Update years in copyright notice; nfc.

[bpt/emacs.git] / lisp / paren.el

diff --git a/lisp/paren.el b/lisp/paren.el
index bb574f7..2950617 100644 (file)
--- a/lisp/paren.el
+++ b/lisp/paren.el
@@ -1,6 +1,7 @@
 ;;; paren.el --- highlight matching paren
 
-;; Copyright (C) 1993, 1996, 2001 Free Software Foundation, Inc.
+;; Copyright (C) 1993, 1996, 2001, 2002, 2003, 2004,
+;;   2005, 2006 Free Software Foundation, Inc.
 
 ;; Author: rms@gnu.org
 ;; Maintainer: FSF
@@ -20,8 +21,8 @@
 
 ;; 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.
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
 
 ;;; Commentary:
 
@@ -64,14 +65,20 @@ otherwise)."
   :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-face
+
+(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))
@@ -81,15 +88,20 @@ otherwise)."
     (t
      :background "gray"))
   "Show Paren mode face used for a matching paren."
-  :group 'faces
-  :group 'paren-showing)
+  :group 'paren-showing-faces)
+;; backward-compatibility alias
+(put 'show-paren-match-face 'face-alias 'show-paren-match)
 
-(defface show-paren-mismatch-face
+(defface show-paren-mismatch
   '((((class color)) (:foreground "white" :background "purple"))
-    (t (:reverse-video t)))
+    (t (:inverse-video t)))
   "Show Paren mode face used for a mismatching paren."
-  :group 'faces
-  :group 'paren-showing)
+  :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)
 
@@ -102,14 +114,7 @@ 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.
+    ;; Enable or disable the mechanism.
     ;; First get rid of the old idle timer.
     (if show-paren-idle-timer
        (cancel-timer show-paren-idle-timer))
@@ -136,8 +141,8 @@ in `show-paren-style' after `show-paren-delay' seconds of Emacs idle time."
 (defun show-paren-function ()
   (if show-paren-mode
       (let ((oldpos (point))
-           (dir (cond ((eq (car (syntax-after (1- (point)))) 5) -1)
-                      ((eq (car (syntax-after (point))) 4) 1)))
+           (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.
@@ -166,11 +171,19 @@ in `show-paren-style' after `show-paren-delay' seconds of Emacs idle time."
              ;; kind of paren to match the one we started at.
              (when (integerp pos)
                (let ((beg (min pos oldpos)) (end (max pos oldpos)))
-                 (when (/= (char-syntax (char-after beg)) ?\$)
+                 (unless (eq (syntax-class (syntax-after beg)) 8)
                    (setq mismatch
-                         (not (eq (char-before end)
-                                  ;; This can give nil.
-                                  (matching-paren (char-after beg)))))))))))
+                         (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)
@@ -187,15 +200,15 @@ in `show-paren-style' after `show-paren-delay' seconds of Emacs idle time."
              (progn
                (if show-paren-ring-bell-on-mismatch
                    (beep))
-               (setq face 'show-paren-mismatch-face))
-           (setq face 'show-paren-match-face))
+               (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 (= dir 1) (integerp pos))
+         (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))
@@ -243,4 +256,5 @@ in `show-paren-style' after `show-paren-delay' seconds of Emacs idle time."
 
 (provide 'paren)
 
+;; arch-tag: d0969b88-7ac0-4bd0-bd53-e73b892b86a9
 ;;; paren.el ends here