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vendor/symfony/event-dispatcher/CHANGELOG.md

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+CHANGELOG
+=========
+
+4.1.0
+-----
+
+ * added support for invokable event listeners tagged with `kernel.event_listener` by default 
+ * The `TraceableEventDispatcher::getOrphanedEvents()` method has been added.
+ * The `TraceableEventDispatcherInterface` has been deprecated.
+
+4.0.0
+-----
+
+ * removed the `ContainerAwareEventDispatcher` class
+ * added the `reset()` method to the `TraceableEventDispatcherInterface`
+
+3.4.0
+-----
+
+  * Implementing `TraceableEventDispatcherInterface` without the `reset()` method has been deprecated.
+
+3.3.0
+-----
+
+  * The ContainerAwareEventDispatcher class has been deprecated. Use EventDispatcher with closure factories instead.
+
+3.0.0
+-----
+
+  * The method `getListenerPriority($eventName, $listener)` has been added to the
+    `EventDispatcherInterface`.
+  * The methods `Event::setDispatcher()`, `Event::getDispatcher()`, `Event::setName()`
+    and `Event::getName()` have been removed.
+    The event dispatcher and the event name are passed to the listener call.
+
+2.5.0
+-----
+
+ * added Debug\TraceableEventDispatcher (originally in HttpKernel)
+ * changed Debug\TraceableEventDispatcherInterface to extend EventDispatcherInterface
+ * added RegisterListenersPass (originally in HttpKernel)
+
+2.1.0
+-----
+
+ * added TraceableEventDispatcherInterface
+ * added ContainerAwareEventDispatcher
+ * added a reference to the EventDispatcher on the Event
+ * added a reference to the Event name on the event
+ * added fluid interface to the dispatch() method which now returns the Event
+   object
+ * added GenericEvent event class
+ * added the possibility for subscribers to subscribe several times for the
+   same event
+ * added ImmutableEventDispatcher

