/*!
 * 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|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|Edg|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|Edg|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.
         *
         * @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));