;;; lilypond-indent.el --- Auto-indentation for lilypond code
;;;
+;;; Heikki Junes <hjunes@cc.hut.fi>
+;;; * redefine Emacs' show-paren-function and XEmacs' paren-highlight
+;;; * match two-char slurs '\( ... \)' and '\[ ... \]' separately.
+;;; * adopt Emacs' f90-comment-region
+
;;; Chris Jackson <chris@fluffhouse.org.uk>
;;; some code is taken from ESS (Emacs Speaks Statistics) S-mode by A.J.Rossini <rossini@biostat.washington.edu>
;;; Variables for customising indentation style
+;;; TODO:
+;;; * currently, in bracket matching one may need a non-bracket
+;;; chararacter between the bracket characters, like ( ( ) )
+;;; * in syntax-highlighting slurs are not always highlighted the right way
+;;; e.g. opening slurs are found found better in "#( ( ) ( ) )" than
+;;; opening slurs
+;;; * is locality of show-paren-function and paren-highlight possible?
+
(defcustom LilyPond-indent-level 4
"*Indentation of lilypond statements with respect to containing block.")
Compares with other text in same context.")
(defcustom LilyPond-angle-offset 0
- "*Extra indentation for open angled brackets .
+ "*Extra indentation for open angled brackets.
+Compares with other text in same context.")
+
+(defcustom LilyPond-square-offset 0
+ "*Extra indentation for open square brackets.
Compares with other text in same context.")
(defcustom LilyPond-scheme-paren-offset 0
- "*Extra indentation for open scheme parens .
+ "*Extra indentation for open scheme parens.
Compares with other text in same context.")
(defcustom LilyPond-close-brace-offset 0
(defcustom LilyPond-close-angle-offset 0
"*Extra indentation for closing angle brackets.")
+(defcustom LilyPond-close-square-offset 0
+ "*Extra indentation for closing square brackets.")
+
(defcustom LilyPond-close-scheme-paren-offset 0
"*Extra indentation for closing scheme parens.")
(defcustom LilyPond-fancy-comments t
"*Non-nil means distiguish between %, %%, and %%% for indentation.")
+(defcustom LilyPond-comment-region "%%$"
+ "*String inserted by \\[LilyPond-comment-region]\
+ at start of each line in region.")
+
+(defun LilyPond-comment-region (beg-region end-region)
+ "Comment/uncomment every line in the region.
+Insert LilyPond-comment-region at the beginning of every line in the region
+or, if already present, remove it."
+ (interactive "*r")
+ (let ((end (make-marker)))
+ (set-marker end end-region)
+ (goto-char beg-region)
+ (beginning-of-line)
+ (if (looking-at (regexp-quote LilyPond-comment-region))
+ (delete-region (point) (match-end 0))
+ (insert LilyPond-comment-region))
+ (while (and (zerop (forward-line 1))
+ (< (point) (marker-position end)))
+ (if (looking-at (regexp-quote LilyPond-comment-region))
+ (delete-region (point) (match-end 0))
+ (insert LilyPond-comment-region)))
+ (set-marker end nil)))
(defun LilyPond-calculate-indent ()
"Return appropriate indentation for current line as lilypond code.
(let ((indent-point (point))
(case-fold-search nil)
state)
- (setq containing-sexp (save-excursion (LilyPond-beginning-of-containing-sexp)))
+ (setq containing-sexp (save-excursion (LilyPond-scan-containing-sexp)))
(beginning-of-defun)
(while (< (point) indent-point)
(setq state (parse-partial-sexp (point) indent-point 0)))
LilyPond-brace-offset)
((= (following-char) ?<)
LilyPond-angle-offset)
+ ((= (following-char) ?[)
+ LilyPond-square-offset)
((= (following-char) ?\))
LilyPond-scheme-paren-offset)
(t
(current-indentation)))))))))
-
(defun LilyPond-indent-line ()
"Indent current line as lilypond code.
Return the amount the indentation changed by."
