_class( $matches[0] );
	}

	return $tags->get_updated_html();
}

/**
 * Enqueues styles for block style variations.
 *
 * @since 6.6.0
 * @access private
 */
function wp_enqueue_block_style_variation_styles() {
	wp_enqueue_style( 'block-style-variation-styles' );
}

// Register the block support.
WP_Block_Supports::get_instance()->register( 'block-style-variation', array() );

add_filter( 'render_block_data', 'wp_render_block_style_variation_support_styles', 10, 2 );
add_filter( 'render_block', 'wp_render_block_style_variation_class_name', 10, 2 );
add_action( 'wp_enqueue_scripts', 'wp_enqueue_block_style_variation_styles', 1 );

/**
 * Registers block style variations read in from theme.json partials.
 *
 * @since 6.6.0
 * @access private
 *
 * @param array $variations Shared block style variations.
 */
function wp_register_block_style_variations_from_theme_json_partials( $variations ) {
	if ( empty( $variations ) ) {
		return;
	}

	$registry = WP_Block_Styles_Registry::get_instance();

	foreach ( $variations as $variation ) {
		if ( empty( $variation['blockTypes'] ) || empty( $variation['styles'] ) ) {
			continue;
		}

		$variation_name  = $variation['slug'] ?? _wp_to_kebab_case( $variation['title'] );
		$variation_label = $variation['title'] ?? $variation_name;

		foreach ( $variation['blockTypes'] as $block_type ) {
			$registered_styles = $registry->get_registered_styles_for_block( $block_type );

			// Register block style variation if it hasn't already been registered.
			if ( ! array_key_exists( $variation_name, $registered_styles ) ) {
				register_block_style(
					$block_type,
					array(
						'name'  => $variation_name,
						'label' => $variation_label,
					)
				);
			}
		}
	}
}