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<?php declare(strict_types=1); /* * This file is part of sebastian/type. * * (c) Sebastian Bergmann <sebastian@phpunit.de> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace SebastianBergmann\Type; use function assert; use function class_exists; use function count; use function explode; use function function_exists; use function is_array; use function is_object; use function is_string; use function str_contains; use Closure; use ReflectionClass; use ReflectionObject; /** * @no-named-arguments Parameter names are not covered by the backward compatibility promise for this library */ final class CallableType extends Type { private bool $allowsNull; public function __construct(bool $nullable) { $this->allowsNull = $nullable; } public function isAssignable(Type $other): bool { if ($this->allowsNull && $other instanceof NullType) { return true; } if ($other instanceof self) { return true; } if ($other instanceof ObjectType) { if ($this->isClosure($other)) { return true; } if ($this->hasInvokeMethod($other)) { return true; } } if ($other instanceof SimpleType) { if ($this->isFunction($other)) { return true; } if ($this->isClassCallback($other)) { return true; } if ($this->isObjectCallback($other)) { return true; } } return false; } /** * @return 'callable' */ public function name(): string { return 'callable'; } public function allowsNull(): bool { return $this->allowsNull; } public function isCallable(): bool { return true; } private function isClosure(ObjectType $type): bool { return $type->className()->qualifiedName() === Closure::class; } private function hasInvokeMethod(ObjectType $type): bool { $className = $type->className()->qualifiedName(); assert(class_exists($className)); return (new ReflectionClass($className))->hasMethod('__invoke'); } private function isFunction(SimpleType $type): bool { if (!is_string($type->value())) { return false; } return function_exists($type->value()); } private function isObjectCallback(SimpleType $type): bool { if (!is_array($type->value())) { return false; } if (count($type->value()) !== 2) { return false; } if (!isset($type->value()[0], $type->value()[1])) { return false; } if (!is_object($type->value()[0]) || !is_string($type->value()[1])) { return false; } [$object, $methodName] = $type->value(); return (new ReflectionObject($object))->hasMethod($methodName); } private function isClassCallback(SimpleType $type): bool { if (!is_string($type->value()) && !is_array($type->value())) { return false; } if (is_string($type->value())) { if (!str_contains($type->value(), '::')) { return false; } [$className, $methodName] = explode('::', $type->value()); } if (is_array($type->value())) { if (count($type->value()) !== 2) { return false; } if (!isset($type->value()[0], $type->value()[1])) { return false; } if (!is_string($type->value()[0]) || !is_string($type->value()[1])) { return false; } [$className, $methodName] = $type->value(); } if (!class_exists($className)) { return false; } $class = new ReflectionClass($className); if (!$class->hasMethod($methodName)) { return false; } $method = $class->getMethod($methodName); return $method->isPublic() && $method->isStatic(); } }
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