--- /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\Compiler;
+
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Definition;
+use Symfony\Component\DependencyInjection\Exception\RuntimeException;
+use Symfony\Component\DependencyInjection\Reference;
+
+/**
+ * Guesses constructor arguments of services definitions and try to instantiate services if necessary.
+ *
+ * @author Kévin Dunglas <dunglas@gmail.com>
+ */
+class AutowirePass implements CompilerPassInterface
+{
+ private $container;
+ private $reflectionClasses = array();
+ private $definedTypes = array();
+ private $types;
+ private $notGuessableTypes = array();
+ private $autowired = array();
+
+ /**
+ * {@inheritdoc}
+ */
+ public function process(ContainerBuilder $container)
+ {
+ $throwingAutoloader = function ($class) { throw new \ReflectionException(sprintf('Class %s does not exist', $class)); };
+ spl_autoload_register($throwingAutoloader);
+
+ try {
+ $this->container = $container;
+ foreach ($container->getDefinitions() as $id => $definition) {
+ if ($definition->isAutowired()) {
+ $this->completeDefinition($id, $definition);
+ }
+ }
+ } catch (\Exception $e) {
+ } catch (\Throwable $e) {
+ }
+
+ spl_autoload_unregister($throwingAutoloader);
+
+ // Free memory and remove circular reference to container
+ $this->container = null;
+ $this->reflectionClasses = array();
+ $this->definedTypes = array();
+ $this->types = null;
+ $this->notGuessableTypes = array();
+ $this->autowired = array();
+
+ if (isset($e)) {
+ throw $e;
+ }
+ }
+
+ /**
+ * Wires the given definition.
+ *
+ * @param string $id
+ * @param Definition $definition
+ *
+ * @throws RuntimeException
+ */
+ private function completeDefinition($id, Definition $definition)
+ {
+ if ($definition->getFactory() || $definition->getFactoryClass(false) || $definition->getFactoryService(false)) {
+ throw new RuntimeException(sprintf('Service "%s" can use either autowiring or a factory, not both.', $id));
+ }
+
+ if (!$reflectionClass = $this->getReflectionClass($id, $definition)) {
+ return;
+ }
+
+ $this->container->addClassResource($reflectionClass);
+
+ if (!$constructor = $reflectionClass->getConstructor()) {
+ return;
+ }
+ $parameters = $constructor->getParameters();
+ if (method_exists('ReflectionMethod', 'isVariadic') && $constructor->isVariadic()) {
+ array_pop($parameters);
+ }
+
+ $arguments = $definition->getArguments();
+ foreach ($parameters as $index => $parameter) {
+ if (array_key_exists($index, $arguments) && '' !== $arguments[$index]) {
+ continue;
+ }
+
+ try {
+ if (!$typeHint = $parameter->getClass()) {
+ if (isset($arguments[$index])) {
+ continue;
+ }
+
+ // no default value? Then fail
+ if (!$parameter->isOptional()) {
+ throw new RuntimeException(sprintf('Unable to autowire argument index %d ($%s) for the service "%s". If this is an object, give it a type-hint. Otherwise, specify this argument\'s value explicitly.', $index, $parameter->name, $id));
+ }
+
+ // specifically pass the default value
+ $arguments[$index] = $parameter->getDefaultValue();
+
+ continue;
+ }
+
+ if (isset($this->autowired[$typeHint->name])) {
+ return $this->autowired[$typeHint->name] ? new Reference($this->autowired[$typeHint->name]) : null;
+ }
+
+ if (null === $this->types) {
+ $this->populateAvailableTypes();
+ }
+
+ if (isset($this->types[$typeHint->name]) && !isset($this->notGuessableTypes[$typeHint->name])) {
+ $value = new Reference($this->types[$typeHint->name]);
+ } else {
+ try {
+ $value = $this->createAutowiredDefinition($typeHint, $id);
+ } catch (RuntimeException $e) {
+ if ($parameter->isDefaultValueAvailable()) {
+ $value = $parameter->getDefaultValue();
+ } elseif ($parameter->allowsNull()) {
+ $value = null;
+ } else {
+ throw $e;
+ }
+ $this->autowired[$typeHint->name] = false;
+ }
+ }
+ } catch (\ReflectionException $e) {
+ // Typehint against a non-existing class
+
+ if (!$parameter->isDefaultValueAvailable()) {
+ throw new RuntimeException(sprintf('Cannot autowire argument %s for %s because the type-hinted class does not exist (%s).', $index + 1, $definition->getClass(), $e->getMessage()), 0, $e);
+ }
+
+ $value = $parameter->getDefaultValue();
+ }
+
+ $arguments[$index] = $value;
+ }
+
+ if ($parameters && !isset($arguments[++$index])) {
+ while (0 <= --$index) {
+ $parameter = $parameters[$index];
+ if (!$parameter->isDefaultValueAvailable() || $parameter->getDefaultValue() !== $arguments[$index]) {
+ break;
+ }
+ unset($arguments[$index]);
+ }
+ }
+
+ // it's possible index 1 was set, then index 0, then 2, etc
+ // make sure that we re-order so they're injected as expected
+ ksort($arguments);
+ $definition->setArguments($arguments);
+ }
+
+ /**
+ * Populates the list of available types.
