<?php

/**

 * Align block support flag.

 *

 * @package WordPress

 * @since 5.6.0

 */

/**

 * Registers the align block attribute for block types that support it.

 *

 * @since 5.6.0

 * @access private

 *

 * @param WP_Block_Type $block_type Block Type.

 */

function wp_register_alignment_support( $block_type ) {

	$has_align_support = block_has_support( $block_type, 'align', false );

	if ( $has_align_support ) {

		if ( ! $block_type->attributes ) {

			$block_type->attributes = array();

		}

		if ( ! array_key_exists( 'align', $block_type->attributes ) ) {

			$block_type->attributes['align'] = array(

				'type' => 'string',

				'enum' => array( 'left', 'center', 'right', 'wide', 'full', '' ),

			);

		}

	}

}

/**

 * Adds CSS classes for block alignment to the incoming attributes array.

 * This will be applied to the block markup in the front-end.

 *

 * @since 5.6.0

 * @access private

 *

 * @param WP_Block_Type $block_type       Block Type.

 * @param array         $block_attributes Block attributes.

 * @return array Block alignment CSS classes and inline styles.

 */

function wp_apply_alignment_support( $block_type, $block_attributes ) {

	$attributes        = array();

	$has_align_support = block_has_support( $block_type, 'align', false );

	if ( $has_align_support ) {

		$has_block_alignment = array_key_exists( 'align', $block_attributes );

		if ( $has_block_alignment ) {

			$attributes['class'] = sprintf( 'align%s', $block_attributes['align'] );

		}

	}

	return $attributes;

}

// Register the block support.

WP_Block_Supports::get_instance()->register(

	'align',

	array(

		'register_attribute' => 'wp_register_alignment_support',

		'apply'              => 'wp_apply_alignment_support',

	)

);