text: /*!
   * Platform.js
   * Copyright 2014-2018 Benjamin Tan
   * Copyright 2011-2013 John-David Dalton
   * Available under MIT license
   */
  ;(function() {
    'use strict';
  
    /** Used to determine if values are of the language type `Object`. */
    var objectTypes = {
      'function': true,
      'object': true
    };
  
    /** Used as a reference to the global object. */
    var root = (objectTypes[typeof window] && window) || this;
  
    /** Backup possible global object. */
    var oldRoot = root;
  
    /** Detect free variable `exports`. */
    var freeExports = objectTypes[typeof exports] && exports;
  
    /** Detect free variable `module`. */
    var freeModule = objectTypes[typeof module] && module && !module.nodeType && module;
  
    /** Detect free variable `global` from Node.js or Browserified code and use it as `root`. */
    var freeGlobal = freeExports && freeModule && typeof global == 'object' && global;
    if (freeGlobal && (freeGlobal.global === freeGlobal || freeGlobal.window === freeGlobal || freeGlobal.self === freeGlobal)) {
      root = freeGlobal;
    }
  
    /**
     * Used as the maximum length of an array-like object.
     * See the [ES6 spec](http://people.mozilla.org/~jorendorff/es6-draft.html#sec-tolength)
     * for more details.
     */
    var maxSafeInteger = Math.pow(2, 53) - 1;
  
    /** Regular expression to detect Opera. */
    var reOpera = /\bOpera/;
  
    /** Possible global object. */
    var thisBinding = this;
  
    /** Used for native method references. */
    var objectProto = Object.prototype;
  
    /** Used to check for own properties of an object. */
    var hasOwnProperty = objectProto.hasOwnProperty;
  
    /** Used to resolve the internal `[[Class]]` of values. */
    var toString = objectProto.toString;
  
    /*--------------------------------------------------------------------------*/
  
    /**
     * Capitalizes a string value.
     *
     * @private
     * @param {string} string The string to capitalize.
     * @returns {string} The capitalized string.
     */
    function capitalize(string) {
      string = String(string);
      return string.charAt(0).toUpperCase() + string.slice(1);
    }
  
    /**
     * A utility function to clean up the OS name.
     *
     * @private
     * @param {string} os The OS name to clean up.
     * @param {string} [pattern] A `RegExp` pattern matching the OS name.
     * @param {string} [label] A label for the OS.
     */
    function cleanupOS(os, pattern, label) {
      // Platform tokens are defined at:
      // http://msdn.microsoft.com/en-us/library/ms537503(VS.85).aspx
      // http://web.archive.org/web/20081122053950/http://msdn.microsoft.com/en-us/library/ms537503(VS.85).aspx
      var data = {
        '10.0': '10',
        '6.4':  '10 Technical Preview',
        '6.3':  '8.1',
        '6.2':  '8',
        '6.1':  'Server 2008 R2 / 7',
        '6.0':  'Server 2008 / Vista',
        '5.2':  'Server 2003 / XP 64-bit',
        '5.1':  'XP',
        '5.01': '2000 SP1',
        '5.0':  '2000',
        '4.0':  'NT',
        '4.90': 'ME'
      };
      // Detect Windows version from platform tokens.
      if (pattern && label && /^Win/i.test(os) && !/^Windows Phone /i.test(os) &&
          (data = data[/[\d.]+$/.exec(os)])) {
        os = 'Windows ' + data;
      }
      // Correct character case and cleanup string.
      os = String(os);
  
      if (pattern && label) {
        os = os.replace(RegExp(pattern, 'i'), label);
      }
  
      os = format(
        os.replace(/ ce$/i, ' CE')
          .replace(/\bhpw/i, 'web')
          .replace(/\bMacintosh\b/, 'Mac OS')
          .replace(/_PowerPC\b/i, ' OS')
          .replace(/\b(OS X) [^ \d]+/i, '$1')
          .replace(/\bMac (OS X)\b/, '$1')
          .replace(/\/(\d)/, ' $1')
          .replace(/_/g, '.')
          .replace(/(?: BePC|[ .]*fc[ \d.]+)$/i, '')
          .replace(/\bx86\.64\b/gi, 'x86_64')
          .replace(/\b(Windows Phone) OS\b/, '$1')
          .replace(/\b(Chrome OS \w+) [\d.]+\b/, '$1')
          .split(' on ')[0]
      );
  
      return os;
    }
  
    /**
     * An iteration utility for arrays and objects.
     *
     * @private
     * @param {Array|Object} object The object to iterate over.
     * @param {Function} callback The function called per iteration.
     */
    function each(object, callback) {
      var index = -1,
          length = object ? object.length : 0;
  
      if (typeof length == 'number' && length > -1 && length <= maxSafeInteger) {
        while (++index < length) {
          callback(object[index], index, object);
        }
      } else {
        forOwn(object, callback);
      }
    }
  
    /**
     * Trim and conditionally capitalize string values.
     *
     * @private
     * @param {string} string The string to format.
     * @returns {string} The formatted string.
     */
    function format(string) {
      string = trim(string);
      return /^(?:webOS|i(?:OS|P))/.test(string)
        ? string
        : capitalize(string);
    }
  
    /**
     * Iterates over an object's own properties, executing the `callback` for each.
     *
     * @private
     * @param {Object} object The object to iterate over.
     * @param {Function} callback The function executed per own property.
     */
    function forOwn(object, callback) {
      for (var key in object) {
        if (hasOwnProperty.call(object, key)) {
          callback(object[key], key, object);
        }
      }
    }
  
