diff core/lib/Drupal/Component/DependencyInjection/Container.php @ 0:c75dbcec494b

Initial commit from drush-created site

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/lib/Drupal/Component/DependencyInjection/Container.php	Thu Jul 05 14:24:15 2018 +0000
@@ -0,0 +1,592 @@
+<?php
+
+namespace Drupal\Component\DependencyInjection;
+
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\DependencyInjection\ResettableContainerInterface;
+use Symfony\Component\DependencyInjection\Exception\LogicException;
+use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
+use Symfony\Component\DependencyInjection\Exception\RuntimeException;
+use Symfony\Component\DependencyInjection\Exception\ParameterNotFoundException;
+use Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException;
+use Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException;
+
+/**
+ * Provides a container optimized for Drupal's needs.
+ *
+ * This container implementation is compatible with the default Symfony
+ * dependency injection container and similar to the Symfony ContainerBuilder
+ * class, but optimized for speed.
+ *
+ * It is based on a PHP array container definition dumped as a
+ * performance-optimized machine-readable format.
+ *
+ * The best way to initialize this container is to use a Container Builder,
+ * compile it and then retrieve the definition via
+ * \Drupal\Component\DependencyInjection\Dumper\OptimizedPhpArrayDumper::getArray().
+ *
+ * The retrieved array can be cached safely and then passed to this container
+ * via the constructor.
+ *
+ * As the container is unfrozen by default, a second parameter can be passed to
+ * the container to "freeze" the parameter bag.
+ *
+ * This container is different in behavior from the default Symfony container in
+ * the following ways:
+ *
+ * - It only allows lowercase service and parameter names, though it does only
+ *   enforce it via assertions for performance reasons.
+ * - The following functions, that are not part of the interface, are explicitly
+ *   not supported: getParameterBag(), isFrozen(), compile(),
+ *   getAServiceWithAnIdByCamelCase().
+ * - The function getServiceIds() was added as it has a use-case in core and
+ *   contrib.
+ *
+ * @ingroup container
+ */
+class Container implements ContainerInterface, ResettableContainerInterface {
+
+  /**
+   * The parameters of the container.
+   *
+   * @var array
+   */
+  protected $parameters = [];
+
+  /**
+   * The aliases of the container.
+   *
+   * @var array
+   */
+  protected $aliases = [];
+
+  /**
+   * The service definitions of the container.
+   *
+   * @var array
+   */
+  protected $serviceDefinitions = [];
+
+  /**
+   * The instantiated services.
+   *
+   * @var array
+   */
+  protected $services = [];
+
+  /**
+   * The instantiated private services.
+   *
+   * @var array
+   */
+  protected $privateServices = [];
+
+  /**
+   * The currently loading services.
+   *
+   * @var array
+   */
+  protected $loading = [];
+
+  /**
+   * Whether the container parameters can still be changed.
+   *
+   * For testing purposes the container needs to be changed.
+   *
+   * @var bool
+   */
+  protected $frozen = TRUE;
+
+  /**
+   * Constructs a new Container instance.
+   *
+   * @param array $container_definition
+   *   An array containing the following keys:
+   *   - aliases: The aliases of the container.
+   *   - parameters: The parameters of the container.
+   *   - services: The service definitions of the container.
+   *   - frozen: Whether the container definition came from a frozen
+   *     container builder or not.
+   *   - machine_format: Whether this container definition uses the optimized
+   *     machine-readable container format.
+   */
+  public function __construct(array $container_definition = []) {
+    if (!empty($container_definition) && (!isset($container_definition['machine_format']) || $container_definition['machine_format'] !== TRUE)) {
+      throw new InvalidArgumentException('The non-optimized format is not supported by this class. Use an optimized machine-readable format instead, e.g. as produced by \Drupal\Component\DependencyInjection\Dumper\OptimizedPhpArrayDumper.');
+    }
+
+    $this->aliases = isset($container_definition['aliases']) ? $container_definition['aliases'] : [];
+    $this->parameters = isset($container_definition['parameters']) ? $container_definition['parameters'] : [];
+    $this->serviceDefinitions = isset($container_definition['services']) ? $container_definition['services'] : [];
+    $this->frozen = isset($container_definition['frozen']) ? $container_definition['frozen'] : FALSE;
+
+    // Register the service_container with itself.
+    $this->services['service_container'] = $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function get($id, $invalid_behavior = ContainerInterface::EXCEPTION_ON_INVALID_REFERENCE) {
+    if (isset($this->aliases[$id])) {
+      $id = $this->aliases[$id];
+    }
+
+    // Re-use shared service instance if it exists.
