source: Dev/trunk/src/client/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("msapp", parseFloat(dua.split("MSAppHost/")[1]) || undefined);
                has.add("khtml", dav.indexOf("Konqueror") >= 0 ? tv : undefined);
                has.add("webkit", parseFloat(dua.split("WebKit/")[1]) || undefined);
                has.add("chrome", parseFloat(dua.split("Chrome/")[1]) || undefined);
                has.add("safari", dav.indexOf("Safari")>=0 && !has("chrome") ? parseFloat(dav.split("Version/")[1]) : undefined);
                has.add("mac", dav.indexOf("Macintosh") >= 0);
                has.add("quirks", document.compatMode == "BackCompat");
                if(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("android", parseFloat(dua.split("Android ")[1]) || undefined);
                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("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;
});