https://github.com/cran/Rcpp
Tip revision: 32dc2f05ef76da10ba2d1b539327509399f325d2 authored by Dirk Eddelbuettel on 23 March 2013, 17:05:30 UTC
version 0.10.3
version 0.10.3
Tip revision: 32dc2f0
attributes.cpp
// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; indent-tabs-mode: nil; -*-
//
// attributes.cpp: Rcpp R/C++ interface class library -- Rcpp attributes
//
// Copyright (C) 2012 JJ Allaire, 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/>.
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <cstring>
#include <string>
#include <vector>
#include <map>
#include <set>
#include <algorithm>
#include <fstream>
#include <sstream>
#define RCPP_NO_SUGAR
#include <Rcpp.h>
/*******************************************************************
* AttributesUtil.h
*******************************************************************/
namespace Rcpp {
namespace attributes {
// Utility class for getting file existence and last modified time
class FileInfo {
public:
explicit FileInfo(const std::string& path);
std::string path() const { return path_; }
bool exists() const { return exists_; }
time_t lastModified() const { return lastModified_; }
private:
std::string path_;
bool exists_;
time_t lastModified_;
};
// Remove a file
bool removeFile(const std::string& path);
// Recursively create a directory
void createDirectory(const std::string& path);
// Known whitespace chars
extern const char * const kWhitespaceChars;
// Query whether a character is whitespace
bool isWhitespace(char ch);
// Trim a string
void trimWhitespace(std::string* pStr);
// Strip balanced quotes from around a string (assumes already trimmed)
void stripQuotes(std::string* pStr);
// is the passed string quoted?
bool isQuoted(const std::string& str);
// show a warning message
void showWarning(const std::string& msg);
} // namespace attributes
} // namespace Rcpp
/*******************************************************************
* AttributesTypes.h
*******************************************************************/
namespace Rcpp {
namespace attributes {
// Known attribute names & parameters
const char * const kExportAttribute = "export";
const char * const kDependsAttribute = "depends";
const char * const kPluginsAttribute = "plugins";
const char * const kInterfacesAttribute = "interfaces";
const char * const kInterfaceR = "r";
const char * const kInterfaceCpp = "cpp";
// Type info
class Type {
public:
Type() {}
Type(const std::string& name, bool isConst, bool isReference)
: name_(name), isConst_(isConst), isReference_(isReference)
{
}
bool empty() const { return name().empty(); }
const std::string& name() const { return name_; }
bool isVoid() const { return name() == "void"; }
bool isConst() const { return isConst_; }
bool isReference() const { return isReference_; }
private:
std::string name_;
bool isConst_;
bool isReference_;
};
// Argument info
class Argument {
public:
Argument() {}
Argument(const std::string& name,
const Type& type,
const std::string& defaultValue)
: name_(name), type_(type), defaultValue_(defaultValue)
{
}
bool empty() const { return type().empty(); }
const std::string& name() const { return name_; }
const Type& type() const { return type_; }
const std::string& defaultValue() const { return defaultValue_; }
private:
std::string name_;
Type type_;
std::string defaultValue_;
};
// Function info
class Function {
public:
Function() {}
Function(const Type& type,
const std::string& name,
const std::vector<Argument>& arguments,
const std::string& source)
: type_(type), name_(name), arguments_(arguments), source_(source)
{
}
Function renamedTo(const std::string& name) const {
return Function(type(), name, arguments(), source());
}
std::string signature() const { return signature(name()); }
std::string signature(const std::string& name) const;
bool isHidden() const {
return name().find_first_of('.') == 0;
}
bool empty() const { return name().empty(); }
const Type& type() const { return type_; }
const std::string& name() const { return name_; }
const std::vector<Argument>& arguments() const { return arguments_; }
const std::string& source() const { return source_; }
private:
Type type_;
std::string name_;
std::vector<Argument> arguments_;
std::string source_;
};
// Attribute parameter (with optional value)
class Param {
public:
Param() {}
explicit Param(const std::string& paramText);
bool empty() const { return name().empty(); }
const std::string& name() const { return name_; }
const std::string& value() const { return value_; }
private:
std::string name_;
std::string value_;
};
// Attribute (w/ optional params and signature of function it qualifies)
class Attribute {
public:
Attribute() {}
Attribute(const std::string& name,
const std::vector<Param>& params,
const Function& function,
const std::vector<std::string>& roxygen)
: name_(name), params_(params), function_(function), roxygen_(roxygen)
{
}
bool empty() const { return name().empty(); }
const std::string& name() const { return name_; }
const std::vector<Param>& params() const { return params_; }
Param paramNamed(const std::string& name) const;
bool hasParameter(const std::string& name) const {
return !paramNamed(name).empty();
}
const Function& function() const { return function_; }
bool isExportedFunction() const {
return (name() == kExportAttribute) && !function().empty();
}
std::string exportedName() const {
if (!params().empty())
return params()[0].name();
else
return function().name();
}
const std::vector<std::string>& roxygen() const { return roxygen_; }
private:
std::string name_;
std::vector<Param> params_;
Function function_;
std::vector<std::string> roxygen_;
};
// Operator << for parsed types
std::ostream& operator<<(std::ostream& os, const Type& type);
std::ostream& operator<<(std::ostream& os, const Argument& argument);
std::ostream& operator<<(std::ostream& os, const Function& function);
std::ostream& operator<<(std::ostream& os, const Param& param);
std::ostream& operator<<(std::ostream& os, const Attribute& attribute);
// interface to source file attributes
class SourceFileAttributes
{
public:
virtual ~SourceFileAttributes() {};
virtual const std::string& sourceFile() const = 0;
virtual bool hasInterface(const std::string& name) const = 0;
typedef std::vector<Attribute>::const_iterator const_iterator;
virtual const_iterator begin() const = 0;
virtual const_iterator end() const = 0;
virtual const std::vector<std::string>& modules() const = 0;
virtual const std::vector<std::vector<std::string> >& roxygenChunks() const = 0;
virtual bool hasGeneratorOutput() const = 0;
};
} // namespace attributes
} // namespace Rcpp
/*******************************************************************
* AttributesParser.h
*******************************************************************/
namespace Rcpp {
namespace attributes {
// Helper class for determining whether we are in a comment
class CommentState {
public:
CommentState() : inComment_(false) {}
private:
// prohibit copying
CommentState(const CommentState&);
CommentState& operator=(const CommentState&);
public:
bool inComment() const { return inComment_; }
void submitLine(const std::string& line);
void reset() { inComment_ = false; }
private:
bool inComment_;
};
// Class used to parse and return attribute information from a source file
class SourceFileAttributesParser : public SourceFileAttributes {
public:
explicit SourceFileAttributesParser(const std::string& sourceFile);
private:
// prohibit copying
SourceFileAttributesParser(const SourceFileAttributesParser&);
SourceFileAttributesParser& operator=(const SourceFileAttributesParser&);
public:
// implemetnation of SourceFileAttributes interface
virtual const std::string& sourceFile() const {
return sourceFile_;
}
virtual const_iterator begin() const { return attributes_.begin(); }
virtual const_iterator end() const { return attributes_.end(); }
virtual const std::vector<std::string>& modules() const
{
return modules_;
}
virtual const std::vector<std::vector<std::string> >& roxygenChunks() const {
return roxygenChunks_;
}
virtual bool hasGeneratorOutput() const
{
return !attributes_.empty() ||
!modules_.empty() ||
!roxygenChunks_.empty();
}
virtual bool hasInterface(const std::string& name) const {
for (const_iterator it=begin(); it != end(); ++it) {
if (it->name() == kInterfacesAttribute) {
return it->hasParameter(name);
}
}
// if there's no interfaces attrbute we default to R
if (name == kInterfaceR)
return true;
else
return false;
}
// Get lines of embedded R code
const std::vector<std::string>& embeddedR() const {
return embeddedR_;
}
private:
// Parsing helpers
Attribute parseAttribute(const std::vector<std::string>& match,
int lineNumber);
std::vector<Param> parseParameters(const std::string& input);
Function parseFunction(size_t lineNumber);
std::string parseSignature(size_t lineNumber);
std::vector<std::string> parseArguments(const std::string& argText);
Type parseType(const std::string& text);
// Validation helpers
bool isKnownAttribute(const std::string& name) const;
void attributeWarning(const std::string& message,
const std::string& attribute,
size_t lineNumber);
void attributeWarning(const std::string& message, size_t lineNumber);
void rcppExportWarning(const std::string& message, size_t lineNumber);
void rcppExportNoFunctionFoundWarning(size_t lineNumber);
void rcppExportInvalidParameterWarning(const std::string& param,
size_t lineNumber);
void rcppInterfacesWarning(const std::string& message,
size_t lineNumber);
private:
std::string sourceFile_;
CharacterVector lines_;
std::vector<Attribute> attributes_;
std::vector<std::string> modules_;
std::vector<std::string> embeddedR_;
std::vector<std::vector<std::string> > roxygenChunks_;
std::vector<std::string> roxygenBuffer_;
};
} // namespace attributes
} // namespace Rcpp
