interface Twig_ExtensionInterface

interface 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
   */
  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
   */
  function getTokenParsers();

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

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

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

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

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

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

  /**
   * Returns the name of the extension.
   *
   * @return string The extension name
   */
  function getName();

}