// Parses the domain section of an address. The domain may be in dot-atom format or surrounded by square
// brackets in domain-literal format.
// e.g. <*****@*****.**> or <user@[whatever I want]>
//
// Preconditions:
// - data[index] is just inside of the angle brackets (if any).
//
// Postconditions:
// - data[index] should refer to the '@' symbol
// - returns the parsed domain, including any square brackets for domain-literals
//
// Throws a FormatException:
// - For invalid un-escaped chars, including Unicode
// - If the start of the data string is reached
private static string ParseDomain(string data, ref int index)
{
// Skip comments and whitespace
index = ReadCfwsAndThrowIfIncomplete(data, index);
// Mark one end of the domain component
int startingIndex = index;
// Is the domain component in domain-literal format or dot-atom format?
if (data[index] == MailBnfHelper.EndSquareBracket)
{
index = DomainLiteralReader.ReadReverse(data, index);
}
else
{
index = DotAtomReader.ReadReverse(data, index);
}
string domain = data.Substring(index + 1, startingIndex - index);
// Skip comments and whitespace
index = ReadCfwsAndThrowIfIncomplete(data, index);
return(NormalizeOrThrow(domain));
}
// Parses the domain section of an address. The domain may be in dot-atom format or surrounded by square
// brackets in domain-literal format.
// e.g. <*****@*****.**> or <user@[whatever I want]>
//
// Preconditions:
// - data[index] is just inside of the angle brackets (if any).
//
// Postconditions:
// - data[index] should refer to the '@' symbol
// - returns the parsed domain, including any square brackets for domain-literals
//
// Throws a FormatException or returns false:
// - For invalid un-escaped chars, including Unicode
// - If the start of the data string is reached
private static bool TryParseDomain(string data, ref int index, [NotNullWhen(true)] out string?domain, bool throwExceptionIfFail)
{
// Skip comments and whitespace
if (!TryReadCfwsAndThrowIfIncomplete(data, index, out index, throwExceptionIfFail))
{
domain = default;
return(false);
}
// Mark one end of the domain component
int startingIndex = index;
// Is the domain component in domain-literal format or dot-atom format?
if (data[index] == MailBnfHelper.EndSquareBracket)
{
if (!DomainLiteralReader.TryReadReverse(data, index, out index, throwExceptionIfFail))
{
domain = default;
return(false);
}
}
else
{
if (!DotAtomReader.TryReadReverse(data, index, out index, throwExceptionIfFail))
{
domain = default;
return(false);
}
}
domain = data.Substring(index + 1, startingIndex - index);
// Skip comments and whitespace
if (!TryReadCfwsAndThrowIfIncomplete(data, index, out index, throwExceptionIfFail))
{
return(false);
}
if (!TryNormalizeOrThrow(domain, out domain, throwExceptionIfFail))
{
return(false);
}
return(true);
}
private static string ParseDomain(string data, ref int index)
{
index = ReadCfwsAndThrowIfIncomplete(data, index);
int num = index;
if (data[index] == MailBnfHelper.EndSquareBracket)
{
index = DomainLiteralReader.ReadReverse(data, index);
}
else
{
index = DotAtomReader.ReadReverse(data, index);
}
string str = data.Substring(index + 1, num - index);
index = ReadCfwsAndThrowIfIncomplete(data, index);
return(str);
}