    /**
     * Gets the internal `[[Class]]` of a value.
     *
     * @private
     * @param {*} value The value.
     * @returns {string} The `[[Class]]`.
     */
    function getClassOf(value) {
      return value == null
        ? capitalize(value)
        : toString.call(value).slice(8, -1);
    }
  
    /**
     * Host objects can return type values that are different from their actual
     * data type. The objects we are concerned with usually return non-primitive
     * types of "object", "function", or "unknown".
     *
     * @private
     * @param {*} object The owner of the property.
     * @param {string} property The property to check.
     * @returns {boolean} Returns `true` if the property value is a non-primitive, else `false`.
     */
    function isHostType(object, property) {
      var type = object != null ? typeof object[property] : 'number';
      return !/^(?:boolean|number|string|undefined)$/.test(type) &&
        (type == 'object' ? !!object[property] : true);
    }
  
    /**
     * Prepares a string for use in a `RegExp` by making hyphens and spaces optional.
     *
     * @private
     * @param {string} string The string to qualify.
     * @returns {string} The qualified string.
     */
    function qualify(string) {
      return String(string).replace(/([ -])(?!$)/g, '$1?');
    }
  
    /**
     * A bare-bones `Array#reduce` like utility function.
     *
     * @private
     * @param {Array} array The array to iterate over.
     * @param {Function} callback The function called per iteration.
     * @returns {*} The accumulated result.
     */
    function reduce(array, callback) {
      var accumulator = null;
      each(array, function(value, index) {
        accumulator = callback(accumulator, value, index, array);
      });
      return accumulator;
    }
  
    /**
     * Removes leading and trailing whitespace from a string.
     *
     * @private
     * @param {string} string The string to trim.
     * @returns {string} The trimmed string.
     */
    function trim(string) {
      return String(string).replace(/^ +| +$/g, '');
    }
  
    /*--------------------------------------------------------------------------*/
  
    /**
     * Creates a new platform object.
     *
     * @memberOf platform
     * @param {Object|string} [ua=navigator.userAgent] The user agent string or
     *  context object.
     * @returns {Object} A platform object.
     */
    function parse(ua) {
  
      /** The environment context object. */
      var context = root;
  
      /** Used to flag when a custom context is provided. */
      var isCustomContext = ua && typeof ua == 'object' && getClassOf(ua) != 'String';
  
      // Juggle arguments.
      if (isCustomContext) {
        context = ua;
        ua = null;
      }
  
      /** Browser navigator object. */
      var nav = context.navigator || {};
  
      /** Browser user agent string. */
      var userAgent = nav.userAgent || '';
  
      ua || (ua = userAgent);
  
      /** Used to flag when `thisBinding` is the [ModuleScope]. */
      var isModuleScope = isCustomContext || thisBinding == oldRoot;
  
      /** Used to detect if browser is like Chrome. */
      var likeChrome = isCustomContext
        ? !!nav.likeChrome
        : /\bChrome\b/.test(ua) && !/internal|\n/i.test(toString.toString());
  
      /** Internal `[[Class]]` value shortcuts. */
      var objectClass = 'Object',
          airRuntimeClass = isCustomContext ? objectClass : 'ScriptBridgingProxyObject',
          enviroClass = isCustomContext ? objectClass : 'Environment',
          javaClass = (isCustomContext && context.java) ? 'JavaPackage' : getClassOf(context.java),
          phantomClass = isCustomContext ? objectClass : 'RuntimeObject';
  
      /** Detect Java environments. */
      var java = /\bJava/.test(javaClass) && context.java;
  
      /** Detect Rhino. */
      var rhino = java && getClassOf(context.environment) == enviroClass;
  
      /** A character to represent alpha. */
      var alpha = java ? 'a' : '\u03b1';
  
      /** A character to represent beta. */
      var beta = java ? 'b' : '\u03b2';
  
      /** Browser document object. */
      var doc = context.document || {};
  
      /**
       * Detect Opera browser (Presto-based).
       * http://www.howtocreate.co.uk/operaStuff/operaObject.html
       * http://dev.opera.com/articles/view/opera-mini-web-content-authoring-guidelines/#operamini
       */
      var opera = context.operamini || context.opera;
  
      /** Opera `[[Class]]`. */
      var operaClass = reOpera.test(operaClass = (isCustomContext && opera) ? opera['[[Class]]'] : getClassOf(opera))
        ? operaClass
        : (opera = null);
  
      /*------------------------------------------------------------------------*/
  
      /** Temporary variable used over the script's lifetime. */
      var data;
  
      /** The CPU architecture. */
      var arch = ua;
  
      /** Platform description array. */
      var description = [];
  
      /** Platform alpha/beta indicator. */
      var prerelease = null;
  
      /** A flag to indicate that environment features should be used to resolve the platform. */
      var useFeatures = ua == userAgent;
  
      /** The browser/environment version. */
      var version = useFeatures && opera && typeof opera.version == 'function' && opera.version();
  
      /** A flag to indicate if the OS ends with "/ Version" */
      var isSpecialCasedOS;
  
      /* Detectable layout engines (order is important). */
      var layout = getLayout([
        { 'label': 'EdgeHTML', 'pattern': 'Edge' },
        'Trident',
        { 'label': 'WebKit', 'pattern': 'AppleWebKit' },
        'iCab',
        'Presto',
        'NetFront',
        'Tasman',
        'KHTML',
        'Gecko'
      ]);
  
