393 lines
14 KiB
PHP
393 lines
14 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\DependencyInjection\Compiler;
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use Symfony\Component\DependencyInjection\Config\AutowireServiceResource;
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use Symfony\Component\DependencyInjection\ContainerBuilder;
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use Symfony\Component\DependencyInjection\Definition;
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use Symfony\Component\DependencyInjection\Exception\RuntimeException;
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use Symfony\Component\DependencyInjection\Reference;
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/**
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* Guesses constructor arguments of services definitions and try to instantiate services if necessary.
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*
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* @author Kévin Dunglas <dunglas@gmail.com>
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*/
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class AutowirePass implements CompilerPassInterface
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{
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private $container;
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private $reflectionClasses = array();
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private $definedTypes = array();
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private $types;
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private $ambiguousServiceTypes = array();
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private $autowired = array();
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/**
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* {@inheritdoc}
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*/
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public function process(ContainerBuilder $container)
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{
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$throwingAutoloader = function ($class) { throw new \ReflectionException(sprintf('Class %s does not exist', $class)); };
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spl_autoload_register($throwingAutoloader);
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try {
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$this->container = $container;
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foreach ($container->getDefinitions() as $id => $definition) {
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if ($definition->isAutowired()) {
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$this->completeDefinition($id, $definition);
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}
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}
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} finally {
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spl_autoload_unregister($throwingAutoloader);
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// Free memory and remove circular reference to container
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$this->reflectionClasses = array();
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$this->definedTypes = array();
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$this->types = null;
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$this->ambiguousServiceTypes = array();
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$this->autowired = array();
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}
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}
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/**
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* Creates a resource to help know if this service has changed.
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*
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* @param \ReflectionClass $reflectionClass
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*
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* @return AutowireServiceResource
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*/
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public static function createResourceForClass(\ReflectionClass $reflectionClass)
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{
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$metadata = array();
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if ($constructor = $reflectionClass->getConstructor()) {
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$metadata['__construct'] = self::getResourceMetadataForMethod($constructor);
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}
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foreach (self::getSetters($reflectionClass) as $reflectionMethod) {
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$metadata[$reflectionMethod->name] = self::getResourceMetadataForMethod($reflectionMethod);
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}
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return new AutowireServiceResource($reflectionClass->name, $reflectionClass->getFileName(), $metadata);
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}
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/**
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* Wires the given definition.
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*
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* @param string $id
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* @param Definition $definition
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*
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* @throws RuntimeException
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*/
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private function completeDefinition($id, Definition $definition)
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{
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if ($definition->getFactory()) {
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throw new RuntimeException(sprintf('Service "%s" can use either autowiring or a factory, not both.', $id));
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}
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if (!$reflectionClass = $this->getReflectionClass($id, $definition)) {
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return;
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}
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if ($this->container->isTrackingResources()) {
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$this->container->addResource(static::createResourceForClass($reflectionClass));
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}
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if (!$constructor = $reflectionClass->getConstructor()) {
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return;
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}
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$parameters = $constructor->getParameters();
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if (method_exists('ReflectionMethod', 'isVariadic') && $constructor->isVariadic()) {
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array_pop($parameters);
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}
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$arguments = $definition->getArguments();
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foreach ($parameters as $index => $parameter) {
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if (array_key_exists($index, $arguments) && '' !== $arguments[$index]) {
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continue;
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}
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try {
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if (!$typeHint = $parameter->getClass()) {
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if (isset($arguments[$index])) {
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continue;
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}
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// no default value? Then fail
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if (!$parameter->isOptional()) {
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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, $id));
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}
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// specifically pass the default value
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$arguments[$index] = $parameter->getDefaultValue();
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continue;
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}
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if (isset($this->autowired[$typeHint->name])) {
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$arguments[$index] = $this->autowired[$typeHint->name] ? new Reference($this->autowired[$typeHint->name]) : null;
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continue;
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}
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if (null === $this->types) {
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$this->populateAvailableTypes();
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}
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if (isset($this->types[$typeHint->name])) {
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$value = new Reference($this->types[$typeHint->name]);
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} else {
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try {
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$value = $this->createAutowiredDefinition($typeHint, $id);
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} catch (RuntimeException $e) {
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if ($parameter->isDefaultValueAvailable()) {
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$value = $parameter->getDefaultValue();
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} elseif ($parameter->allowsNull()) {
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$value = null;
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} else {
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throw $e;
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}
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$this->autowired[$typeHint->name] = false;
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}
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}
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} catch (\ReflectionException $e) {
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// Typehint against a non-existing class
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if (!$parameter->isDefaultValueAvailable()) {
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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, $e);
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}
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$value = $parameter->getDefaultValue();
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}
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$arguments[$index] = $value;
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}
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if ($parameters && !isset($arguments[++$index])) {
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while (0 <= --$index) {
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$parameter = $parameters[$index];
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if (!$parameter->isDefaultValueAvailable() || $parameter->getDefaultValue() !== $arguments[$index]) {
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break;
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}
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unset($arguments[$index]);
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}
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}
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// it's possible index 1 was set, then index 0, then 2, etc
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// make sure that we re-order so they're injected as expected
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ksort($arguments);
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$definition->setArguments($arguments);
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}
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/**
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* Populates the list of available types.
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*/
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private function populateAvailableTypes()
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{
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$this->types = array();
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foreach ($this->container->getDefinitions() as $id => $definition) {
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$this->populateAvailableType($id, $definition);
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}
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}
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/**
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* Populates the list of available types for a given definition.
