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validate code line numbers to highlight

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This commit is contained in:
Hakim El Hattab 2019-03-11 16:12:25 +01:00
parent 8690858b6f
commit da53b3a637
1 changed files with 12 additions and 7 deletions
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19
plugin/highlight/highlight.js
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@ -115,18 +115,23 @@ var RevealHighlight = (function() {
linesToHighlight = linesToHighlight || block.getAttribute( 'data-line-numbers' );
if( typeof linesToHighlight === 'string' ) {
if( typeof linesToHighlight === 'string' && linesToHighlight !== '' ) {
linesToHighlight.split( ',' ).forEach( function( lineNumbers ) {
lineNumbers = lineNumbers.split( '-' )
// Ensure that we looking at a valid slide number (1 or 1-2)
if( /^[\d-]+$/.test( lineNumbers ) ) {
var lineStart = lineNumbers[0];
var lineEnd = lineNumbers[1] || lineStart;
lineNumbers = lineNumbers.split( '-' )
[].slice.call( block.querySelectorAll( 'table tr:nth-child(n+'+lineStart+'):nth-child(-n+'+lineEnd+')' ) ).forEach( function( lineElement ) {
lineElement.classList.add( 'highlight-line' );
} );
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' );
} );
}
} );