/**
+ * The YUI module contains the components required for building the YUI seed file.
+ * This includes the script loading mechanism, a simple queue, and the core utilities for the library.
+ * @module yui
+ * @submodule yui-base
+ */
+
+/**
+ * YUI user agent detection.
+ * Do not fork for a browser if it can be avoided. Use feature detection when
+ * you can. Use the user agent as a last resort. UA stores a version
+ * number for the browser engine, 0 otherwise. This value may or may not map
+ * to the version number of the browser using the engine. The value is
+ * presented as a float so that it can easily be used for boolean evaluation
+ * as well as for looking for a particular range of versions. Because of this,
+ * some of the granularity of the version info may be lost (e.g., Gecko 1.8.0.9
+ * reports 1.8).
+ * @class UA
+ * @static
+ */
+Y.UA = function() {
+
+ var numberfy = function(s) {
+ var c = 0;
+ return parseFloat(s.replace(/\./g, function() {
+ return (c++ == 1) ? '' : '.';
+ }));
+ },
+
+ nav = navigator,
+
+ o = {
+
+ /**
+ * Internet Explorer version number or 0. Example: 6
+ * @property ie
+ * @type float
+ * @static
+ */
+ ie: 0,
+
+ /**
+ * Opera version number or 0. Example: 9.2
+ * @property opera
+ * @type float
+ * @static
+ */
+ opera: 0,
+
+ /**
+ * Gecko engine revision number. Will evaluate to 1 if Gecko
+ * is detected but the revision could not be found. Other browsers
+ * will be 0. Example: 1.8
+ * <pre>
+ * Firefox 1.0.0.4: 1.7.8 <-- Reports 1.7
+ * Firefox 1.5.0.9: 1.8.0.9 <-- Reports 1.8
+ * Firefox 2.0.0.3: 1.8.1.3 <-- Reports 1.8
+ * Firefox 3 alpha: 1.9a4 <-- Reports 1.9
+ * </pre>
+ * @property gecko
+ * @type float
+ * @static
+ */
+ gecko: 0,
+
+ /**
+ * AppleWebKit version. KHTML browsers that are not WebKit browsers
+ * will evaluate to 1, other browsers 0. Example: 418.9
+ * <pre>
+ * Safari 1.3.2 (312.6): 312.8.1 <-- Reports 312.8 -- currently the
+ * latest available for Mac OSX 10.3.
+ * Safari 2.0.2: 416 <-- hasOwnProperty introduced
+ * Safari 2.0.4: 418 <-- preventDefault fixed
+ * Safari 2.0.4 (419.3): 418.9.1 <-- One version of Safari may run
+ * different versions of webkit
+ * Safari 2.0.4 (419.3): 419 <-- Tiger installations that have been
+ * updated, but not updated
+ * to the latest patch.
+ * Webkit 212 nightly: 522+ <-- Safari 3.0 precursor (with native SVG
+ * and many major issues fixed).
+ * Safari 3.0.4 (523.12) 523.12 <-- First Tiger release - automatic update
+ * from 2.x via the 10.4.11 OS patch
+ * Webkit nightly 1/2008:525+ <-- Supports DOMContentLoaded event.
+ * yahoo.com user agent hack removed.
+ * </pre>
+ * http://en.wikipedia.org/wiki/Safari_(web_browser)#Version_history
+ * @property webkit
+ * @type float
+ * @static
+ */
+ webkit: 0,
+
+ /**
+ * The mobile property will be set to a string containing any relevant
+ * user agent information when a modern mobile browser is detected.
+ * Currently limited to Safari on the iPhone/iPod Touch, Nokia N-series
+ * devices with the WebKit-based browser, and Opera Mini.
+ * @property mobile
+ * @type string
+ * @static
+ */
+ mobile: null,
+
+ /**
+ * Adobe AIR version number or 0. Only populated if webkit is detected.
+ * Example: 1.0
+ * @property air
+ * @type float
+ */
+ air: 0,
+
+ /**
+ * Google Caja version number or 0.
+ * @property caja
+ * @type float
+ */
+ caja: nav.cajaVersion,
+
+ /**
+ * Set to true if the page appears to be in SSL
+ * @property secure
+ * @type boolean
+ * @static
+ */
+ secure: false,
+
+ /**
+ * The operating system. Currently only detecting windows or macintosh
+ * @property os
+ * @type string
+ * @static
+ */
+ os: null
+
+ },
+
+ ua = nav && nav.userAgent,
+
+ loc = Y.config.win.location,
+
+ href = loc && loc.href,
+
+ m;
+
+ o.secure = href && (href.toLowerCase().indexOf("https") === 0);
+
+ if (ua) {
+
+ if ((/windows|win32/i).test(ua)) {
+ o.os = 'windows';
+ } else if ((/macintosh/i).test(ua)) {
+ o.os = 'macintosh';
+ }
+
+ // Modern KHTML browsers should qualify as Safari X-Grade
+ if ((/KHTML/).test(ua)) {
+ o.webkit=1;
+ }
+ // Modern WebKit browsers are at least X-Grade
+ m=ua.match(/AppleWebKit\/([^\s]*)/);
+ if (m&&m[1]) {
+ o.webkit=numberfy(m[1]);
+
+ // Mobile browser check
+ if (/ Mobile\//.test(ua)) {
+ o.mobile = "Apple"; // iPhone or iPod Touch
+ } else {
+ m=ua.match(/NokiaN[^\/]*|Android \d\.\d|webOS\/\d\.\d/);
+ if (m) {
+ o.mobile = m[0]; // Nokia N-series, Android, webOS, ex: NokiaN95
+ }
+ }
+
+ m=ua.match(/AdobeAIR\/([^\s]*)/);
+ if (m) {
+ o.air = m[0]; // Adobe AIR 1.0 or better
+ }
+
+ }
+
+ if (!o.webkit) { // not webkit
+ // @todo check Opera/8.01 (J2ME/MIDP; Opera Mini/2.0.4509/1316; fi; U; ssr)
+ m=ua.match(/Opera[\s\/]([^\s]*)/);
+ if (m&&m[1]) {
+ o.opera=numberfy(m[1]);
+ m=ua.match(/Opera Mini[^;]*/);
+ if (m) {
+ o.mobile = m[0]; // ex: Opera Mini/2.0.4509/1316
+ }
+ } else { // not opera or webkit
+ m=ua.match(/MSIE\s([^;]*)/);
+ if (m&&m[1]) {
+ o.ie=numberfy(m[1]);
+ } else { // not opera, webkit, or ie
+ m=ua.match(/Gecko\/([^\s]*)/);
+ if (m) {
+ o.gecko=1; // Gecko detected, look for revision
+ m=ua.match(/rv:([^\s\)]*)/);
+ if (m&&m[1]) {
+ o.gecko=numberfy(m[1]);
+ }
+ }
+ }
+ }
+ }
+ }
+
+ return o;
+}();
+