567 lines
21 KiB
C++
567 lines
21 KiB
C++
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/**
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* License: Apache 2.0 with LLVM Exception or GPL v3
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*
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* Author: Jesse Laning
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*/
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#ifndef ARGPARSE_H
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#define ARGPARSE_H
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#include <algorithm>
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#include <cctype>
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#include <cstring>
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#include <iomanip>
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#include <iostream>
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#include <locale>
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#include <map>
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#include <numeric>
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#include <sstream>
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#include <stdexcept>
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#include <string>
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#include <unordered_map>
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#include <vector>
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namespace argparse {
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namespace detail {
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static inline bool _not_space(int ch) { return !std::isspace(ch); }
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static inline void _ltrim(std::string &s, bool (*f)(int) = _not_space) {
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s.erase(s.begin(), std::find_if(s.begin(), s.end(), f));
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}
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static inline void _rtrim(std::string &s, bool (*f)(int) = _not_space) {
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s.erase(std::find_if(s.rbegin(), s.rend(), f).base(), s.end());
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}
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static inline void _trim(std::string &s, bool (*f)(int) = _not_space) {
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_ltrim(s, f);
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_rtrim(s, f);
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}
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static inline std::string _ltrim_copy(std::string s,
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bool (*f)(int) = _not_space) {
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_ltrim(s, f);
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return s;
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}
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static inline std::string _rtrim_copy(std::string s,
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bool (*f)(int) = _not_space) {
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_rtrim(s, f);
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return s;
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}
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static inline std::string _trim_copy(std::string s,
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bool (*f)(int) = _not_space) {
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_trim(s, f);
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return s;
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}
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template <typename InputIt>
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static inline std::string _join(InputIt begin, InputIt end,
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const std::string &separator = " ") {
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std::ostringstream ss;
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if (begin != end) {
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ss << *begin++;
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}
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while (begin != end) {
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ss << separator;
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ss << *begin++;
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}
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return ss.str();
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}
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static inline bool _is_number(const std::string &arg) {
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std::istringstream iss(arg);
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float f;
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iss >> std::noskipws >> f;
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return iss.eof() && !iss.fail();
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}
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static inline int _find_equal(const std::string &s) {
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for (size_t i = 0; i < s.length(); ++i) {
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// if find graph symbol before equal, end search
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// i.e. don't accept --asd)f=0 arguments
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// but allow --asd_f and --asd-f arguments
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if (std::ispunct(static_cast<int>(s[i]))) {
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if (s[i] == '=') {
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return static_cast<int>(i);
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} else if (s[i] == '_' || s[i] == '-') {
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continue;
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}
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return -1;
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}
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}
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return -1;
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}
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static inline size_t _find_name_end(const std::string &s) {
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size_t i;
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for (i = 0; i < s.length(); ++i) {
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if (std::ispunct(static_cast<int>(s[i]))) {
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break;
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}
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}
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return i;
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}
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namespace is_vector_impl {
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template <typename T>
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struct is_vector : std::false_type {};
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template <typename... Args>
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struct is_vector<std::vector<Args...>> : std::true_type {};
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} // namespace is_vector_impl
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// type trait to utilize the implementation type traits as well as decay the
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// type
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template <typename T>
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struct is_vector {
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static constexpr bool const value =
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is_vector_impl::is_vector<typename std::decay<T>::type>::value;
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};
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} // namespace detail
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class ArgumentParser {
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private:
