[antlr-interest] How to get information on the tokens that produced a tree node?

[Jim Idle]

You get the token position I think, then you get the tokens, and ask for
the information from them.



Jim



*From:* Gonzague Reydet [mailto:gonzague.reydet at gmail.com]
*Sent:* Thursday, December 29, 2011 11:02 AM
*To:* Jim Idle
*Cc:* antlr-interest at antlr.org
*Subject:* Re: [antlr-interest] How to get information on the tokens that
produced a tree node?



Thank you for the reply Jim!

Actually I did not know what keyword to search for my question in
markmail...



I did not tried again since your reply but I remember from my initial
investigation that the tokens' information of the start & end base tree
only gave information of the node position on the AST, not the line and
character number in the input file.

Am I wrong?



Regards,

Gonzague

2011/12/29 Jim Idle <jimi at temporal-wave.com>

Did you check the archives? I am sure that I have answered this before.
But you get the start and end token from the node, then ask the start
token for its information and the end token for its information, and then
you have the complete span of a node. Beware of -> ^(NODE1 c u ^(NODE2 x))
as NODE2 won't get the span information when the rewrite is like that.

Jim


> -----Original Message-----
> From: antlr-interest-bounces at antlr.org [mailto:antlr-interest-
> bounces at antlr.org] On Behalf Of Gonzague Reydet
> Sent: Wednesday, December 28, 2011 2:47 PM
> To: antlr-interest at antlr.org
> Subject: Re: [antlr-interest] How to get information on the tokens that
> produced a tree node?
>
> Sory for the ping, but is their a way get information on the source
> input (line number for example) from the tree grammar & AST side?
>
> 2011/12/16 Gonzague Reydet <gonzague.reydet at gmail.com>
>
> > Hi all,
> >
> > I am working on a lexer & parser grammar that produce an AST from an
> > input file. The AST is then passed to a tree grammar that calls my
> > custom code. I think it is a classic ANTLR pattern, isn't it?
> > When an error is detected during the tree parsing, I am looking for a
> > way to print error with information on the original input tokens, not
> > on the tree node which is not relevant for the end user.
> > How to get information on the origin input file from the display
> error
> > function of the tree grammar? Is there a link between the tree node
> > stream of the AST and the token stream produced by the lexer?
> >
> > Note that my target language is C.
> >
> > Regards,
> > Gonzague.
> >
>

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