rstudio/src/cpp/r/RSexp.cpp at master · andschar/rstudio · GitHub

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* RSexp.cpp

* Unless you have received this program directly from RStudio pursuant

* to the terms of a commercial license agreement with RStudio, then

* this program is licensed to you under the terms of version 3 of the

* GNU Affero General Public License. This program is distributed WITHOUT

* ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING THOSE OF NON-INFRINGEMENT,

* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Please refer to the

* AGPL (http://www.gnu.org/licenses/agpl-3.0.txt) for more details.

#define R_INTERNAL_FUNCTIONS

#define RSTUDIO_DEBUG_LABEL "rsexp"

// #define RSTUDIO_ENABLE_DEBUG_MACROS

#include <r/RSexp.hpp>

#include <r/RInternal.hpp>

#include <core/Algorithm.hpp>

#include <boost/bind.hpp>

#include <boost/function.hpp>

#include <boost/foreach.hpp>

#include <boost/numeric/conversion/cast.hpp>

#include <boost/optional.hpp>

#include <core/Macros.hpp>

#include <core/Log.hpp>

#include <core/DateTime.hpp>

#include <r/RExec.hpp>

#include <r/RErrorCategory.hpp>

// clean out global definitions of TRUE and FALSE so we can

// use the Rboolean variations of them

#undef TRUE

#undef FALSE

using namespace rstudio::core ;

namespace rstudio {

namespace r {

using namespace exec;

namespace sexp {

using namespace core::r_util;

namespace {

struct LexicalComparator

{

inline bool operator()(const char* lhs, const char* rhs) const

{

return strcmp(lhs, rhs) < 0;

}

};

// A simple wrapper set class that is primarily used as a means

// to re-use R's internal string cache, while providing lexical

// comparator for efficient lookup.

class StringSet : public std::set<const char*, LexicalComparator>

{

public:

bool contains(const char* value)

{

return this->find(value) != this->end();

}

};

struct FunctionSymbolUsage

{

StringSet symbolsUsed;

StringSet symbolsCheckedForMissingness;

};

// singleton: cache the result of 'examination' of functions

class FunctionSymbolUsageCache : boost::noncopyable

{

typedef std::pair<SEXP, SEXP> FunctionEnvironmentPair;

public:

bool contains(SEXP object)

{

return database_.count(pair(object));

}

FunctionSymbolUsage& get(SEXP object)

{

return database_[pair(object)];

}

void put(SEXP object, const FunctionSymbolUsage& usage)

{

database_[pair(object)] = usage;

}

private:

static FunctionEnvironmentPair pair(SEXP object)

{

return std::make_pair(object, CLOENV(object));

}

std::map<FunctionEnvironmentPair, FunctionSymbolUsage> database_;

};

FunctionSymbolUsageCache& functionSymbolUsageCache()

{

static FunctionSymbolUsageCache instance;

return instance;

}

} // anonymous namespace

std::string asString(SEXP object)

{

return std::string(Rf_translateChar(Rf_asChar(object)));

}

std::string safeAsString(SEXP object, const std::string& defValue)

{

if (object != R_NilValue)

return asString(object);

else

return defValue;

}

int asInteger(SEXP object)

{

return Rf_asInteger(object);

}

double asReal(SEXP object)

{

return Rf_asReal(object);

}

bool asLogical(SEXP object)

{

return Rf_asLogical(object) ? true : false;

}

bool fillVectorString(SEXP object, std::vector<std::string>* pVector)

{

if (TYPEOF(object) != STRSXP)

return false;

int n = Rf_length(object);

pVector->reserve(pVector->size() + n);

for (int i = 0; i < n; i++)

pVector->push_back(std::string(CHAR(STRING_ELT(object, i))));

return true;

}

bool fillSetString(SEXP object, std::set<std::string>* pSet)

{

if (TYPEOF(object) != STRSXP)

return false;

int n = Rf_length(object);

for (int i = 0; i < n; i++)

pSet->insert(std::string(CHAR(STRING_ELT(object, i))));

return true;

