dojo/sniff.js

define(["./has"], function(has){

    // module:

    //      dojo/sniff

    /*=====

    return function(){

        // summary:

        //      This module sets has() flags based on the current browser.

        //      It returns the has() function.

    };

    =====*/

    if(has("host-browser")){

        var n = navigator,

            dua = n.userAgent,

            dav = n.appVersion,

            tv = parseFloat(dav);

        has.add("air", dua.indexOf("AdobeAIR") >= 0);

        has.add("wp", parseFloat(dua.split("Windows Phone")[1]) || undefined);

        has.add("msapp", parseFloat(dua.split("MSAppHost/")[1]) || undefined);

        has.add("khtml", dav.indexOf("Konqueror") >= 0 ? tv : undefined);

        has.add("webkit", !has("wp") // NOTE: necessary since Windows Phone 8.1 Update 1, see #18540

                && parseFloat(dua.split("WebKit/")[1]) || undefined);

        has.add("chrome", parseFloat(dua.split("Chrome/")[1]) || undefined);

        has.add("android", !has("wp") // NOTE: necessary since Windows Phone 8.1 Update 1, see #18528

                && parseFloat(dua.split("Android ")[1]) || undefined);

        has.add("safari", dav.indexOf("Safari") >= 0 

                && !has("wp") // NOTE: necessary since Windows Phone 8.1 Update 1, see #18540

                && !has("chrome") && !has("android") ?

            parseFloat(dav.split("Version/")[1]) : undefined);

        has.add("mac", dav.indexOf("Macintosh") >= 0);

        has.add("quirks", document.compatMode == "BackCompat");

        if(!has("wp") // NOTE: necessary since Windows Phone 8.1 Update 1, see #18528

                && dua.match(/(iPhone|iPod|iPad)/)){

            var p = RegExp.$1.replace(/P/, "p");

            var v = dua.match(/OS ([\d_]+)/) ? RegExp.$1 : "1";

            var os = parseFloat(v.replace(/_/, ".").replace(/_/g, ""));

            has.add(p, os);     // "iphone", "ipad" or "ipod"

            has.add("ios", os);

        }

        has.add("bb", (dua.indexOf("BlackBerry") >= 0 || dua.indexOf("BB10") >= 0) && parseFloat(dua.split("Version/")[1]) || undefined);

        has.add("trident", parseFloat(dav.split("Trident/")[1]) || undefined);

        has.add("svg", typeof SVGAngle !== "undefined");

        if(!has("webkit")){

            // Opera

            if(dua.indexOf("Opera") >= 0){

                // see http://dev.opera.com/articles/view/opera-ua-string-changes and http://www.useragentstring.com/pages/Opera/

                // 9.8 has both styles; <9.8, 9.9 only old style

                has.add("opera", tv >= 9.8 ? parseFloat(dua.split("Version/")[1]) || tv : tv);

            }

            // Mozilla and firefox

            if(dua.indexOf("Gecko") >= 0 && !has("wp") // NOTE: necessary since Windows Phone 8.1 Update 1

                    && !has("khtml") && !has("webkit") && !has("trident")){

                has.add("mozilla", tv);

            }

            if(has("mozilla")){

                //We really need to get away from this. Consider a sane isGecko approach for the future.

                has.add("ff", parseFloat(dua.split("Firefox/")[1] || dua.split("Minefield/")[1]) || undefined);

            }

            // IE

            if(document.all && !has("opera")){

                var isIE = parseFloat(dav.split("MSIE ")[1]) || undefined;

                //In cases where the page has an HTTP header or META tag with

                //X-UA-Compatible, then it is in emulation mode.

                //Make sure isIE reflects the desired version.

                //document.documentMode of 5 means quirks mode.

                //Only switch the value if documentMode's major version

                //is different from isIE's major version.

                var mode = document.documentMode;

                if(mode && mode != 5 && Math.floor(isIE) != mode){

                    isIE = mode;

                }

                has.add("ie", isIE);

            }

            // Wii

            has.add("wii", typeof opera != "undefined" && opera.wiiremote);

        }

    }

    return has;

});