From 4cfd2540866a4e7d8f64b27839d8f971f6d0b823 Mon Sep 17 00:00:00 2001
From: Hakim El Hattab <hakim.elhattab@gmail.com>
Date: Sat, 7 Mar 2020 11:50:58 +0100
Subject: [PATCH] move out additional util methods, use shorthands for api

---
 demo.html          |   9 +-
 dist/reveal.min.js |   2 +-
 js/reveal.js       | 295 ++++-----------------------------------------
 js/utils/util.js   | 233 +++++++++++++++++++++++++++++++++++
 4 files changed, 266 insertions(+), 273 deletions(-)
 create mode 100644 js/utils/util.js

diff --git a/demo.html b/demo.html
index 0d797030..8249a0b7 100644
--- a/demo.html
+++ b/demo.html
@@ -406,9 +406,14 @@ Reveal.addEventListener( 'customevent', function() {
 
 		</div>
 
-		<script src="dist/reveal.min.js"></script>
+		<script type="module" src="js/index.js"></script>
 
-		<script>
+		<script type="module">
+
+			// WIP support for multiple reveal.js instances
+			// let a = new Reveal(document.querySelector( '.reveal' ), {controls: false});
+			// let b = new Reveal(document.querySelector( '.reveal' ), {controls: true});
+			// console.log(a.getConfig().controls,b.getConfig().controls);
 
