text: /**
   * The reveal.js markdown plugin. Handles parsing of
   * markdown inside of presentations as well as loading
   * of external markdown documents.
   */
  (function( root, factory ) {
  	if( typeof exports === 'object' ) {
  		module.exports = factory( require( './marked' ) );
  	}
  	else {
  		// Browser globals (root is window)
  		root.RevealMarkdown = factory( root.marked );
  		root.RevealMarkdown.initialize();
  	}
  }( this, function( marked ) {
  
  	if( typeof marked === 'undefined' ) {
  		throw 'The reveal.js Markdown plugin requires marked to be loaded';
  	}
  
  	if( typeof hljs !== 'undefined' ) {
  		marked.setOptions({
  			highlight: function( lang, code ) {
  				return hljs.highlightAuto( lang, code ).value;
  			}
  		});
  	}
  
  	var DEFAULT_SLIDE_SEPARATOR = '^\r?\n---\r?\n$',
  		DEFAULT_NOTES_SEPARATOR = 'note:',
  		DEFAULT_ELEMENT_ATTRIBUTES_SEPARATOR = '\\\.element\\\s*?(.+?)$',
  		DEFAULT_SLIDE_ATTRIBUTES_SEPARATOR = '\\\.slide:\\\s*?(\\\S.+?)$';
  
  	var SCRIPT_END_PLACEHOLDER = '__SCRIPT_END__';
  
  
  	/**
  	 * Retrieves the markdown contents of a slide section
  	 * element. Normalizes leading tabs/whitespace.
  	 */
  	function getMarkdownFromSlide( section ) {
  
  		var template = section.querySelector( 'script' );
  
  		// strip leading whitespace so it isn't evaluated as code
  		var text = ( template || section ).textContent;
  
  		// restore script end tags
  		text = text.replace( new RegExp( SCRIPT_END_PLACEHOLDER, 'g' ), '</script>' );
  
  		var leadingWs = text.match( /^\n?(\s*)/ )[1].length,
  			leadingTabs = text.match( /^\n?(\t*)/ )[1].length;
  
  		if( leadingTabs > 0 ) {
  			text = text.replace( new RegExp('\\n?\\t{' + leadingTabs + '}','g'), '\n' );
  		}
  		else if( leadingWs > 1 ) {
  			text = text.replace( new RegExp('\\n? {' + leadingWs + '}', 'g'), '\n' );
  		}
  
  		return text;
  
  	}
  
  	/**
  	 * Given a markdown slide section element, this will
  	 * return all arguments that aren't related to markdown
  	 * parsing. Used to forward any other user-defined arguments
  	 * to the output markdown slide.
  	 */
  	function getForwardedAttributes( section ) {
  
  		var attributes = section.attributes;
  		var result = [];
  
  		for( var i = 0, len = attributes.length; i < len; i++ ) {
  			var name = attributes[i].name,
  				value = attributes[i].value;
  
  			// disregard attributes that are used for markdown loading/parsing
  			if( /data\-(markdown|separator|vertical|notes)/gi.test( name ) ) continue;
  
  			if( value ) {
  				result.push( name + '="' + value + '"' );
  			}
  			else {
  				result.push( name );
  			}
  		}
  
  		return result.join( ' ' );
  
  	}
  
  	/**
  	 * Inspects the given options and fills out default
  	 * values for what's not defined.
  	 */
  	function getSlidifyOptions( options ) {
  
  		options = options || {};
  		options.separator = options.separator || DEFAULT_SLIDE_SEPARATOR;
  		options.notesSeparator = options.notesSeparator || DEFAULT_NOTES_SEPARATOR;
  		options.attributes = options.attributes || '';
  
  		return options;
  
  	}
  
  	/**
  	 * Helper function for constructing a markdown slide.
  	 */
  	function createMarkdownSlide( content, options ) {
  
  		options = getSlidifyOptions( options );
  
  		var notesMatch = content.split( new RegExp( options.notesSeparator, 'mgi' ) );
  
  		if( notesMatch.length === 2 ) {
  			content = notesMatch[0] + '<aside class="notes" data-markdown>' + notesMatch[1].trim() + '</aside>';
  		}
  