      /* Detectable browser names (order is important). */
      var name = getName([
        'Adobe AIR',
        'Arora',
        'Avant Browser',
        'Breach',
        'Camino',
        'Electron',
        'Epiphany',
        'Fennec',
        'Flock',
        'Galeon',
        'GreenBrowser',
        'iCab',
        'Iceweasel',
        'K-Meleon',
        'Konqueror',
        'Lunascape',
        'Maxthon',
        { 'label': 'Microsoft Edge', 'pattern': 'Edge' },
        'Midori',
        'Nook Browser',
        'PaleMoon',
        'PhantomJS',
        'Raven',
        'Rekonq',
        'RockMelt',
        { 'label': 'Samsung Internet', 'pattern': 'SamsungBrowser' },
        'SeaMonkey',
        { 'label': 'Silk', 'pattern': '(?:Cloud9|Silk-Accelerated)' },
        'Sleipnir',
        'SlimBrowser',
        { 'label': 'SRWare Iron', 'pattern': 'Iron' },
        'Sunrise',
        'Swiftfox',
        'Waterfox',
        'WebPositive',
        'Opera Mini',
        { 'label': 'Opera Mini', 'pattern': 'OPiOS' },
        'Opera',
        { 'label': 'Opera', 'pattern': 'OPR' },
        'Chrome',
        { 'label': 'Chrome Mobile', 'pattern': '(?:CriOS|CrMo)' },
        { 'label': 'Firefox', 'pattern': '(?:Firefox|Minefield)' },
        { 'label': 'Firefox for iOS', 'pattern': 'FxiOS' },
        { 'label': 'IE', 'pattern': 'IEMobile' },
        { 'label': 'IE', 'pattern': 'MSIE' },
        'Safari'
      ]);
  
      /* Detectable products (order is important). */
      var product = getProduct([
        { 'label': 'BlackBerry', 'pattern': 'BB10' },
        'BlackBerry',
        { 'label': 'Galaxy S', 'pattern': 'GT-I9000' },
        { 'label': 'Galaxy S2', 'pattern': 'GT-I9100' },
        { 'label': 'Galaxy S3', 'pattern': 'GT-I9300' },
        { 'label': 'Galaxy S4', 'pattern': 'GT-I9500' },
        { 'label': 'Galaxy S5', 'pattern': 'SM-G900' },
        { 'label': 'Galaxy S6', 'pattern': 'SM-G920' },
        { 'label': 'Galaxy S6 Edge', 'pattern': 'SM-G925' },
        { 'label': 'Galaxy S7', 'pattern': 'SM-G930' },
        { 'label': 'Galaxy S7 Edge', 'pattern': 'SM-G935' },
        'Google TV',
        'Lumia',
        'iPad',
        'iPod',
        'iPhone',
        'Kindle',
        { 'label': 'Kindle Fire', 'pattern': '(?:Cloud9|Silk-Accelerated)' },
        'Nexus',
        'Nook',
        'PlayBook',
        'PlayStation Vita',
        'PlayStation',
        'TouchPad',
        'Transformer',
        { 'label': 'Wii U', 'pattern': 'WiiU' },
        'Wii',
        'Xbox One',
        { 'label': 'Xbox 360', 'pattern': 'Xbox' },
        'Xoom'
      ]);
  
      /* Detectable manufacturers. */
      var manufacturer = getManufacturer({
        'Apple': { 'iPad': 1, 'iPhone': 1, 'iPod': 1 },
        'Archos': {},
        'Amazon': { 'Kindle': 1, 'Kindle Fire': 1 },
        'Asus': { 'Transformer': 1 },
        'Barnes & Noble': { 'Nook': 1 },
        'BlackBerry': { 'PlayBook': 1 },
        'Google': { 'Google TV': 1, 'Nexus': 1 },
        'HP': { 'TouchPad': 1 },
        'HTC': {},
        'LG': {},
        'Microsoft': { 'Xbox': 1, 'Xbox One': 1 },
        'Motorola': { 'Xoom': 1 },
        'Nintendo': { 'Wii U': 1,  'Wii': 1 },
        'Nokia': { 'Lumia': 1 },
        'Samsung': { 'Galaxy S': 1, 'Galaxy S2': 1, 'Galaxy S3': 1, 'Galaxy S4': 1 },
        'Sony': { 'PlayStation': 1, 'PlayStation Vita': 1 }
      });
  
      /* Detectable operating systems (order is important). */
      var os = getOS([
        'Windows Phone',
        'Android',
        'CentOS',
        { 'label': 'Chrome OS', 'pattern': 'CrOS' },
        'Debian',
        'Fedora',
        'FreeBSD',
        'Gentoo',
        'Haiku',
        'Kubuntu',
        'Linux Mint',
        'OpenBSD',
        'Red Hat',
        'SuSE',
        'Ubuntu',
        'Xubuntu',
        'Cygwin',
        'Symbian OS',
        'hpwOS',
        'webOS ',
        'webOS',
        'Tablet OS',
        'Tizen',
        'Linux',
        'Mac OS X',
        'Macintosh',
        'Mac',
        'Windows 98;',
        'Windows '
      ]);
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Picks the layout engine from an array of guesses.
       *
       * @private
       * @param {Array} guesses An array of guesses.
       * @returns {null|string} The detected layout engine.
       */
      function getLayout(guesses) {
        return reduce(guesses, function(result, guess) {
          return result || RegExp('\\b' + (
            guess.pattern || qualify(guess)
          ) + '\\b', 'i').exec(ua) && (guess.label || guess);
        });
      }
  
