513     def emitrevisiondeltas(self, requests):

   514         for request in requests:

   515             node = request.node

   516             rev = self.rev(node)

   517 

   518             if request.basenode == nullid:

   519                 baserev = nullrev

   520             elif request.basenode is not None:

   521                 baserev = self.rev(request.basenode)

   522             else:

   523                 # This is a test extension and we can do simple things

   524                 # for choosing a delta parent.

   525                 baserev = self.deltaparent(rev)

   526 

   527                 if baserev != nullrev and not self._candelta(baserev, rev):

   528                     baserev = nullrev

   529 

   530             revision = None

   531             delta = None

   532             baserevisionsize = None

   533 

   534             if self.iscensored(baserev) or self.iscensored(rev):

   535                 try:

   536                     revision = self.revision(node, raw=True)

   537                 except error.CensoredNodeError as e:

   538                     revision = e.tombstone

   539 

   540                 if baserev != nullrev:

   541                     baserevisionsize = self.rawsize(baserev)

   542 

   543             elif baserev == nullrev:

   544                 revision = self.revision(node, raw=True)

   545             else:

   546                 delta = self.revdiff(baserev, rev)

   547 

   548             extraflags = revlog.REVIDX_ELLIPSIS if request.ellipsis else 0

   549 

   550             yield simplestorerevisiondelta(

   551                 node=node,

   552                 p1node=request.p1node,

   553                 p2node=request.p2node,

   554                 linknode=request.linknode,

   555                 basenode=self.node(baserev),

   556                 flags=self.flags(rev) | extraflags,

   557                 baserevisionsize=baserevisionsize,

   558                 revision=revision,

   559                 delta=delta)

   560