class AutowirePass
Inspects existing service definitions and wires the autowired ones using the type hints of their classes.
@author Kévin Dunglas <dunglas@gmail.com> @author Nicolas Grekas <p@tchwork.com>
Hierarchy
- class \Symfony\Component\DependencyInjection\Compiler\AbstractRecursivePass implements \Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface
- class \Symfony\Component\DependencyInjection\Compiler\AutowirePass extends \Symfony\Component\DependencyInjection\Compiler\AbstractRecursivePass
Expanded class hierarchy of AutowirePass
File
-
vendor/
symfony/ dependency-injection/ Compiler/ AutowirePass.php, line 36
Namespace
Symfony\Component\DependencyInjection\CompilerView source
class AutowirePass extends AbstractRecursivePass {
protected bool $skipScalars = true;
private array $types;
private array $ambiguousServiceTypes;
private array $autowiringAliases;
private ?string $lastFailure = null;
private ?string $decoratedClass = null;
private ?string $decoratedId = null;
private object $defaultArgument;
private ?\Closure $restorePreviousValue = null;
private ?self $typesClone = null;
public function __construct(bool $throwOnAutowiringException = true) {
$this->defaultArgument = new class {
public $value;
public $names;
public $bag;
public function withValue(\ReflectionParameter $parameter) : self {
$clone = clone $this;
$clone->value = $this->bag
->escapeValue($parameter->getDefaultValue());
return $clone;
}
};
}
public function process(ContainerBuilder $container) : void {
$this->defaultArgument->bag = $container->getParameterBag();
try {
$this->typesClone = clone $this;
parent::process($container);
} finally {
$this->decoratedClass = null;
$this->decoratedId = null;
$this->defaultArgument->bag = null;
$this->defaultArgument->names = null;
$this->restorePreviousValue = null;
$this->typesClone = null;
}
}
protected function processValue(mixed $value, bool $isRoot = false) : mixed {
if ($value instanceof Autowire) {
return $this->processValue($this->container
->getParameterBag()
->resolveValue($value->value));
}
if ($value instanceof AutowireDecorated) {
$definition = $this->container
->getDefinition($this->currentId);
return new Reference($definition->innerServiceId ?? $this->currentId . '.inner', $definition->decorationOnInvalid ?? ContainerInterface::NULL_ON_INVALID_REFERENCE);
}
try {
return $this->doProcessValue($value, $isRoot);
} catch (AutowiringFailedException $e) {
if ($this->throwOnAutowiringException) {
throw $e;
}
$this->container
->getDefinition($this->currentId)
->addError($e->getMessageCallback() ?? $e->getMessage());
return parent::processValue($value, $isRoot);
}
}
private function doProcessValue(mixed $value, bool $isRoot = false) : mixed {
if ($value instanceof TypedReference) {
foreach ($value->getAttributes() as $attribute) {
if ($attribute === ($v = $this->processValue($attribute))) {
continue;
}
if (!$attribute instanceof Autowire || !$v instanceof Reference) {
return $v;
}
$invalidBehavior = ContainerBuilder::EXCEPTION_ON_INVALID_REFERENCE !== $v->getInvalidBehavior() ? $v->getInvalidBehavior() : $value->getInvalidBehavior();
$value = $v instanceof TypedReference ? new TypedReference($v, $v->getType(), $invalidBehavior, $v->getName() ?? $value->getName(), array_merge($v->getAttributes(), $value->getAttributes())) : new TypedReference($v, $value->getType(), $invalidBehavior, $value->getName(), $value->getAttributes());
break;
}
if ($ref = $this->getAutowiredReference($value, true)) {
return $ref;
}
