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EDIT: post-navigation-link.php

<?php
/**
 * Server-side rendering of the `core/post-navigation-link` block.
 *
 * @package WordPress
 */

/**
 * Renders the `core/post-navigation-link` block on the server.
 *
 * @since 5.9.0
 *
 * @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  = '';

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

// 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 = '' . wp_kses_post( $label ) . ' %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 = '' . wp_kses_post( $label ) . ' %title';
			} 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' );
				$link = sprintf(
					'%1$s %2$s',
					wp_kses_post( $label ),
					'%title'
				);
			}
		}
	}

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

if ( 'next' === $navigation_type ) {
			$format = '%link' . $arrow . '';
		} else {
			$format = '' . $arrow . '%link';
		}
	}

/*
	 * The dynamic portion of the function name, `$navigation_type`,
	 * Refers to the type of adjacency, 'next' or 'previous'.
	 *
	 * @see https://developer.wordpress.org/reference/functions/get_previous_post_link/
	 * @see https://developer.wordpress.org/reference/functions/get_next_post_link/
	 */
	$get_link_function = "get_{$navigation_type}_post_link";

if ( ! empty( $attributes['taxonomy'] ) ) {
		$content = $get_link_function( $format, $link, true, '', $attributes['taxonomy'] );
	} else {
		$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.
 *
 * @since 5.9.0
 */
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' );

