imptest/src/lib/utils/promiseWhile.js

Electric Imp Test Runner

// MIT License
//
// Copyright 2016 Electric Imp
//
// SPDX-License-Identifier: MIT
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
// EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES
// OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.

/**
 * Loop with promises
 */

'use strict';

/**
 * While loop with promises
 * @param {function} condition
 * @param {function} action
 * @return {Priomise}
 */
module.exports = function promiseWhile(condition, action) {
  return new Promise((resolve, reject) => {

    const loop = () => {
      if (condition()) {
        action().then(() => {
          process.nextTick(loop);
        }, reject);
      } else {
        resolve();
      }
    };

    process.nextTick(loop);
  });
};