Flow Coverage Report - src/utils/task.js

Go back to all files summary.

Filename	Percent	Total	Covered	Uncovered
src/utils/task.js	27 %	58	16	42

/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80 filetype=javascript: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

/**
 * This object provides the public module functions.
 */
const Task = {
  // XXX: Not sure if this works in all cases...
  async: function(task) {
    return function() {
      return Task.spawn(task, this, arguments);
    };
  },

  /**
   * Creates and starts a new task.
   * @param task A generator function
   * @return A promise, resolved when the task terminates
   */
  spawn: function(task, scope, args) {
    return new Promise(function(resolve, reject) {
      const iterator = task.apply(scope, args);

      const callNext = lastValue => {
        const iteration = iterator.next(lastValue);
        Promise.resolve(iteration.value)
          .then(value => {
            if (iteration.done) {
              resolve(value);
            } else {
              callNext(value);
            }
          })
          .catch(error => {
            reject(error);
            iterator.throw(error);
          });
      };

      callNext(undefined);
    });
  }
};

export { Task };

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