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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; indent-tabs-mode: nil; -*-
//
// Formula.h: Rcpp R/C++ interface class library -- formula
//
// 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__Formula_h
#define Rcpp__Formula_h
#include <RcppCommon.h>
#include <Rcpp/Language.h>
namespace Rcpp{
RCPP_API_CLASS(Formula_Impl),
public DottedPairProxyPolicy<Formula_Impl<StoragePolicy> >,
public DottedPairImpl<Formula_Impl<StoragePolicy> >
{
public:
RCPP_GENERATE_CTOR_ASSIGN(Formula_Impl)
Formula_Impl(){} ;
Formula_Impl(SEXP x){
switch( TYPEOF( x ) ){
case LANGSXP:
if( ::Rf_inherits( x, "formula") ){
Storage::set__( x );
} else{
Storage::set__( internal::convert_using_rfunction( x, "as.formula") ) ;
}
break;
case EXPRSXP:
case VECSXP:
/* lists or expression, try the first one */
if( ::Rf_length(x) > 0 ){
SEXP y = VECTOR_ELT( x, 0 ) ;
if( ::Rf_inherits( y, "formula" ) ){
Storage::set__( y ) ;
} else{
SEXP z = internal::convert_using_rfunction( y, "as.formula") ;
Storage::set__( z ) ;
}
} else{
throw not_compatible( "cannot create formula from empty list or expression" ) ;
}
break;
default:
Storage::set__( internal::convert_using_rfunction( x, "as.formula") ) ;
}
}
explicit Formula_Impl( const std::string& code ) {
Storage::set__( internal::convert_using_rfunction( ::Rf_mkString(code.c_str()), "as.formula") ) ;
}
void update(SEXP){}
} ;
typedef Formula_Impl<PreserveStorage> Formula ;
} // namespace Rcpp
#endif
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