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| import hljs from 'highlight.js'; | |
| /* highlightjs-line-numbers.js 2.8.0 | (C) 2018 Yauheni Pakala | MIT License | github.com/wcoder/highlightjs-line-numbers.js */ | |
| !function(r,o){"use strict";var e,i="hljs-ln",l="hljs-ln-line",h="hljs-ln-code",s="hljs-ln-numbers",c="hljs-ln-n",m="data-line-number",a=/\r\n|\r|\n/g;function u(e){for(var n=e.toString(),t=e.anchorNode;"TD"!==t.nodeName;)t=t.parentNode;for(var r=e.focusNode;"TD"!==r.nodeName;)r=r.parentNode;var o=parseInt(t.dataset.lineNumber),a=parseInt(r.dataset.lineNumber);if(o==a)return n;var i,l=t.textContent,s=r.textContent;for(a<o&&(i=o,o=a,a=i,i=l,l=s,s=i);0!==n.indexOf(l);)l=l.slice(1);for(;-1===n.lastIndexOf(s);)s=s.slice(0,-1);for(var c=l,u=function(e){for(var n=e;"TABLE"!==n.nodeName;)n=n.parentNode;return n}(t),d=o+1;d<a;++d){var f=p('.{0}[{1}="{2}"]',[h,m,d]);c+="\n"+u.querySelector(f).textContent}return c+="\n"+s}function n(e){try{var n=o.querySelectorAll("code.hljs,code.nohighlight");for(var t in n)n.hasOwnProperty(t)&&(n[t].classList.contains("nohljsln")||d(n[t],e))}catch(e){r.console.error("LineNumbers error: ",e)}}function d(e,n){if("object"==typeof e)e.innerHTML=f(e,n)}function f(e,n){var t,r,o=(t=e,{singleLine:function(e){return!!e.singleLine&&e.singleLine}(r=(r=n)||{}),startFrom:function(e,n){var t=1;isFinite(n.startFrom)&&(t=n.startFrom);var r=function(e,n){return e.hasAttribute(n)?e.getAttribute(n):null}(e,"data-ln-start-from");return null!==r&&(t=function(e,n){if(!e)return n;var t=Number(e);return isFinite(t)?t:n}(r,1)),t}(t,r)});return function e(n){var t=n.childNodes;for(var r in t){var o;t.hasOwnProperty(r)&&(o=t[r],0<(o.textContent.trim().match(a)||[]).length&&(0<o.childNodes.length?e(o):v(o.parentNode)))}}(e),function(e,n){var t=g(e);""===t[t.length-1].trim()&&t.pop();if(1<t.length||n.singleLine){for(var r="",o=0,a=t.length;o<a;o++)r+=p('<tr><td class="{0} {1}" {3}="{5}"><div class="{2}" {3}="{5}"></div></td><td class="{0} {4}" {3}="{5}">{6}</td></tr>',[l,s,c,m,h,o+n.startFrom,0<t[o].length?t[o]:" "]);return p('<table class="{0}">{1}</table>',[i,r])}return e}(e.innerHTML,o)}function v(e){var n=e.className;if(/hljs-/.test(n)){for(var t=g(e.innerHTML),r=0,o="";r<t.length;r++){o+=p('<span class="{0}">{1}</span>\n',[n,0<t[r].length?t[r]:" "])}e.innerHTML=o.trim()}}function g(e){return 0===e.length?[]:e.split(a)}function p(e,t){return e.replace(/\{(\d+)\}/g,function(e,n){return void 0!==t[n]?t[n]:e})}hljs?(hljs.initLineNumbersOnLoad=function(e){"interactive"===o.readyState||"complete"===o.readyState?n(e):r.addEventListener("DOMContentLoaded",function(){n(e)})},hljs.lineNumbersBlock=d,hljs.lineNumbersValue=function(e,n){if("string"!=typeof e)return;var t=document.createElement("code");return t.innerHTML=e,f(t,n)},(e=o.createElement("style")).type="text/css",e.innerHTML=p(".{0}{border-collapse:collapse}.{0} td{padding:0}.{1}:before{content:attr({2})}",[i,c,m]),o.getElementsByTagName("head")[0].appendChild(e)):r.console.error("highlight.js not detected!"),document.addEventListener("copy",function(e){var n,t=window.getSelection();!function(e){for(var n=e;n;){if(n.className&&-1!==n.className.indexOf("hljs-ln-code"))return 1;n=n.parentNode}}(t.anchorNode)||(n=-1!==window.navigator.userAgent.indexOf("Edge")?u(t):t.toString(),e.clipboardData.setData("text/plain",n),e.preventDefault())})}(window,document); | |
| /*! | |
| * reveal.js plugin that adds syntax highlight support. | |
| */ | |
| const Plugin = { | |
| id: 'highlight', | |
| HIGHLIGHT_STEP_DELIMITER: '|', | |
| HIGHLIGHT_LINE_DELIMITER: ',', | |
| HIGHLIGHT_LINE_RANGE_DELIMITER: '-', | |
| hljs, | |
| /** | |
| * Highlights code blocks withing the given deck. | |
| * | |
| * Note that this can be called multiple times if | |
| * there are multiple presentations on one page. | |
| * | |
