R devel - Aug 2013 - Accessing the formals() of a non-exported method without :::?

Dear List,

I'm in the process of making tweaks to my various R packages following
changes in r-devel for package checks. I'm wondering about the one use
of ::: in one of my packages. I am arranging for a call to a
non-exported S3 method via do.call. For this I need the arguments of
the function and hence I was doing

    Args <- head(formals(analogue:::wa.default), -1)

Following the recent thread on legitimate uses of ::: I think the
above is both acceptable and won't generate a Note now with R CMD
check following a recent change to that code. But is there a better
way to get the formal arguments of a non-exported S3 method?

Thanks.

G

-- 
Gavin Simpson

On Aug 23, 2013, at 11:15, Gavin Simpson <ucfagls at gmail.com> wrote:
> Dear List,
> 
> I'm in the process of making tweaks to my various R packages following
> changes in r-devel for package checks. I'm wondering about the one use
> of ::: in one of my packages. I am arranging for a call to a
> non-exported S3 method via do.call. For this I need the arguments of
> the function and hence I was doing
> 
>    Args <- head(formals(analogue:::wa.default), -1)
> 
> Following the recent thread on legitimate uses of ::: I think the
> above is both acceptable and won't generate a Note now with R CMD
> check following a recent change to that code. But is there a better
> way to get the formal arguments of a non-exported S3 method?
> 
Something like (untested)

formalsS3 <- function(...) formals(getS3method(...))

might work. I haven't checked to see how R CMD check feels about
getS3method() though.

Michael

> Thanks.
> 
> G
> 
> -- 
> Gavin Simpson
> 
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