<?php
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declare(strict_types= 1);
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namespace Framework;
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use ReflectionClass;
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use Closure;
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use ReflectionNamedType;
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use InvalidArgumentException;
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class Container {
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private array $registry = [];
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public function set(string $name, Closure $value): void {
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$this->registry[$name] = $value;
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}
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public function get(string $class_name): object {
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if(array_key_exists($class_name, $this->registry)) {
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return $this->registry[$class_name]();
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}
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$reflector = new ReflectionClass($class_name);
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$contructor = $reflector->getConstructor();
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$dependencies = [];
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if($contructor === null) {
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return new $class_name();
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}
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foreach($contructor->getParameters() as $param) {
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$type = $param->getType();
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if($type === null) {
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throw new InvalidArgumentException("Constructor parameter '{$param->getName()}' in the $class_name class has no type declaration");
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}
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if( ! ($type instanceof ReflectionNamedType)) {
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throw new InvalidArgumentException("Constructor parameter '{$param->getName()}' in the $class_name class is an invalid type: $type
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- only single named type supported");
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}
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if($type->isBuiltin()) {
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throw new InvalidArgumentException("Unable to resolve costructor parameter '{$param->getName()}' of type '$type' in the '$class_name' class");
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}
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$dependencies[] = $this->get((string) $type);
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}
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return new $class_name(...$dependencies);
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}
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}
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