      /**
       * Picks the manufacturer from an array of guesses.
       *
       * @private
       * @param {Array} guesses An object of guesses.
       * @returns {null|string} The detected manufacturer.
       */
      function getManufacturer(guesses) {
        return reduce(guesses, function(result, value, key) {
          // Lookup the manufacturer by product or scan the UA for the manufacturer.
          return result || (
            value[product] ||
            value[/^[a-z]+(?: +[a-z]+\b)*/i.exec(product)] ||
            RegExp('\\b' + qualify(key) + '(?:\\b|\\w*\\d)', 'i').exec(ua)
          ) && key;
        });
      }
  
      /**
       * Picks the browser name from an array of guesses.
       *
       * @private
       * @param {Array} guesses An array of guesses.
       * @returns {null|string} The detected browser name.
       */
      function getName(guesses) {
        return reduce(guesses, function(result, guess) {
          return result || RegExp('\\b' + (
            guess.pattern || qualify(guess)
          ) + '\\b', 'i').exec(ua) && (guess.label || guess);
        });
      }
  
      /**
       * Picks the OS name from an array of guesses.
       *
       * @private
       * @param {Array} guesses An array of guesses.
       * @returns {null|string} The detected OS name.
       */
      function getOS(guesses) {
        return reduce(guesses, function(result, guess) {
          var pattern = guess.pattern || qualify(guess);
          if (!result && (result =
                RegExp('\\b' + pattern + '(?:/[\\d.]+|[ \\w.]*)', 'i').exec(ua)
              )) {
            result = cleanupOS(result, pattern, guess.label || guess);
          }
          return result;
        });
      }
  
      /**
       * Picks the product name from an array of guesses.
       *
       * @private
       * @param {Array} guesses An array of guesses.
       * @returns {null|string} The detected product name.
       */
      function getProduct(guesses) {
        return reduce(guesses, function(result, guess) {
          var pattern = guess.pattern || qualify(guess);
          if (!result && (result =
                RegExp('\\b' + pattern + ' *\\d+[.\\w_]*', 'i').exec(ua) ||
                RegExp('\\b' + pattern + ' *\\w+-[\\w]*', 'i').exec(ua) ||
                RegExp('\\b' + pattern + '(?:; *(?:[a-z]+[_-])?[a-z]+\\d+|[^ ();-]*)', 'i').exec(ua)
              )) {
            // Split by forward slash and append product version if needed.
            if ((result = String((guess.label && !RegExp(pattern, 'i').test(guess.label)) ? guess.label : result).split('/'))[1] && !/[\d.]+/.test(result[0])) {
              result[0] += ' ' + result[1];
            }
            // Correct character case and cleanup string.
            guess = guess.label || guess;
            result = format(result[0]
              .replace(RegExp(pattern, 'i'), guess)
              .replace(RegExp('; *(?:' + guess + '[_-])?', 'i'), ' ')
              .replace(RegExp('(' + guess + ')[-_.]?(\\w)', 'i'), '$1 $2'));
          }
          return result;
        });
      }
  
      /**
       * Resolves the version using an array of UA patterns.
       *
       * @private
       * @param {Array} patterns An array of UA patterns.
       * @returns {null|string} The detected version.
       */
      function getVersion(patterns) {
        return reduce(patterns, function(result, pattern) {
          return result || (RegExp(pattern +
            '(?:-[\\d.]+/|(?: for [\\w-]+)?[ /-])([\\d.]+[^ ();/_-]*)', 'i').exec(ua) || 0)[1] || null;
        });
      }
  
      /**
       * Returns `platform.description` when the platform object is coerced to a string.
       *
       * @name toString
       * @memberOf platform
       * @returns {string} Returns `platform.description` if available, else an empty string.
       */
      function toStringPlatform() {
        return this.description || '';
      }
  
      /*------------------------------------------------------------------------*/
  
      // Convert layout to an array so we can add extra details.
      layout && (layout = [layout]);
  
