# HG changeset patch
# User Lucas Moscovicz <lmoscovicz@fb.com>
# Date 2014-02-18 21:07:08
# Node ID 4f68acdb22ff89f5a1990aaed4321c4931109c2a
# Parent  d7e96dd8e995b44d39c2b157857be01dff65425e

revset: changed methods in spanset to return ordered sets

Now __sub__ and __and__ can smartly return ordered lazysets.

diff --git a/mercurial/revset.py b/mercurial/revset.py
--- a/mercurial/revset.py
+++ b/mercurial/revset.py
@@ -2409,12 +2409,18 @@ class spanset(object):
     def __and__(self, x):
         if isinstance(x, baseset):
             x = x.set()
-        return lazyset(self, lambda r: r in x)
+        if self._start <= self._end:
+            return orderedlazyset(self, lambda r: r in x)
+        else:
+            return orderedlazyset(self, lambda r: r in x, ascending=False)
 
     def __sub__(self, x):
         if isinstance(x, baseset):
             x = x.set()
-        return lazyset(self, lambda r: r not in x)
+        if self._start <= self._end:
+            return orderedlazyset(self, lambda r: r not in x)
+        else:
+            return orderedlazyset(self, lambda r: r not in x, ascending=False)
 
     def __add__(self, x):
         def iterates():