 			// More info https://github.com/hakimel/reveal.js#configuration
 			Reveal.initialize({
diff --git a/dist/reveal.min.js b/dist/reveal.min.js
index 98333f7f..44ecb0a3 100644
--- a/dist/reveal.min.js
+++ b/dist/reveal.min.js
@@ -5,4 +5,4 @@
 *
 * Copyright (C) 2020 Hakim El Hattab, https://hakim.se
 */
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This is likely due to the site's policy (x-frame-options).</span>\n\t\t\t\t</small>\n\t\t\t</div>`,q.overlay.querySelector("iframe").addEventListener("load",e=>{q.overlay.classList.add("loaded")},!1),q.overlay.querySelector(".close").addEventListener("click",e=>{fe(),e.preventDefault()},!1),q.overlay.querySelector(".external").addEventListener("click",e=>{fe()},!1)}(t),e.preventDefault())}}function ra(e){a.isLastSlide()&&!1===c.loop?(Oe(0,0),Mt()):$?Mt():xt()}return a={VERSION:"4.0.0-dev",configure:G,sync:ze,syncSlide:function(e=f){Z(e),De(e),_e(e),Xe(),$e()},syncFragments:De,slide:Oe,left:Nt,right:qt,up:It,down:Pt,prev:Tt,next:Ct,navigateTo:Oe,navigateLeft:Nt,navigateRight:qt,navigateUp:It,navigateDown:Pt,navigatePrev:Tt,navigateNext:Ct,navigateFragment:At,prevFragment:St,nextFragment:kt,layout:ge,shuffle:Be,availableRoutes:Qe,availableFragments:Ze,toggleHelp:pe,toggleOverview:Ee,togglePause:Te,toggleAutoSlide:Re,isOverview:Le,isPaused:Ce,isAutoSliding:function(){return!(!B||$)},isSpeakerNotes:it,loadSlide:_e,unloadSlide:Je,addEventListeners:ee,removeEventListeners:te,getState:yt,setState:function(e){if("object"==typeof e){Oe(deserialize(e.indexh),deserialize(e.indexv),deserialize(e.indexf));var t=deserialize(e.paused),a=deserialize(e.overview);"boolean"==typeof t&&t!==Ce()&&Te(t),"boolean"==typeof a&&a!==Le()&&Ee(a)}},getSlidePastCount:nt,getProgress:rt,getIndices:lt,getSlides:dt,getSlidesAttributes:function(){return dt().map((function(e){let t={};for(let a=0;a<e.attributes.length;a++){let n=e.attributes[a];t[n.name]=n.value}return t}))},getTotalSlides:ft,getSlide:gt,getSlideBackground:mt,getSlideNotes:vt,getHorizontalSlides:ct,getVerticalSlides:ut,hasHorizontalSlides:pt,hasVerticalSlides:ht,addKeyBinding:function(e,t){"object"==typeof e&&e.keyCode?V[e.keyCode]={callback:t,key:e.key,description:e.description}:V[e]={callback:t,key:null,description:null}},removeKeyBinding:function(e){delete V[e]},registerPlugin:function(e,t){void 0===I[e]?(I[e]=t,w&&"function"==typeof t.init&&t.init()):console.warn('reveal.js: "'+e+'" plugin has already been registered')},hasPlugin:function(e){return!!I[e]},getPlugin:function(e){return I[e]},getComputedSlideSize:ve,getPreviousSlide:()=>h,getCurrentSlide:()=>f,getScale:()=>M,getConfig:()=>c,getQueryHash:()=>{let e={};location.search.replace(/[A-Z0-9]+?=([\w\.%-]*)/gi,t=>{e[t.split("=").shift()]=t.split("=").pop()});for(let t in e){let a=e[t];e[t]=deserialize(unescape(a))}return e},getRevealElement:()=>q.wrapper||document.querySelector(".reveal"),getPlugins:()=>I,isFirstSlide:()=>0===u&&0===p,isLastSlide:()=>!!f&&(!f.nextElementSibling&&(!Me(f)||!f.parentNode.nextElementSibling)),isLastVerticalSlide:()=>!(!f||!Me(f))&&!f.nextElementSibling,isReady:()=>w,addEventListener:(e,t,n)=>{"addEventListener"in window&&a.getRevealElement().addEventListener(e,t,n)},removeEventListener:(e,t,n)=>{"addEventListener"in window&&a.getRevealElement().removeEventListener(e,t,n)},triggerKey:e=>{Bt({keyCode:e})},registerKeyboardShortcut:(e,t)=>{U[e]=t}},function(){if(!e)return void console.warn("reveal.js must be instantiated with a valid .reveal element");!function(){m=/(iphone|ipod|ipad|android)/gi.test(l)||"MacIntel"===navigator.platform&&navigator.maxTouchPoints>1,v=/chrome/i.test(l)&&!/edge/i.test(l);let e=document.createElement("div");T.zoom="zoom"in e.style&&!m&&(v||/Version\/[\d\.]+.*Safari/.test(l))}(),q.wrapper=e,q.slides=e.querySelector(".slides"),window.addEventListener("load",ge,!1);let n=a.getQueryHash();var i,o;return void 0!==n.dependencies&&delete n.dependencies,c={...r,...t,...n},i=[],o=0,c.dependencies.forEach(e=>{e.condition&&!e.condition()||(e.async?P.push(e):i.push(e))}),i.length?(o=i.length,i.forEach(e=>{Y(e.src,(function(){"function"==typeof e.callback&&e.callback(),0==--o&&F()}))})):F(),a}()};window.Reveal=h,window.Reveal.initialize=e=>{window.Reveal=new h(document.querySelector(".reveal"),e)}}]);
\ No newline at end of file
diff --git a/js/reveal.js b/js/reveal.js
index e73cca97..03bd833d 100644
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -1,5 +1,17 @@
 import Playback from './components/playback.js'
 import defaultConfig from './config.js'
+import {
+	extend,
+	toArray,
+	distanceBetween,
+	deserialize,
+	transformElement,
+	injectStyleSheet,
+	closestParent,
+	colorToRgb,
+	colorBrightness,
+	enterFullscreen
+} from './utils/util.js'
 
 /**
  * reveal.js
@@ -1350,84 +1362,6 @@ export default function( revealElement, options ) {
 