NAME	SIZE	ACTIONS
📁 accordion		[ DEL ]
📁 accordion-heading		[ DEL ]
📁 accordion-item		[ DEL ]
📁 accordion-panel		[ DEL ]
📁 archives		[ DEL ]
📁 audio		[ DEL ]
📁 avatar		[ DEL ]
📁 block		[ DEL ]
📁 button		[ DEL ]
📁 buttons		[ DEL ]
📁 calendar		[ DEL ]
📁 categories		[ DEL ]
📁 code		[ DEL ]
📁 column		[ DEL ]
📁 columns		[ DEL ]
📁 comment-author-name		[ DEL ]
📁 comment-content		[ DEL ]
📁 comment-date		[ DEL ]
📁 comment-edit-link		[ DEL ]
📁 comment-reply-link		[ DEL ]
📁 comment-template		[ DEL ]
📁 comments		[ DEL ]
📁 comments-pagination		[ DEL ]
📁 comments-pagination-next		[ DEL ]
📁 comments-pagination-numbers		[ DEL ]
📁 comments-pagination-previous		[ DEL ]
📁 comments-title		[ DEL ]
📁 cover		[ DEL ]
📁 details		[ DEL ]
📁 embed		[ DEL ]
📁 file		[ DEL ]
📁 footnotes		[ DEL ]
📁 freeform		[ DEL ]
📁 gallery		[ DEL ]
📁 group		[ DEL ]
📁 heading		[ DEL ]
📁 home-link		[ DEL ]
📁 html		[ DEL ]
📁 image		[ DEL ]
📁 latest-comments		[ DEL ]
📁 latest-posts		[ DEL ]
📁 legacy-widget		[ DEL ]
📁 list		[ DEL ]
📁 list-item		[ DEL ]
📁 loginout		[ DEL ]
📁 math		[ DEL ]
📁 media-text		[ DEL ]
📁 missing		[ DEL ]
📁 more		[ DEL ]
📁 navigation		[ DEL ]
📁 navigation-link		[ DEL ]
📁 navigation-submenu		[ DEL ]
📁 nextpage		[ DEL ]
📁 page-list		[ DEL ]
📁 page-list-item		[ DEL ]
📁 paragraph		[ DEL ]
📁 pattern		[ DEL ]
📁 post-author		[ DEL ]
📁 post-author-biography		[ DEL ]
📁 post-author-name		[ DEL ]
📁 post-comments-count		[ DEL ]
📁 post-comments-form		[ DEL ]
📁 post-comments-link		[ DEL ]
📁 post-content		[ DEL ]
📁 post-date		[ DEL ]
📁 post-excerpt		[ DEL ]
📁 post-featured-image		[ DEL ]
📁 post-navigation-link		[ DEL ]
📁 post-template		[ DEL ]
📁 post-terms		[ DEL ]
📁 post-time-to-read		[ DEL ]
📁 post-title		[ DEL ]
📁 preformatted		[ DEL ]
📁 pullquote		[ DEL ]
📁 query		[ DEL ]
📁 query-no-results		[ DEL ]
📁 query-pagination		[ DEL ]
📁 query-pagination-next		[ DEL ]
📁 query-pagination-numbers		[ DEL ]
📁 query-pagination-previous		[ DEL ]
📁 query-title		[ DEL ]
📁 query-total		[ DEL ]
📁 quote		[ DEL ]
📁 read-more		[ DEL ]
📁 rss		[ DEL ]
📁 search		[ DEL ]
📁 separator		[ DEL ]
📁 shortcode		[ DEL ]
📁 site-logo		[ DEL ]
📁 site-tagline		[ DEL ]
📁 site-title		[ DEL ]
📁 social-link		[ DEL ]
📁 social-links		[ DEL ]
📁 spacer		[ DEL ]
📁 table		[ DEL ]
📁 tag-cloud		[ DEL ]
📁 template-part		[ DEL ]
📁 term-count		[ DEL ]
📁 term-description		[ DEL ]
📁 term-name		[ DEL ]
📁 term-template		[ DEL ]
📁 terms-query		[ DEL ]
📁 text-columns		[ DEL ]
📁 verse		[ DEL ]
📁 video		[ DEL ]
📁 widget-group		[ DEL ]
📄 accordion-item.php	2,411 B	[ EDIT ] \| [ DEL ]
📄 accordion.php	1,147 B	[ EDIT ] \| [ DEL ]
📄 archives.php	4,415 B	[ EDIT ] \| [ DEL ]
📄 avatar.php	5,745 B	[ EDIT ] \| [ DEL ]
📄 block.php	4,186 B	[ EDIT ] \| [ DEL ]
📄 blocks-json.php	218,553 B	[ EDIT ] \| [ DEL ]
📄 button.php	1,752 B	[ EDIT ] \| [ DEL ]
📄 calendar.php	6,075 B	[ EDIT ] \| [ DEL ]
📄 categories.php	4,650 B	[ EDIT ] \| [ DEL ]
📄 comment-author-name.php	2,133 B	[ EDIT ] \| [ DEL ]
📄 comment-content.php	2,459 B	[ EDIT ] \| [ DEL ]
📄 comment-date.php	1,863 B	[ EDIT ] \| [ DEL ]
📄 comment-edit-link.php	1,713 B	[ EDIT ] \| [ DEL ]
📄 comment-reply-link.php	2,075 B	[ EDIT ] \| [ DEL ]
📄 comment-template.php	4,494 B	[ EDIT ] \| [ DEL ]
