mirror/emacs
1
0
Fork 0
mirror of https://git.savannah.gnu.org/git/emacs.git synced 2024-12-27 10:54:40 +00:00
Code Issues Releases Activity

Enable the hook only if window-system.

Browse Source 
Clear blink-paren-function at the same time.
(show-paren-command-hook): If after a closeparen,
highlight that closeparen as well as matching open.
Use a different color for a mismatch, if color screen.
This commit is contained in:
Richard M. Stallman 1993-07-18 04:47:10 +00:00
parent 11872f7e1e
commit eb0d9f0861
1 changed files with 71 additions and 44 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

115
lisp/paren.el
View File

@ -28,69 +28,96 @@
;;; Code:
;; This is the overlay used to highlight the matching paren.
(defvar show-paren-overlay nil)
;; This is the overlay used to highlight the closeparen
;; right before point.
(defvar show-paren-overlay-1 nil)
(defvar show-paren-mismatch-face nil)
;; Find the place to show, if there is one,
;; and show it until input arrives.
(defun show-paren-command-hook ()
(if window-system
(let (pos dir mismatch (oldpos (point))
(face (if (face-equal 'highlight 'region)
'underline 'highlight)))
(face 'region))
(cond ((eq (char-syntax (following-char)) ?\()
(setq dir 1))
((eq (char-syntax (preceding-char)) ?\))
(setq dir -1)))
(save-excursion
(save-restriction
;; Determine the range within which to look for a match.
(if blink-matching-paren-distance
(narrow-to-region (max (point-min)
(- (point) blink-matching-paren-distance))
(min (point-max)
(+ (point) blink-matching-paren-distance))))
;; Scan across one sexp within that range.
(condition-case ()
(setq pos (scan-sexps (point) dir))
(error nil))
;; See if the "matching" paren is the right kind of paren
;; to match the one we started at.
(if pos
(let ((beg (min pos oldpos)) (end (max pos oldpos)))
(and (/= (char-syntax (char-after beg)) ?\$)
(setq mismatch
(/= (char-after (1- end))
(logand (lsh (aref (syntax-table)
(char-after beg))
-8)
255))))))
;; If they don't properly match, don't show.
(if mismatch
(progn
(message "Paren mismatch")
;;; (setq pos nil)
))))
(if dir
(save-excursion
(save-restriction
;; Determine the range within which to look for a match.
(if blink-matching-paren-distance
(narrow-to-region (max (point-min)
(- (point) blink-matching-paren-distance))
(min (point-max)
(+ (point) blink-matching-paren-distance))))
;; Scan across one sexp within that range.
(condition-case ()
(setq pos (scan-sexps (point) dir))
(error nil))
;; See if the "matching" paren is the right kind of paren
;; to match the one we started at.
(if pos
(let ((beg (min pos oldpos)) (end (max pos oldpos)))
(and (/= (char-syntax (char-after beg)) ?\$)
(setq mismatch
(/= (char-after (1- end))
(logand (lsh (aref (syntax-table)
(char-after beg))
-8)
255))))))
;; If they don't properly match, use a different face,
;; or print a message.
(if mismatch
(progn
(and (null show-paren-mismatch-face)
(x-display-color-p)
(or (setq show-paren-mismatch-face
(internal-find-face 'paren-mismatch))
(progn
(setq show-paren-mismatch-face
(make-face 'paren-mismatch))
(set-face-background 'paren-mismatch 'purple))))
(if show-paren-mismatch-face
(setq face show-paren-mismatch-face)
(message "Paren mismatch"))))
)))
(cond (pos
(if (= dir -1)
;; If matching backwards, highlight the closeparen
;; before point as well as its matching open.
(progn
(if show-paren-overlay-1
(move-overlay show-paren-overlay-1 (+ (point) dir) (point))
(setq show-paren-overlay-1
(make-overlay (- pos dir) pos)))
(overlay-put show-paren-overlay-1 'face face))
;; Otherwise, turn off any such highlighting.
(and show-paren-overlay-1
(overlay-buffer show-paren-overlay-1)
(delete-overlay show-paren-overlay-1)))
;; Turn on highlighting for the matching paren.
(if show-paren-overlay
(move-overlay show-paren-overlay (- pos dir) pos)
(setq show-paren-overlay
(make-overlay (- pos dir) pos)))
(overlay-put show-paren-overlay 'face face)
;;; This is code to blink the highlighting.
;;; It is desirable to avoid this because
;;; it would interfere with auto-save and gc when idle.
;;; (while (sit-for 1)
;;; (overlay-put show-paren-overlay
;;; 'face
;;; (if (overlay-get show-paren-overlay
;;; 'face)
;;; nil face)))
)
(overlay-put show-paren-overlay 'face face))
(t
;; If not at a paren that has a match,
;; turn off any previous paren highlighting.
(and show-paren-overlay (overlay-buffer show-paren-overlay)
(delete-overlay show-paren-overlay)))))))
(delete-overlay show-paren-overlay))
(and show-paren-overlay-1 (overlay-buffer show-paren-overlay-1)
(delete-overlay show-paren-overlay-1)))))))
(add-hook 'post-command-hook 'show-paren-command-hook)
(if window-system
(progn
(setq blink-paren-function nil)
(add-hook 'post-command-hook 'show-paren-command-hook)))
(provide 'paren)