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-/**
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- * The reveal.js markdown plugin. Handles parsing of
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- * markdown inside of presentations as well as loading
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- * of external markdown documents.
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- * Referred from The reveal.js markdown plugin.
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- * https://github.com/hakimel/reveal.js/blob/master/plugin/markdown/markdown.js
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- */
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-export default function( marked ) {
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-
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- const DEFAULT_SLIDE_SEPARATOR = '^\r?\n---\r?\n$',
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- DEFAULT_NOTES_SEPARATOR = 'notes?:',
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- DEFAULT_ELEMENT_ATTRIBUTES_SEPARATOR = '\\\.element\\\s*?(.+?)$',
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- DEFAULT_SLIDE_ATTRIBUTES_SEPARATOR = '\\\.slide:\\\s*?(\\\S.+?)$';
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-
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- const SCRIPT_END_PLACEHOLDER = '__SCRIPT_END__';
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-
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-
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- /**
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- * Retrieves the markdown contents of a slide section
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- * element. Normalizes leading tabs/whitespace.
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- */
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- function getMarkdownFromSlide( section ) {
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-
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- // look for a <script> or <textarea data-template> wrapper
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- let template = section.querySelector( '[data-template]' ) || section.querySelector( 'script' );
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-
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- // strip leading whitespace so it isn't evaluated as code
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- let text = ( template || section ).textContent;
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-
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- // restore script end tags
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- text = text.replace( new RegExp( SCRIPT_END_PLACEHOLDER, 'g' ), '</script>' );
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-
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- let leadingWs = text.match( /^\n?(\s*)/ )[1].length,
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- leadingTabs = text.match( /^\n?(\t*)/ )[1].length;
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-
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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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-
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- return text;
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-
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- }
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-
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- /**
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- * Given a markdown slide section element, this will
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- * return all arguments that aren't related to markdown
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- * parsing. Used to forward any other user-defined arguments
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- * to the output markdown slide.
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- */
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- function getForwardedAttributes( section ) {
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-
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- let attributes = section.attributes;
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- let result = [];
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-
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- for ( let i = 0, len = attributes.length; i < len; i++ ) {
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- let name = attributes[i].name,
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- value = attributes[i].value;
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-
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- // disregard attributes that are used for markdown loading/parsing
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- if ( /data\-(markdown|separator|vertical|notes)/gi.test( name ) ) continue;
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-
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- if ( value ) {
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- result.push( name + '="' + value + '"' );
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- }
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- else {
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- result.push( name );
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- }
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- }
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-
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- return result.join( ' ' );
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-
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- }
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-
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- /**
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- * Inspects the given options and fills out default
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- * values for what's not defined.
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- */
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- function getSlidifyOptions( options ) {
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-
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- options = options || {};
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- options.separator = options.separator || DEFAULT_SLIDE_SEPARATOR;
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- options.notesSeparator = options.notesSeparator || DEFAULT_NOTES_SEPARATOR;
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- options.attributes = options.attributes || '';
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-
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- return options;
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-
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- }
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-
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- /**
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- * Helper function for constructing a markdown slide.
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- */
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- function createMarkdownSlide( content, options ) {
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-
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- options = getSlidifyOptions( options );
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-
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- let notesMatch = content.split( new RegExp( options.notesSeparator, 'mgi' ) );
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-
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- if ( notesMatch.length === 2 ) {
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- content = notesMatch[0] + '<aside class="notes">' + marked(notesMatch[1].trim()) + '</aside>';
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- }
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-
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- // prevent script end tags in the content from interfering
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- // with parsing
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- content = content.replace( /<\/script>/g, SCRIPT_END_PLACEHOLDER );
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-
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- return '<script type="text/template">' + content + '</script>';
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-
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- }
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-
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- /**
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- * Parses a data string into multiple slides based
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- * on the passed in separator arguments.