}

SEXP asEnvironment(std::string name)

{

if (name == "base")

return R_BaseEnv;

// prefix with 'package:' if no prefix specified yet

if (name.find(":") == std::string::npos)

name = "package:" + name;

SEXP envSEXP = ENCLOS(R_GlobalEnv);

while (envSEXP != R_EmptyEnv)

{

SEXP nameSEXP = Rf_getAttrib(envSEXP, R_NameSymbol);

if (TYPEOF(nameSEXP) == STRSXP &&

name == CHAR(STRING_ELT(nameSEXP, 0)))

{

return envSEXP;

}

envSEXP = ENCLOS(envSEXP);

}

LOG_ERROR_MESSAGE("No environment named '" + name + "' on search path");

return envSEXP;

}

namespace {

bool ensureNamespaceLoaded(const std::string& ns)

{

if (ns.empty()) return false;

SEXP nsSEXP = findNamespace(ns);

if (nsSEXP == R_UnboundValue)

{

r::exec::RFunction requireNamespace("base:::requireNamespace");

requireNamespace.addParam("package", ns);

requireNamespace.addParam("quietly", true);

Error error = requireNamespace.call();

if (error) return false;

}

return true;

}

} // anonymous namespace

std::vector<std::string> getLoadedNamespaces()

{

std::vector<std::string> result;

r::exec::RFunction loadedNamespaces("loadedNamespaces", "base");

Error error = loadedNamespaces.call(&result);

if (error)

LOG_ERROR(error);

return result;

}

SEXP asNamespace(const std::string& name)

{

if (!ensureNamespaceLoaded(name))

return R_EmptyEnv;

return findNamespace(name);

}

SEXP forcePromise(SEXP objectSEXP)

{

// if this isn't a promise, return it as-is

if (TYPEOF(objectSEXP) != PROMSXP)

return objectSEXP;

// if we already have a forced value, return that

SEXP valueSEXP = PRVALUE(objectSEXP);

if (valueSEXP != R_UnboundValue)

return valueSEXP;

// otherwise, evaluate the promise and return that result

r::sexp::Protect protect;

SEXP resultSEXP;

protect.add(resultSEXP = ::Rf_eval(PRCODE(objectSEXP), PRENV(objectSEXP)));

// update the promise reference

SET_PRVALUE(objectSEXP, resultSEXP);

// return the result

return resultSEXP;

}

SEXP findNamespace(const std::string& name)

{

if (name.empty())

return R_UnboundValue;

// case 4071: namespace look up executes R code that can trip the debugger

DisableDebugScope disableStepInto(R_GlobalEnv);

// R_FindNamespace will throw if it fails to find a particular name.

// Instead, we manually search the namespace registry.

SEXP nameSEXP = Rf_install(name.c_str());

SEXP ns = Rf_findVarInFrame(R_NamespaceRegistry, nameSEXP);

return ns;

}

void listEnvironment(SEXP env,

bool includeAll,

bool includeLastDotValue,

Protect* pProtect,

std::vector<Variable>* pVariables)

{

// reset passed vars

pVariables->clear();

// get the list of environment vars (protect locally because we

// we don't acutally return this list to the caller

SEXP envVarsSEXP;

Protect rProtect(envVarsSEXP = R_lsInternal(env, includeAll ? TRUE : FALSE));

// get variables

std::vector<std::string> vars;

Error error = r::sexp::extract(envVarsSEXP, &vars);

if (error)

{

LOG_ERROR(error);

return;

}

// add in .Last.value if it exists

if (!includeAll && includeLastDotValue)

{

SEXP lastValueSEXP = Rf_findVar(Rf_install(".Last.value"), env);

if (lastValueSEXP != R_UnboundValue)

vars.push_back(".Last.value");

}

// populate pVariables

BOOST_FOREACH(const std::string& var, vars)

{

SEXP varSEXP = R_NilValue;

// Merely calling Rf_findVar on an active binding will fire the binding.