/*******************************************************************
* AttributesGen.h
*******************************************************************/
namespace Rcpp {
namespace attributes {
// Abstract class which manages writing of code for compileAttributes
class ExportsGenerator {
protected:
ExportsGenerator(const std::string& targetFile,
const std::string& package,
const std::string& commentPrefix);
private:
// prohibit copying
ExportsGenerator(const ExportsGenerator&);
ExportsGenerator& operator=(const ExportsGenerator&);
public:
virtual ~ExportsGenerator() {}
// Name of target file and package
const std::string& targetFile() const { return targetFile_; }
const std::string& package() const { return package_; }
// Abstract interface for code generation
virtual void writeBegin() = 0;
void writeFunctions(const SourceFileAttributes& attributes,
bool verbose); // see doWriteFunctions below
virtual void writeEnd() = 0;
virtual bool commit(const std::vector<std::string>& includes) = 0;
// Remove the generated file entirely
bool remove();
// Allow generator to appear as a std::ostream&
operator std::ostream&() {
return codeStream_;
}
protected:
// Allow access to the output stream
std::ostream& ostr() {
return codeStream_;
}
bool hasCppInterface() const {
return hasCppInterface_;
}
// Shared knowledge about function namees
std::string exportValidationFunction() {
return "RcppExport_validate";
}
std::string exportValidationFunctionRegisteredName() {
return package() + "_" + exportValidationFunction();
}
std::string registerCCallableExportedName() {
return package() + "_RcppExport_registerCCallable";
}
// Commit the stream -- is a no-op if the existing code is identical
// to the generated code. Returns true if data was written and false
// if it wasn't (throws exception on io error)
bool commit(const std::string& preamble = std::string());
private:
// Private virtual for doWriteFunctions so the base class
// can always intercept writeFunctions
virtual void doWriteFunctions(const SourceFileAttributes& attributes,
bool verbose) = 0;
// Check whether it's safe to overwrite this file (i.e. whether we
// generated the file in the first place)
bool isSafeToOverwrite() const {
return existingCode_.empty() ||
(existingCode_.find(generatorToken()) != std::string::npos);
}
// UUID that we write into a comment within the file (so that we can
// strongly identify that a file was generated by us before overwriting it)
std::string generatorToken() const {
return "10BE3573-1514-4C36-9D1C-5A225CD40393";
}
private:
std::string targetFile_;
std::string package_;
std::string commentPrefix_;
std::string existingCode_;
std::ostringstream codeStream_;
bool hasCppInterface_;
};
// Class which manages generating RcppExports.cpp
class CppExportsGenerator : public ExportsGenerator {
public:
explicit CppExportsGenerator(const std::string& packageDir,
const std::string& package,
const std::string& fileSep);
virtual void writeBegin() {};
virtual void writeEnd();
virtual bool commit(const std::vector<std::string>& includes);
private:
virtual void doWriteFunctions(const SourceFileAttributes& attributes,
bool verbose);
std::string registerCCallable(size_t indent,
const std::string& exportedName,
const std::string& name) const;
private:
std::vector<Attribute> cppExports_;
};
// Class which manages generating PackageName_RcppExports.h header file
class CppExportsIncludeGenerator : public ExportsGenerator {
public:
CppExportsIncludeGenerator(const std::string& packageDir,
const std::string& package,
const std::string& fileSep);
virtual void writeBegin();
virtual void writeEnd();
virtual bool commit(const std::vector<std::string>& includes);
private:
virtual void doWriteFunctions(const SourceFileAttributes& attributes,
bool verbose);
std::string getCCallable(const std::string& function) const;
std::string getHeaderGuard() const;
private:
std::string includeDir_;
};
// Class which manages generating PackageName_RcppExports.h header file
class CppPackageIncludeGenerator : public ExportsGenerator {
public:
CppPackageIncludeGenerator(const std::string& packageDir,
const std::string& package,
const std::string& fileSep);
virtual void writeBegin() {}
virtual void writeEnd();
virtual bool commit(const std::vector<std::string>& includes);
private:
virtual void doWriteFunctions(const SourceFileAttributes& attributes,
bool verbose) {}
std::string getHeaderGuard() const;
private:
std::string includeDir_;
};
// Class which manages generator RcppExports.R
class RExportsGenerator : public ExportsGenerator {
public:
RExportsGenerator(const std::string& packageDir,
const std::string& package,
const std::string& fileSep);
virtual void writeBegin() {}
virtual void writeEnd();
virtual bool commit(const std::vector<std::string>& includes);
private:
virtual void doWriteFunctions(const SourceFileAttributes& attributes,
bool verbose);
};
// Class to manage and dispatch to a list of generators
class ExportsGenerators {
public:
typedef std::vector<ExportsGenerator*>::iterator Itr;
ExportsGenerators() {}
virtual ~ExportsGenerators();
void add(ExportsGenerator* pGenerator);
void writeBegin();
void writeFunctions(const SourceFileAttributes& attributes,
bool verbose);
void writeEnd();
// Commit and return a list of the files that were updated
std::vector<std::string> commit(
const std::vector<std::string>& includes);
// Remove and return a list of files that were removed
std::vector<std::string> remove();
private:
// prohibit copying
ExportsGenerators(const ExportsGenerators&);
ExportsGenerators& operator=(const ExportsGenerators&);
private:
std::vector<ExportsGenerator*> generators_;
};
// Standalone generation helpers (used by sourceCpp)
std::string generateRArgList(const Function& function);
void generateCpp(std::ostream& ostr,
const SourceFileAttributes& attributes,
bool includePrototype,
bool cppInterface,
const std::string& contextId);
} // namespace attributes
} // namespace Rcpp
/*******************************************************************
* AttributesParser.cpp
*******************************************************************/
namespace Rcpp {
namespace attributes {
namespace {
Rcpp::List regexMatches(Rcpp::CharacterVector lines,
const std::string& regex)
{
Rcpp::Environment base("package:base");
Rcpp::Function regexec = base["regexec"];
Rcpp::Function regmatches = base["regmatches"];
Rcpp::RObject result = regexec(regex, lines);
Rcpp::List matches = regmatches(lines, result);
return matches;
}
// Parse embedded R code chunks from a file (receives the lines of the
// file as a CharcterVector for using with regexec and as a standard
// stl vector for traversal/insepection)
std::vector<std::string> parseEmbeddedR(
Rcpp::CharacterVector linesVector,
const std::deque<std::string>& lines) {
Rcpp::List matches = regexMatches(linesVector,
"^\\s*/\\*{3,}\\s+[Rr]\\s*$");
bool withinRBlock = false;
CommentState commentState;
std::vector<std::string> embeddedR;
for (int i = 0; i<matches.size(); i++) {
// track comment state
std::string line = lines[i];
commentState.submitLine(line);
// is this a line that begins an R code block?
const Rcpp::CharacterVector match = matches[i];
bool beginRBlock = match.size() > 0;
// check state and do the right thing
if (beginRBlock) {
withinRBlock = true;
}
else if (withinRBlock) {
if (commentState.inComment())
embeddedR.push_back(line);
else
withinRBlock = false;
}
}
return embeddedR;
}
} // anonymous namespace
// Generate a type signature for the function with the provided name
// (type signature == function pointer declaration)
std::string Function::signature(const std::string& name) const {
std::ostringstream ostr;
ostr << type() << "(*" << name << ")(";
const std::vector<Argument>& args = arguments();
for (std::size_t i = 0; i<args.size(); i++) {
ostr << args[i].type();
if (i != (args.size()-1))
ostr << ",";
}
ostr << ")";
return ostr.str();
}
// Parse attribute parameter from parameter text
Param::Param(const std::string& paramText)
{
// parse out name/value pair if there is one
std::string::size_type pos = paramText.find("=") ;
if ( pos != std::string::npos ) {
// name
name_ = paramText.substr(0, pos);
trimWhitespace(&name_);
// value
value_ = paramText.substr(pos + 1) ;
trimWhitespace(&value_);
stripQuotes(&value_);
}
else {
name_ = paramText;
stripQuotes(&name_);
}
}
// Check if the attribute has a parameter of a paricular name
Param Attribute::paramNamed(const std::string& name) const {
for (std::vector<Param>::const_iterator
it = params_.begin(); it != params_.end(); ++it) {
if (it->name() == name)
return *it;
}
return Param();
}
// Type operator <<
std::ostream& operator<<(std::ostream& os, const Type& type) {
if (!type.empty()) {
if (type.isConst())
os << "const ";
os << type.name();
if (type.isReference())
os << "&";
}
return os;
}
// Argument operator <<
std::ostream& operator<<(std::ostream& os, const Argument& argument) {
if (!argument.empty()) {
os << argument.type();
if (!argument.name().empty()) {
os << " ";
os << argument.name();
if (!argument.defaultValue().empty())
os << " = " << argument.defaultValue();
}
}
return os;
}
// Function operator <<
std::ostream& operator<<(std::ostream& os, const Function& function) {
if (!function.empty()) {
if (!function.type().empty()) {
os << function.type();
os << " ";
}
os << function.name();
os << "(";
const std::vector<Argument>& arguments = function.arguments();
for (std::size_t i = 0; i<arguments.size(); i++) {
os << arguments[i];
if (i != (arguments.size()-1))
os << ", ";
}
os << ")";
}
return os;
}
// Param operator <<
std::ostream& operator<<(std::ostream& os, const Param& param) {
if (!param.empty()) {
os << param.name();
if (!param.value().empty())
os << "=" << param.value();
}
return os;
}
// Attribute operator <<
std::ostream& operator<<(std::ostream& os, const Attribute& attribute) {
