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|
;;; paren.el --- highlight matching paren.
;; Copyright (C) 1993 Free Software Foundation, Inc.
;; Author: rms@gnu.ai.mit.edu
;; Maintainer: FSF
;; Keywords: languages, faces
;; This file is part of GNU Emacs.
;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
;;; Commentary:
;; Load this and it will display highlighting on whatever
;; paren matches the one before or after point.
;;; 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)
(defvar show-paren-face 'region
"*Name of face to use for showing the matching paren.")
;; Find the place to show, if there is one,
;; and show it until input arrives.
(defun show-paren-command-hook ()
;; Do nothing if no window system to display results with.
;; Do nothing if executing keyboard macro.
;; Do nothing if input is pending.
(if (and window-system (not executing-kbd-macro) (sit-for 0))
(let (pos dir mismatch (oldpos (point))
(face show-paren-face))
(cond ((eq (char-syntax (following-char)) ?\()
(setq dir 1))
((eq (char-syntax (preceding-char)) ?\))
(setq dir -1)))
(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
(make-face 'paren-mismatch)
(setq show-paren-mismatch-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)
(current-buffer))
(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
(current-buffer))
(setq show-paren-overlay
(make-overlay (- pos dir) pos)))
(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))
(and show-paren-overlay-1 (overlay-buffer show-paren-overlay-1)
(delete-overlay show-paren-overlay-1)))))))
(if window-system
(progn
(setq blink-paren-function nil)
(add-hook 'post-command-hook 'show-paren-command-hook)))
;;; This is in case paren.el is preloaded.
(add-hook 'window-setup-hook
(function (lambda ()
(if window-system
(progn
(setq blink-paren-function nil)
(add-hook 'post-command-hook
'show-paren-command-hook))))))
(provide 'paren)
;;; paren.el ends here
|
