>$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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