Unicode.Char.Case.Compat

Compatibility module for case and case mapping related functions.

The functions of this module are drop-in replacement for those in Data.Char. They are similar but not identical to some functions in Unicode.Char.Case, therefore they are placed in a separate module in order to avoid ambiguity.

Predicates

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.

It matches characters with general category UppercaseLetter and TitlecaseLetter.

See: isUpperCase for the full upper case predicate.

isUpper c == Data.Char.isUpper c

Since: 0.3.0

isLower :: Char -> Bool

Selects lower-case alphabetic Unicode characters (letters).

It matches characters with general category LowercaseLetter.

See: isLowerCase for the full lower case predicate.

isLower c == Data.Char.isLower c

Since: 0.3.0

Case conversion

toUpper :: Char -> Char

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

It uses the character property Simple_Uppercase_Mapping.

See: upperCaseMapping and toUpperString for full upper case conversion.

toUpper c == Data.Char.toUpper c

Since: 0.3.0

toLower :: Char -> Char

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

It uses the character property Simple_Lowercase_Mapping.

See: lowerCaseMapping and toLowerString for full lower case conversion.

toLower c == Data.Char.toLower c

Since: 0.3.0

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.

It uses the character property Simple_Titlecase_Mapping.

See: titleCaseMapping and toTitleString for full title case conversion.

toTitle c == Data.Char.toTitle c

Since: 0.3.0