if (ContainerBuilder::RUNTIME_EXCEPTION_ON_INVALID_REFERENCE === $value->getInvalidBehavior()) {
$message = $this->createTypeNotFoundMessageCallback($value, 'it');
// since the error message varies by referenced id and $this->currentId, so should the id of the dummy errored definition
$this->container
->register($id = \sprintf('.errored.%s.%s', $this->currentId, (string) $value), $value->getType())
->addError($message);
return new TypedReference($id, $value->getType(), $value->getInvalidBehavior(), $value->getName());
}
}
$value = parent::processValue($value, $isRoot);
if (!$value instanceof Definition || !$value->isAutowired() || $value->isAbstract() || !$value->getClass()) {
return $value;
}
if (!($reflectionClass = $this->container
->getReflectionClass($value->getClass(), false))) {
$this->container
->log($this, \sprintf('Skipping service "%s": Class or interface "%s" cannot be loaded.', $this->currentId, $value->getClass()));
return $value;
}
$methodCalls = $value->getMethodCalls();
try {
$constructor = $this->getConstructor($value, false);
} catch (RuntimeException $e) {
throw new AutowiringFailedException($this->currentId, $e->getMessage(), 0, $e);
}
if ($constructor) {
array_unshift($methodCalls, [
$constructor,
$value->getArguments(),
]);
}
$checkAttributes = !$value->hasTag('container.ignore_attributes');
$methodCalls = $this->autowireCalls($methodCalls, $reflectionClass, $isRoot, $checkAttributes);
if ($constructor) {
[
,
$arguments,
] = array_shift($methodCalls);
if ($arguments !== $value->getArguments()) {
$value->setArguments($arguments);
}
}
if ($methodCalls !== $value->getMethodCalls()) {
$value->setMethodCalls($methodCalls);
}
return $value;
}
private function autowireCalls(array $methodCalls, \ReflectionClass $reflectionClass, bool $isRoot, bool $checkAttributes) : array {
if ($isRoot) {
$this->decoratedId = null;
$this->decoratedClass = null;
$this->restorePreviousValue = null;
if (($definition = $this->container
->getDefinition($this->currentId)) && null !== ($this->decoratedId = $definition->innerServiceId) && $this->container
->has($this->decoratedId)) {
$this->decoratedClass = $this->container
->findDefinition($this->decoratedId)
->getClass();
}
}
$patchedIndexes = [];
foreach ($methodCalls as $i => $call) {
[
$method,
$arguments,
] = $call;
if ($method instanceof \ReflectionFunctionAbstract) {
$reflectionMethod = $method;
}
else {
$definition = new Definition($reflectionClass->name);
try {
$reflectionMethod = $this->getReflectionMethod($definition, $method);
} catch (RuntimeException $e) {
if ($definition->getFactory()) {
continue;
}
throw $e;
}
}
$arguments = $this->autowireMethod($reflectionMethod, $arguments, $checkAttributes);
if ($arguments !== $call[1]) {
$methodCalls[$i][1] = $arguments;
$patchedIndexes[] = $i;
}
}
// use named arguments to skip complex default values
foreach ($patchedIndexes as $i) {
$namedArguments = null;
$arguments = $methodCalls[$i][1];
foreach ($arguments as $j => $value) {
if ($namedArguments && !$value instanceof $this->defaultArgument) {
unset($arguments[$j]);
$arguments[$namedArguments[$j]] = $value;
}
if (!$value instanceof $this->defaultArgument) {
continue;
}
if (\is_array($value->value) ? $value->value : \is_object($value->value)) {
unset($arguments[$j]);
$namedArguments = $value->names;
}
if ($namedArguments) {
unset($arguments[$j]);
}
else {
$arguments[$j] = $value->value;
}
}
$methodCalls[$i][1] = $arguments;
}
return $methodCalls;
}
/**
* Autowires the constructor or a method.