  		// prevent script end tags in the content from interfering
  		// with parsing
  		content = content.replace( /<\/script>/g, SCRIPT_END_PLACEHOLDER );
  
  		return '<script type="text/template">' + content + '</script>';
  
  	}
  
  	/**
  	 * Parses a data string into multiple slides based
  	 * on the passed in separator arguments.
  	 */
  	function slidify( markdown, options ) {
  
  		options = getSlidifyOptions( options );
  
  		var separatorRegex = new RegExp( options.separator + ( options.verticalSeparator ? '|' + options.verticalSeparator : '' ), 'mg' ),
  			horizontalSeparatorRegex = new RegExp( options.separator );
  
  		var matches,
  			lastIndex = 0,
  			isHorizontal,
  			wasHorizontal = true,
  			content,
  			sectionStack = [];
  
  		// iterate until all blocks between separators are stacked up
  		while( matches = separatorRegex.exec( markdown ) ) {
  			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 ) );
  
  		var markdownSections = '';
  
  		// flatten the hierarchical stack, and insert <section data-markdown> tags
  		for( var 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;
  
  	}
  
  	/**
  	 * Parses any current data-markdown slides, splits
  	 * multi-slide markdown into separate sections and
  	 * handles loading of external markdown.
  	 */
  	function processSlides() {
  
  		var sections = document.querySelectorAll( '[data-markdown]'),
  			section;
  
  		for( var i = 0, len = sections.length; i < len; i++ ) {
  
  			section = sections[i];
  
  			if( section.getAttribute( 'data-markdown' ).length ) {
  
  				var xhr = new XMLHttpRequest(),
  					url = section.getAttribute( 'data-markdown' );
  
  				datacharset = section.getAttribute( 'data-charset' );
  
  				// see https://developer.mozilla.org/en-US/docs/Web/API/element.getAttribute#Notes
  				if( datacharset != null && datacharset != '' ) {
  					xhr.overrideMimeType( 'text/html; charset=' + datacharset );
  				}
  
  				xhr.onreadystatechange = function() {
  					if( xhr.readyState === 4 ) {
  						// file protocol yields status code 0 (useful for local debug, mobile applications etc.)
  						if ( ( xhr.status >= 200 && xhr.status < 300 ) || xhr.status === 0 ) {
  
  							section.outerHTML = slidify( xhr.responseText, {
  								separator: section.getAttribute( 'data-separator' ),
  								verticalSeparator: section.getAttribute( 'data-separator-vertical' ),
  								notesSeparator: section.getAttribute( 'data-separator-notes' ),
  								attributes: getForwardedAttributes( section )
  							});
  
  						}
  						else {
  
  							section.outerHTML = '<section data-state="alert">' +
  								'ERROR: The attempt to fetch ' + url + ' failed with HTTP status ' + xhr.status + '.' +
  								'Check your browser\'s JavaScript console for more details.' +
  								'<p>Remember that you need to serve the presentation HTML from a HTTP server.</p>' +
  								'</section>';
  
  						}
  					}
  				};
  
  				xhr.open( 'GET', url, false );
  
  				try {
  					xhr.send();
  				}
  				catch ( e ) {
  					alert( 'Failed to get the Markdown file ' + url + '. Make sure that the presentation and the file are served by a HTTP server and the file can be found there. ' + e );
  				}
  
  			}
  			else if( section.getAttribute( 'data-separator' ) || section.getAttribute( 'data-separator-vertical' ) || section.getAttribute( 'data-separator-notes' ) ) {
  
  				section.outerHTML = slidify( getMarkdownFromSlide( section ), {
  					separator: section.getAttribute( 'data-separator' ),
  					verticalSeparator: section.getAttribute( 'data-separator-vertical' ),
  					notesSeparator: section.getAttribute( 'data-separator-notes' ),
  					attributes: getForwardedAttributes( section )
  				});
  
  			}
  			else {
  				section.innerHTML = createMarkdownSlide( getMarkdownFromSlide( section ) );
  			}
  		}
  
