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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 - 2017 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) { // #nocov start
Armor<SEXP> res;
try{
SEXP funSym = Rf_install(fun);
Shield<SEXP> call(Rf_lang2(funSym, x));
res = Rcpp_fast_eval(call, R_GlobalEnv);
} catch( eval_error& e) {
const char* fmt = "Could not convert using R function: %s.";
throw not_compatible(fmt, fun);
}
return res; // #nocov end
}
// 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) {
const char* fmt = "Not compatible conversion to target: "
"[type=%s; target=%s].";
throw not_compatible(fmt,
Rf_type2char(TYPEOF(x)),
Rf_type2char(TARGET));
return x; // makes solaris happy
}
template <int RTYPE>
SEXP basic_cast( SEXP x) { // #nocov start
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:
const char* fmt = "Not compatible with requested type: "
"[type=%s; target=%s].";
#ifndef NDEBUG
REprintf(fmt,
Rf_type2char(TYPEOF(x)),
Rf_type2char(RTYPE));
abort();
#else
throw ::Rcpp::not_compatible(fmt,
Rf_type2char(TYPEOF(x)),
Rf_type2char(RTYPE));
#endif
} // #nocov end
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){ // #nocov
return basic_cast<REALSXP>(x); // #nocov
}
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){ // #nocov
return basic_cast<LGLSXP>(x); // #nocov
}
template <>
inline SEXP r_true_cast<STRSXP>(SEXP x){ // #nocov start
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( Rcpp_fast_eval( call, R_GlobalEnv ) );
return res;
}
case CHARSXP:
return Rf_ScalarString( x );
case SYMSXP:
return Rf_ScalarString( PRINTNAME( x ) );
default:
const char* fmt = "Not compatible with STRSXP: [type=%s].";
#ifndef NDEBUG
REprintf(fmt, Rf_type2char(TYPEOF(x)));
abort();
#else
throw ::Rcpp::not_compatible(fmt, Rf_type2char(TYPEOF(x)));
#endif
}
return R_NilValue; /* -Wall */
}
template<>
inline SEXP r_true_cast<VECSXP>(SEXP x) {
return convert_using_rfunction(x, "as.list"); // #nocov end
}
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) {
if (TYPEOF(x) == LANGSXP) {
return Rf_cons(CAR(x), CDR(x));
} else {
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) );
::Rcpp::warning("Coerced object from '%s' to '%s'.",
Rf_type2char(TYPEOF(x)),
Rf_type2char(TARGET)
);
return result;
#else
return internal::r_true_cast<TARGET>(x); // #nocov
#endif
}
}
} // namespace Rcpp
#endif
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