if (!attribute.empty()) {
os << "[[Rcpp::" << attribute.name();
const std::vector<Param>& params = attribute.params();
if (params.size() > 0) {
os << "(";
for (std::size_t i = 0; i<params.size(); i++) {
os << params[i];
if (i != (params.size()-1))
os << ",";
}
os << ")";
}
os << "]]";
if (!attribute.function().empty())
os << " " << attribute.function();
}
return os;
}
// Parse the attributes from a source file
SourceFileAttributesParser::SourceFileAttributesParser
(const std::string& sourceFile)
: sourceFile_(sourceFile)
{
// First read the entire file into a std::stringstream so we can check
// it for attributes (we don't want to do any of our more expensive
// processing steps if there are no attributes to parse)
std::ifstream ifs(sourceFile_.c_str());
if (ifs.fail())
throw Rcpp::file_io_error(sourceFile_);
std::stringstream buffer;
buffer << ifs.rdbuf();
std::string contents = buffer.str();
// Check for attribute signature
if (contents.find("[[Rcpp::") != std::string::npos ||
contents.find("RCPP_MODULE") != std::string::npos) {
// Now read into a list of strings (which we can pass to regexec)
// First read into a std::deque (which will handle lots of append
// operations efficiently) then copy into an R chracter vector
std::string line;
std::deque<std::string> lines;
while(std::getline(buffer, line)) {
// strip \r (for the case of windows line terminators on posix)
if (line.length() > 0 && *line.rbegin() == '\r')
line.erase(line.length()-1, 1);
lines.push_back(line);
}
lines_ = Rcpp::wrap(lines);
// Scan for attributes
CommentState commentState;
Rcpp::List matches = regexMatches(lines_,
"^\\s*//\\s*\\[\\[Rcpp::(\\w+)(\\(.*?\\))?\\]\\]\\s*$");
for (int i = 0; i<matches.size(); i++) {
// track whether we are in a comment and bail if we are in one
std::string line = lines[i];
commentState.submitLine(line);
if (commentState.inComment())
continue;
// attribute line
const Rcpp::CharacterVector match = matches[i];
if (match.size() > 0) {
// if the match size isn't 3 then regmatches has not behaved
// as expected (it should return a vector of either 0 or 3
// elements). we don't ever expect this to occur but if it
// does let's not crash
if (match.size() != 3)
continue;
// add the attribute
attributes_.push_back(parseAttribute(
Rcpp::as<std::vector<std::string> >(match), i));
}
// if it's not an attribute line then it could still be a
// line of interest (e.g. roxygen comment)
else {
// save roxygen comments
if (line.find("//'") == 0) {
std::string roxLine = "#" + line.substr(2);
roxygenBuffer_.push_back(roxLine);
}
// a non-roxygen line causes us to clear the roxygen buffer
else if (!roxygenBuffer_.empty()) {
roxygenChunks_.push_back(roxygenBuffer_);
roxygenBuffer_.clear();
}
}
}
// Scan for Rcpp modules
commentState.reset();
Rcpp::List modMatches = regexMatches(lines_,
"^\\s*RCPP_MODULE\\s*\\(\\s*(\\w+)\\s*\\).*$");
for (int i = 0; i<modMatches.size(); i++) {
// track whether we are in a comment and bail if we are in one
std::string line = lines[i];
commentState.submitLine(line);
if (commentState.inComment())
continue;
// get the module declaration
Rcpp::CharacterVector match = modMatches[i];
if (match.size() > 0) {
const char * name = match[1];
modules_.push_back(name);
}
}
// Parse embedded R
embeddedR_ = parseEmbeddedR(lines_, lines);
}
}
// Parse an attribute from the vector returned by regmatches
Attribute SourceFileAttributesParser::parseAttribute(
const std::vector<std::string>& match,
int lineNumber) {
// Attribute name
std::string name = match[1];
// Warn if this is an unknown attribute
if (!isKnownAttribute(name)) {
attributeWarning("Unrecognized attribute Rcpp::" + name,
lineNumber);
}
// Extract params if we've got them
std::vector<Param> params;
std::string paramsText = match[2];
if (!paramsText.empty()) {
// we know from the regex that it's enclosed in parens so remove
// trim before we do this just in case someone updates the regex
// to allow for whitespace around the call
trimWhitespace(¶msText);
paramsText = paramsText.substr(1, paramsText.size()-2);
// parse the parameters
params = parseParameters(paramsText);
}
// Extract function signature if this is a function attribute
// and it doesn't appear at the end of the file
Function function;
// special handling for export
if (name == kExportAttribute) {
// parse the function (unless we are at the end of the file in
// which case we print a warning)
if ((lineNumber + 1) < lines_.size())
function = parseFunction(lineNumber + 1);
else
rcppExportWarning("No function found", lineNumber);
}
// validate interfaces parameter
else if (name == kInterfacesAttribute) {
if (params.empty()) {
rcppInterfacesWarning("No interfaces specified", lineNumber);
}
else {
for (std::size_t i=0; i<params.size(); i++) {
std::string param = params[i].name();
if (param != kInterfaceR && param != kInterfaceCpp) {
rcppInterfacesWarning(
"Unknown interface '" + param + "'", lineNumber);
}
}
}
}
// Return attribute
Attribute attribute = Attribute(name, params, function, roxygenBuffer_);
roxygenBuffer_.clear();
return attribute;
}
// Parse attribute parameters
std::vector<Param> SourceFileAttributesParser::parseParameters(
const std::string& input) {
const std::string delimiters(" ,");
std::vector<Param> params;
std::string::size_type current;
std::string::size_type next = -1;
do {
next = input.find_first_not_of(delimiters, next + 1);
if (next == std::string::npos)
break;
next -= 1;
current = next + 1;
next = input.find_first_of(delimiters, current);
params.push_back(Param(input.substr(current, next - current)));
} while(next != std::string::npos);
return params;
}
// Parse a function from the specified spot in the source file
Function SourceFileAttributesParser::parseFunction(size_t lineNumber) {
// Establish the text to parse for the signature
std::string signature = parseSignature(lineNumber);
if (signature.empty()) {
rcppExportNoFunctionFoundWarning(lineNumber);
return Function();
}
// Start at the end and look for the () that deliniates the arguments
// (bail with an empty result if we can't find them)
std::string::size_type endParenLoc = signature.find_last_of(')');
std::string::size_type beginParenLoc = signature.find_first_of('(');
if (endParenLoc == std::string::npos ||
beginParenLoc == std::string::npos ||
endParenLoc < beginParenLoc) {
rcppExportNoFunctionFoundWarning(lineNumber);
return Function();
}
// Find the type and name by scanning backwards for the whitespace that
// delimites the type and name
Type type;
std::string name;
const std::string preambleText = signature.substr(0, beginParenLoc);
for (std::string::const_reverse_iterator
it = preambleText.rbegin(); it != preambleText.rend(); ++it) {
char ch = *it;
if (isWhitespace(ch)) {
if (!name.empty()) {
// we are at the break between type and name so we can also
// extract the type
std::string typeText;
while (++it != preambleText.rend())
typeText.insert(0, 1, *it);
type = parseType(typeText);
// break (since we now have the name and the type)
break;
}
else
continue;
} else {
name.insert(0, 1, ch);
}
}
// If we didn't find a name then bail
if (name.empty()) {
rcppExportNoFunctionFoundWarning(lineNumber);
return Function();
}
// If we didn't find a type then bail
if (type.empty()) {
rcppExportWarning("No function return type found", lineNumber);
return Function();
}
// Now scan for arguments
std::vector<Argument> arguments;
std::string argsText = signature.substr(beginParenLoc + 1,
endParenLoc-beginParenLoc-1);
std::vector<std::string> args = parseArguments(argsText);
for (std::vector<std::string>::const_iterator it =
args.begin(); it != args.end(); ++it) {
// Get argument sans whitespace (bail if the arg is empty)
std::string arg = *it;
trimWhitespace(&arg);
if (arg.empty()) {
// we don't warn here because the compilation will fail anyway
continue;
}
// If the argument has an = within it then it has a default value
std::string defaultValue;
std::string::size_type eqPos = arg.find_first_of('=');
if ( (eqPos != std::string::npos) && ((eqPos + 1) < arg.size()) ) {
defaultValue = arg.substr(eqPos+1);
trimWhitespace(&defaultValue);
arg = arg.substr(0, eqPos);
trimWhitespace(&arg);
}
// Scan backwards for whitespace to determine where the type ends
// (we go backwards because whitespace is valid inside the type
// identifier but invalid inside the variable name). Note that if
// there is no whitespace we'll end up taking the whole string,
// which allows us to capture a type with no variable (but note
// we'll ultimately fail to parse types with no variable if they
// have embedded whitespace)
std::string::size_type pos = arg.find_last_of(kWhitespaceChars);
// check for name
std::string name;
if (pos != std::string::npos) {
name = arg.substr(pos);
trimWhitespace(&name);
}
if (name.empty()) {
rcppExportInvalidParameterWarning(arg, lineNumber);
return Function();
}
// check for type string
Type type = parseType(arg.substr(0, pos));
if (type.empty()) {
rcppExportInvalidParameterWarning(arg, lineNumber);
return Function();
}
// add argument
arguments.push_back(Argument(name, type, defaultValue));
}
return Function(type, name, arguments, signature);
}
// Parse the text of a function signature from the specified line
std::string SourceFileAttributesParser::parseSignature(size_t lineNumber) {
// Look for the next {
std::string signature;
for (int i = lineNumber; i<lines_.size(); i++) {
std::string line;
line = lines_[i];
std::string::size_type bracePos = line.find('{');
if (bracePos == std::string::npos) {
signature.append(line);
signature.push_back(' ');
} else {
signature.append(line.substr(0, bracePos));
return signature;
}
}
// Not found
return std::string();
}
// Parse arguments from function signature. This is tricky because commas
// are used to delimit arguments but are also valid inside template type
// qualifiers.
