suite.test('Pad empty with br', function () {
   const schema = Schema();
   const parser = DomParser({ padd_empty_with_br: true }, schema);
   const serializer = Serializer({ padd_empty_with_br: true }, schema);
   const root = parser.parse('<p>a</p><p></p>');
   LegacyUnit.equal(serializer.serialize(root), '<p>a</p><p><br /></p>');
 });

  suite.test('Sorting of attributes', function () {
    const serializer = Serializer();

    LegacyUnit.equal(
      serializer.serialize(DomParser().parse('<b class="class" id="id">x</b>')),
      '<strong id="id" class="class">x</strong>'
    );
  });

const dataToHtml = function (editor, data, head) {
  let headerFragment, headElement, html, elm, value;
  const dom = editor.dom;

  function setAttr(elm, name, value) {
    elm.attr(name, value ? value : undefined);
  }

  function addHeadNode(node) {
    if (headElement.firstChild) {
      headElement.insert(node, headElement.firstChild);
    } else {
      headElement.append(node);
    }
  }

  headerFragment = parseHeader(head);
  headElement = headerFragment.getAll('head')[0];
  if (!headElement) {
    elm = headerFragment.getAll('html')[0];
    headElement = new Node('head', 1);

    if (elm.firstChild) {
      elm.insert(headElement, elm.firstChild, true);
    } else {
      elm.append(headElement);
    }
  }

  // Add/update/remove XML-PI
  elm = headerFragment.firstChild;
  if (data.xml_pi) {
    value = 'version="1.0"';

    if (data.docencoding) {
      value += ' encoding="' + data.docencoding + '"';
    }

    if (elm.type !== 7) {
      elm = new Node('xml', 7);
      headerFragment.insert(elm, headerFragment.firstChild, true);
    }

    elm.value = value;
  } else if (elm && elm.type === 7) {
    elm.remove();
  }

  // Add/update/remove doctype
  elm = headerFragment.getAll('#doctype')[0];
  if (data.doctype) {
    if (!elm) {
      elm = new Node('#doctype', 10);

      if (data.xml_pi) {
        headerFragment.insert(elm, headerFragment.firstChild);
      } else {
        addHeadNode(elm);
      }
    }

    elm.value = data.doctype.substring(9, data.doctype.length - 1);
  } else if (elm) {
    elm.remove();
  }

  // Add meta encoding
  elm = null;
  Tools.each(headerFragment.getAll('meta'), function (meta) {
    if (meta.attr('http-equiv') === 'Content-Type') {
      elm = meta;
    }
  });

  if (data.docencoding) {
    if (!elm) {
      elm = new Node('meta', 1);
      elm.attr('http-equiv', 'Content-Type');
      elm.shortEnded = true;
      addHeadNode(elm);
    }

    elm.attr('content', 'text/html; charset=' + data.docencoding);
  } else if (elm) {
    elm.remove();
  }

  // Add/update/remove title
  elm = headerFragment.getAll('title')[0];
  if (data.title) {
    if (!elm) {
      elm = new Node('title', 1);
      addHeadNode(elm);
    } else {
      elm.empty();
    }

    elm.append(new Node('#text', 3)).value = data.title;
  } else if (elm) {
    elm.remove();
//.........这里部分代码省略.........

const filterWordContent = function (editor, content) {
  let retainStyleProperties, validStyles;

  retainStyleProperties = Settings.getRetainStyleProps(editor);
  if (retainStyleProperties) {
    validStyles = Tools.makeMap(retainStyleProperties.split(/[, ]/));
  }

  // Remove basic Word junk
  content = Utils.filter(content, [
    // Remove apple new line markers
    /<br class="?Apple-interchange-newline"?>/gi,

    // Remove google docs internal guid markers
    /<b[^>]+id="?docs-internal-[^>]*>/gi,

    // Word comments like conditional comments etc
    /<!--[\s\S]+?-->/gi,

    // Remove comments, scripts (e.g., msoShowComment), XML tag, VML content,
    // MS Office namespaced tags, and a few other tags
    /<(!|script[^>]*>.*?<\/script(?=[>\s])|\/?(\?xml(:\w+)?|img|meta|link|style|\w:\w+)(?=[\s\/>]))[^>]*>/gi,

    // Convert <s> into <strike> for line-though
    [/<(\/?)s>/gi, '<$1strike>'],

    // Replace nsbp entites to char since it's easier to handle
    [/&nbsp;/gi, '\u00a0'],

    // Convert <span style="mso-spacerun:yes">___</span> to string of alternating
    // breaking/non-breaking spaces of same length
    [/<span\s+style\s*=\s*"\s*mso-spacerun\s*:\s*yes\s*;?\s*"\s*>([\s\u00a0]*)<\/span>/gi,
      function (str, spaces) {
        return (spaces.length > 0) ?
          spaces.replace(/./, ' ').slice(Math.floor(spaces.length / 2)).split('').join('\u00a0') : '';
      }
    ]
  ]);

  const validElements = Settings.getWordValidElements(editor);

  // Setup strict schema
  const schema = Schema({
    valid_elements: validElements,
    valid_children: '-li[p]'
  });

  // Add style/class attribute to all element rules since the user might have removed them from
  // paste_word_valid_elements config option and we need to check them for properties
  Tools.each(schema.elements, function (rule) {
    /*eslint dot-notation:0*/
    if (!rule.attributes.class) {
      rule.attributes.class = {};
      rule.attributesOrder.push('class');
    }

    if (!rule.attributes.style) {
      rule.attributes.style = {};
      rule.attributesOrder.push('style');
    }
  });

  // Parse HTML into DOM structure
  const domParser = DomParser({}, schema);

  // Filter styles to remove "mso" specific styles and convert some of them
  domParser.addAttributeFilter('style', function (nodes) {
    let i = nodes.length, node;

    while (i--) {
      node = nodes[i];
      node.attr('style', filterStyles(editor, validStyles, node, node.attr('style')));

      // Remove pointess spans
      if (node.name === 'span' && node.parent && !node.attributes.length) {
        node.unwrap();
      }
    }
  });

  // Check the class attribute for comments or del items and remove those
  domParser.addAttributeFilter('class', function (nodes) {
    let i = nodes.length, node, className;

    while (i--) {
      node = nodes[i];

      className = node.attr('class');
      if (/^(MsoCommentReference|MsoCommentText|msoDel)$/i.test(className)) {
        node.remove();
      }

      node.attr('class', null);
    }
  });

  // Remove all del elements since we don't want the track changes code in the editor
  domParser.addNodeFilter('del', function (nodes) {
    let i = nodes.length;

//.........这里部分代码省略.........

 const toHtml = function (node) {
   const htmlSerializer = Serializer({});
   return htmlSerializer.serialize(node);
 };