<?php

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/**

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

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*

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* @package WordPress

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*/

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/**

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

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*

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* @since 5.9.0

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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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*

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* @return string Returns the next or previous post link that is adjacent to the current post.

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*/

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function render_block_core_post_navigation_link( $attributes, $content ) {

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if ( ! is_singular() ) {

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return '';

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}

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// Get the navigation type to show the proper link. Available options are `next|previous`.

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$navigation_type = isset( $attributes['type'] ) ? $attributes['type'] : 'next';

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// Allow only `next` and `previous` in `$navigation_type`.

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if ( ! in_array( $navigation_type, array( 'next', 'previous' ), true ) ) {

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return '';

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}

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$classes = "post-navigation-link-$navigation_type";

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

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$classes .= " has-text-align-{$attributes['textAlign']}";

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}

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$wrapper_attributes = get_block_wrapper_attributes(

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array(

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'class' => $classes,

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)

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);

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// Set default values.

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$format = '%link';

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$link = 'next' === $navigation_type ? _x( 'Next', 'label for next post link' ) : _x( 'Previous', 'label for previous post link' );

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$label = '';

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// Only use hardcoded values here, otherwise we need to add escaping where these values are used.

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$arrow_map = array(

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'none' => '',

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'arrow' => array(

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'next' => '→',

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'previous' => '←',

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),

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'chevron' => array(

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'next' => '»',

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'previous' => '«',

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),

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);

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// If a custom label is provided, make this a link.

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// `$label` is used to prepend the provided label, if we want to show the page title as well.

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if ( isset( $attributes['label'] ) && ! empty( $attributes['label'] ) ) {

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$label = "{$attributes['label']}";

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$link = $label;

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}

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// If we want to also show the page title, make the page title a link and prepend the label.

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if ( isset( $attributes['showTitle'] ) && $attributes['showTitle'] ) {

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/*

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* If the label link option is not enabled but there is a custom label,

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* display the custom label as text before the linked title.

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*/

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if ( ! $attributes['linkLabel'] ) {

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if ( $label ) {

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$format = '<span class="post-navigation-link__label">' . wp_kses_post( $label ) . '</span> %link';

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}

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$link = '%title';

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} elseif ( isset( $attributes['linkLabel'] ) && $attributes['linkLabel'] ) {

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// If the label link option is enabled and there is a custom label, display it before the title.

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if ( $label ) {

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$link = '<span class="post-navigation-link__label">' . wp_kses_post( $label ) . '</span> <span class="post-navigation-link__title">%title</span>';

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} else {

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/*

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* If the label link option is enabled and there is no custom label,

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* add a colon between the label and the post title.

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*/

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$label = 'next' === $navigation_type ? _x( 'Next:', 'label before the title of the next post' ) : _x( 'Previous:', 'label before the title of the previous post' );

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$link = sprintf(

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'<span class="post-navigation-link__label">%1$s</span> <span class="post-navigation-link__title">%2$s</span>',

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wp_kses_post( $label ),

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'%title'

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);

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}

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}

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}

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// Display arrows.

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if ( isset( $attributes['arrow'] ) && 'none' !== $attributes['arrow'] && isset( $arrow_map[ $attributes['arrow'] ] ) ) {

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$arrow = $arrow_map[ $attributes['arrow'] ][ $navigation_type ];

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if ( 'next' === $navigation_type ) {

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$format = '%link<span class="wp-block-post-navigation-link__arrow-next is-arrow-' . $attributes['arrow'] . '" aria-hidden="true">' . $arrow . '</span>';

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} else {

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$format = '<span class="wp-block-post-navigation-link__arrow-previous is-arrow-' . $attributes['arrow'] . '" aria-hidden="true">' . $arrow . '</span>%link';

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}

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}

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/*

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* The dynamic portion of the function name, `$navigation_type`,

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* Refers to the type of adjacency, 'next' or 'previous'.

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*

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* @see https://developer.wordpress.org/reference/functions/get_previous_post_link/

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* @see https://developer.wordpress.org/reference/functions/get_next_post_link/

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*/

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$get_link_function = "get_{$navigation_type}_post_link";

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if ( ! empty( $attributes['taxonomy'] ) ) {

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$content = $get_link_function( $format, $link, true, '', $attributes['taxonomy'] );

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} else {

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$content = $get_link_function( $format, $link );

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}

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return sprintf(

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

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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-navigation-link` block on the server.

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*

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* @since 5.9.0

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*/

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function register_block_core_post_navigation_link() {

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register_block_type_from_metadata(

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__DIR__ . '/post-navigation-link',

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array(

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'render_callback' => 'render_block_core_post_navigation_link',

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)

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);

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}

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add_action( 'init', 'register_block_core_post_navigation_link' );

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