+ */
+ private function populateAvailableTypes()
+ {
+ $this->types = array();
+
+ foreach ($this->container->getDefinitions() as $id => $definition) {
+ $this->populateAvailableType($id, $definition);
+ }
+ }
+
+ /**
+ * Populates the list of available types for a given definition.
+ *
+ * @param string $id
+ * @param Definition $definition
+ */
+ private function populateAvailableType($id, Definition $definition)
+ {
+ // Never use abstract services
+ if ($definition->isAbstract()) {
+ return;
+ }
+
+ foreach ($definition->getAutowiringTypes() as $type) {
+ $this->definedTypes[$type] = true;
+ $this->types[$type] = $id;
+ unset($this->notGuessableTypes[$type]);
+ }
+
+ if (!$reflectionClass = $this->getReflectionClass($id, $definition)) {
+ return;
+ }
+
+ foreach ($reflectionClass->getInterfaces() as $reflectionInterface) {
+ $this->set($reflectionInterface->name, $id);
+ }
+
+ do {
+ $this->set($reflectionClass->name, $id);
+ } while ($reflectionClass = $reflectionClass->getParentClass());
+ }
+
+ /**
+ * Associates a type and a service id if applicable.
+ *
+ * @param string $type
+ * @param string $id
+ */
+ private function set($type, $id)
+ {
+ if (isset($this->definedTypes[$type])) {
+ return;
+ }
+
+ if (!isset($this->types[$type])) {
+ $this->types[$type] = $id;
+
+ return;
+ }
+
+ if ($this->types[$type] === $id) {
+ return;
+ }
+
+ if (!isset($this->notGuessableTypes[$type])) {
+ $this->notGuessableTypes[$type] = true;
+ $this->types[$type] = (array) $this->types[$type];
+ }
+
+ $this->types[$type][] = $id;
+ }
+
+ /**
+ * Registers a definition for the type if possible or throws an exception.
+ *
+ * @param \ReflectionClass $typeHint
+ * @param string $id
+ *
+ * @return Reference A reference to the registered definition
+ *
+ * @throws RuntimeException
+ */
+ private function createAutowiredDefinition(\ReflectionClass $typeHint, $id)
+ {
+ if (isset($this->notGuessableTypes[$typeHint->name])) {
+ $classOrInterface = $typeHint->isInterface() ? 'interface' : 'class';
+ $matchingServices = implode(', ', $this->types[$typeHint->name]);
+
+ throw new RuntimeException(sprintf('Unable to autowire argument of type "%s" for the service "%s". Multiple services exist for this %s (%s).', $typeHint->name, $id, $classOrInterface, $matchingServices));
+ }
+
+ if (!$typeHint->isInstantiable()) {
+ $classOrInterface = $typeHint->isInterface() ? 'interface' : 'class';
+ throw new RuntimeException(sprintf('Unable to autowire argument of type "%s" for the service "%s". No services were found matching this %s and it cannot be auto-registered.', $typeHint->name, $id, $classOrInterface));
+ }
+
+ $this->autowired[$typeHint->name] = $argumentId = sprintf('autowired.%s', $typeHint->name);
+
+ $argumentDefinition = $this->container->register($argumentId, $typeHint->name);
+ $argumentDefinition->setPublic(false);
+
+ try {
+ $this->completeDefinition($argumentId, $argumentDefinition);
+ } catch (RuntimeException $e) {
+ $classOrInterface = $typeHint->isInterface() ? 'interface' : 'class';
+ $message = sprintf('Unable to autowire argument of type "%s" for the service "%s". No services were found matching this %s and it cannot be auto-registered.', $typeHint->name, $id, $classOrInterface);
+ throw new RuntimeException($message, 0, $e);
+ }
+
+ return new Reference($argumentId);
+ }
+
+ /**
+ * Retrieves the reflection class associated with the given service.
+ *
+ * @param string $id
+ * @param Definition $definition
+ *
+ * @return \ReflectionClass|false
+ */
+ private function getReflectionClass($id, Definition $definition)
+ {
+ if (isset($this->reflectionClasses[$id])) {
+ return $this->reflectionClasses[$id];
+ }
+
+ // Cannot use reflection if the class isn't set
+ if (!$class = $definition->getClass()) {
+ return false;
+ }
+
+ $class = $this->container->getParameterBag()->resolveValue($class);
+
+ try {
+ $reflector = new \ReflectionClass($class);
+ } catch (\ReflectionException $e) {
+ $reflector = false;
+ }
+
+ return $this->reflectionClasses[$id] = $reflector;
+ }
+}
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