(setq indent (+ indent (- LilyPond-close-brace-offset LilyPond-indent-level))))
((= (following-char) ?>)
(setq indent (+ indent (- LilyPond-close-angle-offset LilyPond-indent-level))))
+ ((= (following-char) ?])
+ (setq indent (+ indent (- LilyPond-close-square-offset LilyPond-indent-level))))
((and (= (following-char) ?\)) (LilyPond-inside-scheme-p))
(setq indent (+ indent (- LilyPond-close-scheme-paren-offset LilyPond-indent-level))))
((= (following-char) ?{)
(setq indent (+ indent LilyPond-brace-offset)))
((= (following-char) ?<)
(setq indent (+ indent LilyPond-angle-offset)))
+ ((= (following-char) ?[)
+ (setq indent (+ indent LilyPond-square-offset)))
((and (= (following-char) ?\() (LilyPond-inside-scheme-p))
(setq indent (+ indent LilyPond-scheme-paren-offset)))
))))
(current-column)))))
-(defconst LilyPond-parens-regexp-alist
- `(("[^\\]<" . "[^ \\n\\t_^-]\\s-*>\\|[_^-]\\s-*[-^]\\s-*>")
- ;; a b c->, a b c^> and a b c_> are not close-angle-brackets, they're accents
- ;; but a b c^-> and a b c^^> are close brackets with tenuto/marcato before them
- ;; also \> and \< are hairpins
- ("{" . "}")))
-
-
-(defconst LilyPond-parens-combined-regexp
- (concat (mapconcat 'car LilyPond-parens-regexp-alist "\\|")
- "\\|"
- (mapconcat 'cdr LilyPond-parens-regexp-alist "\\|")))
+;; Key: Type of bracket (character).
+;; Value: Pair of regexps representing the corresponding open and close bracket
+;; () are treated specially (need to indent in Scheme but not in music)
-
-(defun LilyPond-beginning-of-containing-sexp ()
- "Move point to the beginning of the deepest parenthesis pair enclosing point."
- (interactive)
- (let ((level 1))
+(defconst LilyPond-parens-regexp-alist
+ `( ( ?> . ("\\([^\\]\\|^\\)<" . "\\([^ \\n\\t_^-]\\|[_^-][-^]\\|\\s-\\)\\s-*>"))
+ ;; a b c->, a b c^> and a b c_> are not close-angle-brackets, they're accents
+ ;; but a b c^-> and a b c^^> are close brackets with tenuto/marcato before them
+ ;; also \> and \< are hairpins
+ ;; duh .. a single '>', as in chords '<< ... >>', was not matched here
+ ( ?} . ("{" . "}"))
+ ;; ligatures '\[ ... \]' are skipped in the following expression
+ ( ?] . ("\\([^\\]\\([\\][\\]\\)*\\|^\\)[[]" . "\\([^\\]\\([\\][\\]\\)*\\|^\\)[]]"))
+ ( "\\]" . ("\\([^\\]\\|^\\)\\([\\][\\]\\)*[\\][[]" . "\\([^\\]\\|^\\)\\([\\][\\]\\)*[\\][]]"))
+ ( "\\)" . ("\\([^\\]\\|^\\)\\([\\][\\]\\)*[\\][(]" . "\\([^\\]\\|^\\)\\([\\][\\]\\)*[\\][)]"))
+ ))
+
+
+(defconst LilyPond-parens-alist
+ `( ( ?< . ?> )
+ ( ?{ . ?} )
+ ( ?[ . ?] )
+ ( "\\[" . "\\]" )
+ ( ?\( . ?\) )
+ ( "\\(" . "\\)" )
+ ))
+
+
+(defun LilyPond-matching-paren (bracket-type)
+ "Returns the open corresponding to the close specified by bracket-type, or vice versa"
+ (cond ( (member bracket-type (mapcar 'car LilyPond-parens-alist))
+ (cdr (assoc bracket-type LilyPond-parens-alist)) )
+ ( (member bracket-type (mapcar 'cdr LilyPond-parens-alist))
+ (car (rassoc bracket-type LilyPond-parens-alist)) )
+ nil))
+
+
+(defun LilyPond-scan-containing-sexp (&optional bracket-type slur-paren-p dir)
+ "Move point to the beginning of the deepest parenthesis pair enclosing point.