      // Detect product names that contain their manufacturer's name.
      if (manufacturer && !product) {
        product = getProduct([manufacturer]);
      }
      // Clean up Google TV.
      if ((data = /\bGoogle TV\b/.exec(product))) {
        product = data[0];
      }
      // Detect simulators.
      if (/\bSimulator\b/i.test(ua)) {
        product = (product ? product + ' ' : '') + 'Simulator';
      }
      // Detect Opera Mini 8+ running in Turbo/Uncompressed mode on iOS.
      if (name == 'Opera Mini' && /\bOPiOS\b/.test(ua)) {
        description.push('running in Turbo/Uncompressed mode');
      }
      // Detect IE Mobile 11.
      if (name == 'IE' && /\blike iPhone OS\b/.test(ua)) {
        data = parse(ua.replace(/like iPhone OS/, ''));
        manufacturer = data.manufacturer;
        product = data.product;
      }
      // Detect iOS.
      else if (/^iP/.test(product)) {
        name || (name = 'Safari');
        os = 'iOS' + ((data = / OS ([\d_]+)/i.exec(ua))
          ? ' ' + data[1].replace(/_/g, '.')
          : '');
      }
      // Detect Kubuntu.
      else if (name == 'Konqueror' && !/buntu/i.test(os)) {
        os = 'Kubuntu';
      }
      // Detect Android browsers.
      else if ((manufacturer && manufacturer != 'Google' &&
          ((/Chrome/.test(name) && !/\bMobile Safari\b/i.test(ua)) || /\bVita\b/.test(product))) ||
          (/\bAndroid\b/.test(os) && /^Chrome/.test(name) && /\bVersion\//i.test(ua))) {
        name = 'Android Browser';
        os = /\bAndroid\b/.test(os) ? os : 'Android';
      }
      // Detect Silk desktop/accelerated modes.
      else if (name == 'Silk') {
        if (!/\bMobi/i.test(ua)) {
          os = 'Android';
          description.unshift('desktop mode');
        }
        if (/Accelerated *= *true/i.test(ua)) {
          description.unshift('accelerated');
        }
      }
      // Detect PaleMoon identifying as Firefox.
      else if (name == 'PaleMoon' && (data = /\bFirefox\/([\d.]+)\b/.exec(ua))) {
        description.push('identifying as Firefox ' + data[1]);
      }
      // Detect Firefox OS and products running Firefox.
      else if (name == 'Firefox' && (data = /\b(Mobile|Tablet|TV)\b/i.exec(ua))) {
        os || (os = 'Firefox OS');
        product || (product = data[1]);
      }
      // Detect false positives for Firefox/Safari.
      else if (!name || (data = !/\bMinefield\b/i.test(ua) && /\b(?:Firefox|Safari)\b/.exec(name))) {
        // Escape the `/` for Firefox 1.
        if (name && !product && /[\/,]|^[^(]+?\)/.test(ua.slice(ua.indexOf(data + '/') + 8))) {
          // Clear name of false positives.
          name = null;
        }
        // Reassign a generic name.
        if ((data = product || manufacturer || os) &&
            (product || manufacturer || /\b(?:Android|Symbian OS|Tablet OS|webOS)\b/.test(os))) {
          name = /[a-z]+(?: Hat)?/i.exec(/\bAndroid\b/.test(os) ? os : data) + ' Browser';
        }
      }
      // Add Chrome version to description for Electron.
      else if (name == 'Electron' && (data = (/\bChrome\/([\d.]+)\b/.exec(ua) || 0)[1])) {
        description.push('Chromium ' + data);
      }
      // Detect non-Opera (Presto-based) versions (order is important).
      if (!version) {
        version = getVersion([
          '(?:Cloud9|CriOS|CrMo|Edge|FxiOS|IEMobile|Iron|Opera ?Mini|OPiOS|OPR|Raven|SamsungBrowser|Silk(?!/[\\d.]+$))',
          'Version',
          qualify(name),
          '(?:Firefox|Minefield|NetFront)'
        ]);
      }
      // Detect stubborn layout engines.
      if ((data =
            layout == 'iCab' && parseFloat(version) > 3 && 'WebKit' ||
            /\bOpera\b/.test(name) && (/\bOPR\b/.test(ua) ? 'Blink' : 'Presto') ||
            /\b(?:Midori|Nook|Safari)\b/i.test(ua) && !/^(?:Trident|EdgeHTML)$/.test(layout) && 'WebKit' ||
            !layout && /\bMSIE\b/i.test(ua) && (os == 'Mac OS' ? 'Tasman' : 'Trident') ||
            layout == 'WebKit' && /\bPlayStation\b(?! Vita\b)/i.test(name) && 'NetFront'
          )) {
        layout = [data];
      }
      // Detect Windows Phone 7 desktop mode.
      if (name == 'IE' && (data = (/; *(?:XBLWP|ZuneWP)(\d+)/i.exec(ua) || 0)[1])) {
        name += ' Mobile';
        os = 'Windows Phone ' + (/\+$/.test(data) ? data : data + '.x');
        description.unshift('desktop mode');
      }
      // Detect Windows Phone 8.x desktop mode.
      else if (/\bWPDesktop\b/i.test(ua)) {
        name = 'IE Mobile';
        os = 'Windows Phone 8.x';
        description.unshift('desktop mode');
        version || (version = (/\brv:([\d.]+)/.exec(ua) || 0)[1]);
      }
      // Detect IE 11 identifying as other browsers.
      else if (name != 'IE' && layout == 'Trident' && (data = /\brv:([\d.]+)/.exec(ua))) {
        if (name) {
          description.push('identifying as ' + name + (version ? ' ' + version : ''));
        }
        name = 'IE';
        version = data[1];
      }
      // Leverage environment features.
      if (useFeatures) {
        // Detect server-side environments.
        // Rhino has a global function while others have a global object.
        if (isHostType(context, 'global')) {
          if (java) {
            data = java.lang.System;
            arch = data.getProperty('os.arch');
            os = os || data.getProperty('os.name') + ' ' + data.getProperty('os.version');
          }
          if (rhino) {
            try {
              version = context.require('ringo/engine').version.join('.');
              name = 'RingoJS';
            } catch(e) {
              if ((data = context.system) && data.global.system == context.system) {
                name = 'Narwhal';
                os || (os = data[0].os || null);
              }
            }
            if (!name) {
              name = 'Rhino';
            }
          }
          else if (
            typeof context.process == 'object' && !context.process.browser &&
            (data = context.process)
          ) {
            if (typeof data.versions == 'object') {
              if (typeof data.versions.electron == 'string') {
                description.push('Node ' + data.versions.node);
                name = 'Electron';
                version = data.versions.electron;
              } else if (typeof data.versions.nw == 'string') {
                description.push('Chromium ' + version, 'Node ' + data.versions.node);
                name = 'NW.js';
                version = data.versions.nw;
              }
            }
            if (!name) {
              name = 'Node.js';
              arch = data.arch;
              os = data.platform;
              version = /[\d.]+/.exec(data.version);
              version = version ? version[0] : null;
            }
          }
        }
        // Detect Adobe AIR.
        else if (getClassOf((data = context.runtime)) == airRuntimeClass) {
          name = 'Adobe AIR';
          os = data.flash.system.Capabilities.os;
        }
        // Detect PhantomJS.
        else if (getClassOf((data = context.phantom)) == phantomClass) {
          name = 'PhantomJS';
          version = (data = data.version || null) && (data.major + '.' + data.minor + '.' + data.patch);
        }
        // Detect IE compatibility modes.
        else if (typeof doc.documentMode == 'number' && (data = /\bTrident\/(\d+)/i.exec(ua))) {
          // We're in compatibility mode when the Trident version + 4 doesn't
          // equal the document mode.
