Library: Unicode (OMUNICODE) Import: omunicode.xmd

Return type: String Returns: The two-letter general category value of the argument character.

Declaration

export string function
   general-category of value integer character
    

Use general-category to find the Unicode general category property of a character code point, as defined in Unicode 5.1.0. The following general category values can be returned by this function:

• Lu : Letter, Uppercase
• Ll : Letter, Lowercase
• Lt : Letter, Titlecase
• Lm : Letter, Modifier
• Lo : Letter, Other
• Mn : Mark, Nonspacing
• Mc : Mark, Spacing Combining
• Me : Mark, Enclosing
• Nd : Number, Decimal Digit
• Nl : Number, Letter
• No : Number, Other
• Pc : Punctuation, Connector
• Pd : Punctuation, Dash
• Ps : Punctuation, Open
• Pe : Punctuation, Close
• Pi : Punctuation, Initial quote (may behave like Ps or Pe depending on usage)
• Pf : Punctuation, Final quote (may behave like Ps or Pe depending on usage)
• Po : Punctuation, Other
• Sm : Symbol, Math
• Sc : Symbol, Currency
• Sk : Symbol, Modifier
• So : Symbol, Other
• Zs : Separator, Space
• Zl : Separator, Line
• Zp : Separator, Paragraph
• Cc : Other, Control
• Cf : Other, Format
• Cs : Other, Surrogate
• Co : Other, Private Use
• Cn : Other, Not Assigned

Example

The following pattern function matches a UTF-8 encoded white space character:

  import "omunicode.xmd" prefixed by unicode.
  import "omutf8.xmd" prefixed by utf8.
  
  define switch function
     unicode-whitespace
  as
     return #current-input matches (utf8.char => character
                                    (when unicode.general-category of utf8.code-point of character matches "Z"))

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