1<?php
  2/**
  3 * Server-side rendering of the `core/cover` block.
  4 *
  5 * @package WordPress
  6 */
  7
  8/**
  9 * Renders the `core/cover` block on server.
 10 *
 11 * @since 6.0.0
 12 *
 13 * @param array  $attributes The block attributes.
 14 * @param string $content    The block rendered content.
 15 *
 16 * @return string Returns the cover block markup, if useFeaturedImage is true.
 17 */
 18function render_block_core_cover( $attributes, $content ) {
 19	if ( 'image' !== $attributes['backgroundType'] || false === $attributes['useFeaturedImage'] ) {
 20		return $content;
 21	}
 22
 23	$object_position = isset( $attributes['focalPoint'] )
 24		? round( $attributes['focalPoint']['x'] * 100 ) . '% ' . round( $attributes['focalPoint']['y'] * 100 ) . '%'
 25		: null;
 26
 27	if ( ! ( $attributes['hasParallax'] || $attributes['isRepeated'] ) ) {
 28		$attr = array(
 29			'class'           => 'wp-block-cover__image-background',
 30			'data-object-fit' => 'cover',
 31		);
 32
 33		if ( $object_position ) {
 34			$attr['data-object-position'] = $object_position;
 35			$attr['style']                = 'object-position:' . $object_position . ';';
 36		}
 37
 38		$image = get_the_post_thumbnail( null, $attributes['sizeSlug'] ?? 'post-thumbnail', $attr );
 39	} else {
 40		if ( in_the_loop() ) {
 41			update_post_thumbnail_cache();
 42		}
 43		$current_featured_image = get_the_post_thumbnail_url( null, $attributes['sizeSlug'] ?? null );
 44		if ( ! $current_featured_image ) {
 45			return $content;
 46		}
 47
 48		$current_thumbnail_id = get_post_thumbnail_id();
 49
 50		$processor = new WP_HTML_Tag_Processor( '<div></div>' );
 51		$processor->next_tag();
 52
 53		$current_alt = trim( strip_tags( get_post_meta( $current_thumbnail_id, '_wp_attachment_image_alt', true ) ) );
 54		if ( $current_alt ) {
 55			$processor->set_attribute( 'role', 'img' );
 56			$processor->set_attribute( 'aria-label', $current_alt );
 57		}
 58
 59		$processor->add_class( 'wp-block-cover__image-background' );
 60		$processor->add_class( 'wp-image-' . $current_thumbnail_id );
 61		if ( $attributes['hasParallax'] ) {
 62			$processor->add_class( 'has-parallax' );
 63		}
 64		if ( $attributes['isRepeated'] ) {
 65			$processor->add_class( 'is-repeated' );
 66		}
 67
 68		$styles  = 'background-position:' . ( $object_position ?? '50% 50%' ) . ';';
 69		$styles .= 'background-image:url(' . esc_url( $current_featured_image ) . ');';
 70		$processor->set_attribute( 'style', $styles );
 71
 72		$image = $processor->get_updated_html();
 73	}
 74
 75	/*
 76	 * Inserts the featured image between the (1st) cover 'background' `span` and 'inner_container' `div`,
 77	 * and removes eventual whitespace characters between the two (typically introduced at template level)
 78	 */
 79	$inner_container_start = '/<div\b[^>]+wp-block-cover__inner-container[\s|"][^>]*>/U';
 80	if ( 1 === preg_match( $inner_container_start, $content, $matches, PREG_OFFSET_CAPTURE ) ) {
 81		$offset  = $matches[0][1];
 82		$content = substr( $content, 0, $offset ) . $image . substr( $content, $offset );
 83	}
 84
 85	return $content;
 86}
 87
 88/**
 89 * Registers the `core/cover` block renderer on server.
 90 *
 91 * @since 6.0.0
 92 */
 93function register_block_core_cover() {
 94	register_block_type_from_metadata(
 95		__DIR__ . '/cover',
 96		array(
 97			'render_callback' => 'render_block_core_cover',
 98		)
 99	);
100}
101add_action( 'init', 'register_block_core_cover' );
102