+
+If the optional argument bracket-type, a character representing a
+close bracket such as ) or }, is specified, then the parenthesis pairs
+searched are limited to this type.
+
+If the optional argument slur-paren-p is non-nil, then slur
+parentheses () are considered as matching pairs. Otherwise Scheme
+parentheses are considered to be matching pairs, but slurs are not.
+slur-paren-p defaults to nil.
+"
+;;; An user does not call this function directly, or by a key sequence.
+ ;; (interactive)
+ (let ( (level (if (not (eq dir 1)) 1 -1))
+ (regexp-alist LilyPond-parens-regexp-alist)
+ (oldpos (point))
+ (assoc-bracket-type (if (not (eq dir 1)) bracket-type (LilyPond-matching-paren bracket-type))))
+
(if (LilyPond-inside-scheme-p)
- (setq paren-regexp "(\\|)" inside-scheme t)
- (setq paren-regexp LilyPond-parens-combined-regexp inside-scheme nil))
- (while (and (> level 0)
- (re-search-backward paren-regexp nil t)
+ (setq paren-regexp "(\\|)")
+ (if slur-paren-p
+ ;; expressional slurs '\( ... \)' are not taken into account
+ (setq regexp-alist (cons '( ?\) . ("\\([^\\]\\([\\][\\]\\)*\\|^\\)(" . "\\([^\\]\\([\\][\\]\\)*\\|^\\))")) regexp-alist)))
+ (if (member assoc-bracket-type (mapcar 'car regexp-alist))
+ (progn (setq paren-regexp (cdr (assoc assoc-bracket-type regexp-alist)))
+ (setq paren-regexp (concat (car paren-regexp) "\\|" (cdr paren-regexp))))
+ (setq paren-regexp (concat (mapconcat 'car (mapcar 'cdr regexp-alist) "\\|") "\\|"
+ (mapconcat 'cdr (mapcar 'cdr regexp-alist) "\\|")))))
+ ;; match concurrent one-char opening and closing slurs
+ (if (and (eq dir 1)
+ (not (sequencep bracket-type))
+ (eq (char-syntax (char-after oldpos)) ?\()
+ (not (eq (char-after oldpos) ?<)))
+ ;; anyway do not count open slur, since already level = -1
+ (progn (forward-char 1)
+ (if (eq (following-char)
+ (LilyPond-matching-paren (char-after oldpos)))
+ ;; matching char found, go after it and set level = 0
+ (progn (forward-char 1)
+ (setq level 0)))))
+ ;; browse the code until matching slur is found, or report mismatch
+ (while (and (if (not (eq dir 1))
+ (> level 0)
+ (< level 0))
+ ;; dir tells whether to search backward or forward
+ (if (not (eq dir 1))
+ (re-search-backward paren-regexp nil t)
+ (re-search-forward paren-regexp nil t))
+ ;; note: in case of two-char bracket only latter is compared
(setq match (char-before (match-end 0))))
- (if (not (save-excursion (goto-char (match-end 0))
+;;; (message "%d" level) (sit-for 0 300)
+ (if (not (save-excursion (goto-char (match-end 0))
+ ;; skip over strings and comments
(LilyPond-inside-string-or-comment-p)))
- (if (memq match '(?} ?> ?\)))
+ (if (memq match '(?} ?> ?] ?\)))
+ ;; count closing brackets
(progn (setq level (1+ level))
+ ;; slurs may be close to each other, e.g.,
+ ;; a single '>' was not matched .. need to be corrected
+ (if (and (eq dir 1) (eq (char-after (match-end 0)) match))
+ (if (/= level 0)
+ (progn
+ (setq level (1+ level))
+ (forward-char 1))))
+;;; (message "%d %c" level match) (sit-for 0 300)
+ ;; hmm..
