;;; Code:
+(defvar font-lock-maximum-size)
+(defvar font-lock-verbose)
+
;; This variable is used by mode packages that support Font Lock mode by
;; defining their own keywords to use for `font-lock-keywords'. (The mode
;; command should make it buffer-local and set it to provide the set up.)
Other variables include that for syntactic keyword fontification,
`font-lock-syntactic-keywords'
-and those for buffer-specialised fontification functions,
+and those for buffer-specialized fontification functions,
`font-lock-fontify-buffer-function', `font-lock-unfontify-buffer-function',
`font-lock-fontify-region-function', `font-lock-unfontify-region-function',
`font-lock-inhibit-thing-lock' and `font-lock-maximum-size'.")
(defvar font-lock-fontified nil) ; Whether we have fontified the buffer.
-(defvar font-lock-category-alist nil
- "An alist of (CATEGORY-SYMBOL . FACE-PROP) controlled by Font Lock.
-This variable is intended to be used by special modes which construct
-buffer text for display to the user (i.e. buffer-menu, occur), but
-wish to have fontification turned on and off by Font Lock. If this
-variable is non-nil, then calling `font-lock-mode' will simply toggle
-the symbol property `face' of CATEGORY-SYMBOL.")
+(defvar font-lock-function 'font-lock-default-function
+ "A function which is called when `font-lock-mode' is toggled.
+It will be passed one argument, which is the current value of
+`font-lock-mode'.")
+(make-variable-buffer-local 'font-lock-function)
(define-minor-mode font-lock-mode
"Toggle Font Lock mode.
See the variable `font-lock-defaults-alist' for the Font Lock mode default
settings. You can set your own default settings for some mode, by setting a
-buffer local value for `font-lock-defaults', via its mode hook."
+buffer local value for `font-lock-defaults', via its mode hook.
+
+The above is the default behavior of `font-lock-mode'; you may specify
+your own function which is called when `font-lock-mode' is toggled via
+`font-lock-function'. "
nil nil nil
;; Don't turn on Font Lock mode if we don't have a display (we're running a
;; batch job) or if the buffer is invisible (the name starts with a space).
(when (or noninteractive (eq (aref (buffer-name) 0) ?\ ))
(setq font-lock-mode nil))
-
+ (funcall font-lock-function font-lock-mode)
+ ;; Arrange to unfontify this buffer if we change major mode later.
+ (if font-lock-mode
+ (add-hook 'change-major-mode-hook 'font-lock-change-mode nil t)
+ (remove-hook 'change-major-mode-hook 'font-lock-change-mode t)))
+
+;; Get rid of fontification for the old major mode.
+;; We do this when changing major modes.
+(defun font-lock-change-mode ()
+ (font-lock-mode -1))
+
+(defun font-lock-defontify ()
+ "Clear out all `font-lock-face' properties in current buffer.
+A major mode that uses `font-lock-face' properties should put
+this function onto `change-major-mode-hook'."
+ (let ((modp (buffer-modified-p))
+ (inhibit-read-only t))
+ (save-restriction
+ (widen)
+ (remove-list-of-text-properties (point-min) (point-max)
+ '(font-lock-face)))
+ (set-buffer-modified-p modp)))
+
+(defun font-lock-default-function (mode)
;; Turn on Font Lock mode.
- (when font-lock-mode
+ (when mode
(font-lock-set-defaults)
- (dolist (elt font-lock-category-alist)
- (put (car elt) 'face (cdr elt)))
+ (set (make-local-variable 'char-property-alias-alist)
+ (copy-tree char-property-alias-alist))
+ ;; Add `font-lock-face' as an alias for the `face' property.
+ (let ((elt (assq 'face char-property-alias-alist)))
+ (if elt
+ (unless (memq 'font-lock-face (cdr elt))
+ (setcdr elt (nconc (cdr elt) (list 'font-lock-face))))
+ (push (list 'face 'font-lock-face) char-property-alias-alist)))
+ ;; Only do hard work if the mode has specified stuff in
+ ;; `font-lock-defaults'.
(when font-lock-defaults
(add-hook 'after-change-functions 'font-lock-after-change-function t t)
(font-lock-turn-on-thing-lock)
(message "Fontifying %s...buffer size greater than font-lock-maximum-size"
(buffer-name)))))))
;; Turn off Font Lock mode.
- (unless font-lock-mode
- (dolist (elt font-lock-category-alist)
- (put (car elt) 'face nil))
+ (unless mode
+ ;; Remove `font-lock-face' as an alias for the `face' property.
+ (set (make-local-variable 'char-property-alias-alist)
+ (copy-tree char-property-alias-alist))
+ (let ((elt (assq 'face char-property-alias-alist)))
+ (when elt
+ (setcdr elt (remq 'font-lock-face (cdr elt)))
+ (when (null (cdr elt))
+ (setq char-property-alias-alist (delq elt char-property-alias-alist)))))
(when font-lock-defaults
(remove-hook 'after-change-functions 'font-lock-after-change-function t)
(font-lock-unfontify-buffer)
(set (make-local-variable 'font-lock-set-defaults) t)
(make-local-variable 'font-lock-fontified)
(make-local-variable 'font-lock-multiline)
- ;; Detect if this is a simple mode, which doesn't use any
- ;; syntactic fontification functions.
- (when (or font-lock-defaults
- (assq major-mode font-lock-defaults-alist))
- (require 'font-lock)
- (font-lock-set-defaults-1))))
+ (let ((defaults (or font-lock-defaults
+ (cdr (assq major-mode font-lock-defaults-alist)))))
+ (when defaults
+ (require 'font-lock)
+ (font-lock-set-defaults-1)))))
;;; Global Font Lock mode.
;; hook is run, the major mode is in the process of being changed and we do not
;; know what the final major mode will be. So, `font-lock-change-major-mode'
;; only (a) notes the name of the current buffer, and (b) adds our function
-;; `turn-on-font-lock-if-enabled' to the hook variables `find-file-hooks' and
+;; `turn-on-font-lock-if-enabled' to the hook variables `find-file-hook' and
;; `post-command-hook' (for buffers that are not visiting files). By the time
;; the functions on the first of these hooks to be run are run, the new major
;; mode is assumed to be in place. This way we get a Font Lock function run
:group 'font-lock)
(defun turn-on-font-lock-if-enabled ()
- (when (and (or font-lock-defaults
- font-lock-category-alist
- (assq major-mode font-lock-defaults-alist))
- (or (eq font-lock-global-modes t)
- (if (eq (car-safe font-lock-global-modes) 'not)
- (not (memq major-mode (cdr font-lock-global-modes)))
- (memq major-mode font-lock-global-modes))))
+ (unless (and (eq (car-safe font-lock-global-modes) 'not)
+ (memq major-mode (cdr font-lock-global-modes)))
(let (inhibit-quit)
(turn-on-font-lock))))