function availableRoutes()

in js/reveal.js [1832:1883]
43 lines of code
16 McCabe index (conditional complexity)

	function availableRoutes({ includeFragments = false } = {}) {

		let horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
			verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );

		let routes = {
			left: indexh > 0,
			right: indexh < horizontalSlides.length - 1,
			up: indexv > 0,
			down: indexv < verticalSlides.length - 1
		};

		// Looped presentations can always be navigated as long as
		// there are slides available
		if( config.loop ) {
			if( horizontalSlides.length > 1 ) {
				routes.left = true;
				routes.right = true;
			}

			if( verticalSlides.length > 1 ) {
				routes.up = true;
				routes.down = true;
			}
		}

		if ( horizontalSlides.length > 1 && config.navigationMode === 'linear' ) {
			routes.right = routes.right || routes.down;
			routes.left = routes.left || routes.up;
		}

		// If includeFragments is set, a route will be considered
		// available if either a slid OR fragment is available in
		// the given direction
		if( includeFragments === true ) {
			let fragmentRoutes = fragments.availableRoutes();
			routes.left = routes.left || fragmentRoutes.prev;
			routes.up = routes.up || fragmentRoutes.prev;
			routes.down = routes.down || fragmentRoutes.next;
			routes.right = routes.right || fragmentRoutes.next;
		}

		// Reverse horizontal controls for rtl
		if( config.rtl ) {
			let left = routes.left;
			routes.left = routes.right;
			routes.right = left;
		}

		return routes;

	}