Character classes -- what about them -- need to support them?
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Hi,
While looking at upgrading some packages, specifically getting
go(lang)-mode to work with XEmacs, I have come across the character
classes like [[:space:]] [[:word:]] etc.
We have this issue in the tracker:
http://tracker.xemacs.org/XEmacs/its/issue302
What would it take to support these classes to get compatible with GNU
Emacs? Major C-code change or what?
It seems that many packages use these so it would make porting and
syncing much easier. Especially since this things only show up in
runtime.
What also confuses me is that it seems we have support for them in
regexps but not in functions like re-search-forward!? What is the
story here?
Yours
--
%% Mats
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XEmacs-Beta(a)xemacs.org
http://lists.xemacs.org/mailman/listinfo/xemacs-beta
Am 15.04.2012 10:33, schrieb Mats Lidell:
Hi,
While looking at upgrading some packages, specifically getting
go(lang)-mode to work with XEmacs, I have come across the character
classes like [[:space:]] [[:word:]] etc.
We have this issue in the tracker:
http://tracker.xemacs.org/XEmacs/its/issue302
What would it take to support these classes to get compatible with GNU
Emacs? Major C-code change or what?
It seems that many packages use these so it would make porting and
syncing much easier. Especially since this things only show up in
runtime.
What also confuses me is that it seems we have support for them in
regexps but not in functions like re-search-forward!? What is the
story here?
Yours
it enhances legibility
tried a workaround at
http://launchpad.net/s-x-emacs-werkstatt
thingatpt-utils-base.el
starts at line 281
like that
(when (featurep 'xemacs)
(defcustom ascii "[\000-\177]"
"Rexexp to specify the character class
Change it, if you want to pick strings differently.
XEmacs-users: `unibyte' and `multibyte' class is unused i.e. set to
\".\""
:type 'regexp
:group 'convenience))
Best,
Andreas
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On Sun, Apr 15, 2012 at 5:33 PM, Mats Lidell <matsl(a)xemacs.org> wrote:
What would it take to support [POSIX regexp character] classes to
get
compatible with GNU Emacs? Major C-code change or what?
To get compatibility shouldn't be too hard. We already need to parse []
and interpret classes, and the POSIX abbreviations like [:ascii:] only work
there. But the regexp parser code is non-trivial, I don't really know how
hard it would actually be for someone who isn't already quite familiar with
it.
Making it efficient might take a bit more work.
What also confuses me is that it seems we have support for them in
regexps but not in functions like re-search-forward!?
What do you mean by "support in regexps but not in re-search-forward"?
AFAIK we have no support for them at all, certainly not at the C level.
There might be some Lisp libraries that will translate (some of) those
classes to character classes understood by our regexp engine.
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Andreas Röhler -
Stephen J. Turnbull -
The XEmacs Package Smoketest