/*:nodoc:* * class ActionAppend * * This action stores a list, and appends each argument value to the list. * This is useful to allow an option to be specified multiple times. * This class inherided from [[Action]] * **/ 'use strict'; var util = require('util'); var Action = require('../action'); // Constantsvar c = require('../const'); /*:nodoc:* * new ActionAppend(options) * - options (object): options hash see [[Action.new]] * * Note: options.nargs should be optional for constants * and more then zero for other **/var ActionAppend = module.exports = function ActionAppend(options) {  options = options || {};  if (this.nargs <= 0) {    throw new Error('nargs for append actions must be > 0; if arg ' +        'strings are not supplying the value to append, ' +        'the append const action may be more appropriate');  }  if (!!this.constant && this.nargs !== c.OPTIONAL) {    throw new Error('nargs must be OPTIONAL to supply const');  }  Action.call(this, options);};util.inherits(ActionAppend, Action); /*:nodoc:* * ActionAppend#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 **/ActionAppend.prototype.call = function (parser, namespace, values) {  var items = (namespace[this.dest] || []).slice();  items.push(values);  namespace.set(this.dest, items);};