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<?php |
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namespace Brendt\Stitcher\Adapter; |
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use Brendt\Stitcher\Exception\ConfigurationException; |
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use Brendt\Stitcher\Exception\VariableNotFoundException; |
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use Brendt\Stitcher\Factory\AdapterFactory; |
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use Brendt\Stitcher\Site\Page; |
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/** |
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* The PaginationAdapter takes a page with a collection of entries and generates pagination for that collection. |
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* |
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* Sample configuration: |
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* |
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* /examples: |
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* template: examples/overview |
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* data: |
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* collection: collection.yml |
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* adapters: |
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* pagination: |
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* variable: collection |
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* entriesPerPage: 4 |
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*/ |
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class PaginationAdapter extends AbstractAdapter |
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{ |
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private $pageCount = null; |
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private $variable = null; |
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private $entries = []; |
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public function transformPage(Page $page, $filter = null) : array { |
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$config = $page->getAdapterConfig(AdapterFactory::PAGINATION_ADAPTER); |
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$this->variable = $config['variable'] ?? null; |
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$this->validateConfig($config, $page); |
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$pageId = rtrim($page->getId(), '/'); |
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$this->entries = (array) $this->getData($page->getVariable($this->variable)); |
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$entriesPerPage = (int) $config['entriesPerPage'] ?? 10; |
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$this->pageCount = (int) ceil(count($this->entries) / $entriesPerPage); |
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$index = 0; |
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$result = []; |
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while ($index < $this->pageCount) { |
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$pageEntries = array_splice($this->entries, 0, $entriesPerPage); |
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$pageIndex = $index + 1; |
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if ($filter === null || $pageIndex === (int) $filter) { |
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$paginatedPage = $this->createPaginatedPage($page, $pageIndex, $pageEntries); |
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$result[$paginatedPage->getId()] = $paginatedPage; |
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} |
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$index += 1; |
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} |
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$this->createMainPage($pageId, $result); |
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return $result; |
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} |
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private function createPaginatedPage(Page $page, int $pageIndex, array $pageEntries) : Page { |
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$url = "{$page->getId()}/page-{$pageIndex}"; |
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$pagination = $this->createPagination($page->getId(), $pageIndex); |
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$paginatedPage = clone $page; |
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$paginatedPage |
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->removeAdapter(AdapterFactory::PAGINATION_ADAPTER) |
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->setVariableValue($this->variable, $pageEntries) |
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->setVariableIsParsed($this->variable) |
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->setVariableValue('pagination', $pagination) |
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->setVariableIsParsed('pagination') |
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->setId($url); |
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return $paginatedPage; |
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} |
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private function createMainPage(string $pageId, array &$result) { |
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$firstPage = reset($result); |
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if (!$firstPage) { |
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return; |
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} |
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$mainPage = clone $firstPage; |
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$mainPage->setId($pageId); |
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$result[$pageId] = $mainPage; |
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} |
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private function createPagination($pageId, $pageIndex) { |
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$next = count($this->entries) ? $pageIndex + 1 : null; |
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$nextUrl = $next ? "{$pageId}/page-{$next}" : null; |
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$previous = $pageIndex > 1 ? $pageIndex - 1 : null; |
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$previousUrl = $previous ? "{$pageId}/page-{$previous}" : null; |
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return [ |
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'current' => $pageIndex, |
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'previous' => $previous ? [ |
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'url' => $previousUrl, |
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'index' => $previous, |
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] : null, |
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'next' => $next ? [ |
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'url' => $nextUrl, |
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'index' => $next, |
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] : null, |
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'pages' => $this->pageCount, |
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]; |
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} |
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private function validateConfig(array $config, Page $page) { |
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if (!isset($config['variable'])) { |
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throw new ConfigurationException('The configuration entry `variable` is required when using the Pagination adapter'); |
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} |
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if (!$page->getVariable($this->variable)) { |
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throw new VariableNotFoundException("Variable \"{$this->variable}\" was not set as a data variable for page \"{$page->getId()}\""); |
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} |
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} |
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} |
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pageon /
stitcher-core
