FieldItemListNormalizer.php in Facebook Instant Articles 3.x

Namespace

Drupal\fb_instant_articles\Normalizer

File

src/Normalizer/FieldItemListNormalizer.php

<?php

namespace Drupal\fb_instant_articles\Normalizer;

use Drupal\Core\Field\FormatterInterface;
use Drupal\Core\Render\RendererInterface;
use Drupal\fb_instant_articles\Plugin\Field\InstantArticleFormatterInterface;
use Drupal\fb_instant_articles\Regions;
use Drupal\fb_instant_articles\TransformerFactory;
use Drupal\serialization\Normalizer\NormalizerBase;
use Facebook\InstantArticles\Elements\Footer;
use Facebook\InstantArticles\Elements\Header;

/**
 * Normalize FieldItemList object into an Instant Article object.
 */
class FieldItemListNormalizer extends NormalizerBase {

  /**
   * {@inheritdoc}
   */
  protected $supportedInterfaceOrClass = 'Drupal\\Core\\Field\\FieldItemListInterface';

  /**
   * {@inheritdoc}
   */
  protected $format = 'fbia';

  /**
   * Renderer service.
   *
   * @var \Drupal\Core\Render\RendererInterface
   */
  protected $renderer;

  /**
   * Transformer factory.
   *
   * @var \Drupal\fb_instant_articles\TransformerFactory
   */
  protected $transformerFactory;

  /**
   * FieldItemListNormalizer constructor.
   *
   * @param \Drupal\Core\Render\RendererInterface $renderer
   *   The renderer service.
   * @param \Drupal\fb_instant_articles\TransformerFactory $transformer_factory
   *   Transformer factory.
   */
  public function __construct(RendererInterface $renderer, TransformerFactory $transformer_factory) {
    $this->renderer = $renderer;
    $this->transformerFactory = $transformer_factory;
  }

  /**
   * {@inheritdoc}
   */
  public function normalize($object, $format = NULL, array $context = []) {

    /** @var \Drupal\Core\Field\FieldItemListInterface $object */
    if (!isset($context['instant_article'])) {
      return;
    }

    /** @var \Facebook\InstantArticles\Elements\InstantArticle $article */
    $article = $context['instant_article'];

    // If we're given an entity_view_display object as context, use that as a
    // mapping to guide the normalization.
    if (isset($context['entity_view_display'])) {

      /** @var \Drupal\Core\Entity\Entity\EntityViewDisplay $display */
      $display = $context['entity_view_display'];
      $formatter = $display
        ->getRenderer($object
        ->getName());
      $component = $display
        ->getComponent($object
        ->getName());
      if ($formatter instanceof InstantArticleFormatterInterface) {
        $formatter
          ->viewInstantArticle($object, $article, $component['region'], $this->serializer);
      }
      elseif ($formatter instanceof FormatterInterface) {
        $formatter
          ->prepareView([
          $object
            ->getEntity()
            ->id() => $object,
        ]);
        $render_array = $formatter
          ->view($object);
        if ($markup = (string) $this->renderer
          ->renderPlain($render_array)) {

          // Determine correct context for transformation.
          $transformer_context = $article;
          if ($component['region'] === Regions::REGION_HEADER) {
            $header = $article
              ->getHeader();
            if (!$header) {
              $header = Header::create();
              $article
                ->withHeader($header);
            }
            $transformer_context = $header;
          }
          elseif ($component['region'] === Regions::REGION_FOOTER) {
            $footer = $article
              ->getFooter();
            if (!$footer) {
              $footer = Footer::create();
              $article
                ->withFooter($footer);
            }
            $transformer_context = $footer;
          }

          // Region-aware transformation of rendered markup.
          // Pass the markup through the Transformer.
          $transformer = $this->transformerFactory
            ->getTransformer();
          $transformer
            ->transformString($transformer_context, $markup);
          $this->transformerFactory
            ->flushTransformerLogs($transformer);
        }
      }
    }
  }

}

Classes

Name	Description
FieldItemListNormalizer	Normalize FieldItemList object into an Instant Article object.