function getBrowserInfo()

in tools/CCPConnectivityTestTools/scripts/detectRTC.js [91:190]
78 lines of code
18 McCabe index (conditional complexity)

    function getBrowserInfo() {
        var nVer = navigator.appVersion;
        var nAgt = navigator.userAgent;
        var browserName = navigator.appName;
        var fullVersion = '' + parseFloat(navigator.appVersion);
        var majorVersion = parseInt(navigator.appVersion, 10);
        var nameOffset, verOffset, ix;

        // both and safri and chrome has same userAgent
        if (isSafari && !isChrome && nAgt.indexOf('CriOS') !== -1) {
            isSafari = false;
            isChrome = true;
        }

        // In Opera, the true version is after 'Opera' or after 'Version'
        if (isOpera) {
            browserName = 'Opera';
            try {
                fullVersion = navigator.userAgent.split('OPR/')[1].split(' ')[0];
                majorVersion = fullVersion.split('.')[0];
            } catch (e) {
                fullVersion = '0.0.0.0';
                majorVersion = 0;
            }
        }
        // In MSIE version <=10, the true version is after 'MSIE' in userAgent
        // In IE 11, look for the string after 'rv:'
        else if (isIE) {
            verOffset = nAgt.indexOf('rv:');
            if (verOffset > 0) { //IE 11
                fullVersion = nAgt.substring(verOffset + 3);
            } else { //IE 10 or earlier
                verOffset = nAgt.indexOf('MSIE');
                fullVersion = nAgt.substring(verOffset + 5);
            }
            browserName = 'IE';
        }
        // In Chrome, the true version is after 'Chrome'
        else if (isChrome) {
            verOffset = nAgt.indexOf('Chrome');
            browserName = 'Chrome';
            fullVersion = nAgt.substring(verOffset + 7);
        }
        // In Safari, the true version is after 'Safari' or after 'Version'
        else if (isSafari) {
            verOffset = nAgt.indexOf('Safari');

            browserName = 'Safari';
            fullVersion = nAgt.substring(verOffset + 7);

            if ((verOffset = nAgt.indexOf('Version')) !== -1) {
                fullVersion = nAgt.substring(verOffset + 8);
            }

            if (navigator.userAgent.indexOf('Version/') !== -1) {
                fullVersion = navigator.userAgent.split('Version/')[1].split(' ')[0];
            }
        }
        // In Firefox, the true version is after 'Firefox'
        else if (isFirefox) {
            verOffset = nAgt.indexOf('Firefox');
            browserName = 'Firefox';
            fullVersion = nAgt.substring(verOffset + 8);
        }

        // In most other browsers, 'name/version' is at the end of userAgent
        else if ((nameOffset = nAgt.lastIndexOf(' ') + 1) < (verOffset = nAgt.lastIndexOf('/'))) {
            browserName = nAgt.substring(nameOffset, verOffset);
            fullVersion = nAgt.substring(verOffset + 1);

            if (browserName.toLowerCase() === browserName.toUpperCase()) {
                browserName = navigator.appName;
            }
        }

        if (isEdge) {
            browserName = 'Edge';
            fullVersion = navigator.userAgent.split('Edge/')[1];
            // fullVersion = parseInt(navigator.userAgent.match(/Edge\/(\d+).(\d+)$/)[2], 10).toString();
        }

        // trim the fullVersion string at semicolon/space/bracket if present
        if ((ix = fullVersion.search(/[; \)]/)) !== -1) {
            fullVersion = fullVersion.substring(0, ix);
        }

        majorVersion = parseInt('' + fullVersion, 10);

        if (isNaN(majorVersion)) {
            fullVersion = '' + parseFloat(navigator.appVersion);
            majorVersion = parseInt(navigator.appVersion, 10);
        }

        return {
            fullVersion: fullVersion,
            version: majorVersion,
            name: browserName,
            isPrivateBrowsing: false
        };
    }