static int getPercentSCount(PsiExpression expression) {
    expression = PsiUtil.skipParenthesizedExprDown(expression);
    if (!(expression instanceof PsiLiteralExpression || expression instanceof PsiPolyadicExpression)
          || !ExpressionUtils.hasStringType(expression)) {
      return -1;
    }
    final Object value = ExpressionUtils.computeConstantExpression(expression);
    if (!(value instanceof String string)) {
      return -1;
    }
    int index = string.indexOf('%');
    final int length = string.length();
    int count = 0;
    while (index >= 0 && length > index + 1) {
      final char c = string.charAt(index + 1);
      if (c == 's') {
        count++;
      }
      else if (c != '%') {
        return -1;
      }
      index = string.indexOf('%', index + 1);
    }
    if (count == 0) {
      return -1;
    }
    return count;
  }
static int getPercentSCount(PsiExpression expression)