custom_parser.hpp

// Copyright (C) 2022 by Camden Mannett.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE or copy at https://www.boost.org/LICENSE_1_0.txt)
 
#pragma once
 
#include "arg_router/parsing/token_type.hpp"
#include "arg_router/policy/policy.hpp"
 
#include <functional>
#include <string_view>
 
namespace arg_router::policy
{
template <typename T>
class custom_parser
{
public:
    using value_type = T;
 
    using parser_type = std::function<value_type(std::string_view)>;
 
    constexpr explicit custom_parser(parser_type p) noexcept : parser_{std::move(p)} {}
 
    template <typename ValueType, typename... Parents>
    [[nodiscard]] constexpr ValueType parse_phase(std::string_view token,
                                                  [[maybe_unused]] const Parents&... parents) const
    {
        return parser_(token);
    }
 
private:
    parser_type parser_;
};
 
template <typename... Args>
struct is_policy<custom_parser<Args...>> : std::true_type {
};
}  // namespace arg_router::policy