[antlr-interest] Handling HASEXCEPTION / HASFAILURE

[Andy Grove]

Jim,

Thanks. Could you point me in the direction of the documentation for  
setting up these error message routines. I could not find anything on  
the ANTLR web site about this (apart from Java specific information).

Thanks,

Andy.



On Jul 28, 2009, at 11:40 AM, Jim Idle wrote:

> The calling rule will make a call to the error message routines so  
> check your stack there. But really you should parse, build a tree  
> then do this in the tree walk and you won't have the issue.
>
> Jim
>
> On Jul 28, 2009, at 2:21 AM, Andy Grove <andy.grove at codefutures.com>  
> wrote:
>
>> Because the C version of ANTLR does not support @after actions, I  
>> have implemented the equivalent in my grammar by placing a block of  
>> code at the end of my rule. For example:
>>
>> whereClause
>> @init { sse.pushCall(sse.WHERECLAUSE); }
>> 	:
>> 	(
>> 	WHERE
>> 		c = searchCondition
>>      )
>>      { sse.popCall(); } <-- @after action
>> 	;
>>
>> I noticed that this @after action was not running for some of my  
>> input data, so I added debug logging to the generated parser code  
>> and found that one of the calls to the HASEXCEPTION macro is  
>> returning true and the parser is finishing at that point.
>>
>> How am I supposed to detect if an exception like this has occurred  
>> and how do I find out what is causing the exception?
>>
>> Thanks,
>>
>> Andy.
>>
>>
>>
>>

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