IVGCVSW-4488 Adding cxxopts to third-party
* as alternative for boost::program_options
* added to cmake
* added to TPIP list in readme.md
Signed-off-by: Jan Eilers <jan.eilers@arm.com>
Change-Id: Id8c6a12c988196cdac55650bc4761c08a39b3abb
diff --git a/third-party/cxxopts/cxxopts.hpp b/third-party/cxxopts/cxxopts.hpp
new file mode 100644
index 0000000..97381a9
--- /dev/null
+++ b/third-party/cxxopts/cxxopts.hpp
@@ -0,0 +1,2197 @@
+/*
+
+Copyright (c) 2014, 2015, 2016, 2017 Jarryd Beck
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
+*/
+
+#ifndef CXXOPTS_HPP_INCLUDED
+#define CXXOPTS_HPP_INCLUDED
+
+#include <cctype>
+#include <cstring>
+#include <exception>
+#include <iostream>
+#include <limits>
+#include <map>
+#include <memory>
+#include <regex>
+#include <sstream>
+#include <string>
+#include <unordered_map>
+#include <unordered_set>
+#include <utility>
+#include <vector>
+
+#ifdef __cpp_lib_optional
+#include <optional>
+#define CXXOPTS_HAS_OPTIONAL
+#endif
+
+#ifndef CXXOPTS_VECTOR_DELIMITER
+#define CXXOPTS_VECTOR_DELIMITER ','
+#endif
+
+#define CXXOPTS__VERSION_MAJOR 2
+#define CXXOPTS__VERSION_MINOR 2
+#define CXXOPTS__VERSION_PATCH 0
+
+namespace cxxopts
+{
+ static constexpr struct {
+ uint8_t major, minor, patch;
+ } version = {
+ CXXOPTS__VERSION_MAJOR,
+ CXXOPTS__VERSION_MINOR,
+ CXXOPTS__VERSION_PATCH
+ };
+} // namespace cxxopts
+
+//when we ask cxxopts to use Unicode, help strings are processed using ICU,
+//which results in the correct lengths being computed for strings when they
+//are formatted for the help output
+//it is necessary to make sure that <unicode/unistr.h> can be found by the
+//compiler, and that icu-uc is linked in to the binary.
+
+#ifdef CXXOPTS_USE_UNICODE
+#include <unicode/unistr.h>
+
+namespace cxxopts
+{
+ typedef icu::UnicodeString String;
+
+ inline
+ String
+ toLocalString(std::string s)
+ {
+ return icu::UnicodeString::fromUTF8(std::move(s));
+ }
+
+ class UnicodeStringIterator : public
+ std::iterator<std::forward_iterator_tag, int32_t>
+ {
+ public:
+
+ UnicodeStringIterator(const icu::UnicodeString* string, int32_t pos)
+ : s(string)
+ , i(pos)
+ {
+ }
+
+ value_type
+ operator*() const
+ {
+ return s->char32At(i);
+ }
+
+ bool
+ operator==(const UnicodeStringIterator& rhs) const
+ {
+ return s == rhs.s && i == rhs.i;
+ }
+
+ bool
+ operator!=(const UnicodeStringIterator& rhs) const
+ {
+ return !(*this == rhs);
+ }
+
+ UnicodeStringIterator&
+ operator++()
+ {
+ ++i;
+ return *this;
+ }
+
+ UnicodeStringIterator
+ operator+(int32_t v)
+ {
+ return UnicodeStringIterator(s, i + v);
+ }
+
+ private:
+ const icu::UnicodeString* s;
+ int32_t i;
+ };
+
+ inline
+ String&
+ stringAppend(String&s, String a)
+ {
+ return s.append(std::move(a));
+ }
+
+ inline
+ String&
+ stringAppend(String& s, int n, UChar32 c)
+ {
+ for (int i = 0; i != n; ++i)
+ {
+ s.append(c);
+ }
+
+ return s;
+ }
+
+ template <typename Iterator>
+ String&
+ stringAppend(String& s, Iterator begin, Iterator end)
+ {
+ while (begin != end)
+ {
+ s.append(*begin);
+ ++begin;
+ }
+
+ return s;
+ }
+
+ inline
+ size_t
+ stringLength(const String& s)
+ {
+ return s.length();
+ }
+
+ inline
+ std::string
+ toUTF8String(const String& s)
+ {
+ std::string result;
+ s.toUTF8String(result);
+
+ return result;
+ }
+
+ inline
+ bool
+ empty(const String& s)
+ {
+ return s.isEmpty();
+ }
+}
+
+namespace std
+{
+ inline
+ cxxopts::UnicodeStringIterator
+ begin(const icu::UnicodeString& s)
+ {
+ return cxxopts::UnicodeStringIterator(&s, 0);
+ }
+
+ inline
+ cxxopts::UnicodeStringIterator
+ end(const icu::UnicodeString& s)
+ {
+ return cxxopts::UnicodeStringIterator(&s, s.length());
+ }
+}
+
+//ifdef CXXOPTS_USE_UNICODE
+#else
+
+namespace cxxopts
+{
+ typedef std::string String;
+
+ template <typename T>
+ T
+ toLocalString(T&& t)
+ {
+ return std::forward<T>(t);
+ }
+
+ inline
+ size_t
+ stringLength(const String& s)
+ {
+ return s.length();
+ }
+
+ inline
+ String&
