148 lines
4.5 KiB
JavaScript
148 lines
4.5 KiB
JavaScript
// From https://gist.github.com/1343518
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// Modified by Hakim to handle Markdown indented with tabs
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(function(){
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if( typeof Showdown === 'undefined' ) {
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throw 'The reveal.js Markdown plugin requires Showdown to be loaded';
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}
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var stripLeadingWhitespace = function(section) {
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var template = section.querySelector( 'script' );
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// strip leading whitespace so it isn't evaluated as code
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var text = ( template || section ).innerHTML;
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var leadingWs = text.match(/^\n?(\s*)/)[1].length,
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leadingTabs = text.match(/^\n?(\t*)/)[1].length;
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if( leadingTabs > 0 ) {
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text = text.replace( new RegExp('\\n?\\t{' + leadingTabs + '}','g'), '\n' );
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}
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else if( leadingWs > 1 ) {
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text = text.replace( new RegExp('\\n? {' + leadingWs + '}','g'), '\n' );
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}
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return text;
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};
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var slidifyMarkdown = function(markdown, separator, vertical) {
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separator = separator || '^\n---\n$';
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var reSeparator = new RegExp(separator + (vertical ? '|' + vertical : ''), 'mg'),
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reHorSeparator = new RegExp(separator),
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matches,
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lastIndex = 0,
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isHorizontal,
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wasHorizontal = true,
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content,
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sectionStack = [],
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markdownSections = '';
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// iterate until all blocks between separators are stacked up
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while( matches = reSeparator.exec(markdown) ) {
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// determine direction (horizontal by default)
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isHorizontal = reHorSeparator.test(matches[0]);
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if( !isHorizontal && wasHorizontal ) {
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// create vertical stack
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sectionStack.push([]);
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}
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// pluck slide content from markdown input
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content = markdown.substring(lastIndex, matches.index);
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if( isHorizontal && wasHorizontal ) {
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// add to horizontal stack
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sectionStack.push(content);
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} else {
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// add to vertical stack
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sectionStack[sectionStack.length-1].push(content);
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}
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lastIndex = reSeparator.lastIndex;
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wasHorizontal = isHorizontal;
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}
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// add the remaining slide
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(wasHorizontal ? sectionStack : sectionStack[sectionStack.length-1]).push(markdown.substring(lastIndex));
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// flatten the hierarchical stack, and insert <section data-markdown> tags
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for( var k = 0, klen = sectionStack.length; k < klen; k++ ) {
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markdownSections += typeof sectionStack[k] === 'string'
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? '<section data-markdown>' + sectionStack[k] + '</section>'
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: '<section><section data-markdown>' + sectionStack[k].join('</section><section data-markdown>') + '</section></section>';
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}
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return markdownSections;
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};
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var querySlidingMarkdown = function() {
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var sections = document.querySelectorAll( '[data-markdown]'),
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section;
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for( var j = 0, jlen = sections.length; j < jlen; j++ ) {
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section = sections[j];
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if( section.getAttribute('data-markdown').length ) {
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var xhr = new XMLHttpRequest(),
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url = section.getAttribute('data-markdown');
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xhr.onreadystatechange = function () {
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if( xhr.readyState === 4 ) {
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section.outerHTML = slidifyMarkdown( xhr.responseText, section.getAttribute('data-separator'), section.getAttribute('data-vertical') );
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}
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};
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xhr.open('GET', url, false);
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xhr.send();
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} else if( section.getAttribute('data-separator') ) {
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var markdown = stripLeadingWhitespace(section);
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section.outerHTML = slidifyMarkdown( markdown, section.getAttribute('data-separator'), section.getAttribute('data-vertical') );
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}
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}
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};
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var queryMarkdownSlides = function() {
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var sections = document.querySelectorAll( '[data-markdown]');
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for( var j = 0, jlen = sections.length; j < jlen; j++ ) {
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makeHtml(sections[j]);
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}
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};
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var makeHtml = function(section) {
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var notes = section.querySelector( 'aside.notes' );
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var markdown = stripLeadingWhitespace(section);
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section.innerHTML = (new Showdown.converter()).makeHtml(markdown);
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if( notes ) {
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section.appendChild( notes );
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}
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};
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querySlidingMarkdown();
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queryMarkdownSlides();
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})();
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