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<?php |
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declare(strict_types=1); |
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namespace Gacela\Container; |
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use Gacela\Container\Exception\DependencyInvalidArgumentException; |
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use Gacela\Container\Exception\DependencyNotFoundException; |
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use ReflectionClass; |
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use ReflectionMethod; |
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use ReflectionNamedType; |
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use ReflectionParameter; |
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use function is_callable; |
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use function is_object; |
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final class DependencyResolver |
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{ |
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/** |
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* @param array<class-string,class-string|callable|object> $bindings |
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*/ |
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public function __construct( |
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private array $bindings = [], |
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) { |
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} |
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/** |
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* @param class-string $resolvedClassName |
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* |
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* @return list<mixed> |
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*/ |
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public function resolveDependencies(string $resolvedClassName): array |
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{ |
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$reflection = new ReflectionClass($resolvedClassName); |
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$constructor = $reflection->getConstructor(); |
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if (!$constructor) { |
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return []; |
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} |
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/** @var list<mixed> $dependencies */ |
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$dependencies = []; |
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foreach ($constructor->getParameters() as $parameter) { |
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/** @psalm-suppress MixedAssignment */ |
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$dependencies[] = $this->resolveDependenciesRecursively($parameter); |
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} |
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return $dependencies; |
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} |
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private function resolveDependenciesRecursively(ReflectionParameter $parameter): mixed |
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{ |
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$this->checkInvalidArgumentParam($parameter); |
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/** @var ReflectionNamedType $paramType */ |
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$paramType = $parameter->getType(); |
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/** @var class-string $paramTypeName */ |
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$paramTypeName = $paramType->getName(); |
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if ($parameter->isDefaultValueAvailable()) { |
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return $parameter->getDefaultValue(); |
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} |
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return $this->resolveClass($paramTypeName); |
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} |
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private function checkInvalidArgumentParam(ReflectionParameter $parameter): void |
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{ |
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if (!$parameter->hasType()) { |
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throw DependencyInvalidArgumentException::noParameterTypeFor($parameter->getName()); |
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} |
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/** @var ReflectionNamedType $paramType */ |
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$paramType = $parameter->getType(); |
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$paramTypeName = $paramType->getName(); |
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if ($this->isScalar($paramTypeName) && !$parameter->isDefaultValueAvailable()) { |
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/** @var ReflectionClass $reflectionClass */ |
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$reflectionClass = $parameter->getDeclaringClass(); |
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throw DependencyInvalidArgumentException::unableToResolve($paramTypeName, $reflectionClass->getName()); |
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} |
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} |
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private function isScalar(string $paramTypeName): bool |
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{ |
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return !class_exists($paramTypeName) |
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&& !interface_exists($paramTypeName); |
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} |
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/** |
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* @param class-string $paramTypeName |
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*/ |
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private function resolveClass(string $paramTypeName): mixed |
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{ |
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/** @var mixed $bindClass */ |
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$bindClass = $this->bindings[$paramTypeName] ?? null; |
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if (is_callable($bindClass)) { |
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return $bindClass(); |
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} |
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if (is_object($bindClass)) { |
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return $bindClass; |
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} |
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$reflection = $this->resolveReflectionClass($paramTypeName); |
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$constructor = $reflection->getConstructor(); |
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if ($constructor === null) { |
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return $reflection->newInstance(); |
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} |
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return $this->resolveInnerDependencies($constructor, $reflection); |
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} |
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/** |
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* @param class-string $paramTypeName |
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*/ |
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private function resolveReflectionClass(string $paramTypeName): ReflectionClass |
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{ |
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$reflection = new ReflectionClass($paramTypeName); |
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if ($reflection->isInstantiable()) { |
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return $reflection; |
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} |
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/** @var mixed $concreteClass */ |
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$concreteClass = $this->bindings[$reflection->getName()] ?? null; |
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if ($concreteClass !== null) { |
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/** @var class-string $concreteClass */ |
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return new ReflectionClass($concreteClass); |
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} |
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throw DependencyNotFoundException::mapNotFoundForClassName($reflection->getName()); |
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} |
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private function resolveInnerDependencies(ReflectionMethod $constructor, ReflectionClass $reflection): object |
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{ |
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/** @var list<mixed> $innerDependencies */ |
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$innerDependencies = []; |
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foreach ($constructor->getParameters() as $constructorParameter) { |
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$paramType = $constructorParameter->getType(); |
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if ($paramType) { |
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/** @psalm-suppress MixedAssignment */ |
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$innerDependencies[] = $this->resolveDependenciesRecursively($constructorParameter); |
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} |
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} |
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return $reflection->newInstanceArgs($innerDependencies); |
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} |
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} |
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gacela-project /
container
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