+ stringAppend(String&s, const String& a)
+ {
+ return s.append(a);
+ }
+
+ inline
+ String&
+ stringAppend(String& s, size_t n, char c)
+ {
+ return s.append(n, c);
+ }
+
+ template <typename Iterator>
+ String&
+ stringAppend(String& s, Iterator begin, Iterator end)
+ {
+ return s.append(begin, end);
+ }
+
+ template <typename T>
+ std::string
+ toUTF8String(T&& t)
+ {
+ return std::forward<T>(t);
+ }
+
+ inline
+ bool
+ empty(const std::string& s)
+ {
+ return s.empty();
+ }
+} // namespace cxxopts
+
+//ifdef CXXOPTS_USE_UNICODE
+#endif
+
+namespace cxxopts
+{
+ namespace
+ {
+#ifdef _WIN32
+ const std::string LQUOTE("\'");
+ const std::string RQUOTE("\'");
+#else
+ const std::string LQUOTE("‘");
+ const std::string RQUOTE("’");
+#endif
+ } // namespace
+
+ class Value : public std::enable_shared_from_this<Value>
+ {
+ public:
+
+ virtual ~Value() = default;
+
+ virtual
+ std::shared_ptr<Value>
+ clone() const = 0;
+
+ virtual void
+ parse(const std::string& text) const = 0;
+
+ virtual void
+ parse() const = 0;
+
+ virtual bool
+ has_default() const = 0;
+
+ virtual bool
+ is_container() const = 0;
+
+ virtual bool
+ has_implicit() const = 0;
+
+ virtual std::string
+ get_default_value() const = 0;
+
+ virtual std::string
+ get_implicit_value() const = 0;
+
+ virtual std::shared_ptr<Value>
+ default_value(const std::string& value) = 0;
+
+ virtual std::shared_ptr<Value>
+ implicit_value(const std::string& value) = 0;
+
+ virtual std::shared_ptr<Value>
+ no_implicit_value() = 0;
+
+ virtual bool
+ is_boolean() const = 0;
+ };
+
+ class OptionException : public std::exception
+ {
+ public:
+ explicit OptionException(std::string message)
+ : m_message(std::move(message))
+ {
+ }
+
+ const char*
+ what() const noexcept override
+ {
+ return m_message.c_str();
+ }
+
+ private:
+ std::string m_message;
+ };
+
+ class OptionSpecException : public OptionException
+ {
+ public:
+
+ explicit OptionSpecException(const std::string& message)
+ : OptionException(message)
+ {
+ }
+ };
+
+ class OptionParseException : public OptionException
+ {
+ public:
+ explicit OptionParseException(const std::string& message)
+ : OptionException(message)
+ {
+ }
+ };
+
+ class option_exists_error : public OptionSpecException
+ {
+ public:
+ explicit option_exists_error(const std::string& option)
+ : OptionSpecException("Option " + LQUOTE + option + RQUOTE + " already exists")
+ {
+ }
+ };
+
+ class invalid_option_format_error : public OptionSpecException
+ {
+ public:
+ explicit invalid_option_format_error(const std::string& format)
+ : OptionSpecException("Invalid option format " + LQUOTE + format + RQUOTE)
+ {
+ }
+ };
+
+ class option_syntax_exception : public OptionParseException {
+ public:
+ explicit option_syntax_exception(const std::string& text)
+ : OptionParseException("Argument " + LQUOTE + text + RQUOTE +
+ " starts with a - but has incorrect syntax")
+ {
+ }
+ };
+
+ class option_not_exists_exception : public OptionParseException
+ {
+ public:
+ explicit option_not_exists_exception(const std::string& option)
+ : OptionParseException("Option " + LQUOTE + option + RQUOTE + " does not exist")
+ {
+ }
+ };
+
+ class missing_argument_exception : public OptionParseException
+ {
+ public:
+ explicit missing_argument_exception(const std::string& option)
+ : OptionParseException(
+ "Option " + LQUOTE + option + RQUOTE + " is missing an argument"
+ )
+ {
+ }
+ };
+
+ class option_requires_argument_exception : public OptionParseException
+ {
+ public:
+ explicit option_requires_argument_exception(const std::string& option)
+ : OptionParseException(
+ "Option " + LQUOTE + option + RQUOTE + " requires an argument"
+ )
+ {
+ }
+ };
+
+ class option_not_has_argument_exception : public OptionParseException
+ {
+ public:
+ option_not_has_argument_exception
+ (
+ const std::string& option,
+ const std::string& arg
+ )
+ : OptionParseException(
+ "Option " + LQUOTE + option + RQUOTE +
+ " does not take an argument, but argument " +