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- */
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- function slidify( markdown, options ) {
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-
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- options = getSlidifyOptions( options );
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-
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- let separatorRegex = new RegExp( options.separator + ( options.verticalSeparator ? '|' + options.verticalSeparator : '' ), 'mg' ),
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- horizontalSeparatorRegex = new RegExp( options.separator );
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-
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- let 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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-
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- // iterate until all blocks between separators are stacked up
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- while ( (matches = separatorRegex.exec( markdown )) != null ) {
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- // notes = null;
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-
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- // determine direction (horizontal by default)
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- isHorizontal = horizontalSeparatorRegex.test( matches[0] );
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-
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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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-
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- // pluck slide content from markdown input
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- content = markdown.substring( lastIndex, matches.index );
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-
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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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- }
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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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-
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- lastIndex = separatorRegex.lastIndex;
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- wasHorizontal = isHorizontal;
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- }
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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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-
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- let markdownSections = '';
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-
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- // flatten the hierarchical stack, and insert <section data-markdown> tags
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- for ( let i = 0, len = sectionStack.length; i < len; i++ ) {
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- // vertical
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- if ( sectionStack[i] instanceof Array ) {
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- markdownSections += '<section '+ options.attributes +'>';
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-
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- sectionStack[i].forEach( function( child ) {
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- markdownSections += '<section data-markdown>' + createMarkdownSlide( child, options ) + '</section>';
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- } );
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-
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- markdownSections += '</section>';
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- }
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- else {
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- markdownSections += '<section '+ options.attributes +' data-markdown>' + createMarkdownSlide( sectionStack[i], options ) + '</section>';
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- }
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- }
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-
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- return markdownSections;
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-
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- }
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-
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- /**
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- * Parses any current data-markdown slides, splits
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- * multi-slide markdown into separate sections and
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- * handles loading of external markdown.
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- */
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- function processSlides() {
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-
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- let sections = document.querySelectorAll( '[data-markdown]'),
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- section;
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-
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- for ( let i = 0, len = sections.length; i < len; i++ ) {
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-
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- section = sections[i];
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-
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- if ( section.getAttribute( 'data-markdown' ).length ) {
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-
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- let xhr = new XMLHttpRequest(),
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- url = section.getAttribute( 'data-markdown' );
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-
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- let datacharset = section.getAttribute( 'data-charset' );
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-
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- // see https://developer.mozilla.org/en-US/docs/Web/API/element.getAttribute#Notes
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- if ( datacharset != null && datacharset != '' ) {
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- xhr.overrideMimeType( 'text/html; charset=' + datacharset );
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- }
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-
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- xhr.onreadystatechange = function() {
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- if ( xhr.readyState === 4 ) {
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- // file protocol yields status code 0 (useful for local debug, mobile applications etc.)
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- if ( ( xhr.status >= 200 && xhr.status < 300 ) || xhr.status === 0 ) {
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-
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- section.outerHTML = slidify( xhr.responseText, {
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- separator: section.getAttribute( 'data-separator' ),
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- verticalSeparator: section.getAttribute( 'data-separator-vertical' ),
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- notesSeparator: section.getAttribute( 'data-separator-notes' ),
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- attributes: getForwardedAttributes( section )
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- });
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-
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- }
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- else {
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-
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- section.outerHTML = '<section data-state="alert">' +
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- 'ERROR: The attempt to fetch ' + url + ' failed with HTTP status ' + xhr.status + '.' +
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- 'Check your browser\'s JavaScript console for more details.' +
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- '<p>Remember that you need to serve the presentation HTML from a HTTP server.</p>' +
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- '</section>';
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-
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- }
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- }
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- };
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-
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- xhr.open( 'GET', url, false );
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-
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- try {
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- xhr.send();
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- }
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- catch ( e ) {
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- 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 );
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- }
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-
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- }
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- else if ( section.getAttribute( 'data-separator' ) || section.getAttribute( 'data-separator-vertical' ) || section.getAttribute( 'data-separator-notes' ) ) {
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-
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- section.outerHTML = slidify( getMarkdownFromSlide( section ), {
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- separator: section.getAttribute( 'data-separator' ),
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- verticalSeparator: section.getAttribute( 'data-separator-vertical' ),
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- notesSeparator: section.getAttribute( 'data-separator-notes' ),
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- attributes: getForwardedAttributes( section )
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- });
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-
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- }
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- else {
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- section.innerHTML = createMarkdownSlide( getMarkdownFromSlide( section ) );
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- }
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- }
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-
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- }
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-
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- /**
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- * Check if a node value has the attributes pattern.
