Commit | Line | Data |
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5e28918b | 1 | ;;; paren.el --- highlight matching paren. |
e788f291 | 2 | ;; Copyright (C) 1993 Free Software Foundation, Inc. |
5e28918b | 3 | |
e4c37df7 JB |
4 | ;; Author: rms@gnu.ai.mit.edu |
5 | ;; Maintainer: FSF | |
6 | ;; Keywords: languages, faces | |
5e2325c9 | 7 | |
5e28918b JB |
8 | ;; This file is part of GNU Emacs. |
9 | ||
10 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
11 | ;; it under the terms of the GNU General Public License as published by | |
12 | ;; the Free Software Foundation; either version 2, or (at your option) | |
13 | ;; any later version. | |
14 | ||
15 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | ;; GNU General Public License for more details. | |
19 | ||
20 | ;; You should have received a copy of the GNU General Public License | |
21 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
22 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
23 | ||
24 | ;;; Commentary: | |
25 | ||
26 | ;; Load this and it will display highlighting on whatever | |
27 | ;; paren matches the one before or after point. | |
28 | ||
29 | ;;; Code: | |
30 | ||
eb0d9f08 | 31 | ;; This is the overlay used to highlight the matching paren. |
d1475aa1 | 32 | (defvar show-paren-overlay nil) |
eb0d9f08 RS |
33 | ;; This is the overlay used to highlight the closeparen |
34 | ;; right before point. | |
35 | (defvar show-paren-overlay-1 nil) | |
36 | ||
37 | (defvar show-paren-mismatch-face nil) | |
5e28918b | 38 | |
30322a27 RS |
39 | (defvar show-paren-face 'region |
40 | "*Name of face to use for showing the matching paren.") | |
41 | ||
d1475aa1 JB |
42 | ;; Find the place to show, if there is one, |
43 | ;; and show it until input arrives. | |
44 | (defun show-paren-command-hook () | |
bac79b51 | 45 | ;; Do nothing if no window system to display results with. |
e4b93bab | 46 | ;; Do nothing if executing keyboard macro. |
bac79b51 | 47 | ;; Do nothing if input is pending. |
d196a64d | 48 | (if (and window-system (not executing-kbd-macro) (sit-for 0 100)) |
80e16738 | 49 | (let (pos dir mismatch (oldpos (point)) |
30322a27 | 50 | (face show-paren-face)) |
cde4c890 RS |
51 | (cond ((eq (char-syntax (preceding-char)) ?\)) |
52 | (setq dir -1)) | |
53 | ((eq (char-syntax (following-char)) ?\() | |
54 | (setq dir 1))) | |
eb0d9f08 RS |
55 | (if dir |
56 | (save-excursion | |
57 | (save-restriction | |
58 | ;; Determine the range within which to look for a match. | |
59 | (if blink-matching-paren-distance | |
60 | (narrow-to-region (max (point-min) | |
61 | (- (point) blink-matching-paren-distance)) | |
62 | (min (point-max) | |
63 | (+ (point) blink-matching-paren-distance)))) | |
64 | ;; Scan across one sexp within that range. | |
65 | (condition-case () | |
66 | (setq pos (scan-sexps (point) dir)) | |
67 | (error nil)) | |
68 | ;; See if the "matching" paren is the right kind of paren | |
69 | ;; to match the one we started at. | |
70 | (if pos | |
71 | (let ((beg (min pos oldpos)) (end (max pos oldpos))) | |
72 | (and (/= (char-syntax (char-after beg)) ?\$) | |
73 | (setq mismatch | |
080d320d RS |
74 | (not (eq (char-after (1- end)) |
75 | ;; This can give nil. | |
76 | (matching-paren (char-after beg)))))))) | |
eb0d9f08 RS |
77 | ;; If they don't properly match, use a different face, |
78 | ;; or print a message. | |
79 | (if mismatch | |
80 | (progn | |
81 | (and (null show-paren-mismatch-face) | |
82 | (x-display-color-p) | |
e8f9dff9 | 83 | (or (internal-find-face 'paren-mismatch) |
eb0d9f08 | 84 | (progn |
a1251f79 | 85 | (make-face 'paren-mismatch) |
30322a27 | 86 | (set-face-background 'paren-mismatch |
a060984a RS |
87 | "purple") |
88 | (set-face-foreground 'paren-mismatch | |
89 | "white"))) | |
e8f9dff9 | 90 | (setq show-paren-mismatch-face 'paren-mismatch)) |
eb0d9f08 RS |
91 | (if show-paren-mismatch-face |
92 | (setq face show-paren-mismatch-face) | |
93 | (message "Paren mismatch")))) | |
94 | ))) | |
80e16738 | 95 | (cond (pos |
eb0d9f08 RS |
96 | (if (= dir -1) |
97 | ;; If matching backwards, highlight the closeparen | |
98 | ;; before point as well as its matching open. | |
99 | (progn | |
100 | (if show-paren-overlay-1 | |
776b7d5a RS |
101 | (move-overlay show-paren-overlay-1 |
102 | (+ (point) dir) (point) | |
103 | (current-buffer)) | |
eb0d9f08 | 104 | (setq show-paren-overlay-1 |
329ff3a4 RS |
105 | (make-overlay (- pos dir) pos))) |
106 | ;; Always set the overlay face, since it varies. | |
107 | (overlay-put show-paren-overlay-1 'face face)) | |
eb0d9f08 RS |
108 | ;; Otherwise, turn off any such highlighting. |
109 | (and show-paren-overlay-1 | |
110 | (overlay-buffer show-paren-overlay-1) | |
111 | (delete-overlay show-paren-overlay-1))) | |
112 | ;; Turn on highlighting for the matching paren. | |
80e16738 | 113 | (if show-paren-overlay |
776b7d5a RS |
114 | (move-overlay show-paren-overlay (- pos dir) pos |
115 | (current-buffer)) | |
80e16738 | 116 | (setq show-paren-overlay |
329ff3a4 RS |
117 | (make-overlay (- pos dir) pos))) |
118 | ;; Always set the overlay face, since it varies. | |
119 | (overlay-put show-paren-overlay 'face face)) | |
80e16738 | 120 | (t |
eb0d9f08 RS |
121 | ;; If not at a paren that has a match, |
122 | ;; turn off any previous paren highlighting. | |
80e16738 | 123 | (and show-paren-overlay (overlay-buffer show-paren-overlay) |
eb0d9f08 RS |
124 | (delete-overlay show-paren-overlay)) |
125 | (and show-paren-overlay-1 (overlay-buffer show-paren-overlay-1) | |
126 | (delete-overlay show-paren-overlay-1))))))) | |
5e28918b | 127 | |
eb0d9f08 RS |
128 | (if window-system |
129 | (progn | |
130 | (setq blink-paren-function nil) | |
131 | (add-hook 'post-command-hook 'show-paren-command-hook))) | |
520bca57 RS |
132 | ;;; This is in case paren.el is preloaded. |
133 | (add-hook 'window-setup-hook | |
134 | (function (lambda () | |
135 | (if window-system | |
136 | (progn | |
137 | (setq blink-paren-function nil) | |
138 | (add-hook 'post-command-hook | |
139 | 'show-paren-command-hook)))))) | |
3a3236d2 JB |
140 | (provide 'paren) |
141 | ||
142 | ;;; paren.el ends here |