ancestor.lazyancestors: take parentrevs function rather than changelog

Principle of least privilege, and it also brings this in line with
missingancestors.

mercurial/ancestor.py

@@ -216,7 +216,7 b' def missingancestors(revs, bases, pfunc)'
     return missing
 
 class lazyancestors(object):
-    def __init__(self, cl, revs, stoprev=0, inclusive=False):
+    def __init__(self, pfunc, revs, stoprev=0, inclusive=False):
         """Create a new object generating ancestors for the given revs. Does
         not generate revs lower than stoprev.
 
@@ -228,7 +228,7 b' class lazyancestors(object):'
         than stoprev will not be generated.
 
         Result does not include the null revision."""
-        self._parentrevs = cl.parentrevs
+        self._parentrevs = pfunc
         self._initrevs = revs
         self._stoprev = stoprev
         self._inclusive = inclusive

mercurial/revlog.py

@@ -407,7 +407,7 b' class revlog(object):'
 
         See the documentation for ancestor.lazyancestors for more details."""
 
-        return ancestor.lazyancestors(self, revs, stoprev=stoprev,
+        return ancestor.lazyancestors(self.parentrevs, revs, stoprev=stoprev,
                                       inclusive=inclusive)
 
     def descendants(self, revs):

tests/test-ancestor.py

@@ -34,9 +34,6 b' graph = {0: [-1], 1: [0], 2: [1], 3: [1]'
          13: [8]}
 pfunc = graph.get
 
-class mockchangelog(object):
-    parentrevs = graph.get
-
 def runmissingancestors(revs, bases):
     print "%% ancestors of %s and not of %s" % (revs, bases)
     print ancestor.missingancestors(revs, bases, pfunc)
@@ -76,7 +73,7 b' def test_missingancestors():'
 def genlazyancestors(revs, stoprev=0, inclusive=False):
     print ("%% lazy ancestor set for %s, stoprev = %s, inclusive = %s" %
            (revs, stoprev, inclusive))
-    return ancestor.lazyancestors(mockchangelog, revs, stoprev=stoprev,
+    return ancestor.lazyancestors(graph.get, revs, stoprev=stoprev,
                                   inclusive=inclusive)
 
 def printlazyancestors(s, l):