| * @param {Reveal} reveal the reveal.js instance | |
| */ | |
| init: function( reveal ) { | |
| // Read the plugin config options and provide fallbacks | |
| let config = reveal.getConfig().highlight || {}; | |
| config.highlightOnLoad = typeof config.highlightOnLoad === 'boolean' ? config.highlightOnLoad : true; | |
| config.escapeHTML = typeof config.escapeHTML === 'boolean' ? config.escapeHTML : true; | |
| Array.from( reveal.getRevealElement().querySelectorAll( 'pre code' ) ).forEach( block => { | |
| block.parentNode.classList.add('code-wrapper'); | |
| // Code can optionally be wrapped in script template to avoid | |
| // HTML being parsed by the browser (i.e. when you need to | |
| // include <, > or & in your code). | |
| let substitute = block.querySelector( 'script[type="text/template"]' ); | |
| if( substitute ) { | |
| // textContent handles the HTML entity escapes for us | |
| block.textContent = substitute.innerHTML; | |
| } | |
| // Trim whitespace if the "data-trim" attribute is present | |
| if( block.hasAttribute( 'data-trim' ) && typeof block.innerHTML.trim === 'function' ) { | |
| block.innerHTML = betterTrim( block ); | |
| } | |
| // Escape HTML tags unless the "data-noescape" attrbute is present | |
| if( config.escapeHTML && !block.hasAttribute( 'data-noescape' )) { | |
| block.innerHTML = block.innerHTML.replace( /</g,"<").replace(/>/g, '>' ); | |
| } | |
| // Re-highlight when focus is lost (for contenteditable code) | |
| block.addEventListener( 'focusout', function( event ) { | |
| hljs.highlightElement( event.currentTarget ); | |
| }, false ); | |
| } ); | |
| // Triggers a callback function before we trigger highlighting | |
| if( typeof config.beforeHighlight === 'function' ) { | |
| config.beforeHighlight( hljs ); | |
| } | |
| // Run initial highlighting for all code | |
| if( config.highlightOnLoad ) { | |
| Array.from( reveal.getRevealElement().querySelectorAll( 'pre code' ) ).forEach( block => { | |
| Plugin.highlightBlock( block ); | |
| } ); | |
| } | |
| // If we're printing to PDF, scroll the code highlights of | |
| // all blocks in the deck into view at once | |
| reveal.on( 'pdf-ready', function() { | |
| [].slice.call( reveal.getRevealElement().querySelectorAll( 'pre code[data-line-numbers].current-fragment' ) ).forEach( function( block ) { | |
| Plugin.scrollHighlightedLineIntoView( block, {}, true ); | |
| } ); | |
| } ); | |
| }, | |
| /** | |
| * Highlights a code block. If the <code> node has the | |
| * 'data-line-numbers' attribute we also generate slide | |
| * numbers. | |
| * | |
| * If the block contains multiple line highlight steps, | |
| * we clone the block and create a fragment for each step. | |
| */ | |
| highlightBlock: function( block ) { | |
| hljs.highlightElement( block ); | |
| // Don't generate line numbers for empty code blocks | |
| if( block.innerHTML.trim().length === 0 ) return; | |
| if( block.hasAttribute( 'data-line-numbers' ) ) { | |
| hljs.lineNumbersBlock( block, { singleLine: true } ); | |
| var scrollState = { currentBlock: block }; | |
| // If there is more than one highlight step, generate | |
| // fragments | |
| var highlightSteps = Plugin.deserializeHighlightSteps( block.getAttribute( 'data-line-numbers' ) ); | |
| if( highlightSteps.length > 1 ) { | |
| // If the original code block has a fragment-index, | |
| // each clone should follow in an incremental sequence | |
| var fragmentIndex = parseInt( block.getAttribute( 'data-fragment-index' ), 10 ); | |
| if( typeof fragmentIndex !== 'number' || isNaN( fragmentIndex ) ) { | |
| fragmentIndex = null; | |
| } | |
| // Generate fragments for all steps except the original block | |
| highlightSteps.slice(1).forEach( function( highlight ) { | |
| var fragmentBlock = block.cloneNode( true ); | |
| fragmentBlock.setAttribute( 'data-line-numbers', Plugin.serializeHighlightSteps( [ highlight ] ) ); | |
