Method quoteRawString

helpers.go:180–209

quoteRawString escapes only characters that need quoting according to https://www.rfc-editor.org/rfc/rfc9110#section-5.6.4 so the result may contain non-ASCII bytes.

(raw string)

// https://www.rfc-editor.org/rfc/rfc9110#section-5.6.4 so the result may
// contain non-ASCII bytes.
func (*App) quoteRawString(raw string) string {
	const hex = "0123456789ABCDEF"
	bb := bytebufferpool.Get()
	defer bytebufferpool.Put(bb)

	for i := 0; i < len(raw); i++ {
		c := raw[i]
		switch {
		case c == '\\' || c == '"':
			// escape backslash and quote
			bb.B = append(bb.B, '\\', c)
		case c == '\n':
			bb.B = append(bb.B, '\\', 'n')
		case c == '\r':
			bb.B = append(bb.B, '\\', 'r')
		case c < 0x20 || c == 0x7f:
			// percent-encode control and DEL
			bb.B = append(
				bb.B,
				'%',
				hex[c>>4],
				hex[c&0x0f],
			)
		default:
			bb.B = append(bb.B, c)
		}
	}

	return string(bb.B)
}

// isASCII reports whether the provided string contains only ASCII characters.
// See: https://www.rfc-editor.org/rfc/rfc0020