From 0ea419300162bfc78f294c22a12046028e6605a7 Mon Sep 17 00:00:00 2001
From: hakimel <hakim.elhattab@gmail.com>
Date: Thu, 28 Oct 2021 13:41:57 +0200
Subject: [PATCH] add @burgerga's math plugin with MathJax2, MathJax3 and KaTeX
 support #2559

---
 examples/math.html      |  11 +++--
 package-lock.json       |  12 ++---
 plugin/math/katex.js    |  87 +++++++++++++++++++++++++++++++++
 plugin/math/math.esm.js |   2 +-
 plugin/math/math.js     |   2 +-
 plugin/math/mathjax2.js |  89 ++++++++++++++++++++++++++++++++++
 plugin/math/mathjax3.js |  77 +++++++++++++++++++++++++++++
 plugin/math/plugin.js   | 104 ++++++----------------------------------
 8 files changed, 283 insertions(+), 101 deletions(-)
 create mode 100755 plugin/math/katex.js
 create mode 100644 plugin/math/mathjax2.js
 create mode 100644 plugin/math/mathjax3.js
 mode change 100755 => 100644 plugin/math/plugin.js

diff --git a/examples/math.html b/examples/math.html
index 5861a71..d27779a 100644
--- a/examples/math.html
+++ b/examples/math.html
@@ -182,8 +182,7 @@
 				history: true,
 				transition: 'linear',
 
-				math: {
-					// mathjax: 'https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js',
+				mathjax2: {
 					config: 'TeX-AMS_HTML-full',
 					TeX: {
 						Macros: {
@@ -193,7 +192,13 @@
 					}
 				},
 
-				plugins: [ RevealMath ]
+				// There are three typesetters available
+				// RevealMath.MathJax2 (default)
+				// RevealMath.MathJax3
+				// RevealMath.KaTeX
+				//
+				// More info at https://revealjs.com/math/
+				plugins: [ RevealMath.MathJax2 ]
 			});
 		</script>
 
diff --git a/package-lock.json b/package-lock.json
index f7039d4..96c9835 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2227,9 +2227,9 @@
       }
     },
     "node_modules/caniuse-lite": {
-      "version": "1.0.30001228",
-      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001228.tgz",
-      "integrity": "sha512-QQmLOGJ3DEgokHbMSA8cj2a+geXqmnpyOFT0lhQV6P3/YOJvGDEwoedcwxEQ30gJIwIIunHIicunJ2rzK5gB2A==",
+      "version": "1.0.30001272",
+      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001272.tgz",
+      "integrity": "sha512-DV1j9Oot5dydyH1v28g25KoVm7l8MTxazwuiH3utWiAS6iL/9Nh//TGwqFEeqqN8nnWYQ8HHhUq+o4QPt9kvYw==",
       "dev": true,
       "funding": {
         "type": "opencollective",
@@ -11296,9 +11296,9 @@
       "dev": true
     },
     "caniuse-lite": {
-      "version": "1.0.30001228",
-      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001228.tgz",
-      "integrity": "sha512-QQmLOGJ3DEgokHbMSA8cj2a+geXqmnpyOFT0lhQV6P3/YOJvGDEwoedcwxEQ30gJIwIIunHIicunJ2rzK5gB2A==",
+      "version": "1.0.30001272",
+      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001272.tgz",
+      "integrity": "sha512-DV1j9Oot5dydyH1v28g25KoVm7l8MTxazwuiH3utWiAS6iL/9Nh//TGwqFEeqqN8nnWYQ8HHhUq+o4QPt9kvYw==",
       "dev": true
     },
     "chalk": {
diff --git a/plugin/math/katex.js b/plugin/math/katex.js
new file mode 100755
index 0000000..29b05b7
--- /dev/null
+++ b/plugin/math/katex.js
@@ -0,0 +1,87 @@
+/**
+ * A plugin which enables rendering of math equations inside
+ * of reveal.js slides. Essentially a thin wrapper for KaTeX.
