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- <?php
- 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);
- }
- }
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