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<?php
/*
 * 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 Countable;
use Generator;
use Iterator;
use IteratorAggregate;
use Traversable;

class Count extends Constraint
{
    /**
     * @var int
     */
    protected $expectedCount = 0;

/**
     * @param int $expected
     */
    public function __construct($expected)
    {
        parent::__construct();
        $this->expectedCount = $expected;
    }

/**
     * Evaluates the constraint for parameter $other. Returns true if the
     * constraint is met, false otherwise.
     *
     * @param mixed $other
     *
     * @return bool
     */
    protected function matches($other)
    {
        return $this->expectedCount === $this->getCountOf($other);
    }

/**
     * @param \Countable|\Traversable|array $other
     *
     * @return int|null
     */
    protected function getCountOf($other)
    {
        if ($other instanceof Countable || \is_array($other)) {
            return \count($other);
        }

if ($other instanceof Traversable) {
            while ($other instanceof IteratorAggregate) {
                $other = $other->getIterator();
            }

$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;
        }
    }

/**
     * Returns the total number of iterations from a generator.
     * This will fully exhaust the generator.
     *
     * @param Generator $generator
     *
     * @return int
     */
    protected function getCountOfGenerator(Generator $generator)
    {
        for ($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 $other Evaluated value or object.
     *
     * @return string
     */
    protected function failureDescription($other)
    {
        return \sprintf(
            'actual size %d matches expected size %d',
            $this->getCountOf($other),
            $this->expectedCount
        );
    }

/**
     * @return string
     */
    public function toString()
    {
        return \sprintf(
            'count matches %d',
            $this->expectedCount
        );
    }
}

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