From: Vincent Lefevre <vincent@vinc17.net>
To: zsh-workers@zsh.org
Subject: Re: behavior of test true -a \( ! -a \)
Date: Thu, 21 Mar 2024 12:04:44 +0100 [thread overview]
Message-ID: <20240321110444.GC164665@qaa.vinc17.org> (raw)
In-Reply-To: <1443395979.5911218.1711016896863@mail.virginmedia.com>
On 2024-03-21 10:28:16 +0000, Peter Stephenson wrote:
> I haven't had time to go through this completely but I think somewhere
> near the root of the issue is this chunk in par_cond_2(), encountered at
> the opint we get to the "!":
>
> if (tok == BANG) {
> /*
> * In "test" compatibility mode, "! -a ..." and "! -o ..."
> * are treated as "[string] [and] ..." and "[string] [or] ...".
> */
> if (!(n_testargs > 2 && (check_cond(*testargs, "a") ||
> check_cond(*testargs, "o"))))
> {
> condlex();
> ecadd(WCB_COND(COND_NOT, 0));
> return par_cond_2();
> }
> }
>
> in which case it needs yet more logic to decide why we shouldn't treat !
> -a as a string followed by a logical "and" in this case. To be clear,
> obviously *I* can see why you want that, the question is teaching the
> code without confusing it further.
Perhaps follow the coreutils logic. What matters is that if there is
a "(" argument, it tries to look at a matching ")" argument among the
following 3 arguments. So, for instance, if it can see
( arg2 arg3 )
(possibly with other arguments after the closing parenthesis[*]), it
will apply the POSIX test on 4 arguments.
[*] which can make sense if the 5th argument is -a or -o.
--
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
next prev parent reply other threads:[~2024-03-21 11:05 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-21 10:07 Vincent Lefevre
2024-03-21 10:28 ` Peter Stephenson
2024-03-21 11:04 ` Vincent Lefevre [this message]
2024-03-21 11:29 ` Peter Stephenson
2024-03-21 12:18 ` Vincent Lefevre
2024-03-21 12:25 ` Peter Stephenson
2024-03-21 19:06 ` Bart Schaefer
2024-03-22 5:02 ` Bart Schaefer
2024-03-25 16:38 ` Peter Stephenson
2024-03-25 17:36 ` Bart Schaefer
2024-04-03 13:59 ` Vincent Lefevre
2024-03-21 17:39 ` Bart Schaefer
2024-03-23 21:48 ` Bart Schaefer
2024-03-23 22:20 ` Vincent Lefevre
2024-03-23 22:41 ` Bart Schaefer
2024-03-23 23:33 ` Lawrence Velázquez
2024-03-24 0:14 ` Bart Schaefer
2024-03-24 2:52 ` Lawrence Velázquez
2024-03-25 10:23 ` Vincent Lefevre
2024-03-25 15:21 ` Bart Schaefer
2024-03-25 17:33 ` Vincent Lefevre
2024-03-25 17:43 ` Bart Schaefer
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