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first version of multi-step code highlights

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This commit is contained in:
Hakim El Hattab
2019-04-05 07:59:28 +02:00
parent c636b88b2d
commit 7eb2cec6b6
5 changed files with 169 additions and 22 deletions
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10
css/reveal.css
View File

@ -1456,6 +1456,16 @@ body {
.reveal .hljs[data-line-numbers]:not([data-line-numbers=""]) tr:not(.highlight-line) {
opacity: 0.4; }
.reveal .hljs .highlight-line .hljs-ln-numbers {
font-weight: 600; }
.reveal .hljs:not(:first-child).fragment {
position: absolute;
top: 0;
left: 0;
width: 100%;
box-sizing: border-box; }
/*********************************************
* ROLLING LINKS
*********************************************/

12
css/reveal.scss
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@ -1594,6 +1594,18 @@ $controlsArrowAngleActive: 36deg;
opacity: 0.4;
}
.reveal .hljs .highlight-line .hljs-ln-numbers {
font-weight: 600;
}
.reveal .hljs:not(:first-child).fragment {
position: absolute;
top: 0;
left: 0;
width: 100%;
box-sizing: border-box;
}
/*********************************************
* ROLLING LINKS

4
demo.html
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@ -241,7 +241,7 @@
<section>
<h2>Pretty Code</h2>
<pre><code class="hljs" data-trim data-line-numbers="4,8-11">
<pre><code class="hljs" data-trim data-line-numbers="4|9|4,8-11">
import React, { useState } from 'react';
function Example() {
@ -412,7 +412,7 @@ Reveal.addEventListener( 'customevent', function() {
dependencies: [
{ src: 'plugin/markdown/marked.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
{ src: 'plugin/markdown/markdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
{ src: 'plugin/highlight/highlight.js', async: true },
{ src: 'plugin/highlight/highlight.js' },
{ src: 'plugin/search/search.js', async: true },
{ src: 'plugin/zoom-js/zoom.js', async: true },
{ src: 'plugin/notes/notes.js', async: true }

4
index.html
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@ -40,8 +40,8 @@
dependencies: [
{ src: 'plugin/markdown/marked.js' },
{ src: 'plugin/markdown/markdown.js' },
{ src: 'plugin/notes/notes.js', async: true },
{ src: 'plugin/highlight/highlight.js', async: true }
{ src: 'plugin/highlight/highlight.js' },
{ src: 'plugin/notes/notes.js', async: true }
]
});
</script>