+    if (isset($this->services[$id]) || ($invalid_behavior === ContainerInterface::NULL_ON_INVALID_REFERENCE && array_key_exists($id, $this->services))) {
+      return $this->services[$id];
+    }
+
+    if (isset($this->loading[$id])) {
+      throw new ServiceCircularReferenceException($id, array_keys($this->loading));
+    }
+
+    $definition = isset($this->serviceDefinitions[$id]) ? $this->serviceDefinitions[$id] : NULL;
+
+    if (!$definition && $invalid_behavior === ContainerInterface::EXCEPTION_ON_INVALID_REFERENCE) {
+      if (!$id) {
+        throw new ServiceNotFoundException($id);
+      }
+
+      throw new ServiceNotFoundException($id, NULL, NULL, $this->getServiceAlternatives($id));
+    }
+
+    // In case something else than ContainerInterface::NULL_ON_INVALID_REFERENCE
+    // is used, the actual wanted behavior is to re-try getting the service at a
+    // later point.
+    if (!$definition) {
+      return;
+    }
+
+    // Definition is a keyed array, so [0] is only defined when it is a
+    // serialized string.
+    if (isset($definition[0])) {
+      $definition = unserialize($definition);
+    }
+
+    // Now create the service.
+    $this->loading[$id] = TRUE;
+
+    try {
+      $service = $this->createService($definition, $id);
+    }
+    catch (\Exception $e) {
+      unset($this->loading[$id]);
+      unset($this->services[$id]);
+
+      if (ContainerInterface::EXCEPTION_ON_INVALID_REFERENCE !== $invalid_behavior) {
+        return;
+      }
+
+      throw $e;
+    }
+
+    unset($this->loading[$id]);
+
+    return $service;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function reset() {
+    if (!empty($this->scopedServices)) {
+      throw new LogicException('Resetting the container is not allowed when a scope is active.');
+    }
+
+    $this->services = [];
+  }
+
+  /**
+   * Creates a service from a service definition.
+   *
+   * @param array $definition
+   *   The service definition to create a service from.
+   * @param string $id
+   *   The service identifier, necessary so it can be shared if its public.
+   *
+   * @return object
+   *   The service described by the service definition.
+   *
+   * @throws \Symfony\Component\DependencyInjection\Exception\RuntimeException
+   *   Thrown when the service is a synthetic service.
+   * @throws \Symfony\Component\DependencyInjection\Exception\InvalidArgumentException
+   *   Thrown when the configurator callable in $definition['configurator'] is
+   *   not actually a callable.
+   * @throws \ReflectionException
+   *   Thrown when the service class takes more than 10 parameters to construct,
+   *   and cannot be instantiated.
+   */
+  protected function createService(array $definition, $id) {
+    if (isset($definition['synthetic']) && $definition['synthetic'] === TRUE) {
+      throw new RuntimeException(sprintf('You have requested a synthetic service ("%s"). The service container does not know how to construct this service. The service will need to be set before it is first used.', $id));
+    }
+
+    $arguments = [];
+    if (isset($definition['arguments'])) {
+      $arguments = $definition['arguments'];
+
+      if ($arguments instanceof \stdClass) {
+        $arguments = $this->resolveServicesAndParameters($arguments);
+      }
+    }
+
+    if (isset($definition['file'])) {
+      $file = $this->frozen ? $definition['file'] : current($this->resolveServicesAndParameters([$definition['file']]));
+      require_once $file;
+    }
+
+    if (isset($definition['factory'])) {
+      $factory = $definition['factory'];
+      if (is_array($factory)) {
+        $factory = $this->resolveServicesAndParameters([$factory[0], $factory[1]]);
+      }
+      elseif (!is_string($factory)) {
+        throw new RuntimeException(sprintf('Cannot create service "%s" because of invalid factory', $id));
+      }
+
+      $service = call_user_func_array($factory, $arguments);
+    }
+    else {
+      $class = $this->frozen ? $definition['class'] : current($this->resolveServicesAndParameters([$definition['class']]));
+      $length = isset($definition['arguments_count']) ? $definition['arguments_count'] : count($arguments);
+
+      // Optimize class instantiation for services with up to 10 parameters as
+      // ReflectionClass is noticeably slow.
