(extent-properties, extent-at): New functions.

1 files changed, 25 insertions, 0 deletions

diff --git a/lisp/emacs-lisp/lucid.el b/lisp/emacs-lisp/lucid.el
index e7dc74e4d4b..80c5973046c 100644
--- a/lisp/emacs-lisp/lucid.el
+++ b/lisp/emacs-lisp/lucid.el
@@ -141,6 +141,31 @@ bottom of the buffer stack."
 (defun make-extent (beg end &optional buffer)
   (make-overlay beg end buffer))
 
+(defun extent-properties (extent)
+  (overlay-properties extent))
+
+(defun extent-at (pos &optional object property before)
+  (with-current-buffer (or object (current-buffer))
+    (let ((overlays (overlays-at pos)))
+      (when property
+        (let (filtered)
+          (while overlays
+            (if (overlay-get (car overlays) property)
+                (setq filtered (cons (car overlays) filtered)))
+            (setq overlays (cdr overlays)))
+          (setq overlays filtered)))
+      (setq overlays
+            (sort overlays
+                  (function (lambda (o1 o2)
+                              (let ((p1 (or (overlay-get o1 'priority) 0))
+                                    (p2 (or (overlay-get o2 'priority) 0)))
+                                (or (> p1 p2)
+                                    (and (= p1 p2)
+                                         (> (overlay-start o1) (overlay-start o2)))))))))
+      (if before
+          (nth 1 (memq before overlays))
+        (car overlays)))))
+
 (defun set-extent-property (extent prop value)
   ;; Make sure that separate adjacent extents
   ;; with the same mouse-face value