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 */
22function 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 */
45function 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
54add_action( 'init', 'register_block_core_list' );
55