[antlr-interest] Wondering about: Error handling

[Wincent Colaiuta]

El 18/6/2007, a las 2:14, Terence Parr escribió:

> On Jun 18, 2007, at 6:13 AM, Oliver Zeigermann wrote:
>> When I want special handling for certain exceptions only I can  
>> specify
>> that in the catch phrase. Like that:
>>
>> catch [FailedPredicateException fpe] {
>> ...
>> }
>>
>> However, this replaces the orignal catch block instead of being  
>> added.
>> I expected something like this to be generated:
>>
>>
>>     catch (FailedPredicateException fpe) {
>>       ...
>>        }
>>      catch (RecognitionException re) {
>>            reportError(re);
>>            recover(input,re);
>>        }
>>
>> But only the first block actually is generated.
>
> Interesting.  Hmm...I guess that was my intended behaviour but I  
> can see how it would be confusing.  OTOH, I can't always look at  
> the exception names inside and determine for an arbitrary target  
> what's up.  In fact, ANTLR's code generator can't assume anything.

At least as a straightforward workaround you can just include the  
RecognitionException catch block in your own override if that's the  
behaviour that you want...

Cheers,
Wincent