[antlr-interest] v3.1.2 breakage in Lexer with +=

[Johannes Luber]

Greg Smolyn schrieb:
> Hi, I just gave that a try and it doesn't come out right at all.
> 
> Try compiling it-- you'll see that it's missing the variable
> introduction for $h.Count
> 
> In mF_UNICODEDIGITS, it should be creating an IToken or ITree h, as well
> as IList list_h.  This was what ANTLR 3.1.1 did.  However, it does not,
> and so $h.Count cannot be compiled, because there is no variable to be
> put in the place for $h!
> 
> The list_h was there before and is the list that h is supposed to get
> added to.

Ah, I didn't notice that. I've managed to trace the cause down to a line
which ended up in the wrong template. I'll look into another release to
fix that problem.

Johannes
> 
> 
> On 10-Mar-09, at 2:36 PM, Johannes Luber wrote:
>>
>> grammar TestList;
>>
>> options{
>> language=CSharp2;
>> }
>>
>>
>> rule
>> : DIGIT
>> ;
>>
>> DIGIT
>> : F_UNICODEDIGITS
>> ;
>>
>> fragment F_HEXDIGIT
>>   : '0'..'9' | 'a'..'f' | 'A'..'F'
>>   ;
>>
>> fragment F_UNICODEDIGITS
>>   : (h+=F_HEXDIGIT)+ {$h.Count <= 6}?
>>   ;
>