[antlr-interest] Rule Arguments and Automatically Generated Syntactic Predicates

[Randall R Schulz]

Hello again,

Is there nothing to be said about this apparent problem? At least an 
explanation of why I should not have tried what I did?

RRS


On Tuesday 24 July 2007 08:07, Randall R Schulz wrote:
> Hi,
>
> I have a rule (the accept state for this particular tree grammar)
> with an argument:
>
> clifUnit [ String unitName ]
> returns [ CLPhrase cf ]
> @init {
>   fAcceptor.startUnit(unitName);
> }
>
>   : ( text[unitName]
>
>       {
>         $cf = $text.t;
>         fAcceptor.acceptText($text.t);
>       }
>
>     | ...
>
> This grammar is generated with backtrack and memoize both enabled.
> When I generate a Java tree parser from this grammar, this method is
> produced:
>
>   // $ANTLR start synpred1
>   public final void synpred1_fragment() throws RecognitionException {
>     // CLIFBuilder.g:647:6: ( text[unitName] )
>     // CLIFBuilder.g:647:6: text[unitName]
>     {
>       pushFollow(FOLLOW_text_in_synpred1108);
>       text(unitName);
>       _fsp--;
>       if (failed) return ;
>
>     }
>   }
>   // $ANTLR end synpred1
>
>
> The problem is, the unitName argument is not propagated to the formal
> or actual parameters of this method.
>
>
> Is this a bug or a known limitation?
>
>
> Randall Schulz