Function appendToLower

json/parse.go:752–774

(b, s []byte)

}

func appendToLower(b, s []byte) []byte {
	if ascii.Valid(s) { // fast path for ascii strings
		i := 0

		for j := range s {
			c := s[j]

			if 'A' <= c && c <= 'Z' {
				b = append(b, s[i:j]...)
				b = append(b, c+('a'-'A'))
				i = j + 1
			}
		}

		return append(b, s[i:]...)
	}

	for _, r := range string(s) {
		b = appendRune(b, foldRune(r))
	}

	return b
}

func foldRune(r rune) rune {
	if r = unicode.SimpleFold(r); 'A' <= r && r <= 'Z' {