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55535639 | 1 | ;;; paren.el --- highlight matching paren |
b578f267 | 2 | |
05e122fe | 3 | ;; Copyright (C) 1993, 1996, 2001 Free Software Foundation, Inc. |
5e28918b | 4 | |
5762abec | 5 | ;; Author: rms@gnu.org |
e4c37df7 JB |
6 | ;; Maintainer: FSF |
7 | ;; Keywords: languages, faces | |
5e2325c9 | 8 | |
5e28918b JB |
9 | ;; This file is part of GNU Emacs. |
10 | ||
11 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
12 | ;; it under the terms of the GNU General Public License as published by | |
13 | ;; the Free Software Foundation; either version 2, or (at your option) | |
14 | ;; any later version. | |
15 | ||
16 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
17 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | ;; GNU General Public License for more details. | |
20 | ||
21 | ;; You should have received a copy of the GNU General Public License | |
b578f267 EN |
22 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
23 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
24 | ;; Boston, MA 02111-1307, USA. | |
5e28918b JB |
25 | |
26 | ;;; Commentary: | |
27 | ||
ca5b46fc EZ |
28 | ;; Put this into your ~/.emacs: |
29 | ||
30 | ;; (show-paren-mode t) | |
31 | ||
32 | ;; It will display highlighting on whatever paren matches the one | |
33 | ;; before or after point. | |
5e28918b JB |
34 | |
35 | ;;; Code: | |
36 | ||
173f2341 SM |
37 | (defgroup paren-showing nil |
38 | "Showing (un)matching of parens and expressions." | |
39 | :prefix "show-paren-" | |
40 | :group 'paren-matching) | |
41 | ||
eb0d9f08 | 42 | ;; This is the overlay used to highlight the matching paren. |
d1475aa1 | 43 | (defvar show-paren-overlay nil) |
673cc3c5 | 44 | ;; This is the overlay used to highlight the closeparen right before point. |
eb0d9f08 RS |
45 | (defvar show-paren-overlay-1 nil) |
46 | ||
173f2341 SM |
47 | (defcustom show-paren-style 'parenthesis |
48 | "*Style used when showing a matching paren. | |
49 | Valid styles are `parenthesis' (meaning show the matching paren), | |
50 | `expression' (meaning show the entire expression enclosed by the paren) and | |
51 | `mixed' (meaning show the matching paren if it is visible, and the expression | |
52 | otherwise)." | |
53 | :type '(choice (const parenthesis) (const expression) (const mixed)) | |
54 | :group 'paren-showing) | |
55 | ||
56 | (defcustom show-paren-delay | |
57 | (if (featurep 'lisp-float-type) (/ (float 1) (float 8)) 1) | |
58 | "*Time in seconds to delay before showing a matching paren." | |
59 | :type '(number :tag "seconds") | |
60 | :group 'paren-showing) | |
61 | ||
5780586e GM |
62 | (defcustom show-paren-priority 1000 |
63 | "*Priority of paren highlighting overlays." | |
64 | :type 'integer | |
65 | :group 'paren-showing | |
66 | :version "21.1") | |
f1180544 | 67 | |
2fe66dda RS |
68 | (defcustom show-paren-ring-bell-on-mismatch nil |
69 | "*If non-nil, beep if mismatched paren is detected." | |
70 | :type 'boolean | |
71 | :group 'paren-showing | |
72 | :version "20.3") | |
f1180544 | 73 | |
173f2341 | 74 | (defface show-paren-match-face |
05e122fe MB |
75 | '((((class color) (background light)) |
76 | :background "turquoise") ; looks OK on tty (becomes cyan) | |
77 | (((class color) (background dark)) | |
78 | :background "steelblue3") ; looks OK on tty (becomes blue) | |
79 | (((background dark)) | |
80 | :background "grey50") | |
81 | (t | |
82 | :background "gray")) | |
173f2341 SM |
83 | "Show Paren mode face used for a matching paren." |
84 | :group 'faces | |
85 | :group 'paren-showing) | |
86 | ||
87 | (defface show-paren-mismatch-face | |
