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- <?php
- /**
- * Server-side rendering of the `core/post-navigation-link` block.
- *
- * @package WordPress
- */
- /**
- * Renders the `core/post-navigation-link` block on the server.
- *
- * @param array $attributes Block attributes.
- * @param string $content Block default content.
- *
- * @return string Returns the next or previous post link that is adjacent to the current post.
- */
- function render_block_core_post_navigation_link( $attributes, $content ) {
- if ( ! is_singular() ) {
- return '';
- }
- // Get the navigation type to show the proper link. Available options are `next|previous`.
- $navigation_type = isset( $attributes['type'] ) ? $attributes['type'] : 'next';
- // Allow only `next` and `previous` in `$navigation_type`.
- if ( ! in_array( $navigation_type, array( 'next', 'previous' ), true ) ) {
- return '';
- }
- $classes = "post-navigation-link-$navigation_type";
- if ( isset( $attributes['textAlign'] ) ) {
- $classes .= " has-text-align-{$attributes['textAlign']}";
- }
- $wrapper_attributes = get_block_wrapper_attributes( array( 'class' => $classes ) );
- // Set default values.
- $format = '%link';
- $link = 'next' === $navigation_type ? _x( 'Next', 'label for next post link' ) : _x( 'Previous', 'label for previous post link' );
- $label = '';
- // If a custom label is provided, make this a link.
- // `$label` is used to prepend the provided label, if we want to show the page title as well.
- if ( isset( $attributes['label'] ) && ! empty( $attributes['label'] ) ) {
- $label = "{$attributes['label']}";
- $link = $label;
- }
- // If we want to also show the page title, make the page title a link and prepend the label.
- if ( isset( $attributes['showTitle'] ) && $attributes['showTitle'] ) {
- /*
- * If the label link option is not enabled but there is a custom label,
- * display the custom label as text before the linked title.
- */
- if ( ! $attributes['linkLabel'] ) {
- if ( $label ) {
- $format = '<span class="post-navigation-link__label">' . wp_kses_post( $label ) . '</span> %link';
- }
- $link = '%title';
- } elseif ( isset( $attributes['linkLabel'] ) && $attributes['linkLabel'] ) {
- // If the label link option is enabled and there is a custom label, display it before the title.
- if ( $label ) {
- $link = '<span class="post-navigation-link__label">' . wp_kses_post( $label ) . '</span> <span class="post-navigation-link__title">%title</span>';
- } else {
- /*
- * If the label link option is enabled and there is no custom label,
- * add a colon between the label and the post title.
- */
- $label = 'next' === $navigation_type ? _x( 'Next:', 'label before the title of the next post' ) : _x( 'Previous:', 'label before the title of the previous post' );
- $link = sprintf(
- '<span class="post-navigation-link__label">%1$s</span> <span class="post-navigation-link__title">%2$s</span>',
- wp_kses_post( $label ),
- '%title'
- );
- }
- }
- }
- // The dynamic portion of the function name, `$navigation_type`,
- // refers to the type of adjacency, 'next' or 'previous'.
- $get_link_function = "get_{$navigation_type}_post_link";
- $content = $get_link_function( $format, $link );
- return sprintf(
- '<div %1$s>%2$s</div>',
- $wrapper_attributes,
- $content
- );
- }
- /**
- * Registers the `core/post-navigation-link` block on the server.
- */
- function register_block_core_post_navigation_link() {
- register_block_type_from_metadata(
- __DIR__ . '/post-navigation-link',
- array(
- 'render_callback' => 'render_block_core_post_navigation_link',
- )
- );
- }
- add_action( 'init', 'register_block_core_post_navigation_link' );
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