Function h2I

escape.go:24–34

(c byte)

const badHex = -1

func h2I(c byte) int {
	switch {
	case c >= '0' && c <= '9':
		return int(c - '0')
	case c >= 'A' && c <= 'F':
		return int(c - 'A' + 10)
	case c >= 'a' && c <= 'f':
		return int(c - 'a' + 10)
	}
	return badHex
}

// decodeSingleUnicodeEscape decodes a single \uXXXX escape sequence. The prefix \u is assumed to be present and
// is not checked.