75 lines
2.5 KiB
PHP
75 lines
2.5 KiB
PHP
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<?php
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declare(strict_types=1);
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namespace CuyZ\Valinor\Definition;
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use Closure;
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use ReflectionClass;
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use ReflectionFunction;
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use ReflectionMethod;
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use ReflectionParameter;
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use ReflectionProperty;
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/** @internal */
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final class AttributeDefinition
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{
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/** @var callable */
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private mixed $callable;
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public function __construct(
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public readonly ClassDefinition $class,
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/** @var null|list<array<scalar>|scalar> */
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public readonly ?array $arguments,
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/** @var array{'closure'}
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* | array{'class', class-string}
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* | array{'property', class-string, string}
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* | array{'method', class-string, string}
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* | array{'methodParameter', class-string, string, int}
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* | array{'closureParameter', int}
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*/
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public readonly array $reflectionParts,
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public readonly int $attributeIndex,
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) {}
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public function forCallable(callable $callable): self
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{
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$self = clone $this;
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$self->callable = $callable;
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return $self;
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}
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/**
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* There are two ways of instantiating an attribute:
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*
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* 1. If the attribute's arguments contain only scalar, we can directly
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* instantiate the attribute using its class and arguments.
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* 2. If the attribute arguments contain any object or callable, we are
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* forced to use reflection to instantiate it, as it is not possible to
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* properly compile it.
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*
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* The first solution is by far more performant, so we prefer using it when
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* possible.
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*/
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public function instantiate(): object
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{
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if ($this->arguments !== null) {
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return new ($this->class->type->className())(...$this->arguments);
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}
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$reflection = match ($this->reflectionParts[0]) {
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'class' => new ReflectionClass($this->reflectionParts[1]),
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'property' => new ReflectionProperty($this->reflectionParts[1], $this->reflectionParts[2]),
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'method' => new ReflectionMethod($this->reflectionParts[1], $this->reflectionParts[2]),
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'methodParameter' => (new ReflectionMethod($this->reflectionParts[1], $this->reflectionParts[2]))->getParameters()[$this->reflectionParts[3]],
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'closure' => new ReflectionFunction(Closure::fromCallable($this->callable)),
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'closureParameter' => new ReflectionParameter(Closure::fromCallable($this->callable), $this->reflectionParts[1]),
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};
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return $reflection->getAttributes()[$this->attributeIndex]->newInstance();
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}
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}
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