+ *
+ * @author Hakim El Hattab
+ * @author Gerhard Burger
+ */
+export const KaTeX = () => {
+	let deck;
+
+	let defaultOptions = {
+		version: 'latest',
+		delimiters: [
+			{left: '$', right: '$', display: false},
+			{left: '$$', right: '$$', display: true},
+			{left: '\\(', right: '\\)', display: false},
+			{left: '\\[', right: '\\]', display: true}
+		],
+		ignoredTags: ['script', 'noscript', 'style', 'textarea', 'pre']
+	}
+
+	const loadCss = src => {
+		let link = document.createElement('link');
+		link.rel = 'stylesheet';
+		link.href = src;
+		document.head.appendChild(link);
+	};
+
+	/**
+	 * Loads a JavaScript file and returns a Promise for when it is loaded
+	 * Credits: https://aaronsmith.online/easily-load-an-external-script-using-javascript/
+	 */
+	const loadScript = src => {
+		return new Promise((resolve, reject) => {
+			const script = document.createElement('script')
+			script.type = 'text/javascript'
+			script.onload = resolve
+			script.onerror = reject
+			script.src = src
+			document.head.append(script)
+		})
+	};
+
+	async function loadScripts(urls) {
+		for(const url of urls) {
+			await loadScript(url);
+		}
+	}
+
+	return {
+		id: 'katex',
+
+		init: function (reveal) {
+
+			deck = reveal;
+
+			let revealOptions = deck.getConfig().katex || {};
+
+			let options = {...defaultOptions, ...revealOptions};
+			const {local, version, extensions, ...katexOptions} = options;
+
+			let baseUrl = options.local || 'https://cdn.jsdelivr.net/npm/katex';
+			let versionString = options.local ? '' : '@' + options.version;
+
+			let cssUrl = baseUrl + versionString + '/dist/katex.min.css';
+			let katexUrl = baseUrl + versionString + '/dist/katex.min.js';
+			let mhchemUrl = baseUrl + versionString + '/dist/contrib/mhchem.min.js'
+			let karUrl = baseUrl + versionString + '/dist/contrib/auto-render.min.js';
+
+			let katexScripts = [katexUrl];
+			if(options.extensions && options.extensions.includes("mhchem")) {
+				katexScripts.push(mhchemUrl);
+			}
+			katexScripts.push(karUrl);
+
+			loadCss(cssUrl);
+
+			// For some reason dynamically loading with defer attribute doesn't result in the expected behavior, the below code does
+			loadScripts(katexScripts).then(() => {
+				renderMathInElement(document.body, katexOptions);
+				deck.layout();
+			});
+
+		}
+	}
+
+};
diff --git a/plugin/math/math.esm.js b/plugin/math/math.esm.js
index 716c114..90724e0 100644
--- a/plugin/math/math.esm.js
+++ b/plugin/math/math.esm.js
@@ -1 +1 @@
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diff --git a/plugin/math/math.js b/plugin/math/math.js
index 6c52bc5..a8b38be 100644
--- a/plugin/math/math.js
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aa(this,t,arguments.length>1?arguments[1]:void 0)}}),ca("includes");var ua=w,fa=p,sa=Cn("match"),la=function(t){var e;return ua(t)&&(void 0!==(e=t[sa])?!!e:"RegExp"==fa(t))},pa=Cn("match"),ha=function(t){if(la(t))throw TypeError("The method doesn't accept regular expressions");return t},da=y;qe({target:"String",proto:!0,forced:!function(t){var e=/./;try{"/./"[t](e)}catch(n){try{return e[pa]=!1,"/./"[t](e)}catch(t){}}return!1}("includes")},{includes:function(t){return!!