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

[YINGAnnie]

It is not null.

 

I use the following:

 

 

variableStatement
    :     VAR? m=variableDeclaration ( COMMA variableDeclaration )* semic    {System.out.print("Start"+$m.start+"stop"+$m.stop);tokens.replace($m.start, $m.stop, "something else");}  

 ;

 

And the input is:

 

var int:a=2;

 

Then I got the output:

 

Start[@68,219:221='int',<250>,8:12]     stop[@72,225:225='2',<248>,8:18]

 

That means variableDeclaration  match  int:a=2. However, the java.lang.NullPointerException   is still there.

 

 

Here is the error line in the parser file:

 

 if ( state.backtracking==0 ) {
              System.out.print("Start"+(m!=null?((Token)m.start):null)+"stop"+(m!=null?((Token)m.stop):null));tokens.replace((m!=null?((Token)m.start):null), (m!=null?((Token)m.stop):null), "something else");
            }

 

 

I really dont know why?

 

Thanks,

 

 

Annie
 


Date: Wed, 25 Mar 2009 08:53:17 +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?

Maybe 'm=variableDeclaration' didn't match anything in the input...


YINGAnnie wrote: 


 
 
Sorry ,I forgot to mention, I corrected $m.end.
 
Now, I am using {tokens.replace($m.start, $m.stop, "something else");}
 
but I got java.lang.NullPointerException  error.
 
It seems $m is null.
 
 
Annie
 

 


Date: Wed, 25 Mar 2009 08:40:46 +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?

There was a typo in my mail. It is $m.stop and not $m.end. Sorry :-)

And here is the documentation: http://www.antlr.org/api/Java/classorg_1_1antlr_1_1runtime_1_1_parser_rule_return_scope.html

:-)

YINGAnnie wrote: 


 
 
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_ret urn 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 $a can no t be resolved.
> >
> > variableStatement
> > : m= VAR? variableDeclaration ( COMMA variableDeclaration )* semic
> > {tokens.replace($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 a dvance.
> >
> > Annie
> > ------------------------------------------------------------------------
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> 



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