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*
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* @param string $id
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* @param Definition $definition
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*/
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private function populateAvailableType($id, Definition $definition)
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{
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// Never use abstract services
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if ($definition->isAbstract()) {
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return;
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}
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foreach ($definition->getAutowiringTypes() as $type) {
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$this->definedTypes[$type] = true;
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$this->types[$type] = $id;
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unset($this->ambiguousServiceTypes[$type]);
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}
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if (!$reflectionClass = $this->getReflectionClass($id, $definition)) {
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return;
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}
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foreach ($reflectionClass->getInterfaces() as $reflectionInterface) {
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$this->set($reflectionInterface->name, $id);
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}
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do {
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$this->set($reflectionClass->name, $id);
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} while ($reflectionClass = $reflectionClass->getParentClass());
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}
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/**
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* Associates a type and a service id if applicable.
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*
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* @param string $type
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* @param string $id
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*/
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private function set($type, $id)
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{
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if (isset($this->definedTypes[$type])) {
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return;
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}
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// is this already a type/class that is known to match multiple services?
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if (isset($this->ambiguousServiceTypes[$type])) {
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$this->ambiguousServiceTypes[$type][] = $id;
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return;
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}
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// check to make sure the type doesn't match multiple services
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if (!isset($this->types[$type]) || $this->types[$type] === $id) {
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$this->types[$type] = $id;
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return;
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}
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// keep an array of all services matching this type
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if (!isset($this->ambiguousServiceTypes[$type])) {
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$this->ambiguousServiceTypes[$type] = array($this->types[$type]);
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unset($this->types[$type]);
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}
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$this->ambiguousServiceTypes[$type][] = $id;
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}
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/**
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* Registers a definition for the type if possible or throws an exception.
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*
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* @param \ReflectionClass $typeHint
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* @param string $id
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*
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* @return Reference A reference to the registered definition
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*
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* @throws RuntimeException
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*/
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private function createAutowiredDefinition(\ReflectionClass $typeHint, $id)
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{
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if (isset($this->ambiguousServiceTypes[$typeHint->name])) {
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$classOrInterface = $typeHint->isInterface() ? 'interface' : 'class';
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$matchingServices = implode(', ', $this->ambiguousServiceTypes[$typeHint->name]);
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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, $matchingServices));
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}
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if (!$typeHint->isInstantiable()) {
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$classOrInterface = $typeHint->isInterface() ? 'interface' : 'class';
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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, $classOrInterface));
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}
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$this->autowired[$typeHint->name] = $argumentId = sprintf('autowired.%s', $typeHint->name);
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$argumentDefinition = $this->container->register($argumentId, $typeHint->name);
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$argumentDefinition->setPublic(false);
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try {
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$this->completeDefinition($argumentId, $argumentDefinition);
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} catch (RuntimeException $e) {
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$classOrInterface = $typeHint->isInterface() ? 'interface' : 'class';
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$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, $classOrInterface);
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throw new RuntimeException($message, 0, $e);
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}
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return new Reference($argumentId);
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}
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/**
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* Retrieves the reflection class associated with the given service.
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*
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* @param string $id
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* @param Definition $definition
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*
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* @return \ReflectionClass|false
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*/
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private function getReflectionClass($id, Definition $definition)
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{
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if (isset($this->reflectionClasses[$id])) {
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return $this->reflectionClasses[$id];
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}
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// Cannot use reflection if the class isn't set
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if (!$class = $definition->getClass()) {
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return false;
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}
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$class = $this->container->getParameterBag()->resolveValue($class);
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if ($deprecated = $definition->isDeprecated()) {
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$prevErrorHandler = set_error_handler(function ($level, $message, $file, $line) use (&$prevErrorHandler) {
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return (E_USER_DEPRECATED === $level || !$prevErrorHandler) ? false : $prevErrorHandler($level, $message, $file, $line);
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});
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}
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$e = null;
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try {
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$reflector = new \ReflectionClass($class);
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} catch (\Exception $e) {
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} catch (\Throwable $e) {
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}
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if ($deprecated) {
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restore_error_handler();
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}
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if (null !== $e) {
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if (!$e instanceof \ReflectionException) {
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throw $e;
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}
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$reflector = false;
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}
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return $this->reflectionClasses[$id] = $reflector;
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}
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/**
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* @param \ReflectionClass $reflectionClass
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*
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* @return \ReflectionMethod[]
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*/
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private static function getSetters(\ReflectionClass $reflectionClass)
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{
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foreach ($reflectionClass->getMethods(\ReflectionMethod::IS_PUBLIC) as $reflectionMethod) {
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if (!$reflectionMethod->isStatic() && 1 === $reflectionMethod->getNumberOfParameters() && 0 === strpos($reflectionMethod->name, 'set')) {
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yield $reflectionMethod;
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}
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}
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}
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private static function getResourceMetadataForMethod(\ReflectionMethod $method)
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{
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$methodArgumentsMetadata = array();
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foreach ($method->getParameters() as $parameter) {
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try {
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$class = $parameter->getClass();
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} catch (\ReflectionException $e) {
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// type-hint is against a non-existent class
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$class = false;
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}
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$isVariadic = method_exists($parameter, 'isVariadic') && $parameter->isVariadic();
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$methodArgumentsMetadata[] = array(
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'class' => $class,
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'isOptional' => $parameter->isOptional(),
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'defaultValue' => ($parameter->isOptional() && !$isVariadic) ? $parameter->getDefaultValue() : null,
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);
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}
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return $methodArgumentsMetadata;
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}
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}
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