| fragmentBlock.classList.add( 'fragment' ); | |
| block.parentNode.appendChild( fragmentBlock ); | |
| Plugin.highlightLines( fragmentBlock ); | |
| if( typeof fragmentIndex === 'number' ) { | |
| fragmentBlock.setAttribute( 'data-fragment-index', fragmentIndex ); | |
| fragmentIndex += 1; | |
| } | |
| else { | |
| fragmentBlock.removeAttribute( 'data-fragment-index' ); | |
| } | |
| // Scroll highlights into view as we step through them | |
| fragmentBlock.addEventListener( 'visible', Plugin.scrollHighlightedLineIntoView.bind( Plugin, fragmentBlock, scrollState ) ); | |
| fragmentBlock.addEventListener( 'hidden', Plugin.scrollHighlightedLineIntoView.bind( Plugin, fragmentBlock.previousSibling, scrollState ) ); | |
| } ); | |
| block.removeAttribute( 'data-fragment-index' ); | |
| block.setAttribute( 'data-line-numbers', Plugin.serializeHighlightSteps( [ highlightSteps[0] ] ) ); | |
| } | |
| // Scroll the first highlight into view when the slide | |
| // becomes visible. Note supported in IE11 since it lacks | |
| // support for Element.closest. | |
| var slide = typeof block.closest === 'function' ? block.closest( 'section:not(.stack)' ) : null; | |
| if( slide ) { | |
| var scrollFirstHighlightIntoView = function() { | |
| Plugin.scrollHighlightedLineIntoView( block, scrollState, true ); | |
| slide.removeEventListener( 'visible', scrollFirstHighlightIntoView ); | |
| } | |
| slide.addEventListener( 'visible', scrollFirstHighlightIntoView ); | |
| } | |
| Plugin.highlightLines( block ); | |
| } | |
| }, | |
| /** | |
| * Animates scrolling to the first highlighted line | |
| * in the given code block. | |
| */ | |
| scrollHighlightedLineIntoView: function( block, scrollState, skipAnimation ) { | |
| cancelAnimationFrame( scrollState.animationFrameID ); | |
| // Match the scroll position of the currently visible | |
| // code block | |
| if( scrollState.currentBlock ) { | |
| block.scrollTop = scrollState.currentBlock.scrollTop; | |
| } | |
| // Remember the current code block so that we can match | |
| // its scroll position when showing/hiding fragments | |
| scrollState.currentBlock = block; | |
| var highlightBounds = this.getHighlightedLineBounds( block ) | |
| var viewportHeight = block.offsetHeight; | |
| // Subtract padding from the viewport height | |
| var blockStyles = getComputedStyle( block ); | |
| viewportHeight -= parseInt( blockStyles.paddingTop ) + parseInt( blockStyles.paddingBottom ); | |
| // Scroll position which centers all highlights | |
| var startTop = block.scrollTop; | |
| var targetTop = highlightBounds.top + ( Math.min( highlightBounds.bottom - highlightBounds.top, viewportHeight ) - viewportHeight ) / 2; | |
| // Account for offsets in position applied to the | |
| // <table> that holds our lines of code | |
| var lineTable = block.querySelector( '.hljs-ln' ); | |
| if( lineTable ) targetTop += lineTable.offsetTop - parseInt( blockStyles.paddingTop ); | |
| // Make sure the scroll target is within bounds | |
| targetTop = Math.max( Math.min( targetTop, block.scrollHeight - viewportHeight ), 0 ); | |
| if( skipAnimation === true || startTop === targetTop ) { | |
| block.scrollTop = targetTop; | |
| } | |
| else { | |
| // Don't attempt to scroll if there is no overflow | |
| if( block.scrollHeight <= viewportHeight ) return; | |
| var time = 0; | |
| var animate = function() { | |
| time = Math.min( time + 0.02, 1 ); | |
| // Update our eased scroll position | |
| block.scrollTop = startTop + ( targetTop - startTop ) * Plugin.easeInOutQuart( time ); | |
| // Keep animating unless we've reached the end | |
| if( time < 1 ) { | |
| scrollState.animationFrameID = requestAnimationFrame( animate ); | |
| } | |
| }; | |
| animate(); | |
| } | |
| }, | |
| /** | |
| * The easing function used when scrolling. | |
| */ | |
