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   1  <?php
   2  /**
   3   * Server-side rendering of the `core/block` block.
   4   *
   5   * @package WordPress
   6   */
   7  
   8  /**
   9   * Renders the `core/block` block on server.
  10   *
  11   * @param array $attributes The block attributes.
  12   *
  13   * @return string Rendered HTML of the referenced block.
  14   */
  15  function render_block_core_block( $attributes ) {
  16      static $seen_refs = array();
  17  
  18      if ( empty( $attributes['ref'] ) ) {
  19          return '';
  20      }
  21  
  22      $reusable_block = get_post( $attributes['ref'] );
  23      if ( ! $reusable_block || 'wp_block' !== $reusable_block->post_type ) {
  24          return '';
  25      }
  26  
  27      if ( isset( $seen_refs[ $attributes['ref'] ] ) ) {
  28          // WP_DEBUG_DISPLAY must only be honored when WP_DEBUG. This precedent
  29          // is set in `wp_debug_mode()`.
  30          $is_debug = defined( 'WP_DEBUG' ) && WP_DEBUG &&
  31              defined( 'WP_DEBUG_DISPLAY' ) && WP_DEBUG_DISPLAY;
  32  
  33          return $is_debug ?
  34              // translators: Visible only in the front end, this warning takes the place of a faulty block.
  35              __( '[block rendering halted]' ) :
  36              '';
  37      }
  38  
  39      if ( 'publish' !== $reusable_block->post_status || ! empty( $reusable_block->post_password ) ) {
  40          return '';
  41      }
  42  
  43      $seen_refs[ $attributes['ref'] ] = true;
  44  
  45      // Handle embeds for reusable blocks.
  46      global $wp_embed;
  47      $content = $wp_embed->run_shortcode( $reusable_block->post_content );
  48      $content = $wp_embed->autoembed( $content );
  49  
  50      $content = do_blocks( $content );
  51      unset( $seen_refs[ $attributes['ref'] ] );
  52      return $content;
  53  }
  54  
  55  /**
  56   * Registers the `core/block` block.
  57   */
  58  function register_block_core_block() {
  59      register_block_type_from_metadata(
  60          __DIR__ . '/block',
  61          array(
  62              'render_callback' => 'render_block_core_block',
  63          )
  64      );
  65  }
  66  add_action( 'init', 'register_block_core_block' );