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;;; paren.el --- highlight matching paren
;; Copyright (C) 1993, 1996, 2001, 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., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, 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
|
