1217             return context.changectx(self, changeid)

  1219             if isinstance(changeid, int):

  1220                 node = self.changelog.node(changeid)

  1221                 rev = changeid

  1222                 return context.changectx(self, rev, node)

  1223             elif changeid == 'null':

  1224                 node = nullid

  1225                 rev = nullrev

  1226                 return context.changectx(self, rev, node)

  1227             elif changeid == 'tip':

  1228                 node = self.changelog.tip()

  1229                 rev = self.changelog.rev(node)

  1230                 return context.changectx(self, rev, node)

  1231             elif (changeid == '.'

  1232                   or self.local() and changeid == self.dirstate.p1()):

  1233                 # this is a hack to delay/avoid loading obsmarkers

  1234                 # when we know that '.' won't be hidden

  1235                 node = self.dirstate.p1()

  1236                 rev = self.unfiltered().changelog.rev(node)

  1237                 return context.changectx(self, rev, node)

  1238             elif len(changeid) == 20:

  1239                 try:

  1240                     node = changeid

  1241                     rev = self.changelog.rev(changeid)

  1242                     return context.changectx(self, rev, node)

  1243                 except error.FilteredLookupError:

  1244                     changeid = hex(changeid) # for the error message

  1245                     raise

  1246                 except LookupError:

  1247                     # check if it might have come from damaged dirstate

  1248                     #

  1249                     # XXX we could avoid the unfiltered if we had a recognizable

  1250                     # exception for filtered changeset access

  1251                     if (self.local()

  1252                         and changeid in self.unfiltered().dirstate.parents()):

  1253                         msg = _("working directory has unknown parent '%s'!")

  1254                         raise error.Abort(msg % short(changeid))

  1255                     changeid = hex(changeid) # for the error message

  1256 

  1257             elif len(changeid) == 40:

  1258                 try:

  1259                     node = bin(changeid)

  1260                     rev = self.changelog.rev(node)

  1261                     return context.changectx(self, rev, node)

  1262                 except error.FilteredLookupError:

  1263                     raise

  1264                 except LookupError:

  1265                     pass

  1266             else:

  1267                 raise error.ProgrammingError(

  1268                         "unsupported changeid '%s' of type %s" %

  1269                         (changeid, type(changeid)))

  1270 

  1271         except (error.FilteredIndexError, error.FilteredLookupError):

  1272             raise error.FilteredRepoLookupError(_("filtered revision '%s'")

  1273                                                 % pycompat.bytestr(changeid))

  1274         except IndexError:

  1275             pass