From: Leo Liu <sdl.web@gmail.com>
To: 14395@debbugs.gnu.org
Subject: bug#14395: 24.3; [PATCH] new feature smie-highlight-matching-block
Date: Tue, 14 May 2013 10:49:20 +0800 [thread overview]
Message-ID: <m138tq46of.fsf@gmail.com> (raw)
[-- Attachment #1: Type: text/plain, Size: 3277 bytes --]
Hi Stefan,
I want something for octave mode that looks like something in the
attached screenshot. But since this is generic I would like to put it in
smie.el. Do you have any objections or comments?
It doesn't make sense for this feature and smie-blink-matching-open to
be on at the same time. So in the patch nothing is enabled.
diff --git a/lisp/emacs-lisp/smie.el b/lisp/emacs-lisp/smie.el
index bbdd9f83..ad23f78c 100644
--- a/lisp/emacs-lisp/smie.el
+++ b/lisp/emacs-lisp/smie.el
@@ -1021,6 +1021,61 @@ (defun smie-blink-matching-open ()
(let ((blink-matching-check-function #'smie-blink-matching-check))
(blink-matching-open))))))))
+(defface smie-matching-block-highlight (:inherit highlight)
+ "Face used to highlight matching block."
+ :group 'smie)
+
+(defvar-local smie-highlight-matching-block-overlay nil)
+(defvar-local smie-highlight-matching-block-lastpos -1)
+
+(defun smie-highlight-matching-block ()
+ (when (and (bound-and-true-p smie-closer-alist)
+ (/= (point) smie-highlight-matching-block-lastpos))
+ (unless (overlayp smie-highlight-matching-block-overlay)
+ (setq smie-highlight-matching-block-overlay
+ (make-overlay (point) (point))))
+ (setq smie-highlight-matching-block-lastpos (point))
+ (let ((open-re (concat "\\_<"
+ (regexp-opt (mapcar 'car smie-closer-alist))
+ "\\_>"))
+ (close-re (concat "\\_<"
+ (regexp-opt (mapcar 'cdr smie-closer-alist))
+ "\\_>"))
+ (beg-of-tok
+ (lambda (re)
+ "Move to the beginning of current token if matching RE."
+ (or (looking-at-p re)
+ (let* ((start (point))
+ (beg (progn
+ (funcall smie-backward-token-function)
+ (and (looking-at-p re) (point))))
+ (end (and beg
+ (progn
+ (funcall smie-forward-token-function)
+ (point)))))
+ (if (and beg (<= beg start) (<= start end))
+ (goto-char beg)
+ (goto-char start)
+ nil)))))
+ (highlight (lambda (beg end)
+ (move-overlay smie-highlight-matching-block-overlay
+ beg end)
+ (overlay-put smie-highlight-matching-block-overlay
+ 'face 'smie-matching-block-highlight))))
+ (save-excursion
+ (cond
+ ((funcall beg-of-tok open-re)
+ (with-demoted-errors
+ (forward-sexp 1)
+ (when (looking-back close-re)
+ (funcall highlight (match-beginning 0) (match-end 0)))))
+ ((funcall beg-of-tok close-re)
+ (funcall smie-forward-token-function)
+ (forward-sexp -1)
+ (when (looking-at open-re)
+ (funcall highlight (match-beginning 0) (match-end 0))))
+ (t (overlay-put smie-highlight-matching-block-overlay 'face nil)))))))
+
;;; The indentation engine.
(defcustom smie-indent-basic 4
[-- Attachment #2: smie-highlight.png --]
[-- Type: image/png, Size: 13452 bytes --]
next reply other threads:[~2013-05-14 2:49 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-14 2:49 Leo Liu [this message]
2013-05-14 16:02 ` bug#14395: 24.3; [PATCH] new feature smie-highlight-matching-block Stefan Monnier
2013-05-15 7:13 ` Leo Liu
2013-05-16 2:31 ` Stefan Monnier
2013-05-16 3:27 ` Leo Liu
2013-05-16 13:24 ` Stefan Monnier
2013-05-16 16:06 ` Leo Liu
2013-05-16 17:51 ` Stefan Monnier
2013-05-16 23:09 ` Leo Liu
2013-05-17 0:40 ` Stefan Monnier
2013-05-17 1:30 ` Leo Liu
2013-05-22 18:50 ` Stefan Monnier
2013-05-16 4:45 ` Glenn Morris
2013-05-16 5:33 ` Leo Liu
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