dreamland/lib/mp-html/parser.js

"use strict";

/**
 * @fileoverview html 解析器
 */
// 配置
var config = {
  // 信任的标签（保持标签名不变）
  trustTags: makeMap('a,abbr,ad,audio,b,blockquote,br,code,col,colgroup,dd,del,dl,dt,div,em,fieldset,h1,h2,h3,h4,h5,h6,hr,i,img,ins,label,legend,li,ol,p,q,ruby,rt,source,span,strong,sub,sup,table,tbody,td,tfoot,th,thead,tr,title,ul,video'),
  // 块级标签（转为 div，其他的非信任标签转为 span）
  blockTags: makeMap('address,article,aside,body,caption,center,cite,footer,header,html,nav,pre,section'),
  // 要移除的标签
  ignoreTags: makeMap('area,base,canvas,embed,frame,head,iframe,input,link,map,meta,param,rp,script,source,style,textarea,title,track,wbr'),
  // 自闭合的标签
  voidTags: makeMap('area,base,br,col,circle,ellipse,embed,frame,hr,img,input,line,link,meta,param,path,polygon,rect,source,track,use,wbr'),
  // html 实体
  entities: {
    lt: '<',
    gt: '>',
    quot: '"',
    apos: "'",
    ensp: "\u2002",
    emsp: "\u2003",
    nbsp: '\xA0',
    semi: ';',
    ndash: '–',
    mdash: '—',
    middot: '·',
    lsquo: '‘',
    rsquo: '’',
    ldquo: '“',
    rdquo: '”',
    bull: '•',
    hellip: '…'
  },
  // 默认的标签样式
  tagStyle: {
    // #ifndef APP-PLUS-NVUE
    address: 'font-style:italic',
    big: 'display:inline;font-size:1.2em',
    caption: 'display:table-caption;text-align:center',
    center: 'text-align:center',
    cite: 'font-style:italic',
    dd: 'margin-left:40px',
    mark: 'background-color:yellow',
    pre: 'font-family:monospace;white-space:pre',
    s: 'text-decoration:line-through',
    small: 'display:inline;font-size:0.8em',
    u: 'text-decoration:underline' // #endif

  }
};
var windowWidth = uni.getSystemInfoSync().windowWidth;
var blankChar = makeMap(' ,\r,\n,\t,\f');
var idIndex = 0; // #ifdef H5 || APP-PLUS

config.ignoreTags.iframe = void 0;
config.trustTags.iframe = true;
config.ignoreTags.embed = void 0;
config.trustTags.embed = true; // #endif
// #ifdef APP-PLUS-NVUE

config.ignoreTags.source = void 0;
config.ignoreTags.style = void 0; // #endif

/**
 * @description 创建 map
 * @param {String} str 逗号分隔
 */

function makeMap(str) {
  var map = Object.create(null),
      list = str.split(',');

  for (var i = list.length; i--;) {
    map[list[i]] = true;
  }

  return map;
}
/**
 * @description 解码 html 实体
 * @param {String} str 要解码的字符串
 * @param {Boolean} amp 要不要解码 &amp;
 * @returns {String} 解码后的字符串
 */


function decodeEntity(str, amp) {
  var i = str.indexOf('&');

  while (i != -1) {
    var j = str.indexOf(';', i + 3),
        code = void 0;
    if (j == -1) break;

    if (str[i + 1] == '#') {
      // &#123; 形式的实体
      code = parseInt((str[i + 2] == 'x' ? '0' : '') + str.substring(i + 2, j));
      if (!isNaN(code)) str = str.substr(0, i) + String.fromCharCode(code) + str.substr(j + 1);
    } else {
      // &nbsp; 形式的实体
      code = str.substring(i + 1, j);
      if (config.entities[code] || code == 'amp' && amp) str = str.substr(0, i) + (config.entities[code] || '&') + str.substr(j + 1);
    }

    i = str.indexOf('&', i + 1);
  }

  return str;
}
/**
 * @description html 解析器
 * @param {Object} vm 组件实例
 */


function parser(vm) {
  this.options = vm || {};
  this.tagStyle = Object.assign(config.tagStyle, this.options.tagStyle);
  this.imgList = vm.imgList || [];
  this.plugins = vm.plugins || [];
  this.attrs = Object.create(null);
  this.stack = [];
  this.nodes = [];
}
/**
 * @description 执行解析
 * @param {String} content 要解析的文本
 */


