[antlr-interest] optional rule confusion
Igor Fedorenko
ifedorenko at rogers.com
Wed Mar 3 05:28:23 PST 2004
I must be missing something really simple, but I cannot get antlr
generate reasonable parser for javadoc-like java method names (like
com.something.MyClass#method).
Here is what my parser rule looks like
protected javaname: ID (DOT ID)* (POUND ID)?
And here is what antlr generates for the last part
switch ( LA(1)) {
case POUND:
{
match(POUND);
m = LT(1);
match(ID);
break;
}
case EOF:
{
break;
}
default:
{
throw new NoViableAltException(LT(1), getFilename());
}
}
Why would antlr generate NoViableAltException for something which is
optional?
Regards,
Igor Fedorenko
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