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<?php |
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namespace Zenstruck\Callback; |
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/** |
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* @author Kevin Bond <[email protected]> |
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*/ |
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final class Argument |
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{ |
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/** |
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* Allow type to match exactly {@see supports()}. |
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*/ |
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public const EXACT = 2; |
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/** |
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* If type is class, parent classes are supported {@see supports()}. |
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*/ |
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public const COVARIANCE = 4; |
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/** |
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* If type is class, child classes are supported {@see supports()}. |
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*/ |
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public const CONTRAVARIANCE = 8; |
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private const TYPE_NORMALIZE_MAP = [ |
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'boolean' => 'bool', |
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'integer' => 'int', |
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'resource (closed)' => 'resource', |
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]; |
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/** @var \ReflectionParameter */ |
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private $parameter; |
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/** @var \ReflectionNamedType[] */ |
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private $types = []; |
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public function __construct(\ReflectionParameter $parameter) |
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{ |
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$this->parameter = $parameter; |
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} |
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public function type(): ?string |
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{ |
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return $this->hasType() ? \implode('|', $this->types()) : null; |
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} |
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/** |
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* @return string[] |
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*/ |
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public function types(): array |
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{ |
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return \array_map(static function(\ReflectionNamedType $type) { return $type->getName(); }, $this->reflectionTypes()); |
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} |
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public function hasType(): bool |
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{ |
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return !empty($this->types()); |
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} |
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public function isUnionType(): bool |
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{ |
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return \count($this->types()) > 1; |
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} |
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/** |
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* @param string $type The type to check if this argument supports |
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* @param int $options {@see EXACT}, {@see COVARIANCE}, {@see CONTRAVARIANCE} |
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* Bitwise disjunction of above is allowed |
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*/ |
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public function supports(string $type, int $options = self::EXACT|self::COVARIANCE): bool |
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{ |
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if (!$this->hasType()) { |
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// no type-hint so any type is supported |
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return true; |
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} |
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if ('null' === \mb_strtolower($type) && $this->parameter->allowsNull()) { |
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return true; |
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} |
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$type = self::TYPE_NORMALIZE_MAP[$type] ?? $type; |
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foreach ($this->types() as $supportedType) { |
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if ($options & self::EXACT && $supportedType === $type) { |
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return true; |
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} |
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if ($options & self::COVARIANCE && \is_a($type, $supportedType, true)) { |
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return true; |
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} |
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if ($options & self::CONTRAVARIANCE && \is_a($supportedType, $type, true)) { |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* @param mixed $value |
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*/ |
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public function allows($value): bool |
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{ |
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return $this->supports(\is_object($value) ? \get_class($value) : \gettype($value)); |
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} |
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/** |
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* @return \ReflectionNamedType[] |
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*/ |
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private function reflectionTypes(): array |
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{ |
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if (!$type = $this->parameter->getType()) { |
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return []; |
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} |
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if ($type instanceof \ReflectionNamedType) { |
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return [$type]; |
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} |
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/** @var \ReflectionUnionType $type */ |
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return $type->getTypes(); |
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} |
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} |
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zenstruck /
callback
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