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<?php

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/**

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* Server-side rendering of the `core/cover` block.

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* @package WordPress

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/**

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* Renders the `core/cover` block on server.

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* @since 6.0.0

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* @param array $attributes The block attributes.

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* @param string $content The block rendered content.

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* @return string Returns the cover block markup, if useFeaturedImage is true.

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function render_block_core_cover( $attributes, $content ) {

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if ( 'image' !== $attributes['backgroundType'] || false === $attributes['useFeaturedImage'] ) {

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return $content;

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}

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if ( ! ( $attributes['hasParallax'] || $attributes['isRepeated'] ) ) {

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$attr = array(

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'class' => 'wp-block-cover__image-background',

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'data-object-fit' => 'cover',

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);

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if ( isset( $attributes['focalPoint'] ) ) {

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$object_position = round( $attributes['focalPoint']['x'] * 100 ) . '% ' . round( $attributes['focalPoint']['y'] * 100 ) . '%';

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$attr['data-object-position'] = $object_position;

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$attr['style'] = 'object-position: ' . $object_position;

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}

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$image = get_the_post_thumbnail( null, 'post-thumbnail', $attr );

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* Inserts the featured image between the (1st) cover 'background' `span` and 'inner_container' `div`,

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* and removes eventual whitespace characters between the two (typically introduced at template level)

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$inner_container_start = '/<div\b[^>]+wp-block-cover__inner-container[\s|"][^>]*>/U';

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if ( 1 === preg_match( $inner_container_start, $content, $matches, PREG_OFFSET_CAPTURE ) ) {

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$offset = $matches[0][1];

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$content = substr( $content, 0, $offset ) . $image . substr( $content, $offset );

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}

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} else {

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if ( in_the_loop() ) {

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update_post_thumbnail_cache();

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}

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$current_featured_image = get_the_post_thumbnail_url();

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if ( ! $current_featured_image ) {

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return $content;

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}

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$processor = new WP_HTML_Tag_Processor( $content );

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$processor->next_tag();

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$styles = $processor->get_attribute( 'style' );

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$merged_styles = ! empty( $styles ) ? $styles . ';' : '';

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$merged_styles .= 'background-image:url(' . esc_url( $current_featured_image ) . ');';

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$processor->set_attribute( 'style', $merged_styles );

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$content = $processor->get_updated_html();

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}

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return $content;

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}

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/**

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* Registers the `core/cover` block renderer on server.

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* @since 6.0.0

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function register_block_core_cover() {

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register_block_type_from_metadata(

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__DIR__ . '/cover',

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array(

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'render_callback' => 'render_block_core_cover',

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)

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);

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}

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add_action( 'init', 'register_block_core_cover' );

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