[antlr-interest] Can TokenRewriteStream be applied to rules?

[YINGAnnie]

Well, I tried it ,but this time the error is : java.lang.NullPointerException.

 

Did I do something wrong?

 

Thanks,

 

 

Annie

 


 


 
> Date: Wed, 25 Mar 2009 08:22:04 +0530
> From: indhu.b at s7software.com
> To: yimm8369 at hotmail.com
> CC: antlr-interest at antlr.org
> Subject: Re: [antlr-interest] Can TokenRewriteStream be applied to rules?
> 
> This will work:
> 
> variableStatement
> : VAR? variableDeclaration ( COMMA m=variableDeclaration )* semic
> {tokens.replace($m.start, $m.end, "something else");} &n bsp;
> ;
> 
> $m will be of type variableDeclaration_return which will be subclass of
> 'ParserRuleReturnScope'. $m is not Token.
> 
> 
> - Indhu
> 
> 
> YINGAnnie wrote:
> > Hi again,
> >
> > TokenRewriteStream can only replace the declared token, not the rule.
> > right?
> >
> > for example,If I want to replace VAR, it works fine, But if I want to
> > replace variableDeclaration , the error said $a can not be resolved.
> >
> > variableStatement
> > : m= VAR? variableDeclaration ( COMMA variableDeclaration )* semic
> > {tokens.replace($m, "something else");}
> > ;
> >
> >
> > variableStatement
> > : VAR? variableDeclaration ( COMMA m=variableDeclaration )* semic
> > {tokens.replace($m, "something else");} &n bsp;
> > ;
> >
> > So how can I replace variableDeclaration ?
> >
> > Thanks in advance.
> >
> > Annie
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