*
* @throws AutowiringFailedException
*/
private function autowireMethod(\ReflectionFunctionAbstract $reflectionMethod, array $arguments, bool $checkAttributes) : array {
$class = $reflectionMethod instanceof \ReflectionMethod ? $reflectionMethod->class : $this->currentId;
$method = $reflectionMethod->name;
$parameters = $reflectionMethod->getParameters();
if ($reflectionMethod->isVariadic()) {
array_pop($parameters);
}
$defaultArgument = clone $this->defaultArgument;
$defaultArgument->names = new \ArrayObject();
foreach ($parameters as $index => $parameter) {
$defaultArgument->names[$index] = $parameter->name;
if (\array_key_exists($parameter->name, $arguments)) {
$arguments[$index] = $arguments[$parameter->name];
unset($arguments[$parameter->name]);
}
if (\array_key_exists($index, $arguments) && '' !== $arguments[$index]) {
continue;
}
$type = ProxyHelper::exportType($parameter, true);
$target = null;
$name = Target::parseName($parameter, $target);
$target = $target ? [
$target,
] : [];
$currentId = $this->currentId;
$getValue = function () use ($type, $parameter, $class, $method, $name, $target, $defaultArgument, $currentId) {
if (!($value = $this->getAutowiredReference($ref = new TypedReference($type, $type, ContainerBuilder::EXCEPTION_ON_INVALID_REFERENCE, $name, $target), false))) {
$failureMessage = $this->createTypeNotFoundMessageCallback($ref, \sprintf('argument "$%s" of method "%s()"', $parameter->name, $class !== $currentId ? $class . '::' . $method : $method));
if ($parameter->isDefaultValueAvailable()) {
$value = $defaultArgument->withValue($parameter);
}
elseif (!$parameter->allowsNull()) {
throw new AutowiringFailedException($currentId, $failureMessage);
}
}
return $value;
};
if ($checkAttributes) {
$attributes = array_merge($parameter->getAttributes(Autowire::class, \ReflectionAttribute::IS_INSTANCEOF), $parameter->getAttributes(Lazy::class, \ReflectionAttribute::IS_INSTANCEOF));
if (1 < \count($attributes)) {
throw new AutowiringFailedException($this->currentId, 'Using both attributes #[Lazy] and #[Autowire] on an argument is not allowed; use the "lazy" parameter of #[Autowire] instead.');
}
foreach ($attributes as $attribute) {
$attribute = $attribute->newInstance();
$value = $attribute instanceof Autowire ? $attribute->value : null;
if (\is_string($value) && str_starts_with($value, '%env(') && str_ends_with($value, ')%')) {
if ($parameter->getType() instanceof \ReflectionNamedType && 'bool' === $parameter->getType()
->getName() && !str_starts_with($value, '%env(bool:')) {
$attribute = new Autowire(substr_replace($value, 'bool:', 5, 0));
}
if ($parameter->isDefaultValueAvailable() && $parameter->allowsNull() && null === $parameter->getDefaultValue() && !preg_match('/(^|:)default:/', $value)) {
$attribute = new Autowire(substr_replace($value, 'default::', 5, 0));
}
}
$invalidBehavior = $parameter->allowsNull() ? ContainerInterface::NULL_ON_INVALID_REFERENCE : ContainerBuilder::EXCEPTION_ON_INVALID_REFERENCE;
try {
$value = $this->processValue(new TypedReference($type ?: '?', $type ?: 'mixed', $invalidBehavior, $name, [
$attribute,
$target,
]));
} catch (ParameterNotFoundException $e) {
if (!$parameter->isDefaultValueAvailable()) {
throw new AutowiringFailedException($this->currentId, $e->getMessage(), 0, $e);
}
$arguments[$index] = clone $defaultArgument;
$arguments[$index]->value = $parameter->getDefaultValue();
continue 2;
}
if ($attribute instanceof AutowireInline) {
$value = $attribute->buildDefinition($value, $type, $parameter);
$value = $this->doProcessValue($value);
}
elseif ($lazy = $attribute->lazy) {
$definition = (new Definition($type))->setFactory('current')
->setArguments([
[
$value ??= $getValue(),
],
])
->setLazy(true);
if (!\is_array($lazy)) {
if (str_contains($type, '|')) {
throw new AutowiringFailedException($this->currentId, \sprintf('Cannot use #[Autowire] with option "lazy: true" on union types for service "%s"; set the option to the interface(s) that should be proxied instead.', $this->currentId));
}
$lazy = str_contains($type, '&') ? explode('&', $type) : [];
}
if ($lazy) {
if (!class_exists($type) && !interface_exists($type, false)) {
$definition->setClass('object');
}
foreach ($lazy as $v) {
$definition->addTag('proxy', [
'interface' => $v,
]);
}
}
if ($definition->getClass() !== (string) $value || $definition->getTag('proxy')) {
$value .= '.' . $this->container
->hash([
$definition->getClass(),
$definition->getTag('proxy'),
]);
}
$this->container
->setDefinition($value = '.lazy.' . $value, $definition);
$value = new Reference($value);
}
$arguments[$index] = $value;
continue 2;
}
foreach ($parameter->getAttributes(AutowireDecorated::class) as $attribute) {
$arguments[$index] = $this->processValue($attribute->newInstance());
continue 2;
}
}
if (!$type) {
if (isset($arguments[$index])) {
continue;
}
// no default value? Then fail
if (!$parameter->isDefaultValueAvailable()) {
// For core classes, isDefaultValueAvailable() can
// be false when isOptional() returns true. If the
// argument *is* optional, allow it to be missing
if ($parameter->isOptional()) {
--$index;
break;
}
$type = ProxyHelper::exportType($parameter);
$type = $type ? \sprintf('is type-hinted "%s"', preg_replace('/(^|[(|&])\\\\|^\\?\\\\?/', '\\1', $type)) : 'has no type-hint';
throw new AutowiringFailedException($this->currentId, \sprintf('Cannot autowire service "%s": argument "$%s" of method "%s()" %s, you should configure its value explicitly.', $this->currentId, $parameter->name, $class !== $this->currentId ? $class . '::' . $method : $method, $type));
}
// specifically pass the default value
$arguments[$index] = $defaultArgument->withValue($parameter);
continue;
}
if ($this->decoratedClass && is_a($this->decoratedClass, $type, true)) {
if ($this->restorePreviousValue) {
// The inner service is injected only if there is only 1 argument matching the type of the decorated class
// across all arguments of all autowired methods.
