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#ifndef SOURCETOOLS_R_R_UTILS_H
#define SOURCETOOLS_R_R_UTILS_H
#include <vector>
#include <sourcetools/core/core.h>
#include <sourcetools/r/RHeaders.h>
namespace sourcetools {
namespace r {
class Protect : noncopyable
{
public:
Protect(): n_(0) {}
~Protect() { UNPROTECT(n_); }
SEXP operator()(SEXP objectSEXP)
{
++n_;
return PROTECT(objectSEXP);
}
private:
int n_;
};
class RObjectFactory : noncopyable
{
public:
RObjectFactory()
: n_(0)
{
}
template <typename T, typename F>
SEXP create(SEXPTYPE type, const std::vector<T>& vector, F f)
{
++n_;
std::size_t n = vector.size();
SEXP resultSEXP = PROTECT(Rf_allocVector(type, n));
for (std::size_t i = 0; i < n; ++i)
f(resultSEXP, i, vector[i]);
return resultSEXP;
}
SEXP create(SEXPTYPE type, std::size_t n)
{
++n_;
return PROTECT(Rf_allocVector(type, n));
}
~RObjectFactory()
{
UNPROTECT(n_);
}
private:
std::size_t n_;
};
class ListBuilder : noncopyable
{
public:
void add(const std::string& name, SEXP value)
{
names_.push_back(name);
data_.push_back(protect_(value));
}
operator SEXP() const
{
std::size_t n = data_.size();
SEXP resultSEXP = protect_(Rf_allocVector(VECSXP, n));
SEXP namesSEXP = protect_(Rf_allocVector(STRSXP, n));
for (std::size_t i = 0; i < n; ++i)
{
SET_VECTOR_ELT(resultSEXP, i, data_[i]);
SET_STRING_ELT(namesSEXP, i, Rf_mkCharLen(names_[i].c_str(), names_[i].size()));
}
Rf_setAttrib(resultSEXP, R_NamesSymbol, namesSEXP);
return resultSEXP;
}
private:
std::vector<std::string> names_;
std::vector<SEXP> data_;
mutable Protect protect_;
};
} // namespace r
} // namespace sourcetools
#endif /* SOURCETOOLS_R_R_UTILS_H */
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