+ LQUOTE + arg + RQUOTE + " given"
+ )
+ {
+ }
+ };
+
+ class option_not_present_exception : public OptionParseException
+ {
+ public:
+ explicit option_not_present_exception(const std::string& option)
+ : OptionParseException("Option " + LQUOTE + option + RQUOTE + " not present")
+ {
+ }
+ };
+
+ class argument_incorrect_type : public OptionParseException
+ {
+ public:
+ explicit argument_incorrect_type
+ (
+ const std::string& arg
+ )
+ : OptionParseException(
+ "Argument " + LQUOTE + arg + RQUOTE + " failed to parse"
+ )
+ {
+ }
+ };
+
+ class option_required_exception : public OptionParseException
+ {
+ public:
+ explicit option_required_exception(const std::string& option)
+ : OptionParseException(
+ "Option " + LQUOTE + option + RQUOTE + " is required but not present"
+ )
+ {
+ }
+ };
+
+ template <typename T>
+ void throw_or_mimic(const std::string& text)
+ {
+ static_assert(std::is_base_of<std::exception, T>::value,
+ "throw_or_mimic only works on std::exception and "
+ "deriving classes");
+
+#ifndef CXXOPTS_NO_EXCEPTIONS
+ // If CXXOPTS_NO_EXCEPTIONS is not defined, just throw
+ throw T{text};
+#else
+ // Otherwise manually instantiate the exception, print what() to stderr,
+ // and exit
+ T exception{text};
+ std::cerr << exception.what() << std::endl;
+ std::exit(EXIT_FAILURE);
+#endif
+ }
+
+ namespace values
+ {
+ namespace
+ {
+ std::basic_regex<char> integer_pattern
+ ("(-)?(0x)?([0-9a-zA-Z]+)|((0x)?0)");
+ std::basic_regex<char> truthy_pattern
+ ("(t|T)(rue)?|1");
+ std::basic_regex<char> falsy_pattern
+ ("(f|F)(alse)?|0");
+ } // namespace
+
+ namespace detail
+ {
+ template <typename T, bool B>
+ struct SignedCheck;
+
+ template <typename T>
+ struct SignedCheck<T, true>
+ {
+ template <typename U>
+ void
+ operator()(bool negative, U u, const std::string& text)
+ {
+ if (negative)
+ {
+ if (u > static_cast<U>((std::numeric_limits<T>::min)()))
+ {
+ throw_or_mimic<argument_incorrect_type>(text);
+ }
+ }
+ else
+ {
+ if (u > static_cast<U>((std::numeric_limits<T>::max)()))
+ {
+ throw_or_mimic<argument_incorrect_type>(text);
+ }
+ }
+ }
+ };
+
+ template <typename T>
+ struct SignedCheck<T, false>
+ {
+ template <typename U>
+ void
+ operator()(bool, U, const std::string&) {}
+ };
+
+ template <typename T, typename U>
+ void
+ check_signed_range(bool negative, U value, const std::string& text)
+ {
+ SignedCheck<T, std::numeric_limits<T>::is_signed>()(negative, value, text);
+ }
+ } // namespace detail
+
+ template <typename R, typename T>
+ R
+ checked_negate(T&& t, const std::string&, std::true_type)
+ {
+ // if we got to here, then `t` is a positive number that fits into
+ // `R`. So to avoid MSVC C4146, we first cast it to `R`.
+ // See https://github.com/jarro2783/cxxopts/issues/62 for more details.
+ return static_cast<R>(-static_cast<R>(t-1)-1);
+ }
+
+ template <typename R, typename T>
+ T
+ checked_negate(T&& t, const std::string& text, std::false_type)
+ {
+ throw_or_mimic<argument_incorrect_type>(text);
+ return t;
+ }
+
+ template <typename T>
+ void
+ integer_parser(const std::string& text, T& value)
+ {
+ std::smatch match;
+ std::regex_match(text, match, integer_pattern);
+
+ if (match.length() == 0)
+ {
+ throw_or_mimic<argument_incorrect_type>(text);
+ }
+
+ if (match.length(4) > 0)
+ {
+ value = 0;
+ return;
+ }
+
+ using US = typename std::make_unsigned<T>::type;
+
+ constexpr bool is_signed = std::numeric_limits<T>::is_signed;
+ const bool negative = match.length(1) > 0;
+ const uint8_t base = match.length(2) > 0 ? 16 : 10;
+
+ auto value_match = match[3];
+
+ US result = 0;
+
+ for (auto iter = value_match.first; iter != value_match.second; ++iter)
+ {
+ US digit = 0;
+
+ if (*iter >= '0' && *iter <= '9')
+ {
+ digit = static_cast<US>(*iter - '0');
+ }
+ else if (base == 16 && *iter >= 'a' && *iter <= 'f')
+ {
+ digit = static_cast<US>(*iter - 'a' + 10);
+ }
+ else if (base == 16 && *iter >= 'A' && *iter <= 'F')
+ {
+ digit = static_cast<US>(*iter - 'A' + 10);
