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// 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 marked === 'undefined' ) {
throw 'The reveal.js Markdown plugin requires marked to be loaded' ;
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}
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if ( typeof hljs !== 'undefined' ) {
marked . setOptions ( {
highlight : function ( lang , code ) {
return hljs . highlightAuto ( lang , code ) . value ;
}
} ) ;
}
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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 ) . textContent ;
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var leadingWs = text . match ( /^\n?(\s*)/ ) [ 1 ] . length ,
leadingTabs = text . match ( /^\n?(\t*)/ ) [ 1 ] . length ;
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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' ) ;
}
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return text ;
} ;
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var twrap = function ( el ) {
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return marked ( el ) ;
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} ;
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var getForwardedAttributes = function ( 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)/gi . test ( name ) ) continue ;
if ( value ) {
result . push ( name + '=' + value ) ;
}
else {
result . push ( name ) ;
}
}
return result . join ( ' ' ) ;
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} ;
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var slidifyMarkdown = function ( markdown , separator , vertical , attributes ) {
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separator = separator || '^\n---\n$' ;
var reSeparator = new RegExp ( separator + ( vertical ? '|' + vertical : '' ) , 'mg' ) ,
reHorSeparator = new RegExp ( separator ) ,
matches ,
lastIndex = 0 ,
isHorizontal ,
wasHorizontal = true ,
content ,
sectionStack = [ ] ,
markdownSections = '' ;
// iterate until all blocks between separators are stacked up
while ( matches = reSeparator . exec ( markdown ) ) {
// determine direction (horizontal by default)
isHorizontal = reHorSeparator . 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 = reSeparator . lastIndex ;
wasHorizontal = isHorizontal ;
}
// add the remaining slide
( wasHorizontal ? sectionStack : sectionStack [ sectionStack . length - 1 ] ) . push ( markdown . substring ( lastIndex ) ) ;
// flatten the hierarchical stack, and insert <section data-markdown> tags
for ( var k = 0 , klen = sectionStack . length ; k < klen ; k ++ ) {
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// horizontal
if ( typeof sectionStack [ k ] === 'string' ) {
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markdownSections += '<section ' + attributes + '>' + twrap ( sectionStack [ k ] ) + '</section>' ;
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}
// vertical
else {
markdownSections += '<section ' + attributes + '>' +
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'<section>' + sectionStack [ k ] . map ( twrap ) . join ( '</section><section>' ) + '</section>' +
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'</section>' ;
}
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}
return markdownSections ;
} ;
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var querySlidingMarkdown = function ( ) {
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var sections = document . querySelectorAll ( '[data-markdown]' ) ,
section ;
for ( var j = 0 , jlen = sections . length ; j < jlen ; j ++ ) {
section = sections [ j ] ;
if ( section . getAttribute ( 'data-markdown' ) . length ) {
var xhr = new XMLHttpRequest ( ) ,
url = section . getAttribute ( 'data-markdown' ) ;
xhr . onreadystatechange = function ( ) {
if ( xhr . readyState === 4 ) {
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if ( xhr . status >= 200 && xhr . status < 300 ) {
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section . outerHTML = slidifyMarkdown ( xhr . responseText , section . getAttribute ( 'data-separator' ) , section . getAttribute ( 'data-vertical' ) , getForwardedAttributes ( section ) ) ;
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} else {
section . outerHTML = '<section data-state="alert">ERROR: The attempt to fetch ' + url + ' failed with the HTTP status ' + xhr . status +
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'. Check your browser\'s JavaScript console for more details.' +
'<p>Remember that you need to serve the presentation HTML from a HTTP server and the Markdown file must be there too.</p></section>' ;
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}
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}
} ;
xhr . open ( 'GET' , url , false ) ;
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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 ) ;
}
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} else if ( section . getAttribute ( 'data-separator' ) ) {
var markdown = stripLeadingWhitespace ( section ) ;
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section . outerHTML = slidifyMarkdown ( markdown , section . getAttribute ( 'data-separator' ) , section . getAttribute ( 'data-vertical' ) , getForwardedAttributes ( section ) ) ;
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}
}
} ;
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var queryMarkdownSlides = function ( ) {
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var sections = document . querySelectorAll ( '[data-markdown]' ) ;
for ( var j = 0 , jlen = sections . length ; j < jlen ; j ++ ) {
makeHtml ( sections [ j ] ) ;
}
} ;
var makeHtml = function ( section ) {
var notes = section . querySelector ( 'aside.notes' ) ;
var markdown = stripLeadingWhitespace ( section ) ;
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section . innerHTML = marked ( markdown ) ;
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if ( notes ) {
section . appendChild ( notes ) ;
}
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} ;
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querySlidingMarkdown ( ) ;
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queryMarkdownSlides ( ) ;
} ) ( ) ;