1<?php
  2
  3/**
  4 * Server-side rendering of the `core/accordion-item` block.
  5 *
  6 * @package WordPress
  7 * @since 6.9.0
  8 *
  9 * @param array $attributes The block attributes.
 10 * @param string $content The block content.
 11 *
 12 * @return string Returns the updated markup.
 13 */
 14function block_core_accordion_item_render( $attributes, $content ) {
 15	if ( ! $content ) {
 16		return $content;
 17	}
 18
 19	$p         = new WP_HTML_Tag_Processor( $content );
 20	$unique_id = wp_unique_id( 'accordion-item-' );
 21
 22	// Initialize the state of the item on the server using a closure,
 23	// since we need to get derived state based on the current context.
 24	wp_interactivity_state(
 25		'core/accordion',
 26		array(
 27			'isOpen' => function () {
 28				$context = wp_interactivity_get_context();
 29				return $context['openByDefault'];
 30			},
 31		)
 32	);
 33
 34	if ( $p->next_tag( array( 'class_name' => 'wp-block-accordion-item' ) ) ) {
 35		$open_by_default = $attributes['openByDefault'] ? 'true' : 'false';
 36		$p->set_attribute( 'data-wp-context', '{ "id": "' . $unique_id . '", "openByDefault": ' . $open_by_default . ' }' );
 37		$p->set_attribute( 'data-wp-class--is-open', 'state.isOpen' );
 38		$p->set_attribute( 'data-wp-init', 'callbacks.initAccordionItems' );
 39		$p->set_attribute( 'data-wp-on-window--hashchange', 'callbacks.hashChange' );
 40
 41		if ( $p->next_tag( array( 'class_name' => 'wp-block-accordion-heading__toggle' ) ) ) {
 42			$p->set_attribute( 'data-wp-on--click', 'actions.toggle' );
 43			$p->set_attribute( 'data-wp-on--keydown', 'actions.handleKeyDown' );
 44			$p->set_attribute( 'id', $unique_id );
 45			$p->set_attribute( 'aria-controls', $unique_id . '-panel' );
 46			$p->set_attribute( 'data-wp-bind--aria-expanded', 'state.isOpen' );
 47
 48			if ( $p->next_tag( array( 'class_name' => 'wp-block-accordion-panel' ) ) ) {
 49				$p->set_attribute( 'id', $unique_id . '-panel' );
 50				$p->set_attribute( 'aria-labelledby', $unique_id );
 51				$p->set_attribute( 'data-wp-bind--inert', '!state.isOpen' );
 52
 53				// Only modify content if all directives have been set.
 54				$content = $p->get_updated_html();
 55			}
 56		}
 57	}
 58
 59	return $content;
 60}
 61
 62/**
 63 * Registers the `core/accordion-item` block on server.
 64 *
 65 * @since 6.9.0
 66 */
 67function register_block_core_accordion_item() {
 68	register_block_type_from_metadata(
 69		__DIR__ . '/accordion-item',
 70		array(
 71			'render_callback' => 'block_core_accordion_item_render',
 72		)
 73	);
 74}
 75add_action( 'init', 'register_block_core_accordion_item' );
 76