[antlr-interest] Need help with rule-parameters (ANTLR bug?)

[Christian]

Then I think you must post a minimal grammar with your problem so that
we can examine your problem locally on our machines.

Am 17.01.2012 15:58, schrieb Sean Walton:
> No go. I took out "{ $tree }" and still get the same problem.
> The problem is at line #4 (not #7) in the grammar; I've tried all
> permutations of these parameters, but the problem persists. I believe
> that the process of creating synthetic predicate is causing the
> problem, because I can actually find with "n" is being defined elsewhere.
> When I manually patch (commenting out "void =null" and defining the
> type appropriately of "n"), it compiles and works (caveat: I still
> don't get the tree).
> Also, I struggle to believe that a botch job on my end would create
> "void =null;" when clearly Java does not allow void types.
>
> Sean Walton
> ab8kf at aim.com
>
>
> -----Original Message-----
> From: Christian <chwchw at gmx.de>
> To: antlr-interest <antlr-interest at antlr.org>
> Sent: Tue, Jan 17, 2012 1:15 am
> Subject: Re: [antlr-interest] Need help with rule-parameters (ANTLR bug?)
>
> Hi Sean,
>
> wrongly generated code often results from a wrong grammar---what ever
> the latter means. The error source is unfortunately not always clear.
> I would first try to change your action code in the last rewrite rule: {
> $tree }.
> I think you want to add this as second entry, but you add it as direct
> (Java/C# etc.) code. Remove the braces. However, I do not know whether
> you can insert an arbitrary object within a rewrite rule. Usually, you
> give the result of a parser rule (I do not know what general return
> value it has).
>
> Regards,
> Christian
>
> Am 16.01.2012 23:12, schrieb Sean Walton:
> >  When I put in this:
> >
> > 1 cccl_declaration[Object tree]
> > 2     : cccl_name cccl_def_options '\n'
> > 3         -> ^(CCCL_DECLARATION cccl_name cccl_def_options)
> > 4     | n=cccl_name cccl_def_options '\n' cccl_declaration[n.getTree()]
> > 5         -> ^(CCCL_DECLARATION cccl_name cccl_def_options)
> > 6     | cccl_name cccl_command_params* ':' '\n' cccl_execution_block
> > 7         -> ^(CCCL_IMPLEMENTATION { $tree } cccl_name cccl_command_params* 
> cccl_execution_block)
> > 8     ;
> >
> > I get this:
> >
> > 1    public final void synpred3_cccl_fragment() throws RecognitionException {
> > 2-->  void  =null;
> > 3
> > 4
> > 5        // /home/swalton/Projects/Arthur/Tools/Testing/CCCL/cccl.g:153:4: (n= 
> cccl_name cccl_def_options '\\n' cccl_declaration[n.getTree()] )
> > 6        // /home/swalton/Projects/Arthur/Tools/Testing/CCCL/cccl.g:153:4: n= 
> cccl_name cccl_def_options '\\n' cccl_declaration[n.getTree()]
> > 7        {
> > 8        pushFollow(FOLLOW_cccl_name_in_synpred3_cccl402);
> > 9-->    n=cccl_name();
> > 10
> > 11       state._fsp--;
> > 12       if (state.failed) return ;
> > 13
> > 14       pushFollow(FOLLOW_cccl_def_options_in_synpred3_cccl404);
> > 15       cccl_def_options();
> > 16
> > 17       state._fsp--;
> > 18       if (state.failed) return ;
> > 19
> > 20       match(input,113,FOLLOW_113_in_synpred3_cccl406); if (state.failed) 
> return ;
> > 21
> > 22       pushFollow(FOLLOW_cccl_declaration_in_synpred3_cccl408);
> > 23       cccl_declaration(n.getTree());
> > 24
> > 26       state._fsp--;
> > 27       if (state.failed) return ;
> > 28
> > 29       }
> >
> >     }
> >
> > Note the arrows. "void =null" is clearly wrong, and in "n=cccl_name()" the "n" 
> is not defined (it is defined outside this synthetic predicate).
> >
> > What I want to do:
> > I need to collect "cccl_name" from "cccl_declaration" and place them in the 
> CCCL_IMPLEMENTATION (line #7) rewrite.
> >
> >  
> >
> > Sean Walton
> > ab8kf at aim.com
> >
> >
> > List: http://www.antlr.org/mailman/listinfo/antlr-interest
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> >
>
>
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