/// <summary>
/// Checks if a string value is a valid CNPJ representation
/// </summary>
/// <param name="value">a CNPJ string to be checked</param>
/// <param name="punctuation">the punctuation setting to
/// how validation must be handled</param>
/// <returns>true if CNPJ string is valid; false otherwise</returns>
internal static bool Validate(string value, CnpjPunctuation punctuation)
{
if (StringHelper.IsNullOrWhiteSpace(value))
{
return(false);
}
if (!Regex.IsMatch(value, CnpjHelper.regexValidations[punctuation]))
{
return(false);
}
value = CnpjHelper.Sanitize(value);
var inputDigit1 = int.Parse(
value.Substring(12, 1),
CultureInfo.InvariantCulture);
var inputDigit2 = int.Parse(
value.Substring(13, 1),
CultureInfo.InvariantCulture);
var calcDigit1 = CnpjHelper.CreateChecksum(value.Substring(0, 12), CnpjHelper.multiplier1);
var calcDigit2 = CnpjHelper.CreateChecksum(value.Substring(0, 13), CnpjHelper.multiplier2);
return(inputDigit1 == calcDigit1 && inputDigit2 == calcDigit2);
}
/// <summary>
/// Completes a partial CNPJ string by appending a valid checksum trailing
/// </summary>
/// <param name="value">a partial CNPJ string with or without punctuation</param>
/// <returns>a CNPJ string with a valid checksum trailing</returns>
internal static string Complete(string value)
{
if (StringHelper.IsNullOrWhiteSpace(value))
{
throw new ArgumentException("O CNPJ é inválido");
}
value = CnpjHelper.Sanitize(value);
if (!Regex.IsMatch(value, @"\d{9}"))
{
throw new ArgumentException("O CNPJ é inválido");
}
int digit1 = CnpjHelper.CreateChecksum(value, CnpjHelper.multiplier1);
int digit2 = CnpjHelper.CreateChecksum(
value + digit1.ToString(CultureInfo.InvariantCulture),
CnpjHelper.multiplier2);
return
(value +
digit1.ToString(CultureInfo.InvariantCulture) +
digit2.ToString(CultureInfo.InvariantCulture));
}
/// <summary>
/// Initializes a new instance of the <see cref="Cnpj"/> class.
/// </summary>
/// <param name="value">a valid CNPJ string</param>
/// <param name="punctuation">the punctuation setting to
/// how validation must be handled</param>
public Cnpj(string value, CnpjPunctuation punctuation)
{
if (StringHelper.IsNullOrWhiteSpace(value))
{
throw new ArgumentException("O CNPJ não pode ser nulo ou branco");
}
if (!CnpjHelper.Validate(value, punctuation))
{
throw new ArgumentException("O CNPJ não é válido");
}
this.parsedValue = CnpjHelper.Sanitize(value);
this.Punctuation = punctuation;
}