// If a second matching argument is found, the default behavior is restored.
($this->restorePreviousValue)();
$this->decoratedClass = $this->restorePreviousValue = null;
// Prevent further checks
}
else {
$arguments[$index] = new TypedReference($this->decoratedId, $this->decoratedClass);
$argumentAtIndex =& $arguments[$index];
$this->restorePreviousValue = static function () use (&$argumentAtIndex, $getValue) {
$argumentAtIndex = $getValue();
};
continue;
}
}
$arguments[$index] = $getValue();
}
if ($parameters && !isset($arguments[++$index])) {
while (0 <= --$index) {
if (!$arguments[$index] instanceof $defaultArgument) {
break;
}
unset($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, \SORT_NATURAL);
return $arguments;
}
/**
* Returns a reference to the service matching the given type, if any.
*/
private function getAutowiredReference(TypedReference $reference, bool $filterType) : ?TypedReference {
$this->lastFailure = null;
$type = $reference->getType();
if ($type !== (string) $reference) {
return $reference;
}
if ($filterType && false !== ($m = strpbrk($type, '&|'))) {
$types = array_diff(explode($m[0], $type), [
'int',
'string',
'array',
'bool',
'float',
'iterable',
'object',
'callable',
'null',
]);
sort($types);
$type = implode($m[0], $types);
}
$name = $target = (array_filter($reference->getAttributes(), static fn($a) => $a instanceof Target)[0] ?? null)?->name;
if (null !== ($name ??= $reference->getName())) {
if ($this->container
->has($alias = $type . ' $' . $name) && !$this->container
->findDefinition($alias)
->isAbstract()) {
return new TypedReference($alias, $type, $reference->getInvalidBehavior());
}
if (null !== ($alias = $this->getCombinedAlias($type, $name)) && !$this->container
->findDefinition($alias)
->isAbstract()) {
return new TypedReference($alias, $type, $reference->getInvalidBehavior());
}
$parsedName = (new Target($name))->getParsedName();
if ($this->container
->has($alias = $type . ' $' . $parsedName) && !$this->container
->findDefinition($alias)
->isAbstract()) {
return new TypedReference($alias, $type, $reference->getInvalidBehavior());
}
if (null !== ($alias = $this->getCombinedAlias($type, $parsedName)) && !$this->container
->findDefinition($alias)
->isAbstract()) {
return new TypedReference($alias, $type, $reference->getInvalidBehavior());
}
if ($this->container
->has($n = $name) && !$this->container
->findDefinition($n)
->isAbstract() || $this->container
->has($n = $parsedName) && !$this->container
->findDefinition($n)
->isAbstract()) {
foreach ($this->container
->getAliases() as $id => $alias) {
if ($n === (string) $alias && str_starts_with($id, $type . ' $')) {
return new TypedReference($n, $type, $reference->getInvalidBehavior());
}
}
}
if (null !== $target) {
return null;
}
}
if ($this->container
->has($type) && !$this->container
->findDefinition($type)
->isAbstract()) {
return new TypedReference($type, $type, $reference->getInvalidBehavior());
}
if (null !== ($alias = $this->getCombinedAlias($type)) && !$this->container
->findDefinition($alias)
->isAbstract()) {
return new TypedReference($alias, $type, $reference->getInvalidBehavior());
}
return null;
}
/**
* Populates the list of available types.
