427 def parsesplicemap(path):

   428     """Parse a splicemap, return a child/parents dictionary."""

   429     if not path:

   430         return {}

   431     m = {}

   432     try:

   433         fp = open(path, 'r')

   434         for i, line in enumerate(fp):

   435             line = line.splitlines()[0].rstrip()

   436             if not line:

   437                 # Ignore blank lines

   438                 continue

   439             try:

   440                 child, parents = line.split(' ', 1)

   441                 parents = parents.replace(',', ' ').split()

   442             except ValueError:

   443                 raise util.Abort(_('syntax error in %s(%d): child parent1'

   444                                    '[,parent2] expected') % (path, i + 1))

   445             pp = []

   446             for p in parents:

   447                 if p not in pp:

   448                     pp.append(p)

   449             m[child] = pp

   450     except IOError, e:

   451         if e.errno != errno.ENOENT:

   452             raise

   453     return m

   454