Function returning a list of strings describing the current browser

gistfile1.js

var whichBrowser = function() {
  var ua = navigator.userAgent, p = {}, b = {}, e = {};

  // detect platform
  if (/Windows/.test(ua)) {
    p.name = 'win';
    p.win = 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 (/iPhone|iPod/.test(ua)) {
    p.name = 'iphone';
    p.iphone = true;
  } else if (/iPad/.test(ua)) {
    p.name = 'ipad';
    p.ipad = true;
  } else if (/Android/.test(ua)) {
    p.name = 'android';
    p.android = true;
  } else {
    p.name = 'unknown-platform';
    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 = 'unknown-browser';
    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 = 'unknown-engine';
    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;
  }

  // add classes to html element
  return [
    p.name,
    b.name,
    b.name + parseInt(b.version, 10),
    e.name,
    e.name + parseInt(e.version, 10)
  ];

};