private static function getCodeToInject()
{
$replacerMethodsClassSource = file_get_contents(__DIR__ . '/ReplacerMethods.src.php');
$methodsStartPosition = strpos($replacerMethodsClassSource, '{') + 1;
// after first curly bracket
$methodsEndPosition = strrpos($replacerMethodsClassSource, '}');
// before last curly bracket
$methodsSourceLength = $methodsEndPosition - $methodsStartPosition;
$methodsSource = substr($replacerMethodsClassSource, $methodsStartPosition, $methodsSourceLength);
return $methodsSource;
}