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<?php
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declare(strict_types=1);
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namespace DI\Definition\Source;
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use DI\Definition\ObjectDefinition;
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use DI\Definition\ObjectDefinition\MethodInjection;
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use DI\Definition\Reference;
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use ReflectionNamedType;
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/**
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* Reads DI class definitions using reflection.
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*
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* @author Matthieu Napoli <matthieu@mnapoli.fr>
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*/
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class ReflectionBasedAutowiring implements DefinitionSource, Autowiring
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{
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public function autowire(string $name, ObjectDefinition $definition = null) : ObjectDefinition|null
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{
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$className = $definition ? $definition->getClassName() : $name;
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if (!class_exists($className) && !interface_exists($className)) {
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return $definition;
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}
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$definition = $definition ?: new ObjectDefinition($name);
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// Constructor
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$class = new \ReflectionClass($className);
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$constructor = $class->getConstructor();
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if ($constructor && $constructor->isPublic()) {
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$constructorInjection = MethodInjection::constructor($this->getParametersDefinition($constructor));
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$definition->completeConstructorInjection($constructorInjection);
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}
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return $definition;
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}
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public function getDefinition(string $name) : ObjectDefinition|null
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{
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return $this->autowire($name);
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}
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/**
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* Autowiring cannot guess all existing definitions.
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*/
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public function getDefinitions() : array
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{
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return [];
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}
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/**
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* Read the type-hinting from the parameters of the function.
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*/
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private function getParametersDefinition(\ReflectionFunctionAbstract $constructor) : array
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{
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$parameters = [];
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foreach ($constructor->getParameters() as $index => $parameter) {
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// Skip optional parameters
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if ($parameter->isOptional()) {
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continue;
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}
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$parameterType = $parameter->getType();
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if (!$parameterType) {
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// No type
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continue;
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}
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if (!$parameterType instanceof ReflectionNamedType) {
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// Union types are not supported
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continue;
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}
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if ($parameterType->isBuiltin()) {
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// Primitive types are not supported
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continue;
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}
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$parameters[$index] = new Reference($parameterType->getName());
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}
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return $parameters;
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}
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}
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