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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            = ! empty( $attributes['label'] ) ? $attributes['label'] : $default_label;
  22      $pagination_arrow = get_comments_pagination_arrow( $block, 'previous' );
  23  
  24      // Escaping early as pagination arrow can return HTML that should not be escaped.
  25      $label = esc_html( $label );
  26      if ( $pagination_arrow ) {
  27          $label = $pagination_arrow . $label;
  28      }
  29  
  30      $filter_link_attributes = static function () {
  31          return get_block_wrapper_attributes();
  32      };
  33      add_filter( 'previous_comments_link_attributes', $filter_link_attributes );
  34  
  35      $comment_vars           = build_comment_query_vars_from_block( $block );
  36      $previous_comments_link = get_previous_comments_link( $label, $comment_vars['paged'] ?? null );
  37  
  38      remove_filter( 'previous_comments_link_attributes', $filter_link_attributes );
  39  
  40      if ( ! isset( $previous_comments_link ) ) {
  41          return '';
  42      }
  43  
  44      return $previous_comments_link;
  45  }
  46  
  47  /**
  48   * Registers the `core/comments-pagination-previous` block on the server.
  49   *
  50   * @since 6.0.0
  51   */
  52  function register_block_core_comments_pagination_previous() {
  53      register_block_type_from_metadata(
  54          __DIR__ . '/comments-pagination-previous',
  55          array(
  56              'render_callback' => 'render_block_core_comments_pagination_previous',
  57          )
  58      );
  59  }
  60  add_action( 'init', 'register_block_core_comments_pagination_previous' );