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// this file is part of VecGeom
// a service that generates a cpp function/file which instantiates a given list of
// specialized navigators with the purpose to link them into a shared library
// the service also generates a CMakeLists.txt file to facilitate this process
// started 27.2.2016; sandro.wenzel@cern.ch
#include <sstream>
#include <iostream>
#include <fstream>
#include <vector>
void GenerateHeaderIncludes(std::ostream &ss, std::vector<std::string> const &navigatornames)
{
// include base stuff
ss << "#include \"management/GeoManager.h\"\n";
ss << "#include \"volumes/LogicalVolume.h\"\n";
// include specific navigator headers ( must exist of course )
for (auto &n : navigatornames) {
ss << "#include \"" << n << ".h\"\n";
}
}
void GenerateNavigatorInstantiationFunction(std::ostream &ss, std::vector<std::string> const &volumenames,
std::vector<std::string> const &navigatornames)
{
ss << "void InitSpecializedNavigators(){\n"; // start function
ss << "std::cerr << \"---- SpecializedNavigator Initializer Called ---- \\n \";\n";
ss << "int counter=0;\n";
ss << "for( auto & lvol : vecgeom::GeoManager::Instance().GetLogicalVolumesMap() ){\n";
int counter = 0;
for (auto &n : volumenames) {
ss << " if(std::strcmp(lvol.second->GetName(),\"" << n << "\") == 0){\n";
ss << " lvol.second->SetNavigator(vecgeom::" << navigatornames[counter] << "::Instance());\n";
ss << " std::cerr << \"---- assigning specialized navigator \" "
<< "\"" << navigatornames[counter] << "\""
<< "\"\\n\"; \n";
ss << " counter++;\n";
ss << "}\n"; // end if
counter++;
}
ss << "}\n"; // end loop
ss << "std::cerr << \"overwrote \" << counter << \" navigators \\n\";\n";
ss << "std::cerr << \"---- SpecializedNavigator Initializer Call Ends ---- \\n \";\n";
ss << "}\n"; // end function
}
// to generate the CMakeFile in order to compile and link this
void GenerateCMakeFile(std::ostream &ss)
{
ss << "cmake_minimum_required(VERSION 3.1.0)\n";
ss << "find_package(VecGeom REQUIRED)\n";
ss << "#it is allowed to set the compiler before project and language specification\n";
ss << "set(CMAKE_C_COMPILER ${VECGEOM_C_COMPILER})\n";
ss << "set(CMAKE_CXX_COMPILER ${VECGEOM_CXX_COMPILER})\n";
ss << "project(navigatorlib)\n";
ss << "enable_language(CXX)\n";
ss << "set(CMAKE_CXX_STANDARD 17 CACHE STRING \"C++ ISO Standard\")\n";
ss << "set(CMAKE_CXX_STANDARD_REQUIRED True)\n";
ss << "if (NOT CMAKE_BUILD_TYPE)\n";
ss << " message(STATUS \"No build type selected, default to Release\")\n";
ss << " set(CMAKE_BUILD_TYPE \"Release\")\n";
ss << "endif()\n";
ss << "include_directories(${VECGEOM_INCLUDE_DIR})\n";
ss << "# include stuff that was included by VecGeom during build\n";
ss << "include_directories(${VECGEOM_EXTERNAL_INCLUDES})\n";
ss << "message(STATUS \"COMPILING WITH ${CMAKE_CXX_FLAGS}\")\n";
ss << "if(APPLE)\n";
ss << " # postpone final symbol resolution to plugin load-time (allow unresolved symbols now)\n";
ss << " # a measure that needs to be done on APPLE only\n";
ss << " set (CMAKE_MODULE_LINKER_FLAGS \"-Wl,-flat_namespace -Wl,-undefined,warning\")\n";
ss << "endif()\n";
ss << "add_library(GeneratedNavigators MODULE navigatorlib.cpp)\n";
}
int main(int argc, char *argv[])
{
if (argc < 2) {
std::cerr << "usage : " << argv[0] << " LVolumeName [LVolumeName ...] \n";
return 1;
}
std::vector<std::string> volumenames;
std::vector<std::string> navigatornames;
for (int i = 1; i < argc; ++i) {
volumenames.push_back(argv[i]);
navigatornames.push_back(std::string(argv[i]) + std::string("Navigator"));
}
std::ofstream cppoutputfile;
cppoutputfile.open("navigatorlib.cpp");
GenerateHeaderIncludes(cppoutputfile, navigatornames);
GenerateNavigatorInstantiationFunction(cppoutputfile, volumenames, navigatornames);
cppoutputfile.close();
std::ofstream cmakeoutputfile;
cmakeoutputfile.open("CMakeLists.txt");
GenerateCMakeFile(cmakeoutputfile);
cmakeoutputfile.close();
return 0;
}
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