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public:
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class Argument;
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class Result {
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public:
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Result() {}
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Result(std::string err) noexcept : _error(true), _what(err) {}
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operator bool() const { return _error; }
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friend std::ostream &operator<<(std::ostream &os, const Result &dt);
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const std::string &what() const { return _what; }
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private:
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bool _error{false};
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std::string _what{};
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};
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class Argument {
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public:
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enum Position : int { LAST = -1, DONT_CARE = -2 };
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enum Count : int { ANY = -1 };
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Argument &name(const std::string &name) {
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_names.push_back(name);
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return *this;
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}
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Argument &names(std::vector<std::string> names) {
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_names.insert(_names.end(), names.begin(), names.end());
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return *this;
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}
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Argument &description(const std::string &description) {
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_desc = description;
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return *this;
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}
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Argument &required(bool req) {
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_required = req;
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return *this;
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}
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Argument &position(int position) {
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if (position != Position::LAST) {
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// position + 1 because technically argument zero is the name of the
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// executable
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_position = position + 1;
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} else {
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_position = position;
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}
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return *this;
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}
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Argument &count(int count) {
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_count = count;
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return *this;
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}
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bool found() const { return _found; }
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template <typename T>
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typename std::enable_if<detail::is_vector<T>::value, T>::type get() {
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T t = T();
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typename T::value_type vt;
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for (auto &s : _values) {
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std::istringstream in(s);
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in >> vt;
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t.push_back(vt);
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}
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return t;
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}
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template <typename T>
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typename std::enable_if<!detail::is_vector<T>::value, T>::type get() {
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std::istringstream in(get<std::string>());
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T t = T();
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in >> t >> std::ws;
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return t;
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}
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private:
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Argument(const std::string &name, const std::string &desc,
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bool required = false)
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: _desc(desc), _required(required) {
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_names.push_back(name);
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}
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Argument() {}
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friend class ArgumentParser;
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int _position{Position::DONT_CARE};
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int _count{Count::ANY};
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std::vector<std::string> _names{};
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std::string _desc{};
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bool _found{false};
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bool _required{false};
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int _index{-1};
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std::vector<std::string> _values{};
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};
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ArgumentParser(const std::string &bin, const std::string &desc)
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: _bin(bin), _desc(desc) {}
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Argument &add_argument() {
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_arguments.push_back({});
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_arguments.back()._index = static_cast<int>(_arguments.size()) - 1;
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return _arguments.back();
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}
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Argument &add_argument(const std::string &name, const std::string &long_name,
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const std::string &desc, const bool required = false) {
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_arguments.push_back(Argument(name, desc, required));
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_arguments.back()._names.push_back(long_name);
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_arguments.back()._index = static_cast<int>(_arguments.size()) - 1;
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return _arguments.back();
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}
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Argument &add_argument(const std::string &name, const std::string &desc,
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const bool required = false) {
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_arguments.push_back(Argument(name, desc, required));
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_arguments.back()._index = static_cast<int>(_arguments.size()) - 1;
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return _arguments.back();
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}
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void print_help(size_t count = 0, size_t page = 0) {
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if (page * count > _arguments.size()) {
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return;
