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<?php declare(strict_types=1);
/*
* This file is part of sebastian/type.
*
* (c) Sebastian Bergmann <[email protected]>
*
* 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 strpos;
use Closure;
use ReflectionClass;
use ReflectionException;
use ReflectionObject;
final class CallableType extends Type
{
/**
* @var bool
*/
private $allowsNull;
public function __construct(bool $nullable)
{
$this->allowsNull = $nullable;
}
/**
* @throws RuntimeException
*/
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;
}
public function name(): string
{
return 'callable';
}
public function allowsNull(): bool
{
return $this->allowsNull;
}
private function isClosure(ObjectType $type): bool
{
return !$type->className()->isNamespaced() && $type->className()->simpleName() === Closure::class;
}
/**
* @throws RuntimeException
*/
private function hasInvokeMethod(ObjectType $type): bool
{
$className = $type->className()->qualifiedName();
assert(class_exists($className));
try {
$class = new ReflectionClass($className);
// @codeCoverageIgnoreStart
} catch (ReflectionException $e) {
throw new RuntimeException(
$e->getMessage(),
(int) $e->getCode(),
$e
);
// @codeCoverageIgnoreEnd
}
if ($class->hasMethod('__invoke')) {
return true;
}
return false;
}
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($type->value()) !== 2) {
return false;
}
if (!is_object($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 (strpos($type->value(), '::') === false) {
return false;
}
[$className, $methodName] = explode('::', $type->value());
}
if (is_array($type->value())) {
if (count($type->value()) !== 2) {
return false;
}
if (!is_string($type->value()[0]) || !is_string($type->value()[1])) {
return false;
}
[$className, $methodName] = $type->value();
}
assert(isset($className) && is_string($className) && class_exists($className));
assert(isset($methodName) && is_string($methodName));
try {
$class = new ReflectionClass($className);
if ($class->hasMethod($methodName)) {
$method = $class->getMethod($methodName);
return $method->isPublic() && $method->isStatic();
}
// @codeCoverageIgnoreStart
} catch (ReflectionException $e) {
throw new RuntimeException(
$e->getMessage(),
(int) $e->getCode(),
$e
);
// @codeCoverageIgnoreEnd
}
return false;
}
}
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