Character objects and api for them.
Character objects and API for them.
The m17n library represents a character by a character code (an integer). The minimum character code is 0. The maximum character code is defined by the macro MCHAR_MAX. It is assured that MCHAR_MAX is not smaller than 0x3FFFFF (22 bits).
Characters 0 to 0x10FFFF are equivalent to the Unicode characters of the same code values.
A character can have zero or more properties called character properties. A character property consists of a key and a value, where key is a symbol and value is anything that can be cast to (void *). 'The character property that belongs
to character C and whose key is K' may be shortened to 'the K
property of C'.
Maximum character code. The macro MCHAR_MAX gives the maximum character code.
Key for script. The symbol Mscript has the name 'script' and is used as the key of a character property. The value of such a property is a symbol representing the script to which the character belongs.
Each symbol that represents a script has one of the names listed in the Unicode Technical Report #24.
Key for character name. The symbol Mname has the name 'name' and is used as the key of a character property. The value of such a property is a C-string representing the name of the character.
Key for general category. The symbol Mcategory has the name 'category' and is used as the key of a character property. The value of such a property is a symbol representing the general category of the character.
Each symbol that represents a general category has one of the names listed as abbreviations for General Category in Unicode.
Key for canonical combining class. The symbol Mcombining_class has the name 'combining-class' and is used as the key of a character property. The value of such a property is an integer that represents the canonical combining class of the character.
The meaning of each integer that represents a canonical combining class is identical to the one defined in Unicode.
Key for bidi category. The symbol Mbidi_category has the name 'bidi-category' and is used as the key of a character property. The value of such a property is a symbol that represents the bidirectional category of the character.
Each symbol that represents a bidirectional category has one of the names listed as types of Bidirectional Category in Unicode.
Key for corresponding single lowercase character. The symbol Msimple_case_folding has the name 'simple-case-folding' and is used as the key of a character property. The value of such a property is the corresponding single lowercase character that is used when comparing M-texts ignoring cases.
If a character requires a complicated comparison (i.e. cannot be compared by simply mapping to another single character), the value of such a property is 0xFFFF. In this case, the character has another property whose key is Mcomplicated_case_folding.
Key for corresponding multiple lowercase characters. The symbol Mcomplicated_case_folding has the name 'complicated-case-folding' and is used as the key of a character property. The value of such a property is the corresponding M-text that contains a sequence of lowercase characters to be used for comparing M-texts ignoring case.
Key for values used in case operation. The symbol Mcased has the name 'cased' and is used as the key of charater property. The value of such a property is an integer value 1, 2, or 3 representing 'cased', 'case-ignorable', and both of them respective. See the Unicode Standard 5.0 (Section 3.13 Default Case Algorithm) for the detail.
Key for values used in case operation. The symbol Msoft_dotted has the name 'soft-dotted' and is used as the key of charater property. The value of such a property is Mt if a character has 'Soft_Dotted' property, and Mnil otherwise. See the Unicode Standard 5.0 (Section 3.13 Default Case Algorithm) for the detail.
Key for values used in case operation. The symbol Mcase_mapping has the name 'case-mapping' and is used as the key of charater property. The value of such a property is a plist of three M-Texts; lower, title, and upper of the corresponding character. See the Unicode Standard 5.0 (Section 5.18 Case Mappings) for the detail.
Key for script block name. The symbol Mblock the name 'block' and is used as the key of charater property. The value of such a property is a symbol representing a script block of the corresponding character.
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