function readURL()

in js/reveal.js [4280:4335]
37 lines of code
17 McCabe index (conditional complexity)

	function readURL() {

		var hash = window.location.hash;

		// Attempt to parse the hash as either an index or name
		var bits = hash.slice( 2 ).split( '/' ),
			name = hash.replace( /#|\//gi, '' );

		// If the first bit is not fully numeric and there is a name we
		// can assume that this is a named link
		if( !/^[0-9]*$/.test( bits[0] ) && name.length ) {
			var element;

			// Ensure the named link is a valid HTML ID attribute
			try {
				element = document.getElementById( decodeURIComponent( name ) );
			}
			catch ( error ) { }

			// Ensure that we're not already on a slide with the same name
			var isSameNameAsCurrentSlide = currentSlide ? currentSlide.getAttribute( 'id' ) === name : false;

			if( element ) {
				// If the slide exists and is not the current slide...
				if ( !isSameNameAsCurrentSlide ) {
					// ...find the position of the named slide and navigate to it
					var indices = Reveal.getIndices(element);
					slide(indices.h, indices.v);
				}
			}
			// If the slide doesn't exist, navigate to the current slide
			else {
				slide( indexh || 0, indexv || 0 );
			}
		}
		else {
			var hashIndexBase = config.hashOneBasedIndex ? 1 : 0;

			// Read the index components of the hash
			var h = ( parseInt( bits[0], 10 ) - hashIndexBase ) || 0,
				v = ( parseInt( bits[1], 10 ) - hashIndexBase ) || 0,
				f;

			if( config.fragmentInURL ) {
				f = parseInt( bits[2], 10 );
				if( isNaN( f ) ) {
					f = undefined;
				}
			}

			if( h !== indexh || v !== indexv || f !== undefined ) {
				slide( h, v, f );
			}
		}

	}