          version = [version, doc.documentMode];
          if ((data = +data[1] + 4) != version[1]) {
            description.push('IE ' + version[1] + ' mode');
            layout && (layout[1] = '');
            version[1] = data;
          }
          version = name == 'IE' ? String(version[1].toFixed(1)) : version[0];
        }
        // Detect IE 11 masking as other browsers.
        else if (typeof doc.documentMode == 'number' && /^(?:Chrome|Firefox)\b/.test(name)) {
          description.push('masking as ' + name + ' ' + version);
          name = 'IE';
          version = '11.0';
          layout = ['Trident'];
          os = 'Windows';
        }
        os = os && format(os);
      }
      // Detect prerelease phases.
      if (version && (data =
            /(?:[ab]|dp|pre|[ab]\d+pre)(?:\d+\+?)?$/i.exec(version) ||
            /(?:alpha|beta)(?: ?\d)?/i.exec(ua + ';' + (useFeatures && nav.appMinorVersion)) ||
            /\bMinefield\b/i.test(ua) && 'a'
          )) {
        prerelease = /b/i.test(data) ? 'beta' : 'alpha';
        version = version.replace(RegExp(data + '\\+?$'), '') +
          (prerelease == 'beta' ? beta : alpha) + (/\d+\+?/.exec(data) || '');
      }
      // Detect Firefox Mobile.
      if (name == 'Fennec' || name == 'Firefox' && /\b(?:Android|Firefox OS)\b/.test(os)) {
        name = 'Firefox Mobile';
      }
      // Obscure Maxthon's unreliable version.
      else if (name == 'Maxthon' && version) {
        version = version.replace(/\.[\d.]+/, '.x');
      }
      // Detect Xbox 360 and Xbox One.
      else if (/\bXbox\b/i.test(product)) {
        if (product == 'Xbox 360') {
          os = null;
        }
        if (product == 'Xbox 360' && /\bIEMobile\b/.test(ua)) {
          description.unshift('mobile mode');
        }
      }
      // Add mobile postfix.
      else if ((/^(?:Chrome|IE|Opera)$/.test(name) || name && !product && !/Browser|Mobi/.test(name)) &&
          (os == 'Windows CE' || /Mobi/i.test(ua))) {
        name += ' Mobile';
      }
      // Detect IE platform preview.
      else if (name == 'IE' && useFeatures) {
        try {
          if (context.external === null) {
            description.unshift('platform preview');
          }
        } catch(e) {
          description.unshift('embedded');
        }
      }
      // Detect BlackBerry OS version.
      // http://docs.blackberry.com/en/developers/deliverables/18169/HTTP_headers_sent_by_BB_Browser_1234911_11.jsp
      else if ((/\bBlackBerry\b/.test(product) || /\bBB10\b/.test(ua)) && (data =
            (RegExp(product.replace(/ +/g, ' *') + '/([.\\d]+)', 'i').exec(ua) || 0)[1] ||
            version
          )) {
        data = [data, /BB10/.test(ua)];
        os = (data[1] ? (product = null, manufacturer = 'BlackBerry') : 'Device Software') + ' ' + data[0];
        version = null;
      }
      // Detect Opera identifying/masking itself as another browser.
      // http://www.opera.com/support/kb/view/843/
      else if (this != forOwn && product != 'Wii' && (
            (useFeatures && opera) ||
            (/Opera/.test(name) && /\b(?:MSIE|Firefox)\b/i.test(ua)) ||
            (name == 'Firefox' && /\bOS X (?:\d+\.){2,}/.test(os)) ||
            (name == 'IE' && (
              (os && !/^Win/.test(os) && version > 5.5) ||
              /\bWindows XP\b/.test(os) && version > 8 ||
              version == 8 && !/\bTrident\b/.test(ua)
            ))
          ) && !reOpera.test((data = parse.call(forOwn, ua.replace(reOpera, '') + ';'))) && data.name) {
        // When "identifying", the UA contains both Opera and the other browser's name.
        data = 'ing as ' + data.name + ((data = data.version) ? ' ' + data : '');
        if (reOpera.test(name)) {
          if (/\bIE\b/.test(data) && os == 'Mac OS') {
            os = null;
          }
          data = 'identify' + data;
        }
        // When "masking", the UA contains only the other browser's name.
        else {
          data = 'mask' + data;
          if (operaClass) {
            name = format(operaClass.replace(/([a-z])([A-Z])/g, '$1 $2'));
          } else {
            name = 'Opera';
          }
          if (/\bIE\b/.test(data)) {
            os = null;
          }
          if (!useFeatures) {
            version = null;
          }
        }
        layout = ['Presto'];
        description.push(data);
      }
      // Detect WebKit Nightly and approximate Chrome/Safari versions.
      if ((data = (/\bAppleWebKit\/([\d.]+\+?)/i.exec(ua) || 0)[1])) {
        // Correct build number for numeric comparison.
        // (e.g. "532.5" becomes "532.05")
        data = [parseFloat(data.replace(/\.(\d)$/, '.0$1')), data];
        // Nightly builds are postfixed with a "+".
        if (name == 'Safari' && data[1].slice(-1) == '+') {
          name = 'WebKit Nightly';
          prerelease = 'alpha';
          version = data[1].slice(0, -1);
        }
        // Clear incorrect browser versions.
        else if (version == data[1] ||
            version == (data[2] = (/\bSafari\/([\d.]+\+?)/i.exec(ua) || 0)[1])) {
          version = null;
        }
        // Use the full Chrome version when available.
        data[1] = (/\bChrome\/([\d.]+)/i.exec(ua) || 0)[1];
        // Detect Blink layout engine.
        if (data[0] == 537.36 && data[2] == 537.36 && parseFloat(data[1]) >= 28 && layout == 'WebKit') {
          layout = ['Blink'];
        }
        // Detect JavaScriptCore.
        // http://stackoverflow.com/questions/6768474/how-can-i-detect-which-javascript-engine-v8-or-jsc-is-used-at-runtime-in-androi
        if (!useFeatures || (!likeChrome && !data[1])) {
          layout && (layout[1] = 'like Safari');
          data = (data = data[0], data < 400 ? 1 : data < 500 ? 2 : data < 526 ? 3 : data < 533 ? 4 : data < 534 ? '4+' : data < 535 ? 5 : data < 537 ? 6 : data < 538 ? 7 : data < 601 ? 8 : '8');
        } else {
          layout && (layout[1] = 'like Chrome');
          data = data[1] || (data = data[0], data < 530 ? 1 : data < 532 ? 2 : data < 532.05 ? 3 : data < 533 ? 4 : data < 534.03 ? 5 : data < 534.07 ? 6 : data < 534.10 ? 7 : data < 534.13 ? 8 : data < 534.16 ? 9 : data < 534.24 ? 10 : data < 534.30 ? 11 : data < 535.01 ? 12 : data < 535.02 ? '13+' : data < 535.07 ? 15 : data < 535.11 ? 16 : data < 535.19 ? 17 : data < 536.05 ? 18 : data < 536.10 ? 19 : data < 537.01 ? 20 : data < 537.11 ? '21+' : data < 537.13 ? 23 : data < 537.18 ? 24 : data < 537.24 ? 25 : data < 537.36 ? 26 : layout != 'Blink' ? '27' : '28');
        }
        // Add the postfix of ".x" or "+" for approximate versions.
        layout && (layout[1] += ' ' + (data += typeof data == 'number' ? '.x' : /[.+]/.test(data) ? '' : '+'));
        // Obscure version for some Safari 1-2 releases.
        if (name == 'Safari' && (!version || parseInt(version) > 45)) {
          version = data;
        }
      }
      // Detect Opera desktop modes.
      if (name == 'Opera' &&  (data = /\bzbov|zvav$/.exec(os))) {
        name += ' ';
        description.unshift('desktop mode');
        if (data == 'zvav') {
          name += 'Mini';
          version = null;
        } else {
          name += 'Mobile';
        }
        os = os.replace(RegExp(' *' + data + '$'), '');
      }
      // Detect Chrome desktop mode.
      else if (name == 'Safari' && /\bChrome\b/.exec(layout && layout[1])) {
        description.unshift('desktop mode');
        name = 'Chrome Mobile';
        version = null;
  
