CDR.cz / DIIT.cz troll remover

// ==UserScript==
// @name CDR.cz / DIIT.cz troll remover
// @namespace http://tampermonkey.net/
// @version 0.1
// @description Hide comments from trolls on cdr.cz and diit.cz
// @author LipcaCZ
// @match https://diit.cz/clanek/*/diskuse
// @match https://cdr.cz/clanek/*/diskuse
// @grant none
// ==/UserScript==

(function() {
    'use strict';

    var trolls = [
        'JirkaK',
        'ASClIIIl',
        'RedMaX',
        'ATITom',
        '8xALU-Phoenix',
        'Mirda Červíček',
        'DEC-Alpha-EV8',
        'Tomáš Černák',
        'g6free'
    ];

    var trollsQuoted = trolls.map(name => '"'+name+'"');
    var trollsCondition = trollsQuoted.join(' or .=');

    function _x(STR_XPATH) {
        var xresult = document.evaluate(STR_XPATH, document, null, XPathResult.ANY_TYPE, null);
        var xnodes = [];
        var xres;
        while (xres = xresult.iterateNext()) {
            xnodes.push(xres);
        }

        return xnodes;
    }

    var trollComments = window.jQuery(_x('//*[contains(@class,"comment ") and contains(@class,"clearfix") and .//*[contains(@class,"username") and (.=' + trollsCondition + ')]]'));

    trollComments.each(function() {
        var comment = window.jQuery(this);
        var originalContent = comment.html();
        var trollName = comment.find('.username').text();
        comment.data('originalContent', originalContent);
        comment.html('[Trollovina odfiltrována]<br>');
        var showButton = window.jQuery('<button>Zobrazit komentář od ' + trollName + '</button>');
        showButton.css({
            'background-color': 'lightgrey',
            'border': 'none',
            'color': 'black',
            'padding': '5px 4px',
            'text-align': 'center',
            'text-decoration': 'none',
            'display': 'inline-block',
            'font-size': '12px',
            'margin': '5px 10px',
            'cursor': 'pointer'
        });
        showButton.on('click', function() {
            comment.html(comment.data('originalContent'));
        });
        comment.append(showButton);
    });
})();