std::vector<std::string> SourceFileAttributesParser::parseArguments(
const std::string& argText) {
int templateCount = 0;
int parenCount = 0;
bool insideQuotes = false;
std::string currentArg;
std::vector<std::string> args;
char prevChar = 0;
for (std::string::const_iterator
it = argText.begin(); it != argText.end(); ++it) {
char ch = *it;
if (ch == '"' && prevChar != '\\') {
insideQuotes = !insideQuotes;
}
if ((ch == ',') &&
(templateCount == 0) &&
(parenCount == 0) &&
!insideQuotes) {
args.push_back(currentArg);
currentArg.clear();
continue;
} else {
currentArg.push_back(ch);
switch(ch) {
case '<':
templateCount++;
break;
case '>':
templateCount--;
break;
case '(':
parenCount++;
break;
case ')':
parenCount--;
break;
}
}
prevChar = ch;
}
if (!currentArg.empty())
args.push_back(currentArg);
return args;
}
Type SourceFileAttributesParser::parseType(const std::string& text) {
const std::string constQualifier("const");
const std::string referenceQualifier("&");
// trim whitespace
std::string type = text;
trimWhitespace(&type);
// check for const and reference
bool isConst = false;
bool isReference = false;
if (type.find(constQualifier) == 0) {
isConst = true;
type.erase(0, constQualifier.length());
}
// if the type is now empty (because it was detected as only const)
// then this is an invalid state so we bail
if (type.empty())
return Type();
if (type.find(referenceQualifier) ==
(type.length() - referenceQualifier.length())) {
isReference = true;
type.erase(type.length() - referenceQualifier.length());
}
trimWhitespace(&type);
// if the type is now empty because of some strange parse then bail
if (type.empty())
return Type();
return Type(type, isConst, isReference);
}
// Validation helpers
bool SourceFileAttributesParser::isKnownAttribute(const std::string& name)
const {
return name == kExportAttribute ||
name == kDependsAttribute ||
name == kPluginsAttribute ||
name == kInterfacesAttribute;
}
// Print an attribute parsing related warning
void SourceFileAttributesParser::attributeWarning(
const std::string& message,
const std::string& attribute,
size_t lineNumber) {
// get basename of source file for warning message
Rcpp::Function basename = Rcpp::Environment::base_env()["basename"];
std::string file = Rcpp::as<std::string>(basename(sourceFile_));
std::ostringstream ostr;
ostr << message;
if (!attribute.empty())
ostr << " for " << attribute << " attribute";
ostr << " at " << file << ":" << lineNumber;
showWarning(ostr.str());
}
void SourceFileAttributesParser::attributeWarning(
const std::string& message,
size_t lineNumber) {
attributeWarning(message, "", lineNumber);
}
void SourceFileAttributesParser::rcppExportWarning(
const std::string& message,
size_t lineNumber) {
attributeWarning(message, "Rcpp::export", lineNumber);
}
void SourceFileAttributesParser::rcppExportNoFunctionFoundWarning(
size_t lineNumber) {
rcppExportWarning("No function found", lineNumber);
}
void SourceFileAttributesParser::rcppExportInvalidParameterWarning(
const std::string& param,
size_t lineNumber) {
rcppExportWarning("Invalid parameter: "
"'" + param + "'", lineNumber);
}
void SourceFileAttributesParser::rcppInterfacesWarning(
const std::string& message,
size_t lineNumber) {
attributeWarning(message + " (valid interfaces are 'r' and 'cpp')",
"Rcpp::interfaces", lineNumber);
}
// Track /* */ comment state
void CommentState::submitLine(const std::string& line) {
std::size_t pos = 0;
while (pos != std::string::npos) {
// check for a // which would invalidate any other token found
std::size_t lineCommentPos = line.find("//", pos);
// look for the next token
std::string token = inComment() ? "*/" : "/*";
pos = line.find(token, pos);
// process the comment token if found
if (pos != std::string::npos) {
// break if the line comment precedes the comment token
if (lineCommentPos != std::string::npos && lineCommentPos < pos)
break;
inComment_ = !inComment_;
pos += token.size();
}
}
}
} // namespace attributes
} // namespace Rcpp
/*******************************************************************
* AttributesGen.cpp
*******************************************************************/
namespace Rcpp {
namespace attributes {
// constants
namespace {
const char * const kRcppExportsSuffix = "_RcppExports.h";
const char * const kTrySuffix = "_try";
}
ExportsGenerator::ExportsGenerator(const std::string& targetFile,
const std::string& package,
const std::string& commentPrefix)
: targetFile_(targetFile),
package_(package),
commentPrefix_(commentPrefix),
hasCppInterface_(false) {
// read the existing target file if it exists
if (FileInfo(targetFile_).exists()) {
std::ifstream ifs(targetFile_.c_str());
if (ifs.fail())
throw Rcpp::file_io_error(targetFile_);
std::stringstream buffer;
buffer << ifs.rdbuf();
existingCode_ = buffer.str();
}
// see if this is safe to overwite and throw if it isn't
if (!isSafeToOverwrite())
throw Rcpp::file_exists(targetFile_);
}
void ExportsGenerator::writeFunctions(
const SourceFileAttributes& attributes,
bool verbose) {
if (attributes.hasInterface(kInterfaceCpp))
hasCppInterface_ = true;
doWriteFunctions(attributes, verbose);
}
// Commit the stream -- is a no-op if the existing code is identical
// to the generated code. Returns true if data was written and false
// if it wasn't (throws exception on io error)
bool ExportsGenerator::commit(const std::string& preamble) {
// get the generated code
std::string code = codeStream_.str();
// if there is no generated code AND the exports file does not
// currently exist then do nothing
if (code.empty() && !FileInfo(targetFile_).exists())
return false;
// write header/preamble
std::ostringstream headerStream;
headerStream << commentPrefix_ << " This file was generated by "
<< "Rcpp::compileAttributes" << std::endl;
headerStream << commentPrefix_ << " Generator token: "
<< generatorToken() << std::endl << std::endl;
if (!preamble.empty())
headerStream << preamble;
// get generated code and only write it if there was a change
std::string generatedCode = headerStream.str() + code;
if (generatedCode != existingCode_) {
// open the file
std::ofstream ofs(targetFile_.c_str(),
std::ofstream::out | std::ofstream::trunc);
if (ofs.fail())
throw Rcpp::file_io_error(targetFile_);
// write generated code and return
ofs << generatedCode;
ofs.close();
return true;
}
else {
return false;
}
}
// Remove the generated file entirely
bool ExportsGenerator::remove() {
return removeFile(targetFile_);
}
CppExportsGenerator::CppExportsGenerator(const std::string& packageDir,
const std::string& package,
const std::string& fileSep)
: ExportsGenerator(
packageDir + fileSep + "src" + fileSep + "RcppExports.cpp",
package,
"//")
{
}
void CppExportsGenerator::doWriteFunctions(
const SourceFileAttributes& attributes,
bool verbose) {
// generate functions
generateCpp(ostr(),
attributes,
true,
attributes.hasInterface(kInterfaceCpp),
package());
// track cppExports and signatures (we use these at the end to
// generate the ValidateSignature and RegisterCCallable functions)
if (attributes.hasInterface(kInterfaceCpp)) {
for (SourceFileAttributes::const_iterator
it = attributes.begin(); it != attributes.end(); ++it) {
if (it->isExportedFunction()) {
// add it to the list if it's not hidden
Function fun = it->function().renamedTo(it->exportedName());
if (!fun.isHidden())
cppExports_.push_back(*it);
}
}
}
// verbose if requested
if (verbose) {
Rcpp::Rcout << "Exports from " << attributes.sourceFile() << ":"
<< std::endl;
for (std::vector<Attribute>::const_iterator
it = attributes.begin(); it != attributes.end(); ++it) {
if (it->isExportedFunction())
Rcpp::Rcout << " " << it->function() << std::endl;
}
Rcpp::Rcout << std::endl;
}
}
void CppExportsGenerator::writeEnd()
{
// generate a function that can be used to validate exported
// functions and their signatures prior to looking up with
// GetCppCallable (otherwise inconsistent signatures between
// client and library would cause a crash)
if (hasCppInterface()) {
ostr() << std::endl;
ostr() << "// validate"
<< " (ensure exported C++ functions exist before "
<< "calling them)" << std::endl;
ostr() << "static int " << exportValidationFunctionRegisteredName()
<< "(const char* sig) { " << std::endl;
ostr() << " static std::set<std::string> signatures;"
<< std::endl;
ostr() << " if (signatures.empty()) {" << std::endl;
for (std::size_t i=0;i<cppExports_.size(); i++) {
const Attribute& attr = cppExports_[i];
ostr() << " signatures.insert(\""
<< attr.function().signature(attr.exportedName())
<< "\");" << std::endl;
}
ostr() << " }" << std::endl;
ostr() << " return signatures.find(sig) != signatures.end();"
<< std::endl;
ostr() << "}" << std::endl;
// generate a function that will register all of our C++
// exports as C-callable from other packages
ostr() << std::endl;
ostr() << "// registerCCallable (register entry points for "
"exported C++ functions)" << std::endl;
ostr() << "RcppExport SEXP " << registerCCallableExportedName()
<< "() { " << std::endl;
for (std::size_t i=0;i<cppExports_.size(); i++) {
const Attribute& attr = cppExports_[i];
std::string name = package() + "_" + attr.exportedName();
ostr() << registerCCallable(
4,
attr.exportedName(),
attr.function().name() + kTrySuffix);
ostr() << std::endl;
}
ostr() << registerCCallable(4,
exportValidationFunction(),
exportValidationFunction());
ostr() << std::endl;
ostr() << " return R_NilValue;" << std::endl;
ostr() << "}" << std::endl;
}
}
std::string CppExportsGenerator::registerCCallable(
size_t indent,
const std::string& exportedName,
const std::string& name) const {
std::ostringstream ostr;
std::string indentStr(indent, ' ');
ostr << indentStr << "R_RegisterCCallable(\"" << package() << "\", "
<< "\"" << package() << "_" << exportedName << "\", "