vendor/symfony/event-dispatcher/Debug/TraceableEventDispatcher.php

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+<?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\EventDispatcher\Debug;
+
+use Psr\Log\LoggerInterface;
+use Symfony\Component\EventDispatcher\Event;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\Stopwatch\Stopwatch;
+
+/**
+ * Collects some data about event listeners.
+ *
+ * This event dispatcher delegates the dispatching to another one.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class TraceableEventDispatcher implements TraceableEventDispatcherInterface
+{
+    protected $logger;
+    protected $stopwatch;
+
+    private $callStack;
+    private $dispatcher;
+    private $wrappedListeners;
+    private $orphanedEvents;
+
+    public function __construct(EventDispatcherInterface $dispatcher, Stopwatch $stopwatch, LoggerInterface $logger = null)
+    {
+        $this->dispatcher = $dispatcher;
+        $this->stopwatch = $stopwatch;
+        $this->logger = $logger;
+        $this->wrappedListeners = [];
+        $this->orphanedEvents = [];
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function addListener($eventName, $listener, $priority = 0)
+    {
+        $this->dispatcher->addListener($eventName, $listener, $priority);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function addSubscriber(EventSubscriberInterface $subscriber)
+    {
+        $this->dispatcher->addSubscriber($subscriber);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function removeListener($eventName, $listener)
+    {
+        if (isset($this->wrappedListeners[$eventName])) {
+            foreach ($this->wrappedListeners[$eventName] as $index => $wrappedListener) {
+                if ($wrappedListener->getWrappedListener() === $listener) {
+                    $listener = $wrappedListener;
+                    unset($this->wrappedListeners[$eventName][$index]);
+                    break;
+                }
+            }
+        }
+
+        return $this->dispatcher->removeListener($eventName, $listener);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function removeSubscriber(EventSubscriberInterface $subscriber)
+    {
+        return $this->dispatcher->removeSubscriber($subscriber);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getListeners($eventName = null)
+    {
+        return $this->dispatcher->getListeners($eventName);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getListenerPriority($eventName, $listener)
+    {
+        // we might have wrapped listeners for the event (if called while dispatching)
+        // in that case get the priority by wrapper
+        if (isset($this->wrappedListeners[$eventName])) {
+            foreach ($this->wrappedListeners[$eventName] as $index => $wrappedListener) {
+                if ($wrappedListener->getWrappedListener() === $listener) {
+                    return $this->dispatcher->getListenerPriority($eventName, $wrappedListener);
+                }
+            }
+        }
+
+        return $this->dispatcher->getListenerPriority($eventName, $listener);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function hasListeners($eventName = null)
+    {
+        return $this->dispatcher->hasListeners($eventName);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function dispatch($eventName, Event $event = null)
+    {
+        if (null === $this->callStack) {
+            $this->callStack = new \SplObjectStorage();
+        }
+
+        if (null === $event) {
+            $event = new Event();
+        }
+
+        if (null !== $this->logger && $event->isPropagationStopped()) {
+            $this->logger->debug(sprintf('The "%s" event is already stopped. No listeners have been called.', $eventName));
+        }
+
+        $this->preProcess($eventName);
+        try {
+            $this->preDispatch($eventName, $event);
+            try {
+                $e = $this->stopwatch->start($eventName, 'section');
+                try {
+                    $this->dispatcher->dispatch($eventName, $event);
+                } finally {
+                    if ($e->isStarted()) {
+                        $e->stop();
+                    }
+                }
+            } finally {
+                $this->postDispatch($eventName, $event);
+            }
+        } finally {
+            $this->postProcess($eventName);
+        }
+
+        return $event;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getCalledListeners()
+    {
+        if (null === $this->callStack) {
+            return [];
+        }
+
+        $called = [];
+        foreach ($this->callStack as $listener) {
+            list($eventName) = $this->callStack->getInfo();
+
+            $called[] = $listener->getInfo($eventName);
+        }
+
+        return $called;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getNotCalledListeners()
+    {
+        try {
+            $allListeners = $this->getListeners();
+        } catch (\Exception $e) {
+            if (null !== $this->logger) {
+                $this->logger->info('An exception was thrown while getting the uncalled listeners.', ['exception' => $e]);
+            }
+
+            // unable to retrieve the uncalled listeners
+            return [];
+        }
+
+        $calledListeners = [];
+
+        if (null !== $this->callStack) {
+            foreach ($this->callStack as $calledListener) {
+                $calledListeners[] = $calledListener->getWrappedListener();
+            }
+        }
+
+        $notCalled = [];
+        foreach ($allListeners as $eventName => $listeners) {
+            foreach ($listeners as $listener) {
+                if (!\in_array($listener, $calledListeners, true)) {
+                    if (!$listener instanceof WrappedListener) {
+                        $listener = new WrappedListener($listener, null, $this->stopwatch, $this);
+                    }
+                    $notCalled[] = $listener->getInfo($eventName);
+                }
+            }
+        }
+
+        uasort($notCalled, [$this, 'sortNotCalledListeners']);
+
+        return $notCalled;
+    }
+
+    public function getOrphanedEvents(): array
+    {
+        return $this->orphanedEvents;
+    }
+
+    public function reset()
+    {
+        $this->callStack = null;
+        $this->orphanedEvents = [];
+    }
+
+    /**
+     * Proxies all method calls to the original event dispatcher.
+     *
+     * @param string $method    The method name
+     * @param array  $arguments The method arguments
+     *
+     * @return mixed
+     */
+    public function __call($method, $arguments)
+    {
+        return $this->dispatcher->{$method}(...$arguments);
+    }
+
+    /**
+     * Called before dispatching the event.
+     *
+     * @param string $eventName The event name
+     * @param Event  $event     The event
+     */
+    protected function preDispatch($eventName, Event $event)
+    {
+    }
+
+    /**
+     * Called after dispatching the event.
+     *
+     * @param string $eventName The event name
+     * @param Event  $event     The event
+     */
+    protected function postDispatch($eventName, Event $event)
+    {
+    }
+
+    private function preProcess($eventName)
+    {
+        if (!$this->dispatcher->hasListeners($eventName)) {
+            $this->orphanedEvents[] = $eventName;
+
+            return;
+        }
+
+        foreach ($this->dispatcher->getListeners($eventName) as $listener) {
+            $priority = $this->getListenerPriority($eventName, $listener);
+            $wrappedListener = new WrappedListener($listener instanceof WrappedListener ? $listener->getWrappedListener() : $listener, null, $this->stopwatch, $this);
+            $this->wrappedListeners[$eventName][] = $wrappedListener;
+            $this->dispatcher->removeListener($eventName, $listener);
+            $this->dispatcher->addListener($eventName, $wrappedListener, $priority);
+            $this->callStack->attach($wrappedListener, [$eventName]);
+        }
+    }
+
+    private function postProcess($eventName)
+    {
+        unset($this->wrappedListeners[$eventName]);
+        $skipped = false;
+        foreach ($this->dispatcher->getListeners($eventName) as $listener) {
+            if (!$listener instanceof WrappedListener) { // #12845: a new listener was added during dispatch.
+                continue;
+            }
+            // Unwrap listener
+            $priority = $this->getListenerPriority($eventName, $listener);
+            $this->dispatcher->removeListener($eventName, $listener);
+            $this->dispatcher->addListener($eventName, $listener->getWrappedListener(), $priority);
+
+            if (null !== $this->logger) {
+                $context = ['event' => $eventName, 'listener' => $listener->getPretty()];
+            }
+
+            if ($listener->wasCalled()) {
+                if (null !== $this->logger) {
+                    $this->logger->debug('Notified event "{event}" to listener "{listener}".', $context);
+                }
+            } else {
+                $this->callStack->detach($listener);
+            }
+
+            if (null !== $this->logger && $skipped) {
+                $this->logger->debug('Listener "{listener}" was not called for event "{event}".', $context);
+            }
+
+            if ($listener->stoppedPropagation()) {
+                if (null !== $this->logger) {
+                    $this->logger->debug('Listener "{listener}" stopped propagation of the event "{event}".', $context);
+                }
+
+                $skipped = true;
+            }
+        }
+    }
+
+    private function sortNotCalledListeners(array $a, array $b)
+    {
+        if (0 !== $cmp = strcmp($a['event'], $b['event'])) {
+            return $cmp;
+        }
+
+        if (\is_int($a['priority']) && !\is_int($b['priority'])) {
+            return 1;
+        }
+
+        if (!\is_int($a['priority']) && \is_int($b['priority'])) {
+            return -1;
+        }
+
+        if ($a['priority'] === $b['priority']) {
+            return 0;
+        }
+
+        if ($a['priority'] > $b['priority']) {
+            return -1;
+        }
+
+        return 1;
+    }
+}