*/
private function populateAvailableTypes(ContainerBuilder $container) : void {
$this->types = [];
$this->ambiguousServiceTypes = [];
$this->autowiringAliases = [];
foreach ($container->getDefinitions() as $id => $definition) {
$this->populateAvailableType($container, $id, $definition);
}
$prev = null;
foreach ($container->getAliases() as $id => $alias) {
$this->populateAutowiringAlias($id, $prev);
$prev = $id;
}
}
/**
* Populates the list of available types for a given definition.
*/
private function populateAvailableType(ContainerBuilder $container, string $id, Definition $definition) : void {
// Never use abstract services
if ($definition->isAbstract()) {
return;
}
if ('' === $id || '.' === $id[0] || $definition->isDeprecated() || !($reflectionClass = $container->getReflectionClass($definition->getClass(), false))) {
return;
}
foreach ($reflectionClass->getInterfaces() as $reflectionInterface) {
$this->set($reflectionInterface->name, $id);
}
do {
$this->set($reflectionClass->name, $id);
} while ($reflectionClass = $reflectionClass->getParentClass());
$this->populateAutowiringAlias($id);
}
/**
* Associates a type and a service id if applicable.
*/
private function set(string $type, string $id) : void {
// is this already a type/class that is known to match multiple services?
if (isset($this->ambiguousServiceTypes[$type])) {
$this->ambiguousServiceTypes[$type][] = $id;
return;
}
// check to make sure the type doesn't match multiple services
if (!isset($this->types[$type]) || $this->types[$type] === $id) {
$this->types[$type] = $id;
return;
}
// keep an array of all services matching this type
if (!isset($this->ambiguousServiceTypes[$type])) {
$this->ambiguousServiceTypes[$type] = [
$this->types[$type],
];
unset($this->types[$type]);
}
$this->ambiguousServiceTypes[$type][] = $id;
}
private function createTypeNotFoundMessageCallback(TypedReference $reference, string $label) : \Closure {
if (!isset($this->typesClone->container)) {
$this->typesClone->container = new ContainerBuilder($this->container
->getParameterBag());
$this->typesClone->container
->setAliases($this->container
->getAliases());
$this->typesClone->container
->setDefinitions($this->container
->getDefinitions());
$this->typesClone->container
->setResourceTracking(false);
}
$currentId = $this->currentId;
return (fn() => $this->createTypeNotFoundMessage($reference, $label, $currentId))
->bindTo($this->typesClone);
}
private function createTypeNotFoundMessage(TypedReference $reference, string $label, string $currentId) : string {
$type = $reference->getType();
$i = null;
$namespace = $type;
do {
$namespace = substr($namespace, 0, $i);
if ($this->container
->hasDefinition($namespace) && ($tag = $this->container
->getDefinition($namespace)
->getTag('container.excluded'))) {
return \sprintf('Cannot autowire service "%s": %s needs an instance of "%s" but this type has been excluded %s.', $currentId, $label, $type, $tag[0]['source'] ?? 'from autowiring');
}
} while (false !== ($i = strrpos($namespace, '\\')));
if (!($r = $this->container
->getReflectionClass($type, false))) {
// either $type does not exist or a parent class does not exist
try {
if (class_exists(ClassExistenceResource::class)) {
$resource = new ClassExistenceResource($type, false);
// isFresh() will explode ONLY if a parent class/trait does not exist
$resource->isFresh(0);
$parentMsg = false;
}
else {
$parentMsg = "couldn't be loaded. Either it was not found or it is missing a parent class or a trait";
}
} catch (\ReflectionException $e) {
$parentMsg = \sprintf('is missing a parent class (%s)', $e->getMessage());
}
$message = \sprintf('has type "%s" but this class %s.', $type, $parentMsg ?: 'was not found');
}
else {
$alternatives = $this->createTypeAlternatives($this->container, $reference);
if (null !== ($target = array_filter($reference->getAttributes(), static fn($a) => $a instanceof Target)[0] ?? null)) {
$target = null !== $target->name ? "('{$target->name}')" : '';
