From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Comparing version numbers
Date: Mon, 13 Nov 2017 09:10:50 +0100
Date: 2017-11-13T09:10:50+01:00 [thread overview]
Message-ID: <oubk2a$7mb$1@gioia.aioe.org> (raw)
In-Reply-To: oub0kd$1a6r$1@gioia.aioe.org
On 13/11/2017 03:39, Victor Porton wrote:
> Not sure if it is quite on-topic, because it is more about general
> programming ideas rather than about Ada. (However, a solution in Python or
> Ruby or JavaScript would more likely used regexps than Ada.)
I doubt regular expressions would help here, or any other kind of text
patterns language. It is not a pattern matching problem.
> Suppose I have two version numbers of a software. I need to check which of
> the two is greater.
>
> Lexical order string comparison does not work:
>
> "2.3" vs "11.4".
>
> I could split it by "." and compare the numbers. But a component of a
> version numbers may be nonnumeric like:
>
> "1.2beta".
>
> What to do?
Is it what you are looking for:
http://www.dmitry-kazakov.de/ada/strings_edit.htm#11
> It should work for example for all Debian packages containing interpreters
> (for example, "2.7" for "python" package).
AFAIK, Debian's dh-make has somewhere an operation to compare versions
the way apt does. I don't remember where. but it is there.
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
next prev parent reply other threads:[~2017-11-13 8:10 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-13 2:39 Comparing version numbers Victor Porton
2017-11-13 5:15 ` J-P. Rosen
2017-11-13 8:04 ` briot.emmanuel
2017-11-13 11:11 ` Simon Wright
2017-11-13 21:30 ` briot.emmanuel
2017-11-13 8:10 ` Dmitry A. Kazakov [this message]
2017-11-13 15:56 ` Victor Porton
2017-11-13 17:22 ` Dmitry A. Kazakov
2017-11-13 18:54 ` Victor Porton
2017-11-13 20:25 ` Dmitry A. Kazakov
2017-11-16 15:33 ` Robert Eachus
2017-11-17 14:45 ` Shark8
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