def _ContinuationAlignStyleStringConverter(s):
  """Option value converter for a continuation align style string."""
  accepted_styles = ('SPACE', 'FIXED', 'VALIGN-RIGHT')
  if s:
    r = s.strip('"\'').replace('_', '-').upper()
    if r not in accepted_styles:
      raise ValueError('unknown continuation align style: %r' % (s,))
  else:
    r = accepted_styles[0]
  return r