hard-to-read-FizzBuzz.hx

class FizzBuzz {
    public static inline var FIZZ = "Fizz";
    public static inline var BUZZ = "Buzz";

    private var s:String;

    public function new(s:String) {
        this.s = s;
    }

    public function toString():String {
        var b = fizz(s) | buzz(s);
        var r = b ^ 3;
        var n = (r & 1) * FIZZ.length + ((r >> 1) & r) * BUZZ.length;
        var l = ((r >> 1) & r) * s.length + (b & 1) * FIZZ.length
                + (b >> 1) * BUZZ.length;
        return (FIZZ + BUZZ + s).substr(n, l);
    }

    function fizz(s:String):Int {
        if (s.length == 1) {
            switch (s.charCodeAt(0)) {
                case 48, 51, 54, 57:
                    return 1;
                default:
                    return 0;
            }
        }

        var n = 0;
        for (c in s.split('')) {
            n += c.charCodeAt(0) - 48;
        }
        return fizz(Std.string(n));
    }

    function buzz(s:String):Int {
        switch (s.charCodeAt(s.length - 1)) {
            case 48, 53:
                return 2;
            default:
                return 0;
        }
    }
}