--- /dev/null
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\DependencyInjection;
+
+use Symfony\Component\DependencyInjection\Exception\InactiveScopeException;
+use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
+use Symfony\Component\DependencyInjection\Exception\LogicException;
+use Symfony\Component\DependencyInjection\Exception\RuntimeException;
+use Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException;
+use Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException;
+use Symfony\Component\DependencyInjection\ParameterBag\ParameterBagInterface;
+use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
+use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
+
+/**
+ * Container is a dependency injection container.
+ *
+ * It gives access to object instances (services).
+ *
+ * Services and parameters are simple key/pair stores.
+ *
+ * Parameter and service keys are case insensitive.
+ *
+ * A service id can contain lowercased letters, digits, underscores, and dots.
+ * Underscores are used to separate words, and dots to group services
+ * under namespaces:
+ *
+ * <ul>
+ * <li>request</li>
+ * <li>mysql_session_storage</li>
+ * <li>symfony.mysql_session_storage</li>
+ * </ul>
+ *
+ * A service can also be defined by creating a method named
+ * getXXXService(), where XXX is the camelized version of the id:
+ *
+ * <ul>
+ * <li>request -> getRequestService()</li>
+ * <li>mysql_session_storage -> getMysqlSessionStorageService()</li>
+ * <li>symfony.mysql_session_storage -> getSymfony_MysqlSessionStorageService()</li>
+ * </ul>
+ *
+ * The container can have three possible behaviors when a service does not exist:
+ *
+ * * EXCEPTION_ON_INVALID_REFERENCE: Throws an exception (the default)
+ * * NULL_ON_INVALID_REFERENCE: Returns null
+ * * IGNORE_ON_INVALID_REFERENCE: Ignores the wrapping command asking for the reference
+ * (for instance, ignore a setter if the service does not exist)
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @author Johannes M. Schmitt <schmittjoh@gmail.com>
+ */
+class Container implements IntrospectableContainerInterface, ResettableContainerInterface
+{
+ /**
+ * @var ParameterBagInterface
+ */
+ protected $parameterBag;
+
+ protected $services = array();
+ protected $methodMap = array();
+ protected $aliases = array();
+ protected $scopes = array();
+ protected $scopeChildren = array();
+ protected $scopedServices = array();
+ protected $scopeStacks = array();
+ protected $loading = array();
+
+ private $underscoreMap = array('_' => '', '.' => '_', '\\' => '_');
+
+ /**
+ * @param ParameterBagInterface $parameterBag A ParameterBagInterface instance
+ */
+ public function __construct(ParameterBagInterface $parameterBag = null)
+ {
+ $this->parameterBag = $parameterBag ?: new ParameterBag();
+ }
+
+ /**
+ * Compiles the container.
+ *
+ * This method does two things:
+ *
+ * * Parameter values are resolved;
+ * * The parameter bag is frozen.
+ */
+ public function compile()
+ {
+ $this->parameterBag->resolve();
+
+ $this->parameterBag = new FrozenParameterBag($this->parameterBag->all());
+ }
+
+ /**
+ * Returns true if the container parameter bag are frozen.
+ *
+ * @return bool true if the container parameter bag are frozen, false otherwise
+ */
+ public function isFrozen()
+ {
+ return $this->parameterBag instanceof FrozenParameterBag;
+ }
+
+ /**
+ * Gets the service container parameter bag.
+ *
+ * @return ParameterBagInterface A ParameterBagInterface instance
+ */
+ public function getParameterBag()
+ {
+ return $this->parameterBag;
+ }
+
+ /**
+ * Gets a parameter.
+ *
+ * @param string $name The parameter name
+ *
+ * @return mixed The parameter value
+ *
+ * @throws InvalidArgumentException if the parameter is not defined
+ */
+ public function getParameter($name)
+ {
+ return $this->parameterBag->get($name);
+ }
+
+ /**
+ * Checks if a parameter exists.
+ *
+ * @param string $name The parameter name
+ *
+ * @return bool The presence of parameter in container
+ */
+ public function hasParameter($name)
+ {
+ return $this->parameterBag->has($name);
+ }
+
+ /**
+ * Sets a parameter.
+ *
+ * @param string $name The parameter name
+ * @param mixed $value The parameter value
+ */
+ public function setParameter($name, $value)
+ {
+ $this->parameterBag->set($name, $value);
+ }
+
+ /**
+ * Sets a service.
+ *
+ * Setting a service to null resets the service: has() returns false and get()
+ * behaves in the same way as if the service was never created.
+ *
+ * Note: The $scope parameter is deprecated since version 2.8 and will be removed in 3.0.
