Re: [Rd] Rf_errorcall - translate to Pascal

From: Hans-Peter <gchappi_at_gmail.com>
Date: Thu 16 Feb 2006 - 16:37:56 GMT

Hello!

Thanks for your answers!

---
2006/2/16, Duncan Murdoch <murdoch@stats.uwo.ca>:

> I think it would be helpful to know the scope of the problem. Could you
> collect together a complete list of examples like this?
yes, I will do that. Until now it's only the one function mentioned and the 2 macro groups. Btw: your Delphi notes were great to get me started !!! --- 2006/2/16, Rainer M Krug <rkrug@sun.ac.za>:
> Hans-Peter wrote:
> > I (try to) convert the external R header files to Pascal (Delphi). At
> Sounds interesting - Could you keep me updated about your progress? I
> would be interested in the header files to use them in the analysis of
> simulations from Delphi.
Sure, but I cannot promise anything. I did the same for Matlab but it's much more difficult with R. --- 2006/2/16, Prof Brian Ripley <ripley@stats.ox.ac.uk>:
> Yes, and their names are case-sensitive too. So it is intentional that
> errorcall is not in R_Ext/Error.h. Since it is needed for writing
> front-ends and now mentioned in Writing R Extensions it should probably be
> in Rinternals.h.
that would be great!
>But note that is basically the only way that a non-core
> programmer is going to be writing code that gets passed 'call' objects.
ok, thanks
> > As a sidenote: in Defn.h are two macrogroups:
> This is intentional. Both Defn.h and Rinternals.h have these in a section
> protected by
> #ifdef USE_RINTERNALS
> #endif
> and that section should not be regarded as public.
I know that USE_RINTERNALS is ...internal and can change. But I had to translate it nevertheless, because I need at least the type definition "SEXP". And e.g. in chapter "4.8.2 Calling .External" there are code samples with the macros CADR, TYPEOF, CHAR, STRING_ELT, ... which AFAIK can run in Pascal only if they are redefined as pascal functions. Regarding the possible changes I have to think about DUnit tests to catch them.
>There _are_ (mis-titled) sections
> /* Promise Access Macros */
> /* Hashing Macros */
> in Rinternals.h, and those are the function equivalents defined for
> external use.
Sorry, I don't understand. Eg. in Rinternals.h the first entry in /* Promise Access Macros */ is: SEXP (PRCODE)(SEXP x); ~~~~~~~ Do you now mean, that the macro PRCODE is defined for external use? On the other hand, it's nowhere in the "writing R extensions documentation". But it's e.g. used in the library methods (in the function: methods-List_dispatch.c). If its meant for external use, then AFAIK the only way to use this macro in Pascal code is to translate it as a function, like e.g.: function rhPrcode( _x: pSexp ): pSexp; begin result:= _x.promsxp.expr; end; <license related> And now it's a bit unnice, that "_x.promsxp.expr" is defined in Defn.h [as: ((x)->u.promsxp.expr)] and not in Rinternal.h. With almost all other macros, e.g. FORMALS this is different, they are defined in Rinternal.h [e.g.: ((x)->u.closxp.formals)]. In this macro case I think its also for strict license interpretations irrelevant, because SEXPREC and promsxp_struct are fully declared in Rinternal.h. But it's not nice and maybe I just skip it. </license related> -- Regards, Hans-Peter ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
Received on Fri Feb 17 04:02:09 2006

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