argparser/src/repeat-opt.h

#ifndef ARGPARSER_REPEAT_OPT_H
#define ARGPARSER_REPEAT_OPT_H

#include <cassert>
#include <format>
#include <memory>
#include <string>
#include <vector>

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

namespace argparser {

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

        std::shared_ptr<repeatable_option_impl<T>> default_value(std::vector<T> val) {
            this->default_value_ = std::make_optional(val);
            return this->shared_from_this();
        }

        std::shared_ptr<repeatable_option_impl<T>> min(unsigned int min) {
            this->min_ = min;
            return this->shared_from_this();
        }

        std::shared_ptr<repeatable_option_impl<T>> max(unsigned int max) {
            this->max_ = max;
            return this->shared_from_this();
        }

        void validate(const parse_result &pr) const override {
            unsigned int count = 0;
            if (pr.has_opt(this->name)) {
                count = get(pr).size();
            }
            if ((min_.has_value() && count < min_.value()) ||
                (max_.has_value() && count > max_.value())) {
                throw errors::wrong_option_count_error(this->name, min_, max_, count);
            }
        }

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

        [[nodiscard]] std::vector<T> get(const parse_result &pr) const {
            auto v = pr.get_opt(name);
            if (!v.has_value()) {
                if (default_value_.has_value()) {
                    return default_value_.value();
                }
                throw std::runtime_error(std::format("option {} was not provided", name));
            }
            return std::any_cast<std::vector<T>>(v);
        }
        [[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());
            const char *parse_end;
            auto begin = &*arg->begin();
            auto end = &*arg->end();
            auto single_val = this->type->parse(begin, end, parse_end, internal::parser_allow_undelimited::Any);
            if (parse_end != end) {
                throw errors::type_parsing_error(this->type->get_name(), std::string(begin, end), parse_end - begin, "unexpected input");
            }
            std::vector<T> val_vec{};
            if (val.has_value()) {
                val_vec = std::any_cast<std::vector<T>>(val);
            }
            val_vec.push_back(single_val);
            val = std::make_any<std::vector<T>>(val_vec);
        }

        type_handle_impl<T> type;

        std::optional<std::vector<T>> default_value_ = std::nullopt;
        std::optional<unsigned int> min_ = std::nullopt;
        std::optional<unsigned int> max_ = std::nullopt;
    };

    template<typename T>
    using repeatable_option_handle_impl = std::shared_ptr<repeatable_option_impl<T>>;

}// namespace argparser

#endif//ARGPARSER_REPEAT_OPT_H