As far as I can tell from the original post, Deepayan asked for a way
to find a package's namespace environment (rather than the package
environment, <namespace:foo> not <package:foo>), so the subject line is
subject to misinterpretation.
On Mon, 23 Oct 2006, Prof Brian Ripley wrote:
> On Sun, 22 Oct 2006, Seth Falcon wrote:
>
>> Seth Falcon <[EMAIL PROTECTED]> writes:
>>> Perhaps:
>>>
>>> R_FindNamespace(mkString(where))
>>
>> Sorry, this won't help you for package-level code as this function is
>> part of the internal use only API. It would be nice to have access to
>> it or a similar function from C in package code.
>
> Hmm, it is declared in Rinternals.h, which is the public header for
> manipulating R objects at C level. As such it is available to packages, but
> as it is not documented in 'Writing R Extensions' it is subject to change.
>
> R_FindNamespace is essentially the same code as Duncan M provided, so it is a
> pretty simple function. (It still contains a test that namespaces are
> supported, and that seems long overdue for removal.)
I think Deepayan's original enquiry was about getting hold of a namespace
environment from within an already loaded namespace. That can be done
entirely at C level, as we don't have the complication of possibly loading
the namespace. Just
val = findVarInFrame(R_NamespaceRegistry, install("pkgname"));
does that job, with val == R_UnboundValue should the namespace not be
loaded. AFAICS, everything here is available to a package writer, and
this is equally undocumented.
--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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