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/**
 * 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 '';
	}
	$classes = &quot;post-navigation-link-$navigation_type&quot;;
	if ( isset( $attributes['textAlign'] ) ) {
		$classes .= &quot; has-text-align-{$attributes['textAlign']}&quot;;
	}
	$wrapper_attributes = get_block_wrapper_attributes( array( 'class' =&gt; $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  = '';

	// Only use hardcoded values here, otherwise we need to add escaping where these values are used.
	$arrow_map = array(
		'none'    =&gt; '',
		'arrow'   =&gt; array(
			'next'     =&gt; '→',
			'previous' =&gt; '←',
		),
		'chevron' =&gt; array(
			'next'     =&gt; '»',
			'previous' =&gt; '«',
		),
	);

	// 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'] ) &amp;&amp; ! empty( $attributes['label'] ) ) {
		$label = &quot;{$attributes['label']}&quot;;
		$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'] ) &amp;&amp; $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 = '&lt;span class=&quot;post-navigation-link__label&quot;&gt;' . wp_kses_post( $label ) . '&lt;/span&gt; %link';
			}
			$link = '%title';
		} elseif ( isset( $attributes['linkLabel'] ) &amp;&amp; $attributes['linkLabel'] ) {
			// If the label link option is enabled and there is a custom label, display it before the title.
			if ( $label ) {
				$link = '&lt;span class=&quot;post-navigation-link__label&quot;&gt;' . wp_kses_post( $label ) . '&lt;/span&gt; &lt;span class=&quot;post-navigation-link__title&quot;&gt;%title&lt;/span&gt;';
			} 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' );
				$link  = sprintf(
					'&lt;span class=&quot;post-navigation-link__label&quot;&gt;%1$s&lt;/span&gt; &lt;span class=&quot;post-navigation-link__title&quot;&gt;%2$s&lt;/span&gt;',
					wp_kses_post( $label ),
					'%title'
				);
			}
		}
	}

	// Display arrows.
	if ( isset( $attributes['arrow'] ) &amp;&amp; 'none' !== $attributes['arrow'] &amp;&amp; isset( $arrow_map[ $attributes['arrow'] ] ) ) {
		$arrow = $arrow_map[ $attributes['arrow'] ][ $navigation_type ];

		if ( 'next' === $navigation_type ) {
			$format = '%link &lt;span class=&quot;wp-block-post-navigation-link__arrow-next is-arrow-' . $attributes['arrow'] . '&quot; aria-hidden=&quot;true&quot;&gt;' . $arrow . '&lt;/span&gt;';
		} else {
			$format = '&lt;span class=&quot;wp-block-post-navigation-link__arrow-previous is-arrow-' . $attributes['arrow'] . '&quot; aria-hidden=&quot;true&quot;&gt;' . $arrow . '&lt;/span&gt; %link';
		}
	}

	// The dynamic portion of the function name, `$navigation_type`,
	// refers to the type of adjacency, 'next' or 'previous'.
	$get_link_function = &quot;get_{$navigation_type}_post_link&quot;;
	$content           = $get_link_function( $format, $link );
	return sprintf(
		'&lt;div %1$s&gt;%2$s&lt;/div&gt;',
		$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' =&gt; 'render_block_core_post_navigation_link',
		)
	);
}
add_action( 'init', 'register_block_core_post_navigation_link' );
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