+ }
+ else
+ {
+ throw_or_mimic<argument_incorrect_type>(text);
+ }
+
+ const US next = static_cast<US>(result * base + digit);
+ if (result > next)
+ {
+ throw_or_mimic<argument_incorrect_type>(text);
+ }
+
+ result = next;
+ }
+
+ detail::check_signed_range<T>(negative, result, text);
+
+ if (negative)
+ {
+ value = checked_negate<T>(result,
+ text,
+ std::integral_constant<bool, is_signed>());
+ }
+ else
+ {
+ value = static_cast<T>(result);
+ }
+ }
+
+ template <typename T>
+ void stringstream_parser(const std::string& text, T& value)
+ {
+ std::stringstream in(text);
+ in >> value;
+ if (!in) {
+ throw_or_mimic<argument_incorrect_type>(text);
+ }
+ }
+
+ inline
+ void
+ parse_value(const std::string& text, uint8_t& value)
+ {
+ integer_parser(text, value);
+ }
+
+ inline
+ void
+ parse_value(const std::string& text, int8_t& value)
+ {
+ integer_parser(text, value);
+ }
+
+ inline
+ void
+ parse_value(const std::string& text, uint16_t& value)
+ {
+ integer_parser(text, value);
+ }
+
+ inline
+ void
+ parse_value(const std::string& text, int16_t& value)
+ {
+ integer_parser(text, value);
+ }
+
+ inline
+ void
+ parse_value(const std::string& text, uint32_t& value)
+ {
+ integer_parser(text, value);
+ }
+
+ inline
+ void
+ parse_value(const std::string& text, int32_t& value)
+ {
+ integer_parser(text, value);
+ }
+
+ inline
+ void
+ parse_value(const std::string& text, uint64_t& value)
+ {
+ integer_parser(text, value);
+ }
+
+ inline
+ void
+ parse_value(const std::string& text, int64_t& value)
+ {
+ integer_parser(text, value);
+ }
+
+ inline
+ void
+ parse_value(const std::string& text, bool& value)
+ {
+ std::smatch result;
+ std::regex_match(text, result, truthy_pattern);
+
+ if (!result.empty())
+ {
+ value = true;
+ return;
+ }
+
+ std::regex_match(text, result, falsy_pattern);
+ if (!result.empty())
+ {
+ value = false;
+ return;
+ }
+
+ throw_or_mimic<argument_incorrect_type>(text);
+ }
+
+ inline
+ void
+ parse_value(const std::string& text, std::string& value)
+ {
+ value = text;
+ }
+
+ // The fallback parser. It uses the stringstream parser to parse all types
+ // that have not been overloaded explicitly. It has to be placed in the
+ // source code before all other more specialized templates.
+ template <typename T>
+ void
+ parse_value(const std::string& text, T& value) {
+ stringstream_parser(text, value);
+ }
+
+ template <typename T>
+ void
+ parse_value(const std::string& text, std::vector<T>& value)
+ {
+ std::stringstream in(text);
+ std::string token;
+ while(!in.eof() && std::getline(in, token, CXXOPTS_VECTOR_DELIMITER)) {
+ T v;
+ parse_value(token, v);
+ value.emplace_back(std::move(v));
+ }
+ }
+
+#ifdef CXXOPTS_HAS_OPTIONAL
+ template <typename T>
+ void
+ parse_value(const std::string& text, std::optional<T>& value)
+ {
+ T result;
+ parse_value(text, result);
+ value = std::move(result);
+ }
+#endif
+
+ inline
+ void parse_value(const std::string& text, char& c)
+ {
+ if (text.length() != 1)
+ {
+ throw_or_mimic<argument_incorrect_type>(text);
+ }
+
+ c = text[0];
+ }
+
+ template <typename T>
+ struct type_is_container
+ {
+ static constexpr bool value = false;
+ };
+
+ template <typename T>
+ struct type_is_container<std::vector<T>>
+ {
+ static constexpr bool value = true;
+ };
+
+ template <typename T>
+ class abstract_value : public Value
+ {
+ using Self = abstract_value<T>;
+
+ public:
+ abstract_value()
+ : m_result(std::make_shared<T>())
+ , m_store(m_result.get())
+ {
+ }
+
+ explicit abstract_value(T* t)
+ : m_store(t)
+ {
+ }
+
+ ~abstract_value() override = default;
+
+ abstract_value(const abstract_value& rhs)
+ {
+ if (rhs.m_result)
+ {
+ m_result = std::make_shared<T>();
+ m_store = m_result.get();
+ }
+ else
+ {
+ m_store = rhs.m_store;
+ }
+
+ m_default = rhs.m_default;
+ m_implicit = rhs.m_implicit;
+ m_default_value = rhs.m_default_value;
+ m_implicit_value = rhs.m_implicit_value;
+ }
+
+ void
+ parse(const std::string& text) const override
