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- ;;; jit-lock.el --- just-in-time fontification
- ;; Copyright (C) 1998, 2000-2012 Free Software Foundation, Inc.
- ;; Author: Gerd Moellmann <gerd@gnu.org>
- ;; Keywords: faces files
- ;; Package: emacs
- ;; 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 3 of the License, 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. If not, see <http://www.gnu.org/licenses/>.
- ;;; Commentary:
- ;; Just-in-time fontification, triggered by C redisplay code.
- ;;; Code:
- (eval-when-compile
- (require 'cl)
- (defmacro with-buffer-prepared-for-jit-lock (&rest body)
- "Execute BODY in current buffer, overriding several variables.
- Preserves the `buffer-modified-p' state of the current buffer."
- (declare (debug t))
- `(let ((inhibit-point-motion-hooks t))
- (with-silent-modifications
- ,@body))))
- ;;; Customization.
- (defgroup jit-lock nil
- "Font Lock support mode to fontify just-in-time."
- :version "21.1"
- :group 'font-lock)
- (defcustom jit-lock-chunk-size 500
- "Jit-lock fontifies chunks of at most this many characters at a time.
- This variable controls both display-time and stealth fontification."
- :type 'integer
- :group 'jit-lock)
- (defcustom jit-lock-stealth-time nil
- "Time in seconds to wait before beginning stealth fontification.
- Stealth fontification occurs if there is no input within this time.
- If nil, stealth fontification is never performed.
- The value of this variable is used when JIT Lock mode is turned on."
- :type '(choice (const :tag "never" nil)
- (number :tag "seconds" :value 16))
- :group 'jit-lock)
- (defcustom jit-lock-stealth-nice 0.5
- "Time in seconds to pause between chunks of stealth fontification.
- Each iteration of stealth fontification is separated by this amount of time,
- thus reducing the demand that stealth fontification makes on the system.
- If nil, means stealth fontification is never paused.
- To reduce machine load during stealth fontification, at the cost of stealth
- taking longer to fontify, you could increase the value of this variable.
- See also `jit-lock-stealth-load'."
- :type '(choice (const :tag "never" nil)
- (number :tag "seconds"))
- :group 'jit-lock)
- (defcustom jit-lock-stealth-load
- (if (condition-case nil (load-average) (error)) 200)
- "Load in percentage above which stealth fontification is suspended.
- Stealth fontification pauses when the system short-term load average (as
- returned by the function `load-average' if supported) goes above this level,
- thus reducing the demand that stealth fontification makes on the system.
- If nil, means stealth fontification is never suspended.
- To reduce machine load during stealth fontification, at the cost of stealth
- taking longer to fontify, you could reduce the value of this variable.
- See also `jit-lock-stealth-nice'."
- :type (if (condition-case nil (load-average) (error))
- '(choice (const :tag "never" nil)
- (integer :tag "load"))
- '(const :format "%t: unsupported\n" nil))
- :group 'jit-lock)
- (defcustom jit-lock-stealth-verbose nil
- "If non-nil, means stealth fontification should show status messages."
- :type 'boolean
- :group 'jit-lock)
- (defvaralias 'jit-lock-defer-contextually 'jit-lock-contextually)
- (defcustom jit-lock-contextually 'syntax-driven
- "If non-nil, means fontification should be syntactically true.
- If nil, means fontification occurs only on those lines modified. This
- means where modification on a line causes syntactic change on subsequent lines,
- those subsequent lines are not refontified to reflect their new context.
- If t, means fontification occurs on those lines modified and all
- subsequent lines. This means those subsequent lines are refontified to reflect
- their new syntactic context, after `jit-lock-context-time' seconds.
- If any other value, e.g., `syntax-driven', means syntactically true
- fontification occurs only if syntactic fontification is performed using the
- buffer mode's syntax table, i.e., only if `font-lock-keywords-only' is nil.
- The value of this variable is used when JIT Lock mode is turned on."
- :type '(choice (const :tag "never" nil)
- (const :tag "always" t)
- (other :tag "syntax-driven" syntax-driven))
- :group 'jit-lock)
- (defcustom jit-lock-context-time 0.5
- "Idle time after which text is contextually refontified, if applicable."