~String(da(this)).indexOf(ha(t),arguments.length>1?arguments[1]:void 0)}});var va=function(){var t,e={messageStyle:"none",tex2jax:{inlineMath:[["$","$"],["\\(","\\)"]],skipTags:["script","noscript","style","textarea","pre"]},skipStartupTypeset:!0};return{id:"mathjax2",init:function(n){var r=(t=n).getConfig().mathjax2||t.getConfig().math||{},o=cn(cn({},e),r),i=(o.mathjax||"https://cdn.jsdelivr.net/npm/mathjax@2/MathJax.js")+"?config="+(o.config||"TeX-AMS_HTML-full");o.tex2jax=cn(cn({},e.tex2jax),r.tex2jax),o.mathjax=o.config=null,function(t,e){var n=this,r=document.querySelector("head"),o=document.createElement("script");o.type="text/javascript",o.src=t;var i=function(){"function"==typeof e&&(e.call(),e=null)};o.onload=i,o.onreadystatechange=function(){"loaded"===n.readyState&&i()},r.appendChild(o)}(i,(function(){MathJax.Hub.Config(o),MathJax.Hub.Queue(["Typeset",MathJax.Hub,t.getRevealElement()]),MathJax.Hub.Queue(t.layout),t.on("slidechanged",(function(t){MathJax.Hub.Queue(["Typeset",MathJax.Hub,t.currentSlide])}))}))}}},ya=va;return Plugin=Object.assign(ya(),{KaTeX:function(){var t,e={version:"latest",delimiters:[{left:"$",right:"$",display:!1},{left:"$$",right:"$$",display:!0},{left:"\\(",right:"\\)",display:!1},{left:"\\[",right:"\\]",display:!0}],ignoredTags:["script","noscript","style","textarea","pre"]},n=function(t){return new Promise((function(e,n){var r=document.createElement("script");r.type="text/javascript",r.onload=e,r.onerror=n,r.src=t,document.head.append(r)}))};function r(){return(r=fn(regeneratorRuntime.mark((function t(e){var r,o,i;return regeneratorRuntime.wrap((function(t){for(;;)switch(t.prev=t.next){case 0:r=hn(e),t.prev=1,r.s();case 3:if((o=r.n()).done){t.next=9;break}return i=o.value,t.next=7,n(i);case 7:t.next=3;break;case 9:t.next=14;break;case 11:t.prev=11,t.t0=t.catch(1),r.e(t.t0);case 14:return t.prev=14,r.f(),t.finish(14);case 17:case"end":return t.stop()}}),t,null,[[1,11,14,17]])})))).apply(this,arguments)}return{id:"katex",init:function(n){var o=(t=n).getConfig().katex||{},i=cn(cn({},e),o);i.local,i.version,i.extensions;var a,c,u=ln(i,["local","version","extensions"]),f=i.local||"https://cdn.jsdelivr.net/npm/katex",s=i.local?"":"@"+i.version,l=f+s+"/dist/katex.min.css",p=f+s+"/dist/contrib/mhchem.min.js",h=f+s+"/dist/contrib/auto-render.min.js",d=[f+s+"/dist/katex.min.js"];i.extensions&&i.extensions.includes("mhchem")&&d.push(p),d.push(h),a=l,(c=document.createElement("link")).rel="stylesheet",c.href=a,document.head.appendChild(c),function(t){return r.apply(this,arguments)}(d).then((function(){renderMathInElement(document.body,u),t.layout()}))}}},MathJax2:va,MathJax3:function(){var t={tex:{inlineMath:[["$","$"],["\\(","\\)"]]},options:{skipHtmlTags:["script","noscript","style","textarea","pre"]},startup:{ready:function(){MathJax.startup.defaultReady(),MathJax.startup.promise.then((function(){Reveal.layout()}))}}};return{id:"mathjax3",init:function(e){var n=e.getConfig().mathjax3||{},r=cn(cn({},t),n);r.tex=cn(cn({},t.tex),n.tex),r.options=cn(cn({},r.options),t.options),r.startup=cn(cn({},t.startup),n.startup);var o=r.mathjax||"https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js";r.mathjax=null,window.MathJax=r,function(t,e){var n=document.createElement("script");n.type="text/javascript",n.id="MathJax-script",n.src=t,n.async=!0,n.onload=function(){"function"==typeof e&&(e.call(),e=null)},document.head.appendChild(n)}(o,(function(){Reveal.addEventListener("slidechanged",(function(t){MathJax.typeset()}))}))}}}})}));
diff --git a/plugin/math/mathjax2.js b/plugin/math/mathjax2.js
new file mode 100644
index 0000000..daebe7e
--- /dev/null
+++ b/plugin/math/mathjax2.js
@@ -0,0 +1,89 @@
+/**
+ * A plugin which enables rendering of math equations inside
+ * of reveal.js slides. Essentially a thin wrapper for MathJax.