(if (and (= match ?>)
- (looking-at ".\\s-+>\\|\\({\\|}\\|<\\|>\\|(\\|)\\)>"))
+ (looking-at ".\\s-+>\\|\\({\\|}\\|<\\|>\\|(\\|)\\|[][]\\)>"))
(forward-char 1)))
+ ;; count opening brackets
(progn (setq level (1- level))
+;;; (message "%d %c" level match) (sit-for 0 300)
+ ;; hmm..
(if (and (= match ?<)
- (looking-at ".\\s-+<\\|\\({\\|}\\|<\\|>\\|(\\|)\\)<"))
+ (looking-at ".\\s-+<\\|\\({\\|}\\|<\\|>\\|(\\|)\\|[][]\\)<"))
(forward-char 1))))))
- (if (looking-at ".<\\|.>") (forward-char 1))
- (if (/= level 1)
+ ;; jump to the matching slur
+ (if (not (eq dir 1))
+ (progn
+ (if (sequencep bracket-type)
+ ;; match the latter char in two-char brackets
+ (if (looking-at "..[][)(]") (forward-char 1)))
+ ;; if the following char is not already a slur
+ (if (and (not (looking-at "[)(]"))
+ ;; match the slur which follows
+ (looking-at ".[][><)(]")) (forward-char 1)))
+ (backward-char 1))
+ (if (= level 0)
(point)
- nil)))
+ (progn (goto-char oldpos)
+ nil))))
(defun LilyPond-inside-scheme-p ()
"Tests if point is inside embedded Scheme code"
- (interactive)
+;;; An user does not call this function directly, or by a key sequence.
+ ;; (interactive)
(let ( (test-point (point))
(level 0) )
(save-excursion
- (if (or (and (= (char-after (point)) ?\()
+ (if (or (and (/= (point) (point-max))
+ (= (char-after (point)) ?\()
(or (= (char-after (- (point) 1)) ?#)
(and (= (char-after (- (point) 2)) ?#)
(= (char-after (- (point) 1)) ?`))))
(> level 0))))
t
nil))))
+
+
+;;; Largely taken from the 'blink-matching-open' in lisp/simple.el in
+;;; the Emacs distribution.
+
+(defun LilyPond-blink-matching-paren (&optional dir)
+ "Move cursor momentarily to the beginning of the sexp before
+point. In lilypond files this is used for closing ), ], } and >, whereas the
+builtin 'blink-matching-open' is not used. In syntax table, see
+`lilypond-font-lock.el', all brackets are punctuation characters."
+;;; An user does not call this function directly, or by a key sequence.
+ ;; (interactive)
+ (let ( (oldpos (point))
+ (level 0)
+ (mismatch) )
+ (if (not (or (equal this-command 'LilyPond-electric-close-paren)
+ (eq dir 1)))
+ (goto-char (setq oldpos (- oldpos 1))))
+ ;; Test if a ligature \] or expressional slur \) was encountered
+ (setq bracket-type (char-after (point)))
+ (setq char-before-bracket-type nil)
+ (if (memq bracket-type '(?] ?\) ?[ ?\())
+ (progn
+ (setq np -1)
+ (while (eq (char-before (- (point) (setq np (+ np 1)))) ?\\)
+ (setq char-before-bracket-type (if char-before-bracket-type nil ?\\)))
+ (if (eq char-before-bracket-type ?\\)
+ (setq bracket-type (string char-before-bracket-type bracket-type)))))
+ (when blink-matching-paren-distance
+ (narrow-to-region
+ (max (point-min) (- (point) blink-matching-paren-distance))
+ (min (point-max) (+ (point) blink-matching-paren-distance))))
+ (if (and (equal this-command 'LilyPond-electric-close-paren)
+ (memq bracket-type '(?> ?} ?< ?{)))
+ ;; < { need to be mutually balanced and nested, so search backwards for both of these bracket types
+ (LilyPond-scan-containing-sexp nil nil dir)
+ ;; whereas ( ) slurs within music don't, so only need to search for ( )
+ ;; use same mechanism for [ ] slurs
+ (LilyPond-scan-containing-sexp bracket-type t dir))
+ (setq blinkpos (point))
+ (setq mismatch
+ (or (null (LilyPond-matching-paren (char-after blinkpos)))
+ (/= (char-after oldpos)
+ (LilyPond-matching-paren (char-after blinkpos)))))
+ (if mismatch (progn (setq blinkpos nil)
+ (message "Mismatched parentheses")))
+ (if (and blinkpos
+ (equal this-command 'LilyPond-electric-close-paren))
+ (if (pos-visible-in-window-p)
+ (and blink-matching-paren-on-screen
+ (sit-for blink-matching-delay))
+ (message
+ "Matches %s"
+ ;; Show what precedes the open in its line, if anything.