vendor/symfony/event-dispatcher/Debug/TraceableEventDispatcherInterface.php

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+<?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\EventDispatcher\Debug;
+
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Contracts\Service\ResetInterface;
+
+/**
+ * @deprecated since Symfony 4.1
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+interface TraceableEventDispatcherInterface extends EventDispatcherInterface, ResetInterface
+{
+    /**
+     * Gets the called listeners.
+     *
+     * @return array An array of called listeners
+     */
+    public function getCalledListeners();
+
+    /**
+     * Gets the not called listeners.
+     *
+     * @return array An array of not called listeners
+     */
+    public function getNotCalledListeners();
+}

vendor/symfony/event-dispatcher/Debug/WrappedListener.php

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+<?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\EventDispatcher\Debug;
+
+use Symfony\Component\EventDispatcher\Event;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\Stopwatch\Stopwatch;
+use Symfony\Component\VarDumper\Caster\ClassStub;
+
+/**
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class WrappedListener
+{
+    private $listener;
+    private $name;
+    private $called;
+    private $stoppedPropagation;
+    private $stopwatch;
+    private $dispatcher;
+    private $pretty;
+    private $stub;
+    private $priority;
+    private static $hasClassStub;
+
+    public function __construct($listener, $name, Stopwatch $stopwatch, EventDispatcherInterface $dispatcher = null)
+    {
+        $this->listener = $listener;
+        $this->stopwatch = $stopwatch;
+        $this->dispatcher = $dispatcher;
+        $this->called = false;
+        $this->stoppedPropagation = false;
+
+        if (\is_array($listener)) {
+            $this->name = \is_object($listener[0]) ? \get_class($listener[0]) : $listener[0];
+            $this->pretty = $this->name.'::'.$listener[1];
+        } elseif ($listener instanceof \Closure) {
+            $r = new \ReflectionFunction($listener);
+            if (false !== strpos($r->name, '{closure}')) {
+                $this->pretty = $this->name = 'closure';
+            } elseif ($class = $r->getClosureScopeClass()) {
+                $this->name = $class->name;
+                $this->pretty = $this->name.'::'.$r->name;
+            } else {
+                $this->pretty = $this->name = $r->name;
+            }
+        } elseif (\is_string($listener)) {
+            $this->pretty = $this->name = $listener;
+        } else {
+            $this->name = \get_class($listener);
+            $this->pretty = $this->name.'::__invoke';
+        }
+
+        if (null !== $name) {
+            $this->name = $name;
+        }
+
+        if (null === self::$hasClassStub) {
+            self::$hasClassStub = class_exists(ClassStub::class);
+        }
+    }
+
+    public function getWrappedListener()
+    {
+        return $this->listener;
+    }
+
+    public function wasCalled()
+    {
+        return $this->called;
+    }
+
+    public function stoppedPropagation()
+    {
+        return $this->stoppedPropagation;
+    }
+
+    public function getPretty()
+    {
+        return $this->pretty;
+    }
+
+    public function getInfo($eventName)
+    {
+        if (null === $this->stub) {
+            $this->stub = self::$hasClassStub ? new ClassStub($this->pretty.'()', $this->listener) : $this->pretty.'()';
+        }
+
+        return [
+            'event' => $eventName,
+            'priority' => null !== $this->priority ? $this->priority : (null !== $this->dispatcher ? $this->dispatcher->getListenerPriority($eventName, $this->listener) : null),
+            'pretty' => $this->pretty,
+            'stub' => $this->stub,
+        ];
+    }
+
+    public function __invoke(Event $event, $eventName, EventDispatcherInterface $dispatcher)
+    {
+        $dispatcher = $this->dispatcher ?: $dispatcher;
+
+        $this->called = true;
+        $this->priority = $dispatcher->getListenerPriority($eventName, $this->listener);
+
+        $e = $this->stopwatch->start($this->name, 'event_listener');
+
+        ($this->listener)($event, $eventName, $dispatcher);
+
+        if ($e->isStarted()) {
+            $e->stop();
+        }
+
+        if ($event->isPropagationStopped()) {
+            $this->stoppedPropagation = true;
+        }
+    }
+}

