Function jsonMarshalStringTo

pkg/types/json_binary.go:397–467

(buf, s []byte)

}

func jsonMarshalStringTo(buf, s []byte) []byte {
	// NOTE: copied from Go standard library.
	// NOTE: keep in sync with string above.
	buf = append(buf, '"')
	start := 0
	for i := 0; i < len(s); {
		if b := s[i]; b < utf8.RuneSelf {
			if jsonSafeSet[b] {
				i++
				continue
			}
			if start < i {
				buf = append(buf, s[start:i]...)
			}
			switch b {
			case '\\', '"':
				buf = append(buf, '\\', b)
			case '\n':
				buf = append(buf, '\\', 'n')
			case '\r':
				buf = append(buf, '\\', 'r')
			case '\t':
				buf = append(buf, '\\', 't')
			default:
				// This encodes bytes < 0x20 except for \t, \n and \r.
				// If escapeHTML is set, it also escapes <, >, and &
				// because they can lead to security holes when
				// user-controlled strings are rendered into JSON
				// and served to some browsers.
				buf = append(buf, `\u00`...)
				buf = append(buf, jsonHexChars[b>>4], jsonHexChars[b&0xF])
			}
			i++
			start = i
			continue
		}
		c, size := utf8.DecodeRune(s[i:])
		if c == utf8.RuneError && size == 1 {
			if start < i {
				buf = append(buf, s[start:i]...)
			}
			buf = append(buf, `\ufffd`...)
			i += size
			start = i
			continue
		}
		// U+2028 is LINE SEPARATOR.
		// U+2029 is PARAGRAPH SEPARATOR.
		// They are both technically valid characters in JSON strings,
		// but don't work in JSONP, which has to be evaluated as JavaScript,
		// and can lead to security holes there. It is valid JSON to
		// escape them, so we do so unconditionally.
		// See http://timelessrepo.com/json-isnt-a-javascript-subset for discussion.
		if c == '\u2028' || c == '\u2029' {
			if start < i {
				buf = append(buf, s[start:i]...)
			}
			buf = append(buf, `\u202`...)