This function returns a list of all the overlays that cover the character at position pos in the current buffer. If sorted is non-
nil, the list is in decreasing order of priority, otherwise it is in no particular order. An overlay contains position pos if it begins at or before pos, and ends after pos.
To illustrate usage, here is a Lisp function that returns a list of the overlays that specify property prop for the character at point:(defun find-overlays-specifying (prop) (let ((overlays (overlays-at (point))) found) (while overlays (let ((overlay (car overlays))) (if (overlay-get overlay prop) (setq found (cons overlay found)))) (setq overlays (cdr overlays))) found))
This function returns a list of the overlays that overlap the region beg through end. “Overlap” means that at least one character is contained within the overlay and also contained within the specified region; however, empty overlays are included in the result if they are located at beg, strictly between beg and end, or at end when end denotes the position at the end of the buffer.
This function returns the buffer position of the next beginning or end of an overlay, after pos. If there is none, it returns
This function returns the buffer position of the previous beginning or end of an overlay, before pos. If there is none, it returns
As an example, here's a simplified (and inefficient) version of the
(see Property Search). It searches forward from position
pos for the next position where the value of a given property
prop, as obtained from either overlays or text properties,
(defun next-single-char-property-change (position prop) (save-excursion (goto-char position) (let ((propval (get-char-property (point) prop))) (while (and (not (eobp)) (eq (get-char-property (point) prop) propval)) (goto-char (min (next-overlay-change (point)) (next-single-property-change (point) prop))))) (point)))