bug#16800: 24.3; flyspell works slow on very short words at the end of big file

[Aleksey Cherepanov <aleksey.4erepanov@gmail.com>]

On Sat, Feb 22, 2014 at 10:55:11PM +0400, Aleksey Cherepanov wrote:
> On Sat, Feb 22, 2014 at 06:41:08PM +0200, Eli Zaretskii wrote:
> > > Date: Sat, 22 Feb 2014 20:02:17 +0400
> > > From: Aleksey Cherepanov <aleksey.4erepanov@gmail.com>
> > > Cc: agustin.martin@hispalinux.es, 16800@debbugs.gnu.org
> > > 
> > > > Your setup _might_ work the same, especially if you don't mix
> > > > different languages in the same buffer.  But in general, your change
> > > > does affect behavior.
> > > 
> > > I mix languages. I am pretty sure that my setup works the same.
> > 
> > Not in general, it isn't.  See below.
> 
> I agree.
> 
> Oh, not even for my setup. But for my setup together with my files.
> I've got an example.
> 
> > > BTW solution around reduction of jump points does not not affect
> > > faces: "nd" or "badnd" at the end of "good badnd good " does not call
> > > spell check on the first "badnd".
> > 
> > Not sure I understand what you are saying here.  What "first badnd"?
> > you have only one in this example.
> 
> "nd" does not cause spell check of "badnd". Another "badnd" at the end
> does not cause spell check of the first "badnd".
> 
> > > Emacs words are language sensitive too.
> > 
> > But not in the same way as ispell/flyspell is.  The CASECHARS,
> > NON-CASECHARS, and OTHERCHARS parameters of the dictionary are only
> > taken into account by ispell/flyspell.
> 
> I think one could define a dictionary like: ("my" "[a]" "[^a]" "" ...)
> So the only letter for flyspell words is "a". That way "qqaaqqaaqq" is
> one word for emacs and two words with garbage around for flyspell. I
> think my solution fails in such case.
> 
> So flyspell's set should be consisted of full emacs categories to make
> my solution work. Code for emacs word boundaries is in category.h,
> macro WORD_BOUNDARY_P. We could use regular search for bad setups and
> word search for good setups. Though it does not seem trivial to check
> if flyspell's dictionary setup is good for my solution.
> 
> Russian alphabet is not a full emacs (Unicode, I guess) category. The
> full category is Cyrillic script (or even wider). My solution does not
> work if there is a letter from the complement (for instance, Lje
> 02131) right near my mis-spelling word. So I was wrong about the
> behaviour: it is not the same, I just do not see differences in my
> files.

Oh, my setup is wrong. Default setup uses
"[[:alpha:]]"  ; casechars
"[^[:alpha:]]" ; not-casechars
due to ispell-set-spellchecker-params function:
    ;; If Emacs flavor supports [:alpha:] use it for global dicts.  If
    ;; spellchecker also supports UTF-8 via command-line option use it
    ;; in communication.  This does not affect definitions in your
    ;; init file.

My solution should work well with such setup.

Thanks!

-- 
Regards,
Aleksey Cherepanov