IterableType.php

<?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 is_iterable;
use ReflectionClass;
final class IterableType extends Type {
    private bool $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 ($other instanceof SimpleType) {
            return is_iterable($other->value());
        }
        if ($other instanceof ObjectType) {
            $className = $other->className()
                ->qualifiedName();
            assert(class_exists($className));
            return (new ReflectionClass($className))->isIterable();
        }
        return false;
    }
    public function name() : string {
        return 'iterable';
    }
    public function allowsNull() : bool {
        return $this->allowsNull;
    }
    
    /**
     * @psalm-assert-if-true IterableType $this
     */
    public function isIterable() : bool {
        return true;
    }

}