// Don't try to get the SEXP for the variable in this case; leave the

// value as nil.

if (!isActiveBinding(var, env))

varSEXP = Rf_findVar(Rf_install(var.c_str()), env);

if (varSEXP != R_UnboundValue) // should never be unbound

{

pProtect->add(varSEXP);

pVariables->push_back(std::make_pair(var, varSEXP));

}

else

{

LOG_WARNING_MESSAGE(

"Unexpected R_UnboundValue returned from R_lsInternal");

}

namespace {

Error asPrimitiveEnvironment(SEXP envirSEXP,

SEXP* pTargetSEXP,

Protect* pProtect)

{

// fast-case: no need to call back into R

if (TYPEOF(envirSEXP) == ENVSXP)

{

pProtect->add(*pTargetSEXP = envirSEXP);

return Success();

}

// for non-S4 objects, we can just return an error (false) early

if (TYPEOF(envirSEXP) != S4SXP)

return Error(errc::UnexpectedDataTypeError, ERROR_LOCATION);

// use R function to convert

Error error = RFunction("base:::as.environment")

.addParam(envirSEXP)

.call(pTargetSEXP, pProtect);

if (error)

return error;

// ensure that we actually succeeded in producing a primitive environment

if (pTargetSEXP == NULL ||

*pTargetSEXP == NULL ||

!isPrimitiveEnvironment(*pTargetSEXP))

{

return Error(errc::UnexpectedDataTypeError, ERROR_LOCATION);

}

// we have a primitive environment; all is well

return Success();

}

bool hasActiveBindingImpl(const std::string& name,

SEXP envirSEXP,

std::set<SEXP>* pVisitedObjects)

{

Error error;

Protect protect;

// ensure we have an environment

if (!isEnvironment(envirSEXP))

return false;

// sanity check that we are working with a primitive environment

// (required to convert S4 objects that subclass 'environment' into

// a 'raw' R environment object)

error = asPrimitiveEnvironment(envirSEXP, &envirSEXP, &protect);

if (error)

return false;

// check for active binding

if (isActiveBinding(name, envirSEXP))

return true;

// resolve the object (discover in that frame)

SEXP nameSEXP = Rf_install(name.c_str());

SEXP varSEXP = Rf_findVarInFrame(envirSEXP, nameSEXP);

// check for special values

if (varSEXP == R_UnboundValue || varSEXP == R_MissingArg)

return false;

// ensure we're working with a primitive R environment

if (!isEnvironment(varSEXP))

return false;

error = asPrimitiveEnvironment(varSEXP, &varSEXP, &protect);

if (error)

return false;

// avoid cycles

if (pVisitedObjects->count(varSEXP)) return false;

pVisitedObjects->insert(varSEXP);

// list the bindings in this object

SEXP bindingsSEXP;

protect.add(bindingsSEXP = R_lsInternal(varSEXP, TRUE));

// iterate over items and search for active bindings

for (int i = 0, n = Rf_length(bindingsSEXP); i < n; ++i)

{

const char* binding = CHAR(STRING_ELT(bindingsSEXP, i));

if (hasActiveBindingImpl(binding, varSEXP, pVisitedObjects))

return true;

}

// no child binding has active binding; return false

return false;

}

} // end anonymous namespace

bool hasActiveBinding(const std::string& name, const SEXP envirSEXP)

{

// avoid cycles when searching recursively

std::set<SEXP> visitedObjects;

return hasActiveBindingImpl(name, envirSEXP, &visitedObjects);

}

bool isActiveBinding(const std::string& name, const SEXP env)

{

// R_BindingIsActive throws error on .Last.value check; avoid that and

// just assume that it's not an active binding (and hence is okay to eval)

if (name == ".Last.value")

return false;

return R_BindingIsActive(Rf_install(name.c_str()), env);

