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<?php
namespace Knp\Component\Pager;
use Knp\Component\Pager\Exception\PageLimitInvalidException;
use Knp\Component\Pager\Exception\PageNumberInvalidException;
use Knp\Component\Pager\Exception\PageNumberOutOfRangeException;
use Knp\Component\Pager\Pagination\PaginationInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\RequestStack;
use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
/**
* Paginator uses event dispatcher to trigger pagination
* lifecycle events. Subscribers are expected to paginate
* wanted target and finally it generates pagination view
* which is only the result of paginator
*/
final class Paginator implements PaginatorInterface
{
private EventDispatcherInterface $eventDispatcher;
/**
* Default options of paginator
*
* @var array<string, scalar>
*/
private array $defaultOptions = [
self::PAGE_PARAMETER_NAME => 'page',
self::SORT_FIELD_PARAMETER_NAME => 'sort',
self::SORT_DIRECTION_PARAMETER_NAME => 'direction',
self::FILTER_FIELD_PARAMETER_NAME => 'filterParam',
self::FILTER_VALUE_PARAMETER_NAME => 'filterValue',
self::DISTINCT => true,
self::PAGE_OUT_OF_RANGE => self::PAGE_OUT_OF_RANGE_IGNORE,
self::DEFAULT_LIMIT => self::DEFAULT_LIMIT_VALUE,
];
private ?RequestStack $requestStack;
public function __construct(EventDispatcherInterface $eventDispatcher, RequestStack $requestStack = null)
{
$this->eventDispatcher = $eventDispatcher;
$this->requestStack = $requestStack;
}
/**
* Override the default paginator options
* to be reused for paginations
*/
public function setDefaultPaginatorOptions(array $options): void
{
$this->defaultOptions = \array_merge($this->defaultOptions, $options);
}
public function paginate($target, int $page = 1, int $limit = null, array $options = []): PaginationInterface
{
if ($page <= 0) {
throw PageNumberInvalidException::create($page);
}
$limit = $limit ?? $this->defaultOptions[self::DEFAULT_LIMIT];
if ($limit <= 0) {
throw PageLimitInvalidException::create($limit);
}
$offset = ($page - 1) * $limit;
$options = \array_merge($this->defaultOptions, $options);
// normalize default sort field
if (isset($options[PaginatorInterface::DEFAULT_SORT_FIELD_NAME]) && is_array($options[PaginatorInterface::DEFAULT_SORT_FIELD_NAME])) {
$options[PaginatorInterface::DEFAULT_SORT_FIELD_NAME] = implode('+', $options[PaginatorInterface::DEFAULT_SORT_FIELD_NAME]);
}
$request = null === $this->requestStack ? Request::createFromGlobals() : $this->requestStack->getCurrentRequest();
// default sort field and direction are set based on options (if available)
if (isset($options[self::DEFAULT_SORT_FIELD_NAME]) && !$request->query->has($options[self::SORT_FIELD_PARAMETER_NAME])) {
$request->query->set($options[self::SORT_FIELD_PARAMETER_NAME], $options[self::DEFAULT_SORT_FIELD_NAME]);
if (!$request->query->has($options[PaginatorInterface::SORT_DIRECTION_PARAMETER_NAME])) {
$request->query->set($options[PaginatorInterface::SORT_DIRECTION_PARAMETER_NAME], $options[PaginatorInterface::DEFAULT_SORT_DIRECTION] ?? 'asc');
}
}
// before pagination start
$beforeEvent = new Event\BeforeEvent($this->eventDispatcher, $request);
$this->eventDispatcher->dispatch($beforeEvent, 'knp_pager.before');
// items
$itemsEvent = new Event\ItemsEvent($offset, $limit);
$itemsEvent->options = &$options;
$itemsEvent->target = &$target;
$this->eventDispatcher->dispatch($itemsEvent, 'knp_pager.items');
if (!$itemsEvent->isPropagationStopped()) {
throw new \RuntimeException('One of listeners must count and slice given target');
}
if ($page > ceil($itemsEvent->count / $limit)) {
$pageOutOfRangeOption = $options[PaginatorInterface::PAGE_OUT_OF_RANGE] ?? $this->defaultOptions[PaginatorInterface::PAGE_OUT_OF_RANGE];
if ($pageOutOfRangeOption === PaginatorInterface::PAGE_OUT_OF_RANGE_FIX && $itemsEvent->count > 0) {
// replace page number out of range with max page
return $this->paginate($target, (int) ceil($itemsEvent->count / $limit), $limit, $options);
}
if ($pageOutOfRangeOption === self::PAGE_OUT_OF_RANGE_THROW_EXCEPTION && $page > 1) {
throw new PageNumberOutOfRangeException(
sprintf('Page number: %d is out of range.', $page),
(int) ceil($itemsEvent->count / $limit)
);
}
}
// pagination initialization event
$paginationEvent = new Event\PaginationEvent;
$paginationEvent->target = &$target;
$paginationEvent->options = &$options;
$this->eventDispatcher->dispatch($paginationEvent, 'knp_pager.pagination');
if (!$paginationEvent->isPropagationStopped()) {
throw new \RuntimeException('One of listeners must create pagination view');
}
// pagination class can be different, with different rendering methods
$paginationView = $paginationEvent->getPagination();
$paginationView->setCustomParameters($itemsEvent->getCustomPaginationParameters());
$paginationView->setCurrentPageNumber($page);
$paginationView->setItemNumberPerPage($limit);
$paginationView->setTotalItemCount($itemsEvent->count);
$paginationView->setPaginatorOptions($options);
$paginationView->setItems($itemsEvent->items);
// after
$afterEvent = new Event\AfterEvent($paginationView);
$this->eventDispatcher->dispatch($afterEvent, 'knp_pager.after');
return $paginationView;
}
}

vendor/knplabs/knp-components/src/Knp/Component/Pager/Paginator.php line 56