Roles.php

1. 9.x drupal/core/modules/user/lib/Drupal/user/Plugin/views/field/Roles.php
2. 9.x drupal/core/modules/user/lib/Drupal/user/Plugin/views/filter/Roles.php

<?php

/**
 * @file
 * Definition of Drupal\user\Plugin\views\field\Roles.
 */
namespace Drupal\user\Plugin\views\field;

use Drupal\Core\Annotation\Plugin;
use Drupal\views\ViewExecutable;
use Drupal\views\Plugin\views\field\PrerenderList;

/**
 * Field handler to provide a list of roles.
 *
 * @ingroup views_field_handlers
 *
 * @Plugin(
 *   id = "user_roles",
 *   module = "user"
 * )
 */
class Roles extends PrerenderList {

  /**
   * Overrides Drupal\views\Plugin\views\field\FieldPluginBase::init().
   */
  public function init(ViewExecutable $view, &$options) {
    parent::init($view, $options);
    $this->additional_fields['uid'] = array(
      'table' => 'users',
      'field' => 'uid',
    );
  }
  public function query() {
    $this
      ->add_additional_fields();
    $this->field_alias = $this->aliases['uid'];
  }
  function pre_render(&$values) {
    $uids = array();
    $this->items = array();
    foreach ($values as $result) {
      $uids[] = $this
        ->get_value($result);
    }
    if ($uids) {
      $query = db_select('role', 'r');
      $query
        ->join('users_roles', 'u', 'u.rid = r.rid');
      $query
        ->addField('r', 'name');
      $query
        ->fields('u', array(
        'uid',
        'rid',
      ));
      $query
        ->condition('u.uid', $uids);
      $query
        ->orderBy('r.name');
      $result = $query
        ->execute();
      foreach ($result as $role) {
        $this->items[$role->uid][$role->rid]['role'] = check_plain($role->name);
        $this->items[$role->uid][$role->rid]['rid'] = $role->rid;
      }
    }
  }
  function render_item($count, $item) {
    return $item['role'];
  }
  function document_self_tokens(&$tokens) {
    $tokens['[' . $this->options['id'] . '-role' . ']'] = t('The name of the role.');
    $tokens['[' . $this->options['id'] . '-rid' . ']'] = t('The role machine-name of the role.');
  }
  function add_self_tokens(&$tokens, $item) {
    if (!empty($item['role'])) {
      $tokens['[' . $this->options['id'] . '-role' . ']'] = $item['role'];
      $tokens['[' . $this->options['id'] . '-rid' . ']'] = $item['rid'];
    }
  }

}