public function LazyFilter::process in Lazy-load 8

Same name and namespace in other branches

1. 8.3 src/Plugin/Filter/LazyFilter.php \Drupal\lazy\Plugin\Filter\LazyFilter::process()
2. 8.2 src/Plugin/Filter/LazyFilter.php \Drupal\lazy\Plugin\Filter\LazyFilter::process()

Performs the filter processing.

Parameters

string $text: The text string to be filtered.

string $langcode: The language code of the text to be filtered.

Return value

\Drupal\filter\FilterProcessResult The filtered text, wrapped in a FilterProcessResult object, and possibly with associated assets, cacheability metadata and placeholders.

Overrides FilterInterface::process

See also

\Drupal\filter\FilterProcessResult

File

src/Plugin/Filter/LazyFilter.php, line 25

Class

LazyFilter

Provides a filter to lazy-load images.

Namespace

Drupal\lazy\Plugin\Filter

Code

public function process($text, $langcode) {
  $config = \Drupal::config('lazy.settings')
    ->get();
  $opt_skipClass = $config['skipClass'];
  $opt_selector = ltrim($config['selector'], '.');
  $opt_tags = $config['alter_tag'];
  $opt_src = $config['src'] !== 'src' ? $config['src'] : 'data-filterlazy-src';
  $opt_placeholderSrc = $config['placeholderSrc'];
  $result = new FilterProcessResult($text);
  $html_dom = Html::load($text);
  $pages = $config['disabled_paths'];
  $path_matches = lazy_disabled_by_path($pages);
  if (!$path_matches) {
    foreach ($opt_tags as $tag => $status) {
      $matches = $html_dom
        ->getElementsByTagName($tag);
      foreach ($matches as $element) {
        $classes = $element
          ->getAttribute('class');
        $classes = strlen($classes) > 0 ? explode(' ', $classes) : [];
        $parent_classes = $element->parentNode
          ->getAttribute('class');
        $parent_classes = strlen($parent_classes) > 0 ? explode(' ', $parent_classes) : [];
        if (empty($opt_tags[$tag])) {

          // If the `tag` is not enabled remove the bLazy selector class.
          if (($key = array_search($opt_selector, $classes, FALSE)) !== FALSE) {
            unset($classes[$key]);
            $element
              ->setAttribute('class', implode(' ', $classes));
            if (empty($classes)) {
              $element
                ->removeAttribute('class');
            }
          }
        }
        else {

          // `tag` is enabled. Make sure skipClass is not set before proceeding.
          if (!in_array($opt_skipClass, $classes, FALSE) && !in_array($opt_skipClass, $parent_classes, FALSE)) {
            $classes[] = $opt_selector;
            $classes = array_unique($classes);
            $element
              ->setAttribute('class', implode(' ', $classes));
            $src = $element
              ->getAttribute('src');
            $element
              ->removeAttribute('src');
            $element
              ->setAttribute($opt_src, $src);
            $element
              ->setAttribute('src', $opt_placeholderSrc);
          }
        }
      }
    }
  }
  $result
    ->setProcessedText(Html::serialize($html_dom));
  return $result;
}