[Mac] [JXA] replace selected text to sudden death wrapped

sudden_death.js

function run(input, parameters) {
    String.prototype.getLengthByte = function () {
        var self = this,
            count = 0,
            char,
            i;
        for (i = 0; i < self.length; i++) {
            char = self.charCodeAt(i);
            if ((char >= 0x0 && char < 0x81) || (char == 0xf8f0) ||
                (char >= 0xff61 && char < 0xffa0) || (char >= 0xf8f1 && char < 0xf8f4)) {
                count += 1;
            } else {
                count += 2;
            }
        }
        return count;
    };

    String.prototype.repeat = function (n) {
        return new Array(n + 1).join(this);
    };

    function suddenDeath(str) {
        var len = Math.floor(str.getLengthByte() / 2);
        return "＿" + ("人".repeat(len + 2)) + "＿\n" +
            "＞　" + str + "　＜\n" +
            "￣Y^" + ("Y^".repeat(len)) + "￣";
    }

    return suddenDeath(input.toString());
}