<?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 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;
    }

    /**
     * @psalm-assert-if-true CallableType $this
     */
    public function isCallable(): bool
    {
        return true;
    }

    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 (!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($type->value())) {
            if (strpos($type->value(), '::') === false) {
                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();
        }

        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;
    }
}

• [F] CallableType.php
  Delete
• [F] FalseType.php
  Delete
• [F] GenericObjectType.php
  Delete
• [F] IntersectionType.php
  Delete
• [F] IterableType.php
  Delete
• [F] MixedType.php
  Delete
• [F] NeverType.php
  Delete
• [F] NullType.php
  Delete
• [F] ObjectType.php
  Delete
• [F] SimpleType.php
  Delete
• [F] StaticType.php
  Delete
• [F] TrueType.php
  Delete
• [F] Type.php
  Delete
• [F] UnionType.php
  Delete
• [F] UnknownType.php
  Delete
• [F] VoidType.php
  Delete

Contact Section

Get in Touch with Us for Any Questions or Support

We’d love to hear from you! Whether you have questions, feedback, or need support, our team is here to help. Reach out to us via email, phone, or visit our office. We’re committed to providing you with exceptional service and ensuring your experience with NFC Pay is seamless and satisfying. Let’s connect!

Name*

Email*

Message*

Send Message

Our Location

20-22 Wenlock Road, England, N1 7GU

Call us on: +03601 885399

Our office hours Monday–Friday, 9am - 9pm

Email us directly

support@example.com