| import hljs from 'highlight.js' |
| |
| /* highlightjs-line-numbers.js 2.6.0 | (C) 2018 Yauheni Pakala | MIT License | github.com/wcoder/highlightjs-line-numbers.js */ |
| /* Edited by Hakim for reveal.js; removed async timeout */ |
| !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){e()}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;hljs?(hljs.initLineNumbersOnLoad=r,hljs.lineNumbersBlock=l,hljs.lineNumbersValue=o,t()):n.console.error("highlight.js not detected!")}(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: 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.className = '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 ); |
| |
| if( config.highlightOnLoad ) { |
| 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 at least 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; |