AtCoder Problems 上に表示される問題にユーザが独自のマーカー（解説ACなど）を付けられるようにします
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// ==UserScript==
// @name AtCoder Problems Marker
// @namespace iilj
// @version 2020.1.27.1
// @description AtCoder Problems 上に表示される問題にユーザが独自のマーカー（解説ACなど）を付けられるようにします
// @author iilj
// @supportURL https://github.com/iilj/AtCoderProblemsMarker/issues
// @match https://kenkoooo.com/atcoder/*
// @require https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js
// @require https://cdnjs.cloudflare.com/ajax/libs/jquery-contextmenu/2.7.1/jquery.contextMenu.min.js
// @require https://cdnjs.cloudflare.com/ajax/libs/jquery-contextmenu/2.7.1/jquery.ui.position.js
// @resource css_contextmenu https://cdnjs.cloudflare.com/ajax/libs/jquery-contextmenu/2.7.1/jquery.contextMenu.min.css
// @grant GM_addStyle
// @grant GM_getResourceText
// ==/UserScript==
/* globals $ */
(function () {
'use strict';
GM_addStyle(GM_getResourceText('css_contextmenu'));
GM_addStyle(`
td.apm-ac-after-reading-answer {
background-color: #ffff88;
}
`);
/**
* key for localStorage to save ac-after-reading-answer state
* @type {string}
*/
const localStorageKey = "apm-hashset";
/**
* json string loaded from localStorage, or to save on localStorage
* @type {string}
*/
let json;
/**
* hashset to store whether the problem is marked as ac-after-reading-answer or not
* @type {Object}
*/
let hash;
/**
* user id of AtCoder
* @type {string}
*/
let userId;
/**
* load ac-after-reading-answer state from localStorage
*/
const loadHash = () => {
json = localStorage.getItem(localStorageKey);
hash = json ? JSON.parse(json) : {};
}
/**
* save ac-after-reading-answer state to localStorage
*/
const saveHash = () => {
json = JSON.stringify(hash);
localStorage.setItem(localStorageKey, json);
}
/**
* url of problem -> key of hash
*
* @param {string} href
* @returns {string | null} key of hash if valid url supplied, otherwise null
*/
const href2key = (href) => {
let result
if (result = href.match(/^https?:\/\/atcoder\.jp\/contests\/([^\/]+)\/tasks\/([^\/]+)$/)) {
return `${userId}/${result[1]}/${result[2]}`;
}
return null;
};
$.contextMenu({
selector: '.table-problem',
callback: (key, options) => {
switch (key) {
case "ac_after_reading_answer": {
const td = options.$trigger;
const href = td.find('a[href]').attr('href');
const key = href2key(href);
if (key in hash) {
delete hash[key];
} else {
hash[key] = 0;
}
td.toggleClass('apm-ac-after-reading-answer');
saveHash();
break;
}
case "about":
alert("解説ACした問題を Table ページ上でマークできます．マークした結果はブラウザに保存されます．");
}
},
items: {
"ac_after_reading_answer": { name: "解説AC On/Off" },
"sep1": "---------",
"about": { name: "About" }
}
});
/**
* Table 表示ページで "Show Accepted" の変更検知に利用する MutationObserver
*
* @type {MutationObserver}
*/
let tableObserver;
/**
* Table 表示ページで表のセルの色を塗り分ける．
*
* @date 2020-01-27
* @param {string} userId
*/
const processTable = () => {
const tableChanged = () => {
if (tableObserver) {
tableObserver.disconnect();
}
document.querySelectorAll('.table-problem').forEach(td => {
const lnk = td.querySelector('a[href]');
if (!lnk) {
return;
}
const key = href2key(lnk.href);
if (!key) {
return;
}
if (key in hash) {
td.classList.add('apm-ac-after-reading-answer');
}
});
if (tableObserver) {
document.querySelectorAll('.react-bs-container-body').forEach(div => {
tableObserver.observe(div, { childList: true, subtree: true });
});
}
};
tableObserver = new MutationObserver(mutations => tableChanged());
tableChanged();
document.querySelectorAll('.react-bs-container-body').forEach(div => {
tableObserver.observe(div, { childList: true, subtree: true });
});
}
/**
* ページ URL が変化した際のルートイベントハンドラ．
*
* @date 2020-01-27
*/
const hrefChanged = () => {
if (tableObserver) {
tableObserver.disconnect();
}
/** @type {RegExpMatchArray} */
let result;
if (result = location.href.match(/^https?:\/\/kenkoooo\.com\/atcoder\/#\/table\/([^/?#]+)/)) {
userId = result[1];
processTable();
}
};
// main
loadHash();
let href = location.href;
const observer = new MutationObserver(mutations => {
if (href === location.href) {
return;
}
// href changed
href = location.href;
hrefChanged();
});
observer.observe(document, { childList: true, subtree: true });
hrefChanged();
})();