// ==UserScript==
// @name         替换多个文本
// @namespace    https://viayoo.com/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @run-at       document-start
// @match        https://*/*
// @grant        none
// ==/UserScript==


var isReplacing = false;
var replaceMap = new Map();
var originalTextMap = new Map();

function replaceTextInDocument(node) {
  if (node.nodeType === Node.TEXT_NODE) {
    if (!originalTextMap.has(node)) {
      originalTextMap.set(node, node.textContent);
    }
    if (isReplacing) {
      var newText = originalTextMap.get(node);
      replaceMap.forEach((replacement, original) => {
        newText = newText.replace(new RegExp(original, 'g'), replacement);
      });
      node.textContent = newText;
    } else {
      node.textContent = originalTextMap.get(node);
    }
  } else if (node.nodeType === Node.ELEMENT_NODE) {
    for (var i = 0; i < node.childNodes.length; i++) {
      replaceTextInDocument(node.childNodes[i]);
    }
  }
}

function openReplaceDialog() {
  var replaceInput = prompt('请输入要替换的多个词组及其对应的替换内容，格式：原词组1=替换内容1, 原词组2=替换内容2, ...');
  if (replaceInput !== null) {
    replaceInput = replaceInput.trim();
    if (replaceInput === '') {
      return;
    }
    replaceMap.clear();
    var replaces = replaceInput.split(',');
    replaces.forEach((replace) => {
      var parts = replace.split('=');
      if (parts.length === 2) {
        var original = parts[0].trim();
        var replacement = parts[1].trim();
        replaceMap.set(original, replacement);
      }
    });
    isReplacing = true;
    replaceTextInDocument(document.body);
  } else {
    isReplacing = false;
    replaceTextInDocument(document.body);
  }
}

function addButton(icon, f) {
  var button = document.createElement('button');
  button.className = 'button';
  button.innerHTML = '替换文本';
  button.style.position = 'fixed';
  button.style.top = '10px';
  button.style.right = '10px';
  button.addEventListener('click', f);
  document.body.appendChild(button);
}

addButton('https://common.cnblogs.com/images/copycode.gif', openReplaceDialog);