BIT-乐学-编程题和测验状态.user.js

// ==UserScript==
// @name         BIT-乐学-编程题和测验状态
// @namespace    http://tampermonkey.net/
// @version      0.2.2
// @description  读取编程题状态并显示
// @license      GPL-3.0-or-later
// @supportURL   https://github.com/YDX-2147483647/BIT-enhanced/issues
// @author       Y.D.X.
// @match        https://lexue.bit.edu.cn/course/view.php*
// @grant        none
// ==/UserScript==

// 上一版本：BIT-Programming-编程题状态（0.1）。

(function () {
  'use strict'

  function add_style_sheet () {
    const sheet = document.createElement('style')
    sheet.innerHTML = `
        .problem-state-true::after,
        .quiz-state-true::after
        {
            content: " ✓";
            color: #00ff00;
        }

        .problem-state-false
        {
            font-weight: bold;
        }
        .problem-state-false::after
        {
            content: " ✗";
            color: red;
        }

        .problem-state-undefined::after
        {
            content: " ↻";
            color: purple;
        }

        .problem-state-null,
        .quiz-state-false
        {
            font-weight: bold;
        }
        .problem-state-null::after,
        .quiz-state-false::after
        {
            content: "（未）";
            color: skyblue;
        }
        `
    document.head.appendChild(sheet)
  }

  async function check_all_problems () {
    const problems = document.querySelectorAll("a[href*='lexue.bit.edu.cn/mod/programming/view']")
    for (const p of problems) {
      const state = await get_problem_state(get_URL_id(p.href))
      p.classList.add('problem-state-' + String(state))
    }
  }
  async function check_all_quizzes () {
    const quizzes = document.querySelectorAll("a[href*='lexue.bit.edu.cn/mod/quiz/view']")
    for (const q of quizzes) {
      const state = await get_quiz_state(q.href)
      q.classList.add('quiz-state-' + String(state))
    }
  }

  function get_URL_id (href) {
    const params = (new URL(href)).searchParams
    return params.get('id')
  }
  function get_problem_result_URL (problem_id) {
    return document.location.origin + '/mod/programming/result.php?' + `id=${problem_id}`
  }

  const parser = new DOMParser()

  /**
   * 获取编程题的情况
   * @param {String} problem_id 编程题的 id
   * @returns null 尚未提交
   * @returns undefined 正在排队或正在编译
   * @returns true 全部通过
   * @returns false 已提交但尚未全部通过
   */
  async function get_problem_state (problem_id) {
    const response = await fetch(get_problem_result_URL(problem_id))
    const response_text = await response.text()
    const doc = parser.parseFromString(response_text, 'text/html')

    const headings = doc.querySelectorAll('[role=main] > h3')
    if (headings[0].textContent === '查看程序的测试结果' &&
      headings[0].nextSibling.textContent === '找不到您的程序') {
      return null
    } else if (headings[headings.length - 1].textContent !== '测试结果') {
      return undefined
    } else {
      const result_text = doc.querySelector('#test-result-detail > p:first-child').textContent
      const result = result_text.match(/测试结果：共 (?<total>\d+) 个测试用例，您的程序通过了其中的 (?<accepted>\d+) 个，未能通过的有 (?<rejected>\d+) 个。/).groups
      for (const i in result) {
        result[i] = parseInt(result[i])
      }

      return result.rejected === 0
    }
  }

  /**
   * 获取测验的情况
   * @param {String} href 测验的 URL
   * @returns true 已完成
   * @returns false 未完成
   */
  async function get_quiz_state (href) {
    const response = await fetch(href)
    const response_text = await response.text()
    const doc = parser.parseFromString(response_text, 'text/html')

    const heading = doc.querySelector('[role=main] > h3')
    return heading !== null && heading.textContent === '您上次尝试的概要'
  }

  add_style_sheet()
  check_all_problems()
  check_all_quizzes()
})()