[antlr-interest] OutOfMemory: impossible to process java comments only?

[SainTiss]

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Hi again,

It seems the problem can be circumvented by appending "\n;" to any input I 
give to the parser. This makes sense, since in that case there always is at 
least one statement, being the empty statement...

So at least it seems the problem is effectively related to the parser not 
seeing any tokens (because whitespace and comments are probably just 
discarded by the lexer?). Is it possible that this leads to the apparent 
infinite loops I'm experiencing?

Thanks,

Hans

On Tuesday 13 April 2004 15:14, SainTiss wrote:
> Hi,
>
> I've got a serious problem here. I've got this rule in the Java grammar,
> which allows parsing of a number of java statements:
>
> statementSequenceOnly
>
> 	(
> 		statement
> 	)*
> 	EOF!
> ;
>
> This works fine, in general... However, when I feed the parser some input
> which just consists of a comment (so there are zero statements), I get an
> OutOfMemory error. I pinpointed the problem to the following statement in
> the generated code:
> if ((_tokenSet_0.member(LA(1)))) {
>
> More specifically, it seems there is an endless loop on LA(1).
>
> I tried creating a rule with just EOF!, but I got the same problem. This
> time, there seemed to be an endless loop on
> match(Token.EOF_TYPE);
>
> Am I doing something wrong here?
>
> Thanks,
>
> Hans

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Hans Schippers
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