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+/**
+ * A plugin which enables rendering of math equations inside
+ * of reveal.js slides. Essentially a thin wrapper for MathJax.
+ *
+ * @author Hakim El Hattab
+ */
+var RevealMath = window.RevealMath || (function(){
+
+ var options = Reveal.getConfig().math || {};
+ var mathjax = options.mathjax || 'https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js';
+ var config = options.config || 'TeX-AMS_HTML-full';
+ var url = mathjax + '?config=' + config;
+
+ var defaultOptions = {
+ messageStyle: 'none',
+ tex2jax: {
+ inlineMath: [ [ '$', '$' ], [ '\\(', '\\)' ] ],
+ skipTags: [ 'script', 'noscript', 'style', 'textarea', 'pre' ]
+ },
+ skipStartupTypeset: true
+ };
+
+ function defaults( options, defaultOptions ) {
+
+ for ( var i in defaultOptions ) {
+ if ( !options.hasOwnProperty( i ) ) {
+ options[i] = defaultOptions[i];
+ }
+ }
+
+ }
+
+ function loadScript( url, callback ) {
+
+ var head = document.querySelector( 'head' );
+ var script = document.createElement( 'script' );
+ script.type = 'text/javascript';
+ script.src = url;
+
+ // Wrapper for callback to make sure it only fires once
+ var finish = function() {
+ if( typeof callback === 'function' ) {
+ callback.call();
+ callback = null;
+ }
+ }
+
+ script.onload = finish;
+
+ // IE
+ script.onreadystatechange = function() {
+ if ( this.readyState === 'loaded' ) {
+ finish();
+ }
+ }
+
+ // Normal browsers
+ head.appendChild( script );
+
+ }
+
+ return {
+ init: function() {
+
+ defaults( options, defaultOptions );
+ defaults( options.tex2jax, defaultOptions.tex2jax );
+ options.mathjax = options.config = null;
+
+ loadScript( url, function() {
+
+ MathJax.Hub.Config( options );
+
+ // Typeset followed by an immediate reveal.js layout since
+ // the typesetting process could affect slide height
+ MathJax.Hub.Queue( [ 'Typeset', MathJax.Hub ] );
+ MathJax.Hub.Queue( Reveal.layout );
+
+ // Reprocess equations in slides when they turn visible
+ Reveal.addEventListener( 'slidechanged', function( event ) {
+
+ MathJax.Hub.Queue( [ 'Typeset', MathJax.Hub, event.currentSlide ] );
+
+ } );
+
+ } );
+
+ }
+ }
+
+})();
+
+Reveal.registerPlugin( 'math', RevealMath );