public function convert(ElementInterface $element)
 {
     $text = $element->getValue();
     $size = $element->getAttribute('size');
     $color = $element->getAttribute('color');
     $bbcode = $text;
     if ($size) {
         $bbcode = "[size={$size}]{$bbcode}[/size]";
     }
     if ($color) {
         $bbcode = "[color={$color}]{$bbcode}[/color]";
     }
     return $bbcode;
 }
 public function convert(ElementInterface $element)
 {
     $href = $element->getAttribute('href');
     $text = $element->getValue();
     $bbcode = '[url=' . $href . ']' . $text . '[/url]';
     return $bbcode;
 }
 public function convert(ElementInterface $element)
 {
     $src = $element->getAttribute('src');
     $bbcode = "[img]{$src}[/img]";
     return $bbcode;
 }