Lepro Total Comments JS

lepro total comments JS
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// ==UserScript==
// @name         Lepro Total Comments JS
// @description  lepro total comments JS
// @license      MIT
// @namespace    leprosorium.ru
// @include      http://leprosorium.ru/comments/*
// @include      http://*.leprosorium.ru/comments/*
// @include      http*://leprosorium.ru/comments/*
// @include      http*://*.leprosorium.ru/comments/*
// @copyright    2016, lynxtaa
// @grant        none
// @version      1.51
// ==/UserScript==

var BEST_TRESHOLD = 0.75, // Порог рейтинга, можно поиграться со значением
	std_dev;

var all = document.createElement('a'),
	best = document.createElement('a'),
	controls = document.getElementById('js-comments').querySelector('.b-comments_controls'),
	holder = document.getElementById('js-comments_holder'),
	style = document.createElement('style');

style.textContent = ".is_hidden { display: none; }";
document.body.appendChild(style);

controls.querySelector('a[data-key="sort"]').className = '';

// Кнопки управления
best.textContent = 'лучшие';
all.textContent = 'все';
controls.appendChild(best);
controls.appendChild(all);

// Лучшие
best.addEventListener('click', function(e) {
	e.preventDefault();

	if (this.className === 'active') {
		return false;
	}

	this.className = 'active';
	this.nextSibling.className = '';

	if (std_dev) {
		document.body.appendChild(style);
	} else {
		parseComments();
	}
}, false);

// Показать всё
all.addEventListener('click', function(e) {
	e.preventDefault();

	if (std_dev && this.className !== 'active') {
		this.className = 'active';
		this.previousSibling.className = '';
		document.body.removeChild(style);
	}
}, false);


function parseComments() {
	var votes = [].slice.call(holder.querySelectorAll('strong.vote_result'));
	var	abovenull = 0,
		rating_square_sum = 0,
		rating_sum = 0,
		shown = votes.length;

	var ratings = votes.map(function(el) {
		var rating = +el.textContent;

		if (rating > 0) {
			abovenull++;
			rating_sum += rating;
			rating_square_sum += Math.pow(rating, 2);
		}

		return { el, rating };
	});

	if (!abovenull) return null;

	std_dev = Math.sqrt((rating_square_sum / abovenull) -
				Math.pow(rating_sum / abovenull, 2));

	for (var i = ratings.length; i--; ) {
		if (ratings[i].rating / std_dev >= BEST_TRESHOLD) continue;

		var comment = ratings[i].el.parentNode.parentNode.parentNode.parentNode;
		if (!comment.classList.contains('comment')) throw Error("Can't find comment.");
		comment.classList.add('is_hidden');
		shown--;
	}

	best.setAttribute('title', shown);
}