mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-05 08:53:45 +00:00
259 lines
9.1 KiB
EmacsLisp
259 lines
9.1 KiB
EmacsLisp
;;; paren.el --- highlight matching paren
|
|
|
|
;; Copyright (C) 1993, 1996, 2001, 2002, 2003, 2004,
|
|
;; 2005 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 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, 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")
|
|
|
|
(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 'faces
|
|
:group 'paren-showing)
|
|
;; 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 'faces
|
|
:group 'paren-showing)
|
|
;; 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
|
|
;; Turn off the usual paren-matching method
|
|
;; when this one is turned on.
|
|
(if (local-variable-p 'show-paren-mode)
|
|
(make-local-variable 'blink-matching-paren-on-screen)
|
|
(kill-local-variable 'blink-matching-paren-on-screen))
|
|
(setq blink-matching-paren-on-screen (not show-paren-mode))
|
|
|
|
;; Now 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)))))))))))))
|
|
;;
|
|
;; 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)))
|
|
;; 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))))
|
|
;;
|
|
;; 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
|