/**
* Get accessor method for instance property.
*
* @return WP_DOM_Util Instance of the class.
*/
public static function get_instance()
{
// Check if an instance has not been created yet.
if (null == self::$instance) {
// Set instance of class.
self::$instance = new self();
}
// Return instance.
return self::$instance;
}
/**
* Displays MailChimp feed.
*
* Most notably, it adds necessary inline styles to whip email templates into shape.
*
* @param string $content Post content.
* @return string Modified post content, specific to the MailChimp feed.
*/
public function display_feed($content)
{
$dom_util = WP_DOM_Util::get_instance();
$dom = new DOMDocument();
$dom->preserveWhiteSpace = false;
$dom->LoadHTML($dom_util->get_meta() . $content);
$images = $dom->getElementsByTagName('img');
foreach ($images as $image) {
$image->setAttribute('style', 'max-width: 100%;');
}
do_action('wp_mailchimp_feed_modify_dom', $dom);
$content = $dom_util->get_inner_html($dom->getElementsByTagName('body')->item(0));
return $content;
}
/**
* Gets the image DOM elements from content.
*
* @param string $content Content with some markup, usually post content.
* @return DOMNodeList List of image elements found in content.
*/
public function get_image_elements($content)
{
if (!empty($content)) {
$dom_util = WP_DOM_Util::get_instance();
$dom = new DOMDocument();
$dom->preserveWhiteSpace = false;
$dom->LoadHTML($dom_util->get_meta() . $content);
return $dom->getElementsByTagName('img');
}
return new DOMNodeList();
}