vendor/symfony/event-dispatcher/DependencyInjection/RegisterListenersPass.php

@@ -0,0 +1,136 @@
+<?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\EventDispatcher\DependencyInjection;
+
+use Symfony\Component\DependencyInjection\Argument\ServiceClosureArgument;
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
+use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\EventDispatcher\EventDispatcher;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+
+/**
+ * Compiler pass to register tagged services for an event dispatcher.
+ */
+class RegisterListenersPass implements CompilerPassInterface
+{
+    protected $dispatcherService;
+    protected $listenerTag;
+    protected $subscriberTag;
+
+    private $hotPathEvents = [];
+    private $hotPathTagName;
+
+    public function __construct(string $dispatcherService = 'event_dispatcher', string $listenerTag = 'kernel.event_listener', string $subscriberTag = 'kernel.event_subscriber')
+    {
+        $this->dispatcherService = $dispatcherService;
+        $this->listenerTag = $listenerTag;
+        $this->subscriberTag = $subscriberTag;
+    }
+
+    public function setHotPathEvents(array $hotPathEvents, $tagName = 'container.hot_path')
+    {
+        $this->hotPathEvents = array_flip($hotPathEvents);
+        $this->hotPathTagName = $tagName;
+
+        return $this;
+    }
+
+    public function process(ContainerBuilder $container)
+    {
+        if (!$container->hasDefinition($this->dispatcherService) && !$container->hasAlias($this->dispatcherService)) {
+            return;
+        }
+
+        $definition = $container->findDefinition($this->dispatcherService);
+
+        foreach ($container->findTaggedServiceIds($this->listenerTag, true) as $id => $events) {
+            foreach ($events as $event) {
+                $priority = isset($event['priority']) ? $event['priority'] : 0;
+
+                if (!isset($event['event'])) {
+                    throw new InvalidArgumentException(sprintf('Service "%s" must define the "event" attribute on "%s" tags.', $id, $this->listenerTag));
+                }
+
+                if (!isset($event['method'])) {
+                    $event['method'] = 'on'.preg_replace_callback([
+                        '/(?<=\b)[a-z]/i',
+                        '/[^a-z0-9]/i',
+                    ], function ($matches) { return strtoupper($matches[0]); }, $event['event']);
+                    $event['method'] = preg_replace('/[^a-z0-9]/i', '', $event['method']);
+
+                    if (null !== ($class = $container->getDefinition($id)->getClass()) && ($r = $container->getReflectionClass($class, false)) && !$r->hasMethod($event['method']) && $r->hasMethod('__invoke')) {
+                        $event['method'] = '__invoke';
+                    }
+                }
+
+                $definition->addMethodCall('addListener', [$event['event'], [new ServiceClosureArgument(new Reference($id)), $event['method']], $priority]);
+
+                if (isset($this->hotPathEvents[$event['event']])) {
+                    $container->getDefinition($id)->addTag($this->hotPathTagName);
+                }
+            }
+        }
+
+        $extractingDispatcher = new ExtractingEventDispatcher();
+
+        foreach ($container->findTaggedServiceIds($this->subscriberTag, true) as $id => $attributes) {
+            $def = $container->getDefinition($id);
+
+            // We must assume that the class value has been correctly filled, even if the service is created by a factory
+            $class = $def->getClass();
+
+            if (!$r = $container->getReflectionClass($class)) {
+                throw new InvalidArgumentException(sprintf('Class "%s" used for service "%s" cannot be found.', $class, $id));
+            }
+            if (!$r->isSubclassOf(EventSubscriberInterface::class)) {
+                throw new InvalidArgumentException(sprintf('Service "%s" must implement interface "%s".', $id, EventSubscriberInterface::class));
+            }
+            $class = $r->name;
+
+            ExtractingEventDispatcher::$subscriber = $class;
+            $extractingDispatcher->addSubscriber($extractingDispatcher);
+            foreach ($extractingDispatcher->listeners as $args) {
+                $args[1] = [new ServiceClosureArgument(new Reference($id)), $args[1]];
+                $definition->addMethodCall('addListener', $args);
+
+                if (isset($this->hotPathEvents[$args[0]])) {
+                    $container->getDefinition($id)->addTag($this->hotPathTagName);
+                }
+            }
+            $extractingDispatcher->listeners = [];
+        }
+    }
+}
+
+/**
+ * @internal
+ */
+class ExtractingEventDispatcher extends EventDispatcher implements EventSubscriberInterface
+{
+    public $listeners = [];
+
+    public static $subscriber;
+
+    public function addListener($eventName, $listener, $priority = 0)
+    {
+        $this->listeners[] = [$eventName, $listener[1], $priority];
+    }
+
+    public static function getSubscribedEvents()
+    {
+        $callback = [self::$subscriber, 'getSubscribedEvents'];
+
+        return $callback();
+    }
+}

