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<?php
declare(strict_types=1);
namespace CoenMooij\Sudoku\Generator;
use CoenMooij\Sudoku\Exception\UnsolvableException;
use CoenMooij\Sudoku\Puzzle\Grid;
use CoenMooij\Sudoku\Puzzle\Location;
use CoenMooij\Sudoku\Solver\BacktrackSolver;
use CoenMooij\Sudoku\Validator\GridValidator;
class SolutionGenerator
{
const NUMBER_OF_RANDOM_STARTERS = 11;
/**
* @var Grid
*/
private $grid;
* @var BacktrackSolver
private $solver;
public function __construct(BacktrackSolver $solver)
$this->solver = $solver;
}
public function generate(): Grid
do {
$this->grid = new Grid();
$this->placeRandomStarters();
} while (!$this->gridIsSolvable());
return $this->grid;
private function placeRandomStarters(): void
for ($i = 0; $i < self::NUMBER_OF_RANDOM_STARTERS; $i++) {
$location = $this->getRandomEmptyLocation();
$this->grid->set($location, random_int(1, 9));
} while (!GridValidator::gridIsValid($this->grid));
private function getRandomEmptyLocation(): Location
$location = new Location(random_int(0, 8), random_int(0, 8));
} while (!$this->grid->isEmpty($location));
return $location;
private function gridIsSolvable(): bool
gridIsSolvable()
This check looks for private methods that have been defined, but are not used inside the class.
try {
$this->solver->solve($this->grid);
return true;
} catch (UnsolvableException $exception) {
return false;
coenmooij /
sudoku
This check looks for private methods that have been defined, but are not used inside the class.