getIndicesFromHash()

in js/controllers/location.js [43:97]

• 37 lines of code
• 13 McCabe index (conditional complexity)

	getIndicesFromHash( hash=window.location.hash, options={} ) {

		// Attempt to parse the hash as either an index or name
		let name = hash.replace( /^#\/?/, '' );
		let bits = name.split( '/' );

		// 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 ) {
			let slide;

			let f;

			// Parse named links with fragments (#/named-link/2)
			if( /\/[-\d]+$/g.test( name ) ) {
				f = parseInt( name.split( '/' ).pop(), 10 );
				f = isNaN(f) ? undefined : f;
				name = name.split( '/' ).shift();
			}

			// Ensure the named link is a valid HTML ID attribute
			try {
				slide = document
					.getElementById( decodeURIComponent( name ) )
					.closest('.slides>section, .slides>section>section');
			}
			catch ( error ) { }

			if( slide ) {
				return { ...this.Reveal.getIndices( slide ), f };
			}
		}
		else {
			const config = this.Reveal.getConfig();
			let hashIndexBase = config.hashOneBasedIndex || options.oneBasedIndex ? 1 : 0;

			// Read the index components of the hash
			let 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;
				}
			}

			return { h, v, f };
		}

		// The hash couldn't be parsed or no matching named link was found
		return null

	}