actions.hpp

// The MIT License (MIT)

// Copyright (c) 2012-2014 Danny Y., Rapptz

// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

#ifndef GEARS_OPTPAESE_ACTIONS_HPP
#define GEARS_OPTPAESE_ACTIONS_HPP

#include "../string/lexical_cast.hpp"
#include <functional>
#include <iterator>

namespace gears {
namespace optparse {
template<typename T>
struct store {
    T operator()(const std::string&, const std::string& value) const {
        return string::lexical_cast<T>(value);
    }
};

template<>
struct store<bool> {
    bool operator()(const std::string& key, const std::string& value) const {
        if(value == "1" || value == "true") {
            return true;
        }
        else if(value == "0" || value == "false") {
            return false;
        }

        throw std::runtime_error("invalid boolean argument passed to '" + key + '\'');
    }
};

template<typename T>
struct store_const {
private:
    T value;
public:
    store_const(T val): value(std::move(val)) {}

    T operator()(const std::string&, const std::string&) const {
        return value;
    }
};

template<typename Container, typename Action = store<typename Container::value_type>>
struct store_list {
    static_assert(std::is_convertible<decltype(std::declval<Action>()("","")), typename Container::value_type>::value,
                  "The action must return a type convertible to the container's value type");
private:
    Action action;
public:
    store_list(Action action): action(std::move(action)) {}
    Container operator()(const std::string& key, const std::string& value) const {
        Container result;
        std::istringstream ss(value);
        std::insert_iterator<Container> it(result, result.end());
        for(std::string str; std::getline(ss, str); ) {
            *it = action(key, str);
        }
        return result;
    }
};


template<typename Container>
struct append {
private:
    using value_type = typename Container::value_type;
    std::function<value_type(const std::string&, const std::string&)> action;
    Container cont;
public:
    template<typename Action>
    append(Action action): action(std::move(action)) {}

    Container operator()(const std::string& key, const std::string& value) {
        cont.insert(cont.end(), action(key, value));
        return cont;
    }
};
} // optparse
} // gears

#endif // GEARS_OPTPAESE_ACTIONS_HPP