aaac7fed
 liuqimichale
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/** internal
* class MutuallyExclusiveGroup
*
* Group arguments.
* By default, ArgumentParser groups command-line arguments
* into “positional arguments” and “optional arguments”
* when displaying help messages. When there is a better
* conceptual grouping of arguments than this default one,
* appropriate groups can be created using the addArgumentGroup() method
*
* This class inherited from [[ArgumentContainer]]
**/
'use strict';
var util = require('util');
var ArgumentGroup = require('./group');
/**
* new MutuallyExclusiveGroup(container, options)
* - container (object): main container
* - options (object): options.required -> true/false
*
* `required` could be an argument itself, but making it a property of
* the options argument is more consistent with the JS adaptation of the Python)
**/
var MutuallyExclusiveGroup = module.exports = function MutuallyExclusiveGroup(container, options) {
var required;
options = options || {};
required = options.required || false;
ArgumentGroup.call(this, container);
this.required = required;
};
util.inherits(MutuallyExclusiveGroup, ArgumentGroup);
MutuallyExclusiveGroup.prototype._addAction = function (action) {
var msg;
if (action.required) {
msg = 'mutually exclusive arguments must be optional';
throw new Error(msg);
}
action = this._container._addAction(action);
this._groupActions.push(action);
return action;
};
MutuallyExclusiveGroup.prototype._removeAction = function (action) {
this._container._removeAction(action);
this._groupActions.remove(action);
};
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