From: "Bart Schaefer" <schaefer@candle.brasslantern.com>
To: zsh-workers@sunsite.auc.dk
Subject: Re: PATCH: new parameter expansion type?
Date: Mon, 30 Aug 1999 16:05:58 +0000 [thread overview]
Message-ID: <990830160558.ZM6355@candle.brasslantern.com> (raw)
In-Reply-To: <199908300949.LAA20865@beta.informatik.hu-berlin.de>
On Aug 30, 11:49am, Sven Wischnowsky wrote:
} Subject: PATCH: new parameter expansion type?
}
} ${name^pattern^then^else}
}
} Gives you the (substituted) `then' string if the expansion of `name'
} matches the `pattern' and otherwise it gives you the `else' string.
Isn't this just the same as
${${${(M)name#pattern}:+then}:-else}
except of course that you have to be a little selective about whether
you use # or % to delimit the pattern?
I'm not particularly excited by the ^test^true^false syntax nor by the
trick of making "." magic in the true/false strings. I vote against this
patch, in its current form at least. Sorry, Sven.
} Ok, the `.' thingy is just because I couldn't think of a better
} character/syntax (suggestions?) and this isn't as powerful as I would
} like it because `then' and `else' can't expand to arrays. Maybe we
} could make `${(A)foo^?^$arr1^$arr2}' do that (and maybe we could do
} the same for `${(A)foo:-$arr}'.
This is essentially the same problem as ${(A)foo:=string} where it would
be nice to be able to have "string" be interpreted as an array. I pointed
out the parsing problem with this back at that time. It would be nice to
have a solution; Andrej suggested ${(A)foo:=(val1 val2 ...)} but it will
require a change to the parser to make that work.
--
Bart Schaefer Brass Lantern Enterprises
http://www.well.com/user/barts http://www.brasslantern.com
next prev parent reply other threads:[~1999-08-30 16:06 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-08-30 9:49 Sven Wischnowsky
1999-08-30 10:06 ` Andrej Borsenkow
1999-08-30 10:58 ` Tanaka Akira
1999-08-30 16:05 ` Bart Schaefer [this message]
1999-08-30 16:10 ` Peter Stephenson
1999-08-30 10:38 Sven Wischnowsky
1999-08-31 13:18 ` Andrej Borsenkow
1999-08-31 8:50 Sven Wischnowsky
1999-08-31 17:47 ` Bart Schaefer
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