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
  