1<?php
  2/**
  3 * Server-side rendering of the `core/query-pagination-next` block.
  4 *
  5 * @package WordPress
  6 */
  7
  8/**
  9 * Renders the `core/query-pagination-next` block on the server.
 10 *
 11 * @since 5.8.0
 12 *
 13 * @global WP_Query $wp_query WordPress Query object.
 14 *
 15 * @param array    $attributes Block attributes.
 16 * @param string   $content    Block default content.
 17 * @param WP_Block $block      Block instance.
 18 *
 19 * @return string Returns the next posts link for the query pagination.
 20 */
 21function render_block_core_query_pagination_next( $attributes, $content, $block ) {
 22	$page_key            = isset( $block->context['queryId'] ) ? 'query-' . $block->context['queryId'] . '-page' : 'query-page';
 23	$enhanced_pagination = isset( $block->context['enhancedPagination'] ) && $block->context['enhancedPagination'];
 24	$page                = empty( $_GET[ $page_key ] ) ? 1 : (int) $_GET[ $page_key ];
 25	$max_page            = isset( $block->context['query']['pages'] ) ? (int) $block->context['query']['pages'] : 0;
 26
 27	$wrapper_attributes = get_block_wrapper_attributes();
 28	$show_label         = isset( $block->context['showLabel'] ) ? (bool) $block->context['showLabel'] : true;
 29	$default_label      = __( 'Next Page' );
 30	$label_text         = isset( $attributes['label'] ) && ! empty( $attributes['label'] ) ? esc_html( $attributes['label'] ) : $default_label;
 31	$label              = $show_label ? $label_text : '';
 32	$pagination_arrow   = get_query_pagination_arrow( $block, true );
 33
 34	if ( ! $label ) {
 35		$wrapper_attributes .= ' aria-label="' . $label_text . '"';
 36	}
 37	if ( $pagination_arrow ) {
 38		$label .= $pagination_arrow;
 39	}
 40	$content = '';
 41
 42	// Check if the pagination is for Query that inherits the global context.
 43	if ( isset( $block->context['query']['inherit'] ) && $block->context['query']['inherit'] ) {
 44		$filter_link_attributes = static function () use ( $wrapper_attributes ) {
 45			return $wrapper_attributes;
 46		};
 47		add_filter( 'next_posts_link_attributes', $filter_link_attributes );
 48		// Take into account if we have set a bigger `max page`
 49		// than what the query has.
 50		global $wp_query;
 51		if ( $max_page > $wp_query->max_num_pages ) {
 52			$max_page = $wp_query->max_num_pages;
 53		}
 54		$content = get_next_posts_link( $label, $max_page );
 55		remove_filter( 'next_posts_link_attributes', $filter_link_attributes );
 56	} elseif ( ! $max_page || $max_page > $page ) {
 57		$custom_query           = new WP_Query( build_query_vars_from_query_block( $block, $page ) );
 58		$custom_query_max_pages = (int) $custom_query->max_num_pages;
 59		if ( $custom_query_max_pages && $custom_query_max_pages !== $page ) {
 60			$content = sprintf(
 61				'<a href="%1$s" %2$s>%3$s</a>',
 62				esc_url( add_query_arg( $page_key, $page + 1 ) ),
 63				$wrapper_attributes,
 64				$label
 65			);
 66		}
 67		wp_reset_postdata(); // Restore original Post Data.
 68	}
 69
 70	if ( $enhanced_pagination && isset( $content ) ) {
 71		$p = new WP_HTML_Tag_Processor( $content );
 72		if ( $p->next_tag(
 73			array(
 74				'tag_name'   => 'a',
 75				'class_name' => 'wp-block-query-pagination-next',
 76			)
 77		) ) {
 78			$p->set_attribute( 'data-wp-key', 'query-pagination-next' );
 79			$p->set_attribute( 'data-wp-on--click', 'core/query::actions.navigate' );
 80			$p->set_attribute( 'data-wp-on--mouseenter', 'core/query::actions.prefetch' );
 81			$p->set_attribute( 'data-wp-watch', 'core/query::callbacks.prefetch' );
 82			$content = $p->get_updated_html();
 83		}
 84	}
 85
 86	return $content;
 87}
 88
 89/**
 90 * Registers the `core/query-pagination-next` block on the server.
 91 *
 92 * @since 5.8.0
 93 */
 94function register_block_core_query_pagination_next() {
 95	register_block_type_from_metadata(
 96		__DIR__ . '/query-pagination-next',
 97		array(
 98			'render_callback' => 'render_block_core_query_pagination_next',
 99		)
100	);
101}
102add_action( 'init', 'register_block_core_query_pagination_next' );
103