 	}
 
-	/**
-	 * Extend object a with the properties of object b.
-	 * If there's a conflict, object b takes precedence.
-	 *
-	 * @param {object} a
-	 * @param {object} b
-	 */
-	function extend( a, b ) {
-
-		for( var i in b ) {
-			a[ i ] = b[ i ];
-		}
-
-		return a;
-
-	}
-
-	/**
-	 * Converts the target object to an array.
-	 *
-	 * @param {object} o
-	 * @return {object[]}
-	 */
-	function toArray( o ) {
-
-		return Array.prototype.slice.call( o );
-
-	}
-
-	/**
-	 * Utility for deserializing a value.
-	 *
-	 * @param {*} value
-	 * @return {*}
-	 */
-	function deserialize( value ) {
-
-		if( typeof value === 'string' ) {
-			if( value === 'null' ) return null;
-			else if( value === 'true' ) return true;
-			else if( value === 'false' ) return false;
-			else if( value.match( /^-?[\d\.]+$/ ) ) return parseFloat( value );
-		}
-
-		return value;
-
-	}
-
-	/**
-	 * Measures the distance in pixels between point a
-	 * and point b.
-	 *
-	 * @param {object} a point with x/y properties
-	 * @param {object} b point with x/y properties
-	 *
-	 * @return {number}
-	 */
-	function distanceBetween( a, b ) {
-
-		var dx = a.x - b.x,
-			dy = a.y - b.y;
-
-		return Math.sqrt( dx*dx + dy*dy );
-
-	}
-
-	/**
-	 * Applies a CSS transform to the target element.
-	 *
-	 * @param {HTMLElement} element
-	 * @param {string} transform
-	 */
-	function transformElement( element, transform ) {
-
-		element.style.transform = transform;
-
-	}
-
 	/**
 	 * Applies CSS transforms to the slides container. The container
 	 * is transformed from two separate sources: layout and the overview
@@ -1451,139 +1385,6 @@ export default function( revealElement, options ) {
 
 	}
 
-	/**
-	 * Injects the given CSS styles into the DOM.
-	 *
-	 * @param {string} value
-	 */
-	function injectStyleSheet( value ) {
-
-		let tag = document.createElement( 'style' );
-		tag.type = 'text/css';
-		if( tag.styleSheet ) {
-			tag.styleSheet.cssText = value;
-		}
-		else {
-			tag.appendChild( document.createTextNode( value ) );
-		}
-		document.getElementsByTagName( 'head' )[0].appendChild( tag );
-
-	}
-
-	/**
-	 * Find the closest parent that matches the given
-	 * selector.
-	 *
-	 * @param {HTMLElement} target The child element
-	 * @param {String} selector The CSS selector to match
-	 * the parents against
-	 *
-	 * @return {HTMLElement} The matched parent or null
-	 * if no matching parent was found
-	 */
-	function closestParent( target, selector ) {
-
-		let parent = target.parentNode;
-
-		while( parent ) {
-
-			// There's some overhead doing this each time, we don't
-			// want to rewrite the element prototype but should still
-			// be enough to feature detect once at startup...
-			let matchesMethod = parent.matches || parent.matchesSelector || parent.msMatchesSelector;
-
-			// If we find a match, we're all set
-			if( matchesMethod && matchesMethod.call( parent, selector ) ) {
-				return parent;
-			}
-
-			// Keep searching
-			parent = parent.parentNode;
-
-		}
-
-		return null;
-
-	}
-
-	/**
-	 * Converts various color input formats to an {r:0,g:0,b:0} object.
-	 *
-	 * @param {string} color The string representation of a color
-	 * @example
-	 * colorToRgb('#000');
-	 * @example
-	 * colorToRgb('#000000');
-	 * @example
-	 * colorToRgb('rgb(0,0,0)');
-	 * @example
-	 * colorToRgb('rgba(0,0,0)');
-	 *
-	 * @return {{r: number, g: number, b: number, [a]: number}|null}
-	 */
-	function colorToRgb( color ) {
-
-		let hex3 = color.match( /^#([0-9a-f]{3})$/i );
-		if( hex3 && hex3[1] ) {
-			hex3 = hex3[1];
-			return {
-				r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,
-				g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,
-				b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11
-			};
-		}
-
-		let hex6 = color.match( /^#([0-9a-f]{6})$/i );
-		if( hex6 && hex6[1] ) {
-			hex6 = hex6[1];
-			return {
-				r: parseInt( hex6.substr( 0, 2 ), 16 ),
-				g: parseInt( hex6.substr( 2, 2 ), 16 ),
-				b: parseInt( hex6.substr( 4, 2 ), 16 )
-			};
-		}
-
-		let rgb = color.match( /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i );
-		if( rgb ) {
-			return {
-				r: parseInt( rgb[1], 10 ),
-				g: parseInt( rgb[2], 10 ),
-				b: parseInt( rgb[3], 10 )
-			};
-		}
-
-		let rgba = color.match( /^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i );
-		if( rgba ) {
-			return {
-				r: parseInt( rgba[1], 10 ),
-				g: parseInt( rgba[2], 10 ),
-				b: parseInt( rgba[3], 10 ),
-				a: parseFloat( rgba[4] )
-			};
-		}
-
-		return null;
-
-	}
-
-	/**
-	 * Calculates brightness on a scale of 0-255.
-	 *
-	 * @param {string} color See colorToRgb for supported formats.
-	 * @see {@link colorToRgb}
-	 */
-	function colorBrightness( color ) {
-
-		if( typeof color === 'string' ) color = colorToRgb( color );
-
-		if( color ) {
-			return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
-		}
-
-		return null;
-
-	}
-
 	/**
 	 * Returns the remaining height within the parent of the
 	 * target element.
@@ -2293,29 +2094,6 @@ export default function( revealElement, options ) {
 
