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<?php |
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declare(strict_types=1); |
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namespace Yiisoft\Injector; |
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use Psr\Container\ContainerExceptionInterface; |
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use Psr\Container\ContainerInterface; |
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use Psr\Container\NotFoundExceptionInterface; |
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use ReflectionException; |
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/** |
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* Injector is able to analyze callable dependencies based on |
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* type hinting and inject them from any PSR-11 compatible container. |
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*/ |
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final class Injector |
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{ |
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private ContainerInterface $container; |
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public function __construct(ContainerInterface $container) |
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{ |
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$this->container = $container; |
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} |
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/** |
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* Invoke a callback with resolving dependencies in parameters. |
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* |
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* This methods allows invoking a callback and let type hinted parameter names to be |
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* resolved as objects of the Container. It additionally allow calling function passing named arguments. |
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* |
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* For example, the following callback may be invoked using the Container to resolve the formatter dependency: |
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* |
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* ```php |
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* $formatString = function($string, \Yiisoft\I18n\MessageFormatterInterface $formatter) { |
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* // ... |
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* } |
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* $container->invoke($formatString, ['string' => 'Hello World!']); |
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* ``` |
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* |
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* This will pass the string `'Hello World!'` as the first argument, and a formatter instance created |
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* by the DI container as the second argument. |
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* |
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* @param callable $callable callable to be invoked. |
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* @param array $arguments The array of the function arguments. |
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* This can be either a list of arguments, or an associative array where keys are argument names. |
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* @return mixed the callable return value. |
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* @throws MissingRequiredArgumentException if required argument is missing. |
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* @throws ContainerExceptionInterface if a dependency cannot be resolved or if a dependency cannot be fulfilled. |
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* @throws ReflectionException |
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*/ |
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public function invoke(callable $callable, array $arguments = []) |
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{ |
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if (\is_object($callable) && !$callable instanceof \Closure) { |
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$callable = [$callable, '__invoke']; |
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} |
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if (\is_array($callable)) { |
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$reflection = new \ReflectionMethod($callable[0], $callable[1]); |
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} else { |
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$reflection = new \ReflectionFunction($callable); |
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} |
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return \call_user_func_array($callable, $this->resolveDependencies($reflection, $arguments)); |
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} |
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/** |
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* @param string $class |
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* @param array $arguments |
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* @return mixed |
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* @throws ContainerExceptionInterface |
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* @throws MissingRequiredArgumentException|InvalidArgumentException |
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* @throws ReflectionException |
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*/ |
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public function make(string $class, array $arguments = []) |
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{ |
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$classReflection = new \ReflectionClass($class); |
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if (!$classReflection->isInstantiable()) { |
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throw new \InvalidArgumentException("Class $class is not instantiable"); |
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} |
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$reflection = $classReflection->getConstructor(); |
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if ($reflection === null) { |
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// Method __construct() does not exist |
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return new $class; |
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} |
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return new $class(...$this->resolveDependencies($reflection, $arguments)); |
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} |
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/** |
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* @param \ReflectionFunctionAbstract $reflection |
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* @param array $arguments |
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* @return array |
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* @throws ContainerExceptionInterface |
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* @throws MissingRequiredArgumentException|InvalidArgumentException |
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* @throws ReflectionException |
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*/ |
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private function resolveDependencies(\ReflectionFunctionAbstract $reflection, array $arguments = []) |
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{ |
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$resolvedArguments = []; |
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$pushUnusedArguments = true; |
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foreach ($reflection->getParameters() as $parameter) { |
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$name = $parameter->getName(); |
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$class = $parameter->getClass(); |
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$hasType = $parameter->hasType(); |
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$isNullable = $parameter->allowsNull() && $hasType; |
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$isVariadic = $parameter->isVariadic(); |
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$error = null; |
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// Get argument by name |
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if (array_key_exists($name, $arguments)) { |
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if ($isVariadic && is_array($arguments[$name])) { |
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$resolvedArguments = array_merge($resolvedArguments, array_values($arguments[$name])); |
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} else { |
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$resolvedArguments[] = $arguments[$name]; |
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} |
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unset($arguments[$name]); |
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continue; |
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} |
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if ($class !== null) { |
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// Unnamed arguments |
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$className = $class->getName(); |
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$found = false; |
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foreach ($arguments as $key => $item) { |
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if (!is_int($key)) { |
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continue; |
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} |
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if ($item instanceof $className) { |
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$found = true; |
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$resolvedArguments[] = $item; |
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unset($arguments[$key]); |
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if (!$isVariadic) { |
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break; |
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} |
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} |
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} |
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if ($found) { |
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$pushUnusedArguments = false; |
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continue; |
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} |
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// If the argument is optional we catch not instantiable exceptions |
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try { |
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$resolvedArguments[] = $this->container->get($className); |
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continue; |
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} catch (NotFoundExceptionInterface $e) { |
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$error = $e; |
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} |
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} |
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if ($parameter->isDefaultValueAvailable()) { |
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$resolvedArguments[] = $parameter->getDefaultValue(); |
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} elseif (!$parameter->isOptional()) { |
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if ($isNullable) { |
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$resolvedArguments[] = null; |
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} else { |
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throw $error ?? new MissingRequiredArgumentException($name, $reflection->getName()); |
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} |
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} elseif ($hasType) { |
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$pushUnusedArguments = false; |
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} |
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} |
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foreach ($arguments as $key => $value) { |
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if (is_int($key)) { |
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if (!is_object($value)) { |
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throw new InvalidArgumentException((string)$key, $reflection->getName()); |
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} |
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if ($pushUnusedArguments) { |
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$resolvedArguments[] = $value; |
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} |
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} |
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} |
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return $resolvedArguments; |
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} |
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} |
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yiisoft /
injector