parser.prototype.parse = function (content) {
  // 插件处理
  for (var i = this.plugins.length; i--;) {
    if (this.plugins[i].onUpdate) content = this.plugins[i].onUpdate(content, config) || content;
  }

  new lexer(this).parse(content); // 出栈未闭合的标签

  while (this.stack.length) {
    this.popNode();
  }

  return this.nodes;
};
/**
 * @description 将标签暴露出来（不被 rich-text 包含）
 */


parser.prototype.expose = function () {
  // #ifndef APP-PLUS-NVUE
  for (var i = this.stack.length; i--;) {
    var item = this.stack[i];
    if (item.name == 'a' || item.c) return;
    item.c = 1;
  } // #endif

};
/**
 * @description 处理插件
 * @param {Object} node 要处理的标签
 * @returns {Boolean} 是否要移除此标签
 */


parser.prototype.hook = function (node) {
  for (var i = this.plugins.length; i--;) {
    if (this.plugins[i].onParse && this.plugins[i].onParse(node, this) == false) return false;
  }

  return true;
};
/**
 * @description 将链接拼接上主域名
 * @param {String} url 需要拼接的链接
 * @returns {String} 拼接后的链接
 */


parser.prototype.getUrl = function (url) {
  var domain = this.options.domain;

  if (url[0] == '/') {
    // // 开头的补充协议名
    if (url[1] == '/') url = (domain ? domain.split('://')[0] : 'http') + ':' + url; // 否则补充整个域名
    else if (domain) url = domain + url;
  } else if (domain && !url.includes('data:') && !url.includes('://')) url = domain + '/' + url;

  return url;
};
/**
 * @description 解析样式表
 * @param {Object} node 标签
 * @returns {Object} 
 */


parser.prototype.parseStyle = function (node) {
  var attrs = node.attrs,
      list = (this.tagStyle[node.name] || '').split(';').concat((attrs.style || '').split(';')),
      styleObj = {},
      tmp = '';

  if (attrs.id) {
    // 暴露锚点
    if (this.options.useAnchor) this.expose();else if (node.name != 'img' && node.name != 'a' && node.name != 'video' && node.name != 'audio') attrs.id = void 0;
  } // 转换 width 和 height 属性


  if (attrs.width) {
    styleObj.width = parseFloat(attrs.width) + (attrs.width.includes('%') ? '%' : 'px');
    attrs.width = void 0;
  }

  if (attrs.height) {
    styleObj.height = parseFloat(attrs.height) + (attrs.height.includes('%') ? '%' : 'px');
    attrs.height = void 0;
  }

  for (var i = 0, len = list.length; i < len; i++) {
    var info = list[i].split(':');
    if (info.length < 2) continue;
    var key = info.shift().trim().toLowerCase(),
        value = info.join(':').trim(); // 兼容性的 css 不压缩

    if (value[0] == '-' && value.lastIndexOf('-') > 0 || value.includes('safe')) tmp += ";".concat(key, ":").concat(value); // 重复的样式进行覆盖
    else if (!styleObj[key] || value.includes('import') || !styleObj[key].includes('import')) {
        // 填充链接
        if (value.includes('url')) {
          var j = value.indexOf('(') + 1;

          if (j) {
            while (value[j] == '"' || value[j] == "'" || blankChar[value[j]]) {
              j++;
            }

            value = value.substr(0, j) + this.getUrl(value.substr(j));
          }
        } // 转换 rpx（rich-text 内部不支持 rpx）
        else if (value.includes('rpx')) value = value.replace(/[0-9.]+\s*rpx/g, function ($) {
            return parseFloat($) * windowWidth / 750 + 'px';
          });

        styleObj[key] = value;
      }
  }

  node.attrs.style = tmp;
  return styleObj;
};
/**
 * @description 解析到标签名
 * @param {String} name 标签名
 * @private
 */


parser.prototype.onTagName = function (name) {
  this.tagName = this.xml ? name : name.toLowerCase();
  if (this.tagName == 'svg') this.xml = true; // svg 标签内大小写敏感
};
/**
 * @description 解析到属性名
 * @param {String} name 属性名
 * @private
 */


parser.prototype.onAttrName = function (name) {
  name = this.xml ? name : name.toLowerCase();

