phorge-phorge/src/applications/search/field/PhabricatorSearchTokenizerField.php

<?php

abstract class PhabricatorSearchTokenizerField
  extends PhabricatorSearchField {

  protected function getDefaultValue() {
    return array();
  }

  protected function getValueFromRequest(AphrontRequest $request, $key) {
    return $this->getListFromRequest($request, $key);
  }

  protected function newControl() {
    return id(new AphrontFormTokenizerControl())
      ->setDatasource($this->newDatasource());
  }

  abstract protected function newDatasource();

}