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- * If yes, extract it and add that value as one or several attributes
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- * the the terget element.
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- *
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- * You need Cache Killer on Chrome to see the effect on any FOM transformation
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- * directly on refresh (F5)
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- * http://stackoverflow.com/questions/5690269/disabling-chrome-cache-for-website-development/7000899#answer-11786277
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- */
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- function addAttributeInElement( node, elementTarget, separator ) {
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-
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- let mardownClassesInElementsRegex = new RegExp( separator, 'mg' );
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- let mardownClassRegex = new RegExp( "([^\"= ]+?)=\"([^\"=]+?)\"", 'mg' );
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- let nodeValue = node.nodeValue;
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- let matches = mardownClassesInElementsRegex.exec( nodeValue );
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- if ( matches != null ) {
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-
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- let classes = matches[1];
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- nodeValue = nodeValue.substring( 0, matches.index ) + nodeValue.substring( mardownClassesInElementsRegex.lastIndex );
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- node.nodeValue = nodeValue;
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- let matchesClass;
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- while ( (matchesClass = mardownClassRegex.exec( classes )) != null ) {
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- elementTarget.setAttribute( matchesClass[1], matchesClass[2] );
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- }
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- return true;
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- }
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- return false;
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- }
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-
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- /**
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- * Add attributes to the parent element of a text node,
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- * or the element of an attribute node.
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- */
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- function addAttributes( section, element, previousElement, separatorElementAttributes, separatorSectionAttributes ) {
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-
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- if ( element != null && element.childNodes != undefined && element.childNodes.length > 0 ) {
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- let previousParentElement = element;
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- for ( let i = 0; i < element.childNodes.length; i++ ) {
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- let childElement = element.childNodes[i];
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- if ( i > 0 ) {
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- let j = i - 1;
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- while ( j >= 0 ) {
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- let aPreviousChildElement = element.childNodes[j];
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- if ( typeof aPreviousChildElement.setAttribute == 'function' && aPreviousChildElement.tagName != 'BR' ) {
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- previousParentElement = aPreviousChildElement;
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- break;
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- }
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- j = j - 1;
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- }
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- }
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- let parentSection = section;
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- if ( childElement.nodeName == 'section' ) {
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- parentSection = childElement ;
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- previousParentElement = childElement ;
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- }
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- if ( typeof childElement.setAttribute == 'function' || childElement.nodeType == Node.COMMENT_NODE ) {
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|
|
|
|
- addAttributes( parentSection, childElement, previousParentElement, separatorElementAttributes, separatorSectionAttributes );
|
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|
|
|
- }
|
|
|
|
|
- }
|
|
|
|
|
- }
|
|
|
|
|
-
|
|
|
|
|
- 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() {
|
|
|
|
|
-
|
|
|
|
|
- let sections = document.querySelectorAll( '[data-markdown]');
|
|
|
|
|
-
|
|
|
|
|
- for ( let i = 0, len = sections.length; i < len; i++ ) {
|
|
|
|
|
-
|
|
|
|
|
- let section = sections[i];
|
|
|
|
|
-
|
|
|
|
|
- // Only parse the same slide once
|
|
|
|
|
- if ( !section.getAttribute( 'data-markdown-parsed' ) ) {
|
|
|
|
|
-
|
|
|
|
|
- section.setAttribute( 'data-markdown-parsed', true );
|
|
|
|
|
-
|
|
|
|
|
- let notes = section.querySelector( 'aside.notes' );
|
|
|
|
|
- let 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 {
|
|
|
|
|
- getMarkdownFromSlide: getMarkdownFromSlide,
|
|
|
|
|
- createMarkdownSlide: createMarkdownSlide,
|
|
|
|
|
- processSlides: processSlides,
|
|
|
|
|
- addAttributes: addAttributes,
|
|
|
|
|
- convertSlides: convertSlides
|
|
|
|
|
- };
|
|
|
|
|
-}
|
|
|