From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Lars Ingebrigtsen Newsgroups: gmane.emacs.devel Subject: Text property searching Date: Mon, 16 Apr 2018 00:56:00 +0200 Message-ID: <87lgdo5bb3.fsf@mouse.gnus.org> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1523832897 7012 195.159.176.226 (15 Apr 2018 22:54:57 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Sun, 15 Apr 2018 22:54:57 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Mon Apr 16 00:54:53 2018 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1f7qXs-0001fK-36 for ged-emacs-devel@m.gmane.org; Mon, 16 Apr 2018 00:54:52 +0200 Original-Received: from localhost ([::1]:49734 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1f7qZw-00042M-Pz for ged-emacs-devel@m.gmane.org; Sun, 15 Apr 2018 18:57:00 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:52907) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1f7qZC-00041j-37 for emacs-devel@gnu.org; Sun, 15 Apr 2018 18:56:15 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1f7qZ9-0005t7-26 for emacs-devel@gnu.org; Sun, 15 Apr 2018 18:56:14 -0400 Original-Received: from hermes.netfonds.no ([80.91.224.195]:40409) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1f7qZ8-0005p0-R2 for emacs-devel@gnu.org; Sun, 15 Apr 2018 18:56:10 -0400 Original-Received: from 46.67.12.60.tmi.telenormobil.no ([46.67.12.60] helo=corrigan) by hermes.netfonds.no with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.84_2) (envelope-from ) id 1f7qZ4-0006xq-Bk for emacs-devel@gnu.org; Mon, 16 Apr 2018 00:56:08 +0200 Original-Received: from larsi by corrigan with local (Exim 4.89) (envelope-from ) id 1f7qYy-0005x5-Bk for emacs-devel@gnu.org; Mon, 16 Apr 2018 00:56:00 +0200 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 80.91.224.195 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.org gmane.emacs.devel:224627 Archived-At: I've suggested a few times before that it would be nice to have search functions that are... nicer... than the ones we have now (`text-property-any' and `next-single-property-change'), and the maintainer(s) at the time said "sure". I think. But I never implemented that wonderful function, because I could never decide what it would look like. But last night I think I got it: It should be just like search-forward, only not. (Hm. I'm feeling a slight sense of deja vu while typing this -- have I had this revelation before but forgotten about it?) Anyway: Let's say you have a region in the buffer that has the text property `shr-url' with the value "http://fsf.org/", then: (text-property-search-forward 'shr-url "http://fsf.org/" t) would place point at the end of that region, and `match-beginning' and `match-end' would point to the start and end. The `t' there is the predicate: `t' means "equal", `nil' means "not equal", and then you can write your own predicates for other uses. So, to collect all urls from text properties, you'd write: (while (text-property-search-forward 'shr-url nil nil) (push (get-text-property (match-beginning 0) 'shr-url) urls)) and that's it. Or to collect all images: (while (text-property-search-forward 'display 'image (lambda (elem val) (and (consp elem) (eq (car elem) val)))) (push (plist-get (cdr (get-text-property (match-beginning 0) 'display)) :data) images)) Does this look OK to everybody? -- (domestic pets only, the antidote for overdose, milk.) bloggy blog: http://lars.ingebrigtsen.no