[antlr-interest] Re: bug in java.g?

[SainTiss]

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Hi,

On Wednesday 04 February 2004 01:48, lgcraymer wrote:
> --- In antlr-interest at yahoogroups.com, SainTiss <saintiss at a...> wrote:
> > I told it to match one statement indeed, but the problem is that it does
> > *not* seem to ignore everything else... With this input:
> > m = (TEST) n;
> > there is one statement, but the parser crashes.
> > With this input:
> > m = (TEST) n;
> > tessmklj
> > The parser successfully parses the first statement, and does not crash...
> > So that does look quite odd, no?
>
> If you are using the statement rule directly to match this, you expect this
> behavior--there is a lookahead set for statement which is checked and the
> "tessmklj" satisfies the lookahead.
>
> You really need a "statementComplete" rule such as Monty suggested _without
> the EOF_, but called by no rule within your grammar (EOF makes sense if you
> are sure to get an EOF as the next token, but not if you may have
> extraneous garbage).

Ah, it *does* seem to work now (forgot to ignore whitespace once more)... 
Thanks... Interesting enough, adding a statementComplete rule is the key, but 
it doesn't matter if you call statement() or statementComplete() afterwards 
so it seems!
Does that mean that the mere fact of there being a rule which calls statement 
and is itself never called suffices to not have the lookahead set?

>
> BTW, why are you doing single statement matches?  If you are doing
> interpretation of phrases, I have a string InputBuffer class which can be
> refilled.  That will be included with the 2.8 distribution--I need it to
> support testing--but that won't be until after 2.7.3 is officially
> released.  I can send you a copy if you would like.

In fact, what I want to do is parse some user code, which must be a number of 
statements, and transform the declaration statements into assignment 
statements. Should work fine with the TokenStreamRewriteEngine by Terence... 
So I think an InputBuffer which can be refilled is not of much use in this 
case... Unless I'm missing your point?

>
> --Loring
>
>
>
>
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- -- 
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