isValid static method

bool isValid(
  1. String cnpj, [
  2. dynamic stripBeforeValidation = true
])

Implementation

static bool isValid(String cnpj, [stripBeforeValidation = true]) {
  if (stripBeforeValidation) cnpj = strip(cnpj);
  if (cnpj.isEmpty) return false;
  if (cnpj.length != 14) return false;
  if (blackList.contains(cnpj)) return false;

  String numbers = cnpj.substring(0, 12);
  numbers += _verifierDigit(numbers).toString();
  numbers += _verifierDigit(numbers).toString();

  return numbers.substring(numbers.length - 2) ==
      cnpj.substring(cnpj.length - 2);
}