' +
+ 'ERROR: The attempt to fetch ' + url + ' failed with HTTP status ' + xhr.status + '.' +
+ 'Check your browser\'s JavaScript console for more details.' +
+ 'Remember that you need to serve the presentation HTML from a HTTP server.
' +
+ '';
+ }
+
+ ) );
+
+ }
+ 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 ) );
+ }
+
+ });
+
+ Promise.all( externalPromises ).then( resolve );
+
+ } );
+
+ }
+
+ function loadExternalMarkdown( section ) {
+
+ return new Promise( function( resolve, reject ) {
+
+ var xhr = new XMLHttpRequest(),
+ url = section.getAttribute( 'data-markdown' );
+
+ var 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( section, xhr ) {
+ 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 ) {
+
+ resolve( xhr, url );
+
+ }
+ else {
+
+ reject( xhr, url );
+
+ }
+ }
+ }.bind( this, section, xhr );
+
+ xhr.open( 'GET', url, true );
+
+ try {
+ xhr.send();
+ }
+ catch ( e ) {
+ console.warn( '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 );
+ resolve( xhr, url );
+ }
+
+ } );
+
+ }
+
+ /**
+ * Check if a node value has the attributes pattern.
+ * If yes, extract it and add that value as one or several attributes
+ * to the target element.
+ *
+ * You need Cache Killer on Chrome to see the effect on any FOM transformation
+ * directly on refresh (F5)
+ * http://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( "([^\"= ]+?)=\"([^\"]+?)\"|(data-[^\"= ]+?)(?=[\" ])", 'mg' );
+ var nodeValue = node.nodeValue;
+ var matches,
+ matchesClass;
+ 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 ) ) {
+ if( matchesClass[2] ) {
+ elementTarget.setAttribute( matchesClass[1], matchesClass[2] );
+ } else {
+ elementTarget.setAttribute( matchesClass[3], "" );
+ }
+ }
+ 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 ) {
+ var previousParentElement = element;
+ for( var i = 0; i < element.childNodes.length; i++ ) {
+ var childElement = element.childNodes[i];
+ if ( i > 0 ) {
+ var j = i - 1;
+ while ( j >= 0 ) {
+ var aPreviousChildElement = element.childNodes[j];
+ if ( typeof aPreviousChildElement.setAttribute == 'function' && aPreviousChildElement.tagName != "BR" ) {
+ previousParentElement = aPreviousChildElement;
+ break;
+ }
+ j = j - 1;
+ }
+ }
+ var 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 = deck.getRevealElement().querySelectorAll( '[data-markdown]:not([data-markdown-parsed])');
+
+ [].slice.call( sections ).forEach( function( section ) {
+
+ 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 );
+ }
+
+ } );
+
+ return Promise.resolve();
+
+ }
+
+ return {
+ id: 'markdown',
+
+ /**
+ * Starts processing and converting Markdown within the
+ * current reveal.js deck.
+ */
+ init: function( reveal ) {
+
+ deck = reveal;
+
+ let renderer = new marked.Renderer();
+
+ renderer.code = ( code, language ) => {
+
+ // Off by default
+ let lineNumbers = '';
+
+ // Users can opt in to show line numbers and highlight
+ // specific lines.
+ // ```javascript [] show line numbers
+ // ```javascript [1,4-8] highlights lines 1 and 4-8
+ if( CODE_LINE_NUMBER_REGEX.test( language ) ) {
+ lineNumbers = language.match( CODE_LINE_NUMBER_REGEX )[1].trim();
+ lineNumbers = `data-line-numbers="${lineNumbers}"`;
+ language = language.replace( CODE_LINE_NUMBER_REGEX, '' ).trim();
+ }
+
+ return `