<?php

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/**

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* Server-side rendering of the `core/comments` block.

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*

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* @package WordPress

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*/

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/**

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* Renders the `core/comments` block on the server.

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*

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* This render callback is mainly for rendering a dynamic, legacy version of

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* this block (the old `core/post-comments`). It uses the `comments_template()`

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* function to generate the output, in the same way as classic PHP themes.

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*

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* As this callback will always run during SSR, first we need to check whether

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* the block is in legacy mode. If not, the HTML generated in the editor is

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* returned instead.

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*

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* @since 6.1.0

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*

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* @global WP_Post $post Global post object.

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*

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* @param array $attributes Block attributes.

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* @param string $content Block default content.

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* @param WP_Block $block Block instance.

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* @return string Returns the filtered post comments for the current post wrapped inside "p" tags.

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*/

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function render_block_core_comments( $attributes, $content, $block ) {

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global $post;

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$post_id = $block->context['postId'];

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if ( ! isset( $post_id ) ) {

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return '';

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}

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// Return early if there are no comments and comments are closed.

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if ( ! comments_open( $post_id ) && (int) get_comments_number( $post_id ) === 0 ) {

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return '';

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}

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// If this isn't the legacy block, we need to render the static version of this block.

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$is_legacy = 'core/post-comments' === $block->name || ! empty( $attributes['legacy'] );

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if ( ! $is_legacy ) {

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return $block->render( array( 'dynamic' => false ) );

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}

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$post_before = $post;

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$post = get_post( $post_id );

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setup_postdata( $post );

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ob_start();

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/*

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* There's a deprecation warning generated by WP Core.

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* Ideally this deprecation is removed from Core.

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* In the meantime, this removes it from the output.

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*/

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add_filter( 'deprecated_file_trigger_error', '__return_false' );

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comments_template();

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remove_filter( 'deprecated_file_trigger_error', '__return_false' );

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$output = ob_get_clean();

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$post = $post_before;

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$classnames = array();

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// Adds the old class name for styles' backwards compatibility.

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if ( isset( $attributes['legacy'] ) ) {

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$classnames[] = 'wp-block-post-comments';

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}

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if ( isset( $attributes['textAlign'] ) ) {

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$classnames[] = 'has-text-align-' . $attributes['textAlign'];

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}

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$wrapper_attributes = get_block_wrapper_attributes(

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array( 'class' => implode( ' ', $classnames ) )

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);

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/*

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* Enqueues scripts and styles required only for the legacy version. That is

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* why they are not defined in `block.json`.

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*/

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wp_enqueue_script( 'comment-reply' );

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enqueue_legacy_post_comments_block_styles( $block->name );

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return sprintf( '<div %1$s>%2$s</div>', $wrapper_attributes, $output );

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}

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/**

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* Registers the `core/comments` block on the server.

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*

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* @since 6.1.0

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*/

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function register_block_core_comments() {

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register_block_type_from_metadata(

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__DIR__ . '/comments',

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array(

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'render_callback' => 'render_block_core_comments',

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'skip_inner_blocks' => true,

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)

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);

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}

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add_action( 'init', 'register_block_core_comments' );

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/**

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* Use the button block classes for the form-submit button.

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*

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* @since 6.1.0

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*

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* @param array $fields The default comment form arguments.

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*

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* @return array Returns the modified fields.

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*/

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function comments_block_form_defaults( $fields ) {

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if ( wp_is_block_theme() ) {

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$fields['submit_button'] = '<input name="%1$s" type="submit" id="%2$s" class="%3$s wp-block-button__link ' . wp_theme_get_element_class_name( 'button' ) . '" value="%4$s" />';

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$fields['submit_field'] = '<p class="form-submit wp-block-button">%1$s %2$s</p>';

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}

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return $fields;

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}

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add_filter( 'comment_form_defaults', 'comments_block_form_defaults' );

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/**

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* Enqueues styles from the legacy `core/post-comments` block. These styles are

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* required only by the block's fallback.

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*

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* @since 6.1.0

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*

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* @param string $block_name Name of the new block type.

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*/

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function enqueue_legacy_post_comments_block_styles( $block_name ) {

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static $are_styles_enqueued = false;

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if ( ! $are_styles_enqueued ) {

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$handles = array(

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'wp-block-post-comments',

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'wp-block-buttons',

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'wp-block-button',

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);

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foreach ( $handles as $handle ) {

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wp_enqueue_block_style( $block_name, array( 'handle' => $handle ) );

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}

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$are_styles_enqueued = true;

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}

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}

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/**

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* Ensures backwards compatibility for any users running the Gutenberg plugin

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* who have used Post Comments before it was merged into Comments Query Loop.

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*

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* The same approach was followed when core/query-loop was renamed to

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* core/post-template.

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*

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* @since 6.1.0

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*

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* @see https://github.com/WordPress/gutenberg/pull/41807

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* @see https://github.com/WordPress/gutenberg/pull/32514

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*/

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function register_legacy_post_comments_block() {

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$registry = WP_Block_Type_Registry::get_instance();

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/*

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* Remove the old `post-comments` block if it was already registered, as it

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* is about to be replaced by the type defined below.

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*/

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if ( $registry->is_registered( 'core/post-comments' ) ) {

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unregister_block_type( 'core/post-comments' );

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}

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// Recreate the legacy block metadata.

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$metadata = array(

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'name' => 'core/post-comments',

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'category' => 'theme',

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'attributes' => array(

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'textAlign' => array(

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'type' => 'string',

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),

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),

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'uses_context' => array(

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'postId',

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'postType',

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),

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'supports' => array(

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'html' => false,

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'align' => array( 'wide', 'full' ),

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'typography' => array(

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'fontSize' => true,

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'lineHeight' => true,

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'__experimentalFontStyle' => true,

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'__experimentalFontWeight' => true,

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'__experimentalLetterSpacing' => true,

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'__experimentalTextTransform' => true,

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'__experimentalDefaultControls' => array(

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'fontSize' => true,

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),

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),

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'color' => array(

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'gradients' => true,

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'link' => true,

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'__experimentalDefaultControls' => array(

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'background' => true,

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'text' => true,

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),

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),

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'inserter' => false,

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),

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'style' => array(

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'wp-block-post-comments',

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'wp-block-buttons',

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'wp-block-button',

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),

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'render_callback' => 'render_block_core_comments',

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'skip_inner_blocks' => true,

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);

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/*

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* Filters the metadata object, the same way it's done inside

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* `register_block_type_from_metadata()`. This applies some default filters,

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* like `_wp_multiple_block_styles`, which is required in this case because

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* the block has multiple styles.

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*/

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/** This filter is documented in wp-includes/blocks.php */

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$metadata = apply_filters( 'block_type_metadata', $metadata );

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register_block_type( 'core/post-comments', $metadata );

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}

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add_action( 'init', 'register_legacy_post_comments_block', 21 );

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