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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; tab-width: 8 -*-
//
// const_string_proxy.h: Rcpp R/C++ interface class library --
//
// Copyright (C) 2013 - 2018 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__vector__const_string_proxy_h
#define Rcpp__vector__const_string_proxy_h
namespace Rcpp{
namespace internal{
template<int RTYPE, template <class> class StoragePolicy>
class const_string_proxy {
public:
typedef typename ::Rcpp::Vector<RTYPE, StoragePolicy> VECTOR ;
typedef const char* iterator ;
typedef const char& reference ;
const_string_proxy() : parent(0), index(-1){};
/**
* Creates a proxy
*
* @param v reference to the associated character vector
* @param index index
*/
const_string_proxy( const VECTOR& v, R_xlen_t index_ ) : parent(&v), index(index_){}
const_string_proxy(SEXP x): parent(0), index(0) {
VECTOR tmp(x);
parent = &tmp;
}
const_string_proxy( const const_string_proxy& other ) :
parent(other.parent), index(other.index){} ;
void import( const const_string_proxy& other){
parent = other.parent ;
index = other.index ;
}
/**
* rhs use. Retrieves the current value of the
* element this proxy refers to.
*/
operator SEXP() const {
return get() ;
}
/**
* rhs use. Retrieves the current value of the
* element this proxy refers to and convert it to a
* C string
*/
operator /* const */ char*() const {
return const_cast<char*>( CHAR(get()) );
}
/**
* Prints the element this proxy refers to to an
* output stream
*/
template <int RT, template <class> class StoragePolicy_>
friend std::ostream& operator<<(std::ostream& os, const const_string_proxy<RT, StoragePolicy_>& proxy);
template <int RT, template <class> class StoragePolicy_>
friend std::string operator+( const std::string& x, const const_string_proxy<RT, StoragePolicy_>& proxy);
const VECTOR* parent;
R_xlen_t index ;
inline void move( R_xlen_t n ){ index += n ;}
inline SEXP get() const {
return STRING_ELT( *parent, index ) ;
}
inline iterator begin() const { return CHAR( STRING_ELT( *parent, index ) ) ; }
inline iterator end() const { return begin() + size() ; }
inline R_xlen_t size() const { return strlen( begin() ) ; }
inline bool empty() const { return *begin() == '\0' ; }
inline reference operator[]( R_xlen_t n ){ return *( begin() + n ) ; }
bool operator==( const char* other){
return strcmp( begin(), other ) == 0 ;
}
bool operator!=( const char* other){
return strcmp( begin(), other ) != 0 ;
}
bool operator==( const const_string_proxy& other){
return strcmp( begin(), other.begin() ) == 0 ;
}
bool operator!=( const const_string_proxy& other){
return strcmp( begin(), other.begin() ) != 0 ;
}
bool operator==( SEXP other ) const {
return get() == other;
}
bool operator!=( SEXP other ) const {
return get() != other;
}
private:
static std::string buffer ;
} ;
template <int RT>
bool operator<( const const_string_proxy<RT>& lhs, const const_string_proxy<RT>& rhs) {
return strcmp(
const_cast<char *>(lhs.begin() ),
const_cast<char *>(rhs.begin())
) < 0 ;
}
template <int RT>
bool operator>( const const_string_proxy<RT>& lhs, const const_string_proxy<RT>& rhs) {
return strcmp(
const_cast<char *>(lhs.begin() ),
const_cast<char *>(rhs.begin())
) > 0 ;
}
template <int RT>
bool operator>=( const const_string_proxy<RT>& lhs, const const_string_proxy<RT>& rhs) {
return strcmp(
const_cast<char *>(lhs.begin() ),
const_cast<char *>(rhs.begin())
) >= 0 ;
}
template <int RT>
bool operator<=( const const_string_proxy<RT>& lhs, const const_string_proxy<RT>& rhs) {
return strcmp(
const_cast<char *>(lhs.begin() ),
const_cast<char *>(rhs.begin())
) <= 0 ;
}
template<int RTYPE, template <class> class StoragePolicy> std::string const_string_proxy<RTYPE, StoragePolicy>::buffer ;
template <template <class> class StoragePolicy>
inline std::ostream& operator<<(std::ostream& os, const const_string_proxy<STRSXP, StoragePolicy>& proxy) {
os << static_cast<const char*>(proxy) ;
return os;
}
template <template <class> class StoragePolicy>
inline std::string operator+( const std::string& x, const const_string_proxy<STRSXP, StoragePolicy>& y ){
return x + static_cast<const char*>(y) ;
}
template <int RTYPE, template <class> class StoragePolicy1>
template <template <class> class StoragePolicy2>
string_proxy<RTYPE, StoragePolicy1>& string_proxy<RTYPE, StoragePolicy1>::operator=(const const_string_proxy<RTYPE, StoragePolicy2>& other){
set( other.get() ) ;
return *this ;
}
}
}
#endif
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