From: Stefan Monnier <monnier@iro.umontreal.ca>
To: "Ami Fischman" <ami@fischman.org>
Cc: emacs-devel@gnu.org
Subject: Re: crazy interaction between buffer-locality and function-locality of variables
Date: Sun, 02 Nov 2008 15:05:21 -0500 [thread overview]
Message-ID: <jwvej1tucc3.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <9aa0cfde0811020943l24121f8cj78bbf82709036f9d@mail.gmail.com> (Ami Fischman's message of "Sun, 2 Nov 2008 09:43:15 -0800")
> My point was that the only way to avoid mixing the behaviors is to
> make variable names unwieldy. As an async-event-handler-writer all
> function arguments and local variables must be
> globally-uniquely-named, and as a major-mode writer all buffer-local
> variables must be globally-uniquely-named.
Actually, function arguments (and typical local variables) don't need to
be globally unique: they just need to use a name space that's not used
for buffer-local variables.
In Emacs we get this behavior as follows: buffer-local variables should
use a package prefix.
> The latter is perhaps not too terrible a burden, but the former would
> make coding in elisp unbearable IMO.
Indeed, which is why the convention moves the responsability to the
buffer-local side.
>> > there needs to be strong guidance against making variables whose names
>> > /aren't/ prefixed with the package name buffer-local.
>> Agreed. Where would you like to see it? In the coding conventions?
> At least also at the same place as the warning about the conflict
> between buffer-locals and let-binding in elisp.info that I pointed to
> in my original email. But also this should be a great big warning in
> the defun docs of the make-variable-*-local and make-local-variable
> since it's the authors using those functions (and friends? I don't
> have a complete list) that must shoulder the burden of avoiding
> collisions.
Hmm... at the place you mentioned in the elisp.info, we're kind of far
from discussing naming conventions, but I'll try and add a cross-ref.
Stefan
next prev parent reply other threads:[~2008-11-02 20:05 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-02 3:34 crazy interaction between buffer-locality and function-locality of variables Ami Fischman
2008-11-02 16:57 ` Stefan Monnier
2008-11-02 17:43 ` Ami Fischman
2008-11-02 20:05 ` Stefan Monnier [this message]
2008-11-02 20:31 ` crazy interaction between buffer-locality and function-localityof variables Drew Adams
2008-11-02 23:19 ` crazy interaction between buffer-locality and function-locality of variables Richard M. Stallman
2008-11-02 23:59 ` Ami Fischman
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