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| <?php | |
| /** | |
| * @file | |
| * Contains \Drupal\Core\Cache\Context\CacheContextsPass. | |
| */ | |
| namespace Drupal\Core\Cache\Context; | |
| use Symfony\Component\DependencyInjection\ContainerBuilder; | |
| use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface; | |
| /** | |
| * Adds cache_contexts parameter to the container. | |
| */ | |
| class CacheContextsPass implements CompilerPassInterface { | |
| /** | |
| * Implements CompilerPassInterface::process(). | |
| * | |
| * Collects the cache contexts into the cache_contexts parameter. | |
| */ | |
| public function process(ContainerBuilder $container) { | |
| $cache_contexts = []; | |
| foreach (array_keys($container->findTaggedServiceIds('cache.context')) as $id) { | |
| if (strpos($id, 'cache_context.') !== 0) { | |
| throw new \InvalidArgumentException(sprintf('The service "%s" has an invalid service ID: cache context service IDs must use the "cache_context." prefix. (The suffix is the cache context ID developers may use.)', $id)); | |
| } | |
| $cache_contexts[] = substr($id, 14); | |
| } | |
| // Validate. | |
| sort($cache_contexts); | |
| foreach ($cache_contexts as $id) { | |
| // Validate the hierarchy of non-root-level cache contexts. | |
| if (strpos($id, '.') !== FALSE) { | |
| $parent = substr($id, 0, strrpos($id, '.')); | |
| if (!in_array($parent, $cache_contexts)) { | |
| throw new \InvalidArgumentException(sprintf('The service "%s" has an invalid service ID: the period indicates the hierarchy of cache contexts, therefore "%s" is considered the parent cache context, but no cache context service with that name was found.', $id, $parent)); | |
| } | |
| } | |
| } | |
| $container->setParameter('cache_contexts', $cache_contexts); | |
| } | |
| } |