<?php

/**

 * Adds the wp-block-list class to the rendered list block.

 *

 * @package WordPress

 */

/**

 * Adds the wp-block-list class to the rendered list block.

 * Ensures that pre-existing list blocks use the class name on the front.

 * For example, <ol> is transformed to <ol class="wp-block-list">.

 *

 * @since 6.6.0

 *

 * @see https://github.com/WordPress/gutenberg/issues/12420

 *

 * @param array  $attributes Attributes of the block being rendered.

 * @param string $content Content of the block being rendered.

 *

 * @return string The content of the block being rendered.

 */

function block_core_list_render( $attributes, $content ) {

	if ( ! $content ) {

		return $content;

	}

	$processor = new WP_HTML_Tag_Processor( $content );

	$list_tags = array( 'OL', 'UL' );

	while ( $processor->next_tag() ) {

		if ( in_array( $processor->get_tag(), $list_tags, true ) ) {

			$processor->add_class( 'wp-block-list' );

			break;

		}

	}

	return $processor->get_updated_html();

}

/**

 * Registers the `core/list` block on server.

 *

 * @since 6.6.0

 */

function register_block_core_list() {

	register_block_type_from_metadata(

		__DIR__ . '/list',

		array(

			'render_callback' => 'block_core_list_render',

		)

	);

}

add_action( 'init', 'register_block_core_list' );