        if (/\bOS X\b/.test(os)) {
          manufacturer = 'Apple';
          os = 'iOS 4.3+';
        } else {
          os = null;
        }
      }
      // Strip incorrect OS versions.
      if (version && version.indexOf((data = /[\d.]+$/.exec(os))) == 0 &&
          ua.indexOf('/' + data + '-') > -1) {
        os = trim(os.replace(data, ''));
      }
      // Add layout engine.
      if (layout && !/\b(?:Avant|Nook)\b/.test(name) && (
          /Browser|Lunascape|Maxthon/.test(name) ||
          name != 'Safari' && /^iOS/.test(os) && /\bSafari\b/.test(layout[1]) ||
          /^(?:Adobe|Arora|Breach|Midori|Opera|Phantom|Rekonq|Rock|Samsung Internet|Sleipnir|Web)/.test(name) && layout[1])) {
        // Don't add layout details to description if they are falsey.
        (data = layout[layout.length - 1]) && description.push(data);
      }
      // Combine contextual information.
      if (description.length) {
        description = ['(' + description.join('; ') + ')'];
      }
      // Append manufacturer to description.
      if (manufacturer && product && product.indexOf(manufacturer) < 0) {
        description.push('on ' + manufacturer);
      }
      // Append product to description.
      if (product) {
        description.push((/^on /.test(description[description.length - 1]) ? '' : 'on ') + product);
      }
      // Parse the OS into an object.
      if (os) {
        data = / ([\d.+]+)$/.exec(os);
        isSpecialCasedOS = data && os.charAt(os.length - data[0].length - 1) == '/';
        os = {
          'architecture': 32,
          'family': (data && !isSpecialCasedOS) ? os.replace(data[0], '') : os,
          'version': data ? data[1] : null,
          'toString': function() {
            var version = this.version;
            return this.family + ((version && !isSpecialCasedOS) ? ' ' + version : '') + (this.architecture == 64 ? ' 64-bit' : '');
          }
        };
      }
      // Add browser/OS architecture.
      if ((data = /\b(?:AMD|IA|Win|WOW|x86_|x)64\b/i.exec(arch)) && !/\bi686\b/i.test(arch)) {
        if (os) {
          os.architecture = 64;
          os.family = os.family.replace(RegExp(' *' + data), '');
        }
        if (
            name && (/\bWOW64\b/i.test(ua) ||
            (useFeatures && /\w(?:86|32)$/.test(nav.cpuClass || nav.platform) && !/\bWin64; x64\b/i.test(ua)))
        ) {
          description.unshift('32-bit');
        }
      }
      // Chrome 39 and above on OS X is always 64-bit.
      else if (
          os && /^OS X/.test(os.family) &&
          name == 'Chrome' && parseFloat(version) >= 39
      ) {
        os.architecture = 64;
      }
  