- :type '(number :tag "seconds")
- :group 'jit-lock)
- (defcustom jit-lock-defer-time nil ;; 0.25
- "Idle time after which deferred fontification should take place.
- If nil, fontification is not deferred."
- :group 'jit-lock
- :type '(choice (const :tag "never" nil)
- (number :tag "seconds")))
- ;;; Variables that are not customizable.
- (defvar jit-lock-mode nil
- "Non-nil means Just-in-time Lock mode is active.")
- (make-variable-buffer-local 'jit-lock-mode)
- (defvar jit-lock-functions nil
- "Functions to do the actual fontification.
- They are called with two arguments: the START and END of the region to fontify.")
- (make-variable-buffer-local 'jit-lock-functions)
- (defvar jit-lock-context-unfontify-pos nil
- "Consider text after this position as contextually unfontified.
- If nil, contextual fontification is disabled.")
- (make-variable-buffer-local 'jit-lock-context-unfontify-pos)
- (defvar jit-lock-stealth-timer nil
- "Timer for stealth fontification in Just-in-time Lock mode.")
- (defvar jit-lock-stealth-repeat-timer nil
- "Timer for repeated stealth fontification in Just-in-time Lock mode.")
- (defvar jit-lock-context-timer nil
- "Timer for context fontification in Just-in-time Lock mode.")
- (defvar jit-lock-defer-timer nil
- "Timer for deferred fontification in Just-in-time Lock mode.")
- (defvar jit-lock-defer-buffers nil
- "List of buffers with pending deferred fontification.")
- (defvar jit-lock-stealth-buffers nil
- "List of buffers that are being fontified stealthily.")
- ;;; JIT lock mode
- (defun jit-lock-mode (arg)
- "Toggle Just-in-time Lock mode.
- Turn Just-in-time Lock mode on if and only if ARG is non-nil.
- Enable it automatically by customizing group `font-lock'.
- When Just-in-time Lock mode is enabled, fontification is different in the
- following ways:
- - Demand-driven buffer fontification triggered by Emacs C code.
- This means initial fontification of the whole buffer does not occur.
- Instead, fontification occurs when necessary, such as when scrolling
- through the buffer would otherwise reveal unfontified areas. This is
- useful if buffer fontification is too slow for large buffers.
- - Stealthy buffer fontification if `jit-lock-stealth-time' is non-nil.
- This means remaining unfontified areas of buffers are fontified if Emacs has
- been idle for `jit-lock-stealth-time' seconds, while Emacs remains idle.
- This is useful if any buffer has any deferred fontification.
- - Deferred context fontification if `jit-lock-contextually' is
- non-nil. This means fontification updates the buffer corresponding to
- true syntactic context, after `jit-lock-context-time' seconds of Emacs
- idle time, while Emacs remains idle. Otherwise, fontification occurs
- on modified lines only, and subsequent lines can remain fontified
- corresponding to previous syntactic contexts. This is useful where
- strings or comments span lines.
- Stealth fontification only occurs while the system remains unloaded.
- If the system load rises above `jit-lock-stealth-load' percent, stealth
- fontification is suspended. Stealth fontification intensity is controlled via
- the variable `jit-lock-stealth-nice'."
- (setq jit-lock-mode arg)
- (cond (;; Turn Just-in-time Lock mode on.
- jit-lock-mode
- ;; Mark the buffer for refontification.
- (jit-lock-refontify)
- ;; Install an idle timer for stealth fontification.
- (when (and jit-lock-stealth-time (null jit-lock-stealth-timer))
- (setq jit-lock-stealth-timer
- (run-with-idle-timer jit-lock-stealth-time t
- 'jit-lock-stealth-fontify)))
- ;; Create, but do not activate, the idle timer for repeated
- ;; stealth fontification.
- (when (and jit-lock-stealth-time (null jit-lock-stealth-repeat-timer))
- (setq jit-lock-stealth-repeat-timer (timer-create))
- (timer-set-function jit-lock-stealth-repeat-timer
- 'jit-lock-stealth-fontify '(t)))
- ;; Init deferred fontification timer.
