# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1475774923 -7200
# Node ID 009092555b7411b17d4266dcae943308f1a57199
# Parent  a31283db845b086030f39a9d95ef0b3f0608b3ea
Added an origin parent retrieval method, also fixing the ancestors method.

diff -r a31283db845b -r 009092555b74 referencing.py
--- a/referencing.py	Thu Oct 06 14:29:02 2016 +0200
+++ b/referencing.py	Thu Oct 06 19:28:43 2016 +0200
@@ -145,6 +145,15 @@
         self.origin = ref.origin
         self.name = ref.name
 
+    def parent(self):
+
+        "Return the parent of this reference's origin."
+
+        if not self.get_origin():
+            return None
+
+        return self.get_origin().rsplit(".", 1)[0]
+
     def ancestors(self):
 
         """
@@ -152,7 +161,7 @@
         depth.
         """
 
-        if not self.origin:
+        if not self.get_origin():
             return None
 
         parts = self.get_origin().split(".")