+      switch ($length) {
+        case 0:
+          $service = new $class();
+          break;
+
+        case 1:
+          $service = new $class($arguments[0]);
+          break;
+
+        case 2:
+          $service = new $class($arguments[0], $arguments[1]);
+          break;
+
+        case 3:
+          $service = new $class($arguments[0], $arguments[1], $arguments[2]);
+          break;
+
+        case 4:
+          $service = new $class($arguments[0], $arguments[1], $arguments[2], $arguments[3]);
+          break;
+
+        case 5:
+          $service = new $class($arguments[0], $arguments[1], $arguments[2], $arguments[3], $arguments[4]);
+          break;
+
+        case 6:
+          $service = new $class($arguments[0], $arguments[1], $arguments[2], $arguments[3], $arguments[4], $arguments[5]);
+          break;
+
+        case 7:
+          $service = new $class($arguments[0], $arguments[1], $arguments[2], $arguments[3], $arguments[4], $arguments[5], $arguments[6]);
+          break;
+
+        case 8:
+          $service = new $class($arguments[0], $arguments[1], $arguments[2], $arguments[3], $arguments[4], $arguments[5], $arguments[6], $arguments[7]);
+          break;
+
+        case 9:
+          $service = new $class($arguments[0], $arguments[1], $arguments[2], $arguments[3], $arguments[4], $arguments[5], $arguments[6], $arguments[7], $arguments[8]);
+          break;
+
+        case 10:
+          $service = new $class($arguments[0], $arguments[1], $arguments[2], $arguments[3], $arguments[4], $arguments[5], $arguments[6], $arguments[7], $arguments[8], $arguments[9]);
+          break;
+
+        default:
+          $r = new \ReflectionClass($class);
+          $service = $r->newInstanceArgs($arguments);
+          break;
+      }
+    }
+
+    if (!isset($definition['shared']) || $definition['shared'] !== FALSE) {
+      $this->services[$id] = $service;
+    }
+
+    if (isset($definition['calls'])) {
+      foreach ($definition['calls'] as $call) {
+        $method = $call[0];
+        $arguments = [];
+        if (!empty($call[1])) {
+          $arguments = $call[1];
+          if ($arguments instanceof \stdClass) {
+            $arguments = $this->resolveServicesAndParameters($arguments);
+          }
+        }
+        call_user_func_array([$service, $method], $arguments);
+      }
+    }
+
+    if (isset($definition['properties'])) {
+      if ($definition['properties'] instanceof \stdClass) {
+        $definition['properties'] = $this->resolveServicesAndParameters($definition['properties']);
+      }
+      foreach ($definition['properties'] as $key => $value) {
+        $service->{$key} = $value;
+      }
+    }
+
+    if (isset($definition['configurator'])) {
+      $callable = $definition['configurator'];
+      if (is_array($callable)) {
+        $callable = $this->resolveServicesAndParameters($callable);
+      }
+
+      if (!is_callable($callable)) {
+        throw new InvalidArgumentException(sprintf('The configurator for class "%s" is not a callable.', get_class($service)));
+      }
+
+      call_user_func($callable, $service);
+    }
+
+    return $service;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function set($id, $service) {
+    $this->services[$id] = $service;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function has($id) {
+    return isset($this->aliases[$id]) || isset($this->services[$id]) || isset($this->serviceDefinitions[$id]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getParameter($name) {
+    if (!(isset($this->parameters[$name]) || array_key_exists($name, $this->parameters))) {
+      if (!$name) {
+        throw new ParameterNotFoundException($name);
+      }
+
+      throw new ParameterNotFoundException($name, NULL, NULL, NULL, $this->getParameterAlternatives($name));
+    }
+
+    return $this->parameters[$name];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function hasParameter($name) {
+    return isset($this->parameters[$name]) || array_key_exists($name, $this->parameters);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setParameter($name, $value) {
+    if ($this->frozen) {
+      throw new LogicException('Impossible to call set() on a frozen ParameterBag.');
+    }
+
+    $this->parameters[$name] = $value;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function initialized($id) {
+    if (isset($this->aliases[$id])) {
+      $id = $this->aliases[$id];
+    }
+
+    return isset($this->services[$id]) || array_key_exists($id, $this->services);
+  }
+
+  /**
+   * Resolves arguments that represent services or variables to the real values.
+   *
+   * @param array|\stdClass $arguments
+   *   The arguments to resolve.
+   *
+   * @return array
+   *   The resolved arguments.
+   *
+   * @throws \Symfony\Component\DependencyInjection\Exception\RuntimeException
+   *   If a parameter/service could not be resolved.
+   * @throws \Symfony\Component\DependencyInjection\Exception\InvalidArgumentException
+   *   If an unknown type is met while resolving parameters and services.
+   */
+  protected function resolveServicesAndParameters($arguments) {
+    // Check if this collection needs to be resolved.
