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/*: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);
};
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