table of contents
Charset(3m17n) | The m17n Library | Charset(3m17n) |
NAME¶
Charset - Charset objects and API for them.Defines¶
#define MCHAR_INVALID_CODE
Functions¶
MSymbol mchar_define_charset (const char *name, MPlist *plist)
Variables¶
MSymbol Mcharset
Variables: Symbols representing a charset.¶
Each of the following symbols represents a predefined charset.
MSymbol Mcharset_ascii
Variables: Parameter keys for mchar_define_charset().¶
These are the predefined symbols to use as parameter keys for the function mchar_define_charset() (which see).
MSymbol Mmethod
Variables: Symbols representing charset methods.¶
These are the predefined symbols that can be a value of the Mmethod parameter of a charset used in an argument to the mchar_define_charset() function. A method specifies how code-points and character codes are converted. See the documentation of the mchar_define_charset() function for the details.
MSymbol Moffset
Detailed Description¶
Charset objects and API for them.- •
- A code-point is a number assigned by the CCS to each character. Code-points may or may not be continuous. The type unsigned is used to represent a code-point. An invalid code-point is represented by the macro MCHAR_INVALID_CODE.
- •
- A character index is the canonical index of a character in a CCS. The character that has the character index N occupies the Nth position when all the characters in the current CCS are sorted by their code-points. Character indices in a CCS are continuous and start with 0.
- •
- A character code is the internal representation in the m17n library of a character. A character code is a signed integer of 21 bits or longer.
Define Documentation¶
#define MCHAR_INVALID_CODE¶
Invalid code-point. The macro MCHAR_INVALID_CODE gives the invalid code-point.Variable Documentation¶
MSymbol Mcharset_ascii¶
Symbol representing the charset ASCII. The symbol Mcharset_ascii has name 'ascii' and represents the charset ISO 646, USA Version X3.4-1968 (ISO-IR-6).MSymbol Mcharset_iso_8859_1¶
Symbol representing the charset ISO/IEC 8859/1. The symbol Mcharset_iso_8859_1 has name 'iso-8859-1' and represents the charset ISO/IEC 8859-1:1998.MSymbol Mcharset_unicode¶
Symbol representing the charset Unicode. The symbol Mcharset_unicode has name 'unicode' and represents the charset Unicode.MSymbol Mcharset_m17n¶
Symbol representing the largest charset. The symbol Mcharset_m17n has name 'm17n' and represents the charset that contains all characters supported by the m17n library.MSymbol Mcharset_binary¶
Symbol representing the charset for ill-decoded characters. The symbol Mcharset_binary has name 'binary' and represents the fake charset which the decoding functions put to an M-text as a text property when they encounter an invalid byte (sequence). See Code Conversion for more details.MSymbol Mmethod¶
MSymbol Mdimension¶
MSymbol Mmin_range¶
MSymbol Mmax_range¶
MSymbol Mmin_code¶
MSymbol Mmax_code¶
MSymbol Mascii_compatible¶
MSymbol Mfinal_byte¶
MSymbol Mrevision¶
MSymbol Mmin_char¶
MSymbol Mmapfile¶
MSymbol Mparents¶
MSymbol Msubset_offset¶
MSymbol Mdefine_coding¶
MSymbol Maliases¶
MSymbol Moffset¶
Symbol for the offset type method of charset. The symbol Moffset has the name 'offset' and, when used as a value of Mmethod parameter of a charset, it means that the conversion of code-points and character codes of the charset is done by this calculation:CHARACTER-CODE = CODE-POINT - MIN-CODE + MIN-CHARwhere, MIN-CODE is a value of Mmin_code parameter of the charset, and MIN-CHAR is a value of Mmin_char parameter.
MSymbol Mmap¶
Symbol for the map type method of charset. The symbol Mmap has the name 'map' and, when used as a value of Mmethod parameter of a charset, it means that the conversion of code-points and character codes of the charset is done by map looking up. The map must be given by Mmapfile parameter.MSymbol Munify¶
Symbol for the unify type method of charset. The symbol Munify has the name 'unify' and, when used as a value of Mmethod parameter of a charset, it means that the conversion of code-points and character codes of the charset is done by map looking up and offsetting. The map must be given by Mmapfile parameter. For this kind of charset, a unique continuous character code space for all characters is assigned. If the map has an entry for a code-point, the conversion is done by looking up the map. Otherwise, the conversion is done by this calculation:CHARACTER-CODE = CODE-POINT - MIN-CODE + LOWEST-CHAR-CODEwhere, MIN-CODE is a value of Mmin_code parameter of the charset, and LOWEST-CHAR-CODE is the lowest character code of the assigned code space.
MSymbol Msubset¶
Symbol for the subset type method of charset. The symbol Msubset has the name 'subset' and, when used as a value of Mmethod parameter of a charset, it means that the charset is a subset of a parent charset. The parent charset must be given by Mparents parameter. The conversion of code-points and character codes of the charset is done conceptually by this calculation:CHARACTER-CODE = PARENT-CODE (CODE-POINT) + SUBSET-OFFSETwhere, PARENT-CODE is a pseudo function that returns a character code of CODE-POINT in the parent charset, and SUBSET-OFFSET is a value given by Msubset_offset parameter.
MSymbol Msuperset¶
Symbol for the superset type method of charset. The symbol Msuperset has the name 'superset' and, when used as a value of Mmethod parameter of a charset, it means that the charset is a superset of parent charsets. The parent charsets must be given by Mparents parameter.MSymbol Mcharset¶
The symbol Mcharset. Any decoded M-text has a text property whose key is the predefined symbol Mcharset. The name of Mcharset is 'charset'.Author¶
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