  if (name.substr(0, 5) == 'data-') {
    // data-src 自动转为 src
    if (name == 'data-src' && !this.attrs.src) this.attrName = 'src'; // a 和 img 标签保留 data- 的属性，可以在 imgtap 和 linktap 事件中使用
    else if (this.tagName == 'img' || this.tagName == 'a') this.attrName = name; // 剩余的移除以减小大小
      else this.attrName = void 0;
  } else {
    this.attrName = name;
    this.attrs[name] = 'T'; // boolean 型属性缺省设置
  }
};
/**
 * @description 解析到属性值
 * @param {String} val 属性值
 * @private
 */


parser.prototype.onAttrVal = function (val) {
  var name = this.attrName || ''; // 部分属性进行实体解码

  if (name == 'style' || name == 'href') this.attrs[name] = decodeEntity(val, true); // 拼接主域名
  else if (name.includes('src')) this.attrs[name] = this.getUrl(decodeEntity(val, true));else if (name) this.attrs[name] = val;
};
/**
 * @description 解析到标签开始
 * @param {Boolean} selfClose 是否有自闭合标识 />
 * @private
 */


parser.prototype.onOpenTag = function (selfClose) {
  // 拼装 node
  var node = Object.create(null);
  node.name = this.tagName;
  node.attrs = this.attrs;
  this.attrs = Object.create(null);
  var attrs = node.attrs,
      parent = this.stack[this.stack.length - 1],
      siblings = parent ? parent.children : this.nodes,
      close = this.xml ? selfClose : config.voidTags[node.name]; // 转换 embed 标签

  if (node.name == 'embed') {
    // #ifndef H5 || APP-PLUS
    var src = attrs.src || ''; // 按照后缀名和 type 将 embed 转为 video 或 audio

    if (src.includes('.mp4') || src.includes('.3gp') || src.includes('.m3u8') || (attrs.type || '').includes('video')) node.name = 'video';else if (src.includes('.mp3') || src.includes('.wav') || src.includes('.aac') || src.includes('.m4a') || (attrs.type || '').includes('audio')) node.name = 'audio';
    if (attrs.autostart) attrs.autoplay = 'T';
    attrs.controls = 'T'; // #endif
    // #ifdef H5 || APP-PLUS

    this.expose(); // #endif
  } // #ifndef APP-PLUS-NVUE
  // 处理音视频


  if (node.name == 'video' || node.name == 'audio') {
    // 设置 id 以便获取 context
    if (node.name == 'video' && !attrs.id) attrs.id = 'v' + idIndex++; // 没有设置 controls 也没有设置 autoplay 的自动设置 controls

    if (!attrs.controls && !attrs.autoplay) attrs.controls = 'T'; // 用数组存储所有可用的 source

    node.src = [];

    if (attrs.src) {
      node.src.push(attrs.src);
      attrs.src = void 0;
    }

    this.expose();
  } // #endif
  // 处理自闭合标签


  if (close) {
    if (!this.hook(node) || config.ignoreTags[node.name]) {
      // 通过 base 标签设置主域名
      if (node.name == 'base' && !this.options.domain) this.options.domain = attrs.href; // #ifndef APP-PLUS-NVUE
      // 设置 source 标签（仅父节点为 video 或 audio 时有效）
      else if (node.name == 'source' && parent && (parent.name == 'video' || parent.name == 'audio') && attrs.src) parent.src.push(attrs.src); // #endif

      return;
    } // 解析 style


    var styleObj = this.parseStyle(node); // 处理图片

    if (node.name == 'img') {
      if (attrs.src) {
        // 标记 webp
        if (attrs.src.includes('webp')) node.webp = 'T'; // data url 图片如果没有设置 original-src 默认为不可预览的小图片

        if (attrs.src.includes('data:') && !attrs['original-src']) attrs.ignore = 'T';

        if (!attrs.ignore || node.webp || attrs.src.includes('cloud://')) {
          for (var i = this.stack.length; i--;) {
            var item = this.stack[i];

            if (item.name == 'a') {
              node.a = item.attrs;
              break;
            } // #ifndef H5 || APP-PLUS


            var style = item.attrs.style || '';

            if (style.includes('flex:') && !style.includes('flex:0') && !style.includes('flex: 0') && (!styleObj.width || !styleObj.width.includes('%'))) {
              styleObj.width = '100% !important';
              styleObj.height = '';

              for (var j = i + 1; j < this.stack.length; j++) {
                this.stack[j].attrs.style = (this.stack[j].attrs.style || '').replace('inline-', '');
              }
            } else if (style.includes('flex') && styleObj.width == '100%') {
              for (var _j = i + 1; _j < this.stack.length; _j++) {
                var _style = this.stack[_j].attrs.style || '';

