[antlr-interest] v3.1.2 breakage in Lexer with +=
Greg Smolyn
greg at smolyn.org
Tue Mar 10 14:42:26 PDT 2009
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 $h!
The list_h was there before and is the list that h is supposed to get
added to.
On 10-Mar-09, at 2:36 PM, Johannes Luber wrote:
>
> grammar TestList;
>
> options{
> language=CSharp2;
> }
>
>
> rule
> : DIGIT
> ;
>
> DIGIT
> : F_UNICODEDIGITS
> ;
>
> fragment F_HEXDIGIT
> : '0'..'9' | 'a'..'f' | 'A'..'F'
> ;
>
> fragment F_UNICODEDIGITS
> : (h+=F_HEXDIGIT)+ {$h.Count <= 6}?
> ;
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