private void scanStandardizedTag() throws ParseException {
while (LDH.isSatisfiedBy(currentChar)) {
if (LET_DIG.isSatisfiedBy(currentChar)) {
takeIt();
} else if (currentChar == '-') {
takeIt();
while (currentChar == '-') takeIt();
take(LET_DIG);
} else {
throw currentCharToken.syntaxException("letter, digit or hyphen");
}
}
}
private AddressLiteralTagToken.Kind scanToken() throws ParseException {
// the first character can be a digit according to RFC 5321, but this
// would make difficult to decide if the source is a tag or the first
// digit of an IPv4 address literal. So assume that it starts with
// a letter. As of 2011-03 the only valid tag is IPv6, so this
// assumption is valid.
if (ALPHA.isSatisfiedBy(currentChar)) {
scanStandardizedTag();
return Kind.STANDARDIZED_TAG;
} else if (CharClasses.DIGIT.isSatisfiedBy(currentChar)) {
return Kind.DIGIT;
} else {
throw currentCharToken.syntaxException(
"The first digit of an " + "IPv4 address, or an address type tag, like 'IPv6'");
}
}
private void take(CharClass charClass) throws ParseException {
if (charClass.isSatisfiedBy(currentChar)) takeIt();
else throw currentCharToken.syntaxException(charClass);
}
