mirror/emacs
1
0
Fork 0
mirror of https://git.savannah.gnu.org/git/emacs.git synced 2024-12-11 09:20:51 +00:00
Code Issues Releases Activity

(Splitting Characters, Translation of Characters): Don't mention generic

Browse Source 
characters.
This commit is contained in:
Eli Zaretskii 2008-10-14 12:47:06 +00:00
parent d15c8cce41
commit 02e99324a2
1 changed files with 1 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
doc/lispref/nonascii.texi
View File

@ -434,6 +434,7 @@ returns a list consisting of the symbol @code{unknown} and @var{character}.
@end example
@end defun
@c FIXME: update split-char and make-char
@cindex generate characters in charsets
@defun make-char charset &optional code1 code2
This function returns the character in character set @var{charset} whose
@ -453,32 +454,6 @@ instance, an ISO 8859 character code rather than subtracting 128, as
is necessary to index the corresponding Emacs charset.
@end defun
@cindex generic characters
If you call @code{make-char} with no @var{byte-values}, the result is
a @dfn{generic character} which stands for @var{charset}. A generic
character is an integer, but it is @emph{not} valid for insertion in the
buffer as a character. It can be used in @code{char-table-range} to
refer to the whole character set (@pxref{Char-Tables}).
@code{char-valid-p} returns @code{nil} for generic characters.
For example:
@example
(make-char 'latin-iso8859-1)
@result{} 2176
(char-valid-p 2176)
@result{} nil
(char-valid-p 2176 t)
@result{} t
(split-char 2176)
@result{} (latin-iso8859-1 0)
@end example
The character sets @code{ascii}, @code{eight-bit-control}, and
@code{eight-bit-graphic} don't have corresponding generic characters. If
@var{charset} is one of them and you don't supply @var{code1},
@code{make-char} returns the character code corresponding to the
smallest code in @var{charset}.
@node Scanning Charsets
@section Scanning for Character Sets
@ -541,17 +516,6 @@ The arguments and the forms in each argument are processed in order,
and if a previous form already translates @var{to} to some other
character, say @var{to-alt}, @var{from} is also translated to
@var{to-alt}.
You can also map one whole character set into another character set with
the same dimension. To do this, you specify a generic character (which
designates a character set) for @var{from} (@pxref{Splitting Characters}).
In this case, if @var{to} is also a generic character, its character
set should have the same dimension as @var{from}'s. Then the
translation table translates each character of @var{from}'s character
set into the corresponding character of @var{to}'s character set. If
@var{from} is a generic character and @var{to} is an ordinary
character, then the translation table translates every character of
@var{from}'s character set into @var{to}.
@end defun
In decoding, the translation table's translations are applied to the