/// <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>
/// 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;
}
/// <summary>
/// Tries to create a new instance of <see cref="Cnpj"/> from a CNPJ string
/// </summary>
/// <param name="value">a CNPJ string</param>
/// <param name="cnpj">the new instance of <see cref="Cnpj"/></param>
/// <param name="punctuation">the punctuation setting to
/// how validation must be handled</param>
/// <returns>true if CNPJ string is valid; false, otherwise</returns>
public static bool TryParse(string value, out Cnpj cnpj, CnpjPunctuation punctuation)
{
var parsed = false;
try
{
cnpj = new Cnpj(value, punctuation);
parsed = true;
}
catch (ArgumentException)
{
cnpj = null;
parsed = false;
}
return(parsed);
}
/// <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)
{
var isValid = false;
if (value == null)
{
return(isValid);
}
if (punctuation == CnpjPunctuation.Strict)
{
isValid =
value.Length == 18 &&
value[2] == '.' &&
value[6] == '.' &&
value[10] == '/' &&
value[15] == '-';
}
else
{
isValid = value.Length == 14 || value.Length == 18;
}
var index1 = 0;
var index2 = 0;
var sum1 = 0;
var sum2 = 0;
for (var i = 0; isValid && i < value.Length; i++)
{
var symbol = value[i];
if (symbol == '-' || symbol == '.' || symbol == '/')
{
continue;
}
if (char.IsDigit(symbol))
{
if (index1 < 12)
{
sum1 += (symbol - 48) * ((index1 < 4 ? 5 : 13) - index1);
index1++;
}
if (index2 < 13)
{
sum2 += (symbol - 48) * ((index2 < 5 ? 6 : 14) - index2);
index2++;
}
isValid = true;
}
else
{
isValid = false;
}
}
if (isValid)
{
var lastDigit1 = value[value.Length - 2] - 48;
var lastDigit2 = value[value.Length - 1] - 48;
var checksum1 = sum1 % 11;
checksum1 = (checksum1 < 2) ? 0 : 11 - checksum1;
var checksum2 = sum2 % 11;
checksum2 = (checksum2 < 2) ? 0 : 11 - checksum2;
isValid =
checksum1 == lastDigit1 &&
checksum2 == lastDigit2;
}
return(isValid);
}
/// <summary>
/// Creates a new instance of <see cref="Cnpj"/> from a CNPJ string
/// </summary>
/// <param name="value">a CNPJ string</param>
/// <param name="punctuation">the punctuation setting to
/// how validation must be handled</param>
/// <returns>the new instance of <see cref="Cnpj"/></returns>
public static Cnpj Parse(string value, CnpjPunctuation punctuation)
{
return(new Cnpj(value, punctuation));
}
/// <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; otherwise, false</returns>
public static bool Validate(string value, CnpjPunctuation punctuation)
{
return(CnpjHelper.Validate(value, punctuation));
}
/// <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 (string.IsNullOrWhiteSpace(value))
{
return false;
}
if (!Regex.IsMatch(value, CnpjHelper.regexValidations[punctuation]))
{
return false;
}
value = CnpjHelper.Sanitize(value);
var inputDigit1 = Convert.ToInt32(value.Substring(12, 1));
var inputDigit2 = Convert.ToInt32(value.Substring(13, 1));
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;
}