+ *
+ * @author Hakim El Hattab
+ */
+export const MathJax2 = () => {
+
+	// The reveal.js instance this plugin is attached to
+	let deck;
+
+	let defaultOptions = {
+		messageStyle: 'none',
+		tex2jax: {
+			inlineMath: [ [ '$', '$' ], [ '\\(', '\\)' ] ],
+			skipTags: [ 'script', 'noscript', 'style', 'textarea', 'pre' ]
+		},
+		skipStartupTypeset: true
+	};
+
+	function loadScript( url, callback ) {
+
+		let head = document.querySelector( 'head' );
+		let script = document.createElement( 'script' );
+		script.type = 'text/javascript';
+		script.src = url;
+
+		// Wrapper for callback to make sure it only fires once
+		let finish = () => {
+			if( typeof callback === 'function' ) {
+				callback.call();
+				callback = null;
+			}
+		}
+
+		script.onload = finish;
+
+		// IE
+		script.onreadystatechange = () => {
+			if ( this.readyState === 'loaded' ) {
+				finish();
+			}
+		}
+
+		// Normal browsers
+		head.appendChild( script );
+
+	}
+
+	return {
+		id: 'mathjax2',
+
+		init: function( reveal ) {
+
+			deck = reveal;
+
+			let revealOptions = deck.getConfig().mathjax2 || deck.getConfig().math || {};
+
+			let options = { ...defaultOptions, ...revealOptions };
+			let mathjax = options.mathjax || 'https://cdn.jsdelivr.net/npm/mathjax@2/MathJax.js';
+			let config = options.config || 'TeX-AMS_HTML-full';
+			let url = mathjax + '?config=' + config;
+
+			options.tex2jax = { ...defaultOptions.tex2jax, ...revealOptions.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, deck.getRevealElement() ] );
+				MathJax.Hub.Queue( deck.layout );
+
+				// Reprocess equations in slides when they turn visible
+				deck.on( 'slidechanged', function( event ) {
+
+					MathJax.Hub.Queue( [ 'Typeset', MathJax.Hub, event.currentSlide ] );
+
+				} );
+
+			} );
+
+		}
+	}
+
+};
diff --git a/plugin/math/mathjax3.js b/plugin/math/mathjax3.js
new file mode 100644
index 0000000..38eb4ef
--- /dev/null
+++ b/plugin/math/mathjax3.js
@@ -0,0 +1,77 @@
+/**
+ * A plugin which enables rendering of math equations inside
+ * of reveal.js slides. Essentially a thin wrapper for MathJax 3
+ *
+ * @author Hakim El Hattab
+ * @author Gerhard Burger
+ */
+export const MathJax3 = () => {
+
+    // The reveal.js instance this plugin is attached to
+    let deck;
+
+    let defaultOptions = {
+        tex: {
+            inlineMath: [ [ '$', '$' ], [ '\\(', '\\)' ]  ]
+        },
+        options: {
+            skipHtmlTags: [ 'script', 'noscript', 'style', 'textarea', 'pre' ]
+        },
+        startup: {
+            ready: () => {
+                MathJax.startup.defaultReady();
+                MathJax.startup.promise.then(() => {
+                    Reveal.layout();
+                });
+            }
+        }
+    };
+
+    function loadScript( url, callback ) {
+
+        let script = document.createElement( 'script' );
+        script.type = "text/javascript"
+        script.id = "MathJax-script"
+        script.src = url;
+        script.async = true
+
+        // Wrapper for callback to make sure it only fires once
+        script.onload = () => {
+            if (typeof callback === 'function') {
+                callback.call();
+                callback = null;
+            }
+        };
+
+        document.head.appendChild( script );
+
+    }
+
+    return {
+        id: 'mathjax3',
+        init: function(reveal) {
+
