m.route = function()

in source/console/app/lib/aws-ui/AWS-UI-Components/components.js [1612:1676]
42 lines of code
19 McCabe index (conditional complexity)

	m.route = function() {
		//m.route()
		if (arguments.length === 0) return currentRoute;
		//m.route(el, defaultRoute, routes)
		else if (arguments.length === 3 && type.call(arguments[1]) === STRING) {
			var root = arguments[0], defaultRoute = arguments[1], router = arguments[2];
			redirect = function(source) {
				var path = currentRoute = normalizeRoute(source);
				if (!routeByValue(root, router, path)) {
					m.route(defaultRoute, true)
				}
			};
			var listener = m.route.mode === "hash" ? "onhashchange" : "onpopstate";
			window[listener] = function() {
				var path = $location[m.route.mode]
				if (m.route.mode === "pathname") path += $location.search
				if (currentRoute != normalizeRoute(path)) {
					redirect(path)
				}
			};
			computePostRedrawHook = setScroll;
			window[listener]()
		}
		//config: m.route
		else if (arguments[0].addEventListener || arguments[0].attachEvent) {
			var element = arguments[0];
			var isInitialized = arguments[1];
			var context = arguments[2];
			element.href = (m.route.mode !== 'pathname' ? $location.pathname : '') + modes[m.route.mode] + this.attrs.href;
			if (element.addEventListener) {
				element.removeEventListener("click", routeUnobtrusive);
				element.addEventListener("click", routeUnobtrusive)
			}
			else {
				element.detachEvent("onclick", routeUnobtrusive);
				element.attachEvent("onclick", routeUnobtrusive)
			}
		}
		//m.route(route, params)
		else if (type.call(arguments[0]) === STRING) {
			var oldRoute = currentRoute;
			currentRoute = arguments[0];
			var args = arguments[1] || {}
			var queryIndex = currentRoute.indexOf("?")
			var params = queryIndex > -1 ? parseQueryString(currentRoute.slice(queryIndex + 1)) : {}
			for (var i in args) params[i] = args[i]
			var querystring = buildQueryString(params)
			var currentPath = queryIndex > -1 ? currentRoute.slice(0, queryIndex) : currentRoute
			if (querystring) currentRoute = currentPath + (currentPath.indexOf("?") === -1 ? "?" : "&") + querystring;

			var shouldReplaceHistoryEntry = (arguments.length === 3 ? arguments[2] : arguments[1]) === true || oldRoute === arguments[0];

			if (window.history.pushState) {
				computePostRedrawHook = function() {
					window.history[shouldReplaceHistoryEntry ? "replaceState" : "pushState"](null, $document.title, modes[m.route.mode] + currentRoute);
					setScroll()
				};
				redirect(modes[m.route.mode] + currentRoute)
			}
			else {
				$location[m.route.mode] = currentRoute
				redirect(modes[m.route.mode] + currentRoute)
			}
		}
	};