FATE dice replacer script

// ==UserScript==
// @name         FATE dice replacer
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Replaces 4d6 rolls with FATE rolls
// @author       You
// @match        https://ponyach.ru/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

var codes = {
	8: 'legendary',
	7: 'epic',
	6: 'fantastic',
	5: 'superb',
	4: 'great',
	3: 'good',
	2: 'fair',
	1: 'average',
	0: 'mediocre',
	'-1': 'poor',
	'-2': 'terrible',
};
$('.dice').each(function() {
	var t = $(this).text();
	if(t.substr(0, 4) != '4d6 ') return;
	var res = t.split('(')[1].split(')')[0].split('+');
	var sum = 0;
	var vals = [];
    var dvals = [];
    var dsum = 0;
	for(var s of res)
	{
		var i = parseInt(s);
        dsum += i;
        dvals.push(i);
		var v = 0;
		if(i < 3)
			v = -1;
		else if(i > 4)
			v = 1;
		sum += v;
		if(v < 0)
			vals.push('-');
		else if(v > 0)
			vals.push('+');
		else
			vals.push(' ');
	}
	var c = '';
	if(codes[sum]) c = ' (' + codes[sum] + ')';
	$(this).text('4d6 ('+dvals.join('')+'='+dsum+') (['+vals.join('][')+']) = '+sum+c);
});

})();