Editing Openai/691a9edc-b5b8-800a-99a3-c32d9abccf68 (section)

=== User: oh but you see, there is much more. ===
oh but you see, there is much more.

/**
 * A class for working with service workers
 * @class
 */
Q.ServiceWorker = {
	start: function(callback, options) {
		options = options || {};
		if (!('serviceWorker' in navigator)) {
			Q.handle(callback, null, [false]);
			Q.ServiceWorker.onActive.handle(false);
			return console.warn('Q.ServiceWorker.start: Service workers are not supported.');
		}
		var src = Q.info.serviceWorkerUrl;
		if (!src) {
			return callback(true);
		}
		Q.ServiceWorker.started = true;
		navigator.serviceWorker.getRegistration(src)
		.then(function (registration) {
			if (registration && registration.active
			&& (!Q.info || !Q.info.updateServiceWorker)) {
				// our latest worker is already active
				var worker = registration.active;
				Q.handle(callback, Q.ServiceWorker, [worker, registration]);
				Q.handle(Q.ServiceWorker.onActive, Q.ServiceWorker, [worker, registration]);
				return;
			}
			navigator.serviceWorker.register(src)
			.then(function (registration) {
				log("Q.ServiceWorker.register", registration);
				if (options.update) {
					registration.update();
				}
				registration.removeEventListener("updatefound", _onUpdateFound);
				registration.addEventListener("updatefound", _onUpdateFound);
				var worker;
				if (registration.active) {
					worker = registration.active;
				} else if (registration.waiting) {
					worker = registration.waiting;
				} else if (registration.installing) {
					worker = registration.installing;
				}
				if (worker) {
					Q.handle(callback, Q.ServiceWorker, [worker, registration]);
					Q.handle(Q.ServiceWorker.onActive, Q.ServiceWorker, [worker, registration]);
				}
			}).catch(function (error) {
				callback(error);
				console.warn("Q.ServiceWorker.start error", error);
			});
		});
		// Listen for cookie updates coming from the Service Worker
		navigator.serviceWorker.addEventListener('message', event => {
			const data = event.data || {};
			if (data.type === 'Q.cookie' && data.cookies) {
				for (const [k, v] of Object.entries(data.cookies)) {
					// Update document.cookie so future page requests carry it
					document.cookie = encodeURIComponent(k) + '=' + encodeURIComponent(v) + '; path=/';
					console.log('[SW] Updated cookie from service worker:', k);
				}
			}
		});
	}
}
try {
	Q.ServiceWorker.isSupported = !!navigator.serviceWorker;
} catch (e) {
	Q.ServiceWorker.isSupported = false;
}
Q.ServiceWorker.onActive = new Q.Event();
Q.ServiceWorker.onUpdateFound = new Q.Event();

function _onUpdateFound(event) {
	Q.handle(Q.ServiceWorker.onUpdateFound, Q.ServiceWorker, [event.target, event]);
}

function _startCachingWithServiceWorker() {
	if (!Q.ServiceWorker.isSupported || Q.ServiceWorker.skipCaching) {
		return false;
	}
	Q.ServiceWorker.start(function (worker, registration) {
		var items = [];
		var scripts = document.querySelectorAll("script[data-src]");
		var styles = document.querySelectorAll("style[data-href]");
		[scripts, styles].forEach(function (arr) {
			arr.forEach(function (element) {
				var content = element.innerText;
				var pathPrefix = element.getAttribute('data-path-prefix');
				if (pathPrefix) {
					var prefixes = ['@import ', '@import "', "@import '", 'url(', 'url("', "url('"];
					prefixes.forEach(function (prefix) {
						content = content.split(prefix + pathPrefix).join(prefix);
					});
				}
				items.push({
					url: element.getAttribute('data-src') || element.getAttribute('data-href'),
					content: content,
					headers: {
						'Content-Type': element.getAttribute('type')
					}
				});
			});
		});
		if (items.length) {
			worker.postMessage({
				type: 'Q.Cache.put',
				items: items
			})
		}
	}, {
		update: true
	})
}

	/**
	 * Returns a &lt;style&gt; tag with the content of all the stylesheets included inline
	 * @method stylesheetsInline
	 * @static
	 * @param {string} [$slotName=null] If provided, returns only the stylesheets added while filling this slot.
	 * @return {string} the style tags and their contents inline
	 */
	static function stylesheetsInline ($slotName = null, $setLoaded = false)
	{
		if (empty(self::$stylesheets)) {
			return '';
		}

		$baseUrl = Q_Request::baseUrl();
		$dest = parse_url(Q_Request::url(), PHP_URL_PATH);

