text: /*
   * Copyright 2015 Google Inc. All Rights Reserved.
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  var Util = window.Util || {};
  
  Util.MIN_TIMESTEP = 0.001;
  Util.MAX_TIMESTEP = 1;
  
  Util.clamp = function(value, min, max) {
    return Math.min(Math.max(min, value), max);
  };
  
  Util.isIOS = function() {
    return /iPad|iPhone|iPod/.test(navigator.platform);
  };
  
  Util.isFirefoxAndroid = function() {
    return navigator.userAgent.indexOf('Firefox') !== -1 && navigator.userAgent.indexOf('Android') !== -1;
  }
  
  // Helper method to validate the time steps of sensor timestamps.
  Util.isTimestampDeltaValid = function(timestampDeltaS) {
    if (isNaN(timestampDeltaS)) {
      return false;
    }
    if (timestampDeltaS <= Util.MIN_TIMESTEP) {
      return false;
    }
    if (timestampDeltaS > Util.MAX_TIMESTEP) {
      return false;
    }
    return true;
  }
  
  module.exports = Util;
  