/*:nodoc:* * class ActionHelp * * Support action for printing help * This class inherided from [[Action]] **/'use strict'; var util = require('util'); var Action = require('../action'); // Constantsvar c  = require('../const'); /*:nodoc:* * new ActionHelp(options) * - options (object): options hash see [[Action.new]] * **/var ActionHelp = module.exports = function ActionHelp(options) {  options = options || {};  if (options.defaultValue !== null) {    options.defaultValue = options.defaultValue;  } else {    options.defaultValue = c.SUPPRESS;  }  options.dest = (options.dest !== null ? options.dest : c.SUPPRESS);  options.nargs = 0;  Action.call(this, options); };util.inherits(ActionHelp, Action); /*:nodoc:* * ActionHelp#call(parser, namespace, values, optionString) * - parser (ArgumentParser): current parser * - namespace (Namespace): namespace for output data * - values (Array): parsed values * - optionString (Array): input option string(not parsed) * * Print help and exit **/ActionHelp.prototype.call = function (parser) {  parser.printHelp();  parser.exit();};