<< "(DL_FUNC)" << package() << "_" << name << ");";
return ostr.str();
}
bool CppExportsGenerator::commit(const std::vector<std::string>& includes) {
// includes
std::ostringstream ostr;
if (!includes.empty()) {
for (std::size_t i=0;i<includes.size(); i++)
ostr << includes[i] << std::endl;
}
if (hasCppInterface()) {
ostr << "#include <string>" << std::endl;
ostr << "#include <set>" << std::endl;
}
ostr << std::endl;
// always bring in Rcpp
ostr << "using namespace Rcpp;" << std::endl << std::endl;
// commit with preamble
return ExportsGenerator::commit(ostr.str());
}
CppExportsIncludeGenerator::CppExportsIncludeGenerator(
const std::string& packageDir,
const std::string& package,
const std::string& fileSep)
: ExportsGenerator(
packageDir + fileSep + "inst" + fileSep + "include" +
fileSep + package + kRcppExportsSuffix,
package,
"//")
{
includeDir_ = packageDir + fileSep + "inst" + fileSep + "include";
}
void CppExportsIncludeGenerator::writeBegin() {
ostr() << "namespace " << package() << " {"
<< std::endl << std::endl;
// Import Rcpp into this namespace. This allows declarations to
// be written without fully qualifying all Rcpp types. The only
// negative side-effect is that when this package's namespace
// is imported it will also pull in Rcpp. However since this is
// opt-in and represents a general desire to do namespace aliasing
// this seems okay
ostr() << " using namespace Rcpp;" << std::endl << std::endl;
// Write our export validation helper function. Putting it in
// an anonymous namespace will hide it from callers and give
// it per-translation unit linkage
ostr() << " namespace {" << std::endl;
ostr() << " void validateSignature(const char* sig) {"
<< std::endl;
ostr() << " Rcpp::Function require = "
<< "Rcpp::Environment::base_env()[\"require\"];"
<< std::endl;
ostr() << " require(\"" << package() << "\", "
<< "Rcpp::Named(\"quietly\") = true);"
<< std::endl;
std::string validate = "validate";
std::string fnType = "Ptr_" + validate;
ostr() << " typedef int(*" << fnType << ")(const char*);"
<< std::endl;
std::string ptrName = "p_" + validate;
ostr() << " static " << fnType << " " << ptrName << " = "
<< "(" << fnType << ")" << std::endl
<< " "
<< getCCallable(exportValidationFunctionRegisteredName())
<< ";" << std::endl;
ostr() << " if (!" << ptrName << "(sig)) {" << std::endl;
ostr() << " throw Rcpp::function_not_exported("
<< std::endl
<< " "
<< "\"C++ function with signature '\" + std::string(sig) + \"' not found in " << package()
<< "\");" << std::endl;
ostr() << " }" << std::endl;
ostr() << " }" << std::endl;
ostr() << " }" << std::endl << std::endl;
}
void CppExportsIncludeGenerator::doWriteFunctions(
const SourceFileAttributes& attributes,
bool verbose) {
// don't write anything if there is no C++ interface
if (!attributes.hasInterface(kInterfaceCpp))
return;
for(std::vector<Attribute>::const_iterator
it = attributes.begin(); it != attributes.end(); ++it) {
if (it->isExportedFunction()) {
Function function =
it->function().renamedTo(it->exportedName());
// if it's hidden then don't generate a C++ interface
if (function.isHidden())
continue;
ostr() << " inline " << function << " {"
<< std::endl;
std::string fnType = "Ptr_" + function.name();
ostr() << " typedef SEXP(*" << fnType << ")(";
for (size_t i=0; i<function.arguments().size(); i++) {
ostr() << "SEXP";
if (i != (function.arguments().size()-1))
ostr() << ",";
}
ostr() << ");" << std::endl;
std::string ptrName = "p_" + function.name();
ostr() << " static " << fnType << " "
<< ptrName << " = NULL;"
<< std::endl;
ostr() << " if (" << ptrName << " == NULL) {"
<< std::endl;
ostr() << " validateSignature"
<< "(\"" << function.signature() << "\");"
<< std::endl;
ostr() << " " << ptrName << " = "
<< "(" << fnType << ")"
<< getCCallable(package() + "_" + function.name()) << ";"
<< std::endl;
ostr() << " }" << std::endl;
ostr() << " RNGScope __rngScope;" << std::endl;
ostr() << " RObject __result = " << ptrName << "(";
const std::vector<Argument>& args = function.arguments();
for (std::size_t i = 0; i<args.size(); i++) {
ostr() << "Rcpp::wrap(" << args[i].name() << ")";
if (i != (args.size()-1))
ostr() << ", ";
}
ostr() << ");" << std::endl;
ostr() << " if (__result.inherits(\"try-error\"))"
<< std::endl
<< " throw Rcpp::exception(as<std::string>("
<< "__result).c_str());"
<< std::endl;
ostr() << " return Rcpp::as<" << function.type() << " >"
<< "(__result);" << std::endl;
ostr() << " }" << std::endl << std::endl;
}
}
}
void CppExportsIncludeGenerator::writeEnd() {
ostr() << "}" << std::endl;
ostr() << std::endl;
ostr() << "#endif // " << getHeaderGuard() << std::endl;
}
bool CppExportsIncludeGenerator::commit(
const std::vector<std::string>& includes) {
if (hasCppInterface()) {
// create the include dir if necessary
createDirectory(includeDir_);
// generate preamble
std::ostringstream ostr;
// header guard
std::string guard = getHeaderGuard();
ostr << "#ifndef " << guard << std::endl;
ostr << "#define " << guard << std::endl << std::endl;
// includes
if (!includes.empty()) {
for (std::size_t i=0;i<includes.size(); i++)
ostr << includes[i] << std::endl;
ostr << std::endl;
}
// commit with preamble
return ExportsGenerator::commit(ostr.str());
}
else {
return ExportsGenerator::remove();
}
}
std::string CppExportsIncludeGenerator::getCCallable(
const std::string& function) const {
std::ostringstream ostr;
ostr << "R_GetCCallable"
<< "(\"" << package() << "\", "
<< "\"" << function << "\")";
return ostr.str();
}
std::string CppExportsIncludeGenerator::getHeaderGuard() const {
return "__" + package() + "_RcppExports_h__";
}
CppPackageIncludeGenerator::CppPackageIncludeGenerator(
const std::string& packageDir,
const std::string& package,
const std::string& fileSep)
: ExportsGenerator(
packageDir + fileSep + "inst" + fileSep + "include" +
fileSep + package + ".h",
package,
"//")
{
includeDir_ = packageDir + fileSep + "inst" + fileSep + "include";
}
void CppPackageIncludeGenerator::writeEnd() {
if (hasCppInterface()) {
// header guard
std::string guard = getHeaderGuard();
ostr() << "#ifndef " << guard << std::endl;
ostr() << "#define " << guard << std::endl << std::endl;
ostr() << "#include \"" << package() << kRcppExportsSuffix
<< "\"" << std::endl;
ostr() << std::endl;
ostr() << "#endif // " << getHeaderGuard() << std::endl;
}
}
bool CppPackageIncludeGenerator::commit(
const std::vector<std::string>& includes) {
if (hasCppInterface()) {
// create the include dir if necessary
createDirectory(includeDir_);
// commit
return ExportsGenerator::commit();
}
else {
return ExportsGenerator::remove();
}
}
std::string CppPackageIncludeGenerator::getHeaderGuard() const {
return "__" + package() + "_h__";
}
RExportsGenerator::RExportsGenerator(const std::string& packageDir,
const std::string& package,
const std::string& fileSep)
: ExportsGenerator(
packageDir + fileSep + "R" + fileSep + "RcppExports.R",
package,
"#")
{
}
void RExportsGenerator::doWriteFunctions(
const SourceFileAttributes& attributes,
bool verbose) {
// write standalone roxygen chunks
const std::vector<std::vector<std::string> >& roxygenChunks =
attributes.roxygenChunks();
for (std::size_t i = 0; i<roxygenChunks.size(); i++) {
const std::vector<std::string>& chunk = roxygenChunks[i];
for (std::size_t l = 0; l < chunk.size(); l++)
ostr() << chunk[l] << std::endl;
ostr() << "NULL" << std::endl << std::endl;
}
// write exported functions
if (attributes.hasInterface(kInterfaceR)) {
// process each attribute
for(std::vector<Attribute>::const_iterator
it = attributes.begin(); it != attributes.end(); ++it) {
// alias the attribute and function (bail if not export)
const Attribute& attribute = *it;
if (!attribute.isExportedFunction())
continue;
const Function& function = attribute.function();
// print roxygen lines
for (size_t i=0; i<attribute.roxygen().size(); i++)
ostr() << attribute.roxygen()[i] << std::endl;
// build the parameter list
std::string args = generateRArgList(function);
// determine the function name
std::string name = attribute.exportedName();
// write the function
ostr() << name << " <- function(" << args << ") {"
<< std::endl;
ostr() << " ";
if (function.type().isVoid())
ostr() << "invisible(";
ostr() << ".Call(";
ostr() << "'" << package() << "_" << function.name() << "', "
<< "PACKAGE = '" << package() << "'";
// add arguments
const std::vector<Argument>& arguments = function.arguments();
for (size_t i = 0; i<arguments.size(); i++)
ostr() << ", " << arguments[i].name();
ostr() << ")";
if (function.type().isVoid())
ostr() << ")";
ostr() << std::endl;
ostr() << "}" << std::endl << std::endl;
}
}
}
void RExportsGenerator::writeEnd() {
if (hasCppInterface()) {
// register all C-callable functions
ostr() << "# Register entry points for exported C++ functions"
<< std::endl;
ostr() << "methods::setLoadAction(function(ns) {" << std::endl;
ostr() << " .Call('" << registerCCallableExportedName()
<< "', PACKAGE = '" << package() << "')"
<< std::endl << "})" << std::endl;
}
}
bool RExportsGenerator::commit(const std::vector<std::string>& includes) {
return ExportsGenerator::commit();
}
ExportsGenerators::~ExportsGenerators() {
try {
for(Itr it = generators_.begin(); it != generators_.end(); ++it)
delete *it;
generators_.clear();
}
catch(...) {}
}
void ExportsGenerators::add(ExportsGenerator* pGenerator) {
generators_.push_back(pGenerator);
}
void ExportsGenerators::writeBegin() {
for(Itr it = generators_.begin(); it != generators_.end(); ++it)
(*it)->writeBegin();
}
void ExportsGenerators::writeFunctions(
const SourceFileAttributes& attributes,
bool verbose) {
for(Itr it = generators_.begin(); it != generators_.end(); ++it)
(*it)->writeFunctions(attributes, verbose);
}
void ExportsGenerators::writeEnd() {