📄 comments-pagination-next.php	1,924 B	[ EDIT ] \| [ DEL ]
📄 comments-pagination-numbers.php	1,632 B	[ EDIT ] \| [ DEL ]
📄 comments-pagination-previous.php	1,790 B	[ EDIT ] \| [ DEL ]
📄 comments-pagination.php	1,261 B	[ EDIT ] \| [ DEL ]
📄 comments-title.php	2,772 B	[ EDIT ] \| [ DEL ]
📄 comments.php	6,784 B	[ EDIT ] \| [ DEL ]
📄 cover.php	3,175 B	[ EDIT ] \| [ DEL ]
📄 file.php	1,879 B	[ EDIT ] \| [ DEL ]
📄 footnotes.php	3,771 B	[ EDIT ] \| [ DEL ]
📄 gallery.php	6,439 B	[ EDIT ] \| [ DEL ]
📄 heading.php	1,301 B	[ EDIT ] \| [ DEL ]
📄 home-link.php	5,438 B	[ EDIT ] \| [ DEL ]
📄 image.php	13,824 B	[ EDIT ] \| [ DEL ]
📄 index.php	5,111 B	[ EDIT ] \| [ DEL ]
📄 latest-comments.php	5,030 B	[ EDIT ] \| [ DEL ]
📄 latest-posts.php	8,734 B	[ EDIT ] \| [ DEL ]
📄 legacy-widget.php	4,011 B	[ EDIT ] \| [ DEL ]
📄 list.php	1,273 B	[ EDIT ] \| [ DEL ]
📄 loginout.php	1,664 B	[ EDIT ] \| [ DEL ]
📄 media-text.php	4,383 B	[ EDIT ] \| [ DEL ]
📄 navigation-link.php	13,961 B	[ EDIT ] \| [ DEL ]
📄 navigation-submenu.php	9,976 B	[ EDIT ] \| [ DEL ]
📄 navigation.php	49,550 B	[ EDIT ] \| [ DEL ]
📄 page-list-item.php	361 B	[ EDIT ] \| [ DEL ]
📄 page-list.php	13,611 B	[ EDIT ] \| [ DEL ]
📄 pattern.php	1,788 B	[ EDIT ] \| [ DEL ]
📄 post-author-biography.php	1,524 B	[ EDIT ] \| [ DEL ]
📄 post-author-name.php	1,951 B	[ EDIT ] \| [ DEL ]
📄 post-author.php	2,734 B	[ EDIT ] \| [ DEL ]
📄 post-comments-count.php	1,275 B	[ EDIT ] \| [ DEL ]
📄 post-comments-form.php	2,805 B	[ EDIT ] \| [ DEL ]
📄 post-comments-link.php	2,237 B	[ EDIT ] \| [ DEL ]
📄 post-content.php	2,347 B	[ EDIT ] \| [ DEL ]
📄 post-date.php	3,632 B	[ EDIT ] \| [ DEL ]
📄 post-excerpt.php	3,612 B	[ EDIT ] \| [ DEL ]
📄 post-featured-image.php	9,363 B	[ EDIT ] \| [ DEL ]
📄 post-navigation-link.php	4,837 B	[ EDIT ] \| [ DEL ]
📄 post-template.php	5,749 B	[ EDIT ] \| [ DEL ]
📄 post-terms.php	3,640 B	[ EDIT ] \| [ DEL ]
📄 post-time-to-read.php	6,493 B	[ EDIT ] \| [ DEL ]
📄 post-title.php	2,138 B	[ EDIT ] \| [ DEL ]
📄 query-no-results.php	1,847 B	[ EDIT ] \| [ DEL ]
📄 query-pagination-next.php	3,781 B	[ EDIT ] \| [ DEL ]
📄 query-pagination-numbers.php	4,770 B	[ EDIT ] \| [ DEL ]
📄 query-pagination-previous.php	3,578 B	[ EDIT ] \| [ DEL ]
📄 query-pagination.php	1,176 B	[ EDIT ] \| [ DEL ]
📄 query-title.php	2,943 B	[ EDIT ] \| [ DEL ]
📄 query-total.php	2,535 B	[ EDIT ] \| [ DEL ]
📄 query.php	5,690 B	[ EDIT ] \| [ DEL ]
📄 read-more.php	1,830 B	[ EDIT ] \| [ DEL ]
📄 require-dynamic-blocks.php	4,700 B	[ EDIT ] \| [ DEL ]
📄 require-static-blocks.php	558 B	[ EDIT ] \| [ DEL ]
📄 rss.php	4,609 B	[ EDIT ] \| [ DEL ]
📄 search.php	23,817 B	[ EDIT ] \| [ DEL ]
📄 shortcode.php	735 B	[ EDIT ] \| [ DEL ]
📄 site-logo.php	6,334 B	[ EDIT ] \| [ DEL ]
📄 site-tagline.php	1,203 B	[ EDIT ] \| [ DEL ]
📄 site-title.php	1,864 B	[ EDIT ] \| [ DEL ]
📄 social-link.php	67,735 B	[ EDIT ] \| [ DEL ]
📄 tag-cloud.php	1,590 B	[ EDIT ] \| [ DEL ]
📄 template-part.php	10,154 B	[ EDIT ] \| [ DEL ]
📄 term-count.php	1,843 B	[ EDIT ] \| [ DEL ]
📄 term-description.php	1,770 B	[ EDIT ] \| [ DEL ]
📄 term-name.php	2,069 B	[ EDIT ] \| [ DEL ]
📄 term-template.php	4,518 B	[ EDIT ] \| [ DEL ]
📄 video.php	2,733 B	[ EDIT ] \| [ DEL ]
📄 widget-group.php	2,438 B	[ EDIT ] \| [ DEL ]