vendor/symfony/event-dispatcher/Event.php

@@ -0,0 +1,58 @@
+<?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\EventDispatcher;
+
+/**
+ * Event is the base class for classes containing event data.
+ *
+ * This class contains no event data. It is used by events that do not pass
+ * state information to an event handler when an event is raised.
+ *
+ * You can call the method stopPropagation() to abort the execution of
+ * further listeners in your event listener.
+ *
+ * @author Guilherme Blanco <guilhermeblanco@hotmail.com>
+ * @author Jonathan Wage <jonwage@gmail.com>
+ * @author Roman Borschel <roman@code-factory.org>
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+class Event
+{
+    /**
+     * @var bool Whether no further event listeners should be triggered
+     */
+    private $propagationStopped = false;
+
+    /**
+     * Returns whether further event listeners should be triggered.
+     *
+     * @see Event::stopPropagation()
+     *
+     * @return bool Whether propagation was already stopped for this event
+     */
+    public function isPropagationStopped()
+    {
+        return $this->propagationStopped;
+    }
+
+    /**
+     * Stops the propagation of the event to further event listeners.
+     *
+     * If multiple event listeners are connected to the same event, no
+     * further event listener will be triggered once any trigger calls
+     * stopPropagation().
+     */
+    public function stopPropagation()
+    {
+        $this->propagationStopped = true;
+    }
+}

