From: "Andreas Röhler" <andreas.roehler@easy-emacs.de>
To: npostavs@gmail.com
Cc: 35708@debbugs.gnu.org
Subject: bug#35708: [27.0.50]: thingatpt.el, thing-at-point-looking-at redundant
Date: Tue, 14 May 2019 12:02:15 +0200 [thread overview]
Message-ID: <364b372e-7896-d92c-f848-0e7abc152a20@easy-emacs.de> (raw)
In-Reply-To: <8536lixikt.fsf@gmail.com>
On 13.05.19 21:25, npostavs@gmail.com wrote:
> Andreas Röhler <andreas.roehler@easy-emacs.de> writes:
>
>> Thought at something like below, which should pass the test:
>>
>> (defun ar-thing-at-point-looking-at (regexp)
>> "Return t if regexp matches at or before point, nil otherwise."
>> (save-excursion
>> (while (not (or (looking-at regexp)(bolp)))
>> (forward-char -1))
>> (looking-at regexp)))
> I think it's an optimization to use re-search-backward instead of moving
> on character at a time and calling looking-at in lisp.
>
>
Hmm, current thing-at-point-looking-at might be slow with large buffers.
The slightly modified test should reveal it:
(ert-deftest thing-at-point-looking-at-2 ()
(with-temp-buffer
(insert "1abcd 222abcd")
(dotimes (_ 99999) (insert " asdf "))
(goto-char (point-min))
(let ((m2 (progn (search-forward "2abcd")
(match-data))))
(goto-char (point-min))
(search-forward "2ab")
(should (thing-at-point-looking-at "2abcd"))
(should (equal (match-data) m2)))))
But let me correct the alternative delivered, as it didn't match before
point:
(defun ar-regexp-atpt (regexp)
"Return t if REGEXP matches at or before point, nil otherwise.
Changes match-data"
(save-excursion
(if (looking-at regexp)
(while
(save-excursion
(and (not (bobp))
(progn (backward-char) (looking-at regexp)))))
(while (not (or (bobp) (backward-char) (looking-at regexp))))
(ar-regexp-atpt regexp))
(looking-at regexp)))
next prev parent reply other threads:[~2019-05-14 10:02 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-13 7:19 bug#35708: [27.0.50]: thingatpt.el, thing-at-point-looking-at redundant Andreas Röhler
2019-05-13 12:41 ` Noam Postavsky
2019-05-13 18:31 ` Andreas Röhler
2019-05-13 19:25 ` npostavs
2019-05-14 10:02 ` Andreas Röhler [this message]
2019-05-14 10:49 ` Andreas Röhler
2019-05-14 14:34 ` npostavs
2019-05-15 6:59 ` Andreas Röhler
2019-05-15 10:11 ` Andreas Röhler
2019-05-20 17:17 ` Noam Postavsky
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