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View All Editorials

View all editorials of the AtCoder contest in one page.

目前為 2022-10-16 提交的版本，檢視 最新版本。

// ==UserScript==
// @name            View All Editorials
// @name:ja         解説ぜんぶ見る
// @description     View all editorials of the AtCoder contest in one page.
// @description:ja  AtCoderコンテストの解説ページに、すべての問題の解説をまとめて表示します。
// @version         1.3.3
// @icon            https://www.google.com/s2/favicons?domain=atcoder.jp
// @match           https://atcoder.jp/contests/*/editorial
// @match           https://atcoder.jp/contests/*/editorial?*
// @grant           GM_addStyle
// @namespace       https://gitlab.com/w0mbat/user-scripts
// @author          w0mbat
// ==/UserScript==

(async function () {
  'use strict';
  console.log(`🐻 "View All Editorials" start execution. 🐻`)

  const appendHeadChild = (tagName, options) =>
    Object.assign(document.head.appendChild(document.createElement(tagName)), options);
  const addScript = (src) => new Promise((resolve) => {
    appendHeadChild('script', { src, type: 'text/javascript', onload: resolve });
  });
  const addStyleSheet = (src) => new Promise((resolve) => {
    appendHeadChild('link', { rel: 'stylesheet', href: src, onload: resolve });
  });

  const loadKaTex = async () => {
    await addStyleSheet("https://cdn.jsdelivr.net/npm/[email protected]/dist/katex.min.css");
    await addScript("https://cdn.jsdelivr.net/npm/[email protected]/dist/katex.min.js");
    await addScript("https://cdn.jsdelivr.net/npm/[email protected]/dist/contrib/auto-render.min.js");
    const kaTexOptions = {
      delimiters: [
        { left: "$$", right: "$$", display: true },
        { left: "$", right: "$", display: false },
        { left: "\\(", right: "\\)", display: false },
        { left: "\\[", right: "\\]", display: true }
      ],
      ignoredTags: ["script", "noscript", "style", "textarea", "code", "option"],
      ignoredClasses: ["prettyprint", "source-code-for-copy"],
      throwOnError: false
    };
    /* global renderMathInElement */
    renderMathInElement && renderMathInElement(document.body, kaTexOptions);
  };

  const loadPrettifier = async () =>
    await addScript("https://cdn.rawgit.com/google/code-prettify/master/loader/run_prettify.js");

  const scrape = (doc) =>
    doc.querySelector("#main-container > div.row > div:nth-child(2) > div:nth-of-type(1)");
  const loadEditorial = async (link) => {
    const response = await fetch(link.href);
    if (!response.ok) throw "Fetch failed";
    const dom = scrape(new DOMParser().parseFromString(await response.text(), 'text/html'));
    if (!dom) throw "Scraping failed";
    link.parentNode.appendChild(dom).classList.add('🐻-editorial-content');
  };

  const filter4InternalEditorialLink = (link) => link.href.match(/\/contests\/.+\/editorial\//);
  const loadAllEditorials = () => Promise.all(
    Array.prototype.filter.call(document.getElementsByTagName('a'), filter4InternalEditorialLink)
      .map(e => loadEditorial(e).catch(ex => console.warn(`🐻 Something wrong: "${e.href}", ${ex}`))));

  GM_addStyle(`
    pre code { tab-size: 2; }
    #main-container > div.row > div:nth-child(2) > ul > li { font-size: larger; }
    .🐻-editorial-content { margin: 0.3em 0 1.5em; font-size: smaller; }
  `);
  await loadAllEditorials();
  await loadKaTex();
  await loadPrettifier();

  console.log(`🐻 "View All Editorials" end execution. 🐻`)
})();