From: Dmitri Boulytchev <db@tepkom.ru>
To: caml-list@inria.fr
Subject: Re: [Caml-list] Re: Regular expression matching against OCaml streams.
Date: Mon, 12 Jan 2009 19:59:55 +0300 [thread overview]
Message-ID: <496B770B.4040205@tepkom.ru> (raw)
In-Reply-To: <loom.20090112T154624-248@post.gmane.org>
>> I don't know of any libraries for this purpose. I will warn anyone
>> making one that it's easy for simple regex matching to evaluate the
>> whole stream, and then fail to match.
>>
>
> Or worse, never terminate. E.g.,
>
> stream_match "a*b" (Stream.from (fun _ -> Some 'a'))
>
I do not see the problem in either case. If you has to match a long
string
you must be ready to fail. And if you are dealing with infinite data
structures
you must be ready not to terminate. At least these arguments did not
prevent OCaml
developers from implementing neither Stream nor, for example,
Lexing.from_function,
which definitely may be used to reproduce these malicious cases :)
Best regards,
DB.
prev parent reply other threads:[~2009-01-12 17:00 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-12 13:00 Dmitri Boulytchev
2009-01-12 14:34 ` [Caml-list] " Edgar Friendly
2009-01-12 15:49 ` Chris Conway
2009-01-12 16:59 ` Dmitri Boulytchev [this message]
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