TwigExtension::escapeFilter

public TwigExtension::escapeFilter(\Twig_Environment $env, $arg, $strategy = 'html', $charset = NULL, $autoescape = FALSE)

public function escapeFilter(\Twig_Environment $env, $arg, $strategy = 'html', $charset = NULL, $autoescape = FALSE) {
  // Check for a numeric zero int or float.
  if ($arg === 0 || $arg === 0.0) {
    return 0;
  }

  // Return early for NULL and empty arrays.
  if ($arg == NULL) {
    return NULL;
  }

  $this->bubbleArgMetadata($arg);

  // Keep Twig_Markup objects intact to support autoescaping.
  if ($autoescape && ($arg instanceof \Twig_Markup || $arg instanceof MarkupInterface)) {
    return $arg;
  }

  $return = NULL;

  if (is_scalar($arg)) {
    $return = (string) $arg;
  }
  elseif (is_object($arg)) {
    if ($arg instanceof RenderableInterface) {
      $arg = $arg->toRenderable();
    }
    elseif (method_exists($arg, '__toString')) {
      $return = (string) $arg;
    }
    // You can't throw exceptions in the magic PHP __toString() methods, see
    // http://php.net/manual/language.oop5.magic.php#object.tostring so
    // we also support a toString method.
    elseif (method_exists($arg, 'toString')) {
      $return = $arg->toString();
    }
    else {
      throw new \Exception('Object of type ' . get_class($arg) . ' cannot be printed.');
    }
  }

  // We have a string or an object converted to a string: Autoescape it!
  if (isset($return)) {
    if ($autoescape && $return instanceof MarkupInterface) {
      return $return;
    }
    // Drupal only supports the HTML escaping strategy, so provide a
    // fallback for other strategies.
    if ($strategy == 'html') {
      return Html::escape($return);
    }
    return twig_escape_filter($env, $return, $strategy, $charset, $autoescape);
  }

  // This is a normal render array, which is safe by definition, with
  // special simple cases already handled.

  // Early return if this element was pre-rendered (no need to re-render).
  if (isset($arg['#printed']) && $arg['#printed'] == TRUE && isset($arg['#markup']) && strlen($arg['#markup']) > 0) {
    return $arg['#markup'];
  }
  $arg['#printed'] = FALSE;
  return $this->renderer->render($arg);
}