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node_modules/argparse/lib/action/store.js 1.32 KB
aaac7fed   liuqimichale   add
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  /*:nodoc:*
   * class ActionStore
   *
   * This action just stores the arguments value. This is the default action.
   *
   * This class inherited from [[Action]]
   *
   **/
  'use strict';
  
  var util = require('util');
  
  var Action = require('../action');
  
  // Constants
  var c = require('../const');
  
  
  /*:nodoc:*
   * new ActionStore(options)
   * - options (object): options hash see [[Action.new]]
   *
   **/
  var ActionStore = module.exports = function ActionStore(options) {
    options = options || {};
    if (this.nargs <= 0) {
      throw new Error('nargs for store actions must be > 0; if you ' +
          'have nothing to store, actions such as store ' +
          'true or store const may be more appropriate');
  
    }
    if (typeof this.constant !== 'undefined' && this.nargs !== c.OPTIONAL) {
      throw new Error('nargs must be OPTIONAL to supply const');
    }
    Action.call(this, options);
  };
  util.inherits(ActionStore, Action);
  
  /*:nodoc:*
   * ActionStore#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
   **/
  ActionStore.prototype.call = function (parser, namespace, values) {
    namespace.set(this.dest, values);
  };