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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 str_starts_with; 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. */ protected function matches(mixed $other): bool { if ($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. */ protected function failureDescription(mixed $other): string { $type = gettype($other); return sprintf( '%s %s %s', str_starts_with($type, 'a') || str_starts_with($type, 'o') ? 'an' : 'a', $type, $this->toString(true), ); } }
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