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   1  <?php
   2  /**
   3   * Adds the wp-block-list class to the rendered list block.
   4   *
   5   * @package WordPress
   6   */
   7  
   8  /**
   9   * Adds the wp-block-list class to the rendered list block.
  10   * Ensures that pre-existing list blocks use the class name on the front.
  11   * For example, <ol> is transformed to <ol class="wp-block-list">.
  12   *
  13   * @since 6.6.0
  14   *
  15   * @see https://github.com/WordPress/gutenberg/issues/12420
  16   *
  17   * @param array  $attributes Attributes of the block being rendered.
  18   * @param string $content Content of the block being rendered.
  19   *
  20   * @return string The content of the block being rendered.
  21   */
  22  function block_core_list_render( $attributes, $content ) {
  23      if ( ! $content ) {
  24          return $content;
  25      }
  26  
  27      $processor = new WP_HTML_Tag_Processor( $content );
  28  
  29      $list_tags = array( 'OL', 'UL' );
  30      while ( $processor->next_tag() ) {
  31          if ( in_array( $processor->get_tag(), $list_tags, true ) ) {
  32              $processor->add_class( 'wp-block-list' );
  33              break;
  34          }
  35      }
  36  
  37      return $processor->get_updated_html();
  38  }
  39  
  40  /**
  41   * Registers the `core/list` block on server.
  42   *
  43   * @since 6.6.0
  44   */
  45  function register_block_core_list() {
  46      register_block_type_from_metadata(
  47          __DIR__ . '/list',
  48          array(
  49              'render_callback' => 'block_core_list_render',
  50          )
  51      );
  52  }
  53  
  54  add_action( 'init', 'register_block_core_list' );