+ {
+ parse_value(text, *m_store);
+ }
+
+ bool
+ is_container() const override
+ {
+ return type_is_container<T>::value;
+ }
+
+ void
+ parse() const override
+ {
+ parse_value(m_default_value, *m_store);
+ }
+
+ bool
+ has_default() const override
+ {
+ return m_default;
+ }
+
+ bool
+ has_implicit() const override
+ {
+ return m_implicit;
+ }
+
+ std::shared_ptr<Value>
+ default_value(const std::string& value) override
+ {
+ m_default = true;
+ m_default_value = value;
+ return shared_from_this();
+ }
+
+ std::shared_ptr<Value>
+ implicit_value(const std::string& value) override
+ {
+ m_implicit = true;
+ m_implicit_value = value;
+ return shared_from_this();
+ }
+
+ std::shared_ptr<Value>
+ no_implicit_value() override
+ {
+ m_implicit = false;
+ return shared_from_this();
+ }
+
+ std::string
+ get_default_value() const override
+ {
+ return m_default_value;
+ }
+
+ std::string
+ get_implicit_value() const override
+ {
+ return m_implicit_value;
+ }
+
+ bool
+ is_boolean() const override
+ {
+ return std::is_same<T, bool>::value;
+ }
+
+ const T&
+ get() const
+ {
+ if (m_store == nullptr)
+ {
+ return *m_result;
+ }
+ return *m_store;
+ }
+
+ protected:
+ std::shared_ptr<T> m_result;
+ T* m_store;
+
+ bool m_default = false;
+ bool m_implicit = false;
+
+ std::string m_default_value;
+ std::string m_implicit_value;
+ };
+
+ template <typename T>
+ class standard_value : public abstract_value<T>
+ {
+ public:
+ using abstract_value<T>::abstract_value;
+
+ std::shared_ptr<Value>
+ clone() const
+ {
+ return std::make_shared<standard_value<T>>(*this);
+ }
+ };
+
+ template <>
+ class standard_value<bool> : public abstract_value<bool>
+ {
+ public:
+ ~standard_value() override = default;
+
+ standard_value()
+ {
+ set_default_and_implicit();
+ }
+
+ explicit standard_value(bool* b)
+ : abstract_value(b)
+ {
+ set_default_and_implicit();
+ }
+
+ std::shared_ptr<Value>
+ clone() const override
+ {
+ return std::make_shared<standard_value<bool>>(*this);
+ }
+
+ private:
+
+ void
+ set_default_and_implicit()
+ {
+ m_default = true;
+ m_default_value = "false";
+ m_implicit = true;
+ m_implicit_value = "true";
+ }
+ };
+ } // namespace values
+
+ template <typename T>
+ std::shared_ptr<Value>
+ value()
+ {
+ return std::make_shared<values::standard_value<T>>();
+ }
+
+ template <typename T>
+ std::shared_ptr<Value>
+ value(T& t)
+ {
+ return std::make_shared<values::standard_value<T>>(&t);
+ }
+
+ class OptionAdder;
+
+ class OptionDetails
+ {
+ public:
+ OptionDetails
+ (
+ std::string short_,
+ std::string long_,
+ String desc,
+ std::shared_ptr<const Value> val
+ )
+ : m_short(std::move(short_))
+ , m_long(std::move(long_))
+ , m_desc(std::move(desc))
+ , m_value(std::move(val))
+ , m_count(0)
+ {
+ }
+
+ OptionDetails(const OptionDetails& rhs)
+ : m_desc(rhs.m_desc)
+ , m_count(rhs.m_count)
+ {
+ m_value = rhs.m_value->clone();
+ }
+
+ OptionDetails(OptionDetails&& rhs) = default;
+
+ const String&
+ description() const
+ {
+ return m_desc;
+ }
+
+ const Value& value() const {
+ return *m_value;
+ }
+
+ std::shared_ptr<Value>
+ make_storage() const
+ {
+ return m_value->clone();
+ }
+
+ const std::string&
+ short_name() const
+ {
+ return m_short;
+ }
+
+ const std::string&
+ long_name() const
+ {
+ return m_long;
+ }
+
+ private:
+ std::string m_short;
+ std::string m_long;
+ String m_desc;
+ std::shared_ptr<const Value> m_value;
+ int m_count;
+ };
+
+ struct HelpOptionDetails
+ {
+ std::string s;
+ std::string l;
+ String desc;
+ bool has_default;
+ std::string default_value;
+ bool has_implicit;
+ std::string implicit_value;
+ std::string arg_help;
+ bool is_container;
+ bool is_boolean;
+ };
+
+ struct HelpGroupDetails
+ {
+ std::string name;
+ std::string description;
+ std::vector<HelpOptionDetails> options;
+ };
+
+ class OptionValue
+ {
+ public:
+ void
+ parse
+ (
+ const std::shared_ptr<const OptionDetails>& details,
+ const std::string& text
+ )
+ {