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}
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if (page == 0) {
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std::cout << "Usage: " << _bin;
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if (_positional_arguments.empty()) {
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std::cout << " [options...]" << std::endl;
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} else {
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int current = 1;
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for (auto &v : _positional_arguments) {
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if (v.first != Argument::Position::LAST) {
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for (; current < v.first; current++) {
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std::cout << " [" << current << "]";
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}
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std::cout
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<< " ["
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<< detail::_ltrim_copy(
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_arguments[static_cast<size_t>(v.second)]._names[0],
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[](int c) -> bool { return c != static_cast<int>('-'); })
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<< "]";
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}
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}
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auto it = _positional_arguments.find(Argument::Position::LAST);
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if (it == _positional_arguments.end()) {
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std::cout << " [options...]";
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} else {
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std::cout
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<< " [options...] ["
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<< detail::_ltrim_copy(
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_arguments[static_cast<size_t>(it->second)]._names[0],
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[](int c) -> bool { return c != static_cast<int>('-'); })
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<< "]";
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}
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std::cout << std::endl;
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}
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std::cout << "Options:" << std::endl;
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}
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if (count == 0) {
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page = 0;
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count = _arguments.size();
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}
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for (size_t i = page * count;
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i < std::min<size_t>(page * count + count, _arguments.size()); i++) {
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Argument &a = _arguments[i];
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std::string name = a._names[0];
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for (size_t n = 1; n < a._names.size(); ++n) {
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name.append(", " + a._names[n]);
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}
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std::cout << " " << std::setw(23) << std::left << name << std::setw(23)
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<< a._desc;
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if (a._required) {
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std::cout << " (Required)";
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}
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std::cout << std::endl;
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}
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}
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Result parse(int argc, const char *argv[]) {
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Result err;
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if (argc > 1) {
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// build name map
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for (auto &a : _arguments) {
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for (auto &n : a._names) {
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std::string name = detail::_ltrim_copy(
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n, [](int c) -> bool { return c != static_cast<int>('-'); });
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if (_name_map.find(name) != _name_map.end()) {
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return Result("Duplicate of argument name: " + n);
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}
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_name_map[name] = a._index;
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}
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if (a._position >= 0 || a._position == Argument::Position::LAST) {
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_positional_arguments[a._position] = a._index;
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}
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}
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if (err) {
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return err;
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}
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// parse
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std::string current_arg;
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size_t arg_len;
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for (int argv_index = 1; argv_index < argc; ++argv_index) {
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current_arg = std::string(argv[argv_index]);
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arg_len = current_arg.length();
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if (arg_len == 0) {
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continue;
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}
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if (_help_enabled && (current_arg == "-h" || current_arg == "--help")) {
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_arguments[static_cast<size_t>(_name_map["help"])]._found = true;
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} else if (argv_index == argc - 1 &&
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_positional_arguments.find(Argument::Position::LAST) !=
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_positional_arguments.end()) {
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err = _end_argument();
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Result b = err;
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err = _add_value(current_arg, Argument::Position::LAST);
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if (b) {
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return b;
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}
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if (err) {
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return err;
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}
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} else if (arg_len >= 2 &&
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!detail::_is_number(current_arg)) { // ignores the case if
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// the arg is just a -
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// look for -a (short) or --arg (long) args
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if (current_arg[0] == '-') {
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err = _end_argument();
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if (err) {
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return err;
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}
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// look for --arg (long) args
