function AssetResolver::getCssAssets

Overrides AssetResolverInterface::getCssAssets

File

core/lib/Drupal/Core/Asset/AssetResolver.php, line 124

Class

AssetResolver

The default asset resolver.

Namespace

Code

public function getCssAssets(AttachedAssetsInterface $assets, $optimize, ?LanguageInterface $language = NULL) {
    if (!$assets->getLibraries()) {
        return [];
    }
    $libraries_to_load = $this->getLibrariesToLoad($assets);
    foreach ($libraries_to_load as $key => $library) {
        [
            $extension,
            $name,
        ] = explode('/', $library, 2);
        $definition = $this->libraryDiscovery
            ->getLibraryByName($extension, $name);
        if (empty($definition['css'])) {
            unset($libraries_to_load[$key]);
        }
    }
    $libraries_to_load = array_values($libraries_to_load);
    if (!$libraries_to_load) {
        return [];
    }
    if (!isset($language)) {
        $language = $this->languageManager
            ->getCurrentLanguage();
    }
    $theme_info = $this->themeManager
        ->getActiveTheme();
    // Add the theme name to the cache key since themes may implement
    // hook_library_info_alter().
    $cid = 'css:' . $theme_info->getName() . ':' . $language->getId() . Crypt::hashBase64(serialize($libraries_to_load)) . (int) $optimize;
    if ($cached = $this->cache
        ->get($cid)) {
        return $cached->data;
    }
    $css = [];
    $default_options = [
        'type' => 'file',
        'group' => CSS_AGGREGATE_DEFAULT,
        'weight' => 0,
        'media' => 'all',
        'preprocess' => TRUE,
    ];
    foreach ($libraries_to_load as $key => $library) {
        [
            $extension,
            $name,
        ] = explode('/', $library, 2);
        $definition = $this->libraryDiscovery
            ->getLibraryByName($extension, $name);
        foreach ($definition['css'] as $options) {
            $options += $default_options;
            // Copy the asset library license information to each file.
            $options['license'] = $definition['license'];
            // Files with a query string cannot be preprocessed.
            if ($options['type'] === 'file' && $options['preprocess'] && str_contains($options['data'], '?')) {
                $options['preprocess'] = FALSE;
            }
            // Always add a tiny value to the weight, to conserve the insertion
            // order.
            $options['weight'] += count($css) / 30000;
            // CSS files are being keyed by the full path.
            $css[$options['data']] = $options;
        }
    }
    // Allow modules and themes to alter the CSS assets.
    $this->moduleHandler
        ->alter('css', $css, $assets, $language);
    $this->themeManager
        ->alter('css', $css, $assets, $language);
    if (!empty($css)) {
        // Sort CSS items, so that they appear in the correct order.
        uasort($css, [
            static::class,
            'sort',
        ]);
        if ($optimize) {
            $css = \Drupal::service('asset.css.collection_optimizer')->optimize($css, array_values($libraries_to_load), $language);
        }
    }
    $this->cache
        ->set($cid, $css, CacheBackendInterface::CACHE_PERMANENT, [
        'library_info',
    ]);
    return $css;
}