<?php

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/**

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

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*

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* @package WordPress

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*/

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/**

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* Determines whether a block list contains a block that uses the featured image.

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*

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* @since 6.0.0

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*

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* @param WP_Block_List $inner_blocks Inner block instance.

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*

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* @return bool Whether the block list contains a block that uses the featured image.

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*/

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function block_core_post_template_uses_featured_image( $inner_blocks ) {

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foreach ( $inner_blocks as $block ) {

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if ( 'core/post-featured-image' === $block->name ) {

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return true;

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}

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if (

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'core/cover' === $block->name &&

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! empty( $block->attributes['useFeaturedImage'] )

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) {

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return true;

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}

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if ( $block->inner_blocks && block_core_post_template_uses_featured_image( $block->inner_blocks ) ) {

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return true;

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}

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}

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return false;

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}

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/**

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* Renders the `core/post-template` block on the server.

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*

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* @since 6.3.0 Changed render_block_context priority to `1`.

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*

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* @global WP_Query $wp_query WordPress Query object.

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*

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* @param array $attributes Block attributes.

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* @param string $content Block default content.

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* @param WP_Block $block Block instance.

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*

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* @return string Returns the output of the query, structured using the layout defined by the block's inner blocks.

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*/

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function render_block_core_post_template( $attributes, $content, $block ) {

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$page_key = isset( $block->context['queryId'] ) ? 'query-' . $block->context['queryId'] . '-page' : 'query-page';

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$enhanced_pagination = isset( $block->context['enhancedPagination'] ) && $block->context['enhancedPagination'];

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$page = empty( $_GET[ $page_key ] ) ? 1 : (int) $_GET[ $page_key ];

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// Use global query if needed.

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$use_global_query = ( isset( $block->context['query']['inherit'] ) && $block->context['query']['inherit'] );

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if ( $use_global_query ) {

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global $wp_query;

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/*

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* If already in the main query loop, duplicate the query instance to not tamper with the main instance.

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* Since this is a nested query, it should start at the beginning, therefore rewind posts.

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* Otherwise, the main query loop has not started yet and this block is responsible for doing so.

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*/

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if ( in_the_loop() ) {

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$query = clone $wp_query;

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$query->rewind_posts();

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} else {

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$query = $wp_query;

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}

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} else {

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$query_args = build_query_vars_from_query_block( $block, $page );

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$query = new WP_Query( $query_args );

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}

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if ( ! $query->have_posts() ) {

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return '';

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}

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if ( block_core_post_template_uses_featured_image( $block->inner_blocks ) ) {

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update_post_thumbnail_cache( $query );

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}

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$classnames = '';

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if ( isset( $block->context['displayLayout'] ) && isset( $block->context['query'] ) ) {

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if ( isset( $block->context['displayLayout']['type'] ) && 'flex' === $block->context['displayLayout']['type'] ) {

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$classnames = "is-flex-container columns-{$block->context['displayLayout']['columns']}";

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}

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}

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if ( isset( $attributes['style']['elements']['link']['color']['text'] ) ) {

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$classnames .= ' has-link-color';

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}

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// Ensure backwards compatibility by flagging the number of columns via classname when using grid layout.

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if ( isset( $attributes['layout']['type'] ) && 'grid' === $attributes['layout']['type'] && ! empty( $attributes['layout']['columnCount'] ) ) {

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$classnames .= ' ' . sanitize_title( 'columns-' . $attributes['layout']['columnCount'] );

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}

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$wrapper_attributes = get_block_wrapper_attributes( array( 'class' => trim( $classnames ) ) );

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$content = '';

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while ( $query->have_posts() ) {

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$query->the_post();

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// Get an instance of the current Post Template block.

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$block_instance = $block->parsed_block;

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// Set the block name to one that does not correspond to an existing registered block.

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// This ensures that for the inner instances of the Post Template block, we do not render any block supports.

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$block_instance['blockName'] = 'core/null';

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$post_id = get_the_ID();

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$post_type = get_post_type();

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$filter_block_context = static function ( $context ) use ( $post_id, $post_type ) {

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$context['postType'] = $post_type;

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$context['postId'] = $post_id;

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return $context;

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};

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// Use an early priority to so that other 'render_block_context' filters have access to the values.

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add_filter( 'render_block_context', $filter_block_context, 1 );

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// Render the inner blocks of the Post Template block with `dynamic` set to `false` to prevent calling

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// `render_callback` and ensure that no wrapper markup is included.

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$block_content = ( new WP_Block( $block_instance ) )->render( array( 'dynamic' => false ) );

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remove_filter( 'render_block_context', $filter_block_context, 1 );

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// Wrap the render inner blocks in a `li` element with the appropriate post classes.

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$post_classes = implode( ' ', get_post_class( 'wp-block-post' ) );

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$inner_block_directives = $enhanced_pagination ? ' data-wp-key="post-template-item-' . $post_id . '"' : '';

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$content .= '<li' . $inner_block_directives . ' class="' . esc_attr( $post_classes ) . '">' . $block_content . '</li>';

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}

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/*

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* Use this function to restore the context of the template tags

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* from a secondary query loop back to the main query loop.

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* Since we use two custom loops, it's safest to always restore.

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*/

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wp_reset_postdata();

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return sprintf(

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'<ul %1$s>%2$s</ul>',

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$wrapper_attributes,

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$content

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);

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}

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/**

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* Registers the `core/post-template` block on the server.

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*

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* @since 5.8.0

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*/

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function register_block_core_post_template() {

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register_block_type_from_metadata(

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__DIR__ . '/post-template',

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array(

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'render_callback' => 'render_block_core_post_template',

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'skip_inner_blocks' => true,

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)

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);

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}

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add_action( 'init', 'register_block_core_post_template' );

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