<?php

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/**

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

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*

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* @package WordPress

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*/

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/**

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* Function that recursively renders a list of nested comments.

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*

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* @since 6.3.0 Changed render_block_context priority to `1`.

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*

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* @global int $comment_depth

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*

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* @param WP_Comment[] $comments The array of comments.

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* @param WP_Block $block Block instance.

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* @return string

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*/

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function block_core_comment_template_render_comments( $comments, $block ) {

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global $comment_depth;

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$thread_comments = get_option( 'thread_comments' );

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$thread_comments_depth = get_option( 'thread_comments_depth' );

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if ( empty( $comment_depth ) ) {

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$comment_depth = 1;

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}

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$content = '';

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foreach ( $comments as $comment ) {

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$comment_id = $comment->comment_ID;

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$filter_block_context = static function ( $context ) use ( $comment_id ) {

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$context['commentId'] = $comment_id;

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return $context;

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};

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/*

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* We set commentId context through the `render_block_context` filter so

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* that dynamically inserted blocks (at `render_block` filter stage)

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* will also receive that context.

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*

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* Use an early priority to so that other 'render_block_context' filters

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* have access to the values.

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*/

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add_filter( 'render_block_context', $filter_block_context, 1 );

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/*

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* We construct a new WP_Block instance from the parsed block so that

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* it'll receive any changes made by the `render_block_data` filter.

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*/

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$block_content = ( new WP_Block( $block->parsed_block ) )->render( array( 'dynamic' => false ) );

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remove_filter( 'render_block_context', $filter_block_context, 1 );

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$children = $comment->get_children();

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/*

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* We need to create the CSS classes BEFORE recursing into the children.

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* This is because comment_class() uses globals like `$comment_alt`

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* and `$comment_thread_alt` which are order-sensitive.

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*

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* The `false` parameter at the end means that we do NOT want the function

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* to `echo` the output but to return a string.

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* See https://developer.wordpress.org/reference/functions/comment_class/#parameters.

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*/

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$comment_classes = comment_class( '', $comment->comment_ID, $comment->comment_post_ID, false );

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// If the comment has children, recurse to create the HTML for the nested

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// comments.

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if ( ! empty( $children ) && ! empty( $thread_comments ) ) {

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if ( $comment_depth < $thread_comments_depth ) {

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++$comment_depth;

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$inner_content = block_core_comment_template_render_comments(

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$children,

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$block

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);

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$block_content .= sprintf( '<ol>%1$s</ol>', $inner_content );

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--$comment_depth;

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} else {

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$block_content .= block_core_comment_template_render_comments(

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$children,

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$block

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);

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}

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}

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$content .= sprintf( '<li id="comment-%1$s" %2$s>%3$s</li>', $comment->comment_ID, $comment_classes, $block_content );

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}

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return $content;

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}

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/**

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* Renders the `core/comment-template` block on the server.

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*

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* @since 6.0.0

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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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*

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* @return string Returns the HTML representing the comments using the layout

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* defined by the block's inner blocks.

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*/

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

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// Bail out early if the post ID is not set for some reason.

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if ( empty( $block->context['postId'] ) ) {

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return '';

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}

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if ( post_password_required( $block->context['postId'] ) ) {

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return;

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}

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$comment_query = new WP_Comment_Query(

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build_comment_query_vars_from_block( $block )

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);

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// Get an array of comments for the current post.

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$comments = $comment_query->get_comments();

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if ( count( $comments ) === 0 ) {

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return '';

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}

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$comment_order = get_option( 'comment_order' );

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if ( 'desc' === $comment_order ) {

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$comments = array_reverse( $comments );

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}

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$wrapper_attributes = get_block_wrapper_attributes();

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return sprintf(

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'<ol %1$s>%2$s</ol>',

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$wrapper_attributes,

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block_core_comment_template_render_comments( $comments, $block )

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);

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}

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/**

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* Registers the `core/comment-template` block on the server.

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*

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* @since 6.0.0

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*/

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function register_block_core_comment_template() {

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register_block_type_from_metadata(

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__DIR__ . '/comment-template',

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array(

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'render_callback' => 'render_block_core_comment_template',

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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_comment_template' );

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