copy-paste-bookmarks/plugin/highlight/highlight.js

/*! highlight.js v9.11.0 | BSD3 License | git.io/hljslicense */
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/* highlightjs-line-numbers.js 2.6.0 | (C) 2018 Yauheni Pakala | MIT License | github.com/wcoder/highlightjs-line-numbers.js */
!function(n,e){"use strict";function t(){var n=e.createElement("style");n.type="text/css",n.innerHTML=g(".{0}{border-collapse:collapse}.{0} td{padding:0}.{1}:before{content:attr({2})}",[v,L,b]),e.getElementsByTagName("head")[0].appendChild(n)}function r(t){"interactive"===e.readyState||"complete"===e.readyState?i(t):n.addEventListener("DOMContentLoaded",function(){i(t)})}function i(t){try{var r=e.querySelectorAll("code.hljs,code.nohighlight");for(var i in r)r.hasOwnProperty(i)&&l(r[i],t)}catch(o){n.console.error("LineNumbers error: ",o)}}function l(n,e){"object"==typeof n&&f(function(){n.innerHTML=s(n,e)})}function o(n,e){if("string"==typeof n){var t=document.createElement("code");return t.innerHTML=n,s(t,e)}}function s(n,e){e=e||{singleLine:!1};var t=e.singleLine?0:1;return c(n),a(n.innerHTML,t)}function a(n,e){var t=u(n);if(""===t[t.length-1].trim()&&t.pop(),t.length>e){for(var r="",i=0,l=t.length;i<l;i++)r+=g('<tr><td class="{0}"><div class="{1} {2}" {3}="{5}"></div></td><td class="{4}"><div class="{1}">{6}</div></td></tr>',[j,m,L,b,p,i+1,t[i].length>0?t[i]:" "]);return g('<table class="{0}">{1}</table>',[v,r])}return n}function c(n){var e=n.childNodes;for(var t in e)if(e.hasOwnProperty(t)){var r=e[t];h(r.textContent)>0&&(r.childNodes.length>0?c(r):d(r.parentNode))}}function d(n){var e=n.className;if(/hljs-/.test(e)){for(var t=u(n.innerHTML),r=0,i="";r<t.length;r++){var l=t[r].length>0?t[r]:" ";i+=g('<span class="{0}">{1}</span>\n',[e,l])}n.innerHTML=i.trim()}}function u(n){return 0===n.length?[]:n.split(y)}function h(n){return(n.trim().match(y)||[]).length}function f(e){n.setTimeout(e,0)}function g(n,e){return n.replace(/\{(\d+)\}/g,function(n,t){return e[t]?e[t]:n})}var v="hljs-ln",m="hljs-ln-line",p="hljs-ln-code",j="hljs-ln-numbers",L="hljs-ln-n",b="data-line-number",y=/\r\n|\r|\n/g;n.hljs?(n.hljs.initLineNumbersOnLoad=r,n.hljs.lineNumbersBlock=l,n.hljs.lineNumbersValue=o,t()):n.console.error("highlight.js not detected!")}(window,document);

// START CUSTOM REVEAL.JS INTEGRATION
var RevealHighlight = (function() {
	// Function to perform a better "data-trim" on code snippets
	// Will slice an indentation amount on each line of the snippet (amount based on the line having the lowest indentation length)
	function betterTrim(snippetEl) {
		// Helper functions
		function trimLeft(val) {
			// Adapted from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/Trim#Polyfill
			return val.replace(/^[\s\uFEFF\xA0]+/g, '');
		}
		function trimLineBreaks(input) {
			var lines = input.split('\n');

			// Trim line-breaks from the beginning
			for (var i = 0; i < lines.length; i++) {
				if (lines[i].trim() === '') {
					lines.splice(i--, 1);
				} else break;
			}

			// Trim line-breaks from the end
			for (var i = lines.length-1; i >= 0; i--) {
				if (lines[i].trim() === '') {
					lines.splice(i, 1);
				} else break;
			}

			return lines.join('\n');
		}

		// Main function for betterTrim()
		return (function(snippetEl) {
			var content = trimLineBreaks(snippetEl.innerHTML);
			var lines = content.split('\n');
			// Calculate the minimum amount to remove on each line start of the snippet (can be 0)
			var pad = lines.reduce(function(acc, line) {
				if (line.length > 0 && trimLeft(line).length > 0 && acc > line.length - trimLeft(line).length) {
					return line.length - trimLeft(line).length;
				}
				return acc;
			}, Number.POSITIVE_INFINITY);
			// Slice each line with this amount
			return lines.map(function(line, index) {
				return line.slice(pad);
			})
			.join('\n');
		})(snippetEl);
	}

	return {
		init: function() {

			[].slice.call( document.querySelectorAll( 'pre code' ) ).forEach( function( code ) {

				// trim whitespace if data-trim attribute is present
				if( code.hasAttribute( 'data-trim' ) && typeof code.innerHTML.trim === 'function' ) {
					code.innerHTML = betterTrim(code);
				}

				// Now escape html unless prevented by author
				if( ! code.hasAttribute( 'data-noescape' )) {
					code.innerHTML = code.innerHTML.replace(/</g,"&lt;").replace(/>/g,"&gt;");
				}

				// re-highlight when focus is lost (for edited code)
				code.addEventListener( 'focusout', function( event ) {
					hljs.highlightBlock( event.currentTarget );
				}, false );

				RevealHighlight.highlightBlock( code );
			} );

			// lofi xbrowser Promise.resolve()
			return { then: function( resolve ) { resolve(); }};

		},

		/**
		 * Highlights a code block. If the <code> node has the
		 * 'line-numbers' class we also generate slide numbers.
		 */
		highlightBlock: function( block ) {

			hljs.highlightBlock( block );

			if( block.classList.contains( 'line-numbers' ) ) {
				hljs.lineNumbersBlock( block );

				if( block.hasAttribute( 'data-highlight-lines' ) ) {
					// hljs.lineNumbersBlock runs async code on the next cycle,
					// so we need to do the same to execute after it's done
					setTimeout( RevealHighlight.highlightLines.bind( this, block ), 0 )
				}
			}

		},

		/**
		 * Visually emphasize specific lines within a code block.
		 * This onnly works on blocks with line numbering turned on.
		 *
		 * @param {HTMLElement} block a <code> block
		 * @param {String} [linesToHighlight] The lines that should be
		 * highlighted in this format:
		 * "1" 		= highlights line 1
		 * "2,5"	= highlights lines 2 & 5
		 * "2,5-7"	= highlights lines 2, 5, 6 & 7
		 */
		highlightLines: function( block, linesToHighlight ) {

			linesToHighlight = linesToHighlight || block.getAttribute( 'data-highlight-lines' );

			if( typeof linesToHighlight === 'string' ) {

				block.classList.add( 'highlight-lines' );

				linesToHighlight.split( ',' ).forEach( function( lineNumbers ) {

					lineNumbers = lineNumbers.split( '-' )

					var lineStart = lineNumbers[0];
					var lineEnd = lineNumbers[1] || lineStart;

					[].slice.call( block.querySelectorAll( 'table tr:nth-child(n+'+lineStart+'):nth-child(-n+'+lineEnd+')' ) ).forEach( function( lineElement ) {
						lineElement.classList.add( 'highlight-line' );
					} );

				} );

			}
			else {

				block.classList.remove( 'highlight-lines' );

			}

		}
	}
})();

Reveal.registerPlugin( 'highlight', RevealHighlight );
// END CUSTOM REVEAL.JS INTEGRATION