Normalization of Variable

Signed-off-by: Muhammad Yousuf Fazal <[email protected]>

src/Domain/ContentRenderer/CodeRenderer.php

@@ -58,7 +58,7 @@ private function getWrapperAttributes( string $contentUrl ): array {
 		$attributes['class'] = $this->getWrapperClasses();
 
 		if ( !empty( $this->showSpecificLines ) ) {
-			$attributes['data-show-lines'] = $this->showSpecificLines;
+			$attributes['data-show-lines'] = $this->lineNormalizer( $this->showSpecificLines );
 		}
 
 		$attributes['data-toolbar-order'] = 'copy-to-clipboard';
@@ -71,4 +71,21 @@ private function getWrapperAttributes( string $contentUrl ): array {
 		return $attributes;
 	}
 
+	/**
+	 * @return string
+	 */
+	private function lineNormalizer( string $lines ) {
+		$exploded = explode( ',', preg_replace( '/\s+/', '', $lines ) );
+
+		$ranges = array_filter( $exploded, function( $value ) {
+			if ( preg_match( '/^\d+$/', $value ) || preg_match( '/^(\d+)-(\d+)$/', $value ) ) {
+				return true;
+			}
+			else {
+				return false;
+			}
+		});
+
+		return implode( ',', $ranges );
+	}
 }