validate code line numbers to highlight
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		| @@ -115,10 +115,13 @@ var RevealHighlight = (function() { | |||||||
|  |  | ||||||
| 			linesToHighlight = linesToHighlight || block.getAttribute( 'data-line-numbers' ); | 			linesToHighlight = linesToHighlight || block.getAttribute( 'data-line-numbers' ); | ||||||
|  |  | ||||||
| 			if( typeof linesToHighlight === 'string' ) { | 			if( typeof linesToHighlight === 'string' && linesToHighlight !== '' ) { | ||||||
|  |  | ||||||
| 				linesToHighlight.split( ',' ).forEach( function( lineNumbers ) { | 				linesToHighlight.split( ',' ).forEach( function( lineNumbers ) { | ||||||
|  |  | ||||||
|  | 					// Ensure that we looking at a valid slide number (1 or 1-2) | ||||||
|  | 					if( /^[\d-]+$/.test( lineNumbers ) ) { | ||||||
|  |  | ||||||
| 						lineNumbers = lineNumbers.split( '-' ) | 						lineNumbers = lineNumbers.split( '-' ) | ||||||
|  |  | ||||||
| 						var lineStart = lineNumbers[0]; | 						var lineStart = lineNumbers[0]; | ||||||
| @@ -128,6 +131,8 @@ var RevealHighlight = (function() { | |||||||
| 							lineElement.classList.add( 'highlight-line' ); | 							lineElement.classList.add( 'highlight-line' ); | ||||||
| 						} ); | 						} ); | ||||||
|  |  | ||||||
|  | 					} | ||||||
|  |  | ||||||
| 				} ); | 				} ); | ||||||
|  |  | ||||||
| 			} | 			} | ||||||
|   | |||||||
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