Function: jit-lock-after-change

jit-lock-after-change is a byte-compiled function defined in jit-lock.el.gz.

Signature

(jit-lock-after-change START END OLD-LEN)

Documentation

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.

Source Code

;; Defined in /usr/src/emacs/lisp/jit-lock.el.gz
(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-silent-modifications
       (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.
       (save-restriction
	 (widen)
	 (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))))))