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if (current_arg[1] == '-') {
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err = _begin_argument(current_arg.substr(2), true, argv_index);
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if (err) {
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return err;
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}
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} else { // short args
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err = _begin_argument(current_arg.substr(1), false, argv_index);
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if (err) {
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return err;
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}
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}
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} else { // argument value
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err = _add_value(current_arg, argv_index);
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if (err) {
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return err;
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}
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}
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} else { // argument value
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err = _add_value(current_arg, argv_index);
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if (err) {
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return err;
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}
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}
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}
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}
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if (_help_enabled && exists("help")) {
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return Result();
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}
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err = _end_argument();
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if (err) {
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return err;
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|
}
|
||
|
|
for (auto &p : _positional_arguments) {
|
||
|
|
Argument &a = _arguments[static_cast<size_t>(p.second)];
|
||
|
|
if (a._values.size() > 0 && a._values[0][0] == '-') {
|
||
|
|
std::string name = detail::_ltrim_copy(a._values[0], [](int c) -> bool {
|
||
|
|
return c != static_cast<int>('-');
|
||
|
|
});
|
||
|
|
if (_name_map.find(name) != _name_map.end()) {
|
||
|
|
if (a._position == Argument::Position::LAST) {
|
||
|
|
return Result(
|
||
|
|
"Poisitional argument expected at the end, but argument " +
|
||
|
|
a._values[0] + " found instead");
|
||
|
|
} else {
|
||
|
|
return Result("Poisitional argument expected in position " +
|
||
|
|
std::to_string(a._position) + ", but argument " +
|
||
|
|
a._values[0] + " found instead");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
for (auto &a : _arguments) {
|
||
|
|
if (a._required && !a._found) {
|
||
|
|
return Result("Required argument not found: " + a._names[0]);
|
||
|
|
}
|
||
|
|
if (a._position >= 0 && argc >= a._position && !a._found) {
|
||
|
|
return Result("Argument " + a._names[0] + " expected in position " +
|
||
|
|
std::to_string(a._position));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return Result();
|
||
|
|
}
|
||
|
|
|
||
|
|
void enable_help() {
|
||
|
|
add_argument("-h", "--help", "Shows this page", false);
|
||
|
|
_help_enabled = true;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool exists(const std::string &name) const {
|
||
|
|
std::string n = detail::_ltrim_copy(
|
||
|
|
name, [](int c) -> bool { return c != static_cast<int>('-'); });
|
||
|
|
auto it = _name_map.find(n);
|
||
|
|
if (it != _name_map.end()) {
|
||
|
|
return _arguments[static_cast<size_t>(it->second)]._found;
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
template <typename T>
|
||
|
|
T get(const std::string &name) {
|
||
|
|
auto t = _name_map.find(name);
|
||
|
|
if (t != _name_map.end()) {
|
||
|
|
return _arguments[static_cast<size_t>(t->second)].get<T>();
|
||
|
|
}
|
||
|
|
return T();
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
Result _begin_argument(const std::string &arg, bool longarg, int position) {
|
||
|
|
auto it = _positional_arguments.find(position);
|
||
|
|
if (it != _positional_arguments.end()) {
|
||
|
|
Result err = _end_argument();
|
||
|
|
Argument &a = _arguments[static_cast<size_t>(it->second)];
|
||
|
|
a._values.push_back((longarg ? "--" : "-") + arg);
|
||
|
|
a._found = true;
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
if (_current != -1) {
|
||
|
|
return Result("Current argument left open");
|
||
|
|
}
|
||
|
|
size_t name_end = detail::_find_name_end(arg);
|
||
|
|
std::string arg_name = arg.substr(0, name_end);
|
||
|
|
if (longarg) {
|
||
|
|
int equal_pos = detail::_find_equal(arg);
|
||
|
|
auto nmf = _name_map.find(arg_name);
|
||
|
|
if (nmf == _name_map.end()) {
|
||
|
|
return Result("Unrecognized command line option '" + arg_name + "'");
|
||
|
|
}
|
||
|
|
_current = nmf->second;
|
||
|
|
_arguments[static_cast<size_t>(nmf->second)]._found = true;
|
||
|
|
if (equal_pos == 0 ||
|
||
|
|
(equal_pos < 0 &&
|
||
|
|
arg_name.length() < arg.length())) { // malformed argument
|
||
|
|
return Result("Malformed argument: " + arg);
|
||
|
|
} else if (equal_pos > 0) {
|
||
|
|
std::string arg_value = arg.substr(name_end + 1);
|
||
|
|
_add_value(arg_value, position);
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
Result r;
|
||
|
|
if (arg_name.length() == 1) {
|
||
|
|
return _begin_argument(arg, true, position);
|
||
|
|
} else {
|
||
|
|
for (char &c : arg_name) {
|
||
|
|
r = _begin_argument(std::string(1, c), true, position);
|
||
|
|
if (r) {
|
||
|
|
return r;
|
||
|
|
}
|
||
|
|
r = _end_argument();
|
||
|
|
if (r) {
|
||
|
|
return r;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return Result();
|
||
|
|
}
|
||
|
|
|
||
|
|
Result _add_value(const std::string &value, int location) {
|
||
|
|
if (_current >= 0) {
|
||
|
|
Result err;
|
||
|
|
Argument &a = _arguments[static_cast<size_t>(_current)];
|
||
|
|
if (a._count >= 0 && static_cast<int>(a._values.size()) >= a._count) {
|
||
|
|
err = _end_argument();
|
||
|
|
if (err) {
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
goto unnamed;
|
||
|
|
}
|
||
|
|
a._values.push_back(value);
|
||
|
|
if (a._count >= 0 && static_cast<int>(a._values.size()) >= a._count) {
|
||
|
|
err = _end_argument();
|
||
|
|
if (err) {
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return Result();
|
||
|
|
} else {
|
||
|
|
unnamed:
|
||
|
|
auto it = _positional_arguments.find(location);
|
||
|
|
if (it != _positional_arguments.end()) {
|
||
|
|
Argument &a = _arguments[static_cast<size_t>(it->second)];
|
||
|
|
a._values.push_back(value);
|
||
|
|
a._found = true;
|
||
|
|
}
|
||
|
|
// TODO
|
||
|
|
return Result();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
Result _end_argument() {
|
||
|
|
if (_current >= 0) {
|
||
|
|
Argument &a = _arguments[static_cast<size_t>(_current)];
|
||
|
|
_current = -1;
|
||
|
|
if (static_cast<int>(a._values.size()) < a._count) {
|
||
|
|
return Result("Too few arguments given for " + a._names[0]);
|
||
|
|
}
|
||
|
|
if (a._count >= 0) {
|
||
|
|
if (static_cast<int>(a._values.size()) > a._count) {
|
||
|
|
return Result("Too many arguments given for " + a._names[0]);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return Result();
|
||
|
|
}
|
||
|
|
|
||
|
|
bool _help_enabled{false};
|
||
|
|
int _current{-1};
|
||
|
|
std::string _bin{};
|
||
|
|
std::string _desc{};
|
||
|
|
std::vector<Argument> _arguments{};
|
||
|
|
std::map<int, int> _positional_arguments{};
|
||
|
|
std::map<std::string, int> _name_map{};
|
||
|
|
};
|
||
|
|
|
||
|
|
std::ostream &operator<<(std::ostream &os, const ArgumentParser::Result &r) {
|
||
|
|
os << r.what();
|
||
|
|
return os;
|
||
|
|
}
|
||
|
|
template <>
|
||
|
|
inline std::string ArgumentParser::Argument::get<std::string>() {
|
||
|
|
return detail::_join(_values.begin(), _values.end());
|
||
|
|
}
|
||
|
|
template <>
|
||
|
|
inline std::vector<std::string>
|
||
|
|
ArgumentParser::Argument::get<std::vector<std::string>>() {
|
||
|
|
return _values;
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace argparse
|
||
|
|
#endif
|