AtCoderの入出力を取得

getExampleCases.user.js

// ==UserScript==
// @name        getExampleCases
// @namespace   what_alnk
// @description AtCoderの入力例と出力例をコピーするボタンを設置する
// @include     /^http://[0-9a-zA-Z]+\.contest\.atcoder\.jp/tasks/[A-D]/
// @version     1.2
// @grant       none
// ==/UserScript==

// 通知許可確認
Notification.requestPermission();

// 通知
var showMessage = function (msg) {
  var n = new Notification(msg);
  setTimeout(n.close.bind(n), 2000); 
}

// 入力例（出力例）探す
var allParts = document.getElementsByClassName('part');
var exampleCases = new Array;
var reInput = /入力例/;
var reOutput = /出力例/;
Array.prototype.forEach.call(allParts, function (item1) {
  var h3Elements = item1.getElementsByTagName('h3');
  Array.prototype.forEach.call(h3Elements, function (item2) {
    if (reInput.test(item2.textContent) || reOutput.test(item2.textContent)) {
      exampleCases.push(item2);
    }
  })
})
// 入力例（出力例）コピー
var copyExampleCase = function () {
  var range = document.createRange();
  range.selectNode(this.parentNode.getElementsByTagName('pre') [0]);
  window.getSelection().addRange(range);
  try {
    document.execCommand('copy');
    showMessage('コピーしました．');
  } catch (e) {
    console.log('Copy error');
  }
  window.getSelection().removeAllRanges();
}

// ボタン定義
var copyButton = document.createElement('div');
var copyButton_content = document.createElement('button');
copyButton_content.textContent = 'Copy';
copyButton_content.style.marginBottom = '3px';
copyButton.appendChild(copyButton_content);
copyButton.style.display = 'inline-block';
copyButton.className = 'inputOutputExampleCopy';

// ボタン設置
Array.prototype.forEach.call(exampleCases, function (item) {
  var copyButton_clone = copyButton.cloneNode(true);
  copyButton_clone.addEventListener('click', copyExampleCase);
  h3Node = item;
  h3Node_parent = item.parentNode;
  h3Node_parent.insertBefore(copyButton_clone, h3Node.nextSibling);
})

Installation

• https://gist.github.com/whatalnk/14d4fd863594ac94373b/raw/getExampleCases.user.js