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<?php declare(strict_types=1);
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/*
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 * This file is part of PHPUnit.
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 *
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 * (c) Sebastian Bergmann <sebastian@phpunit.de>
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 *
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 * For the full copyright and license information, please view the LICENSE
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 * file that was distributed with this source code.
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 */
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namespace PHPUnit\Framework\Constraint;
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use function count;
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use function is_array;
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use function iterator_count;
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use function sprintf;
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use Countable;
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use EmptyIterator;
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use Generator;
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use Iterator;
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use IteratorAggregate;
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use PHPUnit\Framework\Exception;
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use Traversable;
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/**
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 * @no-named-arguments Parameter names are not covered by the backward compatibility promise for PHPUnit
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 */
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class Count extends Constraint
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{
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    /**
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     * @var int
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     */
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    private $expectedCount;
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    public function __construct(int $expected)
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    {
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        $this->expectedCount = $expected;
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    }
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    public function toString(): string
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    {
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        return sprintf(
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            'count matches %d',
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            $this->expectedCount
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        );
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    }
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    /**
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     * Evaluates the constraint for parameter $other. Returns true if the
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     * constraint is met, false otherwise.
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     *
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     * @throws Exception
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     */
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    protected function matches($other): bool
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    {
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        return $this->expectedCount === $this->getCountOf($other);
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    }
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    /**
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     * @throws Exception
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     */
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    protected function getCountOf($other): ?int
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    {
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        if ($other instanceof Countable || is_array($other)) {
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            return count($other);
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        }
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        if ($other instanceof EmptyIterator) {
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            return 0;
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        }
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        if ($other instanceof Traversable) {
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            while ($other instanceof IteratorAggregate) {
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                try {
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                    $other = $other->getIterator();
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                } catch (\Exception $e) {
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                    throw new Exception(
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                        $e->getMessage(),
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                        $e->getCode(),
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                        $e
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                    );
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                }
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            }
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            $iterator = $other;
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            if ($iterator instanceof Generator) {
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                return $this->getCountOfGenerator($iterator);
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            }
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            if (!$iterator instanceof Iterator) {
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                return iterator_count($iterator);
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            }
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            $key   = $iterator->key();
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            $count = iterator_count($iterator);
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            // Manually rewind $iterator to previous key, since iterator_count
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            // moves pointer.
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            if ($key !== null) {
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                $iterator->rewind();
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                while ($iterator->valid() && $key !== $iterator->key()) {
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                    $iterator->next();
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                }
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            }
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            return $count;
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        }
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        return null;
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    }
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    /**
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     * Returns the total number of iterations from a generator.
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     * This will fully exhaust the generator.
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     */
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    protected function getCountOfGenerator(Generator $generator): int
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    {
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        for ($count = 0; $generator->valid(); $generator->next()) {
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            $count++;
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        }
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        return $count;
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    }
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    /**
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     * Returns the description of the failure.
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     *
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     * The beginning of failure messages is "Failed asserting that" in most
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     * cases. This method should return the second part of that sentence.
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     *
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     * @param mixed $other evaluated value or object
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     */
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    protected function failureDescription($other): string
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    {
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        return sprintf(
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            'actual size %d matches expected size %d',
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            (int) $this->getCountOf($other),
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            $this->expectedCount
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        );
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    }
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}