                if (!_style.includes(';width') && !_style.includes(' width') && _style.indexOf('width') != 0) {
                  styleObj.width = '';
                  break;
                }
              }
            } else if (style.includes('inline-block')) {
              if (styleObj.width && styleObj.width[styleObj.width.length - 1] == '%') {
                item.attrs.style += ';max-width:' + styleObj.width;
                styleObj.width = '';
              } else item.attrs.style += ';max-width:100%';
            } // #endif


            item.c = 1;
          }

          attrs.i = this.imgList.length.toString();

          var _src = attrs['original-src'] || attrs.src; // #ifndef H5 || MP-ALIPAY || APP-PLUS || MP-360


          if (this.imgList.includes(_src)) {
            // 如果有重复的链接则对域名进行随机大小写变换避免预览时错位
            var _i = _src.indexOf('://');

            if (_i != -1) {
              _i += 3;

              var newSrc = _src.substr(0, _i);

              for (; _i < _src.length; _i++) {
                if (_src[_i] == '/') break;
                newSrc += Math.random() > 0.5 ? _src[_i].toUpperCase() : _src[_i];
              }

              newSrc += _src.substr(_i);
              _src = newSrc;
            }
          } // #endif


          this.imgList.push(_src); // #ifdef H5 || APP-PLUS

          if (this.options.lazyLoad) {
            attrs['data-src'] = attrs.src;
            attrs.src = void 0;
          } // #endif

        }
      }

      if (styleObj.display == 'inline') styleObj.display = ''; // #ifndef APP-PLUS-NVUE

      if (attrs.ignore) {
        styleObj['max-width'] = styleObj['max-width'] || '100%';
        attrs.style += ';-webkit-touch-callout:none';
      } // #endif
      // 设置的宽度超出屏幕，为避免变形，高度转为自动


      if (parseInt(styleObj.width) > windowWidth) styleObj.height = void 0; // 记录是否设置了宽高

      if (styleObj.width) {
        if (styleObj.width.includes('auto')) styleObj.width = '';else {
          node.w = 'T';
          if (styleObj.height && !styleObj.height.includes('auto')) node.h = 'T';
        }
      }
    } else if (node.name == 'svg') {
      siblings.push(node);
      this.stack.push(node);
      this.popNode();
      return;
    }

    for (var key in styleObj) {
      if (styleObj[key]) attrs.style += ";".concat(key, ":").concat(styleObj[key].replace(' !important', ''));
    }

    attrs.style = attrs.style.substr(1) || void 0;
  } else {
    if (node.name == 'pre' || (attrs.style || '').includes('white-space') && attrs.style.includes('pre')) this.pre = node.pre = true;
    node.children = [];
    this.stack.push(node);
  } // 加入节点树


  siblings.push(node);
};
/**
 * @description 解析到标签结束
 * @param {String} name 标签名
 * @private
 */


parser.prototype.onCloseTag = function (name) {
  // 依次出栈到匹配为止
  name = this.xml ? name : name.toLowerCase();
  var i;

  for (i = this.stack.length; i--;) {
    if (this.stack[i].name == name) break;
  }

  if (i != -1) {
    while (this.stack.length > i) {
      this.popNode();
    }
  } else if (name == 'p' || name == 'br') {
    var siblings = this.stack.length ? this.stack[this.stack.length - 1].children : this.nodes;
    siblings.push({
      name: name,
      attrs: {}
    });
  }
};
/**
 * @description 处理标签出栈
 * @private
 */


parser.prototype.popNode = function () {
  var node = this.stack.pop(),
      attrs = node.attrs,
      children = node.children,
      parent = this.stack[this.stack.length - 1],
      siblings = parent ? parent.children : this.nodes;

  if (!this.hook(node) || config.ignoreTags[node.name]) {
    // 获取标题
    if (node.name == 'title' && children.length && children[0].type == 'text' && this.options.setTitle) uni.setNavigationBarTitle({
      title: children[0].text
    });
    siblings.pop();
    return;
  }

  if (node.pre) {
    // 是否合并空白符标识
    node.pre = this.pre = void 0;

    for (var i = this.stack.length; i--;) {
      if (this.stack[i].pre) this.pre = true;
    }
  }

  var styleObj = {}; // 转换 svg

  if (node.name == 'svg') {
    // #ifndef APP-PLUS-NVUE
    var src = '',
        style = attrs.style;
    attrs.style = '';
    attrs.xmlns = 'http://www.w3.org/2000/svg';

