function RenderCache::getCacheableRenderArray

Overrides RenderCacheInterface::getCacheableRenderArray

File

core/lib/Drupal/Core/Render/RenderCache.php, line 331

Class

RenderCache

Wraps the caching logic for the render caching system.

Namespace

Code

public function getCacheableRenderArray(array $elements) {
    $data = [
        '#markup' => $elements['#markup'],
        '#attached' => $elements['#attached'],
        '#cache' => [
            'contexts' => $elements['#cache']['contexts'],
            'tags' => $elements['#cache']['tags'],
            'max-age' => $elements['#cache']['max-age'],
        ],
    ];
    // Preserve cacheable items if specified. If we are preserving any cacheable
    // children of the element, we assume we are only interested in their
    // individual markup and not the parent's one, thus we empty it to minimize
    // the cache entry size.
    if (!empty($elements['#cache_properties']) && is_array($elements['#cache_properties'])) {
        $data['#cache_properties'] = $elements['#cache_properties'];
        // Extract all the cacheable items from the element using cache
        // properties.
        $cacheable_items = array_intersect_key($elements, array_flip($elements['#cache_properties']));
        $cacheable_children = Element::children($cacheable_items);
        if ($cacheable_children) {
            $data['#markup'] = '';
            // Cache only cacheable children's markup.
            foreach ($cacheable_children as $key) {
                // We can assume that #markup is safe at this point.
                $cacheable_items[$key] = [
                    '#markup' => Markup::create($cacheable_items[$key]['#markup']),
                ];
            }
        }
        $data += $cacheable_items;
    }
    $data['#markup'] = Markup::create($data['#markup']);
    return $data;
}