1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
|
;;; paren.el --- highlight matching paren
;; Copyright (C) 1993, 1996, 2001, 2002, 2003, 2004,
;; 2005, 2006, 2007 Free Software Foundation, Inc.
;; Author: rms@gnu.org
;; 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 3, 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, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;; Put this into your ~/.emacs:
;; (show-paren-mode t)
;; It will display highlighting on whatever paren matches the one
;; before or after point.
;;; Code:
(defgroup paren-showing nil
"Showing (un)matching of parens and expressions."
:prefix "show-paren-"
:group 'paren-matching)
;; 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)
(defcustom show-paren-style 'parenthesis
"*Style used when showing a matching paren.
Valid styles are `parenthesis' (meaning show the matching paren),
`expression' (meaning show the entire expression enclosed by the paren) and
`mixed' (meaning show the matching paren if it is visible, and the expression
otherwise)."
:type '(choice (const parenthesis) (const expression) (const mixed))
:group 'paren-showing)
(defcustom show-paren-delay
(if (featurep 'lisp-float-type) (/ (float 1) (float 8)) 1)
"*Time in seconds to delay before showing a matching paren."
:type '(number :tag "seconds")
:group 'paren-showing)
(defcustom show-paren-priority 1000
"*Priority of paren highlighting overlays."
:type 'integer
:group 'paren-showing
:version "21.1")
(defcustom show-paren-ring-bell-on-mismatch nil
"*If non-nil, beep if mismatched paren is detected."
:type 'boolean
:group 'paren-showing
:version "20.3")
(defgroup paren-showing-faces nil
"Group for faces of Show Paren mode."
:group 'paren-showing
:group 'faces
:version "22.1")
(defface show-paren-match
'((((class color) (background light))
:background "turquoise") ; looks OK on tty (becomes cyan)
(((class color) (background dark))
:background "steelblue3") ; looks OK on tty (becomes blue)
(((background dark))
:background "grey50")
(t
:background "gray"))
"Show Paren mode face used for a matching paren."
:group 'paren-showing-faces)
;; backward-compatibility alias
(put 'show-paren-match-face 'face-alias 'show-paren-match)
(defface show-paren-mismatch
'((((class color)) (:foreground "white" :background "purple"))
(t (:inverse-video t)))
"Show Paren mode face used for a mismatching paren."
:group 'paren-showing-faces)
;; backward-compatibility alias
(put 'show-paren-mismatch-face 'face-alias 'show-paren-mismatch)
(defvar show-paren-highlight-openparen t
"*Non-nil turns on openparen highlighting when matching forward.")
(defvar show-paren-idle-timer nil)
;;;###autoload
(define-minor-mode show-paren-mode
"Toggle Show Paren mode.
With prefix ARG, turn Show Paren mode on if and only if ARG is positive.
Returns the new status of Show Paren mode (non-nil means on).
When Show Paren mode is enabled, any matching parenthesis is highlighted
in `show-paren-style' after `show-paren-delay' seconds of Emacs idle time."
:global t :group 'paren-showing
;; Enable or disable the mechanism.
;; First get rid of the old idle timer.
(if show-paren-idle-timer
(cancel-timer show-paren-idle-timer))
(setq show-paren-idle-timer nil)
;; If show-paren-mode is enabled in some buffer now,
;; set up a new timer.
(when (memq t (mapcar (lambda (buffer)
(with-current-buffer buffer
show-paren-mode))
(buffer-list)))
(setq show-paren-idle-timer (run-with-idle-timer
show-paren-delay t
'show-paren-function)))
(unless show-paren-mode
(and show-paren-overlay
(eq (overlay-buffer show-paren-overlay) (current-buffer))
(delete-overlay show-paren-overlay))
(and show-paren-overlay-1
(eq (overlay-buffer show-paren-overlay-1) (current-buffer))
(delete-overlay show-paren-overlay-1))))
;; Find the place to show, if there is one,
;; and show it until input arrives.