}

SEXP functionBody(SEXP functionSEXP)

{

if (!Rf_isFunction(functionSEXP))

return R_NilValue;

if (Rf_isPrimitive(functionSEXP))

return R_NilValue;

SEXP bodySEXP = R_NilValue;

Protect protect;

RFunction getBody("base:::body");

getBody.addParam(functionSEXP);

Error error = getBody.call(&bodySEXP, &protect);

if (error) LOG_ERROR(error);

return bodySEXP;

}

SEXP findVar(const std::string &name, const SEXP env)

{

return Rf_findVar(Rf_install(name.c_str()), env);

}

SEXP findVar(const std::string& name, const std::string& ns)

{

if (name.empty())

return R_UnboundValue;

if (!ns.empty())

if (!ensureNamespaceLoaded(ns))

return R_UnboundValue;

SEXP env = ns.empty() ? R_GlobalEnv : findNamespace(ns);

return findVar(name, env);

}

SEXP findFunction(const std::string& name, const std::string& ns)

{

r::sexp::Protect protect;

if (name.empty())

return R_UnboundValue;

if (!ns.empty())

if (!ensureNamespaceLoaded(ns))

return R_UnboundValue;

SEXP env = ns.empty() ? R_GlobalEnv : findNamespace(ns);

if (env == R_UnboundValue) return R_UnboundValue;

// We might want to use `Rf_findFun`, but it calls `Rf_error`

// on failure, which involves printing the error message out

// to the console. To avoid this,

// we instead attempt to find the function by manually

// walking through the environment (and its enclosing environments)

SEXP nameSEXP = Rf_install(name.c_str());

// Search through frames until we find the global environment.

while (env != R_EmptyEnv)

{

// If we're searching the global environment, then

// try using 'Rf_findVar', as this will attempt a search

// of R's own internal global cache.

if (env == R_GlobalEnv)

{

SEXP resultSEXP = Rf_findVar(nameSEXP, R_GlobalEnv);

if (Rf_isFunction(resultSEXP))

return resultSEXP;

else if (TYPEOF(resultSEXP) == PROMSXP)

{

protect.add(resultSEXP = Rf_eval(resultSEXP, env));

if (Rf_isFunction(resultSEXP))

return resultSEXP;

}

// Otherwise, just perform a simple search through

// the current frame.

SEXP resultSEXP = Rf_findVarInFrame(env, nameSEXP);

if (resultSEXP != R_UnboundValue)

{

if (Rf_isFunction(resultSEXP))

return resultSEXP;

else if (TYPEOF(resultSEXP) == PROMSXP)

{

protect.add(resultSEXP = Rf_eval(resultSEXP, env));

if (Rf_isFunction(resultSEXP))

return resultSEXP;

}

env = ENCLOS(env);

}

return R_UnboundValue;

}

std::string typeAsString(SEXP object)

{

return Rf_type2char(TYPEOF(object));

}

std::string classOf(SEXP objectSEXP)

{

return asString(Rf_getAttrib(objectSEXP, Rf_install("class")));

}

int length(SEXP object)

{

return Rf_length(object);

}

bool isLanguage(SEXP object)

{

return Rf_isLanguage(object);

}

bool isList(SEXP object)

{

return TYPEOF(object) == VECSXP;

}

bool isString(SEXP object)

{

return Rf_isString(object);

}

bool isMatrix(SEXP object)

{

return Rf_isMatrix(object);

}

bool isDataFrame(SEXP object)

{

return Rf_isFrame(object);

}

bool isNull(SEXP object)

{

return Rf_isNull(object) == TRUE;

}

bool isPrimitiveEnvironment(SEXP object)

{

return TYPEOF(object) == ENVSXP;

}

bool isEnvironment(SEXP object)

{

// detect primitive environments (fast path)

if (isPrimitiveEnvironment(object))

return true;

// call back to R to detect objects subclassing environment

if (TYPEOF(object) == S4SXP)

{

bool result = false;

