# Source: lib/platform.js

    /**
     * Platform.js
     * Copyright 2014-2018 Benjamin Tan
     * Copyright 2011-2013 John-David Dalton
     * Available under MIT license
     * @namespace platform
     */
    ;(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|EdgA|EdgiOS)' },
          '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|EdgA|EdgiOS)' },
          '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|EdgA|EdgiOS|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.
         *
         * @memberof 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));