    (function traversal(node) {
      src += '<' + node.name;

      for (var item in node.attrs) {
        var val = node.attrs[item];

        if (val) {
          if (item == 'viewbox') item = 'viewBox';
          src += " ".concat(item, "=\"").concat(val, "\"");
        }
      }

      if (!node.children) src += '/>';else {
        src += '>';

        for (var _i2 = 0; _i2 < node.children.length; _i2++) {
          traversal(node.children[_i2]);
        }

        src += '</' + node.name + '>';
      }
    })(node);

    node.name = 'img';
    node.attrs = {
      src: 'data:image/svg+xml;utf8,' + src.replace(/#/g, '%23'),
      style: style,
      ignore: 'T'
    };
    node.children = void 0; // #endif

    this.xml = false;
    return;
  } // #ifndef APP-PLUS-NVUE
  // 转换 align 属性


  if (attrs.align) {
    if (node.name == 'table') {
      if (attrs.align == 'center') styleObj['margin-inline-start'] = styleObj['margin-inline-end'] = 'auto';else styleObj["float"] = attrs.align;
    } else styleObj['text-align'] = attrs.align;

    attrs.align = void 0;
  } // 转换 font 标签的属性


  if (node.name == 'font') {
    if (attrs.color) {
      styleObj.color = attrs.color;
      attrs.color = void 0;
    }

    if (attrs.face) {
      styleObj['font-family'] = attrs.face;
      attrs.face = void 0;
    }

    if (attrs.size) {
      var size = parseInt(attrs.size);

      if (!isNaN(size)) {
        if (size < 1) size = 1;else if (size > 7) size = 7;
        styleObj['font-size'] = ['xx-small', 'x-small', 'small', 'medium', 'large', 'x-large', 'xx-large'][size - 1];
      }

      attrs.size = void 0;
    }
  } // #endif
  // 一些编辑器的自带 class


  if ((attrs["class"] || '').includes('align-center')) styleObj['text-align'] = 'center';
  Object.assign(styleObj, this.parseStyle(node));

  if (parseInt(styleObj.width) > windowWidth) {
    styleObj['max-width'] = '100%';
    styleObj['box-sizing'] = 'border-box';
  } // #ifndef APP-PLUS-NVUE


  if (config.blockTags[node.name]) node.name = 'div'; // 未知标签转为 span，避免无法显示
  else if (!config.trustTags[node.name] && !this.xml) node.name = 'span';
  if (node.name == 'a' || node.name == 'ad' // #ifdef H5 || APP-PLUS
  || node.name == 'iframe' // #endif
  ) this.expose(); // #ifdef APP-PLUS
  else if (node.name == 'video') {
      var str = '<video style="width:100%;height:100%"'; // 空白图占位

      if (!attrs.poster && !attrs.autoplay) attrs.poster = "data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg'/>";

      for (var item in attrs) {
        if (attrs[item]) str += ' ' + item + '="' + attrs[item] + '"';
      }

      if (this.options.pauseVideo) str += ' onplay="for(var e=document.getElementsByTagName(\'video\'),t=0;t<e.length;t++)e[t]!=this&&e[t].pause()"';
      str += '>';

      for (var _i3 = 0; _i3 < node.src.length; _i3++) {
        str += '<source src="' + node.src[_i3] + '">';
      }

      str += '</video>';
      node.html = str;
    } // #endif
    // 列表处理
    else if ((node.name == 'ul' || node.name == 'ol') && node.c) {
        var types = {
          a: 'lower-alpha',
          A: 'upper-alpha',
          i: 'lower-roman',
          I: 'upper-roman'
        };

        if (types[attrs.type]) {
          attrs.style += ';list-style-type:' + types[attrs.type];
          attrs.type = void 0;
        }

        for (var _i4 = children.length; _i4--;) {
          if (children[_i4].name == 'li') children[_i4].c = 1;
        }
      } // 表格处理
      else if (node.name == 'table') {
          // cellpadding、cellspacing、border 这几个常用表格属性需要通过转换实现
          var padding = parseFloat(attrs.cellpadding),
              spacing = parseFloat(attrs.cellspacing),
              border = parseFloat(attrs.border);