88 | '((((class color)) (:foreground "white" :background "purple")) | |
2e8f6012 | 89 | (t (:inverse-video t))) |
173f2341 SM |
90 | "Show Paren mode face used for a mismatching paren." |
91 | :group 'faces | |
92 | :group 'paren-showing) | |
30322a27 | 93 | |
12eb8433 RS |
94 | (defvar show-paren-idle-timer nil) |
95 | ||
96 | ;;;###autoload | |
2b497eda | 97 | (define-minor-mode show-paren-mode |
12eb8433 RS |
98 | "Toggle Show Paren mode. |
99 | With prefix ARG, turn Show Paren mode on if and only if ARG is positive. | |
100 | Returns the new status of Show Paren mode (non-nil means on). | |
101 | ||
102 | When Show Paren mode is enabled, any matching parenthesis is highlighted | |
103 | in `show-paren-style' after `show-paren-delay' seconds of Emacs idle time." | |
83bfc0d9 | 104 | :global t :group 'paren-showing |
050d5fc2 KH |
105 | ;; Turn off the usual paren-matching method |
106 | ;; when this one is turned on. | |
107 | (if (local-variable-p 'show-paren-mode) | |
108 | (make-local-variable 'blink-matching-paren-on-screen) | |
109 | (kill-local-variable 'blink-matching-paren-on-screen)) | |
2b497eda | 110 | (setq blink-matching-paren-on-screen (not show-paren-mode)) |
050d5fc2 KH |
111 | |
112 | ;; Now enable or disable the mechanism. | |
113 | ;; First get rid of the old idle timer. | |
114 | (if show-paren-idle-timer | |
12eb8433 | 115 | (cancel-timer show-paren-idle-timer)) |
050d5fc2 KH |
116 | (setq show-paren-idle-timer nil) |
117 | ;; If show-paren-mode is enabled in some buffer now, | |
118 | ;; set up a new timer. | |
119 | (when (memq t (mapcar (lambda (buffer) | |
120 | (with-current-buffer buffer | |
121 | show-paren-mode)) | |
122 | (buffer-list))) | |
123 | (setq show-paren-idle-timer (run-with-idle-timer | |
124 | show-paren-delay t | |
125 | 'show-paren-function))) | |
2b497eda | 126 | (unless show-paren-mode |
050d5fc2 KH |
127 | (and show-paren-overlay |
128 | (eq (overlay-buffer show-paren-overlay) (current-buffer)) | |
129 | (delete-overlay show-paren-overlay)) | |
130 | (and show-paren-overlay-1 | |
131 | (eq (overlay-buffer show-paren-overlay-1) (current-buffer)) | |
2b497eda | 132 | (delete-overlay show-paren-overlay-1)))) |
12eb8433 | 133 | |
d1475aa1 JB |
134 | ;; Find the place to show, if there is one, |
135 | ;; and show it until input arrives. | |
673cc3c5 | 136 | (defun show-paren-function () |
050d5fc2 | 137 | (if show-paren-mode |
9fe9d55a SM |
138 | (let ((oldpos (point)) |
139 | (dir (cond ((eq (car (syntax-after (1- (point)))) 5) -1) | |
140 | ((eq (car (syntax-after (point))) 4) 1))) | |
141 | pos mismatch face) | |
173f2341 | 142 | ;; |
050d5fc2 KH |
143 | ;; Find the other end of the sexp. |
144 | (when dir | |
145 | (save-excursion | |
146 | (save-restriction | |
147 | ;; Determine the range within which to look for a match. | |
148 | (when blink-matching-paren-distance | |
149 | (narrow-to-region | |
150 | (max (point-min) (- (point) blink-matching-paren-distance)) | |
151 | (min (point-max) (+ (point) blink-matching-paren-distance)))) | |
152 | ;; Scan across one sexp within that range. | |
153 | ;; Errors or nil mean there is a mismatch. | |
154 | (condition-case () | |
155 | (setq pos (scan-sexps (point) dir)) | |
156 | (error (setq pos t mismatch t))) | |
6be7b127 RS |
157 | ;; Move back the other way and verify we get back to the |
158 | ;; starting point. If not, these two parens don't really match. | |
159 | ;; Maybe the one at point is escaped and doesn't really count. | |
160 | (when (integerp pos) | |
161 | (unless (condition-case () | |
162 | (eq (point) (scan-sexps pos (- dir))) | |
163 | (error nil)) | |
