From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Drew Adams <drew.adams@oracle.com> Newsgroups: gmane.emacs.bugs Subject: bug#27896: [External] : Re: bug#27896: 25.2; `C-M-%' with `rectangle-mark-mode' Date: Fri, 5 Feb 2021 16:19:06 +0000 Message-ID: <SA2PR10MB44741A63A4C7EA23A6F63421F3B29@SA2PR10MB4474.namprd10.prod.outlook.com> References: <8b30a5cc-24db-4bca-94bd-50c79e65b43a@default> <cf0b64a5-dab3-4a71-b49b-fd9b20e77b41@default> <87pn1eiv4m.fsf@gnus.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="24905"; mail-complaints-to="usenet@ciao.gmane.io" Cc: "27896@debbugs.gnu.org" <27896@debbugs.gnu.org>, Juri Linkov <juri@linkov.net> To: Lars Ingebrigtsen <larsi@gnus.org> Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Fri Feb 05 17:20:15 2021 Return-path: <bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org> Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from <bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org>) id 1l83qB-0006Pk-J1 for geb-bug-gnu-emacs@m.gmane-mx.org; 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The rectangular region keeps > > the ordinary region as the domain of text that search tries > > to match, and it filters the matches against that domain to > > remove any matches that are not wholly within the limits of > > the rectangle. >=20 > Yup. It's a pretty odd design decision, though -- > I wonder whether it this happened on purpose or > whether that was just the simplest way to implement this. I'm pretty sure it was done this way just because that's much simpler to do. Filtering is after the fact - after matching. And matching respects only the buffer restriction (`point-(min|max)'). In search+.el I make it possible (via an option) to actually limit search to the active region. That is, search matches cannot extend beyond the region limits. That feature required quite a few changes to the Isearch code, even if most of them were simple. (The general idea is to bind two vars for active region begin and end and respecting the option, and then replace calls to `point-(min|max)' by those vars. IOW, instead of limiting search to the buffer restriction, limit it to the region.) What this request is about amounts to doing something similar, but doing that with all of the begin and end bits of a noncontiguous region. I haven't yet had the time (or motivation) to do that in my code. I think it would greatly help Emacs to have such a feature, i.e., to truly treat the limits of each zone of a noncontiguous region as search limits. Now, a question arises as to whether, if we did have such a feature, it would _also_ be good to still have the behavior that we have now, i.e. still be able to have a filter work on matches for the full buffer, that is, to _not_ limit the search tries to the region. I'm guessing that it _would_ be good to conserve the current behavior, i.e., to have a variable that chooses which behavior to use. But I don't have a good idea of why I think both can be useful. One reason to keep (also) the current behavior might be backward compatibility, of course. But my gut whispers that there are other reasons. I haven't really thought about it much. > I've added Juri to the CCs; perhaps he can clarify. > (The problem is that if you ask to replace "foo.*bar", and you have > foo bar bar > then `query-replace' will match the entire line, and then filter out > that match (given that we have a rectangular region that covers just > "foo bar") and not replace anything.) It's more important than that. But yeah, that at least illustrates one difference. The point is this: the search boundaries are currently `point-min' and `point-max', which respect only narrowing. If you want to limit search to a region then you need to narrow to it. With isearch+.el you can have search respect the region limits without narrowing (so you can see the surrounding text while searching - you can even optionally dim that surrounding text). And in this case the region bounds act just like the buffer bounds: _matching_, itself, (not just filtering) is limited to the region text. Also with Isearch+ you can search a set of zones, i.e., a noncontiguous region (while showing or hiding the antizones). But in this case, the limits of those region pieces (zones) aren't used for matching; they're used only for filtering. IOW, with my code searching within zones has the same fault that vanilla Isearch has for searching within a region using a filter that restricts to the region: it _matches_ beyond what should be the search space, and _then it filters_ out any matches that extend beyond the search space. In a nutshell, the requested feature is to be able (but not be required) to not only _filter_ out matches that go beyond zone limits but also to not allow those matches in the first place. That is, _limit matching_ itself to be within such bounds. (Note: a noncontiguous region need not be rectangular. This feature would apply to any sequence of buffer zones.)