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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; indent-tabs-mode: nil; -*-
//
// DataFrame.h: Rcpp R/C++ interface class library -- data frames
//
// 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__DataFrame_h
#define Rcpp__DataFrame_h
namespace Rcpp{
namespace internal{
inline SEXP empty_data_frame(){
Shield<SEXP> df( Rf_allocVector(VECSXP, 0) );
Rf_setAttrib(df, R_NamesSymbol, Rf_allocVector(STRSXP, 0));
Rf_setAttrib(df, R_RowNamesSymbol, Rf_allocVector(INTSXP, 0));
Rf_setAttrib(df, R_ClassSymbol, Rf_mkString("data.frame"));
return df;
}
}
template <template <class> class StoragePolicy>
class DataFrame_Impl : public Vector<VECSXP, StoragePolicy> {
public:
typedef Vector<VECSXP, StoragePolicy> Parent ;
DataFrame_Impl() : Parent( internal::empty_data_frame() ){}
DataFrame_Impl(SEXP x) : Parent(x) {
set__(x);
}
DataFrame_Impl( const DataFrame_Impl& other) : Parent() {
set__(other) ;
}
template <typename T>
DataFrame_Impl( const T& obj ) ;
DataFrame_Impl& operator=( DataFrame_Impl& other){
if (*this != other) set__(other);
return *this;
}
DataFrame_Impl& operator=( SEXP x){
set__(x) ;
return *this ;
}
// By definition, the number of rows in a data.frame is contained
// in its row.names attribute. If it has row names of the form 1:n,
// they will be stored as {NA_INTEGER, -<nrow>}. Unfortunately,
// getAttrib(df, R_RowNamesSymbol) will force an expansion of that
// compact form thereby allocating a huge vector when we just want
// the row.names. Hence this workaround.
inline int nrow() const {
SEXP rn = R_NilValue ;
SEXP att = ATTRIB( Parent::get__() ) ;
while( att != R_NilValue ){
if( TAG(att) == R_RowNamesSymbol ) {
rn = CAR(att) ;
break ;
}
att = CDR(att) ;
}
if (Rf_isNull(rn))
return 0;
if (TYPEOF(rn) == INTSXP && LENGTH(rn) == 2 && INTEGER(rn)[0] == NA_INTEGER)
return std::abs(INTEGER(rn)[1]);
return LENGTH(rn);
}
template <typename T>
void push_back( const T& object){
Parent::push_back(object);
set_type_after_push();
}
template <typename T>
void push_back( const T& object, const std::string& name ){
Parent::push_back(object, name);
set_type_after_push();
}
template <typename T>
void push_front( const T& object){
Parent::push_front(object);
set_type_after_push();
}
template <typename T>
void push_front( const T& object, const std::string& name){
Parent::push_front(object, name);
set_type_after_push();
}
// Offer multiple variants to accomodate both old interface here and signatures in other classes
inline int nrows() const { return DataFrame_Impl::nrow(); }
inline int rows() const { return DataFrame_Impl::nrow(); }
inline R_xlen_t ncol() const { return DataFrame_Impl::length(); }
inline R_xlen_t cols() const { return DataFrame_Impl::length(); }
static DataFrame_Impl create(){
return DataFrame_Impl() ;
}
template <typename... T>
static DataFrame_Impl create(const T&... args) {
return DataFrame_Impl::from_list(Parent::create(args...));
}
private:
void set__(SEXP x){
if( ::Rf_inherits( x, "data.frame" )){
Parent::set__( x ) ;
} else{
Shield<SEXP> y(internal::convert_using_rfunction( x, "as.data.frame" )) ;
Parent::set__( y ) ;
}
}
void set_type_after_push(){
R_xlen_t max_rows = 0;
bool invalid_column_size = false;
List::iterator it;
// Get the maximum number of rows
for (it = Parent::begin(); it != Parent::end(); ++it) {
if (Rf_xlength(*it) > max_rows) {
max_rows = Rf_xlength(*it);
}
}
if (max_rows > 0) {
for (it = Parent::begin(); it != Parent::end(); ++it) {
if (Rf_xlength(*it) == 0 || ( Rf_xlength(*it) > 1 && max_rows % Rf_xlength(*it) != 0 )) {
// We have a column that is not an integer fraction of the largest
invalid_column_size = true;
}
}
}
if (invalid_column_size) {
warning("Column sizes are not equal in DataFrame::push_back, object degrading to List\n");
} else {
set__(Parent::get__());
}
}
static DataFrame_Impl from_list( Parent obj ){
bool use_default_strings_as_factors = true ;
bool strings_as_factors = true ;
int strings_as_factors_index = -1 ;
R_xlen_t n = obj.size() ;
CharacterVector names = obj.attr( "names" ) ;
if( !names.isNULL() ){
for( int i=0; i<n; i++){
if( names[i] == "stringsAsFactors" ){
strings_as_factors_index = i ;
use_default_strings_as_factors = false ;
if( !as<bool>(obj[i]) ) strings_as_factors = false ;
break ;
}
}
}
if( use_default_strings_as_factors )
return DataFrame_Impl(obj) ;
SEXP as_df_symb = Rf_install("as.data.frame");
SEXP strings_as_factors_symb = Rf_install("stringsAsFactors");
obj.erase(strings_as_factors_index) ;
names.erase(strings_as_factors_index) ;
obj.attr( "names") = names ;
Shield<SEXP> call( Rf_lang3(as_df_symb, obj, Rf_ScalarLogical(strings_as_factors) ) ) ;
SET_TAG( CDDR(call), strings_as_factors_symb ) ;
Shield<SEXP> res(Rcpp_fast_eval(call, R_GlobalEnv));
DataFrame_Impl out( res ) ;
return out ;
}
} ;
typedef DataFrame_Impl<PreserveStorage> DataFrame ;
}
#endif
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