func removeComment(line string) string {
	if i := bytealg.IndexByteString(line, '#'); i != -1 {
		return line[:i]
	}
	return line
}

// foreachField runs fn on each non-empty run of non-space bytes in x.
// It returns the first non-nil error returned by fn.
func foreachField(x string, fn func(field string) error) error {
	x = trimSpace(x)
	for len(x) > 0 {
		sp := bytealg.IndexByteString(x, ' ')
		if sp == -1 {

				source:   src,
				criteria: criteria,
			})
		}
	}
	return conf
}

// parses "foo=bar !foo=bar"
func parseCriteria(x string) (c []nssCriterion, err error) {
	err = foreachField(x, func(f string) error {
		not := false
		if len(f) > 0 && f[0] == '!' {
			not = true
			f = f[1:]
		}
		if len(f) < 3 {
			return errors.New("criterion too short")
		}