Re: NYACC: getting source location info?

[<tomas@tuxteam.de>]

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On Fri, Jul 10, 2020 at 08:00:15PM -0700, Matt Wette wrote:

Hey, and thanks for your quick response!

> On 7/10/20 1:37 PM, tomas@tuxteam.de wrote:
> >Hi,
> >
> >I'm having some fun with NYACC (thanks, Matt!).
> >
> >To help debugging things and for errors and warnings, it'd be nice
> >to "know" where the current LHS non-terminal starts in the source.

[...]

> I assume you mean providing source location information to the
> values (i.e, $1, etc).

Yes, basically.

I was just looking from the other end of the rule (and pictured
having a "special symbol" like $loc giving the "start point" of
the curent LHS). Both would be equivalent, I think.

>                       I've thought about that a few times but have
> not arrived at anything intelligent.  Maybe using object properties
> (see sec 6.11 in Guile Ref) in the lexical analyzer, as you mention.

I didn't think of that -- it feels pretty "side-channel-y" at first,
but perhaps it's an elegant solution, after all.

Cheers
-- t

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