* regexp-exec fails for long strings
@ 2002-04-25 20:05 Thien-Thi Nguyen
2002-04-25 21:47 ` rm
0 siblings, 1 reply; 7+ messages in thread
From: Thien-Thi Nguyen @ 2002-04-25 20:05 UTC (permalink / raw)
Cc: guile-user
well, good and bad news.
the good news is that another guile project was recently added to the
projects list. the bad news is that for www.gnu.org, template.scm now
fails due to unfulfilled regexp matching. (this has resulted in an
empty project page there.) below is a test case that demonstrates the
problem. running "pre-inst-guile -s" on it shows three "ok" and three
"FAIL" for both HEAD and branch_release-1-6.
if someone can confirm similar behavior on another system (perhaps by
varying the appended string length), i will add this to the bugs db.
(i ask for this confirmation because my system's old sdrams are prone to
mysterious failures, and i want to rule that out as a reason.)
thi
____________________________________________
(use-modules (ice-9 regex))
(define ok "<section_name>Projects List</section_name>")
(define rx (make-regexp "<section_name>(.*)</section_name>"))
(define (+space s n)
(string-append s (make-string n #\space)))
(define (test s)
(format #t "string-length ~A\t=> ~A\n"
(string-length s)
(if (regexp-exec rx s)
"ok"
"FAIL")))
;; do it
(test ok) ; ok
(test (+space ok 11672)) ; ok
(test (+space ok 11673)) ; ok
(test (+space ok 11674)) ; FAIL
(test (+space ok 11675)) ; FAIL
(test (+space ok 11700)) ; FAIL
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^ permalink raw reply [flat|nested] 7+ messages in thread* Re: regexp-exec fails for long strings
2002-04-25 20:05 regexp-exec fails for long strings Thien-Thi Nguyen
@ 2002-04-25 21:47 ` rm
2002-04-25 23:29 ` Thien-Thi Nguyen
2002-04-26 4:32 ` Tom Lord
0 siblings, 2 replies; 7+ messages in thread
From: rm @ 2002-04-25 21:47 UTC (permalink / raw)
Cc: bug-guile, guile-user
On Thu, Apr 25, 2002 at 01:05:50PM -0700, Thien-Thi Nguyen wrote:
>[...]
> if someone can confirm similar behavior on another system (perhaps by
> varying the appended string length), i will add this to the bugs db.
> (i ask for this confirmation because my system's old sdrams are prone to
> mysterious failures, and i want to rule that out as a reason.)
Ok, this is on my rather 'old' guile-1.5 box (the guile-HEAD is at home):
| guile> (version)
| "1.5.0"
| guile> (use-modules (ice-9 regex))
| guile>
| guile> (define ok "<section_name>Projects List</section_name>")
| guile>
| guile> (define rx (make-regexp "<section_name>(.*)</section_name>"))
| guile>
| guile> (define (+space s n)
| ... (string-append s (make-string n #\space)))
| guile>
| guile> (define (test s)
| ... (format #t "string-length ~A\t=> ~A\n"
| ... (string-length s)
| ... (if (regexp-exec rx s)
| ... "ok"
| ... "FAIL")))
| guile> (test ok)
| string-length 42 => ok
| guile> (test (+space ok 11672))
| string-length 11714 => ok
| guile> (test (+space ok 11673))
| string-length 11715 => ok
| guile> (test (+space ok 11674))
| string-length 11716 => FAIL
| guile> (test (+space ok 11675))
| string-length 11717 => FAIL
| guile> (test (+space ok 11700))
| string-length 11742 => FAIL
| guile>
|
Hmmm, never really used guile's regex heavily - that's where i
still use <blush>perl</blush>.
Ralf
> thi
>
> ____________________________________________
> (use-modules (ice-9 regex))
>
> (define ok "<section_name>Projects List</section_name>")
>
> (define rx (make-regexp "<section_name>(.*)</section_name>"))
>
> (define (+space s n)
> (string-append s (make-string n #\space)))
>
> (define (test s)
> (format #t "string-length ~A\t=> ~A\n"
> (string-length s)
> (if (regexp-exec rx s)
> "ok"
> "FAIL")))
>
> ;; do it
> (test ok) ; ok
> (test (+space ok 11672)) ; ok
> (test (+space ok 11673)) ; ok
> (test (+space ok 11674)) ; FAIL
> (test (+space ok 11675)) ; FAIL
> (test (+space ok 11700)) ; FAIL
>
> _______________________________________________
> Guile-user mailing list
> Guile-user@gnu.org
> http://mail.gnu.org/mailman/listinfo/guile-user
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^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: regexp-exec fails for long strings
2002-04-25 21:47 ` rm
@ 2002-04-25 23:29 ` Thien-Thi Nguyen
2002-05-15 3:53 ` Thien-Thi Nguyen
2002-04-26 4:32 ` Tom Lord
1 sibling, 1 reply; 7+ messages in thread
From: Thien-Thi Nguyen @ 2002-04-25 23:29 UTC (permalink / raw)
Cc: bug-guile, guile-user
From: rm@fabula.de
Date: Thu, 25 Apr 2002 23:47:13 +0200
| guile> (test ok)
| string-length 42 => ok
| guile> (test (+space ok 11672))
| string-length 11714 => ok
| guile> (test (+space ok 11673))
| string-length 11715 => ok
| guile> (test (+space ok 11674))
| string-length 11716 => FAIL
| guile> (test (+space ok 11675))
| string-length 11717 => FAIL
| guile> (test (+space ok 11700))
| string-length 11742 => FAIL
| guile>
i traced this to `regexec' (glibc 2.2.4) and stopped -- it's not a guile
bug after all, as far as i could tell. (also, could not reproduce the
behavior under FreeBSD 4.4-RELEASE.)
