flightgear/utils/fgviewer/ArgumentParser.cxx

// ArgumentParser.cxx -- flightgear viewer argument parser
//
// Copyright (C) 2021 by Erik Hofman
//
// This program 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.
//
// This program 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 this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.


#include <cstring>
#include <iostream>
#include <string>
#include <map>

#include "ArgumentParser.hxx"

ArgumentParser::ArgumentParser(int argc, char **argv) :
   arg_num(argc),
   arg_values(argv),
   appName(argv[0]),
   arguments( osg::ArgumentParser(&arg_num, arg_values) )
{
    for (int i=1; i<argc; i++)
    {
        std::string arg = argv[i];
        std::string val;

        if (arg[0] == '-')
        {
            std::size_t pos = arg.find('='); 
            if (pos != std::string::npos)
            {
                val = arg.substr(pos+1);
                arg = arg.substr(0, pos);
            }
            else if ((i+1)<argc && argv[i+1][0] != '-') {
                val = argv[++i];
            } else {
                val = "";
            }

            args[arg] = val;
        }
        else {
            files.push_back(arg);
        }
    }
}

bool
ArgumentParser::read(const char *arg)
{
    auto it = args.find(arg);
    if (it != args.end())
    {
        args.erase(it);
        return true;
    }
    return false;
}

bool
ArgumentParser::read(const char *arg, std::string& value)
{
    auto it = args.find(arg);
    if (it != args.end())
    {
        value = it->second;
        args.erase(it);
        return true;
    }
    return false;
}
 
bool
ArgumentParser::read(const char *arg, std::string& name, std::string& value)
{
    auto it = args.find(arg);

    // old fgviewer behavior: --prop name=value
    if (it != args.end()) {
        std::string str = it->second;

        std::size_t pos = str.find("=");
        if (pos != std::string::npos && pos != str.size())
        {
            value = str.substr(pos);
            name = str.substr(0, pos);
            args.erase(it);
            return true;
        }
    }

    // FlightGear behavior: --prop:name=value
    std::string str = name;
    str += ':'; 
    str += name;

    it = args.find(str);
    if (it != args.end())
    {
        value = it->second;
        args.erase(it);
        return true;
    }

    return false;
}

void
ArgumentParser::reportRemainingOptionsAsUnrecognized()
{
   for (auto it : args) {
      std::cerr << "Unsupported argument: " << it.first << std::endl;
   }
}


void
ArgumentParser::writeErrorMessages(std::ostream& output)
{
}