 	}
 
-	/**
-	 * Handling the fullscreen functionality via the fullscreen API
-	 *
-	 * @see http://fullscreen.spec.whatwg.org/
-	 * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
-	 */
-	function enterFullscreen() {
-
-		let element = document.documentElement;
-
-		// Check which implementation is available
-		let requestMethod = element.requestFullscreen ||
-							element.webkitRequestFullscreen ||
-							element.webkitRequestFullScreen ||
-							element.mozRequestFullScreen ||
-							element.msRequestFullscreen;
-
-		if( requestMethod ) {
-			requestMethod.apply( element );
-		}
-
-	}
-
 	/**
 	 * Shows the mouse pointer after it has been hidden with
 	 * #hideCursor.
@@ -4541,6 +4319,7 @@ export default function( revealElement, options ) {
 		}
 
 	}
+
 	/**
 	 * Retrieves the h/v location and fragment of the current,
 	 * or specified, slide.
@@ -6015,24 +5794,16 @@ export default function( revealElement, options ) {
 		getComputedSlideSize,
 
 		// Returns the previous slide element, may be null
-		getPreviousSlide: () => {
-			return previousSlide;
-		},
+		getPreviousSlide: () => previousSlide,
 
 		// Returns the current slide element
-		getCurrentSlide: () => {
-			return currentSlide;
-		},
+		getCurrentSlide: () => currentSlide,
 
 		// Returns the current scale of the presentation content
-		getScale: () => {
-			return scale;
-		},
+		getScale: () => scale,
 
 		// Returns the current configuration object
-		getConfig: () => {
-			return config;
-		},
+		getConfig: () => config,
 
 		// Helper method, retrieves query string as a key/value hash
 		getQueryHash: () => {
@@ -6053,19 +5824,13 @@ export default function( revealElement, options ) {
 		},
 
 		// Returns the top-level DOM element
-		getRevealElement: () => {
-			return dom.wrapper || document.querySelector( '.reveal' );
-		},
+		getRevealElement: () => dom.wrapper || document.querySelector( '.reveal' ),
 
 		// Returns a hash with all registered plugins
-		getPlugins: () => {
-			return plugins;
-		},
+		getPlugins: () => plugins,
 