- (when (and jit-lock-defer-time (null jit-lock-defer-timer))
- (setq jit-lock-defer-timer
- (run-with-idle-timer jit-lock-defer-time t
- 'jit-lock-deferred-fontify)))
- ;; Initialize contextual fontification if requested.
- (when (eq jit-lock-contextually t)
- (unless jit-lock-context-timer
- (setq jit-lock-context-timer
- (run-with-idle-timer jit-lock-context-time t
- 'jit-lock-context-fontify)))
- (setq jit-lock-context-unfontify-pos
- (or jit-lock-context-unfontify-pos (point-max))))
- ;; Setup our hooks.
- (add-hook 'after-change-functions 'jit-lock-after-change nil t)
- (add-hook 'fontification-functions 'jit-lock-function))
- ;; Turn Just-in-time Lock mode off.
- (t
- ;; Cancel our idle timers.
- (when (and (or jit-lock-stealth-timer jit-lock-defer-timer
- jit-lock-context-timer)
- ;; Only if there's no other buffer using them.
- (not (catch 'found
- (dolist (buf (buffer-list))
- (with-current-buffer buf
- (when jit-lock-mode (throw 'found t)))))))
- (when jit-lock-stealth-timer
- (cancel-timer jit-lock-stealth-timer)
- (setq jit-lock-stealth-timer nil))
- (when jit-lock-context-timer
- (cancel-timer jit-lock-context-timer)
- (setq jit-lock-context-timer nil))
- (when jit-lock-defer-timer
- (cancel-timer jit-lock-defer-timer)
- (setq jit-lock-defer-timer nil)))
- ;; Remove hooks.
- (remove-hook 'after-change-functions 'jit-lock-after-change t)
- (remove-hook 'fontification-functions 'jit-lock-function))))
- (defun jit-lock-register (fun &optional contextual)
- "Register FUN as a fontification function to be called in this buffer.
- FUN will be called with two arguments START and END indicating the region
- that needs to be (re)fontified.
- If non-nil, CONTEXTUAL means that a contextual fontification would be useful."
- (add-hook 'jit-lock-functions fun nil t)
- (when (and contextual jit-lock-contextually)
- (set (make-local-variable 'jit-lock-contextually) t))
- (jit-lock-mode t))
- (defun jit-lock-unregister (fun)
- "Unregister FUN as a fontification function.
- Only applies to the current buffer."
- (remove-hook 'jit-lock-functions fun t)
- (unless jit-lock-functions (jit-lock-mode nil)))
- ;; This function is used to prevent font-lock-fontify-buffer from
- ;; fontifying eagerly the whole buffer. This is important for
- ;; things like CWarn mode which adds/removes a few keywords and
- ;; does a refontify (which takes ages on large files).
- (defun jit-lock-refontify (&optional beg end)
- "Force refontification of the region BEG..END (default whole buffer)."
- (with-buffer-prepared-for-jit-lock
- (save-restriction
- (widen)
- (put-text-property (or beg (point-min)) (or end (point-max))
- 'fontified nil))))
- ;;; On demand fontification.
- (defun jit-lock-function (start)
- "Fontify current buffer starting at position START.
- This function is added to `fontification-functions' when `jit-lock-mode'
- is active."
- (when (and jit-lock-mode (not memory-full))
- (if (null jit-lock-defer-timer)
- ;; No deferral.
- (jit-lock-fontify-now start (+ start jit-lock-chunk-size))
- ;; Record the buffer for later fontification.
- (unless (memq (current-buffer) jit-lock-defer-buffers)
- (push (current-buffer) jit-lock-defer-buffers))
- ;; Mark the area as defer-fontified so that the redisplay engine
- ;; is happy and so that the idle timer can find the places to fontify.
- (with-buffer-prepared-for-jit-lock
- (put-text-property start
- (next-single-property-change
- start 'fontified nil
- (min (point-max) (+ start jit-lock-chunk-size)))
- 'fontified 'defer)))))
- (defun jit-lock-fontify-now (&optional start end)
- "Fontify current buffer from START to END.
