useragent.js

// Based on fantastic jQuery useragent parser plugin https://gist.github.com/373298
function parse(uaStr) {
    var agent = {
        platform: {},
        browser: {},
        engine: {}
    };

    var ua = uaStr,
        p = agent.platform,
        b = agent.browser,
        e = agent.engine;

    // detect platform
    if (/Windows/.test(ua)) {
        p.name = 'win';
        p.win = true;
    } else if (/iPhone|iPod/.test(ua)) {
        p.name = 'iphone';
        p.iphone = true;
    } else if (/iPad/.test(ua)) {
        p.name = 'ipad';
        p.ipad = true;
    } else if (/Mac/.test(ua)) {
        p.name = 'mac';
        p.mac = true;
    } else if (/Linux/.test(ua)) {
        p.name = 'linux';
        p.linux = true;
    } else if (/Android/.test(ua)) {
        p.name = 'android';
        p.android = true;
    } else {
        p.name = 'other';
        p.unknown = true;
    }

    // detect browser
    if (/MSIE/.test(ua)) {
        b.name = 'msie';
        b.msie = true;
    } else if (/Firefox/.test(ua)) {
        b.name = 'firefox';
        b.firefox = true;
    } else if (/Chrome/.test(ua)) { // must be tested before Safari
        b.name = 'chrome';
        b.chrome = true;
    } else if (/Safari/.test(ua)) {
        b.name = 'safari';
        b.safari = true;
    } else if (/Opera/.test(ua)) {
        b.name = 'opera';
        b.opera = true;
    } else {
        b.name = 'other';
        b.unknown = true;
    }

    // detect browser version
    if (b.msie) {
        b.version = /MSIE (\d+(\.\d+)*)/.exec(ua)[1];
    } else if (b.firefox) {
        b.version = /Firefox\/(\d+(\.\d+)*)/.exec(ua)[1];
    } else if (b.chrome) {
        b.version = /Chrome\/(\d+(\.\d+)*)/.exec(ua)[1];
    } else if (b.safari) {
        b.version = /Version\/(\d+(\.\d+)*)/.exec(ua)[1];
    } else if (b.opera) {
        b.version = /Version\/(\d+(\.\d+)*)/.exec(ua)[1];
    } else {
        b.version = 0;
    }

    // detect engine
    if (/Trident/.test(ua) || b.msie) {
        e.name = 'trident';
        e.trident = true;
    } else if (/WebKit/.test(ua)) { // must be tested before Gecko
        e.name = 'webkit';
        e.webkit = true;
    } else if (/Gecko/.test(ua)) {
        e.name = 'gecko';
        e.gecko = true;
    } else if (/Presto/.test(ua)) {
        e.name = 'presto';
        e.presto = true;
    } else {
        e.name = 'other';
        e.unknown = true;
    }

    // detect engine version
    if (e.trident) {
        e.version = /Trident/.test(ua)? /Trident\/(\d+(\.\d+)*)/.exec(ua)[1]: 0;
    } else if (e.gecko) {
        e.version = /rv:(\d+(\.\d+)*)/.exec(ua)[1];
    } else if (e.webkit) {
        e.version = /WebKit\/(\d+(\.\d+)*)/.exec(ua)[1];
    } else if (e.presto) {
        e.version = /Presto\/(\d+(\.\d+)*)/.exec(ua)[1];
    } else {
        e.version = 0;
    }
    
    return agent;
};

exports.parse = parse;