probably time to apt-get update...
thi
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^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: regexp-exec fails for long strings
2002-04-25 23:29 ` Thien-Thi Nguyen
@ 2002-05-15 3:53 ` Thien-Thi Nguyen
2002-05-15 6:04 ` Wolfgang Jährling
0 siblings, 1 reply; 7+ messages in thread
From: Thien-Thi Nguyen @ 2002-05-15 3:53 UTC (permalink / raw)
From: Thien-Thi Nguyen <ttn@giblet.glug.org>
Date: Thu, 25 Apr 2002 16:29:40 -0700
i traced this to `regexec' (glibc 2.2.4) and stopped -- it's not a guile
bug after all, as far as i could tell. (also, could not reproduce the
behavior under FreeBSD 4.4-RELEASE.)
probably time to apt-get update...
this problem persists w/ glibc 2.2.5. hmmm....
thi
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^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: regexp-exec fails for long strings
2002-05-15 3:53 ` Thien-Thi Nguyen
@ 2002-05-15 6:04 ` Wolfgang Jährling
2002-05-15 8:19 ` Thien-Thi Nguyen
0 siblings, 1 reply; 7+ messages in thread
From: Wolfgang Jährling @ 2002-05-15 6:04 UTC (permalink / raw)
Cc: bug-guile, guile-user
Thien-Thi Nguyen <ttn@giblet.glug.org> wrote:
> From: Thien-Thi Nguyen <ttn@giblet.glug.org>
> Date: Thu, 25 Apr 2002 16:29:40 -0700
>
> i traced this to `regexec' (glibc 2.2.4) and stopped -- it's not a guile
> bug after all, as far as i could tell. (also, could not reproduce the
> behavior under FreeBSD 4.4-RELEASE.)
>
> probably time to apt-get update...
>
> this problem persists w/ glibc 2.2.5. hmmm....
AFAIK, the glibc-people are rewriting the regex code for 2.3, because
the current implementation got unmaintainable and has various strange
limitations. This could be one of those.
Cheers,
GNU/Wolfgang
--
Wolfgang Jährling <wolfgang@pro-linux.de> \\ http://stdio.cjb.net/
Debian GNU/Hurd user && Debian GNU/Linux user \\ http://www.gnu.org/
The Hurd Hacking Guide: http://www.gnu.org/software/hurd/hacking-guide/
["We're way ahead of you here. The Hurd has always been on the ]
[ cutting edge of not being good for anything." -- Roland McGrath ]
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^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: regexp-exec fails for long strings
2002-05-15 6:04 ` Wolfgang Jährling
@ 2002-05-15 8:19 ` Thien-Thi Nguyen
0 siblings, 0 replies; 7+ messages in thread
From: Thien-Thi Nguyen @ 2002-05-15 8:19 UTC (permalink / raw)
Cc: bug-guile, guile-user
From: =?iso-8859-1?Q?Wolfgang_J=E4hrling?= <wolfgang@pro-linux.de>
Date: Wed, 15 May 2002 08:04:20 +0200
AFAIK, the glibc-people are rewriting the regex code for 2.3, because
the current implementation got unmaintainable and has various strange
limitations. This could be one of those.
that's good news (that i wouldn't have known w/o this tip -- thanks!).
i suppose i could contribute this as a test case. i wonder what glibc
testing framework is like.
thi
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^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: regexp-exec fails for long strings
2002-04-25 21:47 ` rm
2002-04-25 23:29 ` Thien-Thi Nguyen
@ 2002-04-26 4:32 ` Tom Lord
1 sibling, 0 replies; 7+ messages in thread
From: Tom Lord @ 2002-04-26 4:32 UTC (permalink / raw)
Cc: ttn, bug-guile, guile-user
Hmmm, never really used guile's regex heavily - that's where i
still use <blush>perl</blush>.
If you want high-power regexps, you should resurrect the Rx interface,
grabbing the latest libhackerlab. In fact, rather than resurrecting
the old Guile Rx interface, you should grab and adapt the one from
systas (not currently in release, but I'll put up a new version soon).
I regularly use regexps that are several KB long, constructed by a
structured regexp compiler similar to the one in SCSH. It's fast,
convenient, and very accurate.
-t
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^ permalink raw reply [flat|nested] 7+ messages in thread
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2002-04-25 20:05 regexp-exec fails for long strings Thien-Thi Nguyen
2002-04-25 21:47 ` rm
2002-04-25 23:29 ` Thien-Thi Nguyen
2002-05-15 3:53 ` Thien-Thi Nguyen
2002-05-15 6:04 ` Wolfgang Jährling
2002-05-15 8:19 ` Thien-Thi Nguyen
2002-04-26 4:32 ` Tom Lord
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