Error error = RFunction("base:::is.environment")

.addParam(object)

.call(&result);

if (error)

LOG_ERROR(error);

return result;

}

return false;

}

SEXP getNames(SEXP sexp)

{

return Rf_getAttrib(sexp, R_NamesSymbol);

}

bool setNames(SEXP sexp, const std::vector<std::string>& names)

{

std::size_t n = names.size();

if (static_cast<std::size_t>(Rf_length(sexp)) != n)

return false;

Rf_setAttrib(sexp,

R_NamesSymbol,

Rf_allocVector(STRSXP, names.size()));

SEXP namesSEXP = Rf_getAttrib(sexp, R_NamesSymbol);

for (std::size_t i = 0; i < n; ++i)

SET_STRING_ELT(namesSEXP, i, Rf_mkChar(names[i].c_str()));

return true;

}

Error getNames(SEXP sexp, std::vector<std::string>* pNames)

{

// attempt to get the field names

SEXP namesSEXP = getNames(sexp);

if (namesSEXP == R_NilValue || TYPEOF(namesSEXP) != STRSXP)

return Error(errc::UnexpectedDataTypeError, ERROR_LOCATION);

else if (Rf_length(namesSEXP) != Rf_length(sexp))

return Error(errc::UnexpectedDataTypeError, ERROR_LOCATION);

// copy them into the vector

for (int i=0; i<Rf_length(namesSEXP); i++)

pNames->push_back(Rf_translateChar(STRING_ELT(namesSEXP, i)) );

return Success();

}

SEXP getAttrib(SEXP object, SEXP attrib)

{

return Rf_getAttrib(object, attrib);

}

SEXP getAttrib(SEXP object, const std::string& attrib)

{

return getAttrib(object, Rf_install(attrib.c_str()));

}

SEXP setAttrib(SEXP object, const std::string& attrib, SEXP val)

{

return Rf_setAttrib(object, Rf_install(attrib.c_str()), val);

}

bool isExternalPointer(SEXP object)

{

return TYPEOF(object) == EXTPTRSXP;

}

bool isNullExternalPointer(SEXP object)

{

return

isExternalPointer(object) &&

R_ExternalPtrAddr(object) == NULL;

}

SEXP makeWeakRef(SEXP key, SEXP val, R_CFinalizer_t fun, Rboolean onexit)

{

return R_MakeWeakRefC(key, val, fun, onexit);

}

void registerFinalizer(SEXP s, R_CFinalizer_t fun)

{

R_RegisterCFinalizer(s, fun);

}

SEXP makeExternalPtr(void* ptr, R_CFinalizer_t fun, Protect* pProtect)

{

SEXP s = R_MakeExternalPtr(ptr, R_NilValue, R_NilValue);

if (pProtect)

pProtect->add(s);

registerFinalizer(s, fun);

return s;

}

void* getExternalPtrAddr(SEXP extptr)

{

return R_ExternalPtrAddr(extptr);

}

void clearExternalPtr(SEXP extptr)

{

R_ClearExternalPtr(extptr);

}

core::Error getNamedListSEXP(SEXP listSEXP,

const std::string& name,

SEXP* pValueSEXP)

{

int valueIndex = indexOfElementNamed(listSEXP, name);

if (valueIndex != -1)

{

// get the appropriate value

*pValueSEXP = VECTOR_ELT(listSEXP, valueIndex);

return core::Success();

}

else

{

// otherwise an error

core::Error error(r::errc::ListElementNotFoundError, ERROR_LOCATION);

error.addProperty("element", name);

return error;

}

Error extract(SEXP valueSEXP, int* pInt)

{

if (TYPEOF(valueSEXP) != INTSXP)

return Error(errc::UnexpectedDataTypeError, ERROR_LOCATION);

if (Rf_length(valueSEXP) < 1)

return Error(errc::NoDataAvailableError, ERROR_LOCATION);

*pInt = INTEGER(valueSEXP)[0] ;

return Success();

