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   1  <?php
   2  /**
   3   * Server-side rendering of the `core/comments-pagination-previous` block.
   4   *
   5   * @package WordPress
   6   */
   7  
   8  /**
   9   * Renders the `core/comments-pagination-previous` block on the server.
  10   *
  11   * @since 6.0.0
  12   *
  13   * @param array    $attributes Block attributes.
  14   * @param string   $content    Block default content.
  15   * @param WP_Block $block      Block instance.
  16   *
  17   * @return string Returns the previous posts link for the comments pagination.
  18   */
  19  function render_block_core_comments_pagination_previous( $attributes, $content, $block ) {
  20      $default_label    = __( 'Older Comments' );
  21      $label            = isset( $attributes['label'] ) && ! empty( $attributes['label'] ) ? $attributes['label'] : $default_label;
  22      $pagination_arrow = get_comments_pagination_arrow( $block, 'previous' );
  23      if ( $pagination_arrow ) {
  24          $label = $pagination_arrow . $label;
  25      }
  26  
  27      $filter_link_attributes = static function () {
  28          return get_block_wrapper_attributes();
  29      };
  30      add_filter( 'previous_comments_link_attributes', $filter_link_attributes );
  31  
  32      $comment_vars           = build_comment_query_vars_from_block( $block );
  33      $previous_comments_link = get_previous_comments_link( $label, $comment_vars['paged'] ?? null );
  34  
  35      remove_filter( 'previous_comments_link_attributes', $filter_link_attributes );
  36  
  37      if ( ! isset( $previous_comments_link ) ) {
  38          return '';
  39      }
  40  
  41      return $previous_comments_link;
  42  }
  43  
  44  /**
  45   * Registers the `core/comments-pagination-previous` block on the server.
  46   *
  47   * @since 6.0.0
  48   */
  49  function register_block_core_comments_pagination_previous() {
  50      register_block_type_from_metadata(
  51          __DIR__ . '/comments-pagination-previous',
  52          array(
  53              'render_callback' => 'render_block_core_comments_pagination_previous',
  54          )
  55      );
  56  }
  57  add_action( 'init', 'register_block_core_comments_pagination_previous' );