text: /**
   * 
   * htmlParser改造自: https://github.com/blowsie/Pure-JavaScript-HTML5-Parser
   * 
   * author: Di (微信小程序开发工程师)
   * organization: WeAppDev(微信小程序开发论坛)(http://weappdev.com)
   *               垂直微信小程序开发交流社区
   * 
   * github地址: https://github.com/icindy/wxParse
   * 
   * for: 微信小程序富文本解析
   * detail : http://weappdev.com/t/wxparse-alpha0-1-html-markdown/184
   */
  // Regular Expressions for parsing tags and attributes
  var startTag = /^<([-A-Za-z0-9_]+)((?:\s+[a-zA-Z_:][-a-zA-Z0-9_:.]*(?:\s*=\s*(?:(?:"[^"]*")|(?:'[^']*')|[^>\s]+))?)*)\s*(\/?)>/,
    endTag = /^<\/([-A-Za-z0-9_]+)[^>]*>/,
    attr = /([a-zA-Z_:][-a-zA-Z0-9_:.]*)(?:\s*=\s*(?:(?:"((?:\\.|[^"])*)")|(?:'((?:\\.|[^'])*)')|([^>\s]+)))?/g;
  
  // Empty Elements - HTML 5
  var empty = makeMap("area,base,basefont,br,col,frame,hr,img,input,link,meta,param,embed,command,keygen,source,track,wbr");
  
  // Block Elements - HTML 5
  var block = makeMap("a,address,code,article,applet,aside,audio,blockquote,button,canvas,center,dd,del,dir,div,dl,dt,fieldset,figcaption,figure,footer,form,frameset,h1,h2,h3,h4,h5,h6,header,hgroup,hr,iframe,ins,isindex,li,map,menu,noframes,noscript,object,ol,output,p,pre,section,script,table,tbody,td,tfoot,th,thead,tr,ul,video");
  
  // Inline Elements - HTML 5
  var inline = makeMap("abbr,acronym,applet,b,basefont,bdo,big,br,button,cite,del,dfn,em,font,i,iframe,img,input,ins,kbd,label,map,object,q,s,samp,script,select,small,span,strike,strong,sub,sup,textarea,tt,u,var");
  
  // Elements that you can, intentionally, leave open
  // (and which close themselves)
  var closeSelf = makeMap("colgroup,dd,dt,li,options,p,td,tfoot,th,thead,tr");
  
  // Attributes that have their values filled in disabled="disabled"
  var fillAttrs = makeMap("checked,compact,declare,defer,disabled,ismap,multiple,nohref,noresize,noshade,nowrap,readonly,selected");
  
  // Special Elements (can contain anything)
  var special = makeMap("wxxxcode-style,script,style,view,scroll-view,block");
  
  function HTMLParser(html, handler) {
    var index, chars, match, stack = [],
      last = html;
    stack.last = function () {
      return this[this.length - 1];
    };
  
    while (html) {
      chars = true;
  
      // Make sure we're not in a script or style element
      if (!stack.last() || !special[stack.last()]) {
  
        // Comment
        if (html.indexOf("<!--") == 0) {
          index = html.indexOf("-->");
  
          if (index >= 0) {
            if (handler.comment)
              handler.comment(html.substring(4, index));
            html = html.substring(index + 3);
            chars = false;
          }
  
          // end tag
        } else if (html.indexOf("</") == 0) {
          match = html.match(endTag);
  
          if (match) {
            html = html.substring(match[0].length);
            match[0].replace(endTag, parseEndTag);
            chars = false;
          }
  
          // start tag
        } else if (html.indexOf("<") == 0) {
          match = html.match(startTag);
  
          if (match) {
            html = html.substring(match[0].length);
            match[0].replace(startTag, parseStartTag);
            chars = false;
          }
        }
  
        if (chars) {
          index = html.indexOf("<");
          var text = ''
          while (index === 0) {
            text += "<";
            html = html.substring(1);
            index = html.indexOf("<");
          }
          text += index < 0 ? html : html.substring(0, index);
          html = index < 0 ? "" : html.substring(index);
  
          if (handler.chars)
            handler.chars(text);
        }
  
      } else {
  
        html = html.replace(new RegExp("([\\s\\S]*?)<\/" + stack.last() + "[^>]*>"), function (all, text) {
          text = text.replace(/<!--([\s\S]*?)-->|<!\[CDATA\[([\s\S]*?)]]>/g, "$1$2");
          if (handler.chars)
            handler.chars(text);
  
          return "";
        });
  
  
        parseEndTag("", stack.last());
      }
  
      if (html == last)
        throw "Parse Error: " + html;
      last = html;
    }
  
    // Clean up any remaining tags
    parseEndTag();
  
    function parseStartTag(tag, tagName, rest, unary) {
      tagName = tagName.toLowerCase();
  
      if (block[tagName]) {
        while (stack.last() && inline[stack.last()]) {
          parseEndTag("", stack.last());
        }
      }
  
      if (closeSelf[tagName] && stack.last() == tagName) {
        parseEndTag("", tagName);
      }
  
      unary = empty[tagName] || !!unary;
  
      if (!unary)
        stack.push(tagName);
  
      if (handler.start) {
        var attrs = [];
  
        rest.replace(attr, function (match, name) {
          var value = arguments[2] ? arguments[2] :
            arguments[3] ? arguments[3] :
            arguments[4] ? arguments[4] :
            fillAttrs[name] ? name : "";
  
          attrs.push({
            name: name,
            value: value,
            escaped: value.replace(/(^|[^\\])"/g, '$1\\\"') //"
          });
        });
  
        if (handler.start) {
          handler.start(tagName, attrs, unary);
        }
  
      }
    }
  
    function parseEndTag(tag, tagName) {
      // If no tag name is provided, clean shop
      if (!tagName)
        var pos = 0;
  
      // Find the closest opened tag of the same type
      else {
        tagName = tagName.toLowerCase();
        for (var pos = stack.length - 1; pos >= 0; pos--)
          if (stack[pos] == tagName)
            break;
      }
      if (pos >= 0) {
        // Close all the open elements, up the stack
        for (var i = stack.length - 1; i >= pos; i--)
          if (handler.end)
            handler.end(stack[i]);
  
        // Remove the open elements from the stack
        stack.length = pos;
      }
    }
  };
  
  
  function makeMap(str) {
    var obj = {},
      items = str.split(",");
    for (var i = 0; i < items.length; i++)
      obj[items[i]] = true;
    return obj;
  }
  
  module.exports = HTMLParser;