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' );