vendor/symfony/event-dispatcher/EventDispatcher.php

@@ -0,0 +1,236 @@
+<?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\EventDispatcher;
+
+/**
+ * The EventDispatcherInterface is the central point of Symfony's event listener system.
+ *
+ * Listeners are registered on the manager and events are dispatched through the
+ * manager.
+ *
+ * @author Guilherme Blanco <guilhermeblanco@hotmail.com>
+ * @author Jonathan Wage <jonwage@gmail.com>
+ * @author Roman Borschel <roman@code-factory.org>
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @author Jordi Boggiano <j.boggiano@seld.be>
+ * @author Jordan Alliot <jordan.alliot@gmail.com>
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+class EventDispatcher implements EventDispatcherInterface
+{
+    private $listeners = [];
+    private $sorted = [];
+
+    /**
+     * {@inheritdoc}
+     */
+    public function dispatch($eventName, Event $event = null)
+    {
+        if (null === $event) {
+            $event = new Event();
+        }
+
+        if ($listeners = $this->getListeners($eventName)) {
+            $this->doDispatch($listeners, $eventName, $event);
+        }
+
+        return $event;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getListeners($eventName = null)
+    {
+        if (null !== $eventName) {
+            if (empty($this->listeners[$eventName])) {
+                return [];
+            }
+
+            if (!isset($this->sorted[$eventName])) {
+                $this->sortListeners($eventName);
+            }
+
+            return $this->sorted[$eventName];
+        }
+
+        foreach ($this->listeners as $eventName => $eventListeners) {
+            if (!isset($this->sorted[$eventName])) {
+                $this->sortListeners($eventName);
+            }
+        }
+
+        return array_filter($this->sorted);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getListenerPriority($eventName, $listener)
+    {
+        if (empty($this->listeners[$eventName])) {
+            return;
+        }
+
+        if (\is_array($listener) && isset($listener[0]) && $listener[0] instanceof \Closure) {
+            $listener[0] = $listener[0]();
+        }
+
+        foreach ($this->listeners[$eventName] as $priority => $listeners) {
+            foreach ($listeners as $k => $v) {
+                if ($v !== $listener && \is_array($v) && isset($v[0]) && $v[0] instanceof \Closure) {
+                    $v[0] = $v[0]();
+                    $this->listeners[$eventName][$priority][$k] = $v;
+                }
+                if ($v === $listener) {
+                    return $priority;
+                }
+            }
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function hasListeners($eventName = null)
+    {
+        if (null !== $eventName) {
+            return !empty($this->listeners[$eventName]);
+        }
+
+        foreach ($this->listeners as $eventListeners) {
+            if ($eventListeners) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function addListener($eventName, $listener, $priority = 0)
+    {
+        $this->listeners[$eventName][$priority][] = $listener;
+        unset($this->sorted[$eventName]);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function removeListener($eventName, $listener)
+    {
+        if (empty($this->listeners[$eventName])) {
+            return;
+        }
+
+        if (\is_array($listener) && isset($listener[0]) && $listener[0] instanceof \Closure) {
+            $listener[0] = $listener[0]();
+        }
+
+        foreach ($this->listeners[$eventName] as $priority => $listeners) {
+            foreach ($listeners as $k => $v) {
+                if ($v !== $listener && \is_array($v) && isset($v[0]) && $v[0] instanceof \Closure) {
+                    $v[0] = $v[0]();
+                }
+                if ($v === $listener) {
+                    unset($listeners[$k], $this->sorted[$eventName]);
+                } else {
+                    $listeners[$k] = $v;
+                }
+            }
+
+            if ($listeners) {
+                $this->listeners[$eventName][$priority] = $listeners;
+            } else {
+                unset($this->listeners[$eventName][$priority]);
+            }
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function addSubscriber(EventSubscriberInterface $subscriber)
+    {
+        foreach ($subscriber->getSubscribedEvents() as $eventName => $params) {
+            if (\is_string($params)) {
+                $this->addListener($eventName, [$subscriber, $params]);
+            } elseif (\is_string($params[0])) {
+                $this->addListener($eventName, [$subscriber, $params[0]], isset($params[1]) ? $params[1] : 0);
+            } else {
+                foreach ($params as $listener) {
+                    $this->addListener($eventName, [$subscriber, $listener[0]], isset($listener[1]) ? $listener[1] : 0);
+                }
+            }
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function removeSubscriber(EventSubscriberInterface $subscriber)
+    {
+        foreach ($subscriber->getSubscribedEvents() as $eventName => $params) {
+            if (\is_array($params) && \is_array($params[0])) {
+                foreach ($params as $listener) {
+                    $this->removeListener($eventName, [$subscriber, $listener[0]]);
+                }
+            } else {
+                $this->removeListener($eventName, [$subscriber, \is_string($params) ? $params : $params[0]]);
+            }
+        }
+    }
+
+    /**
+     * Triggers the listeners of an event.
+     *
+     * This method can be overridden to add functionality that is executed
+     * for each listener.
+     *
+     * @param callable[] $listeners The event listeners
+     * @param string     $eventName The name of the event to dispatch
+     * @param Event      $event     The event object to pass to the event handlers/listeners
+     */
+    protected function doDispatch($listeners, $eventName, Event $event)
+    {
+        foreach ($listeners as $listener) {
+            if ($event->isPropagationStopped()) {
+                break;
+            }
+            $listener($event, $eventName, $this);
+        }
+    }
+
+    /**
+     * Sorts the internal list of listeners for the given event by priority.
+     *
+     * @param string $eventName The name of the event
+     */
+    private function sortListeners($eventName)
+    {
+        krsort($this->listeners[$eventName]);
+        $this->sorted[$eventName] = [];
+
+        foreach ($this->listeners[$eventName] as $priority => $listeners) {
+            foreach ($listeners as $k => $listener) {
+                if (\is_array($listener) && isset($listener[0]) && $listener[0] instanceof \Closure) {
+                    $listener[0] = $listener[0]();
+                    $this->listeners[$eventName][$priority][$k] = $listener;
+                }
+                $this->sorted[$eventName][] = $listener;
+            }
+        }
+    }
+}

