric value.
Since: 0.3.1
integerValue :: Char -> Maybe Int Source #
Integer value of a character, if relevant.
This is a special case of numericValue.
Note: a character may have a numeric value but return False with
the predicate isNumber, because
isNumber only tests
GeneralCategory: some CJK characters are
OtherLetter and do have a numeric value.
Since: 0.3.1
Re-export from base
isOctDigit :: Char -> Bool #
isHexDigit :: Char -> Bool #
digitToInt :: Char -> Int #
intToDigit :: Int -> Char #