 		// Returns true if we're currently on the first slide
-		isFirstSlide: () => {
-			return indexh === 0 && indexv === 0;
-		},
+		isFirstSlide: () => indexh === 0 && indexv === 0,
 
 		// Returns true if we're currently on the last slide
 		isLastSlide: () => {
@@ -6096,31 +5861,21 @@ export default function( revealElement, options ) {
 		},
 
 		// Checks if reveal.js has been loaded and is ready for use
-		isReady: () => {
-			return loaded;
-		},
+		isReady: () => loaded,
 
 		// Forward event binding to the reveal DOM element
 		addEventListener: ( type, listener, useCapture ) => {
-			if( 'addEventListener' in window ) {
-				Reveal.getRevealElement().addEventListener( type, listener, useCapture );
-			}
+			Reveal.getRevealElement().addEventListener( type, listener, useCapture );
 		},
 		removeEventListener: ( type, listener, useCapture ) => {
-			if( 'addEventListener' in window ) {
-				Reveal.getRevealElement().removeEventListener( type, listener, useCapture );
-			}
+			Reveal.getRevealElement().removeEventListener( type, listener, useCapture );
 		},
 
 		// Programmatically triggers a keyboard event
-		triggerKey: keyCode => {
-			onDocumentKeyDown( { keyCode } );
-		},
+		triggerKey: keyCode => onDocumentKeyDown( { keyCode } ),
 
 		// Registers a new shortcut to include in the help overlay
-		registerKeyboardShortcut: ( key, value ) => {
-			keyboardShortcuts[key] = value;
-		}
+		registerKeyboardShortcut: ( key, value ) => keyboardShortcuts[key] = value
 	};
 