      ua || (ua = null);
  
      /*------------------------------------------------------------------------*/
  
      /**
       * The platform object.
       *
       * @name platform
       * @type Object
       */
      var platform = {};
  
      /**
       * The platform description.
       *
       * @memberOf platform
       * @type string|null
       */
      platform.description = ua;
  
      /**
       * The name of the browser's layout engine.
       *
       * The list of common layout engines include:
       * "Blink", "EdgeHTML", "Gecko", "Trident" and "WebKit"
       *
       * @memberOf platform
       * @type string|null
       */
      platform.layout = layout && layout[0];
  
      /**
       * The name of the product's manufacturer.
       *
       * The list of manufacturers include:
       * "Apple", "Archos", "Amazon", "Asus", "Barnes & Noble", "BlackBerry",
       * "Google", "HP", "HTC", "LG", "Microsoft", "Motorola", "Nintendo",
       * "Nokia", "Samsung" and "Sony"
       *
       * @memberOf platform
       * @type string|null
       */
      platform.manufacturer = manufacturer;
  
      /**
       * The name of the browser/environment.
       *
       * The list of common browser names include:
       * "Chrome", "Electron", "Firefox", "Firefox for iOS", "IE",
       * "Microsoft Edge", "PhantomJS", "Safari", "SeaMonkey", "Silk",
       * "Opera Mini" and "Opera"
       *
       * Mobile versions of some browsers have "Mobile" appended to their name:
       * eg. "Chrome Mobile", "Firefox Mobile", "IE Mobile" and "Opera Mobile"
       *
       * @memberOf platform
       * @type string|null
       */
      platform.name = name;
  
      /**
       * The alpha/beta release indicator.
       *
       * @memberOf platform
       * @type string|null
       */
      platform.prerelease = prerelease;
  
      /**
       * The name of the product hosting the browser.
       *
       * The list of common products include:
       *
       * "BlackBerry", "Galaxy S4", "Lumia", "iPad", "iPod", "iPhone", "Kindle",
       * "Kindle Fire", "Nexus", "Nook", "PlayBook", "TouchPad" and "Transformer"
       *
       * @memberOf platform
       * @type string|null
       */
      platform.product = product;
  
      /**
       * The browser's user agent string.
       *
       * @memberOf platform
       * @type string|null
       */
      platform.ua = ua;
  
      /**
       * The browser/environment version.
       *
       * @memberOf platform
       * @type string|null
       */
      platform.version = name && version;
  
      /**
       * The name of the operating system.
       *
       * @memberOf platform
       * @type Object
       */
      platform.os = os || {
  
        /**
         * The CPU architecture the OS is built for.
         *
         * @memberOf platform.os
         * @type number|null
         */
        'architecture': null,
  
        /**
         * The family of the OS.
         *
         * Common values include:
         * "Windows", "Windows Server 2008 R2 / 7", "Windows Server 2008 / Vista",
         * "Windows XP", "OS X", "Ubuntu", "Debian", "Fedora", "Red Hat", "SuSE",
         * "Android", "iOS" and "Windows Phone"
         *
         * @memberOf platform.os
         * @type string|null
         */
        'family': null,
  
        /**
         * The version of the OS.
         *
         * @memberOf platform.os
         * @type string|null
         */
        'version': null,
  
        /**
         * Returns the OS string.
         *
         * @memberOf platform.os
         * @returns {string} The OS string.
         */
        'toString': function() { return 'null'; }
      };
  
      platform.parse = parse;
      platform.toString = toStringPlatform;
  
      if (platform.version) {
        description.unshift(version);
      }
      if (platform.name) {
        description.unshift(name);
      }
      if (os && name && !(os == String(os).split(' ')[0] && (os == name.split(' ')[0] || product))) {
        description.push(product ? '(' + os + ')' : 'on ' + os);
      }
      if (description.length) {
        platform.description = description.join(' ');
      }
      return platform;
    }
  
    /*--------------------------------------------------------------------------*/
  
    // Export platform.
    var platform = parse();
  
    // Some AMD build optimizers, like r.js, check for condition patterns like the following:
    if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) {
      // Expose platform on the global object to prevent errors when platform is
      // loaded by a script tag in the presence of an AMD loader.
      // See http://requirejs.org/docs/errors.html#mismatch for more details.
      root.platform = platform;
  
      // Define as an anonymous module so platform can be aliased through path mapping.
      define(function() {
        return platform;
      });
    }
    // Check for `exports` after `define` in case a build optimizer adds an `exports` object.
    else if (freeExports && freeModule) {
      // Export for CommonJS support.
      forOwn(platform, function(value, key) {
        freeExports[key] = value;
      });
    }
    else {
      // Export to the global object.
      root.platform = platform;
    }
  }.call(this));
  