- Defaults to the whole buffer. END can be out of bounds."
- (with-buffer-prepared-for-jit-lock
- (save-excursion
- (unless start (setq start (point-min)))
- (setq end (if end (min end (point-max)) (point-max)))
- ;; This did bind `font-lock-beginning-of-syntax-function' to
- ;; nil at some point, for an unknown reason. Don't do this; it
- ;; can make highlighting slow due to expensive calls to
- ;; `parse-partial-sexp' in function
- ;; `font-lock-fontify-syntactically-region'. Example: paging
- ;; from the end of a buffer to its start, can do repeated
- ;; `parse-partial-sexp' starting from `point-min', which can
- ;; take a long time in a large buffer.
- (let ((orig-start start) next)
- (save-match-data
- ;; Fontify chunks beginning at START. The end of a
- ;; chunk is either `end', or the start of a region
- ;; before `end' that has already been fontified.
- (while (and start (< start end))
- ;; Determine the end of this chunk.
- (setq next (or (text-property-any start end 'fontified t)
- end))
- ;; Decide which range of text should be fontified.
- ;; The problem is that START and NEXT may be in the
- ;; middle of something matched by a font-lock regexp.
- ;; Until someone has a better idea, let's start
- ;; at the start of the line containing START and
- ;; stop at the start of the line following NEXT.
- (goto-char next) (setq next (line-beginning-position 2))
- (goto-char start) (setq start (line-beginning-position))
- ;; Make sure the contextual refontification doesn't re-refontify
- ;; what's already been refontified.
- (when (and jit-lock-context-unfontify-pos
- (< jit-lock-context-unfontify-pos next)
- (>= jit-lock-context-unfontify-pos start)
- ;; Don't move boundary forward if we have to
- ;; refontify previous text. Otherwise, we risk moving
- ;; it past the end of the multiline property and thus
- ;; forget about this multiline region altogether.
- (not (get-text-property start 'jit-lock-defer-multiline)))
- (setq jit-lock-context-unfontify-pos next))
- ;; Fontify the chunk, and mark it as fontified.
- ;; We mark it first, to make sure that we don't indefinitely
- ;; re-execute this fontification if an error occurs.
- (put-text-property start next 'fontified t)
- (condition-case err
- (run-hook-with-args 'jit-lock-functions start next)
- ;; If the user quits (which shouldn't happen in normal on-the-fly
- ;; jit-locking), make sure the fontification will be performed
- ;; before displaying the block again.
- (quit (put-text-property start next 'fontified nil)
- (funcall 'signal (car err) (cdr err))))
- ;; The redisplay engine has already rendered the buffer up-to
- ;; `orig-start' and won't notice if the above jit-lock-functions
- ;; changed the appearance of any part of the buffer prior
- ;; to that. So if `start' is before `orig-start', we need to
- ;; cause a new redisplay cycle after this one so that any changes
- ;; are properly reflected on screen.
- ;; To make such repeated redisplay happen less often, we can
- ;; eagerly extend the refontified region with
- ;; jit-lock-after-change-extend-region-functions.
- (when (< start orig-start)
- (run-with-timer 0 nil 'jit-lock-force-redisplay
- (current-buffer) start orig-start))
- ;; Find the start of the next chunk, if any.
- (setq start (text-property-any next end 'fontified nil))))))))
- (defun jit-lock-force-redisplay (buf start end)
- "Force the display engine to re-render buffer BUF from START to END."
- (with-current-buffer buf
- (with-buffer-prepared-for-jit-lock
- ;; Don't cause refontification (it's already been done), but just do
- ;; some random buffer change, so as to force redisplay.
- (put-text-property start end 'fontified t))))
- ;;; Stealth fontification.
- (defsubst jit-lock-stealth-chunk-start (around)
- "Return the start of the next chunk to fontify around position AROUND.
- Value is nil if there is nothing more to fontify."
