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   1  <?php
   2  /**
   3   * Server-side rendering of the `core/query-pagination-previous` block.
   4   *
   5   * @package WordPress
   6   */
   7  
   8  /**
   9   * Renders the `core/query-pagination-previous` block on the server.
  10   *
  11   * @param array    $attributes Block attributes.
  12   * @param string   $content    Block default content.
  13   * @param WP_Block $block      Block instance.
  14   *
  15   * @return string Returns the previous posts link for the query.
  16   */
  17  function render_block_core_query_pagination_previous( $attributes, $content, $block ) {
  18      $page_key            = isset( $block->context['queryId'] ) ? 'query-' . $block->context['queryId'] . '-page' : 'query-page';
  19      $enhanced_pagination = isset( $block->context['enhancedPagination'] ) && $block->context['enhancedPagination'];
  20      $page                = empty( $_GET[ $page_key ] ) ? 1 : (int) $_GET[ $page_key ];
  21  
  22      $wrapper_attributes = get_block_wrapper_attributes();
  23      $show_label         = isset( $block->context['showLabel'] ) ? (bool) $block->context['showLabel'] : true;
  24      $default_label      = __( 'Previous Page' );
  25      $label_text         = isset( $attributes['label'] ) && ! empty( $attributes['label'] ) ? esc_html( $attributes['label'] ) : $default_label;
  26      $label              = $show_label ? $label_text : '';
  27      $pagination_arrow   = get_query_pagination_arrow( $block, false );
  28      if ( ! $label ) {
  29          $wrapper_attributes .= ' aria-label="' . $label_text . '"';
  30      }
  31      if ( $pagination_arrow ) {
  32          $label = $pagination_arrow . $label;
  33      }
  34      $content = '';
  35      // Check if the pagination is for Query that inherits the global context
  36      // and handle appropriately.
  37      if ( isset( $block->context['query']['inherit'] ) && $block->context['query']['inherit'] ) {
  38          $filter_link_attributes = static function () use ( $wrapper_attributes ) {
  39              return $wrapper_attributes;
  40          };
  41  
  42          add_filter( 'previous_posts_link_attributes', $filter_link_attributes );
  43          $content = get_previous_posts_link( $label );
  44          remove_filter( 'previous_posts_link_attributes', $filter_link_attributes );
  45      } elseif ( 1 !== $page ) {
  46          $content = sprintf(
  47              '<a href="%1$s" %2$s>%3$s</a>',
  48              esc_url( add_query_arg( $page_key, $page - 1 ) ),
  49              $wrapper_attributes,
  50              $label
  51          );
  52      }
  53  
  54      if ( $enhanced_pagination && isset( $content ) ) {
  55          $p = new WP_HTML_Tag_Processor( $content );
  56          if ( $p->next_tag(
  57              array(
  58                  'tag_name'   => 'a',
  59                  'class_name' => 'wp-block-query-pagination-previous',
  60              )
  61          ) ) {
  62              $p->set_attribute( 'data-wp-key', 'query-pagination-previous' );
  63              $p->set_attribute( 'data-wp-on--click', 'core/query::actions.navigate' );
  64              $p->set_attribute( 'data-wp-on--mouseenter', 'core/query::actions.prefetch' );
  65              $p->set_attribute( 'data-wp-watch', 'core/query::callbacks.prefetch' );
  66              $content = $p->get_updated_html();
  67          }
  68      }
  69  
  70      return $content;
  71  }
  72  
  73  /**
  74   * Registers the `core/query-pagination-previous` block on the server.
  75   */
  76  function register_block_core_query_pagination_previous() {
  77      register_block_type_from_metadata(
  78          __DIR__ . '/query-pagination-previous',
  79          array(
  80              'render_callback' => 'render_block_core_query_pagination_previous',
  81          )
  82      );
  83  }
  84  add_action( 'init', 'register_block_core_query_pagination_previous' );