 	return init();
diff --git a/js/utils/util.js b/js/utils/util.js
new file mode 100644
index 00000000..8a3f3e3a
--- /dev/null
+++ b/js/utils/util.js
@@ -0,0 +1,233 @@
+/**
+ * Extend object a with the properties of object b.
+ * If there's a conflict, object b takes precedence.
+ *
+ * @param {object} a
+ * @param {object} b
+ */
+export const extend = ( a, b ) => {
+
+	for( var i in b ) {
+		a[ i ] = b[ i ];
+	}
+
+	return a;
+
+}
+
+/**
+ * Converts the target object to an array.
+ *
+ * @param {object} o
+ * @return {object[]}
+ */
+export const toArray = ( o ) => {
+
+	return Array.prototype.slice.call( o );
+
+}
+
+/**
+ * Utility for deserializing a value.
+ *
+ * @param {*} value
+ * @return {*}
+ */
+export const deserialize = ( value ) => {
+
+	if( typeof value === 'string' ) {
+		if( value === 'null' ) return null;
+		else if( value === 'true' ) return true;
+		else if( value === 'false' ) return false;
+		else if( value.match( /^-?[\d\.]+$/ ) ) return parseFloat( value );
+	}
+
+	return value;
+
+}
+
+/**
+ * Measures the distance in pixels between point a
+ * and point b.
+ *
+ * @param {object} a point with x/y properties
+ * @param {object} b point with x/y properties
+ *
+ * @return {number}
+ */
+export const distanceBetween = ( a, b ) => {
+
+	var dx = a.x - b.x,
+		dy = a.y - b.y;
+
+	return Math.sqrt( dx*dx + dy*dy );
+
+}
+
+/**
+ * Applies a CSS transform to the target element.
+ *
+ * @param {HTMLElement} element
+ * @param {string} transform
+ */
+export const transformElement = ( element, transform ) => {
+
+	element.style.transform = transform;
+
+}
+
+/**
+ * Injects the given CSS styles into the DOM.
+ *
+ * @param {string} value
+ */
+export const injectStyleSheet = ( value ) => {
+
+	let tag = document.createElement( 'style' );
+	tag.type = 'text/css';
+	if( tag.styleSheet ) {
+		tag.styleSheet.cssText = value;
+	}
+	else {
+		tag.appendChild( document.createTextNode( value ) );
+	}
+	document.getElementsByTagName( 'head' )[0].appendChild( tag );
+
+}
+
+/**
+ * Find the closest parent that matches the given
+ * selector.
+ *
+ * @param {HTMLElement} target The child element
+ * @param {String} selector The CSS selector to match
+ * the parents against
+ *
+ * @return {HTMLElement} The matched parent or null
+ * if no matching parent was found
+ */
+export const closestParent = ( target, selector ) => {
+
+	let parent = target.parentNode;
+
+	while( parent ) {
+
+		// There's some overhead doing this each time, we don't
+		// want to rewrite the element prototype but should still
+		// be enough to feature detect once at startup...
+		let matchesMethod = parent.matches || parent.matchesSelector || parent.msMatchesSelector;
+
+		// If we find a match, we're all set
+		if( matchesMethod && matchesMethod.call( parent, selector ) ) {
+			return parent;
+		}
+
+		// Keep searching
+		parent = parent.parentNode;
+
+	}
+
+	return null;
+
+}
+
+/**
+ * Converts various color input formats to an {r:0,g:0,b:0} object.
+ *
+ * @param {string} color The string representation of a color
+ * @example
+ * colorToRgb('#000');
+ * @example
+ * colorToRgb('#000000');
+ * @example
+ * colorToRgb('rgb(0,0,0)');
+ * @example
+ * colorToRgb('rgba(0,0,0)');
+ *
+ * @return {{r: number, g: number, b: number, [a]: number}|null}
+ */
+export const colorToRgb = ( color ) => {
+
+	let hex3 = color.match( /^#([0-9a-f]{3})$/i );
+	if( hex3 && hex3[1] ) {
+		hex3 = hex3[1];
+		return {
+			r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,
+			g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,
+			b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11
+		};
+	}
+
+	let hex6 = color.match( /^#([0-9a-f]{6})$/i );
+	if( hex6 && hex6[1] ) {
+		hex6 = hex6[1];
+		return {
+			r: parseInt( hex6.substr( 0, 2 ), 16 ),
+			g: parseInt( hex6.substr( 2, 2 ), 16 ),
+			b: parseInt( hex6.substr( 4, 2 ), 16 )
+		};
+	}
+
+	let rgb = color.match( /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i );
+	if( rgb ) {
+		return {
+			r: parseInt( rgb[1], 10 ),
+			g: parseInt( rgb[2], 10 ),
+			b: parseInt( rgb[3], 10 )
+		};
+	}
+
+	let rgba = color.match( /^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i );
+	if( rgba ) {
+		return {
+			r: parseInt( rgba[1], 10 ),
+			g: parseInt( rgba[2], 10 ),
+			b: parseInt( rgba[3], 10 ),
+			a: parseFloat( rgba[4] )
+		};
+	}
+
+	return null;
+
+}
+
+/**
+ * Calculates brightness on a scale of 0-255.
+ *
+ * @param {string} color See colorToRgb for supported formats.
+ * @see {@link colorToRgb}
+ */
+export const colorBrightness = ( color ) => {
+
+	if( typeof color === 'string' ) color = colorToRgb( color );
+
+	if( color ) {
+		return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
+	}
+
+	return null;
+
+}
+
+/**
+ * Handling the fullscreen functionality via the fullscreen API
+ *
+ * @see http://fullscreen.spec.whatwg.org/
+ * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
+ */
+export const enterFullscreen = () => {
+
+	let element = document.documentElement;
+
+	// Check which implementation is available
+	let requestMethod = element.requestFullscreen ||
+						element.webkitRequestFullscreen ||
+						element.webkitRequestFullScreen ||
+						element.mozRequestFullScreen ||
+						element.msRequestFullscreen;
+
+	if( requestMethod ) {
+		requestMethod.apply( element );
+	}
+
+}
\ No newline at end of file