[antlr-interest] ANTLR Optional statements

[mzukowski at bco.com]

What does it produce that's not right?

> -----Original Message-----
> From: jg z [mailto:zjg1964 at yahoo.com]
> Sent: Friday, April 05, 2002 6:44 AM
> To: antlr-interest at yahoogroups.com
> Subject: [antlr-interest] ANTLR Optional statements
> 
> 
> We are trying to convert a C++ Parser from PCCTS to
> ANTLR, and becoming increasingly frustrated by the
> differences between the two systems.
> 
> For instance;
> 
> In cplusplus.g we have,
> 
> class_head
>    :  (  STRUCT  
>       |  UNION 
>       |  CLASS 
>       )
>       {ID { base_clause } }
>    ;
> 
> which works fine in PCCTS.
> 
> For ANTLR we have converted this to,
> 
> class_head
>    :	
>     (  STRUCT  
>     |  UNION 
>     |  CLASS 
>     )
>     (ID ( base_clause)? )?
>    ;
> 
> However, the optional statements shown at the end of
> this production no longer produces a properly optional
> construction in the generated .cpp file.
> 
> What are we supposed to do?
> 
> David.
> 
> 
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