}

Error extract(SEXP valueSEXP, bool* pBool)

{

if (TYPEOF(valueSEXP) != LGLSXP)

return Error(errc::UnexpectedDataTypeError, ERROR_LOCATION);

if (Rf_length(valueSEXP) < 1)

return Error(errc::NoDataAvailableError, ERROR_LOCATION);

*pBool = LOGICAL(valueSEXP)[0] == TRUE ? true : false ;

return Success();

}

Error extract(SEXP valueSEXP, double* pDouble)

{

if (TYPEOF(valueSEXP) != REALSXP)

return Error(errc::UnexpectedDataTypeError, ERROR_LOCATION);

if (Rf_length(valueSEXP) < 1)

return Error(errc::NoDataAvailableError, ERROR_LOCATION);

*pDouble = REAL(valueSEXP)[0];

return Success();

}

Error extract(SEXP valueSEXP, std::vector<int>* pVector)

{

if (TYPEOF(valueSEXP) != INTSXP)

return Error(errc::UnexpectedDataTypeError, ERROR_LOCATION);

pVector->clear();

for (int i=0; i<Rf_length(valueSEXP); i++)

pVector->push_back(INTEGER(valueSEXP)[i]);

return Success();

}

Error extract(SEXP valueSEXP, std::string* pString, bool asUtf8)

{

if (TYPEOF(valueSEXP) != STRSXP)

return Error(errc::UnexpectedDataTypeError, ERROR_LOCATION);

if (Rf_length(valueSEXP) < 1)

return Error(errc::NoDataAvailableError, ERROR_LOCATION);

*pString = std::string(asUtf8 ?

Rf_translateCharUTF8(STRING_ELT(valueSEXP, 0)) :

Rf_translateChar(STRING_ELT(valueSEXP, 0)));

return Success();

}

Error extract(SEXP valueSEXP, std::vector<std::string>* pVector)

{

if (TYPEOF(valueSEXP) != STRSXP)

return Error(errc::UnexpectedDataTypeError, ERROR_LOCATION);

pVector->clear();

for (int i=0; i<Rf_length(valueSEXP); i++)

pVector->push_back(Rf_translateChar(STRING_ELT(valueSEXP, i)));

return Success();

}

Error extract(SEXP valueSEXP, std::set<std::string>* pSet)

{

if (TYPEOF(valueSEXP) != STRSXP)

return Error(errc::UnexpectedDataTypeError, ERROR_LOCATION);

pSet->clear();

for (int i=0; i<Rf_length(valueSEXP); i++)

pSet->insert(Rf_translateChar(STRING_ELT(valueSEXP, i)));

return Success();

}

Error extract(SEXP valueSEXP, std::map< std::string, std::set<std::string> >* pMap)

{

if (TYPEOF(valueSEXP) != VECSXP)

return Error(errc::UnexpectedDataTypeError, ERROR_LOCATION);

if (Rf_length(valueSEXP) == 0)

return Success();

SEXP namesSEXP = r::sexp::getNames(valueSEXP);

if (Rf_isNull(namesSEXP))

return Error(errc::UnexpectedDataTypeError, ERROR_LOCATION);

for (int i = 0; i < Rf_length(valueSEXP); ++i)

{

SEXP el = VECTOR_ELT(valueSEXP, i);

std::set<std::string> contents;

for (int j = 0; j < Rf_length(el); ++j)

contents.insert(std::string(Rf_translateChar(STRING_ELT(el, j))));

std::string name = std::string(Rf_translateChar(STRING_ELT(namesSEXP, i)));

pMap->operator [](name) = contents;

}

return Success();

}

SEXP create(SEXP valueSEXP, Protect* pProtect)

{

pProtect->add(valueSEXP);

return valueSEXP;

}

SEXP create(const json::Value& value, Protect* pProtect)

{

// call embedded create function based on type

if (value.type() == json::StringType)

