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constant.js (1430B)

      1 /*:nodoc:*
      2  * class ActionAppendConstant
      3  *
      4  * This stores a list, and appends the value specified by
      5  * the const keyword argument to the list.
      6  * (Note that the const keyword argument defaults to null.)
      7  * The 'appendConst' action is typically useful when multiple
      8  * arguments need to store constants to the same list.
      9  *
     10  * This class inherited from [[Action]]
     11  **/
     12 
     13 'use strict';
     14 
     15 var util = require('util');
     16 
     17 var Action = require('../../action');
     18 
     19 /*:nodoc:*
     20  * new ActionAppendConstant(options)
     21  * - options (object): options hash see [[Action.new]]
     22  *
     23  **/
     24 var ActionAppendConstant = module.exports = function ActionAppendConstant(options) {
     25   options = options || {};
     26   options.nargs = 0;
     27   if (typeof options.constant === 'undefined') {
     28     throw new Error('constant option is required for appendAction');
     29   }
     30   Action.call(this, options);
     31 };
     32 util.inherits(ActionAppendConstant, Action);
     33 
     34 /*:nodoc:*
     35  * ActionAppendConstant#call(parser, namespace, values, optionString) -> Void
     36  * - parser (ArgumentParser): current parser
     37  * - namespace (Namespace): namespace for output data
     38  * - values (Array): parsed values
     39  * - optionString (Array): input option string(not parsed)
     40  *
     41  * Call the action. Save result in namespace object
     42  **/
     43 ActionAppendConstant.prototype.call = function (parser, namespace) {
     44   var items = [].concat(namespace[this.dest] || []);
     45   items.push(this.constant);
     46   namespace.set(this.dest, items);
     47 };