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<?php declare(strict_types=1);
namespace Stratadox\PuzzleSolver\SearchStrategy;
use Stratadox\PuzzleSolver\Puzzle;
use function assert;
use function fwrite;
use function is_resource;
use function usleep;
/**
* Debug logger
*
* Debug logger is a visualiser for the puzzle solver. Each time a new candidate
* is taken under consideration, the debug logger logs it to the output stream.
* Decorator for other search strategies.
* @author Stratadox
*/
final class DebugLogger implements SearchStrategy
{
/** @var SearchStrategy */
private $search;
/** @var int */
private $timeout;
/** @var string */
private $separator;
/** @var resource */
private $output;
/** @var bool */
private $isFirst = true;
public function __construct(
SearchStrategy $search,
int $timeout,
string $separator,
$outputStream
) {
$this->search = $search;
$this->timeout = $timeout;
$this->separator = $separator;
assert(is_resource($outputStream));
$this->output = $outputStream;
}
public function isOngoing(): bool
return $this->search->isOngoing();
public function consider(Puzzle $puzzle): bool
return $this->search->consider($puzzle);
public function nextCandidate(): Puzzle
$puzzle = $this->search->nextCandidate();
if (!$this->isFirst) {
$this->log($this->separator);
$this->isFirst = false;
$this->log($puzzle->representation());
usleep($this->timeout);
return $puzzle;
private function log(string $entry): void
fwrite($this->output, $entry);
Stratadox /
PuzzleSolver
