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