argparser/src/single-flag.h

#ifndef ARGPARSER_SINGLE_FLAG_H
#define ARGPARSER_SINGLE_FLAG_H

#include <cassert>
#include <memory>
#include <optional>
#include <string>

#include "option.h"
#include "parse-result.h"
#include "type.h"

namespace argparser {

    class flag_impl : public option, public std::enable_shared_from_this<flag_impl> {
    public:
        explicit flag_impl(std::string name) : option(std::move(name)) {}

        [[nodiscard]] bool is_inverted() const {
            return is_inverted_;
        }

        std::shared_ptr<flag_impl> invert() {
            this->is_inverted_ = true;
            return this->shared_from_this();
        }

        [[nodiscard]] bool consumes_value() const override {
            return false;
        }

        void validate(const parse_result &) const override {
        }

        [[nodiscard]] bool get(const parse_result &pr) const {
            bool val = pr.has_opt(name);
            if (is_inverted_) {
                val = !val;
            }
            return val;
        }
        [[nodiscard]] bool has(const parse_result &pr) const {
            return pr.has_opt(name);
        }

    private:
        void do_parse(std::optional<std::string> arg, std::any &val) override {
            assert(!arg.has_value());
            if (!val.has_value()) {
                val = std::make_any<bool>(true);
            }
        }
        bool is_inverted_{};
    };

    using flag_handle_impl = std::shared_ptr<flag_impl>;

}// namespace argparser

#endif//ARGPARSER_SINGLE_FLAG_H