[antlr-interest] Target Language .stg Files - Token Names

[Mark Wright]

Maybe an AttributeRenderer might help:

http://www.antlr.org/wiki/display/ST/Object+rendering

Thanks, Mark

On Mon, 8 Jun 2009 17:36:46 -0400
Justin Holewinski <shawmishrak at gmail.com> wrote:

> I've been working on a C++ (STL + Boost) target for Antlr 3, and I'm
> struggling with some StringTemplate semantics.  Specifically, when
> generating code for matching tokens, the <token> template will
> sometimes refer to a textual token name (e.g. ID) and other times it
> will refer to a constant, the token identifier (e.g. 33).  Is there a
> way to determine, within a StringTemplate rule, which of these
> representations is used?
> 
> I would like to generate code like:
> 
> match(MyParser::TOKEN_ID);
> 
> for token names, and
> 
> match(33);
> 
> for token constants, so I would like to do something like:
> 
> <if(token.isNumber)>
>   match(<token>);
> <else>
>   match(MyParser::TOKEN_<token>);
> <endif>
> 
> but how to do this is eluding me.
> 
> 
> Currently, I am forced to use preprocessor magic to get by:
> 
> #undef ID
> #define ID  MyParser::TOKEN_ID
> ...
> 
> which I hate to do for multiple reasons.
> 
> 
> On a side note, is there any documentation of which attributes are
> avilable for variables in target language .stg files?  For instance,
> what attributes are available on a <rule>?  All of the information I
> find comes from deciphering the other .stg files.
> 
> 
> Thanks,
> 
> Justin Holewinski


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