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https://git.lynn.is/Gwen/argparser.git
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60 lines
1.7 KiB
C++
60 lines
1.7 KiB
C++
#ifndef ARGPARSER_ARGUMENT_H
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#define ARGPARSER_ARGUMENT_H
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#include "errors.h"
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#include "parse-result.h"
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#include "type.h"
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#include <any>
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#include <memory>
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#include <span>
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#include <string>
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namespace argparser {
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class arg {
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public:
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explicit arg(std::string name) : name(std::move(name)) {}
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virtual ~arg() = default;
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void parse(const std::string &input, parse_result &pr) const {
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do_parse(input, pr);
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}
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[[nodiscard]] bool has_parsed_enough(parse_result &pr) const {
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return this->get_has_parsed_enough(pr);
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}
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[[nodiscard]] bool can_parse_more(parse_result &pr) const {
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return this->get_can_parse_more(pr);
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}
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[[nodiscard]] std::string get_name() const {
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return name;
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}
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protected:
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const std::string name;
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template<typename T>
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static T parse_single_value(std::string input, const type_handle_impl<T> &type) {
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const char *parse_end;
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auto begin = &*input.begin();
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auto end = &*input.end();
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auto val = type->parse(begin, end, parse_end, internal::parser_allow_undelimited::Any);
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if (parse_end != end) {
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throw errors::type_parsing_error(type->get_name(), std::string(begin, end), parse_end - begin, "unexpected input");
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}
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return val;
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}
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private:
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virtual void do_parse(std::string input, parse_result &pr) const = 0;
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[[nodiscard]] virtual bool get_has_parsed_enough(parse_result &pr) const = 0;
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[[nodiscard]] virtual bool get_can_parse_more(parse_result &pr) const = 0;
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};
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using arg_handle = std::shared_ptr<arg>;
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}// namespace argparser
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#endif//ARGPARSER_ARGUMENT_H
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