for(Itr it = generators_.begin(); it != generators_.end(); ++it)
(*it)->writeEnd();
}
// Commit and return a list of the files that were updated
std::vector<std::string> ExportsGenerators::commit(
const std::vector<std::string>& includes) {
std::vector<std::string> updated;
for(Itr it = generators_.begin(); it != generators_.end(); ++it) {
if ((*it)->commit(includes))
updated.push_back((*it)->targetFile());
}
return updated;
}
// Remove and return a list of files that were removed
std::vector<std::string> ExportsGenerators::remove() {
std::vector<std::string> removed;
for(Itr it = generators_.begin(); it != generators_.end(); ++it) {
if ((*it)->remove())
removed.push_back((*it)->targetFile());
}
return removed;
}
// Helpers for converting C++ default arguments to R default arguments
namespace {
// convert a C++ numeric argument to an R argument value
// (returns empty string if no conversion is possible)
std::string cppNumericArgToRArg(const std::string& type,
const std::string& cppArg) {
// check for a number
double num;
std::stringstream argStream(cppArg);
if ((argStream >> num)) {
// L suffix means return the value literally
if (!argStream.eof()) {
std::string suffix;
argStream >> suffix;
if (argStream.eof() && suffix == "L")
return cppArg;
}
// no decimal and the type isn't explicitly double or
// float means integer
if (cppArg.find('.') == std::string::npos &&
type != "double" && type != "float")
return cppArg + "L";
// otherwise return arg literally
else
return cppArg;
}
else {
return std::string();
}
}
// convert a C++ ::create style argument value to an R argument
// value (returns empty string if no conversion is possible)
std::string cppCreateArgToRArg(const std::string& cppArg) {
std::string create = "::create";
size_t createLoc = cppArg.find(create);
if (createLoc == std::string::npos ||
((createLoc + create.length()) >= cppArg.size())) {
return std::string();
}
std::string type = cppArg.substr(0, createLoc);
std::string rcppScope = "Rcpp::";
size_t rcppLoc = type.find(rcppScope);
if (rcppLoc == 0 && type.size() > rcppScope.length())
type = type.substr(rcppScope.length());
std::string args = cppArg.substr(createLoc + create.length());
if (type == "CharacterVector")
return "character" + args;
else if (type == "IntegerVector")
return "integer" + args;
else if (type == "NumericVector")
return "numeric" + args;
else
return std::string();
}
// convert a C++ Matrix to an R argument (returns emtpy string
// if no conversion possible)
std::string cppMatrixArgToRArg(const std::string& cppArg) {
// look for Matrix
std::string matrix = "Matrix";
size_t matrixLoc = cppArg.find(matrix);
if (matrixLoc == std::string::npos ||
((matrixLoc + matrix.length()) >= cppArg.size())) {
return std::string();
}
std::string args = cppArg.substr(matrixLoc + matrix.length());
return "matrix" + args;
}
// convert a C++ literal to an R argument (returns emtpy string
// if no conversion possible)
std::string cppLiteralArgToRArg(const std::string& cppArg) {
if (cppArg == "true")
return "TRUE";
else if (cppArg == "false")
return "FALSE";
else if (cppArg == "R_NilValue")
return "NULL";
else if (cppArg == "NA_STRING" || cppArg == "NA_INTEGER" ||
cppArg == "NA_LOGICAL" || cppArg == "NA_REAL") {
return "NA";
}
else
return std::string();
}
// convert a C++ argument value to an R argument value (returns empty
// string if no conversion is possible)
std::string cppArgToRArg(const std::string& type,
const std::string& cppArg) {
// try for quoted string
if (isQuoted(cppArg))
return cppArg;
// try for literal
std::string rArg = cppLiteralArgToRArg(cppArg);
if (!rArg.empty())
return rArg;
// try for a create arg
rArg = cppCreateArgToRArg(cppArg);
if (!rArg.empty())
return rArg;
// try for a matrix arg
rArg = cppMatrixArgToRArg(cppArg);
if (!rArg.empty())
return rArg;
// try for a numeric arg
rArg = cppNumericArgToRArg(type, cppArg);
if (!rArg.empty())
return rArg;
// couldn't parse the arg
return std::string();
}
} // anonymous namespace
// Generate an R argument list for a function
std::string generateRArgList(const Function& function) {
std::ostringstream argsOstr;
const std::vector<Argument>& arguments = function.arguments();
for (size_t i = 0; i<arguments.size(); i++) {
const Argument& argument = arguments[i];
argsOstr << argument.name();
if (!argument.defaultValue().empty()) {
std::string rArg = cppArgToRArg(argument.type().name(),
argument.defaultValue());
if (!rArg.empty()) {
argsOstr << " = " << rArg;
} else {
showWarning("Unable to parse C++ default value '" +
argument.defaultValue() + "' for argument "+
argument.name() + " of function " +
function.name());
}
}
if (i != (arguments.size()-1))
argsOstr << ", ";
}
return argsOstr.str();
}
// Generate the C++ code required to make [[Rcpp::export]] functions
// available as C symbols with SEXP parameters and return
void generateCpp(std::ostream& ostr,
const SourceFileAttributes& attributes,
bool includePrototype,
bool cppInterface,
const std::string& contextId) {
// process each attribute
for(std::vector<Attribute>::const_iterator
it = attributes.begin(); it != attributes.end(); ++it) {
// alias the attribute and function (bail if not export)
const Attribute& attribute = *it;
if (!attribute.isExportedFunction())
continue;
const Function& function = attribute.function();
// include prototype if requested
if (includePrototype) {
ostr << "// " << function.name() << std::endl;
ostr << function << ";";
}
// write the C++ callable SEXP-based function (this version
// returns errors via "try-error")
ostr << std::endl;
ostr << (cppInterface ? "static" : "RcppExport");
ostr << " SEXP ";
std::string funcName = contextId + "_" + function.name();
ostr << funcName;
if (cppInterface)
ostr << kTrySuffix;
ostr << "(";
std::ostringstream ostrArgs;
const std::vector<Argument>& arguments = function.arguments();
for (size_t i = 0; i<arguments.size(); i++) {
const Argument& argument = arguments[i];
ostrArgs << "SEXP " << argument.name() << "SEXP";
if (i != (arguments.size()-1))
ostrArgs << ", ";
}
std::string args = ostrArgs.str();
ostr << args << ") {" << std::endl;
ostr << "BEGIN_RCPP" << std::endl;
if (!cppInterface)
ostr << " Rcpp::RNGScope __rngScope;" << std::endl;
for (size_t i = 0; i<arguments.size(); i++) {
const Argument& argument = arguments[i];
// Rcpp::as to c++ type
ostr << " " << argument.type().name() << " " << argument.name()
<< " = " << "Rcpp::as<" << argument.type().name() << " >("
<< argument.name() << "SEXP);" << std::endl;
}
ostr << " ";
if (!function.type().isVoid())
ostr << function.type() << " __result = ";
ostr << function.name() << "(";
for (size_t i = 0; i<arguments.size(); i++) {
const Argument& argument = arguments[i];
ostr << argument.name();
if (i != (arguments.size()-1))
ostr << ", ";
}
ostr << ");" << std::endl;
std::string res = function.type().isVoid() ? "R_NilValue" :
"Rcpp::wrap(__result)";
ostr << " return " << res << ";" << std::endl;
ostr << (cppInterface ? "END_RCPP_RETURN_ERROR" : "END_RCPP")
<< std::endl;
ostr << "}" << std::endl;
// Now write an R wrapper that returns error via Rf_error
if (cppInterface) {
ostr << "RcppExport SEXP " << funcName << "(" << args << ") {"
<< std::endl;
ostr << " Rcpp::RNGScope __rngScope;" << std::endl;
ostr << " SEXP __result = PROTECT(" << funcName
<< kTrySuffix << "(";
for (size_t i = 0; i<arguments.size(); i++) {
const Argument& argument = arguments[i];
ostr << argument.name() << "SEXP";
if (i != (arguments.size()-1))
ostr << ", ";
}
ostr << "));" << std::endl;
ostr << " "
<< "Rboolean __isError = Rf_inherits(__result, \"try-error\");"
<< std::endl;
ostr << " UNPROTECT(1);" << std::endl
<< " if (__isError)" << std::endl
<< " Rf_error(CHAR(Rf_asChar(__result)));" << std::endl
<< " return __result;" << std::endl
<< "}" << std::endl;
}
}
}
} // namespace attributes
} // namespace Rcpp
// provide implementations for util
namespace Rcpp {
namespace attributes {
// Utility class for getting file existence and last modified time
FileInfo::FileInfo(const std::string& path)
: path_(path), exists_(false), lastModified_(0)
{
#ifdef _WIN32
struct _stat buffer;
int result = _stat(path.c_str(), &buffer);
#else
struct stat buffer;
int result = stat(path.c_str(), &buffer);
#endif
if (result != 0) {
if (errno == ENOENT)
exists_ = false;
else
throw Rcpp::file_io_error(errno, path);
} else {
exists_ = true;
lastModified_ = buffer.st_mtime;
}
}
// Remove a file (call back into R for this)
bool removeFile(const std::string& path) {
if (FileInfo(path).exists()) {
Rcpp::Function rm = Rcpp::Environment::base_env()["file.remove"];
rm(path);
return true;
}
else {
return false;
}
}
// Recursively create a directory (call back into R for this)
void createDirectory(const std::string& path) {
if (!FileInfo(path).exists()) {
Rcpp::Function mkdir = Rcpp::Environment::base_env()["dir.create"];
mkdir(path, Rcpp::Named("recursive") = true);
}
}
// Known whitespace chars
const char * const kWhitespaceChars = " \f\n\r\t\v";
// Query whether a character is whitespace
bool isWhitespace(char ch) {
return std::strchr(kWhitespaceChars, ch) != NULL;
}
// Trim a string
void trimWhitespace(std::string* pStr) {
// skip empty case
if (pStr->empty())
return;
// trim right
std::string::size_type pos = pStr->find_last_not_of(kWhitespaceChars);
if (pos != std::string::npos)
pStr->erase(pos + 1);
// trim left
pos = pStr->find_first_not_of(kWhitespaceChars);
pStr->erase(0, pos);
}
// Strip balanced quotes from around a string (assumes already trimmed)
void stripQuotes(std::string* pStr) {
if (pStr->length() < 2)
return;
char quote = *(pStr->begin());
if ( (quote == '\'' || quote == '\"') && (*(pStr->rbegin()) == quote) )
*pStr = pStr->substr(1, pStr->length()-2);
}
// is the passed string quoted?
