1<?php
  2/**
  3 * Align block support flag.
  4 *
  5 * @package WordPress
  6 * @since 5.6.0
  7 */
  8
  9/**
 10 * Registers the align block attribute for block types that support it.
 11 *
 12 * @since 5.6.0
 13 * @access private
 14 *
 15 * @param WP_Block_Type $block_type Block Type.
 16 */
 17function wp_register_alignment_support( $block_type ) {
 18	$has_align_support = block_has_support( $block_type, 'align', false );
 19	if ( $has_align_support ) {
 20		if ( ! $block_type->attributes ) {
 21			$block_type->attributes = array();
 22		}
 23
 24		if ( ! array_key_exists( 'align', $block_type->attributes ) ) {
 25			$block_type->attributes['align'] = array(
 26				'type' => 'string',
 27				'enum' => array( 'left', 'center', 'right', 'wide', 'full', '' ),
 28			);
 29		}
 30	}
 31}
 32
 33/**
 34 * Adds CSS classes for block alignment to the incoming attributes array.
 35 * This will be applied to the block markup in the front-end.
 36 *
 37 * @since 5.6.0
 38 * @access private
 39 *
 40 * @param WP_Block_Type $block_type       Block Type.
 41 * @param array         $block_attributes Block attributes.
 42 * @return array Block alignment CSS classes and inline styles.
 43 */
 44function wp_apply_alignment_support( $block_type, $block_attributes ) {
 45	$attributes        = array();
 46	$has_align_support = block_has_support( $block_type, 'align', false );
 47	if ( $has_align_support ) {
 48		$has_block_alignment = array_key_exists( 'align', $block_attributes );
 49
 50		if ( $has_block_alignment ) {
 51			$attributes['class'] = sprintf( 'align%s', $block_attributes['align'] );
 52		}
 53	}
 54
 55	return $attributes;
 56}
 57
 58// Register the block support.
 59WP_Block_Supports::get_instance()->register(
 60	'align',
 61	array(
 62		'register_attribute' => 'wp_register_alignment_support',
 63		'apply'              => 'wp_apply_alignment_support',
 64	)
 65);
 66