Add framework for creating reveal.js presentations.

assets/vendor/reveal/plugin/markdown/plugin.js

@@ -0,0 +1,451 @@
+/*!
+ * The reveal.js markdown plugin. Handles parsing of
+ * markdown inside of presentations as well as loading
+ * of external markdown documents.
+ */
+
+import marked from 'marked'
+
+const DEFAULT_SLIDE_SEPARATOR = '^\r?\n---\r?\n$',
+	  DEFAULT_NOTES_SEPARATOR = 'notes?:',
+	  DEFAULT_ELEMENT_ATTRIBUTES_SEPARATOR = '\\\.element\\\s*?(.+?)$',
+	  DEFAULT_SLIDE_ATTRIBUTES_SEPARATOR = '\\\.slide:\\\s*?(\\\S.+?)$';
+
+const SCRIPT_END_PLACEHOLDER = '__SCRIPT_END__';
+
+const CODE_LINE_NUMBER_REGEX = /\[([\s\d,|-]*)\]/;
+
+const Plugin = () => {
+
+	// The reveal.js instance this plugin is attached to
+	let deck;
+
+	/**
+	 * Retrieves the markdown contents of a slide section
+	 * element. Normalizes leading tabs/whitespace.
+	 */
+	function getMarkdownFromSlide( section ) {
+
+		// look for a <script> or <textarea data-template> wrapper
+		var template = section.querySelector( '[data-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">' + marked(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 ) ) {
+			var 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( scope ) {
+
+		return new Promise( function( resolve ) {
+
+			var externalPromises = [];
+
+			[].slice.call( scope.querySelectorAll( '[data-markdown]:not([data-markdown-parsed])') ).forEach( function( section, i ) {
+
+				if( section.getAttribute( 'data-markdown' ).length ) {
+
+					externalPromises.push( loadExternalMarkdown( section ).then(
+
+						// Finished loading external file
+						function( xhr, url ) {
+							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 )
+							});
+						},
+
+						// Failed to load markdown
+						function( xhr, url ) {
+							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>';
+						}
+
+					) );
+
+				}
+				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 `<pre><code ${lineNumbers} class="${language}">${code}</code></pre>`;
+			};
+
+			marked.setOptions( {
+				renderer,
+				...deck.getConfig().markdown
+			} );
+
+			return processSlides( deck.getRevealElement() ).then( convertSlides );
+
+		},
+
+		// TODO: Do these belong in the API?
+		processSlides: processSlides,
+		convertSlides: convertSlides,
+		slidify: slidify,
+		marked: marked
+	}
+
+};
+
+export default Plugin;