From: Marco Maggi <marco.maggi-ipsu@poste.it>
To: Panicz Maciej Godek <godek.maciek@gmail.com>
Cc: guile-user@gnu.org
Subject: Re: Pattern matching issues
Date: Wed, 13 Jul 2011 07:40:38 +0200 [thread overview]
Message-ID: <87wrfmzqjt.fsf@rapitore.luna> (raw)
In-Reply-To: marco.maggi-ipsu@poste.it (Panicz Maciej Godek's message of "Tue, 12 Jul 2011 23:05:26 +0200")
Panicz Maciej Godek wrote:
> I've been wondering if there is a way to represent this
> sort of pattern for the pattern matcher provided by Wright
> (and Guile).
The syntax should be something like:
(match '(Mr Hulot and I need a vacation)
((?x ... 'need ?y ...)
(write (list ?x ?y))
(newline)))
but at present multiple ellipses are not supported at the
same level (that is in the same list or the same vector).
It is possible to do it, but a policy (greedy/non-greedy)
must be adopted to solve ambiguous cases and it gets
complicated.
HTH
--
Marco Maggi
next prev parent reply other threads:[~2011-07-13 5:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-12 21:05 Pattern matching issues Panicz Maciej Godek
2011-07-12 22:21 ` Ludovic Courtès
2011-07-13 5:40 ` Marco Maggi [this message]
2011-07-13 10:42 ` Panicz Maciej Godek
2011-07-23 18:44 ` Linas Vepstas
2011-07-25 10:44 ` Andy Wingo
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