+ ensure_value(details);
+ ++m_count;
+ m_value->parse(text);
+ }
+
+ void
+ parse_default(const std::shared_ptr<const OptionDetails>& details)
+ {
+ ensure_value(details);
+ m_default = true;
+ m_value->parse();
+ }
+
+ size_t
+ count() const noexcept
+ {
+ return m_count;
+ }
+
+ // TODO: maybe default options should count towards the number of arguments
+ bool
+ has_default() const noexcept
+ {
+ return m_default;
+ }
+
+ template <typename T>
+ const T&
+ as() const
+ {
+ if (m_value == nullptr) {
+ throw_or_mimic<std::domain_error>("No value");
+ }
+
+#ifdef CXXOPTS_NO_RTTI
+ return static_cast<const values::standard_value<T>&>(*m_value).get();
+#else
+ return dynamic_cast<const values::standard_value<T>&>(*m_value).get();
+#endif
+ }
+
+ private:
+ void
+ ensure_value(const std::shared_ptr<const OptionDetails>& details)
+ {
+ if (m_value == nullptr)
+ {
+ m_value = details->make_storage();
+ }
+ }
+
+ std::shared_ptr<Value> m_value;
+ size_t m_count = 0;
+ bool m_default = false;
+ };
+
+ class KeyValue
+ {
+ public:
+ KeyValue(std::string key_, std::string value_)
+ : m_key(std::move(key_))
+ , m_value(std::move(value_))
+ {
+ }
+
+ const
+ std::string&
+ key() const
+ {
+ return m_key;
+ }
+
+ const
+ std::string&
+ value() const
+ {
+ return m_value;
+ }
+
+ template <typename T>
+ T
+ as() const
+ {
+ T result;
+ values::parse_value(m_value, result);
+ return result;
+ }
+
+ private:
+ std::string m_key;
+ std::string m_value;
+ };
+
+ class ParseResult
+ {
+ public:
+
+ ParseResult(
+ std::shared_ptr<
+ std::unordered_map<std::string, std::shared_ptr<OptionDetails>>
+ >,
+ std::vector<std::string>,
+ bool allow_unrecognised,
+ int&, char**&);
+
+ size_t
+ count(const std::string& o) const
+ {
+ auto iter = m_options->find(o);
+ if (iter == m_options->end())
+ {
+ return 0;
+ }
+
+ auto riter = m_results.find(iter->second);
+
+ return riter->second.count();
+ }
+
+ const OptionValue&
+ operator[](const std::string& option) const
+ {
+ auto iter = m_options->find(option);
+
+ if (iter == m_options->end())
+ {
+ throw_or_mimic<option_not_present_exception>(option);
+ }
+
+ auto riter = m_results.find(iter->second);
+
+ return riter->second;
+ }
+
+ const std::vector<KeyValue>&
+ arguments() const
+ {
+ return m_sequential;
+ }
+
+ private:
+
+ void
+ parse(int& argc, char**& argv);
+
+ void
+ add_to_option(const std::string& option, const std::string& arg);
+
+ bool
+ consume_positional(const std::string& a);
+
+ void
+ parse_option
+ (
+ const std::shared_ptr<OptionDetails>& value,
+ const std::string& name,
+ const std::string& arg = ""
+ );
+
+ void
+ parse_default(const std::shared_ptr<OptionDetails>& details);
+
+ void
+ checked_parse_arg
+ (
+ int argc,
+ char* argv[],
+ int& current,
+ const std::shared_ptr<OptionDetails>& value,
+ const std::string& name
+ );
+
+ const std::shared_ptr<
+ std::unordered_map<std::string, std::shared_ptr<OptionDetails>>
+ > m_options;
+ std::vector<std::string> m_positional;
+ std::vector<std::string>::iterator m_next_positional;
+ std::unordered_set<std::string> m_positional_set;
+ std::unordered_map<std::shared_ptr<OptionDetails>, OptionValue> m_results;
+
+ bool m_allow_unrecognised;
+
+ std::vector<KeyValue> m_sequential;
+ };
+
+ struct Option
+ {
+ Option
+ (
+ std::string opts,
+ std::string desc,
+ std::shared_ptr<const Value> value = ::cxxopts::value<bool>(),
+ std::string arg_help = ""
+ )
+ : opts_(std::move(opts))
+ , desc_(std::move(desc))
+ , value_(std::move(value))
+ , arg_help_(std::move(arg_help))
+ {
+ }
+
+ std::string opts_;
+ std::string desc_;
+ std::shared_ptr<const Value> value_;
+ std::string arg_help_;
+ };
+
+ class Options
+ {
+ using OptionMap = std::unordered_map<std::string, std::shared_ptr<OptionDetails>>;
+ public:
+
+ explicit Options(std::string program, std::string help_string = "")
+ : m_program(std::move(program))
+ , m_help_string(toLocalString(std::move(help_string)))
+ , m_custom_help("[OPTION...]")