          if (node.c) {
            // padding 和 spacing 默认 2
            if (isNaN(padding)) padding = 2;
            if (isNaN(spacing)) spacing = 2;
          }

          if (border) attrs.style += ';border:' + border + 'px solid gray';

          if (node.flag && node.c) {
            // 有 colspan 或 rowspan 且含有链接的表格通过 grid 布局实现
            styleObj.display = 'grid';

            if (spacing) {
              styleObj['grid-gap'] = spacing + 'px';
              styleObj.padding = spacing + 'px';
            } // 无间隔的情况下避免边框重叠
            else if (border) attrs.style += ';border-left:0;border-top:0';

            var width = [],
                // 表格的列宽
            trList = [],
                // tr 列表
            cells = [],
                // 保存新的单元格
            map = {}; // 被合并单元格占用的格子

            (function traversal(nodes) {
              for (var _i5 = 0; _i5 < nodes.length; _i5++) {
                if (nodes[_i5].name == 'tr') trList.push(nodes[_i5]);else traversal(nodes[_i5].children || []);
              }
            })(children);

            for (var row = 1; row <= trList.length; row++) {
              var col = 1;

              for (var j = 0; j < trList[row - 1].children.length; j++, col++) {
                var td = trList[row - 1].children[j];

                if (td.name == 'td' || td.name == 'th') {
                  // 这个格子被上面的单元格占用，则列号++
                  while (map[row + '.' + col]) {
                    col++;
                  }

                  var _style2 = td.attrs.style || '',
                      start = _style2.indexOf('width') ? _style2.indexOf(';width') : 0; // 提取出 td 的宽度


                  if (start != -1) {
                    var end = _style2.indexOf(';', start + 6);

                    if (end == -1) end = _style2.length;
                    if (!td.attrs.colspan) width[col] = _style2.substring(start ? start + 7 : 6, end);
                    _style2 = _style2.substr(0, start) + _style2.substr(end);
                  }

                  _style2 += (border ? ";border:".concat(border, "px solid gray") + (spacing ? '' : ';border-right:0;border-bottom:0') : '') + (padding ? ";padding:".concat(padding, "px") : ''); // 处理列合并

                  if (td.attrs.colspan) {
                    _style2 += ";grid-column-start:".concat(col, ";grid-column-end:").concat(col + parseInt(td.attrs.colspan));
                    if (!td.attrs.rowspan) _style2 += ";grid-row-start:".concat(row, ";grid-row-end:").concat(row + 1);
                    col += parseInt(td.attrs.colspan) - 1;
                  } // 处理行合并


                  if (td.attrs.rowspan) {
                    _style2 += ";grid-row-start:".concat(row, ";grid-row-end:").concat(row + parseInt(td.attrs.rowspan));
                    if (!td.attrs.colspan) _style2 += ";grid-column-start:".concat(col, ";grid-column-end:").concat(col + 1); // 记录下方单元格被占用

                    for (var k = 1; k < td.attrs.rowspan; k++) {
                      map[row + k + '.' + col] = 1;
                    }
                  }

                  if (_style2) td.attrs.style = _style2;
                  cells.push(td);
                }
              }

              if (row == 1) {
                var temp = '';

                for (var _i6 = 1; _i6 < col; _i6++) {
                  temp += (width[_i6] ? width[_i6] : 'auto') + ' ';
                }

                styleObj['grid-template-columns'] = temp;
              }
            }

            node.children = cells;
          } else {
            // 没有使用合并单元格的表格通过 table 布局实现
            if (node.c) styleObj.display = 'table';
            if (!isNaN(spacing)) styleObj['border-spacing'] = spacing + 'px';

            if (border || padding) {
              // 遍历
              (function traversal(nodes) {
                for (var _i7 = 0; _i7 < nodes.length; _i7++) {
                  var _td = nodes[_i7];

                  if (_td.name == 'th' || _td.name == 'td') {
                    if (border) _td.attrs.style = "border:".concat(border, "px solid gray;").concat(_td.attrs.style || '');
                    if (padding) _td.attrs.style = "padding:".concat(padding, "px;").concat(_td.attrs.style || '');
                  } else if (_td.children) traversal(_td.children);
                }
              })(children);
            }
          } // 给表格添加一个单独的横向滚动层