161
plugin/highlight/highlight.js
View File

@ -68,6 +68,11 @@ c:[{cN:"comment",b:/\(\*/,e:/\*\)/},e.ASM,e.QSM,e.CNM,{b:/\{/,e:/\}/,i:/:/}]}});
}
var RevealHighlight = {
HIGHLIGHT_STEP_DELIMITER: '|',
HIGHLIGHT_LINE_DELIMITER: ',',
HIGHLIGHT_LINE_RANGE_DELIMITER: '-',
init: function() {
// Read the plugin config options and provide fallbacks
@ -103,6 +108,10 @@ c:[{cN:"comment",b:/\(\*/,e:/\*\)/},e.ASM,e.QSM,e.CNM,{b:/\{/,e:/\}/,i:/:/}]}});
* Highlights a code block. If the <code> node has the
* 'data-line-numbers' attribute we also generate slide
* numbers.
*
* If a code block contains multiple line highlight steps
* we duplicate the code block once per lines that should
* be highlighted.
*/
highlightBlock: function( block ) {
@ -113,7 +122,45 @@ c:[{cN:"comment",b:/\(\*/,e:/\*\)/},e.ASM,e.QSM,e.CNM,{b:/\{/,e:/\}/,i:/:/}]}});
// 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 );
setTimeout( function() {
var highlightSteps = RevealHighlight.deserializeHighlightSteps( block.getAttribute( 'data-line-numbers' ) );
// If there are at least two highlight steps, generate
// fragment clones for each
if( highlightSteps.length > 1 ) {
// If the original code block has a fragment-index,
// each clone should increment from that index
var fragmentIndex = parseInt( block.getAttribute( 'data-fragment-index' ), 10 );
if( typeof fragmentIndex !== 'number' || isNaN( fragmentIndex ) ) {
fragmentIndex = null;
}
// Generate fragments for all except the first step/original block
highlightSteps.slice(1).forEach( function( highlight ) {
var fragmentBlock = block.cloneNode( true );
fragmentBlock.setAttribute( 'data-line-numbers', RevealHighlight.serializeHighlightSteps( [ highlight ] ) );
fragmentBlock.classList.add( 'fragment' );
block.parentNode.appendChild( fragmentBlock );
RevealHighlight.highlightLines( fragmentBlock );
if( fragmentIndex ) {
fragmentBlock.setAttribute( 'data-fragment-index', fragmentIndex );
fragmentIndex += 1;
}
} );
block.setAttribute( 'data-line-numbers', RevealHighlight.serializeHighlightSteps( [ highlightSteps[0] ] ) );
}
RevealHighlight.highlightLines( block );
}.bind( this ), 0 );
}
},
@ -131,34 +178,112 @@ c:[{cN:"comment",b:/\(\*/,e:/\*\)/},e.ASM,e.QSM,e.CNM,{b:/\{/,e:/\}/,i:/:/}]}});
*/
highlightLines: function( block, linesToHighlight ) {
linesToHighlight = linesToHighlight || block.getAttribute( 'data-line-numbers' );
var highlightSteps = RevealHighlight.deserializeHighlightSteps( linesToHighlight || block.getAttribute( 'data-line-numbers' ) );
if( typeof linesToHighlight === 'string' && linesToHighlight !== '' ) {
if( highlightSteps.length ) {
linesToHighlight.split( ',' ).forEach( function( lineNumbers ) {
highlightSteps[0].forEach( function( highlight ) {
// Avoid failures becase of whitespace
lineNumbers = lineNumbers.replace( /\s/g, '' );
// Ensure that we looking at a valid slide number (1 or 1-2)
if( /^[\d-]+$/.test( lineNumbers ) ) {
lineNumbers = lineNumbers.split( '-' );
var lineStart = lineNumbers[0];
var lineEnd = lineNumbers[1] || lineStart;
[].slice.call( block.querySelectorAll( 'table tr:nth-child(n+'+lineStart+'):nth-child(-n+'+lineEnd+')' ) ).forEach( function( lineElement ) {
lineElement.classList.add( 'highlight-line' );
} );
var elementsToHighlight = [];
// Highlight a range
if( typeof highlight.end === 'number' ) {
elementsToHighlight = [].slice.call( block.querySelectorAll( 'table tr:nth-child(n+'+highlight.start+'):nth-child(-n+'+highlight.end+')' ) );
}
// Highlight a single line
else if( typeof highlight.start === 'number' ) {
elementsToHighlight = [].slice.call( block.querySelectorAll( 'table tr:nth-child('+highlight.start+')' ) );
}
elementsToHighlight.forEach( function( lineElement ) {
lineElement.classList.add( 'highlight-line' );
} );
} );
}
},
/**
* Parses and formats a user-defined string of line
* numbers to highlight.
*
* @example
* RevealHighlight.deserializeHighlightSteps( '1,2|3,5-10' )
* // [
* // [ { start: 1 }, { start: 2 } ],
* // [ { start: 3 }, { start: 5, end: 10 } ]
* // ]
*/
deserializeHighlightSteps: function( highlightSteps ) {
// Remove whitespace
highlightSteps = highlightSteps.replace( /\s/g, '' );
// Divide up our line number groups
highlightSteps = highlightSteps.split( RevealHighlight.HIGHLIGHT_STEP_DELIMITER );
return highlightSteps.map( function( highlights ) {
return highlights.split( RevealHighlight.HIGHLIGHT_LINE_DELIMITER ).map( function( highlight ) {
// Parse valid line numbers
if( /^[\d-]+$/.test( highlight ) ) {
highlight = highlight.split( RevealHighlight.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 ) {
if( typeof highlight.end === 'number' ) {
return highlight.start + RevealHighlight.HIGHLIGHT_LINE_RANGE_DELIMITER + highlight.end;
}
else if( typeof highlight.start === 'number' ) {
return highlight.start;
}
else {
return '';
}
} ).join( RevealHighlight.HIGHLIGHT_LINE_DELIMITER );
} ).join( RevealHighlight.HIGHLIGHT_STEP_DELIMITER );
}
}
Reveal.registerPlugin( 'highlight', RevealHighlight );