164 | (setq pos nil))) | |
050d5fc2 KH |
165 | ;; If found a "matching" paren, see if it is the right |
166 | ;; kind of paren to match the one we started at. | |
167 | (when (integerp pos) | |
168 | (let ((beg (min pos oldpos)) (end (max pos oldpos))) | |
169 | (when (/= (char-syntax (char-after beg)) ?\$) | |
170 | (setq mismatch | |
171 | (not (eq (char-before end) | |
172 | ;; This can give nil. | |
173 | (matching-paren (char-after beg))))))))))) | |
173f2341 | 174 | ;; |
050d5fc2 KH |
175 | ;; Highlight the other end of the sexp, or unhighlight if none. |
176 | (if (not pos) | |
177 | (progn | |
178 | ;; If not at a paren that has a match, | |
179 | ;; turn off any previous paren highlighting. | |
180 | (and show-paren-overlay (overlay-buffer show-paren-overlay) | |
181 | (delete-overlay show-paren-overlay)) | |
182 | (and show-paren-overlay-1 (overlay-buffer show-paren-overlay-1) | |
183 | (delete-overlay show-paren-overlay-1))) | |
184 | ;; | |
185 | ;; Use the correct face. | |
186 | (if mismatch | |
187 | (progn | |
188 | (if show-paren-ring-bell-on-mismatch | |
189 | (beep)) | |
190 | (setq face 'show-paren-mismatch-face)) | |
191 | (setq face 'show-paren-match-face)) | |
192 | ;; | |
193 | ;; If matching backwards, highlight the closeparen | |
194 | ;; before point as well as its matching open. | |
195 | ;; If matching forward, and the openparen is unbalanced, | |
196 | ;; highlight the paren at point to indicate misbalance. | |
197 | ;; Otherwise, turn off any such highlighting. | |
198 | (if (and (= dir 1) (integerp pos)) | |
199 | (when (and show-paren-overlay-1 | |
200 | (overlay-buffer show-paren-overlay-1)) | |
201 | (delete-overlay show-paren-overlay-1)) | |
202 | (let ((from (if (= dir 1) | |
203 | (point) | |
204 | (forward-point -1))) | |
205 | (to (if (= dir 1) | |
206 | (forward-point 1) | |
207 | (point)))) | |
208 | (if show-paren-overlay-1 | |
209 | (move-overlay show-paren-overlay-1 from to (current-buffer)) | |
210 | (setq show-paren-overlay-1 (make-overlay from to))) | |
211 | ;; Always set the overlay face, since it varies. | |
5780586e | 212 | (overlay-put show-paren-overlay-1 'priority show-paren-priority) |
050d5fc2 KH |
213 | (overlay-put show-paren-overlay-1 'face face))) |
214 | ;; | |
215 | ;; Turn on highlighting for the matching paren, if found. | |
216 | ;; If it's an unmatched paren, turn off any such highlighting. | |
217 | (unless (integerp pos) | |
218 | (delete-overlay show-paren-overlay)) | |
219 | (let ((to (if (or (eq show-paren-style 'expression) | |
173f2341 SM |
220 | (and (eq show-paren-style 'mixed) |
221 | (not (pos-visible-in-window-p pos)))) | |
050d5fc2 KH |
222 | (point) |
223 | pos)) | |
224 | (from (if (or (eq show-paren-style 'expression) | |
225 | (and (eq show-paren-style 'mixed) | |
226 | (not (pos-visible-in-window-p pos)))) | |
227 | pos | |
228 | (save-excursion | |
229 | (goto-char pos) | |
230 | (forward-point (- dir)))))) | |
231 | (if show-paren-overlay | |
232 | (move-overlay show-paren-overlay from to (current-buffer)) | |
233 | (setq show-paren-overlay (make-overlay from to)))) | |
234 | ;; | |
235 | ;; Always set the overlay face, since it varies. | |
5780586e | 236 | (overlay-put show-paren-overlay 'priority show-paren-priority) |
050d5fc2 KH |
237 | (overlay-put show-paren-overlay 'face face))) |
238 | ;; show-paren-mode is nil in this buffer. | |
239 | (and show-paren-overlay | |
240 | (delete-overlay show-paren-overlay)) | |
241 | (and show-paren-overlay-1 | |
242 | (delete-overlay show-paren-overlay-1)))) | |
5e28918b | 243 | |
3a3236d2 JB |
244 | (provide 'paren) |
245 | ||
246 | ;;; paren.el ends here |