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+/**
+ * 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)
+ * 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( "([^\"= ]+?)=\"([^\"=]+?)\"", '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
+
+ };
+
+}));