func Load(path string) (tao.Guard, error) { s, err := NewScanner(path) if err != nil { return nil, err } t := s.NextLine() var g tao.Guard switch t { case "acl": g = tao.NewACLGuard() case "datalog": g = tao.NewTemporaryDatalogGuard() case "": return nil, fmt.Errorf("%s: first line must specify 'datalog' or 'acl'\n", path) default: return nil, fmt.Errorf("%s: expected 'datalog' or 'acl', found %q\n", path, t) } for line := s.NextLine(); line != ""; line = s.NextLine() { err = g.AddRule(line) if err != nil { return nil, fmt.Errorf("%s: %s; processing this line:\n> %s\n", path, err, line) } } return g, nil }