{

return create(value.get_str(), pProtect);

}

else if (value.type() == json::IntegerType)

{

return create(value.get_int(), pProtect);

}

else if (value.type() == json::RealType)

{

return create(value.get_real(), pProtect);

}

else if (value.type() == json::BooleanType)

{

return create(value.get_bool(), pProtect);

}

else if (value.type() == json::ArrayType)

{

return create(value.get_array(), pProtect);

}

else if (value.type() == json::ObjectType)

{

return create(value.get_obj(), pProtect);

}

else if (value.is_null())

{

return R_NilValue;

}

else

{

return R_NilValue;

}

SEXP create(const char* value, Protect* pProtect)

{

return create(std::string(value), pProtect);

}

SEXP create(const std::string& value, Protect* pProtect)

{

SEXP valueSEXP;

pProtect->add(valueSEXP = Rf_allocVector(STRSXP, 1));

SET_STRING_ELT(valueSEXP, 0, Rf_mkChar(value.c_str()));

return valueSEXP;

}

SEXP create(int value, Protect* pProtect)

{

SEXP valueSEXP;

pProtect->add(valueSEXP = Rf_allocVector(INTSXP, 1));

INTEGER(valueSEXP)[0] = value ;

return valueSEXP;

}

SEXP create(double value, Protect* pProtect)

{

SEXP valueSEXP;

pProtect->add(valueSEXP = Rf_allocVector(REALSXP, 1));

REAL(valueSEXP)[0] = value ;

return valueSEXP;

}

SEXP create(bool value, Protect* pProtect)

{

SEXP valueSEXP;

pProtect->add(valueSEXP = Rf_allocVector(LGLSXP, 1));

LOGICAL(valueSEXP)[0] = value ;

return valueSEXP;

}

SEXP create(const json::Array& value, Protect* pProtect)

{

// create the list

SEXP listSEXP;

pProtect->add(listSEXP = Rf_allocVector(VECSXP, value.size()));

// add each array element to it

for (json::Array::size_type i=0; i<value.size(); i++)

{

SEXP valueSEXP = create(value[i], pProtect);

SET_VECTOR_ELT(listSEXP, i, valueSEXP);

}

return listSEXP;

}

SEXP create(const json::Object& value, Protect* pProtect)

{

// create the list

SEXP listSEXP ;

pProtect->add(listSEXP = Rf_allocVector(VECSXP, value.size()));

// build list of names

SEXP namesSEXP ;

pProtect->add(namesSEXP = Rf_allocVector(STRSXP, value.size()));

// add each object field to it

int index = 0;

for (json::Object::const_iterator

it = value.begin();

it != value.end();

++it)

{

// set name

SET_STRING_ELT(namesSEXP, index, Rf_mkChar(it->first.c_str()));

// set value

SEXP valueSEXP = create(it->second, pProtect);

SET_VECTOR_ELT(listSEXP, index, valueSEXP);

// increment element index

index++;

}

// attach names

Rf_setAttrib(listSEXP, R_NamesSymbol, namesSEXP);

// return the list

return listSEXP;

}

SEXP create(const std::vector<std::string>& value, Protect* pProtect)

{

SEXP valueSEXP;

pProtect->add(valueSEXP = Rf_allocVector(STRSXP, value.size()));

int index = 0;

for (std::vector<std::string>::const_iterator

it = value.begin(); it != value.end(); ++it)

{

SET_STRING_ELT(valueSEXP, index++, Rf_mkChar(it->c_str()));

}

return valueSEXP;

}

SEXP create(const std::vector<int>& value, Protect *pProtect)

{

SEXP valueSEXP;

pProtect->add(valueSEXP = Rf_allocVector(INTSXP, value.size()));

for (std::size_t i = 0; i < value.size(); ++i)

INTEGER(valueSEXP)[i] = value[i] ;

return valueSEXP;

}

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rstudio/src/cpp/r/RSexp.cpp at master · andschar/rstudio · GitHub

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