vendor/symfony/event-dispatcher/EventDispatcherInterface.php

@@ -0,0 +1,93 @@
+<?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\EventDispatcher;
+
+/**
+ * The EventDispatcherInterface is the central point of Symfony's event listener system.
+ * Listeners are registered on the manager and events are dispatched through the
+ * manager.
+ *
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+interface EventDispatcherInterface
+{
+    /**
+     * Dispatches an event to all registered listeners.
+     *
+     * @param string     $eventName The name of the event to dispatch. The name of
+     *                              the event is the name of the method that is
+     *                              invoked on listeners.
+     * @param Event|null $event     The event to pass to the event handlers/listeners
+     *                              If not supplied, an empty Event instance is created
+     *
+     * @return Event
+     */
+    public function dispatch($eventName, Event $event = null);
+
+    /**
+     * Adds an event listener that listens on the specified events.
+     *
+     * @param string   $eventName The event to listen on
+     * @param callable $listener  The listener
+     * @param int      $priority  The higher this value, the earlier an event
+     *                            listener will be triggered in the chain (defaults to 0)
+     */
+    public function addListener($eventName, $listener, $priority = 0);
+
+    /**
+     * Adds an event subscriber.
+     *
+     * The subscriber is asked for all the events it is
+     * interested in and added as a listener for these events.
+     */
+    public function addSubscriber(EventSubscriberInterface $subscriber);
+
+    /**
+     * Removes an event listener from the specified events.
+     *
+     * @param string   $eventName The event to remove a listener from
+     * @param callable $listener  The listener to remove
+     */
+    public function removeListener($eventName, $listener);
+
+    public function removeSubscriber(EventSubscriberInterface $subscriber);
+
+    /**
+     * Gets the listeners of a specific event or all listeners sorted by descending priority.
+     *
+     * @param string|null $eventName The name of the event
+     *
+     * @return array The event listeners for the specified event, or all event listeners by event name
+     */
+    public function getListeners($eventName = null);
+
+    /**
+     * Gets the listener priority for a specific event.
+     *
+     * Returns null if the event or the listener does not exist.
+     *
+     * @param string   $eventName The name of the event
+     * @param callable $listener  The listener
+     *
+     * @return int|null The event listener priority
+     */
+    public function getListenerPriority($eventName, $listener);
+
+    /**
+     * Checks whether an event has any registered listeners.
+     *
+     * @param string|null $eventName The name of the event
+     *
+     * @return bool true if the specified event has any listeners, false otherwise
+     */
+    public function hasListeners($eventName = null);
+}

vendor/symfony/event-dispatcher/EventSubscriberInterface.php

@@ -0,0 +1,46 @@
+<?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\EventDispatcher;
+
+/**
+ * An EventSubscriber knows itself what events it is interested in.
+ * If an EventSubscriber is added to an EventDispatcherInterface, the manager invokes
+ * {@link getSubscribedEvents} and registers the subscriber as a listener for all
+ * returned events.
+ *
+ * @author Guilherme Blanco <guilhermeblanco@hotmail.com>
+ * @author Jonathan Wage <jonwage@gmail.com>
+ * @author Roman Borschel <roman@code-factory.org>
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+interface EventSubscriberInterface
+{
+    /**
+     * Returns an array of event names this subscriber wants to listen to.
+     *
+     * The array keys are event names and the value can be:
+     *
+     *  * The method name to call (priority defaults to 0)
+     *  * An array composed of the method name to call and the priority
+     *  * An array of arrays composed of the method names to call and respective
+     *    priorities, or 0 if unset
+     *
+     * For instance:
+     *
+     *  * ['eventName' => 'methodName']
+     *  * ['eventName' => ['methodName', $priority]]
+     *  * ['eventName' => [['methodName1', $priority], ['methodName2']]]
+     *
+     * @return array The event names to listen to
+     */
+    public static function getSubscribedEvents();
+}

