AO3 Word Count Script

Adds word counts to chapter links on AO3 Chapter Index pages.
当前为 2023-03-18 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name            AO3 Word Count Script
// @name:ru         Скрипт подсчета слов на AO3
// @version         2
// @description     Adds word counts to chapter links on AO3 Chapter Index pages.
// @description:ru  Добавляет количество слов к ссылкам на главы на страницах индекса глав AO3.
// @author          Anton Dumov
// @license         MIT
// @match           https://archiveofourown.org/*/navigate
// @grant           none
// @namespace http://tampermonkey.net/
// ==/UserScript==

(function() {
    'use strict';

    const wordCountRegex = /\s+/g;
    const cacheKeyPrefix = "ao3-word-count-cache-";
    const cacheDurationMs = 24 * 60 * 60 * 1000; // 24 hours in milliseconds

    const getCachedWordCount = link => {
        const cacheKey = cacheKeyPrefix + link.href;
        const cachedValue = localStorage.getItem(cacheKey);
        if (cachedValue) {
            const { timestamp, wordCount } = JSON.parse(cachedValue);
            if (Date.now() - timestamp < cacheDurationMs) {
                return wordCount;
            } else {
                localStorage.removeItem(cacheKey);
            }
        }
        return null;
    };

    const setCachedWordCount = (link, wordCount) => {
        const cacheKey = cacheKeyPrefix + link.href;
        const cacheValue = JSON.stringify({ timestamp: Date.now(), wordCount });
        localStorage.setItem(cacheKey, cacheValue);
    };

    const chapterLinks = document.querySelectorAll("ol.chapter.index.group li a");

    chapterLinks.forEach(link => {
        const cachedWordCount = getCachedWordCount(link);
        if (cachedWordCount) {
            const spanElement = link.parentElement.querySelector('span.datetime');
            const wordCountElement = document.createElement("span");
            wordCountElement.textContent = ` (${cachedWordCount} words)`;
            spanElement.parentNode.insertBefore(wordCountElement, spanElement.nextSibling);
        } else {
            fetch(link.href).then(response => response.text())
                .then(text => {
                    const parser = new DOMParser();
                    const doc = parser.parseFromString(text, "text/html");
                    const article = doc.querySelector("div[role=article]");
                    const wordCount = article ? article.textContent.trim().split(wordCountRegex).length : 0;
                    setCachedWordCount(link, wordCount);

                    const spanElement = link.parentElement.querySelector('span.datetime');
                    const wordCountElement = document.createElement("span");
                    wordCountElement.textContent = ` (${wordCount} words)`;
                    spanElement.parentNode.insertBefore(wordCountElement, spanElement.nextSibling);
                })
                .catch(error => console.log(error));
        }
    });

})();