bool isQuoted(const std::string& str) {
if (str.length() < 2)
return false;
char quote = *(str.begin());
return (quote == '\'' || quote == '\"') && (*(str.rbegin()) == quote);
}
// show a warning message
void showWarning(const std::string& msg) {
Rcpp::Function warning = Rcpp::Environment::base_env()["warning"];
warning(msg, Rcpp::Named("call.") = false);
}
} // namespace attributes
} // namespace Rcpp
/*******************************************************************
* Attributes.cpp
*******************************************************************/
using namespace Rcpp::attributes;
// Implementation helpers for sourceCppContext
namespace {
// Class that manages generation of source code for the sourceCpp dynlib
class SourceCppDynlib {
public:
SourceCppDynlib() {}
SourceCppDynlib(const std::string& cppSourcePath, Rcpp::List platform)
: cppSourcePath_(cppSourcePath)
{
// get cpp source file info
FileInfo cppSourceFilenameInfo(cppSourcePath_);
if (!cppSourceFilenameInfo.exists())
throw Rcpp::file_not_found(cppSourcePath_);
// record the base name of the source file
Rcpp::Function basename = Rcpp::Environment::base_env()["basename"];
cppSourceFilename_ = Rcpp::as<std::string>(basename(cppSourcePath_));
// get platform info
fileSep_ = Rcpp::as<std::string>(platform["file.sep"]);
dynlibExt_ = Rcpp::as<std::string>(platform["dynlib.ext"]);
// generate temp directory
Rcpp::Function tempfile = Rcpp::Environment::base_env()["tempfile"];
buildDirectory_ = Rcpp::as<std::string>(tempfile("sourcecpp_"));
std::replace(buildDirectory_.begin(), buildDirectory_.end(), '\\', '/');
Rcpp::Function dircreate = Rcpp::Environment::base_env()["dir.create"];
dircreate(buildDirectory_);
// generate a random context id
contextId_ = "sourceCpp_" + createRandomizer();
// regenerate the source code
regenerateSource();
}
bool isEmpty() const { return cppSourcePath_.empty(); }
bool isBuilt() const { return FileInfo(dynlibPath()).exists(); };
bool isSourceDirty() const {
// source file out of date means we're dirty
if (FileInfo(cppSourcePath_).lastModified() >
FileInfo(generatedCppSourcePath()).lastModified())
return true;
// no dynlib means we're dirty
if (!FileInfo(dynlibPath()).exists())
return true;
// not dirty
return false;
}
void regenerateSource() {
// create new dynlib filename
previousDynlibFilename_ = dynlibFilename_;
dynlibFilename_ = "sourceCpp_" + createRandomizer() + dynlibExt_;
// copy the source file to the build dir
Rcpp::Function filecopy = Rcpp::Environment::base_env()["file.copy"];
filecopy(cppSourcePath_, generatedCppSourcePath(), true);
// parse attributes
SourceFileAttributesParser sourceAttributes(cppSourcePath_);
// generate cpp for attributes and append them
std::ostringstream ostr;
// always include Rcpp.h in case the user didn't
ostr << std::endl << std::endl;
ostr << "#include <Rcpp.h>" << std::endl;
generateCpp(ostr, sourceAttributes, false, false, contextId_);
generatedCpp_ = ostr.str();
std::ofstream cppOfs(generatedCppSourcePath().c_str(),
std::ofstream::out | std::ofstream::app);
if (cppOfs.fail())
throw Rcpp::file_io_error(generatedCppSourcePath());
cppOfs << generatedCpp_;
cppOfs.close();
// generate R for attributes and write it into the build directory
std::ofstream rOfs(generatedRSourcePath().c_str(),
std::ofstream::out | std::ofstream::trunc);
if (rOfs.fail())
throw Rcpp::file_io_error(generatedRSourcePath());
// DLLInfo - hide using . and ensure uniqueness using contextId
std::string dllInfo = "`." + contextId_ + "_DLLInfo`";
rOfs << dllInfo << " <- dyn.load('" << dynlibPath() << "')"
<< std::endl << std::endl;
// Generate R functions
generateR(rOfs, sourceAttributes, dllInfo);
// remove the DLLInfo
rOfs << std::endl << "rm(" << dllInfo << ")"
<< std::endl;
rOfs.close();
// discover exported functions and dependencies
exportedFunctions_.clear();
depends_.clear();
plugins_.clear();
for (SourceFileAttributesParser::const_iterator
it = sourceAttributes.begin(); it != sourceAttributes.end(); ++it) {
if (it->name() == kExportAttribute && !it->function().empty())
exportedFunctions_.push_back(it->exportedName());
else if (it->name() == kDependsAttribute) {
for (size_t i = 0; i<it->params().size(); ++i)
depends_.push_back(it->params()[i].name());
}
else if (it->name() == kPluginsAttribute) {
for (size_t i = 0; i<it->params().size(); ++i)
plugins_.push_back(it->params()[i].name());
}
}
// capture modules
modules_ = sourceAttributes.modules();
// capture embededded R
embeddedR_ = sourceAttributes.embeddedR();
}
const std::string& contextId() const {
return contextId_;
}
const std::string& cppSourcePath() const {
return cppSourcePath_;
}
std::string buildDirectory() const {
return buildDirectory_;
}
std::string generatedCpp() const {
return generatedCpp_;
}
std::string cppSourceFilename() const {
return cppSourceFilename_;
}
std::string rSourceFilename() const {
return cppSourceFilename() + ".R";
}
std::string dynlibFilename() const {
return dynlibFilename_;
}
std::string dynlibPath() const {
return buildDirectory_ + fileSep_ + dynlibFilename();
}
std::string previousDynlibPath() const {
if (!previousDynlibFilename_.empty())
return buildDirectory_ + fileSep_ + previousDynlibFilename_;
else
return std::string();
}
const std::vector<std::string>& exportedFunctions() const {
return exportedFunctions_;
}
const std::vector<std::string>& modules() const {
return modules_;
}
const std::vector<std::string>& depends() const { return depends_; };
const std::vector<std::string>& plugins() const { return plugins_; };
const std::vector<std::string>& embeddedR() const { return embeddedR_; }
private:
std::string generatedCppSourcePath() const {
return buildDirectory_ + fileSep_ + cppSourceFilename();
}
std::string generatedRSourcePath() const {
return buildDirectory_ + fileSep_ + rSourceFilename();
}
void generateR(std::ostream& ostr,
const SourceFileAttributes& attributes,
const std::string& dllInfo) const
{
// process each attribute
for(std::vector<Attribute>::const_iterator
it = attributes.begin(); it != attributes.end(); ++it) {
// alias the attribute and function (bail if not export)
const Attribute& attribute = *it;
if (!attribute.isExportedFunction())
continue;
const Function& function = attribute.function();
// export the function
ostr << attribute.exportedName()
<< " <- Rcpp:::sourceCppFunction("
<< "function(" << generateRArgList(function) << ") {}, "
<< (function.type().isVoid() ? "TRUE" : "FALSE") << ", "
<< dllInfo << ", "
<< "'" << contextId_ + "_" + function.name()
<< "')" << std::endl;
}
// modules
std::vector<std::string> modules = attributes.modules();
if (modules.size() > 0)
{
// modules require definition of C++Object to be loaded
ostr << "library(Rcpp)" << std::endl;
// load each module
for (std::vector<std::string>::const_iterator
it = modules.begin(); it != modules.end(); ++it)
{
ostr << *it << " <- Rcpp::Module(\"" << *it << "\","
<< dllInfo << ")" << std::endl;
}
}
}
std::string createRandomizer() {
Rcpp::Function sample = Rcpp::Environment::base_env()["sample"];
std::ostringstream ostr;
ostr << Rcpp::as<int>(sample(100000, 1));
return ostr.str();
}
private:
std::string cppSourcePath_;
std::string generatedCpp_;
std::string cppSourceFilename_;
std::string contextId_;
std::string buildDirectory_;
std::string fileSep_;
std::string dynlibFilename_;