+ *
+ * @param string $id The service identifier
+ * @param object $service The service instance
+ * @param string $scope The scope of the service
+ *
+ * @throws RuntimeException When trying to set a service in an inactive scope
+ * @throws InvalidArgumentException When trying to set a service in the prototype scope
+ */
+ public function set($id, $service, $scope = self::SCOPE_CONTAINER)
+ {
+ if (!in_array($scope, array('container', 'request')) || ('request' === $scope && 'request' !== $id)) {
+ @trigger_error('The concept of container scopes is deprecated since version 2.8 and will be removed in 3.0. Omit the third parameter.', E_USER_DEPRECATED);
+ }
+
+ if (self::SCOPE_PROTOTYPE === $scope) {
+ throw new InvalidArgumentException(sprintf('You cannot set service "%s" of scope "prototype".', $id));
+ }
+
+ $id = strtolower($id);
+
+ if ('service_container' === $id) {
+ // BC: 'service_container' is no longer a self-reference but always
+ // $this, so ignore this call.
+ // @todo Throw InvalidArgumentException in next major release.
+ return;
+ }
+ if (self::SCOPE_CONTAINER !== $scope) {
+ if (!isset($this->scopedServices[$scope])) {
+ throw new RuntimeException(sprintf('You cannot set service "%s" of inactive scope.', $id));
+ }
+
+ $this->scopedServices[$scope][$id] = $service;
+ }
+
+ if (isset($this->aliases[$id])) {
+ unset($this->aliases[$id]);
+ }
+
+ $this->services[$id] = $service;
+
+ if (method_exists($this, $method = 'synchronize'.strtr($id, $this->underscoreMap).'Service')) {
+ $this->$method();
+ }
+
+ if (null === $service) {
+ if (self::SCOPE_CONTAINER !== $scope) {
+ unset($this->scopedServices[$scope][$id]);
+ }
+
+ unset($this->services[$id]);
+ }
+ }
+
+ /**
+ * Returns true if the given service is defined.
+ *
+ * @param string $id The service identifier
+ *
+ * @return bool true if the service is defined, false otherwise
+ */
+ public function has($id)
+ {
+ for ($i = 2;;) {
+ if ('service_container' === $id
+ || isset($this->aliases[$id])
+ || isset($this->services[$id])
+ || array_key_exists($id, $this->services)
+ ) {
+ return true;
+ }
+ if (--$i && $id !== $lcId = strtolower($id)) {
+ $id = $lcId;
+ } else {
+ return method_exists($this, 'get'.strtr($id, $this->underscoreMap).'Service');
+ }
+ }
+ }
+
+ /**
+ * Gets a service.
+ *
+ * If a service is defined both through a set() method and
+ * with a get{$id}Service() method, the former has always precedence.
+ *
+ * @param string $id The service identifier
+ * @param int $invalidBehavior The behavior when the service does not exist
+ *
+ * @return object The associated service
+ *
+ * @throws ServiceCircularReferenceException When a circular reference is detected
+ * @throws ServiceNotFoundException When the service is not defined
+ * @throws \Exception if an exception has been thrown when the service has been resolved
+ *
+ * @see Reference
+ */
+ public function get($id, $invalidBehavior = self::EXCEPTION_ON_INVALID_REFERENCE)
+ {
+ // Attempt to retrieve the service by checking first aliases then
+ // available services. Service IDs are case insensitive, however since
+ // this method can be called thousands of times during a request, avoid
+ // calling strtolower() unless necessary.
+ for ($i = 2;;) {
+ if ('service_container' === $id) {
+ return $this;
+ }
+ if (isset($this->aliases[$id])) {
+ $id = $this->aliases[$id];
+ }
+ // Re-use shared service instance if it exists.