+ (if (save-excursion
+ (skip-chars-backward " \t")
+ (not (bolp)))
+ (buffer-substring (progn (beginning-of-line) (point))
+ (1+ blinkpos))
+ ;; Show what follows the open in its line, if anything.
+ (if (save-excursion
+ (forward-char 1)
+ (skip-chars-forward " \t")
+ (not (eolp)))
+ (buffer-substring blinkpos
+ (progn (end-of-line) (point)))
+ ;; Otherwise show the previous nonblank line,
+ ;; if there is one.
+ (if (save-excursion
+ (skip-chars-backward "\n \t")
+ (not (bobp)))
+ (concat
+ (buffer-substring (progn
+ (skip-chars-backward "\n \t")
+ (beginning-of-line)
+ (point))
+ (progn (end-of-line)
+ (skip-chars-backward " \t")
+ (point)))
+ ;; Replace the newline and other whitespace with `...'.
+ "..."
+ (buffer-substring blinkpos (1+ blinkpos)))
+ ;; There is nothing to show except the char itself.
+ (buffer-substring blinkpos (1+ blinkpos))))))))
+ (if (not (equal this-command 'LilyPond-electric-close-paren))
+ (goto-char (setq oldpos (+ oldpos 1)))
+ (goto-char oldpos))
+ (if (not (eq dir 1))
+ blinkpos
+ (+ blinkpos 1))))
+
+
+(defun LilyPond-electric-close-paren ()
+ "Blink on the matching open paren when a >, ), } or ] is inserted"
+ (interactive)
+ (let ((oldpos (point)))
+ (self-insert-command 1)
+ ;; Refontify buffer if a block-comment-ender '%}' is inserted
+ (if (and (eq (char-before (point)) ?})
+ (eq (char-before (- (point) 1)) ?%))
+ (font-lock-fontify-buffer)
+ ;; Match paren if the cursor is not inside string or comment.
+ (if (and blink-matching-paren
+ (not (LilyPond-inside-string-or-comment-p))
+ (save-excursion (re-search-backward
+ (concat (mapconcat 'cdr (mapcar 'cdr LilyPond-parens-regexp-alist) "\\|") "\\|)") nil t)
+ (eq oldpos (1- (match-end 0)))))
+ (progn (backward-char 1)
+ (LilyPond-blink-matching-paren)
+ (forward-char 1))))))
+
+(defun LilyPond-scan-sexps (pos dir)
+ "This function is redefined to be used in Emacs' show-paren-function and
+in XEmacs' paren-highlight."
+ (LilyPond-blink-matching-paren dir))
+
+;;; REDEFINITIONS: in future make show-paren-mode and paren-highlight local?
+
+;;; From Emacs' paren.el, with minimal changes (see "LilyPond"-lines)
+;; Find the place to show, if there is one,
+;; and show it until input arrives.
+; (defun show-paren-function ()
+
+
+;; don't redefine emacs functions. It breaks other modes.
+
+(defun LilyPond-show-paren-function () ; make show-paren-function local ??
+ (if show-paren-mode
+ (let (pos dir mismatch face (oldpos (point)))
+ (cond ((eq (char-syntax (preceding-char)) ?\))
+ (setq dir -1))
+ ((eq (char-syntax (following-char)) ?\()
+ (setq dir 1)))
+ ;;
+ ;; Find the other end of the sexp.
