From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Daniel Colascione <dan.colascione@gmail.com>
Cc: 6985@debbugs.gnu.org
Subject: bug#6985: rx patterns don't compose
Date: Sun, 05 Sep 2010 09:22:04 +0200 [thread overview]
Message-ID: <jwvfwxohd13.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <4C82D84D.7040205@gmail.com> (Daniel Colascione's message of "Sat, 04 Sep 2010 16:37:49 -0700")
> It's not possible to do this currently:
> (defconst foo-re (rx "abc"))
> (defconst bar-re (rx (* (what-goes-here? foo-re)))
(defconst foo-re (rx "abc"))
(defconst bar-re `(rx (* (regexp ,foo-re)))
> in any sensible way. This won't work
> (defconst bar-re (rx (* (regexp foo-re))))
> because regexp always expects a string.
> This won't work, because eval always quotes its argument:
> (defconst bar-re (rx (* (eval foo-re))))
> I propose allowing regexp to accept a symbol as well as a string, and
> using that symbol's value literally. Alternatively, rx could provide an
> eval-unquoted facility. Or both.
eval-unquoted sounds OK
Stefan
next prev parent reply other threads:[~2010-09-05 7:22 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-04 23:37 bug#6985: rx patterns don't compose Daniel Colascione
2010-09-05 7:22 ` Stefan Monnier [this message]
2010-09-05 7:39 ` Andreas Schwab
2010-09-05 7:42 ` Daniel Colascione
2010-09-05 10:45 ` Andreas Schwab
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