code: def __parse(self, stream, has_orgs):
          
          if has_orgs:
              self.__parse_organizations(stream)
          else:
              self.__parse_identities(stream)
docs: Parse identities and organizations using mailmap format.
  
          Mailmap format is a text plain document that stores on each
          line a map between an email address and its aliases. Each
          line follows any of the next formats:
  
              Proper Name <commit@email.xx>
              <proper@email.xx> <commit@email.xx>
              Proper Name <proper@email.xx> <commit@email.xx>
              Proper Name <proper@email.xx> Commit Name <commit@email.xx>
  
          When the flag `has_orgs` is set, the stream maps organizations
          an identities, following the next format:
  
              Organization Name <org@email.xx> Proper Name <proper@email.xx>
  
          :parse data: mailmap stream to parse
  
          :raise InvalidFormatError: raised when the format of the stream is
              not valid.