(function () {
  'use strict';

  var matched, browser;

  matched = (function (ua) {
    ua = ua.toLowerCase();

    var match = /(chrome)[ \/]([\w.]+)/.exec(ua) ||
      /(webkit)[ \/]([\w.]+)/.exec(ua) ||
      /(opera)(?:.*version|)[ \/]([\w.]+)/.exec(ua) ||
      /(msie) ([\w.]+)/.exec(ua) ||
      (ua.indexOf("compatible") < 0 && /(mozilla)(?:.*? rv:([\w.]+)|)/.exec(ua)) ||
      [];

    return {
      browser: match[1] || "",
      version: match[2] || "0"
    };
  }(navigator.userAgent));

  browser = {};

  if (matched.browser) {
    browser[matched.browser] = true;
    browser.version = matched.version;
  }

  // Chrome is Webkit, but Webkit is also Safari.
  if (browser.chrome) {
    browser.webkit = true;
  } else if (browser.webkit) {
    browser.safari = true;
  }

  self.browser = browser;
} ());