- (if (zerop (buffer-size))
- nil
- (save-restriction
- (widen)
- (let* ((next (text-property-not-all around (point-max) 'fontified t))
- (prev (previous-single-property-change around 'fontified))
- (prop (get-text-property (max (point-min) (1- around))
- 'fontified))
- (start (cond
- ((null prev)
- ;; There is no property change between AROUND
- ;; and the start of the buffer. If PROP is
- ;; non-nil, everything in front of AROUND is
- ;; fontified, otherwise nothing is fontified.
- (if (eq prop t)
- nil
- (max (point-min)
- (- around (/ jit-lock-chunk-size 2)))))
- ((eq prop t)
- ;; PREV is the start of a region of fontified
- ;; text containing AROUND. Start fontifying a
- ;; chunk size before the end of the unfontified
- ;; region in front of that.
- (max (or (previous-single-property-change prev 'fontified)
- (point-min))
- (- prev jit-lock-chunk-size)))
- (t
- ;; PREV is the start of a region of unfontified
- ;; text containing AROUND. Start at PREV or
- ;; chunk size in front of AROUND, whichever is
- ;; nearer.
- (max prev (- around jit-lock-chunk-size)))))
- (result (cond ((null start) next)
- ((null next) start)
- ((< (- around start) (- next around)) start)
- (t next))))
- result))))
- (defun jit-lock-stealth-fontify (&optional repeat)
- "Fontify buffers stealthily.
- This function is called repeatedly after Emacs has become idle for
- `jit-lock-stealth-time' seconds. Optional argument REPEAT is expected
- non-nil in a repeated invocation of this function."
- ;; Cancel timer for repeated invocations.
- (unless repeat
- (cancel-timer jit-lock-stealth-repeat-timer))
- (unless (or executing-kbd-macro
- memory-full
- (window-minibuffer-p (selected-window))
- ;; For first invocation set up `jit-lock-stealth-buffers'.
- ;; In repeated invocations it's already been set up.
- (null (if repeat
- jit-lock-stealth-buffers
- (setq jit-lock-stealth-buffers (buffer-list)))))
- (let ((buffer (car jit-lock-stealth-buffers))
- (delay 0)
- minibuffer-auto-raise
- message-log-max
- start)
- (if (and jit-lock-stealth-load
- (> (car (load-average)) jit-lock-stealth-load))
- ;; Wait a little if load is too high.
- (setq delay jit-lock-stealth-time)
- (if (buffer-live-p buffer)
- (with-current-buffer buffer
- (if (and jit-lock-mode
- (setq start (jit-lock-stealth-chunk-start (point))))
- ;; Fontify one block of at most `jit-lock-chunk-size'
- ;; characters.
- (with-temp-message (if jit-lock-stealth-verbose
- (concat "JIT stealth lock "
- (buffer-name)))
- (jit-lock-fontify-now start
- (+ start jit-lock-chunk-size))
- ;; Run again after `jit-lock-stealth-nice' seconds.
- (setq delay (or jit-lock-stealth-nice 0)))
- ;; Nothing to fontify here. Remove this buffer from
- ;; `jit-lock-stealth-buffers' and run again immediately.
- (setq jit-lock-stealth-buffers (cdr jit-lock-stealth-buffers))))
- ;; Buffer is no longer live. Remove it from
- ;; `jit-lock-stealth-buffers' and run again immediately.
- (setq jit-lock-stealth-buffers (cdr jit-lock-stealth-buffers))))
- ;; Call us again.
- (when jit-lock-stealth-buffers
- (timer-set-idle-time jit-lock-stealth-repeat-timer (current-idle-time))
- (timer-inc-time jit-lock-stealth-repeat-timer delay)
- (timer-activate-when-idle jit-lock-stealth-repeat-timer t)))))
- ;;; Deferred fontification.
- (defun jit-lock-deferred-fontify ()
- "Fontify what was deferred."
- (when (and jit-lock-defer-buffers (not memory-full))
- ;; Mark the deferred regions back to `fontified = nil'
- (dolist (buffer jit-lock-defer-buffers)
- (when (buffer-live-p buffer)
- (with-current-buffer buffer
- ;; (message "Jit-Defer %s" (buffer-name))
- (with-buffer-prepared-for-jit-lock
- (let ((pos (point-min)))
- (while
- (progn
- (when (eq (get-text-property pos 'fontified) 'defer)
- (put-text-property
- pos (setq pos (next-single-property-change
- pos 'fontified nil (point-max)))
- 'fontified nil))
- (setq pos (next-single-property-change pos 'fontified)))))))))
- (setq jit-lock-defer-buffers nil)
- ;; Force fontification of the visible parts.
