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// Language.h: Rcpp R/C++ interface class library -- language objects (calls)
//
// Copyright (C) 2010 - 2025 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_Language_h
#define Rcpp_Language_h
namespace Rcpp{
/**
* C++ wrapper around calls (LANGSXP SEXP)
*
* This represents calls that can be evaluated
*/
RCPP_API_CLASS(Language_Impl),
public DottedPairProxyPolicy< Language_Impl<StoragePolicy> > ,
public DottedPairImpl< Language_Impl<StoragePolicy> >
{
public:
typedef typename DottedPairProxyPolicy<Language_Impl>::DottedPairProxy Proxy;
typedef typename DottedPairProxyPolicy<Language_Impl>::const_DottedPairProxy const_Proxy;
RCPP_GENERATE_CTOR_ASSIGN(Language_Impl)
Language_Impl(){}
/**
* Attempts to convert the SEXP to a call
*
* @throw not_compatible if the SEXP could not be converted
* to a call using as.call
*/
Language_Impl(SEXP x){
Storage::set__( r_cast<LANGSXP>(x) );
}
/**
* Creates a call using the given symbol as the function name
*
* @param symbol symbol name to call
*
* Language( "rnorm" ) makes a SEXP similar to this (expressed in R)
* > as.call( as.list( as.name( "rnorm") ) )
* > call( "rnorm" )
*/
explicit Language_Impl( const std::string& symbol ){
Storage::set__( Rf_lang1( Rf_install(symbol.c_str()) ) );
}
/**
* Creates a call using the given symbol as the function name
*
* @param symbol symbol name to call
*
* Language( Symbol("rnorm") ) makes a SEXP similar to this:
* > call( "rnorm" )
*/
explicit Language_Impl( const Symbol& symbol ){
Storage::set__( Rf_lang1( symbol ) );
}
/**
* Creates a call to the function
*
* @param function function to call
*/
explicit Language_Impl( const Function& function) {
Storage::set__( Rf_lang1( function ) );
}
/**
* Creates a call to the given symbol using variable number of
* arguments
*
* @param symbol symbol
* @param ...Args variable length argument list. The type of each
* argument must be wrappable, meaning there need to be
* a wrap function that takes this type as its parameter
*
* For example, Language( "rnorm", 10, 0.0 )
* will create the same call as
* > call( "rnorm", 10L, 0.0 )
*
* 10 is wrapped as an integer vector using wrap( const& int )
* 0.0 is wrapped as a numeric vector using wrap( const& double )
* ...
*/
template <typename... T>
Language_Impl(const std::string& symbol, const T&... t) {
Storage::set__(langlist(Rf_install(symbol.c_str()), t...) );
}
template <typename... T>
Language_Impl(const Function& function, const T&... t) {
Storage::set__(langlist(function, t...));
}
/**
* sets the symbol of the call
*/
void setSymbol( const std::string& symbol){
setSymbol( Symbol( symbol ) );
}
/**
* sets the symbol of the call
*/
void setSymbol( const Symbol& symbol ){
SEXP x = Storage::get__();
SETCAR( x, symbol );
SET_TAG(x, R_NilValue);
}
/**
* sets the function
*/
void setFunction( const Function& function){
SEXP x = Storage::get__();
SETCAR( x, function );
SET_TAG(x, R_NilValue); /* probably not necessary */
}
/**
* eval this call in the global environment
*/
SEXP eval() const {
return Rcpp_fast_eval( Storage::get__(), R_GlobalEnv );
}
/**
* eval this call in the requested environment
*/
SEXP eval(SEXP env) const {
return Rcpp_fast_eval( Storage::get__(), env );
}
SEXP fast_eval() const {
return internal::Rcpp_eval_impl( Storage::get__(), R_GlobalEnv);
}
SEXP fast_eval(SEXP env ) const {
return internal::Rcpp_eval_impl( Storage::get__(), env);
}
void update(SEXP x) {
if (TYPEOF(x) != LANGSXP) {
Storage::set__(r_cast<LANGSXP>(x));
}
SET_TAG( x, R_NilValue );
}
};
typedef Language_Impl<PreserveStorage> Language;
template <typename RESULT_TYPE=SEXP>
class fixed_call {
public:
typedef RESULT_TYPE result_type;
fixed_call( Language call_ ) : call(call_){}
fixed_call( Function fun ) : call(fun){}
RESULT_TYPE operator()(){
return as<RESULT_TYPE>( call.eval() );
}
private:
Language call;
};
template <typename T, typename RESULT_TYPE = SEXP>
class unary_call : public std::function<RESULT_TYPE(T)> {
public:
unary_call( Language call_ ) : call(call_), proxy(call_,1) {}
unary_call( Language call_, R_xlen_t index ) : call(call_), proxy(call_,index){}
unary_call( Function fun ) : call( fun, R_NilValue), proxy(call,1) {}
RESULT_TYPE operator()( const T& object ){
proxy = object;
return as<RESULT_TYPE>( call.eval() );
}
private:
Language call;
Language::Proxy proxy;
};
template <typename T1, typename T2, typename RESULT_TYPE = SEXP>
class binary_call : public std::function<RESULT_TYPE(T1,T2)> {
public:
binary_call( Language call_ ) : call(call_), proxy1(call_,1), proxy2(call_,2) {}
binary_call( Language call_, R_xlen_t index1, R_xlen_t index2 ) : call(call_), proxy1(call_,index1), proxy2(call_,index2){}
binary_call( Function fun) : call(fun, R_NilValue, R_NilValue), proxy1(call,1), proxy2(call,2){}
RESULT_TYPE operator()( const T1& o1, const T2& o2 ){
proxy1 = o1;
proxy2 = o2;
return as<RESULT_TYPE>( call.eval() );
}
private:
Language call;
Language::Proxy proxy1;
Language::Proxy proxy2;
};
} // namespace Rcpp
#endif
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