(defun show-paren-function ()
(if show-paren-mode
(let ((oldpos (point))
(dir (cond ((eq (syntax-class (syntax-after (1- (point)))) 5) -1)
((eq (syntax-class (syntax-after (point))) 4) 1)))
pos mismatch face)
;;
;; Find the other end of the sexp.
(when dir
(save-excursion
(save-restriction
;; Determine the range within which to look for a match.
(when 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.
;; Errors or nil mean there is a mismatch.
(condition-case ()
(setq pos (scan-sexps (point) dir))
(error (setq pos t mismatch t)))
;; Move back the other way and verify we get back to the
;; starting point. If not, these two parens don't really match.
;; Maybe the one at point is escaped and doesn't really count.
(when (integerp pos)
(unless (condition-case ()
(eq (point) (scan-sexps pos (- dir)))
(error nil))
(setq pos nil)))
;; If found a "matching" paren, see if it is the right
;; kind of paren to match the one we started at.
(when (integerp pos)
(let ((beg (min pos oldpos)) (end (max pos oldpos)))
(unless (eq (syntax-class (syntax-after beg)) 8)
(setq mismatch
(not (or (eq (char-before end)
;; This can give nil.
(cdr (syntax-after beg)))
(eq (char-after beg)
;; This can give nil.
(cdr (syntax-after (1- end))))
;; The cdr might hold a new paren-class
;; info rather than a matching-char info,
;; in which case the two CDRs should match.
(eq (cdr (syntax-after (1- end)))
(cdr (syntax-after beg))))))))))))
;;
;; Highlight the other end of the sexp, or unhighlight if none.
(if (not pos)
(progn
;; 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)))
;;
;; Use the correct face.
(if mismatch
(progn
(if show-paren-ring-bell-on-mismatch
(beep))
(setq face 'show-paren-mismatch))
(setq face 'show-paren-match))
;;
;; If matching backwards, highlight the closeparen
;; before point as well as its matching open.
;; If matching forward, and the openparen is unbalanced,
;; highlight the paren at point to indicate misbalance.
;; Otherwise, turn off any such highlighting.
(if (and (not show-paren-highlight-openparen) (= dir 1) (integerp pos))
(when (and show-paren-overlay-1
(overlay-buffer show-paren-overlay-1))
(delete-overlay show-paren-overlay-1))
(let ((from (if (= dir 1)
(point)
(forward-point -1)))
(to (if (= dir 1)
(forward-point 1)
(point))))
(if show-paren-overlay-1
(move-overlay show-paren-overlay-1 from to (current-buffer))
(setq show-paren-overlay-1 (make-overlay from to nil t)))
;; Always set the overlay face, since it varies.
(overlay-put show-paren-overlay-1 'priority show-paren-priority)
(overlay-put show-paren-overlay-1 'face face)))
;;
;; Turn on highlighting for the matching paren, if found.
;; If it's an unmatched paren, turn off any such highlighting.
(unless (integerp pos)
(delete-overlay show-paren-overlay))
(let ((to (if (or (eq show-paren-style 'expression)
(and (eq show-paren-style 'mixed)
(not (pos-visible-in-window-p pos))))
(point)
pos))
(from (if (or (eq show-paren-style 'expression)
(and (eq show-paren-style 'mixed)
(not (pos-visible-in-window-p pos))))
pos
(save-excursion
(goto-char pos)
(forward-point (- dir))))))
(if show-paren-overlay
(move-overlay show-paren-overlay from to (current-buffer))
(setq show-paren-overlay (make-overlay from to nil t))))
;;
;; Always set the overlay face, since it varies.
(overlay-put show-paren-overlay 'priority show-paren-priority)
(overlay-put show-paren-overlay 'face face)))
;; show-paren-mode is nil in this buffer.
(and show-paren-overlay
(delete-overlay show-paren-overlay))
(and show-paren-overlay-1
(delete-overlay show-paren-overlay-1))))
(provide 'paren)
;; arch-tag: d0969b88-7ac0-4bd0-bd53-e73b892b86a9
;;; paren.el ends here
|
