/*

* class ActionStoreConstant
*
* This action stores the value specified by the const keyword argument.
* (Note that the const keyword argument defaults to the rather unhelpful null.)
* The 'store_const' action is most commonly used with optional
* arguments that specify some sort of flag.
*
* This class inherited from [[Action]]
**/

'use strict';

var util = require('util');

var Action = require('../../action');

/*

* new ActionStoreConstant(options)
* - options (object): options hash see [[Action.new]]
*
**/

var ActionStoreConstant = module.exports = function ActionStoreConstant(options) {

options = options || {};
options.nargs = 0;
if (typeof options.constant === 'undefined') {
  throw new Error('constant option is required for storeAction');
}
Action.call(this, options);

}; util.inherits(ActionStoreConstant, Action);

/*

* ActionStoreConstant#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
**/

ActionStoreConstant.prototype.call = function (parser, namespace) {

namespace.set(this.dest, this.constant);

};