          if (this.options.scrollTable && !(attrs.style || '').includes('inline')) {
            var table = Object.assign({}, node);
            node.name = 'div';
            node.attrs = {
              style: 'overflow:auto'
            };
            node.children = [table];
            attrs = table.attrs;
          }
        } else if ((node.name == 'td' || node.name == 'th') && (attrs.colspan || attrs.rowspan)) {
          for (var _i8 = this.stack.length; _i8--;) {
            if (this.stack[_i8].name == 'table') {
              this.stack[_i8].flag = 1; // 指示含有合并单元格

              break;
            }
          }
        } // 转换 ruby
        else if (node.name == 'ruby') {
            node.name = 'span';

            for (var _i9 = 0; _i9 < children.length - 1; _i9++) {
              if (children[_i9].type == 'text' && children[_i9 + 1].name == 'rt') {
                children[_i9] = {
                  name: 'div',
                  attrs: {
                    style: 'display:inline-block'
                  },
                  children: [{
                    name: 'div',
                    attrs: {
                      style: 'font-size:50%;text-align:start'
                    },
                    children: children[_i9 + 1].children
                  }, children[_i9]]
                };
                children.splice(_i9 + 1, 1);
              }
            }
          } else if (node.c) {
            node.c = 2;

            for (var _i10 = node.children.length; _i10--;) {
              if (!node.children[_i10].c || node.children[_i10].name == 'table') node.c = 1;
            }
          }
  if ((styleObj.display || '').includes('flex') && !node.c) for (var _i11 = children.length; _i11--;) {
    var _item = children[_i11];

    if (_item.f) {
      _item.attrs.style = (_item.attrs.style || '') + _item.f;
      _item.f = void 0;
    }
  } // flex 布局时部分样式需要提取到 rich-text 外层

  var flex = parent && (parent.attrs.style || '').includes('flex') // #ifdef MP-WEIXIN
  // 检查基础库版本 virtualHost 是否可用
  && !(node.c && wx.getNFCAdapter) // #endif
  // #ifndef MP-WEIXIN || MP-QQ || MP-BAIDU || MP-TOUTIAO
  && !node.c; // #endif

  if (flex) node.f = ';max-width:100%'; // #endif

  for (var key in styleObj) {
    if (styleObj[key]) {
      var val = ";".concat(key, ":").concat(styleObj[key].replace(' !important', '')); // #ifndef APP-PLUS-NVUE

      if (flex && (key.includes('flex') && key != 'flex-direction' || key == 'align-self' || styleObj[key][0] == '-' || key == 'width' && val.includes('%'))) {
        node.f += val;
        if (key == 'width') attrs.style += ';width:100%';
      } else // #endif
        attrs.style += val;
    }
  }

  attrs.style = attrs.style.substr(1) || void 0;
};
/**
 * @description 解析到文本
 * @param {String} text 文本内容
 */


parser.prototype.onText = function (text) {
  if (!this.pre) {
    // 合并空白符
    var trim = '',
        flag;

    for (var i = 0, len = text.length; i < len; i++) {
      if (!blankChar[text[i]]) trim += text[i];else {
        if (trim[trim.length - 1] != ' ') trim += ' ';
        if (text[i] == '\n' && !flag) flag = true;
      }
    } // 去除含有换行符的空串


    if (trim == ' ' && flag) return;
    text = trim;
  }

  var node = Object.create(null);
  node.type = 'text';
  node.text = decodeEntity(text);

  if (this.hook(node)) {
    var siblings = this.stack.length ? this.stack[this.stack.length - 1].children : this.nodes;
    siblings.push(node);
  }
};
/**
 * @description html 词法分析器
 * @param {Object} handler 高层处理器
 */


function lexer(handler) {
  this.handler = handler;
}
/**
 * @description 执行解析
 * @param {String} content 要解析的文本
 */


lexer.prototype.parse = function (content) {
  this.content = content || '';
  this.i = 0; // 标记解析位置

  this.start = 0; // 标记一个单词的开始位置

  this.state = this.text; // 当前状态

  for (var len = this.content.length; this.i != -1 && this.i < len;) {
    this.state();
  }
};
/**
 * @description 检查标签是否闭合
 * @param {String} method 如果闭合要进行的操作
 * @returns {Boolean} 是否闭合
 * @private
 */


lexer.prototype.checkClose = function (method) {
  var selfClose = this.content[this.i] == '/';

  if (this.content[this.i] == '>' || selfClose && this.content[this.i + 1] == '>') {
    if (method) this.handler[method](this.content.substring(this.start, this.i));
    this.i += selfClose ? 2 : 1;
    this.start = this.i;
    this.handler.onOpenTag(selfClose);