| easeInOutQuart: function( t ) { | |
| // easeInOutQuart | |
| return t<.5 ? 8*t*t*t*t : 1-8*(--t)*t*t*t; | |
| }, | |
| getHighlightedLineBounds: function( block ) { | |
| var highlightedLines = block.querySelectorAll( '.highlight-line' ); | |
| if( highlightedLines.length === 0 ) { | |
| return { top: 0, bottom: 0 }; | |
| } | |
| else { | |
| var firstHighlight = highlightedLines[0]; | |
| var lastHighlight = highlightedLines[ highlightedLines.length -1 ]; | |
| return { | |
| top: firstHighlight.offsetTop, | |
| bottom: lastHighlight.offsetTop + lastHighlight.offsetHeight | |
| } | |
| } | |
| }, | |
| /** | |
| * Visually emphasize specific lines within a code block. | |
| * This only 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 ) { | |
| var highlightSteps = Plugin.deserializeHighlightSteps( linesToHighlight || block.getAttribute( 'data-line-numbers' ) ); | |
| if( highlightSteps.length ) { | |
| highlightSteps[0].forEach( function( highlight ) { | |
| var elementsToHighlight = []; | |
| // Highlight a range | |
| if( typeof highlight.end === 'number' ) { | |
| elementsToHighlight = [].slice.call( block.querySelectorAll( 'table tr:nth-child(n+'+highlight.start+'):nth-child(-n+'+highlight.end+')' ) ); | |
| } | |
| // Highlight a single line | |
| else if( typeof highlight.start === 'number' ) { | |
| elementsToHighlight = [].slice.call( block.querySelectorAll( 'table tr:nth-child('+highlight.start+')' ) ); | |
| } | |
| if( elementsToHighlight.length ) { | |
| elementsToHighlight.forEach( function( lineElement ) { | |
| lineElement.classList.add( 'highlight-line' ); | |
| } ); | |
| block.classList.add( 'has-highlights' ); | |
| } | |
| } ); | |
| } | |
| }, | |
| /** | |
| * Parses and formats a user-defined string of line | |
| * numbers to highlight. | |
| * | |
| * @example | |
| * Plugin.deserializeHighlightSteps( '1,2|3,5-10' ) | |
| * // [ | |
| * // [ { start: 1 }, { start: 2 } ], | |
| * // [ { start: 3 }, { start: 5, end: 10 } ] | |
| * // ] | |
| */ | |
| deserializeHighlightSteps: function( highlightSteps ) { | |
| // Remove whitespace | |
| highlightSteps = highlightSteps.replace( /\s/g, '' ); | |
| // Divide up our line number groups | |
| highlightSteps = highlightSteps.split( Plugin.HIGHLIGHT_STEP_DELIMITER ); | |
| return highlightSteps.map( function( highlights ) { | |
| return highlights.split( Plugin.HIGHLIGHT_LINE_DELIMITER ).map( function( highlight ) { | |
| // Parse valid line numbers | |
| if( /^[\d-]+$/.test( highlight ) ) { | |
| highlight = highlight.split( Plugin.HIGHLIGHT_LINE_RANGE_DELIMITER ); | |
| var lineStart = parseInt( highlight[0], 10 ), | |
| lineEnd = parseInt( highlight[1], 10 ); | |
| if( isNaN( lineEnd ) ) { | |
| return { | |
| start: lineStart | |
| }; | |
| } | |
| else { | |
| return { | |
| start: lineStart, | |
| end: lineEnd | |
| }; | |
| } | |
| } | |
| // If no line numbers are provided, no code will be highlighted | |
| else { | |
| return {}; | |
| } | |
| } ); | |
| } ); | |
| }, | |
| /** | |
| * Serializes parsed line number data into a string so | |
| * that we can store it in the DOM. | |
| */ | |
| serializeHighlightSteps: function( highlightSteps ) { | |
| return highlightSteps.map( function( highlights ) { | |
| return highlights.map( function( highlight ) { | |
| // Line range | |
| if( typeof highlight.end === 'number' ) { | |
| return highlight.start + Plugin.HIGHLIGHT_LINE_RANGE_DELIMITER + highlight.end; | |
| } | |
| // Single line | |
| else if( typeof highlight.start === 'number' ) { | |
| return highlight.start; | |
| } | |
| // All lines | |
| else { | |
| return ''; | |
| } | |
| } ).join( Plugin.HIGHLIGHT_LINE_DELIMITER ); | |
| } ).join( Plugin.HIGHLIGHT_STEP_DELIMITER ); | |
| } | |
| } | |
| // 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); | |
| } | |
| export default () => Plugin; | |