From d119d80c73d525760c5eacf637723199d94d8ae6 Mon Sep 17 00:00:00 2001
From: Healfdene Goguen
Date: Fri, 15 May 1998 16:24:53 +0000
Subject: Dependencies on versions of emacs have been moved to span-extent.el
 and span-overlay.el.

This file was developed for xemacs.
---
 span-extent.el | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 span-extent.el

diff --git a/span-extent.el b/span-extent.el
new file mode 100644
index 00000000..283583d4
--- /dev/null
+++ b/span-extent.el
@@ -0,0 +1,53 @@
+; This file is an attempt to abstract away from the differences between
+; XEmacs and FSF Emacs. Everything that is done differently between one
+; or other version should be appropriately wrapped in here.
+
+;;; Now define "spans" in terms of extents.
+
+(defsubst make-span (start end)
+  (make-extent start end))
+
+(defsubst detach-span (span)
+  (detach-extent span))
+
+(defsubst set-span-endpoints (span start end)
+  (set-extent-endpoints span start end))
+
+(defsubst set-span-start (span value)
+  (set-extent-endpoints span value (extent-end-position span)))
+
+(defsubst set-span-end (span value)
+  (set-extent-endpoints span (extent-start-position span) value))
+
+(defsubst span-property (span name)
+  (extent-property span name))
+
+(defsubst set-span-property (span name value)
+  (set-extent-property span name value))
+
+(defsubst delete-span (span)
+  (delete-extent span))
+
+(defsubst delete-spans (start end prop)
+  (mapcar-extents 'delete-extent nil (current-buffer) start end  nil prop))
+
+(defsubst span-at (pt prop)
+  (extent-at pt nil prop))
+
+(defsubst span-at-before (pt prop)
+  (extent-at pt nil prop nil 'before))
+  
+(defsubst span-start (span)
+  (extent-start-position span))
+
+(defsubst span-end (span)
+  (extent-end-position span))
+
+(defsubst prev-span (span prop)
+  (extent-at (extent-start-position span) nil prop nil 'before))
+
+(defsubst next-span (span prop)
+  (extent-at (extent-end-position span) nil prop nil 'after))
+
+
+(provide 'span-extent)
-- 
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