1<?php
  2/**
  3 * Server-side rendering of the `core/tag-cloud` block.
  4 *
  5 * @package WordPress
  6 */
  7
  8/**
  9 * Renders the `core/tag-cloud` block on server.
 10 *
 11 * @since 5.2.0
 12 *
 13 * @param array $attributes The block attributes.
 14 *
 15 * @return string Returns the tag cloud for selected taxonomy.
 16 */
 17function render_block_core_tag_cloud( $attributes ) {
 18	$smallest_font_size = $attributes['smallestFontSize'];
 19	$unit               = ( preg_match( '/^[0-9.]+(?P<unit>[a-z%]+)$/i', $smallest_font_size, $m ) ? $m['unit'] : 'pt' );
 20
 21	$args      = array(
 22		'echo'       => false,
 23		'unit'       => $unit,
 24		'taxonomy'   => $attributes['taxonomy'],
 25		'show_count' => $attributes['showTagCounts'],
 26		'number'     => $attributes['numberOfTags'],
 27		'smallest'   => floatVal( $attributes['smallestFontSize'] ),
 28		'largest'    => floatVal( $attributes['largestFontSize'] ),
 29	);
 30	$tag_cloud = wp_tag_cloud( $args );
 31
 32	if ( empty( $tag_cloud ) ) {
 33		// Display placeholder content when there are no tags only in editor.
 34		if ( wp_is_serving_rest_request() ) {
 35			$tag_cloud = __( 'There&#8217;s no content to show here yet.' );
 36		} else {
 37			return '';
 38		}
 39	}
 40
 41	$wrapper_attributes = get_block_wrapper_attributes();
 42
 43	return sprintf(
 44		'<p %1$s>%2$s</p>',
 45		$wrapper_attributes,
 46		$tag_cloud
 47	);
 48}
 49
 50/**
 51 * Registers the `core/tag-cloud` block on server.
 52 *
 53 * @since 5.2.0
 54 */
 55function register_block_core_tag_cloud() {
 56	register_block_type_from_metadata(
 57		__DIR__ . '/tag-cloud',
 58		array(
 59			'render_callback' => 'render_block_core_tag_cloud',
 60		)
 61	);
 62}
 63add_action( 'init', 'register_block_core_tag_cloud' );
 64