  	}
  
  	/**
  	 * Check if a node value has the attributes pattern.
  	 * If yes, extract it and add that value as one or several attributes
  	 * the the terget element.
  	 *
  	 * You need Cache Killer on Chrome to see the effect on any FOM transformation
  	 * directly on refresh (F5)
  	 * https://stackoverflow.com/questions/5690269/disabling-chrome-cache-for-website-development/7000899#answer-11786277
  	 */
  	function addAttributeInElement( node, elementTarget, separator ) {
  
  		var mardownClassesInElementsRegex = new RegExp( separator, 'mg' );
  		var mardownClassRegex = new RegExp( "([^\"= ]+?)=\"([^\"=]+?)\"", 'mg' );
  		var nodeValue = node.nodeValue;
  		if( matches = mardownClassesInElementsRegex.exec( nodeValue ) ) {
  
  			var classes = matches[1];
  			nodeValue = nodeValue.substring( 0, matches.index ) + nodeValue.substring( mardownClassesInElementsRegex.lastIndex );
  			node.nodeValue = nodeValue;
  			while( matchesClass = mardownClassRegex.exec( classes ) ) {
  				elementTarget.setAttribute( matchesClass[1], matchesClass[2] );
  			}
  			return true;
  		}
  		return false;
  	}
  
  	/**
  	 * Add attributes to the parent element of a text node,
  	 * or the element of an attribute node.
  	 */
  	function addAttributes( section, element, previousElement, separatorElementAttributes, separatorSectionAttributes ) {
  
  		if ( element != null && element.childNodes != undefined && element.childNodes.length > 0 ) {
  			previousParentElement = element;
  			for( var i = 0; i < element.childNodes.length; i++ ) {
  				childElement = element.childNodes[i];
  				if ( i > 0 ) {
  					j = i - 1;
  					while ( j >= 0 ) {
  						aPreviousChildElement = element.childNodes[j];
  						if ( typeof aPreviousChildElement.setAttribute == 'function' && aPreviousChildElement.tagName != "BR" ) {
  							previousParentElement = aPreviousChildElement;
  							break;
  						}
  						j = j - 1;
  					}
  				}
  				parentSection = section;
  				if( childElement.nodeName ==  "section" ) {
  					parentSection = childElement ;
  					previousParentElement = childElement ;
  				}
  				if ( typeof childElement.setAttribute == 'function' || childElement.nodeType == Node.COMMENT_NODE ) {
  					addAttributes( parentSection, childElement, previousParentElement, separatorElementAttributes, separatorSectionAttributes );
  				}
  			}
  		}
  
  		if ( element.nodeType == Node.COMMENT_NODE ) {
  			if ( addAttributeInElement( element, previousElement, separatorElementAttributes ) == false ) {
  				addAttributeInElement( element, section, separatorSectionAttributes );
  			}
  		}
  	}
  
  	/**
  	 * Converts any current data-markdown slides in the
  	 * DOM to HTML.
  	 */
  	function convertSlides() {
  
  		var sections = document.querySelectorAll( '[data-markdown]');
  
  		for( var i = 0, len = sections.length; i < len; i++ ) {
  
  			var section = sections[i];
  
  			// Only parse the same slide once
  			if( !section.getAttribute( 'data-markdown-parsed' ) ) {
  
  				section.setAttribute( 'data-markdown-parsed', true )
  
  				var notes = section.querySelector( 'aside.notes' );
  				var markdown = getMarkdownFromSlide( section );
  
  				section.innerHTML = marked( markdown );
  				addAttributes( 	section, section, null, section.getAttribute( 'data-element-attributes' ) ||
  								section.parentNode.getAttribute( 'data-element-attributes' ) ||
  								DEFAULT_ELEMENT_ATTRIBUTES_SEPARATOR,
  								section.getAttribute( 'data-attributes' ) ||
  								section.parentNode.getAttribute( 'data-attributes' ) ||
  								DEFAULT_SLIDE_ATTRIBUTES_SEPARATOR);
  
  				// If there were notes, we need to re-add them after
  				// having overwritten the section's HTML
  				if( notes ) {
  					section.appendChild( notes );
  				}
  
  			}
  
  		}
  
  	}
  
  	// API
  	return {
  
  		initialize: function() {
  			processSlides();
  			convertSlides();
  		},
  
  		// TODO: Do these belong in the API?
  		processSlides: processSlides,
  		convertSlides: convertSlides,
  		slidify: slidify
  
  	};
  
  }));
  