From: Peter Stephenson <pws@csr.com>
To: zsh-workers@sunsite.dk (Zsh hackers list)
Subject: Re: PATCH: improve ${(q)...}
Date: Wed, 29 Apr 2009 17:42:37 +0100 [thread overview]
Message-ID: <200904291642.n3TGgbj5015904@news01.csr.com> (raw)
In-Reply-To: <090429093553.ZM9854@torch.brasslantern.com>
Bart Schaefer wrote:
> On Apr 29, 9:51am, Peter Stephenson wrote:
> I'm not necessarily thinking of any specific example. With the current
> code, ${(qqq)${(qq)v}} produces "'foo'" which still has single quotes
> after one level of quotes is stripped. If that's combined with another
> string that also contains single quotes, whether by directly adjacent
> concatenation or by interpolation inside a double-quoted string, etc.,
> those quotes might mean something.
I still can't see how this can have an effect, but I think it's moot
anyway.
> } I won't rely on my expectation here---it's different with backslash
> } quoting anyway. However, you've certainly spotted a case I hadn't where
> } this changes the behaviour. I can look for different letters...
> } Hmm, we could use qQ which is currently meaningless as a sort of
> } shorthand for "minimal quoting"...?
>
> What does (qqQQ) mean, then? Or (qQq)? It'd probably be better to pick
> something that currently isn't even valid syntax, like (q-) ... I was
> all set to suggest (q1) (q2) etc. but (q0) already means "split at NULL
> bytes and then quote". However, (q-) raises the question of what (-q)
> means, and whether (-) by itself means anything; the only character that
> is currently "attached" to a preceding flag is ":" and (q:EXPR:) seems
> like overkill.
(q-) seems harmless and - on its own can be a syntax error as at
present. I can't see any problem with that. All this means as a
precedent is it would probably be better never to add - as a flag on its
own, which I can live with.
--
Peter Stephenson <pws@csr.com> Software Engineer
CSR PLC, Churchill House, Cambridge Business Park, Cowley Road
Cambridge, CB4 0WZ, UK Tel: +44 (0)1223 692070
prev parent reply other threads:[~2009-04-29 16:42 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-28 16:46 Peter Stephenson
2009-04-28 22:37 ` Bart Schaefer
2009-04-29 8:51 ` Peter Stephenson
2009-04-29 16:35 ` Bart Schaefer
2009-04-29 16:42 ` Peter Stephenson [this message]
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