+ , m_positional_help("positional parameters")
+ , m_show_positional(false)
+ , m_allow_unrecognised(false)
+ , m_options(std::make_shared<OptionMap>())
+ , m_next_positional(m_positional.end())
+ {
+ }
+
+ Options&
+ positional_help(std::string help_text)
+ {
+ m_positional_help = std::move(help_text);
+ return *this;
+ }
+
+ Options&
+ custom_help(std::string help_text)
+ {
+ m_custom_help = std::move(help_text);
+ return *this;
+ }
+
+ Options&
+ show_positional_help()
+ {
+ m_show_positional = true;
+ return *this;
+ }
+
+ Options&
+ allow_unrecognised_options()
+ {
+ m_allow_unrecognised = true;
+ return *this;
+ }
+
+ ParseResult
+ parse(int& argc, char**& argv);
+
+ OptionAdder
+ add_options(std::string group = "");
+
+ void
+ add_options
+ (
+ const std::string& group,
+ std::initializer_list<Option> options
+ );
+
+ void
+ add_option
+ (
+ const std::string& group,
+ const Option& option
+ );
+
+ void
+ add_option
+ (
+ const std::string& group,
+ const std::string& s,
+ const std::string& l,
+ std::string desc,
+ const std::shared_ptr<const Value>& value,
+ std::string arg_help
+ );
+
+ //parse positional arguments into the given option
+ void
+ parse_positional(std::string option);
+
+ void
+ parse_positional(std::vector<std::string> options);
+
+ void
+ parse_positional(std::initializer_list<std::string> options);
+
+ template <typename Iterator>
+ void
+ parse_positional(Iterator begin, Iterator end) {
+ parse_positional(std::vector<std::string>{begin, end});
+ }
+
+ std::string
+ help(const std::vector<std::string>& groups = {}) const;
+
+ std::vector<std::string>
+ groups() const;
+
+ const HelpGroupDetails&
+ group_help(const std::string& group) const;
+
+ private:
+
+ void
+ add_one_option
+ (
+ const std::string& option,
+ const std::shared_ptr<OptionDetails>& details
+ );
+
+ String
+ help_one_group(const std::string& group) const;
+
+ void
+ generate_group_help
+ (
+ String& result,
+ const std::vector<std::string>& groups
+ ) const;
+
+ void
+ generate_all_groups_help(String& result) const;
+
+ std::string m_program;
+ String m_help_string;
+ std::string m_custom_help;
+ std::string m_positional_help;
+ bool m_show_positional;
+ bool m_allow_unrecognised;
+
+ std::shared_ptr<OptionMap> m_options;
+ std::vector<std::string> m_positional;
+ std::vector<std::string>::iterator m_next_positional;
+ std::unordered_set<std::string> m_positional_set;
+
+ //mapping from groups to help options
+ std::map<std::string, HelpGroupDetails> m_help;
+ };
+
+ class OptionAdder
+ {
+ public:
+
+ OptionAdder(Options& options, std::string group)
+ : m_options(options), m_group(std::move(group))
+ {
+ }
+
+ OptionAdder&
+ operator()
+ (
+ const std::string& opts,
+ const std::string& desc,
+ const std::shared_ptr<const Value>& value
+ = ::cxxopts::value<bool>(),
+ std::string arg_help = ""
+ );
+
+ private:
+ Options& m_options;
+ std::string m_group;
+ };
+
+ namespace
+ {
+ constexpr int OPTION_LONGEST = 30;
+ constexpr int OPTION_DESC_GAP = 2;
+
+ std::basic_regex<char> option_matcher
+ ("--([[:alnum:]][-_[:alnum:]]+)(=(.*))?|-([[:alnum:]]+)");
+
+ std::basic_regex<char> option_specifier
+ ("(([[:alnum:]]),)?[ ]*([[:alnum:]][-_[:alnum:]]*)?");
+
+ String
+ format_option
+ (
+ const HelpOptionDetails& o
+ )
+ {
+ const auto& s = o.s;
+ const auto& l = o.l;
+
+ String result = " ";
+
+ if (!s.empty())
+ {
+ result += "-" + toLocalString(s);
+ if (!l.empty())
+ {
+ result += ",";
+ }
+ }
+ else
+ {
+ result += " ";
+ }
+
+ if (!l.empty())
+ {
+ result += " --" + toLocalString(l);
+ }
+
+ auto arg = !o.arg_help.empty() ? toLocalString(o.arg_help) : "arg";
+
+ if (!o.is_boolean)
+ {
+ if (o.has_implicit)
+ {
+ result += " [=" + arg + "(=" + toLocalString(o.implicit_value) + ")]";
+ }
+ else
+ {
+ result += " " + arg;
+ }
+ }
+
+ return result;
+ }
+
+ String
+ format_description
+ (
+ const HelpOptionDetails& o,
+ size_t start,
+ size_t width
+ )
+ {
+ auto desc = o.desc;
+
+ if (o.has_default && (!o.is_boolean || o.default_value != "false"))
+ {
+ if(!o.default_value.empty())
+ {
+ desc += toLocalString(" (default: " + o.default_value + ")");
+ }
+ else
+ {
+ desc += toLocalString(" (default: \"\")");
+ }
+ }
+
+ String result;
+
+ auto current = std::begin(desc);
+ auto startLine = current;
+ auto lastSpace = current;
+
+ auto size = size_t{};
+
+ while (current != std::end(desc))
+ {
+ if (*current == ' ')
+ {
+ lastSpace = current;
+ }
+
+ if (*current == '\n')
+ {
+ startLine = current + 1;
+ lastSpace = startLine;
+ }
+ else if (size > width)
+ {
+ if (lastSpace == startLine)
+ {
+ stringAppend(result, startLine, current + 1);
+ stringAppend(result, "\n");
+ stringAppend(result, start, ' ');
+ startLine = current + 1;
+ lastSpace = startLine;
+ }
+ else
+ {
+ stringAppend(result, startLine, lastSpace);