+ if (isset($this->services[$id]) || array_key_exists($id, $this->services)) {
+ return $this->services[$id];
+ }
+
+ if (isset($this->loading[$id])) {
+ throw new ServiceCircularReferenceException($id, array_keys($this->loading));
+ }
+
+ if (isset($this->methodMap[$id])) {
+ $method = $this->methodMap[$id];
+ } elseif (--$i && $id !== $lcId = strtolower($id)) {
+ $id = $lcId;
+ continue;
+ } elseif (method_exists($this, $method = 'get'.strtr($id, $this->underscoreMap).'Service')) {
+ // $method is set to the right value, proceed
+ } else {
+ if (self::EXCEPTION_ON_INVALID_REFERENCE === $invalidBehavior) {
+ if (!$id) {
+ throw new ServiceNotFoundException($id);
+ }
+
+ $alternatives = array();
+ foreach ($this->getServiceIds() as $knownId) {
+ $lev = levenshtein($id, $knownId);
+ if ($lev <= strlen($id) / 3 || false !== strpos($knownId, $id)) {
+ $alternatives[] = $knownId;
+ }
+ }
+
+ throw new ServiceNotFoundException($id, null, null, $alternatives);
+ }
+
+ return;
+ }
+
+ $this->loading[$id] = true;
+
+ try {
+ $service = $this->$method();
+ } catch (\Exception $e) {
+ unset($this->loading[$id]);
+ unset($this->services[$id]);
+
+ if ($e instanceof InactiveScopeException && self::EXCEPTION_ON_INVALID_REFERENCE !== $invalidBehavior) {
+ return;
+ }
+
+ throw $e;
+ } catch (\Throwable $e) {
+ unset($this->loading[$id]);
+ unset($this->services[$id]);
+
+ throw $e;
+ }
+
+ unset($this->loading[$id]);
+
+ return $service;
+ }
+ }
+
+ /**
+ * Returns true if the given service has actually been initialized.
+ *
+ * @param string $id The service identifier
+ *
+ * @return bool true if service has already been initialized, false otherwise
+ */
+ public function initialized($id)
+ {
+ $id = strtolower($id);
+
+ if ('service_container' === $id) {
+ // BC: 'service_container' was a synthetic service previously.
+ // @todo Change to false in next major release.
+ return true;
+ }
+
+ if (isset($this->aliases[$id])) {
+ $id = $this->aliases[$id];
+ }
+
+ return isset($this->services[$id]) || array_key_exists($id, $this->services);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function reset()
+ {
+ if (!empty($this->scopedServices)) {
+ throw new LogicException('Resetting the container is not allowed when a scope is active.');
+ }
+
+ $this->services = array();
+ }
+
+ /**
+ * Gets all service ids.
+ *
+ * @return array An array of all defined service ids
+ */
+ public function getServiceIds()
+ {
+ $ids = array();
+ foreach (get_class_methods($this) as $method) {
+ if (preg_match('/^get(.+)Service$/', $method, $match)) {
+ $ids[] = self::underscore($match[1]);
+ }
+ }
+ $ids[] = 'service_container';
+
+ return array_unique(array_merge($ids, array_keys($this->services)));
+ }
+
+ /**
+ * This is called when you enter a scope.
+ *
+ * @param string $name
+ *
+ * @throws RuntimeException When the parent scope is inactive
+ * @throws InvalidArgumentException When the scope does not exist
+ *
+ * @deprecated since version 2.8, to be removed in 3.0.
+ */
+ public function enterScope($name)
+ {
+ if ('request' !== $name) {
+ @trigger_error('The '.__METHOD__.' method is deprecated since version 2.8 and will be removed in 3.0.', E_USER_DEPRECATED);
+ }
+
+ if (!isset($this->scopes[$name])) {
+ throw new InvalidArgumentException(sprintf('The scope "%s" does not exist.', $name));
+ }
+
+ if (self::SCOPE_CONTAINER !== $this->scopes[$name] && !isset($this->scopedServices[$this->scopes[$name]])) {
+ throw new RuntimeException(sprintf('The parent scope "%s" must be active when entering this scope.', $this->scopes[$name]));
+ }
+
+ // check if a scope of this name is already active, if so we need to
+ // remove all services of this scope, and those of any of its child
+ // scopes from the global services map
+ if (isset($this->scopedServices[$name])) {
+ $services = array($this->services, $name => $this->scopedServices[$name]);
+ unset($this->scopedServices[$name]);
+
+ foreach ($this->scopeChildren[$name] as $child) {
+ if (isset($this->scopedServices[$child])) {
+ $services[$child] = $this->scopedServices[$child];
+ unset($this->scopedServices[$child]);
+ }
+ }
+
+ // update global map
+ $this->services = call_user_func_array('array_diff_key', $services);
+ array_shift($services);
+
+ // add stack entry for this scope so we can restore the removed services later
+ if (!isset($this->scopeStacks[$name])) {
+ $this->scopeStacks[$name] = new \SplStack();
+ }
+ $this->scopeStacks[$name]->push($services);
+ }
+
+ $this->scopedServices[$name] = array();
+ }
+
+ /**
+ * This is called to leave the current scope, and move back to the parent
+ * scope.
+ *
+ * @param string $name The name of the scope to leave
+ *
+ * @throws InvalidArgumentException if the scope is not active
+ *
+ * @deprecated since version 2.8, to be removed in 3.0.