vendor/symfony/event-dispatcher/GenericEvent.php

@@ -0,0 +1,175 @@
+<?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\EventDispatcher;
+
+/**
+ * Event encapsulation class.
+ *
+ * Encapsulates events thus decoupling the observer from the subject they encapsulate.
+ *
+ * @author Drak <drak@zikula.org>
+ */
+class GenericEvent extends Event implements \ArrayAccess, \IteratorAggregate
+{
+    protected $subject;
+    protected $arguments;
+
+    /**
+     * Encapsulate an event with $subject and $args.
+     *
+     * @param mixed $subject   The subject of the event, usually an object or a callable
+     * @param array $arguments Arguments to store in the event
+     */
+    public function __construct($subject = null, array $arguments = [])
+    {
+        $this->subject = $subject;
+        $this->arguments = $arguments;
+    }
+
+    /**
+     * Getter for subject property.
+     *
+     * @return mixed The observer subject
+     */
+    public function getSubject()
+    {
+        return $this->subject;
+    }
+
+    /**
+     * Get argument by key.
+     *
+     * @param string $key Key
+     *
+     * @return mixed Contents of array key
+     *
+     * @throws \InvalidArgumentException if key is not found
+     */
+    public function getArgument($key)
+    {
+        if ($this->hasArgument($key)) {
+            return $this->arguments[$key];
+        }
+
+        throw new \InvalidArgumentException(sprintf('Argument "%s" not found.', $key));
+    }
+
+    /**
+     * Add argument to event.
+     *
+     * @param string $key   Argument name
+     * @param mixed  $value Value
+     *
+     * @return $this
+     */
+    public function setArgument($key, $value)
+    {
+        $this->arguments[$key] = $value;
+
+        return $this;
+    }
+
+    /**
+     * Getter for all arguments.
+     *
+     * @return array
+     */
+    public function getArguments()
+    {
+        return $this->arguments;
+    }
+
+    /**
+     * Set args property.
+     *
+     * @param array $args Arguments
+     *
+     * @return $this
+     */
+    public function setArguments(array $args = [])
+    {
+        $this->arguments = $args;
+
+        return $this;
+    }
+
+    /**
+     * Has argument.
+     *
+     * @param string $key Key of arguments array
+     *
+     * @return bool
+     */
+    public function hasArgument($key)
+    {
+        return \array_key_exists($key, $this->arguments);
+    }
+
+    /**
+     * ArrayAccess for argument getter.
+     *
+     * @param string $key Array key
+     *
+     * @return mixed
+     *
+     * @throws \InvalidArgumentException if key does not exist in $this->args
+     */
+    public function offsetGet($key)
+    {
+        return $this->getArgument($key);
+    }
+
+    /**
+     * ArrayAccess for argument setter.
+     *
+     * @param string $key   Array key to set
+     * @param mixed  $value Value
+     */
+    public function offsetSet($key, $value)
+    {
+        $this->setArgument($key, $value);
+    }
+
+    /**
+     * ArrayAccess for unset argument.
+     *
+     * @param string $key Array key
+     */
+    public function offsetUnset($key)
+    {
+        if ($this->hasArgument($key)) {
+            unset($this->arguments[$key]);
+        }
+    }
+
+    /**
+     * ArrayAccess has argument.
+     *
+     * @param string $key Array key
+     *
+     * @return bool
+     */
+    public function offsetExists($key)
+    {
+        return $this->hasArgument($key);
+    }
+
+    /**
+     * IteratorAggregate for iterating over the object like an array.
+     *
+     * @return \ArrayIterator
+     */
+    public function getIterator()
+    {
+        return new \ArrayIterator($this->arguments);
+    }
+}

vendor/symfony/event-dispatcher/ImmutableEventDispatcher.php

@@ -0,0 +1,91 @@
+<?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\EventDispatcher;
+
+/**
+ * A read-only proxy for an event dispatcher.
+ *
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+class ImmutableEventDispatcher implements EventDispatcherInterface
+{
+    private $dispatcher;
+
+    public function __construct(EventDispatcherInterface $dispatcher)
+    {
+        $this->dispatcher = $dispatcher;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function dispatch($eventName, Event $event = null)
+    {
+        return $this->dispatcher->dispatch($eventName, $event);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function addListener($eventName, $listener, $priority = 0)
+    {
+        throw new \BadMethodCallException('Unmodifiable event dispatchers must not be modified.');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function addSubscriber(EventSubscriberInterface $subscriber)
+    {
+        throw new \BadMethodCallException('Unmodifiable event dispatchers must not be modified.');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function removeListener($eventName, $listener)
+    {
+        throw new \BadMethodCallException('Unmodifiable event dispatchers must not be modified.');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function removeSubscriber(EventSubscriberInterface $subscriber)
+    {
+        throw new \BadMethodCallException('Unmodifiable event dispatchers must not be modified.');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getListeners($eventName = null)
+    {
+        return $this->dispatcher->getListeners($eventName);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getListenerPriority($eventName, $listener)
+    {
+        return $this->dispatcher->getListenerPriority($eventName, $listener);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function hasListeners($eventName = null)
+    {
+        return $this->dispatcher->hasListeners($eventName);
+    }
+}

vendor/symfony/event-dispatcher/LICENSE

@@ -0,0 +1,19 @@
+Copyright (c) 2004-2019 Fabien Potencier
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

vendor/symfony/event-dispatcher/README.md

@@ -0,0 +1,15 @@
+EventDispatcher Component
+=========================
+
+The EventDispatcher component provides tools that allow your application
+components to communicate with each other by dispatching events and listening to
+them.
+
+Resources
+---------
+
+  * [Documentation](https://symfony.com/doc/current/components/event_dispatcher/index.html)
+  * [Contributing](https://symfony.com/doc/current/contributing/index.html)
+  * [Report issues](https://github.com/symfony/symfony/issues) and
+    [send Pull Requests](https://github.com/symfony/symfony/pulls)
+    in the [main Symfony repository](https://github.com/symfony/symfony)