[Opencxx-users] Re: [opencxx] question about Environment::GetLineNumber

[Grzegorz J. <ja...@he...>]

On Thu, 13 Feb 2003, stan wrote:

> I am using OpenC++ ver 2.5.12
> I am calling Environment::GetLineNumber
> at various instances, with p being class declarations:
>
> int line;
> Ptree* file = e->GetLineNumber(p, line);
>
> and I always get:
>
> file = unknown
> line = 0
>
> why does this not work?

I think that might be a feature some time ago, but today it is a bug :-)

OpenC++ stores parse tree in a lisp-like tree data structure. Roughly
speaking this structure has nodes of two kinds --- leafs and non-leafs.
Only leafs are associated with pieces of source code. GetLineNumber() will
give you the result you expect only when called on leaf node. For
non-leaf, you have to descend through the leftmost path until you reach a
leaf. I think that this descending was not put into GetLineNumber() for
efficiency reasons.

Putting efficiency concerns aside (which are not so important today, as
they used to be when OpenC++ has been created), I do not see a reasonable
use for GetLineNumber() returning unknown/0, thus today I would call this
behaviour a bug.

If you manage to find a minute to fix it, please check out the latest
source code version from CVS. Let me know if I can be of any help.

Best regards
Grzegorz

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