+ */
+ public function leaveScope($name)
+ {
+ if ('request' !== $name) {
+ @trigger_error('The '.__METHOD__.' method is deprecated since version 2.8 and will be removed in 3.0.', E_USER_DEPRECATED);
+ }
+
+ if (!isset($this->scopedServices[$name])) {
+ throw new InvalidArgumentException(sprintf('The scope "%s" is not active.', $name));
+ }
+
+ // remove all services of this scope, or any of its child scopes from
+ // the global service map
+ $services = array($this->services, $this->scopedServices[$name]);
+ unset($this->scopedServices[$name]);
+
+ foreach ($this->scopeChildren[$name] as $child) {
+ if (isset($this->scopedServices[$child])) {
+ $services[] = $this->scopedServices[$child];
+ unset($this->scopedServices[$child]);
+ }
+ }
+
+ // update global map
+ $this->services = call_user_func_array('array_diff_key', $services);
+
+ // check if we need to restore services of a previous scope of this type
+ if (isset($this->scopeStacks[$name]) && count($this->scopeStacks[$name]) > 0) {
+ $services = $this->scopeStacks[$name]->pop();
+ $this->scopedServices += $services;
+
+ if ($this->scopeStacks[$name]->isEmpty()) {
+ unset($this->scopeStacks[$name]);
+ }
+
+ foreach ($services as $array) {
+ foreach ($array as $id => $service) {
+ $this->set($id, $service, $name);
+ }
+ }
+ }
+ }
+
+ /**
+ * Adds a scope to the container.
+ *
+ * @param ScopeInterface $scope
+ *
+ * @throws InvalidArgumentException
+ *
+ * @deprecated since version 2.8, to be removed in 3.0.
+ */
+ public function addScope(ScopeInterface $scope)
+ {
+ $name = $scope->getName();
+ $parentScope = $scope->getParentName();
+
+ if ('request' !== $name) {
+ @trigger_error('The '.__METHOD__.' method is deprecated since version 2.8 and will be removed in 3.0.', E_USER_DEPRECATED);
+ }
+ if (self::SCOPE_CONTAINER === $name || self::SCOPE_PROTOTYPE === $name) {
+ throw new InvalidArgumentException(sprintf('The scope "%s" is reserved.', $name));
+ }
+ if (isset($this->scopes[$name])) {
+ throw new InvalidArgumentException(sprintf('A scope with name "%s" already exists.', $name));
+ }
+ if (self::SCOPE_CONTAINER !== $parentScope && !isset($this->scopes[$parentScope])) {
+ throw new InvalidArgumentException(sprintf('The parent scope "%s" does not exist, or is invalid.', $parentScope));
+ }
+
+ $this->scopes[$name] = $parentScope;
+ $this->scopeChildren[$name] = array();
+
+ // normalize the child relations
+ while ($parentScope !== self::SCOPE_CONTAINER) {
+ $this->scopeChildren[$parentScope][] = $name;
+ $parentScope = $this->scopes[$parentScope];
+ }
+ }
+
+ /**
+ * Returns whether this container has a certain scope.
+ *
+ * @param string $name The name of the scope
+ *
+ * @return bool
+ *
+ * @deprecated since version 2.8, to be removed in 3.0.
+ */
+ public function hasScope($name)
+ {
+ if ('request' !== $name) {
+ @trigger_error('The '.__METHOD__.' method is deprecated since version 2.8 and will be removed in 3.0.', E_USER_DEPRECATED);
+ }
+
+ return isset($this->scopes[$name]);
+ }
+
+ /**
+ * Returns whether this scope is currently active.
+ *
+ * This does not actually check if the passed scope actually exists.
+ *
+ * @param string $name
+ *
+ * @return bool
+ *
+ * @deprecated since version 2.8, to be removed in 3.0.
+ */
+ public function isScopeActive($name)
+ {
+ @trigger_error('The '.__METHOD__.' method is deprecated since version 2.8 and will be removed in 3.0.', E_USER_DEPRECATED);
+
+ return isset($this->scopedServices[$name]);
+ }
+
+ /**
+ * Camelizes a string.
+ *
+ * @param string $id A string to camelize
+ *
+ * @return string The camelized string
+ */
+ public static function camelize($id)
+ {
+ return strtr(ucwords(strtr($id, array('_' => ' ', '.' => '_ ', '\\' => '_ '))), array(' ' => ''));
+ }
+
+ /**
+ * A string to underscore.
+ *
+ * @param string $id The string to underscore
+ *
+ * @return string The underscored string
+ */
+ public static function underscore($id)
+ {
+ return strtolower(preg_replace(array('/([A-Z]+)([A-Z][a-z])/', '/([a-z\d])([A-Z])/'), array('\\1_\\2', '\\1_\\2'), str_replace('_', '.', $id)));
+ }
+
+ private function __clone()
+ {
+ }
+}
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