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share/libs/revealjs/plugin/markdown/plugin.js  view on Meta::CPAN

	function processSlides( scope ) {

		return new Promise( function( resolve ) {

			const externalPromises = [];

			[].slice.call( scope.querySelectorAll( 'section[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 {

					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 )
					});

				}

			});

			Promise.all( externalPromises ).then( resolve );

		} );

	}

	function loadExternalMarkdown( section ) {

		return new Promise( function( resolve, reject ) {

			const xhr = new XMLHttpRequest(),
				url = section.getAttribute( 'data-markdown' );

			const 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 ) {

		const markdownClassesInElementsRegex = new RegExp( separator, 'mg' );
		const markdownClassRegex = new RegExp( "([^\"= ]+?)=\"([^\"]+?)\"|(data-[^\"= ]+?)(?=[\" ])", 'mg' );
		let nodeValue = node.nodeValue;
		let matches,
			matchesClass;
		if( matches = markdownClassesInElementsRegex.exec( nodeValue ) ) {

			const classes = matches[1];
			nodeValue = nodeValue.substring( 0, matches.index ) + nodeValue.substring( markdownClassesInElementsRegex.lastIndex );
			node.nodeValue = nodeValue;
			while( matchesClass = markdownClassRegex.exec( classes ) ) {
				if( matchesClass[2] ) {
					elementTarget.setAttribute( matchesClass[1], matchesClass[2] );
				} else {
					elementTarget.setAttribute( matchesClass[3], "" );
				}
			}