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Re: bug#1406: backward-up-list reports scan error incorrectly?


From: xah lee
Subject: Re: bug#1406: backward-up-list reports scan error incorrectly?
Date: Thu, 27 Nov 2008 07:56:17 -0800

On Nov 27, 4:19 am, Alan Mackenzie <address@hidden> wrote:
> Hi, Xah!
>
> > > though, isn't this something easy to fix?
> > No, because it isn't a bug. It's the way the function is meant to work. > > If there is a bug, it's that the doc-string (and maybe the elisp manual,
> > I haven't looked) is vague and incomplete.
>
> I've amended the Emacs manual (.../doc/emacs/programs.texi) and the doc
> strings of `backward-up-list' and several similar functions
> (.../lisp/emacs-lisp/lisp.el).
>
> If you're interested, have a look at the changes in
> <http://cvs.savannah.gnu.org/viewvc/emacs/?root=emacs>.

Thanks Alan.

I'd rather hope for a fix instead of change wording to reflect current situation.

You argued in bug list that the issue is not simple essentially due to the fact that straight quote chars are not matching pairs.

That is true, but i think given today's tech and computing power, we can over come this. Just assume that double quotes in the source code are matched, since they are most of the time. In the few cases when the backward-up-list went to the wrong place due to un-matched double quote, i think that's ok. (as opposed to, it stops dead and utter a beep.)

alternatively, if the cursor is inside double quote, then issue a warning in the messag area that the result may not be correct.

Also, since this works in text-mode, so apparently this can work. A implementation is to temporarily switch to that mode, do the cursor move, then switch back. Or temp set the syntax table to whatever chat that made text-mode work and emacs-lisp-mode not work.

In general, my feeling is that moving around nested pairs is not a some insurmountable issue, that given today's technology and software, it seems wimpy to tell users that backward-up-list won't work if it's inside double quotes. Much complex problems are solved today in emacs, in other IDEs, etc.

Just my opinions. Thanks.

  Xah
∑ http://xahlee.org/

☄



On Nov 27, 2008, at 4:19 AM, Alan Mackenzie wrote:

Hi, Xah!

though, isn't this something easy to fix?

No, because it isn't a bug. It's the way the function is meant to work. If there is a bug, it's that the doc-string (and maybe the elisp manual,
I haven't looked) is vague and incomplete.

I've amended the Emacs manual (.../doc/emacs/programs.texi) and the doc
strings of `backward-up-list' and several similar functions
(.../lisp/emacs-lisp/lisp.el).

If you're interested, have a look at the changes in
<http://cvs.savannah.gnu.org/viewvc/emacs/?root=emacs>.

--
Alan Mackenzie (Nuremberg, Germany).

☄






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