Got it. What I missed is the '$' symbol while referencing
I wrote:
r : t=a b a
{
... t.start.getTokenIndex() ...
}
It must have been
r : t=a b a
{
... $t.start.getTokenIndex() ...
}
Thanks :-)
----- Original Message -----
From: Terence Parr <[email protected]>
To: Indhu Bharathi <[email protected]>
Cc: antlr-interest <[email protected]>
Sent: Saturday, February 28, 2009 11:44:21 AM GMT+0530 Asia/Calcutta
Subject: Re: [antlr-interest] Rewriting in non tree grammar
label the rule refs, dude :)
Ter
On Feb 27, 2009, at 8:42 PM, Indhu Bharathi wrote:
>> $a.start.getTokenIndex() is better than relying on index probably.
>
> Great! But how to do the same when I have a production like this:
>
> a : b c b
> ;
>
> Suppose I need to insert some text before the first 'b' as well as the
> second 'b', I cannot write
>
> {
> Input.insertBefore( $b.start.getTokenIndex(), "some text");
> Input.insertBefore( $b.start.getTokenIndex(), "some other text");
> }
>
> If 'b' is a lexer rule ('B'). then I can do
>
> a : t1=B c t2=B
> {
> Input.insertBefore( t1, "some text");
> Input.insertBefore( t2, "some other text");
> }
> ;
>
> I tried doing the same thing for parser rule 'b' but it doesn't
> work. Any
> idea how to get this working?
>
>
> - Indhu
>
>
> -----Original Message-----
> From: Terence Parr [mailto:[email protected]]
> Sent: Friday, February 27, 2009 9:53 PM
> To: [email protected]
> Cc: antlr-interest
> Subject: Re: [antlr-interest] Rewriting in non tree grammar
>
>
> On Feb 27, 2009, at 12:43 AM, Indhu Bharathi wrote:
>
>> Figured it out :-) Here is a sample grammar that does what is
>> required:
>>
>> grammar Test;
>>
>> @members {
>> TokenRewriteStream input = (TokenRewriteStream) getTokenStream();
>> }
>>
>> r
>> @init {
>> int pos;
>> }
>> : a { pos = input.index(); } b
>> {
>> input.insertBefore(pos, "inserted");
>> }
>> ;
>
> $a.start.getTokenIndex() is better than relying on index probably.
> Ter
>
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