std::string previousDynlibFilename_;
std::string dynlibExt_;
std::vector<std::string> exportedFunctions_;
std::vector<std::string> modules_;
std::vector<std::string> depends_;
std::vector<std::string> plugins_;
std::vector<std::string> embeddedR_;
};
// Dynlib cache that allows lookup by either file path or code contents
class SourceCppDynlibCache {
public:
SourceCppDynlibCache() {}
private:
// prohibit copying
SourceCppDynlibCache(const SourceCppDynlibCache&);
SourceCppDynlibCache& operator=(const SourceCppDynlibCache&);
public:
// Insert into cache by file name
SourceCppDynlib* insertFile(const std::string& file,
const SourceCppDynlib& dynlib) {
Entry entry;
entry.file = file;
entry.dynlib = dynlib;
entries_.push_back(entry);
return &(entries_.rbegin()->dynlib);
}
// Insert into cache by code
SourceCppDynlib* insertCode(const std::string& code,
const SourceCppDynlib& dynlib) {
Entry entry;
entry.code = code;
entry.dynlib = dynlib;
entries_.push_back(entry);
return &(entries_.rbegin()->dynlib);
}
// Lookup by file
SourceCppDynlib* lookupByFile(const std::string& file) {
for (std::size_t i = 0; i < entries_.size(); i++) {
if (entries_[i].file == file)
return &(entries_[i].dynlib);
}
return NULL;
}
// Lookup by code
SourceCppDynlib* lookupByCode(const std::string& code) {
for (std::size_t i = 0; i < entries_.size(); i++) {
if (entries_[i].code == code)
return &(entries_[i].dynlib);
}
return NULL;
}
private:
struct Entry {
std::string file;
std::string code;
SourceCppDynlib dynlib;
};
std::vector<Entry> entries_;
};
} // anonymous namespace
// Create temporary build directory, generate code as necessary, and return
// the context required for the sourceCpp function to complete it's work
RcppExport SEXP sourceCppContext(SEXP sFile, SEXP sCode,
SEXP sRebuild, SEXP sPlatform) {
BEGIN_RCPP
// parameters
std::string file = Rcpp::as<std::string>(sFile);
std::string code = sCode != R_NilValue ? Rcpp::as<std::string>(sCode) : "";
bool rebuild = Rcpp::as<bool>(sRebuild);
Rcpp::List platform = Rcpp::as<Rcpp::List>(sPlatform);
// get dynlib (using cache if possible)
static SourceCppDynlibCache s_dynlibCache;
SourceCppDynlib* pDynlib = !code.empty() ? s_dynlibCache.lookupByCode(code)
: s_dynlibCache.lookupByFile(file);
// check dynlib build state
bool buildRequired = false;
// if there is no dynlib in the cache then create one
if (pDynlib == NULL) {
buildRequired = true;
SourceCppDynlib newDynlib(file, platform);
if (!code.empty())
pDynlib = s_dynlibCache.insertCode(code, newDynlib);
else
pDynlib = s_dynlibCache.insertFile(file, newDynlib);
}
// if the cached dynlib is dirty then regenerate the source
else if (rebuild || pDynlib->isSourceDirty()) {
buildRequired = true;
pDynlib->regenerateSource();
}
// if the dynlib hasn't yet been built then note that
else if (!pDynlib->isBuilt()) {
buildRequired = true;
}
// return context as a list
using namespace Rcpp;
return List::create(
_["contextId"] = pDynlib->contextId(),
_["cppSourcePath"] = pDynlib->cppSourcePath(),
_["buildRequired"] = buildRequired,
_["buildDirectory"] = pDynlib->buildDirectory(),
_["generatedCpp"] = pDynlib->generatedCpp(),
_["exportedFunctions"] = pDynlib->exportedFunctions(),
_["modules"] = pDynlib->modules(),
_["cppSourceFilename"] = pDynlib->cppSourceFilename(),
_["rSourceFilename"] = pDynlib->rSourceFilename(),
_["dynlibFilename"] = pDynlib->dynlibFilename(),
_["dynlibPath"] = pDynlib->dynlibPath(),
_["previousDynlibPath"] = pDynlib->previousDynlibPath(),
_["depends"] = pDynlib->depends(),
_["plugins"] = pDynlib->plugins(),
_["embeddedR"] = pDynlib->embeddedR());
END_RCPP
}
// Compile the attributes within the specified package directory into
// RcppExports.cpp and RcppExports.R
RcppExport SEXP compileAttributes(SEXP sPackageDir,
SEXP sPackageName,
SEXP sDepends,
SEXP sCppFiles,
SEXP sCppFileBasenames,
SEXP sIncludes,
SEXP sVerbose,
SEXP sPlatform) {
BEGIN_RCPP
// arguments
std::string packageDir = Rcpp::as<std::string>(sPackageDir);
std::string packageName = Rcpp::as<std::string>(sPackageName);
Rcpp::CharacterVector vDepends = Rcpp::as<Rcpp::CharacterVector>(sDepends);
std::set<std::string> depends;
for (Rcpp::CharacterVector::iterator
it = vDepends.begin(); it != vDepends.end(); ++it) {
depends.insert(std::string(*it));
}
std::vector<std::string> cppFiles =
Rcpp::as<std::vector<std::string> >(sCppFiles);
std::vector<std::string> cppFileBasenames =
Rcpp::as<std::vector<std::string> >(sCppFileBasenames);
std::vector<std::string> includes =
Rcpp::as<std::vector<std::string> >(sIncludes);
bool verbose = Rcpp::as<bool>(sVerbose);
Rcpp::List platform = Rcpp::as<Rcpp::List>(sPlatform);
std::string fileSep = Rcpp::as<std::string>(platform["file.sep"]);
// initialize generators
ExportsGenerators generators;
generators.add(new CppExportsGenerator(packageDir, packageName, fileSep));
generators.add(new RExportsGenerator(packageDir, packageName, fileSep));
// catch file exists exception if the include file already exists
// and we are unable to overwrite it
try {
generators.add(new CppExportsIncludeGenerator(packageDir,
packageName,
fileSep));
}
catch(const Rcpp::file_exists& e) {
std::string msg =
"The header file '" + e.filePath() + "' already exists so "
"cannot be overwritten by Rcpp::interfaces";
throw Rcpp::exception(msg.c_str(), __FILE__, __LINE__);
}
// catch file exists exception for package include (because if it
// already exists we simply leave it alone)
try {
generators.add(new CppPackageIncludeGenerator(packageDir,
packageName,
fileSep));
}
catch(const Rcpp::file_exists& e) {}
// write begin
generators.writeBegin();
// Parse attributes from each file and generate code as required.
bool haveAttributes = false;
std::set<std::string> dependsAttribs;
for (std::size_t i=0; i<cppFiles.size(); i++) {
// parse file (continue if there is no generator output)
std::string cppFile = cppFiles[i];
SourceFileAttributesParser attributes(cppFile);
if (!attributes.hasGeneratorOutput())
continue;
// confirm we have attributes
haveAttributes = true;
// write functions
generators.writeFunctions(attributes, verbose);
// track depends
for (SourceFileAttributesParser::const_iterator
it = attributes.begin(); it != attributes.end(); ++it) {
if (it->name() == kDependsAttribute) {
for (size_t i = 0; i<it->params().size(); ++i)
dependsAttribs.insert(it->params()[i].name());
}
}
}
// write end
generators.writeEnd();
// commit or remove
std::vector<std::string> updated;
if (haveAttributes)
updated = generators.commit(includes);
else
updated = generators.remove();
// print warning if there are depends attributes that don't have
// corresponding entries in the DESCRIPTION file
std::vector<std::string> diff;
std::set_difference(dependsAttribs.begin(), dependsAttribs.end(),
depends.begin(), depends.end(),
std::back_inserter(diff));
if (!diff.empty()) {
std::string msg =
"The following packages are referenced using Rcpp::depends "
"attributes however are not listed in the Depends and LinkingTo "
"fields of the package DESCRIPTION file: ";
for (size_t i=0; i<diff.size(); i++) {
msg += diff[i];
if (i != (diff.size()-1))
msg += ", ";
}
showWarning(msg);
}
// verbose output
if (verbose) {
for (size_t i=0; i<updated.size(); i++)
Rcpp::Rcout << updated[i] << " updated." << std::endl;
}
// return files updated
return Rcpp::wrap<std::vector<std::string> >(updated);
END_RCPP
}
