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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; indent-tabs-mode: nil; -*-
//
// Symbol.h: Rcpp R/C++ interface class library -- access R environments
//
// Copyright (C) 2013 - 2015 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_Symbol_h
#define Rcpp_Symbol_h
namespace Rcpp{
RCPP_API_CLASS(Symbol_Impl) {
public:
RCPP_GENERATE_CTOR_ASSIGN(Symbol_Impl)
/**
* wraps the SEXP into a Symbol object.
*
* @param x Accepted SEXP types are SYMSXP, CHARSXP and STRSXP
* in the last case, the first element of the character vector
* is silently used
*/
Symbol_Impl(SEXP x){
int type = TYPEOF(x) ;
switch( type ){
case SYMSXP:
Storage::set__( x ) ;
break; /* nothing to do */
case CHARSXP: {
#if R_VERSION >= R_Version(3,2,0)
SEXP charSym = Rf_installChar(x); // R 3.2.0 or later have Rf_installChar
#else
SEXP charSym = Rf_install(CHAR(x)); // cannot be gc()'ed once in symbol table
#endif
Storage::set__( charSym ) ;
break ;
}
case STRSXP: {
/* FIXME: check that there is at least one element */
#if R_VERSION >= R_Version(3,2,0)
SEXP charSym = Rf_installChar(STRING_ELT(x, 0 )); // R 3.2.0 or later have Rf_installChar
#else
SEXP charSym = Rf_install( CHAR(STRING_ELT(x, 0 )) ); // cannot be gc()'ed once in symbol table
#endif
Storage::set__( charSym );
break ;
}
default:
const char* fmt = "Cannot convert object to a symbol: "
"[type=%s; target=SYMSXP].";
throw not_compatible(fmt, Rf_type2char(TYPEOF(x)));
}
}
Symbol_Impl(const std::string& symbol){
Storage::set__( Rf_install(symbol.c_str()) );
}
inline const char* c_str() const {
return CHAR(PRINTNAME(Storage::get__())) ;
}
inline bool operator==(const char* other) const {
return ! strcmp(other, c_str() );
}
void update(SEXP){}
};
typedef Symbol_Impl<NoProtectStorage> Symbol;
} // namespace Rcpp
#endif
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