/*:nodoc:* * class ActionAppendConstant * * This stores a list, and appends the value specified by * the const keyword argument to the list. * (Note that the const keyword argument defaults to null.) * The 'appendConst' action is typically useful when multiple * arguments need to store constants to the same list. * * This class inherited from [[Action]] **/ 'use strict'; var util = require('util'); var Action = require('../../action'); /*:nodoc:* * new ActionAppendConstant(options) * - options (object): options hash see [[Action.new]] * **/var ActionAppendConstant = module.exports = function ActionAppendConstant(options) {  options = options || {};  options.nargs = 0;  if (typeof options.constant === 'undefined') {    throw new Error('constant option is required for appendAction');  }  Action.call(this, options);};util.inherits(ActionAppendConstant, Action); /*:nodoc:* * ActionAppendConstant#call(parser, namespace, values, optionString) -> Void * - parser (ArgumentParser): current parser * - namespace (Namespace): namespace for output data * - values (Array): parsed values * - optionString (Array): input option string(not parsed) * * Call the action. Save result in namespace object **/ActionAppendConstant.prototype.call = function (parser, namespace) {  var items = [].concat(namespace[this.dest] || []);  items.push(this.constant);  namespace.set(this.dest, items);};