		$sheets = self::stylesheetsArray($slotName, false);
		$sheets_for_slots = $imported_for_slots
		= $relativePathPrefixes_for_slots = array();
		$loaded = array();
		if (!empty($sheets)) {
			foreach ($sheets as $stylesheet) {
				$href = '';
				$media = 'screen,print';
				$type = 'text/css';
				extract($stylesheet, EXTR_IF_EXISTS);

				$ob = new Q_OutputBuffer();
				if (Q_Valid::url($href)
				and !Q::startsWith(Q_Html::themedUrl($href), $baseUrl)) {
					$imported_for_slots[$stylesheet['slot']][$href] = "@import url($href);";
				} else {
					list ($href, $filename) = Q_Html::themedUrlFilenameAndHash($href);
					if (!empty($loaded[$href])) {
						continue;
					}
					$stylesheetHref = Q_Html::themedUrl($stylesheet['href'], array('ignoreEnvironment' => true, 'noQuerystring' => true));
					$loaded[$stylesheetHref] = true;
					$loaded[$href] = true;
					try {
						Q::includeFile($filename);
					} catch (Exception $e) {}
					$src = parse_url($href, PHP_URL_PATH);
					$content = $ob->getClean();
					$relativePathPrefix = null;
					if (!trim($content)) {
						continue;
					}
					$content = Q_Utils::adjustRelativePaths($content, $src, $dest, 'css', $relativePathPrefix);
					$sheets_for_slots[$stylesheet['slot']][$href] = "\n$content";
					$relativePathPrefixes_for_slots[$stylesheet['slot']][$href] = $relativePathPrefix;
				}
			}
		}
		$parts = array();
		foreach ($imported_for_slots as $slot => $imported) {
			foreach ($imported as $href => $content) {
				$parts[] = Q_Html::tag(
					'style', 
					array('data-slot' => $slot, 'data-href' => $href),
					$content
				);
			}
		}
		foreach ($sheets_for_slots as $slot => $sheets) {
			foreach ($sheets as $href => $sheet) {
				$relativePathPrefix = $relativePathPrefixes_for_slots[$slot][$href];
				$parts[] = Q_Html::tag(
					'style', 
					array(
						'data-slot' => $slot, 
						'data-href' => $href,
						'data-path-prefix' => $relativePathPrefix
					),
					$sheet
				);
			}
		}
		if ($setLoaded) {
			self::setScriptData('Q.addStylesheet.loaded', $loaded);
		}
 		return implode("", $parts);
	}

	/**
	 * Returns the HTML markup for referencing all the stylesheets added so far
	 * @method stylesheets
	 * @static.
	 * @param {string} [$slotName=null] If provided, returns only the stylesheets
	 *   added while filling this slot.
	 * @param {string} [$between=''] Optional text to insert between the &lt;link&gt; tags
	 * @param {boolean} [$skipPreloads=false] Whether to skip automatically also adding
	 *   <link> tags informing the client on what to preload.
	 * @return {string} the HTML markup for referencing all the stylesheets added so far
	 */
	static function stylesheets ($slotName = null, $between = "\n", $skipPreloads = false)
	{
		if ($slotName === true) {
			$slotName = null; // for backward compatibility
		}
		static $consistent = null;
		if (!isset($slotName) and $consistent) {
			return $consistent;
		}
		$stylesheets = self::stylesheetsArray($slotName);
		if (empty($stylesheets)) {
			return '';
		}
		$preload = Q_Config::get('Q', 'stylesheets', 'preload', null);
		if ($preload === 'inline'
		and !Q_Request::isAjax()
		and !Q_Session::requestedId()) {
			$result = self::stylesheetsInline($slotName, true);
			if (!isset($slotName)) {
				$consistent = $result;
			}
			return $consistent;
		}
		$baseUrl = Q_Request::baseUrl();
		$tags = array();
		foreach ($stylesheets as $stylesheet) {
			$rel = 'stylesheet';
			$href = '';
			$media = 'screen,print';
			$type = 'text/css';
			$hash = null;
			extract($stylesheet, EXTR_IF_EXISTS);
			$attributes = @compact('rel', 'type', 'href', 'media');
			$attributes['data-slot'] = $stylesheet['slot'];
			$tags[] = Q_Html::tag('link', $attributes, null, @compact('hash'));

			if (!Q_Request::isAjax() && !Q_Session::requestedId()
			&& $preload === 'header' && Q::ifset(self::$preload, $href, null)
			&& (!Q_Valid::url($href) || Q::startsWith($href, $baseUrl))) {
				// the command below may fail because response body already started
				$href_encoded = Q_Utils::urlencodeNonAscii($href);
				@header("Link: <$href_encoded>; as=style; rel=preload", false);
			}
		}
		$result = implode($between, $tags);
		if (!isset($slotName)) {
			$consistent = $result;
		}
		return $result;
	}
	

we also have preload functionality