private static boolean allOperandsAreLiterals(@Nullable final PsiExpression expression) {
    if (expression == null) return false;
    if (expression instanceof PsiLiteralExpression) return true;
    if (expression instanceof PsiPolyadicExpression) {
      Stack<PsiExpression> stack = new Stack<>();
      stack.add(expression);
      while (!stack.isEmpty()) {
        PsiExpression psiExpression = stack.pop();
        if (psiExpression instanceof PsiPolyadicExpression binaryExpression) {
          for (PsiExpression op : binaryExpression.getOperands()) {
            stack.push(op);
          }
        }
        else if (!(psiExpression instanceof PsiLiteralExpression)) {
          return false;
        }
      }
      return true;
    }
    return false;
  }
private static boolean allOperandsAreLiterals(@Nullable final PsiExpression expression)