cppargs/include/cppargs/misc/context.inl

#pragma once

#include <cppcore/conversion/convert_cast.h>

#include "context.h"

namespace cppargs
{

    next_result context::next(std::string* key)
    {
        if (key)
            key->clear();

        if (index + 1 >= argc)
            return next_result::finished;

        ++index;
        arg = argv[index];
        value = nullptr;

        /* check argument */
        int i = 0;
        value = nullptr;
        while (arg[i] == '-')
            ++i;

        /* parse value */
        if (i == 1)
        {
            if (key)
                *key = std::string("-") + arg[1];
            if (arg[2] != '\0')
                value = &arg[2];
            return next_result::option_short;
        }
        else if (i == 2)
        {
            auto tmp = strchr(arg, '=');
            if (tmp)
            {
                value = tmp + 1;
                if (key)
                    *key = std::string(arg, cppcore::convert_cast<size_t>(tmp - arg));
            }
            else if (key)
            {
                *key = arg;
            }
            return next_result::option_long;
        }
        else
        {
            return next_result::argument;
        }
    }

}