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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 is_array;
use function iterator_count;
use function sprintf;
use Countable;
use EmptyIterator;
use Generator;
use Iterator;
use IteratorAggregate;
use PHPUnit\Framework\Exception;
use Traversable;
/**
* @no-named-arguments Parameter names are not covered by the backward compatibility promise for PHPUnit
*/
class Count extends Constraint
{
/**
* @var int
*/
private $expectedCount;
public function __construct(int $expected)
{
$this->expectedCount = $expected;
}
public function toString(): string
{
return sprintf(
'count matches %d',
$this->expectedCount
);
}
/**
* Evaluates the constraint for parameter $other. Returns true if the
* constraint is met, false otherwise.
*
* @throws Exception
*/
protected function matches($other): bool
{
return $this->expectedCount === $this->getCountOf($other);
}
/**
* @throws Exception
*/
protected function getCountOf($other): ?int
{
if ($other instanceof Countable || is_array($other)) {
return count($other);
}
if ($other instanceof EmptyIterator) {
return 0;
}
if ($other instanceof Traversable) {
while ($other instanceof IteratorAggregate) {
try {
$other = $other->getIterator();
} catch (\Exception $e) {
throw new Exception(
$e->getMessage(),
$e->getCode(),
$e
);
}
}
$iterator = $other;
if ($iterator instanceof Generator) {
return $this->getCountOfGenerator($iterator);
}
if (!$iterator instanceof Iterator) {
return iterator_count($iterator);
}
$key = $iterator->key();
$count = iterator_count($iterator);
// Manually rewind $iterator to previous key, since iterator_count
// moves pointer.
if ($key !== null) {
$iterator->rewind();
while ($iterator->valid() && $key !== $iterator->key()) {
$iterator->next();
}
}
return $count;
}
return null;
}
/**
* Returns the total number of iterations from a generator.
* This will fully exhaust the generator.
*/
protected function getCountOfGenerator(Generator $generator): int
{
for ($count = 0; $generator->valid(); $generator->next()) {
$count++;
}
return $count;
}
/**
* 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
{
return sprintf(
'actual size %d matches expected size %d',
(int) $this->getCountOf($other),
$this->expectedCount
);
}
}