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<?php declare(strict_types=1);
/*
* This file is part of PHPUnit.
*
* (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 PHPUnit\Framework\Constraint;
use function count;
use function gettype;
use function sprintf;
use function strpos;
use Countable;
use EmptyIterator;
/**
* @no-named-arguments Parameter names are not covered by the backward compatibility promise for PHPUnit
*/
final class IsEmpty extends Constraint
{
/**
* Returns a string representation of the constraint.
*/
public function toString(): string
{
return 'is empty';
}
/**
* Evaluates the constraint for parameter $other. Returns true if the
* constraint is met, false otherwise.
*
* @param mixed $other value or object to evaluate
*/
protected function matches($other): bool
{
if ($other instanceof EmptyIterator) {
return true;
}
if ($other instanceof Countable) {
return count($other) === 0;
}
return empty($other);
}
/**
* Returns the description of the failure.
*
* The beginning of failure messages is "Failed asserting that" in most
* cases. This method should return the second part of that sentence.
*
* @param mixed $other evaluated value or object
*/
protected function failureDescription($other): string
{
$type = gettype($other);
return sprintf(
'%s %s %s',
strpos($type, 'a') === 0 || strpos($type, 'o') === 0 ? 'an' : 'a',
$type,
$this->toString()
);
}
}