    if (this.handler.tagName == 'script') {
      this.i = this.content.indexOf('</', this.i);

      if (this.i != -1) {
        this.i += 2;
        this.start = this.i;
      }

      this.state = this.endTag;
    } else this.state = this.text;

    return true;
  }

  return false;
};
/**
 * @description 文本状态
 * @private
 */


lexer.prototype.text = function () {
  this.i = this.content.indexOf('<', this.i); // 查找最近的标签

  if (this.i == -1) {
    // 没有标签了
    if (this.start < this.content.length) this.handler.onText(this.content.substring(this.start, this.content.length));
    return;
  }

  var c = this.content[this.i + 1];

  if (c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z') {
    // 标签开头
    if (this.start != this.i) this.handler.onText(this.content.substring(this.start, this.i));
    this.start = ++this.i;
    this.state = this.tagName;
  } else if (c == '/' || c == '!' || c == '?') {
    if (this.start != this.i) this.handler.onText(this.content.substring(this.start, this.i));
    var next = this.content[this.i + 2];

    if (c == '/' && (next >= 'a' && next <= 'z' || next >= 'A' && next <= 'Z')) {
      // 标签结尾
      this.i += 2;
      this.start = this.i;
      return this.state = this.endTag;
    } // 处理注释


    var end = '-->';
    if (c != '!' || this.content[this.i + 2] != '-' || this.content[this.i + 3] != '-') end = '>';
    this.i = this.content.indexOf(end, this.i);

    if (this.i != -1) {
      this.i += end.length;
      this.start = this.i;
    }
  } else this.i++;
};
/**
 * @description 标签名状态
 * @private
 */


lexer.prototype.tagName = function () {
  if (blankChar[this.content[this.i]]) {
    // 解析到标签名
    this.handler.onTagName(this.content.substring(this.start, this.i));

    while (blankChar[this.content[++this.i]]) {
      ;
    }

    if (this.i < this.content.length && !this.checkClose()) {
      this.start = this.i;
      this.state = this.attrName;
    }
  } else if (!this.checkClose('onTagName')) this.i++;
};
/**
 * @description 属性名状态
 * @private
 */


lexer.prototype.attrName = function () {
  var c = this.content[this.i];

  if (blankChar[c] || c == '=') {
    // 解析到属性名
    this.handler.onAttrName(this.content.substring(this.start, this.i));
    var needVal = c == '=',
        len = this.content.length;

    while (++this.i < len) {
      c = this.content[this.i];

      if (!blankChar[c]) {
        if (this.checkClose()) return;

        if (needVal) {
          // 等号后遇到第一个非空字符
          this.start = this.i;
          return this.state = this.attrVal;
        }

        if (this.content[this.i] == '=') needVal = true;else {
          this.start = this.i;
          return this.state = this.attrName;
        }
      }
    }
  } else if (!this.checkClose('onAttrName')) this.i++;
};
/**
 * @description 属性值状态
 * @private
 */


lexer.prototype.attrVal = function () {
  var c = this.content[this.i],
      len = this.content.length; // 有冒号的属性

  if (c == '"' || c == "'") {
    this.start = ++this.i;
    this.i = this.content.indexOf(c, this.i);
    if (this.i == -1) return;
    this.handler.onAttrVal(this.content.substring(this.start, this.i));
  } // 没有冒号的属性
  else for (; this.i < len; this.i++) {
      if (blankChar[this.content[this.i]]) {
        this.handler.onAttrVal(this.content.substring(this.start, this.i));
        break;
      } else if (this.checkClose('onAttrVal')) return;
    }

  while (blankChar[this.content[++this.i]]) {
    ;
  }

  if (this.i < len && !this.checkClose()) {
    this.start = this.i;
    this.state = this.attrName;
  }
};
/**
 * @description 结束标签状态
 * @returns {String} 结束的标签名
 * @private
 */


lexer.prototype.endTag = function () {
  var c = this.content[this.i];

  if (blankChar[c] || c == '>' || c == '/') {
    this.handler.onCloseTag(this.content.substring(this.start, this.i));

    if (c != '>') {
      this.i = this.content.indexOf('>', this.i);
      if (this.i == -1) return;
    }

    this.start = ++this.i;
    this.state = this.text;
  } else this.i++;
};

module.exports = parser;