+    if ($arguments instanceof \stdClass) {
+      if ($arguments->type !== 'collection') {
+        throw new InvalidArgumentException(sprintf('Undefined type "%s" while resolving parameters and services.', $arguments->type));
+      }
+      // In case there is nothing to resolve, we are done here.
+      if (!$arguments->resolve) {
+        return $arguments->value;
+      }
+      $arguments = $arguments->value;
+    }
+
+    // Process the arguments.
+    foreach ($arguments as $key => $argument) {
+      // For this machine-optimized format, only \stdClass arguments are
+      // processed and resolved. All other values are kept as is.
+      if ($argument instanceof \stdClass) {
+        $type = $argument->type;
+
+        // Check for parameter.
+        if ($type == 'parameter') {
+          $name = $argument->name;
+          if (!isset($this->parameters[$name])) {
+            $arguments[$key] = $this->getParameter($name);
+            // This can never be reached as getParameter() throws an Exception,
+            // because we already checked that the parameter is not set above.
+          }
+
+          // Update argument.
+          $argument = $arguments[$key] = $this->parameters[$name];
+
+          // In case there is not a machine readable value (e.g. a service)
+          // behind this resolved parameter, continue.
+          if (!($argument instanceof \stdClass)) {
+            continue;
+          }
+
+          // Fall through.
+          $type = $argument->type;
+        }
+
+        // Create a service.
+        if ($type == 'service') {
+          $id = $argument->id;
+
+          // Does the service already exist?
+          if (isset($this->aliases[$id])) {
+            $id = $this->aliases[$id];
+          }
+
+          if (isset($this->services[$id])) {
+            $arguments[$key] = $this->services[$id];
+            continue;
+          }
+
+          // Return the service.
+          $arguments[$key] = $this->get($id, $argument->invalidBehavior);
+
+          continue;
+        }
+        // Create private service.
+        elseif ($type == 'private_service') {
+          $id = $argument->id;
+
+          // Does the private service already exist.
+          if (isset($this->privateServices[$id])) {
+            $arguments[$key] = $this->privateServices[$id];
+            continue;
+          }
+
+          // Create the private service.
+          $arguments[$key] = $this->createService($argument->value, $id);
+          if ($argument->shared) {
+            $this->privateServices[$id] = $arguments[$key];
+          }
+
+          continue;
+        }
+        // Check for collection.
+        elseif ($type == 'collection') {
+          $value = $argument->value;
+
+          // Does this collection need resolving?
+          if ($argument->resolve) {
+            $arguments[$key] = $this->resolveServicesAndParameters($value);
+          }
+          else {
+            $arguments[$key] = $value;
+          }
+
+          continue;
+        }
+
+        if ($type !== NULL) {
+          throw new InvalidArgumentException(sprintf('Undefined type "%s" while resolving parameters and services.', $type));
+        }
+      }
+    }
+
+    return $arguments;
+  }
+
+  /**
+   * Provides alternatives for a given array and key.
+   *
+   * @param string $search_key
+   *   The search key to get alternatives for.
+   * @param array $keys
+   *   The search space to search for alternatives in.
+   *
+   * @return string[]
+   *   An array of strings with suitable alternatives.
+   */
+  protected function getAlternatives($search_key, array $keys) {
+    $alternatives = [];
+    foreach ($keys as $key) {
+      $lev = levenshtein($search_key, $key);
+      if ($lev <= strlen($search_key) / 3 || strpos($key, $search_key) !== FALSE) {
+        $alternatives[] = $key;
+      }
+    }
+
+    return $alternatives;
+  }
+
+  /**
+   * Provides alternatives in case a service was not found.
+   *
+   * @param string $id
+   *   The service to get alternatives for.
+   *
+   * @return string[]
+   *   An array of strings with suitable alternatives.
+   */
+  protected function getServiceAlternatives($id) {
+    $all_service_keys = array_unique(array_merge(array_keys($this->services), array_keys($this->serviceDefinitions)));
+    return $this->getAlternatives($id, $all_service_keys);
+  }
+
+  /**
+   * Provides alternatives in case a parameter was not found.
+   *
+   * @param string $name
+   *   The parameter to get alternatives for.
+   *
+   * @return string[]
+   *   An array of strings with suitable alternatives.
+   */
+  protected function getParameterAlternatives($name) {
+    return $this->getAlternatives($name, array_keys($this->parameters));
+  }
+
+  /**
+   * Gets all defined service IDs.
+   *
+   * @return array
+   *   An array of all defined service IDs.
+   */
+  public function getServiceIds() {
+    return array_keys($this->serviceDefinitions + $this->services);
+  }
+
+  /**
+   * Ensure that cloning doesn't work.
+   */
+  private function __clone() {
+  }
+
+}