1<?php
  2/**
  3 * Server-side rendering of the `core/post-comments-form` block.
  4 *
  5 * @package WordPress
  6 */
  7
  8/**
  9 * Renders the `core/post-comments-form` block on the server.
 10 *
 11 * @since 6.0.0
 12 *
 13 * @param array    $attributes Block attributes.
 14 * @param string   $content    Block default content.
 15 * @param WP_Block $block      Block instance.
 16 * @return string Returns the filtered post comments form for the current post.
 17 */
 18function render_block_core_post_comments_form( $attributes, $content, $block ) {
 19	if ( ! isset( $block->context['postId'] ) ) {
 20		return '';
 21	}
 22
 23	if ( post_password_required( $block->context['postId'] ) ) {
 24		return;
 25	}
 26
 27	$classes = array( 'comment-respond' ); // See comment further below.
 28	if ( isset( $attributes['textAlign'] ) ) {
 29		$classes[] = 'has-text-align-' . $attributes['textAlign'];
 30	}
 31	if ( isset( $attributes['style']['elements']['link']['color']['text'] ) ) {
 32		$classes[] = 'has-link-color';
 33	}
 34	$wrapper_attributes = get_block_wrapper_attributes( array( 'class' => implode( ' ', $classes ) ) );
 35
 36	add_filter( 'comment_form_defaults', 'post_comments_form_block_form_defaults' );
 37
 38	ob_start();
 39	comment_form( array(), $block->context['postId'] );
 40	$form = ob_get_clean();
 41
 42	remove_filter( 'comment_form_defaults', 'post_comments_form_block_form_defaults' );
 43
 44	// We use the outermost wrapping `<div />` returned by `comment_form()`
 45	// which is identified by its default classname `comment-respond` to inject
 46	// our wrapper attributes. This way, it is guaranteed that all styling applied
 47	// to the block is carried along when the comment form is moved to the location
 48	// of the 'Reply' link that the user clicked by Core's `comment-reply.js` script.
 49	$form = str_replace( 'class="comment-respond"', $wrapper_attributes, $form );
 50
 51	// Enqueue the comment-reply script.
 52	wp_enqueue_script( 'comment-reply' );
 53
 54	return $form;
 55}
 56
 57/**
 58 * Registers the `core/post-comments-form` block on the server.
 59 *
 60 * @since 6.0.0
 61 */
 62function register_block_core_post_comments_form() {
 63	register_block_type_from_metadata(
 64		__DIR__ . '/post-comments-form',
 65		array(
 66			'render_callback' => 'render_block_core_post_comments_form',
 67		)
 68	);
 69}
 70add_action( 'init', 'register_block_core_post_comments_form' );
 71
 72/**
 73 * Use the button block classes for the form-submit button.
 74 *
 75 * @since 6.0.0
 76 *
 77 * @param array $fields The default comment form arguments.
 78 *
 79 * @return array Returns the modified fields.
 80 */
 81function post_comments_form_block_form_defaults( $fields ) {
 82	if ( wp_is_block_theme() ) {
 83		$fields['submit_button'] = '<input name="%1$s" type="submit" id="%2$s" class="wp-block-button__link ' . wp_theme_get_element_class_name( 'button' ) . '" value="%4$s" />';
 84		$fields['submit_field']  = '<p class="form-submit wp-block-button">%1$s %2$s</p>';
 85	}
 86
 87	return $fields;
 88}
 89