+            deck = reveal;
+
+            let revealOptions = deck.getConfig().mathjax3 || {};
+            let options = {...defaultOptions, ...revealOptions};
+            options.tex = {...defaultOptions.tex, ...revealOptions.tex}
+            options.options = {...options.options, ...defaultOptions.options}
+            options.startup = {...defaultOptions.startup, ...revealOptions.startup}
+
+            let url = options.mathjax || 'https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js';
+            options.mathjax = null;
+
+            window.MathJax = options;
+
+            loadScript( url, function() {
+                // Reprocess equations in slides when they turn visible
+                Reveal.addEventListener( 'slidechanged', function( event ) {
+                    MathJax.typeset();
+                } );
+            } );
+
+        }
+    }
+
+};
diff --git a/plugin/math/plugin.js b/plugin/math/plugin.js
old mode 100755
new mode 100644
index eaef379..a92ccfb
--- a/plugin/math/plugin.js
+++ b/plugin/math/plugin.js
@@ -1,91 +1,15 @@
-/**
- * A plugin which enables rendering of math equations inside
- * of reveal.js slides. Essentially a thin wrapper for MathJax.
- *
- * @author Hakim El Hattab
+import {KaTeX} from "./katex";
+import {MathJax2} from "./mathjax2";
+import {MathJax3} from "./mathjax3";
+
+const defaultTypesetter = MathJax2;
+
+/*!
+ * This plugin is a wrapper for the MathJax2,
+ * MathJax3 and KaTeX typesetter plugins.
  */
-const Plugin = () => {
-
-	// The reveal.js instance this plugin is attached to
-	let deck;
-
-	let defaultOptions = {
-		messageStyle: 'none',
-		tex2jax: {
-			inlineMath: [ [ '$', '$' ], [ '\\(', '\\)' ] ],
-			skipTags: [ 'script', 'noscript', 'style', 'textarea', 'pre' ]
-		},
-		skipStartupTypeset: true
-	};
-
-	function loadScript( url, callback ) {
-
-		let head = document.querySelector( 'head' );
-		let script = document.createElement( 'script' );
-		script.type = 'text/javascript';
-		script.src = url;
-
-		// Wrapper for callback to make sure it only fires once
-		let finish = () => {
-			if( typeof callback === 'function' ) {
-				callback.call();
-				callback = null;
-			}
-		}
-
-		script.onload = finish;
-
-		// IE
-		script.onreadystatechange = () => {
-			if ( this.readyState === 'loaded' ) {
-				finish();
-			}
-		}
-
-		// Normal browsers
-		head.appendChild( script );
-
-	}
-
-	return {
-		id: 'math',
-
-		init: function( reveal ) {
-
-			deck = reveal;
-
-			let revealOptions = deck.getConfig().math || {};
-
-			let options = { ...defaultOptions, ...revealOptions };
-			let mathjax = options.mathjax || 'https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js';
-			let config = options.config || 'TeX-AMS_HTML-full';
-			let url = mathjax + '?config=' + config;
-
-			options.tex2jax = { ...defaultOptions.tex2jax, ...revealOptions.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, deck.getRevealElement() ] );
-				MathJax.Hub.Queue( deck.layout );
-
-				// Reprocess equations in slides when they turn visible
-				deck.on( 'slidechanged', function( event ) {
-
-					MathJax.Hub.Queue( [ 'Typeset', MathJax.Hub, event.currentSlide ] );
-
-				} );
-
-			} );
-
-		}
-	}
-
-};
-
-export default Plugin;
+export default Plugin = Object.assign( defaultTypesetter(), {
+	KaTeX,
+	MathJax2,
+	MathJax3
+} );
\ No newline at end of file