From: Alexander Shukaev <haroogan@gmail.com>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: emacs-devel <emacs-devel@gnu.org>
Subject: Re: Isearch: add variable to control search match group
Date: Tue, 25 Aug 2015 17:06:37 +0200 [thread overview]
Message-ID: <CAKu-7Wwz-um521g3tbCPfE4bGt3OU0MGDGaC=QYEehDrQ=cVgw@mail.gmail.com> (raw)
In-Reply-To: <jwvegir1l8t.fsf-monnier+emacs@gnu.org>
>> interactive one). Imagine that my search module wants to search for
>
>> \(^\|\s-+?\)(;;)\($\|\s-+?\)
>
>> and I am actually only interested in the "(;;)" part since I also want
>> to highlight it (with both, current match highlighting and all matches
>> lazy highlighting). Then, clearly, "\(^\|\s-+?\)" and "\($\|\s-+?\)"
>> are just anchors.
>
> How do you do that currently? I'd expect that to do the above, you'd
> set isearch-search-fun-function, and that function can take care of
> shuffling the match-data so that the interesting part is
> match-subgroup 0.
(defun my-search-function
(&optional forward regexp-p wrap-p)
"Return search function.
If FORWARD is non-nil, search forward, otherwise backward.
If REGEXP-P is non-nil, input is treated as regular expression.
If WRAP-P is non-nil, search can wrap around top or bottom of buffer."
`(lambda
(string &optional bound noerror count)
(let* ((point (point))
(function ',(if regexp-p
(if forward
#'re-search-forward
#'re-search-backward)
(if forward
#'search-forward
#'search-backward)))
(result (funcall function
string
bound
,(if wrap-p t 'noerror)
count)))
(when (and (null result) ,wrap-p)
(goto-char ,(if forward '(point-min) '(point-max)))
(unwind-protect
(setq result (funcall function string bound noerror count))
(unless result
(goto-char point))))
result)))
(defun devil-isearch-search-fun ()
"Return Isearch-compatible search function.
Based on `isearch-forward' and `isearch-regexp'."
(my-search-function isearch-forward
isearch-regexp
t))
(defun my-isearch-input
(&optional string forward regexp-p history-p)
"Search for (user-entered) input in specified direction."
...
(let (...
(isearch-search-fun-function #'my-isearch-search-fun)
...)
...
(if forward (isearch-forward regexp-p) (isearch-backward regexp-p))
...))
Do you mean that I can modify `my-search-function' in such a way that
the calls to `match-beginning' and `match-end' with group 0 happening
inside and after calls to `isearch-forward' and `isearch-backward'
will return the positions of the middle group excluding anchors? If
yes, then maybe you could show me how to achieve that? Thanks.
Regards,
Alexander
next prev parent reply other threads:[~2015-08-25 15:06 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-24 23:55 Isearch: add variable to control search match group Alexander Shukaev
2015-08-25 14:45 ` Stefan Monnier
2015-08-25 15:06 ` Alexander Shukaev [this message]
2015-08-25 22:08 ` Stefan Monnier
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