GenerateOpalSimulation.h

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//
// Class GenerateOpalSimulation
//   Generates an OPAL input file from data and template file.
//
//   When running the optimizer with the OPAL forward solvers this utility
//   class helps generating OPAL input files corresponding to the design
//   variable values of the requested evaluation.
//   Using the data file we start by generating the dictionary of known
//   templates.
//   When the input file is requested, all template variables in the template
//   input file are replaced with values found in the dictionary.
//
//   TODO:
//     - pass stream directly to opal (detour over file not necessary)
//
// Copyright (c) 2010 - 2013, Yves Ineichen, ETH Zürich
// All rights reserved
//
// Implemented as part of the PhD thesis
// "Toward massively parallel multi-objective optimization with application to
// particle accelerators" (https://doi.org/10.3929/ethz-a-009792359)
//
// This file is part of OPAL.
//
// OPAL 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 3 of the License, or
// (at your option) any later version.
//
// You should have received a copy of the GNU General Public License
// along with OPAL. If not, see <https://www.gnu.org/licenses/>.
//
#ifndef __GENERATE_SIMULATION_H__
#define __GENERATE_SIMULATION_H__
 
#include <iostream>
#include <filesystem>
#include <fstream>
#include <sstream>
#include <string>
#include <map>
#include <cstdlib>
 
#include <vector>
#include <boost/algorithm/string.hpp>
 
#include "Util/OptPilotException.h"
 
class GenerateOpalSimulation {
 
public:

    GenerateOpalSimulation(std::string tmplFile, std::string varDictionary,
                           std::map<std::string,std::string> userValues) {
        varDictionary_ = varDictionary;
        tmplFile_ = tmplFile;
 
        // some variables need to be scaled
        scaleVars_.insert(std::pair<std::string, double>("GUNSOLB", 1.));
 
        // add user values and then fill using the data file without
        // overwriting user values..
        dictionary_.insert(userValues.begin(),userValues.end());
        fillDictionary();
    }
 
    ~GenerateOpalSimulation() {
        dictionary_.clear();
        scaleVars_.clear();
    }

    void writeInputFile(std::string outputFile) {
 
        std::ifstream infile(tmplFile_.c_str());
        std::ostringstream outdata;
        outdata.precision(15);
 
        while(infile.good()) {
            std::string line;
            std::getline(infile, line, '\n');
 
            //XXX doing the inverse would be better
            std::map<std::string, std::string>::iterator itr = dictionary_.begin();
            for(;itr != dictionary_.end(); itr++) {
                size_t pos = line.find("_" + itr->first + "_");
                while(pos != std::string::npos) {
                    line.replace(pos, itr->first.length() + 2, itr->second);
                    pos = line.find("_" + itr->first + "_");
                }
            }
 
            outdata << line << std::endl;
        }
        infile.close();
 
        // ensure the contents are written to disk
        std::ofstream outfile(outputFile.c_str());
        outfile.precision(15);
        outfile << outdata.str();
        outfile.flush();
        outfile.rdbuf()->pubsync();
 
        outfile.close();
    }
 
 
private:

    std::string tmplFile_;
    std::string varDictionary_;
    std::map<std::string, std::string> dictionary_;
    std::map<std::string, double> scaleVars_;

    void fillDictionary() {
 
        namespace fs = std::filesystem;
 
        fs::path pwd = fs::current_path();
        if (!fs::exists(varDictionary_) || fs::is_empty(varDictionary_))
            return;
 
        std::ifstream infile;
        infile.open(varDictionary_.c_str(), std::ifstream::in);
 
        char tmp[1024];
        unsigned int line_nr = 0;
        while(infile.good()) {
            std::fill_n(tmp, 1024, '\0');
            infile.getline(tmp, 1024);
            line_nr++;
            if(tmp[0] != '#') {
                std::string stmp(tmp);
                boost::trim(stmp);
                if(stmp.size() == 0)
                    continue;
 
                std::vector<std::string> all_strings;
                boost::split(all_strings, stmp,
                             boost::is_any_of("\r\n\v\f\t "),
                             boost::token_compress_on);
 
                if(all_strings.size() < 2) {
                    std::cout << "PROBLEM with the following line "
                              << "(at least name and value required)!"
                              << std::endl;
                    std::cout << stmp << std::endl;
                    std::ostringstream ex;
                    ex << "Invalid data file on line " << line_nr;
                    throw OptPilotException(
                            "GenerateOpalSimulation::fillDictionary()",
                            ex.str());
                }
 
                std::string varname = all_strings[0];
                std::string value   = all_strings[1];
                scale(varname, &value);
                dictionary_.insert(std::pair<std::string, std::string>(
                            varname, value));
            }
        }
 
        infile.close();
    }
 

    void scale(std::string name, std::string *value) {
        if(scaleVars_.count(name) > 0) {
            std::istringstream instr(*value);
            double val;
            instr >> val;
            val *= scaleVars_[name];
 
            // we keep values as strings, since we have to write them to
            // output streams anyways..
            std::ostringstream of;
            of << val;
            *value = of.str();
        }
    }
 
};
 
#endif