.
*/
namespace App\Services\LogSystem;
use Jfcherng\Diff\DiffHelper;
class LogDiffFormatter
{
/**
* Format the diff between the given data, depending on the type of the data.
* If the diff is not possible, an empty string is returned.
* @param $old_data
* @param $new_data
*/
public function formatDiff($old_data, $new_data): string
{
if (is_string($old_data) && is_string($new_data)) {
return $this->diffString($old_data, $new_data);
}
if (is_numeric($old_data) && is_numeric($new_data)) {
return $this->diffNumeric($old_data, $new_data);
}
return '';
}
private function diffString(string $old_data, string $new_data): string
{
return DiffHelper::calculate($old_data, $new_data, 'Combined',
[ //Diff options
'context' => 2,
],
[ //Render options
'detailLevel' => 'char',
'showHeader' => false,
]);
}
private function diffNumeric($old_data, $new_data): string
{
if ((!is_numeric($old_data)) || (!is_numeric($new_data))) {
throw new \InvalidArgumentException('The given data is not numeric.');
}
$difference = $new_data - $old_data;
//Positive difference
if ($difference > 0) {
return sprintf('+%s', $difference);
} elseif ($difference < 0) {
return sprintf('%s', $difference);
} else {
return sprintf('%s', $difference);
}
}
}