wishlist: additional argument in R_tryEval (Rinternals.h)
It's come up for me when I do FFI stuff. For GUI stuff I usually just want to suppress, but it's possible that you'd want to detect visibility if you were to make the GUI more programmable. I usually end up having to work around the whole business by fiddling with R_Visible. Speaking of R_tryEval, can someone with the appropriate powers PRETTY PLEASE just make it an official API? Having it continue to be unofficial is just getting silly.
On 4/6/07, Luke Tierney <luke at stat.uiowa.edu> wrote:
Even though it isn't officially part of the API it has seen some use so I'd prefer not to change the interface; instead add SEXP R_tryEvalWithVis(SEXP e, SEXP env, int *ErrorOccurred, int *visible); or something along those lines and define R_tryEval internally in terms of that. It may be worth thinking a bit more though to see if there is something else that might be useful at this point. I vaguely recall thinking recently about needing something else of this flavor but I can't seem to remember what it was exactly -- will try to see if I can recall. Best, luke On Fri, 6 Apr 2007, Deepayan Sarkar wrote:
Hi, R_tryEval, exported in Rinternals.h but not part of the API, is currently defined as: R_tryEval(SEXP e, SEXP env, int *ErrorOccurred); I'm trying to embed R in an application (basically yet another GUI), and this has been very helpful to catch errors. It would be even more helpful if it also gave access to the visibility flag. I can wrap this in a call to withVisible, and that works great, but if there is an error, traceback() contains a bunch of irrelevant levels. It seems fairly easy to add another argument, similar to ErrorOccurred, that is set to the visibility flag before returning. Is this something that could be considered for addition in R-devel? A possible patch for R/trunk is attached. Mac-GUI/REngine/REngine.m will also need a patch, but I don't understand the language it's written in. -Deepayan
--
Luke Tierney
Chair, Statistics and Actuarial Science
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa Phone: 319-335-3386
Department of Statistics and Fax: 319-335-3017
Actuarial Science
241 Schaeffer Hall email: luke at stat.uiowa.edu
Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu
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