Unicode.Char.General

Unicode General Categories.

These classes are defined in the Unicode Character Database, part of the Unicode standard

Note: the classes must be in the same order they are listed in the Unicode Standard, because some functions (e.g. generalCategory) rely on the Enum instance.

Abbreviation of GeneralCategory used in the Unicode standard.

The Unicode general category of the character.

This property is defined in the column 2 of the UnicodeData table.

This relies on the Enum instance of GeneralCategory, which must remain in the same order as the categories are presented in the Unicode standard.

prop> show (generalCategory c) == show (Data.Char.generalCategory c)

Returns True for alphabetic Unicode characters (lower-case, upper-case and title-case letters, plus letters of caseless scripts and modifiers letters).

Note: this function is not equivalent to isAlpha / isLetter:

• isAlpha matches the following general categories:

  • UppercaseLetter (Lu)

  • LowercaseLetter (Ll)

  • TitlecaseLetter (Lt)

  • ModifierLetter (Lm)

  • OtherLetter (Lo)

• whereas isAlphabetic matches:

  • Uppercase property

  • Lowercase property

  • TitlecaseLetter (Lt)

  • ModifierLetter (Lm)

  • OtherLetter (Lo)

  • LetterNumber (Nl)

  • Other_Alphabetic property

Selects alphabetic or numeric Unicode characters.

This function returns True if its argument has one of the following GeneralCategorys, or False otherwise:

• UppercaseLetter

• LowercaseLetter

• TitlecaseLetter

• ModifierLetter

• OtherLetter

• DecimalNumber

• LetterNumber

• OtherNumber

prop> isAlphaNum c == Data.Char.isAlphaNum c

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

This function returns True if its argument has the GeneralCategory Control.

prop> isControl c == Data.Char.isControl c

Selects Unicode mark characters, for example accents and the like, which combine with preceding characters.

This function returns True if its argument has one of the following GeneralCategorys, or False otherwise:

• NonSpacingMark

• SpacingCombiningMark

• EnclosingMark

prop> isMark c == Data.Char.isMark c

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

This function returns False if its argument has one of the following GeneralCategorys, or True otherwise:

• LineSeparator

• ParagraphSeparator

• Control

• Format

• Surrogate

• PrivateUse

• NotAssigned

prop> isPrint c == Data.Char.isPrint c

Selects Unicode punctuation characters, including various kinds of connectors, brackets and quotes.

This function returns True if its argument has one of the following GeneralCategorys, or False otherwise:

• ConnectorPunctuation

• DashPunctuation

• OpenPunctuation

• ClosePunctuation

• InitialQuote

• FinalQuote

• OtherPunctuation

prop> isPunctuation c == Data.Char.isPunctuation c

Selects Unicode space and separator characters.

This function returns True if its argument has one of the following GeneralCategorys, or False otherwise:

• Space

• LineSeparator

• ParagraphSeparator

prop> isSeparator c == Data.Char.isSeparator c

Selects Unicode symbol characters, including mathematical and currency symbols.

This function returns True if its argument has one of the following GeneralCategorys, or False otherwise: * MathSymbol * CurrencySymbol * ModifierSymbol * OtherSymbol

prop> isSymbol c == Data.Char.isSymbol c

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

See: Unicode White_Space.

Note: isWhiteSpace is not equivalent to isSpace. isWhiteSpace selects the same characters from isSpace plus the following:

• U+0085 NEXT LINE (NEL)

• U+2028 LINE SEPARATOR

• U+2029 PARAGRAPH SEPARATOR

Returns True for alphabetic Unicode characters (lower-case, upper-case and title-case letters, plus letters of caseless scripts and modifiers letters).

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