jsonxmlformat/xmlformat.js at master · liuxianjin/jsonxmlformat · GitHub

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function formateXml(xmlStr) {
  var text = xmlStr;
  //使用replace去空格
  text =
    "\n" +
    text
      .replace(/(<\w+)(\s.*?>)/g, function ($0, name, props) {
        return name + " " + props.replace(/\s+(\w+=)/g, " $1");
      })
      .replace(/>\s*?</g, ">\n<");
  //处理注释
  text = text
    .replace(/\n/g, "\r")
    .replace(/<!--(.+?)-->/g, function ($0, text) {
      var ret = "<!--" + escape(text) + "-->";
      return ret;
    })
    .replace(/\r/g, "\n");
  //调整格式	以压栈方式递归调整缩进
  var rgx =
    /\n(<(([^\?]).+?)(?:\s|\s*?>|\s*?(\/)>)(?:.*?(?:(?:(\/)>)|(?:<(\/)\2>)))?)/gm;
  var nodeStack = [];
  var output = text.replace(
    rgx,
    function (
      $0,
      all,
      name,
      isBegin,
      isCloseFull1,
      isCloseFull2,
      isFull1,
      isFull2
    ) {
      var isClosed =
        isCloseFull1 == "/" ||
        isCloseFull2 == "/" ||
        isFull1 == "/" ||
        isFull2 == "/";
      var prefix = "";
      if (isBegin == "!") {
        //!开头
        prefix = setPrefix(nodeStack.length);
      } else {
        if (isBegin != "/") {
          ///开头
          prefix = setPrefix(nodeStack.length);
          if (!isClosed) {
            //非关闭标签
            nodeStack.push(name);
          }
        } else {
          nodeStack.pop(); //弹栈
          prefix = setPrefix(nodeStack.length);
        }
      }
      var ret = "\n" + prefix + all;
      return ret;
    }
  );
  var prefixSpace = -1;
  var outputText = output.substring(1);
  //还原注释内容
  outputText = outputText
    .replace(/\n/g, "\r")
    .replace(/(\s*)<!--(.+?)-->/g, function ($0, prefix, text) {
      if (prefix.charAt(0) == "\r") prefix = prefix.substring(1);
      text = unescape(text).replace(/\r/g, "\n");
      var ret = "\n" + prefix + "<!--" + text.replace(/^\s*/gm, prefix) + "-->";
      return ret;
    });
  outputText = outputText.replace(/\s+$/g, "").replace(/\r/g, "\r\n");
  return outputText;
}

//计算头函数	用来缩进
function setPrefix(prefixIndex) {
  var result = "";
  var span = "    "; //缩进长度
  var output = [];
  for (var i = 0; i < prefixIndex; ++i) {
    output.push(span);
  }
  result = output.join("");
  return result;
}