[antlr-interest] Augmenting AST with additional info

[Jim Idle]

It is the index to the token stream, so you just get those tokens out of
the token stream and they then tell you what their start line and offset
are.

Jim

> -----Original Message-----
> From: Krishnan Subramanian [mailto:krishsub at microsoft.com]
> Sent: Thursday, August 02, 2012 2:29 AM
> To: Jim Idle; antlr-interest at antlr.org
> Subject: RE: [antlr-interest] Augmenting AST with additional info
>
> Hi Jim,
>
> The METHOD_DECL node gives me the TokenStartIndex and TokenStopIndex as
> integers (I'm using C#; I don't know if Java is different).
>
> How would one translate the int to the actual token efficiently (e.g.
> as a lookup?)  in order to get the token's line number and offset?
>
> Regards,
>
> -krish
>
> -----Original Message-----
> From: antlr-interest-bounces at antlr.org [mailto:antlr-interest-
> bounces at antlr.org] On Behalf Of Jim Idle
> Sent: Thursday, August 2, 2012 12:25 AM
> To: antlr-interest at antlr.org
> Subject: Re: [antlr-interest] Augmenting AST with additional info
>
> The METHOD_DECL node will give you the first and last token, then you
> can get the line number and offset of the last token.
>
> Jim
>
>
> > -----Original Message-----
> > From: antlr-interest-bounces at antlr.org [mailto:antlr-interest-
> > bounces at antlr.org] On Behalf Of Krishnan Subramanian
> > Sent: Wednesday, August 01, 2012 2:13 PM
> > To: antlr-interest at antlr.org
> > Subject: [antlr-interest] Augmenting AST with additional info
> >
> > Hi all,
> >
> > I have some information that needs to be augmented to an AST and I
> > cannot figure out how to go about it.
> >
> > It is maybe best to illustrate via an example:
> >
> > Assuming I have a grammar where a method & its method body are
> > declared and the AST as follows:
> >
> > method_declaration
> >                 :               return_type type_name OPEN_PARENS
> > formal_parameter_list? CLOSE_PARENS LEFT_BRACE method_body
> RIGHT_BRACE
> >                                 -> ^(METHOD_DECL return_type
> type_name
> > formal_parameter_list? method_body)
> >                 ;
> >
> > Problem description
> > ================
> > In my AST, for METHOD_DECL (a token), I need to add some information
> > that tells me the location where the method has ended . That is, the
> > line number and column of RIGHT_BRACE.
> >
> > Given that I eliminate RIGHT_BRACE from my AST, is there any
> mechanism
> > to augment METHOD_DECL with (say) the line number and column number
> > information for RIGHT_BRACE?
> >
> > Regards,
> >
> > -krish
> >
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