- (let ((jit-lock-defer-timer nil))
- ;; (message "Jit-Defer Now")
- (sit-for 0)
- ;; (message "Jit-Defer Done")
- )))
- (defun jit-lock-context-fontify ()
- "Refresh fontification to take new context into account."
- (unless memory-full
- (dolist (buffer (buffer-list))
- (with-current-buffer buffer
- (when jit-lock-context-unfontify-pos
- ;; (message "Jit-Context %s" (buffer-name))
- (save-restriction
- (widen)
- (when (and (>= jit-lock-context-unfontify-pos (point-min))
- (< jit-lock-context-unfontify-pos (point-max)))
- ;; If we're in text that matches a complex multi-line
- ;; font-lock pattern, make sure the whole text will be
- ;; redisplayed eventually.
- ;; Despite its name, we treat jit-lock-defer-multiline here
- ;; rather than in jit-lock-defer since it has to do with multiple
- ;; lines, i.e. with context.
- (when (get-text-property jit-lock-context-unfontify-pos
- 'jit-lock-defer-multiline)
- (setq jit-lock-context-unfontify-pos
- (or (previous-single-property-change
- jit-lock-context-unfontify-pos
- 'jit-lock-defer-multiline)
- (point-min))))
- (with-buffer-prepared-for-jit-lock
- ;; Force contextual refontification.
- (remove-text-properties
- jit-lock-context-unfontify-pos (point-max)
- '(fontified nil jit-lock-defer-multiline nil)))
- (setq jit-lock-context-unfontify-pos (point-max)))))))))
- (defvar jit-lock-start) (defvar jit-lock-end) ; Dynamically scoped variables.
- (defvar jit-lock-after-change-extend-region-functions nil
- "Hook that can extend the text to refontify after a change.
- This is run after every buffer change. The functions are called with
- the three arguments of `after-change-functions': START END OLD-LEN.
- The extended region to refontify is returned indirectly by modifying
- the variables `jit-lock-start' and `jit-lock-end'.
- Note that extending the region this way is not strictly necessary, except
- that the nature of the redisplay code tends to otherwise leave some of
- the rehighlighted text displayed with the old highlight until the next
- redisplay (see comment about repeated redisplay in `jit-lock-fontify-now').")
- (defun jit-lock-after-change (start end old-len)
- "Mark the rest of the buffer as not fontified after a change.
- Installed on `after-change-functions'.
- START and END are the start and end of the changed text. OLD-LEN
- is the pre-change length.
- This function ensures that lines following the change will be refontified
- in case the syntax of those lines has changed. Refontification
- will take place when text is fontified stealthily."
- (when (and jit-lock-mode (not memory-full))
- (let ((jit-lock-start start)
- (jit-lock-end end))
- (with-buffer-prepared-for-jit-lock
- (run-hook-with-args 'jit-lock-after-change-extend-region-functions
- start end old-len)
- ;; Make sure we change at least one char (in case of deletions).
- (setq jit-lock-end (min (max jit-lock-end (1+ start)) (point-max)))
- ;; Request refontification.
- (put-text-property jit-lock-start jit-lock-end 'fontified nil))
- ;; Mark the change for deferred contextual refontification.
- (when jit-lock-context-unfontify-pos
- (setq jit-lock-context-unfontify-pos
- ;; Here we use `start' because nothing guarantees that the
- ;; text between start and end will be otherwise refontified:
- ;; usually it will be refontified by virtue of being
- ;; displayed, but if it's outside of any displayed area in the
- ;; buffer, only jit-lock-context-* will re-fontify it.
- (min jit-lock-context-unfontify-pos jit-lock-start))))))
- (provide 'jit-lock)
- ;;; jit-lock.el ends here
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