$message = \sprintf('has "#[Target%s]" but no such target exists.%s', $target, $alternatives);
}
else {
$message = $this->container
->has($type) ? 'this service is abstract' : 'no such service exists';
$message = \sprintf('references %s "%s" but %s.%s', $r->isInterface() ? 'interface' : 'class', $type, $message, $alternatives);
}
if ($r->isInterface() && !$alternatives) {
$message .= ' Did you create an instantiable class that implements this interface?';
}
}
$message = \sprintf('Cannot autowire service "%s": %s %s', $currentId, $label, $message);
if (null !== $this->lastFailure) {
$message = $this->lastFailure . "\n" . $message;
$this->lastFailure = null;
}
return $message;
}
private function createTypeAlternatives(ContainerBuilder $container, TypedReference $reference) : string {
// try suggesting available aliases first
if ($message = $this->getAliasesSuggestionForType($container, $type = $reference->getType())) {
return ' ' . $message;
}
if (!isset($this->ambiguousServiceTypes)) {
$this->populateAvailableTypes($container);
}
$servicesAndAliases = $container->getServiceIds();
$autowiringAliases = $this->autowiringAliases[$type] ?? [];
unset($autowiringAliases['']);
if ($autowiringAliases) {
return \sprintf(' Did you mean to target%s "%s" instead?', 1 < \count($autowiringAliases) ? ' one of' : '', implode('", "', $autowiringAliases));
}
if (!$container->has($type) && false !== ($key = array_search(strtolower($type), array_map('strtolower', $servicesAndAliases)))) {
return \sprintf(' Did you mean "%s"?', $servicesAndAliases[$key]);
}
elseif (isset($this->ambiguousServiceTypes[$type])) {
$message = \sprintf('one of these existing services: "%s"', implode('", "', $this->ambiguousServiceTypes[$type]));
}
elseif (isset($this->types[$type])) {
$message = \sprintf('the existing "%s" service', $this->types[$type]);
}
else {
return '';
}
return \sprintf(' You should maybe alias this %s to %s.', class_exists($type, false) ? 'class' : 'interface', $message);
}
private function getAliasesSuggestionForType(ContainerBuilder $container, string $type) : ?string {
$aliases = [];
foreach (class_parents($type) + class_implements($type) as $parent) {
if ($container->has($parent) && !$container->findDefinition($parent)
->isAbstract()) {
$aliases[] = $parent;
}
}
if (1 < ($len = \count($aliases))) {
$message = 'Try changing the type-hint to one of its parents: ';
for ($i = 0, --$len; $i < $len; ++$i) {
$message .= \sprintf('%s "%s", ', class_exists($aliases[$i], false) ? 'class' : 'interface', $aliases[$i]);
}
return $message . \sprintf('or %s "%s".', class_exists($aliases[$i], false) ? 'class' : 'interface', $aliases[$i]);
}
if ($aliases) {
return \sprintf('Try changing the type-hint to "%s" instead.', $aliases[0]);
}
return null;
}
private function populateAutowiringAlias(string $id, ?string $target = null) : void {
if (!preg_match('/(?(DEFINE)(?<V>[a-zA-Z_\\x7f-\\xff][a-zA-Z0-9_\\x7f-\\xff]*+))^((?&V)(?:\\\\(?&V))*+)(?: \\$((?&V)))?$/', $id, $m)) {
return;
}
$type = $m[2];
$name = $m[3] ?? '';
if (class_exists($type, false) || interface_exists($type, false)) {
if (null !== $target && str_starts_with($target, '.' . $type . ' $') && (new Target($target = substr($target, \strlen($type) + 3)))->getParsedName() === $name) {
$name = $target;
}
$this->autowiringAliases[$type][$name] = $name;
}
}
private function getCombinedAlias(string $type, ?string $name = null) : ?string {
if (str_contains($type, '&')) {
$types = explode('&', $type);
}
elseif (str_contains($type, '|')) {
$types = explode('|', $type);
}
else {
return null;
}
$alias = null;
$suffix = $name ? ' $' . $name : '';
foreach ($types as $type) {
if (!$this->container
->hasAlias($type . $suffix)) {
return null;
}
if (null === $alias) {
$alias = (string) $this->container
->getAlias($type . $suffix);
}
elseif ((string) $this->container
->getAlias($type . $suffix) !== $alias) {
return null;
}
}
return $alias;
}
}