Method Backup

strings.go:99–105

Backup moves the position pointer back by the length of the previous rune in the input string.

()

// Backup moves the position pointer back by the length of the
// previous rune in the input string.
func (s *stringLexer) Backup() {
	if s.done || s.pos <= 0 {
		return
	}
	_, l := utf8.DecodeLastRuneInString(s.str[:s.pos])
	s.pos -= l
}

// Peek returns the next rune in the input string without advancing
// the position pointer