+ (when (and dir
+ (not (LilyPond-inside-string-or-comment-p)))
+ (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 (LilyPond-scan-sexps (point) dir))
+ (error (setq pos t mismatch t)))
+ ;; 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)))
+ (when (/= (char-syntax (char-after beg)) ?\$)
+ (setq mismatch
+ (not (eq (char-before end)
+ ;; This can give nil.
+ (matching-paren (char-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-face))
+ (setq face 'show-paren-match-face))
+ ;;
+ ;; 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))
+ (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))))
+
+;;; From XEmacs' paren.el, with minimal changes (see "LilyPond"-lines)
+;; Find the place to show, if there is one,
+;; and show it until input arrives.
+(if (string-match "XEmacs\\|Lucid" emacs-version)
+ (paren-set-mode 'paren)) ; works if this is set here (, right place?)
+;(defun paren-highlight ()
+(defun LilyPond-paren-highlight () ; make paren-highlight local ??
+ "This highlights matching parentheses.
+
+See the variables:
+ paren-message-offscreen use modeline when matching paren is offscreen?
+ paren-ding-unmatched make noise when passing over mismatched parens?
+ paren-mode 'blink-paren, 'paren, or 'sexp
+ blink-matching-paren-distance maximum distance to search for parens.
+
+and the following faces:
+ paren-match, paren-mismatch, paren-blink-off"
+
+ ;; I suppose I could check here to see if a keyboard macro is executing,
+ ;; but I did a quick empirical check and couldn't tell that there was any
+ ;; difference in performance
+
+ (let ((oldpos (point))
+ (pface nil) ; face for paren...nil kills the overlay
+ (dir (and paren-mode
+ (not (input-pending-p))
+ (not executing-kbd-macro)
+ (cond ((eq (char-syntax (preceding-char)) ?\))
+ -1)
+ ((eq (char-syntax (following-char)) ?\()
+ 1))))
+ pos mismatch)
+
+ (save-excursion
+ (if (or (not dir)
+ (LilyPond-inside-string-or-comment-p)
+ (not (save-restriction
+ ;; Determine the range within which to look for a match.
+ (if 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.
+ (condition-case nil
+ (setq pos (LilyPond-scan-sexps (point) dir))
+ ;; NOTE - if blink-matching-paren-distance is set,
+ ;; then we can have spurious unmatched parens.
+ (error (paren-maybe-ding)
+ nil)))))
+
+ ;; do nothing if we didn't find a matching paren...
+ nil
+
+ ;; See if the "matching" paren is the right kind of paren
+ ;; to match the one we started at.
+ (let ((beg (min pos oldpos)) (end (max pos oldpos)))
+ (setq mismatch
+ (and (/= (char-syntax (char-after beg)) ?\\)
+ (/= (char-syntax (char-after beg)) ?\$)
+ ;; XEmacs change
+ (matching-paren (char-after beg))
+ (/= (char-after (1- end))
+ (matching-paren (char-after beg)))))
+ (if (eq paren-mode 'sexp)
+ (setq paren-extent (make-extent beg end))))
+ (and mismatch
+ (paren-maybe-ding))
+ (setq pface (if mismatch
+ 'paren-mismatch
+ 'paren-match))
+ (and (memq paren-mode '(blink-paren paren))
+ (setq paren-extent (make-extent (- pos dir) pos)))
+
+ (if (and paren-message-offscreen
+ (eq dir -1)
+ (not (current-message))
+ (not (window-minibuffer-p (selected-window)))
+ (not (pos-visible-in-window-safe pos)))
+ (paren-describe-match pos mismatch))
+
+ ;; put the right face on the extent
+ (cond (pface
+ (set-extent-face paren-extent pface)
+ (set-extent-priority paren-extent 100) ; want this to be high
+ (and (eq paren-mode 'blink-paren)
+ (setq paren-blink-on-face pface
+ paren-n-blinks 0
+ paren-timeout-id
+ (and paren-blink-interval
+ (add-timeout paren-blink-interval
+ 'paren-blink-timeout
+ nil
+ paren-blink-interval))))))
+ ))))
projects / lilypond.git / blobdiff