abstract class Twig_Extension

abstract class Twig_Extension implements Twig_ExtensionInterface {

  /**
   * Initializes the runtime environment.
   *
   * This is where you can load some file that contains filter functions for instance.
   *
   * @param Twig_Environment $environment The current Twig_Environment instance
   */
  public function initRuntime(Twig_Environment $environment) {
  }

  /**
   * Returns the token parser instances to add to the existing list.
   *
   * @return array An array of Twig_TokenParserInterface or Twig_TokenParserBrokerInterface instances
   */
  public function getTokenParsers() {
    return array();
  }

  /**
   * Returns the node visitor instances to add to the existing list.
   *
   * @return array An array of Twig_NodeVisitorInterface instances
   */
  public function getNodeVisitors() {
    return array();
  }

  /**
   * Returns a list of filters to add to the existing list.
   *
   * @return array An array of filters
   */
  public function getFilters() {
    return array();
  }

  /**
   * Returns a list of tests to add to the existing list.
   *
   * @return array An array of tests
   */
  public function getTests() {
    return array();
  }

  /**
   * Returns a list of functions to add to the existing list.
   *
   * @return array An array of functions
   */
  public function getFunctions() {
    return array();
  }

  /**
   * Returns a list of operators to add to the existing list.
   *
   * @return array An array of operators
   */
  public function getOperators() {
    return array();
  }

  /**
   * Returns a list of global variables to add to the existing list.
   *
   * @return array An array of global variables
   */
  public function getGlobals() {
    return array();
  }

}