Name.php

1. 8.x drupal/core/vendor/twig/twig/lib/Twig/Node/Expression/Name.php
2. 8.x drupal/core/modules/user/lib/Drupal/user/Plugin/views/field/Name.php
3. 8.x drupal/core/modules/user/lib/Drupal/user/Plugin/views/filter/Name.php

<?php

/**
 * @file
 * Definition of Drupal\user\Plugin\views\filter\Name.
 */
namespace Drupal\user\Plugin\views\filter;

use Drupal\views\Plugin\views\filter\InOperator;
use Drupal\Component\Annotation\PluginID;

/**
 * Filter handler for usernames.
 *
 * @ingroup views_filter_handlers
 *
 * @PluginID("user_name")
 */
class Name extends InOperator {
  var $always_multiple = TRUE;
  protected function valueForm(&$form, &$form_state) {
    $values = array();
    if ($this->value) {
      $result = entity_load_multiple_by_properties('user', array(
        'uid' => $this->value,
      ));
      foreach ($result as $account) {
        if ($account
          ->id()) {
          $values[] = $account->name->value;
        }
        else {
          $values[] = 'Anonymous';

          // Intentionally NOT translated.
        }
      }
    }
    sort($values);
    $default_value = implode(', ', $values);
    $form['value'] = array(
      '#type' => 'textfield',
      '#title' => t('Usernames'),
      '#description' => t('Enter a comma separated list of user names.'),
      '#default_value' => $default_value,
      '#autocomplete_path' => 'user/autocomplete/anonymous',
    );
    if (!empty($form_state['exposed']) && !isset($form_state['input'][$this->options['expose']['identifier']])) {
      $form_state['input'][$this->options['expose']['identifier']] = $default_value;
    }
  }
  protected function valueValidate($form, &$form_state) {
    $values = drupal_explode_tags($form_state['values']['options']['value']);
    $uids = $this
      ->validate_user_strings($form['value'], $values);
    if ($uids) {
      $form_state['values']['options']['value'] = $uids;
    }
  }
  public function acceptExposedInput($input) {
    $rc = parent::acceptExposedInput($input);
    if ($rc) {

      // If we have previously validated input, override.
      if (isset($this->validated_exposed_input)) {
        $this->value = $this->validated_exposed_input;
      }
    }
    return $rc;
  }
  public function validateExposed(&$form, &$form_state) {
    if (empty($this->options['exposed'])) {
      return;
    }
    if (empty($this->options['expose']['identifier'])) {
      return;
    }
    $identifier = $this->options['expose']['identifier'];
    $input = $form_state['values'][$identifier];
    if ($this->options['is_grouped'] && isset($this->options['group_info']['group_items'][$input])) {
      $this->operator = $this->options['group_info']['group_items'][$input]['operator'];
      $input = $this->options['group_info']['group_items'][$input]['value'];
    }
    $values = drupal_explode_tags($input);
    if (!$this->options['is_grouped'] || $this->options['is_grouped'] && $input != 'All') {
      $uids = $this
        ->validate_user_strings($form[$identifier], $values);
    }
    else {
      $uids = FALSE;
    }
    if ($uids) {
      $this->validated_exposed_input = $uids;
    }
  }

  /**
   * Validate the user string. Since this can come from either the form
   * or the exposed filter, this is abstracted out a bit so it can
   * handle the multiple input sources.
   */
  function validate_user_strings(&$form, $values) {
    $uids = array();
    $placeholders = array();
    $args = array();
    $results = array();
    foreach ($values as $value) {
      if (strtolower($value) == 'anonymous') {
        $uids[] = 0;
      }
      else {
        $missing[strtolower($value)] = TRUE;
        $args[] = $value;
        $placeholders[] = "'%s'";
      }
    }
    if (!$args) {
      return $uids;
    }
    $result = entity_load_multiple_by_properties('user', array(
      'name' => $args,
    ));
    foreach ($result as $account) {
      unset($missing[strtolower($account->name->value)]);
      $uids[] = $account
        ->id();
    }
    if ($missing) {
      form_error($form, format_plural(count($missing), 'Unable to find user: @users', 'Unable to find users: @users', array(
        '@users' => implode(', ', array_keys($missing)),
      )));
    }
    return $uids;
  }
  protected function valueSubmit($form, &$form_state) {

    // prevent array filter from removing our anonymous user.
  }

  // Override to do nothing.
  public function getValueOptions() {
  }
  public function adminSummary() {

    // set up $this->value_options for the parent summary
    $this->value_options = array();
    if ($this->value) {
      $result = entity_load_multiple_by_properties('user', array(
        'uid' => $this->value,
      ));
      foreach ($result as $account) {
        if ($account->uid) {
          $this->value_options[$account
            ->id()] = $account
            ->label();
        }
        else {
          $this->value_options[$account
            ->id()] = 'Anonymous';

          // Intentionally NOT translated.
        }
      }
    }
    return parent::adminSummary();
  }

}