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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; indent-tabs-mode: nil; -*-
//
// rcast.h: Rcpp R/C++ interface class library -- cast from one SEXP type to another
//
// Copyright (C) 2010 - 2013 Dirk Eddelbuettel and Romain Francois
//
// This file is part of Rcpp.
//
// Rcpp is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 2 of the License, or
// (at your option) any later version.
//
// Rcpp is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Rcpp. If not, see <http://www.gnu.org/licenses/>.
#ifndef Rcpp_rcast_h
#define Rcpp_rcast_h
#include <Rcpp/exceptions.h>
namespace Rcpp{
namespace internal {
inline SEXP convert_using_rfunction(SEXP x, const char* const fun){
Armor<SEXP> res ;
try{
SEXP funSym = Rf_install(fun);
res = Rcpp_eval( Rf_lang2( funSym, x ) ) ;
} catch( eval_error& e){
throw not_compatible( std::string("could not convert using R function : ") + fun ) ;
}
return res;
}
// r_true_cast is only meant to be used when the target SEXP type
// is different from the SEXP type of x
template <int TARGET>
SEXP r_true_cast( SEXP x) {
throw not_compatible( "not compatible" ) ;
return x ; // makes solaris happy
}
template <int RTYPE>
SEXP basic_cast( SEXP x){
if( TYPEOF(x) == RTYPE ) return x ;
switch( TYPEOF(x) ){
case REALSXP:
case RAWSXP:
case LGLSXP:
case CPLXSXP:
case INTSXP:
return Rf_coerceVector( x, RTYPE) ;
default:
throw ::Rcpp::not_compatible( "not compatible with requested type" ) ;
}
return R_NilValue ; /* -Wall */
}
template<>
inline SEXP r_true_cast<INTSXP>(SEXP x){
return basic_cast<INTSXP>(x) ;
}
template<>
inline SEXP r_true_cast<REALSXP>(SEXP x){
return basic_cast<REALSXP>(x) ;
}
template<>
inline SEXP r_true_cast<RAWSXP>(SEXP x){
return basic_cast<RAWSXP>(x) ;
}
template<>
inline SEXP r_true_cast<CPLXSXP>(SEXP x){
return basic_cast<CPLXSXP>(x) ;
}
template<>
inline SEXP r_true_cast<LGLSXP>(SEXP x){
return basic_cast<LGLSXP>(x) ;
}
template <>
inline SEXP r_true_cast<STRSXP>(SEXP x){
switch( TYPEOF( x ) ){
case CPLXSXP:
case RAWSXP:
case LGLSXP:
case REALSXP:
case INTSXP:
{
// return Rf_coerceVector( x, STRSXP );
// coerceVector does not work for some reason
Shield<SEXP> call( Rf_lang2( Rf_install( "as.character" ), x ) ) ;
Shield<SEXP> res( Rf_eval( call, R_GlobalEnv ) ) ;
return res ;
}
case CHARSXP:
return Rf_ScalarString( x ) ;
case SYMSXP:
return Rf_ScalarString( PRINTNAME( x ) ) ;
default:
throw ::Rcpp::not_compatible( "not compatible with STRSXP" ) ;
}
return R_NilValue ; /* -Wall */
}
template<>
inline SEXP r_true_cast<VECSXP>(SEXP x) {
return convert_using_rfunction(x, "as.list" ) ;
}
template<>
inline SEXP r_true_cast<EXPRSXP>(SEXP x) {
return convert_using_rfunction(x, "as.expression" ) ;
}
template<>
inline SEXP r_true_cast<LISTSXP>(SEXP x) {
switch( TYPEOF(x) ){
case LANGSXP:
{
Shield<SEXP> y( Rf_duplicate( x ));
SET_TYPEOF(y,LISTSXP) ;
return y ;
}
default:
return convert_using_rfunction(x, "as.pairlist" ) ;
}
}
template<>
inline SEXP r_true_cast<LANGSXP>(SEXP x) {
return convert_using_rfunction(x, "as.call" ) ;
}
} // namespace internal
template <int TARGET> SEXP r_cast(SEXP x) {
if (TYPEOF(x) == TARGET) {
return x;
} else {
#ifdef RCPP_WARN_ON_COERCE
Shield<SEXP> result( internal::r_true_cast<TARGET>(x) );
Rf_warning("coerced object from '%s' to '%s'",
CHAR(Rf_type2str(TYPEOF(x))),
CHAR(Rf_type2str(TARGET))
);
return result;
#else
return internal::r_true_cast<TARGET>(x);
#endif
}
}
} // namespace Rcpp
#endif
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