function slidify()

in plugin/markdown/plugin.js [135:201]
42 lines of code
10 McCabe index (conditional complexity)

	function slidify( markdown, options ) {

		options = getSlidifyOptions( options );

		const separatorRegex = new RegExp( options.separator + ( options.verticalSeparator ? '|' + options.verticalSeparator : '' ), 'mg' ),
			horizontalSeparatorRegex = new RegExp( options.separator );

		let matches,
			lastIndex = 0,
			isHorizontal,
			wasHorizontal = true,
			content,
			sectionStack = [];

		// iterate until all blocks between separators are stacked up
		while( matches = separatorRegex.exec( markdown ) ) {
			const notes = null;

			// determine direction (horizontal by default)
			isHorizontal = horizontalSeparatorRegex.test( matches[0] );

			if( !isHorizontal && wasHorizontal ) {
				// create vertical stack
				sectionStack.push( [] );
			}

			// pluck slide content from markdown input
			content = markdown.substring( lastIndex, matches.index );

			if( isHorizontal && wasHorizontal ) {
				// add to horizontal stack
				sectionStack.push( content );
			}
			else {
				// add to vertical stack
				sectionStack[sectionStack.length-1].push( content );
			}

			lastIndex = separatorRegex.lastIndex;
			wasHorizontal = isHorizontal;
		}

		// add the remaining slide
		( wasHorizontal ? sectionStack : sectionStack[sectionStack.length-1] ).push( markdown.substring( lastIndex ) );

		let markdownSections = '';

		// flatten the hierarchical stack, and insert <section data-markdown> tags
		for( let i = 0, len = sectionStack.length; i < len; i++ ) {
			// vertical
			if( sectionStack[i] instanceof Array ) {
				markdownSections += '<section '+ options.attributes +'>';

				sectionStack[i].forEach( function( child ) {
					markdownSections += '<section data-markdown>' + createMarkdownSlide( child, options ) + '</section>';
				} );

				markdownSections += '</section>';
			}
			else {
				markdownSections += '<section '+ options.attributes +' data-markdown>' + createMarkdownSlide( sectionStack[i], options ) + '</section>';
			}
		}

		return markdownSections;

	}