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        // comments containing -- are not allowed unless they terminate the comment
        index = html.indexOf("--", 4);

        if ( index >= 0 && html.lastIndexOf("-->", index) === index) {
          if (handler.comment) handler.comment( html.substring( 4, index ) );
          html = html.substring( index + 3 );
          chars = false;
        }
      // DOCTYPE
      } else if ( DOCTYPE_REGEXP.test(html) ) {
        match = html.match( DOCTYPE_REGEXP );

        if ( match ) {
          html = html.replace( match[0] , '');
          chars = false;
        }
      // end tag
      } else if ( BEGING_END_TAGE_REGEXP.test(html) ) {
        match = html.match( END_TAG_REGEXP );

        if ( match ) {
          html = html.substring( match[0].length );
          match[0].replace( END_TAG_REGEXP, parseEndTag );
          chars = false;
        }

      // start tag
      } else if ( BEGIN_TAG_REGEXP.test(html) ) {
        match = html.match( START_TAG_REGEXP );

        if ( match ) {
          html = html.substring( match[0].length );
          match[0].replace( START_TAG_REGEXP, parseStartTag );
          chars = false;
        }
      }

      if ( chars ) {
        index = html.indexOf("<");

        var text = index < 0 ? html : html.substring( 0, index );
        html = index < 0 ? "" : html.substring( index );

        if (handler.chars) handler.chars( decodeEntities(text) );
      }

    } else {
      html = html.replace(new RegExp("(.*)<\\s*\\/\\s*" + stack.last() + "[^>]*>", 'i'),
        function(all, text){
          text = text.replace(COMMENT_REGEXP, "$1").replace(CDATA_REGEXP, "$1");

          if (handler.chars) handler.chars( decodeEntities(text) );

          return "";
      });

      parseEndTag( "", stack.last() );
    }

    if ( html == last ) {
      throw $sanitizeMinErr('badparse', "The sanitizer was unable to parse the following block " +
                                        "of html: {0}", html);
    }
    last = html;
  }

  // Clean up any remaining tags
  parseEndTag();

  function parseStartTag( tag, tagName, rest, unary ) {
    tagName = angular.lowercase(tagName);
    if ( blockElements[ tagName ] ) {
      while ( stack.last() && inlineElements[ stack.last() ] ) {
        parseEndTag( "", stack.last() );
      }
    }

    if ( optionalEndTagElements[ tagName ] && stack.last() == tagName ) {
      parseEndTag( "", tagName );
    }

    unary = voidElements[ tagName ] || !!unary;

    if ( !unary )
      stack.push( tagName );

    var attrs = {};

    rest.replace(ATTR_REGEXP,
      function(match, name, doubleQuotedValue, singleQuotedValue, unquotedValue) {
        var value = doubleQuotedValue
          || singleQuotedValue
          || unquotedValue
          || '';

        attrs[name] = decodeEntities(value);
    });
    if (handler.start) handler.start( tagName, attrs, unary );
  }

  function parseEndTag( tag, tagName ) {
    var pos = 0, i;
    tagName = angular.lowercase(tagName);
    if ( tagName )
      // Find the closest opened tag of the same type
      for ( pos = stack.length - 1; pos >= 0; pos-- )
        if ( stack[ pos ] == tagName )
          break;

    if ( pos >= 0 ) {
      // Close all the open elements, up the stack
      for ( i = stack.length - 1; i >= pos; i-- )
        if (handler.end) handler.end( stack[ i ] );

      // Remove the open elements from the stack
      stack.length = pos;
    }
  }
}

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