Function getu4

fflib/v1/jsonstring.go:243–252

getu4 decodes \uXXXX from the beginning of s, returning the hex value, or it returns -1.

(s []byte)

// getu4 decodes \uXXXX from the beginning of s, returning the hex value,
// or it returns -1.
func getu4(s []byte) rune {
	if len(s) < 6 || s[0] != '\\' || s[1] != 'u' {
		return -1
	}
	r, err := strconv.ParseUint(string(s[2:6]), 16, 64)
	if err != nil {
		return -1
	}
	return rune(r)
}

// TODO(pquerna): consider combining wibth the normal byte mask.
var lt [256]bool = [256]bool{