argparser/src/repeat-arg.h

#ifndef ARGPARSER_REPEAT_ARG_H
#define ARGPARSER_REPEAT_ARG_H

#include "argument.h"
#include "errors.h"
#include "parse-result.h"
#include "type.h"
#include <any>
#include <cassert>
#include <memory>
#include <optional>
#include <span>
#include <string>
#include <vector>

namespace argparser {

    template<typename T>
    class repeatable_arg : public arg, public std::enable_shared_from_this<repeatable_arg<T>> {
    public:
        repeatable_arg(std::string name, type_handle_impl<T> type) : arg(std::move(name)), type(type) {}

        std::shared_ptr<repeatable_arg<T>> min(size_t min) {
            min_ = min;
            return this->shared_from_this();
        }

        std::shared_ptr<repeatable_arg<T>> max(size_t max) {
            max_ = max;
            return this->shared_from_this();
        }


        [[nodiscard]] std::vector<T> get(const parse_result &pr) const {
            auto v = pr.get_arg(name);
            if (!v.has_value()) {
                return std::vector<T>{};
            }
            return std::any_cast<std::vector<T>>(v);
        }

        [[nodiscard]] bool has(const parse_result &pr) const {
            return pr.has_arg(name);
        }

    private:
        type_handle_impl<T> type;
        std::optional<size_t> max_;
        std::optional<size_t> min_;

        void do_parse(std::string input, parse_result &pr) const override {
            auto current_val = pr.get_arg(name);
            std::vector<T> values;
            if (current_val.has_value()) {
                values = std::any_cast<std::vector<T>>(current_val);
            }
            assert(!max_.has_value() || values.size() < max_.value());

            auto val = this->parse_single_value(input, type);
            values.push_back(val);
            pr.set_arg(name, std::make_any<std::vector<T>>(std::move(values)));
        }

        [[nodiscard]] bool get_can_parse_more(parse_result &pr) const override {
            if (max_.has_value()) {
                auto val = pr.get_arg(name);
                if (!val.has_value()) {
                    return true;
                }
                return std::any_cast<std::vector<T>>(val).size() < max_.value();
            } else {
                return true;
            }
        }

        [[nodiscard]] bool get_has_parsed_enough(parse_result &pr) const override {
            if (min_.has_value() && min_.value() > 0) {
                auto val = pr.get_arg(name);
                if (!val.has_value()) {
                    return false;
                }
                auto val_ = std::any_cast<std::vector<T>>(val);
                return val_.size() >= min_.value();
            } else {
                return true;
            }
        }
    };

    template<typename T>
    using repeatable_arg_handle = std::shared_ptr<repeatable_arg<T>>;
}// namespace argparser


#endif//ARGPARSER_REPEAT_ARG_H