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   1  <?php
   2  /**
   3   * Server-side rendering of the `core/post-comments` block.
   4   *
   5   * @package WordPress
   6   */
   7  
   8  /**
   9   * Renders the `core/post-comments` block on the server.
  10   *
  11   * @param array    $attributes Block attributes.
  12   * @param string   $content    Block default content.
  13   * @param WP_Block $block      Block instance.
  14   * @return string Returns the filtered post comments for the current post wrapped inside "p" tags.
  15   */
  16  function render_block_core_post_comments( $attributes, $content, $block ) {
  17      global $post;
  18  
  19      $post_id = $block->context['postId'];
  20      if ( ! isset( $post_id ) ) {
  21          return '';
  22      }
  23  
  24      $comment_args = array(
  25          'post_id' => $post_id,
  26          'count'   => true,
  27      );
  28      // Return early if there are no comments and comments are closed.
  29      if ( ! comments_open( $post_id ) && get_comments( $comment_args ) === 0 ) {
  30          return '';
  31      }
  32  
  33      $post_before = $post;
  34      $post        = get_post( $post_id );
  35      setup_postdata( $post );
  36  
  37      ob_start();
  38      // There's a deprecation warning generated by WP Core.
  39      // Ideally this deprecation is removed from Core.
  40      // In the meantime, this removes it from the output.
  41      add_filter( 'deprecated_file_trigger_error', '__return_false' );
  42      comments_template();
  43      remove_filter( 'deprecated_file_trigger_error', '__return_false' );
  44      $post = $post_before;
  45  
  46      $classes = '';
  47      if ( isset( $attributes['textAlign'] ) ) {
  48          $classes .= 'has-text-align-' . $attributes['textAlign'];
  49      }
  50  
  51      $wrapper_attributes = get_block_wrapper_attributes( array( 'class' => $classes ) );
  52      $output             = ob_get_clean();
  53  
  54      return sprintf( '<div %1$s>%2$s</div>', $wrapper_attributes, $output );
  55  }
  56  
  57  /**
  58   * Registers the `core/post-comments` block on the server.
  59   */
  60  function register_block_core_post_comments() {
  61      register_block_type_from_metadata(
  62          __DIR__ . '/post-comments',
  63          array(
  64              'render_callback' => 'render_block_core_post_comments',
  65          )
  66      );
  67  }
  68  add_action( 'init', 'register_block_core_post_comments' );
  69  
  70  /**
  71   * Use the button block classes for the form-submit button.
  72   *
  73   * @param array $fields The default comment form arguments.
  74   *
  75   * @return array Returns the modified fields.
  76   */
  77  function post_comments_block_form_defaults( $fields ) {
  78      if ( wp_is_block_theme() ) {
  79          $fields['submit_button'] = '<input name="%1$s" type="submit" id="%2$s" class="%3$s wp-block-button__link" value="%4$s" />';
  80          $fields['submit_field']  = '<p class="form-submit wp-block-button">%1$s %2$s</p>';
  81      }
  82  
  83      return $fields;
  84  }
  85  add_filter( 'comment_form_defaults', 'post_comments_block_form_defaults' );