+ stringAppend(result, "\n");
+ stringAppend(result, start, ' ');
+ startLine = lastSpace + 1;
+ lastSpace = startLine;
+ }
+ size = 0;
+ }
+ else
+ {
+ ++size;
+ }
+
+ ++current;
+ }
+
+ //append whatever is left
+ stringAppend(result, startLine, current);
+
+ return result;
+ }
+ } // namespace
+
+inline
+ParseResult::ParseResult
+(
+ std::shared_ptr<
+ std::unordered_map<std::string, std::shared_ptr<OptionDetails>>
+ > options,
+ std::vector<std::string> positional,
+ bool allow_unrecognised,
+ int& argc, char**& argv
+)
+: m_options(std::move(options))
+, m_positional(std::move(positional))
+, m_next_positional(m_positional.begin())
+, m_allow_unrecognised(allow_unrecognised)
+{
+ parse(argc, argv);
+}
+
+inline
+void
+Options::add_options
+(
+ const std::string &group,
+ std::initializer_list<Option> options
+)
+{
+ OptionAdder option_adder(*this, group);
+ for (const auto &option: options)
+ {
+ option_adder(option.opts_, option.desc_, option.value_, option.arg_help_);
+ }
+}
+
+inline
+OptionAdder
+Options::add_options(std::string group)
+{
+ return OptionAdder(*this, std::move(group));
+}
+
+inline
+OptionAdder&
+OptionAdder::operator()
+(
+ const std::string& opts,
+ const std::string& desc,
+ const std::shared_ptr<const Value>& value,
+ std::string arg_help
+)
+{
+ std::match_results<const char*> result;
+ std::regex_match(opts.c_str(), result, option_specifier);
+
+ if (result.empty())
+ {
+ throw_or_mimic<invalid_option_format_error>(opts);
+ }
+
+ const auto& short_match = result[2];
+ const auto& long_match = result[3];
+
+ if (!short_match.length() && !long_match.length())
+ {
+ throw_or_mimic<invalid_option_format_error>(opts);
+ } else if (long_match.length() == 1 && short_match.length())
+ {
+ throw_or_mimic<invalid_option_format_error>(opts);
+ }
+
+ auto option_names = []
+ (
+ const std::sub_match<const char*>& short_,
+ const std::sub_match<const char*>& long_
+ )
+ {
+ if (long_.length() == 1)
+ {
+ return std::make_tuple(long_.str(), short_.str());
+ }
+ return std::make_tuple(short_.str(), long_.str());
+ }(short_match, long_match);
+
+ m_options.add_option
+ (
+ m_group,
+ std::get<0>(option_names),
+ std::get<1>(option_names),
+ desc,
+ value,
+ std::move(arg_help)
+ );
+
+ return *this;
+}
+
+inline
+void
+ParseResult::parse_default(const std::shared_ptr<OptionDetails>& details)
+{
+ m_results[details].parse_default(details);
+}
+
+inline
+void
+ParseResult::parse_option
+(
+ const std::shared_ptr<OptionDetails>& value,
+ const std::string& /*name*/,
+ const std::string& arg
+)
+{
+ auto& result = m_results[value];
+ result.parse(value, arg);
+
+ m_sequential.emplace_back(value->long_name(), arg);
+}
+
+inline
+void
+ParseResult::checked_parse_arg
+(
+ int argc,
+ char* argv[],
+ int& current,
+ const std::shared_ptr<OptionDetails>& value,
+ const std::string& name
+)
+{
+ if (current + 1 >= argc)
+ {
+ if (value->value().has_implicit())
+ {
+ parse_option(value, name, value->value().get_implicit_value());
+ }
+ else
+ {
+ throw_or_mimic<missing_argument_exception>(name);
+ }
+ }
+ else
+ {
+ if (value->value().has_implicit())
+ {
+ parse_option(value, name, value->value().get_implicit_value());
+ }
+ else
+ {
+ parse_option(value, name, argv[current + 1]);
+ ++current;
+ }
+ }
+}
+
+inline
+void
+ParseResult::add_to_option(const std::string& option, const std::string& arg)
+{
+ auto iter = m_options->find(option);
+
+ if (iter == m_options->end())
+ {
+ throw_or_mimic<option_not_exists_exception>(option);
+ }
+
+ parse_option(iter->second, option, arg);
+}
+
+inline
+bool
+ParseResult::consume_positional(const std::string& a)
+{
+ while (m_next_positional != m_positional.end())
+ {
+ auto iter = m_options->find(*m_next_positional);
+ if (iter != m_options->end())
+ {
+ auto& result = m_results[iter->second];
+ if (!iter->second->value().is_container())
+ {
+ if (result.count() == 0)
+ {
+ add_to_option(*m_next_positional, a);
+ ++m_next_positional;
+ return true;
+ }
+ ++m_next_positional;
+ continue;
+ }
+ add_to_option(*m_next_positional, a);
+ return true;
+ }
+ throw_or_mimic<option_not_exists_exception>(*m_next_positional);
+ }
+
+ return false;
+}
+
+inline
+void
+Options::parse_positional(std::string option)
+{
+ parse_positional(std::vector<std::string>{std::move(option)});
+}
+
+inline
+void
+Options::parse_positional(std::vector<std::string> options)
+{
+ m_positional = std::move(options);
+ m_next_positional = m_positional.begin();
+
+ m_positional_set.insert(m_positional.begin(), m_positional.end());
+}
+
+inline
+void
+Options::parse_positional(std::initializer_list<std::string> options)
+{
+ parse_positional(std::vector<std::string>(options));
+}
+
+inline
+ParseResult
+Options::parse(int& argc, char**& argv)
+{
+ ParseResult result(m_options, m_positional, m_allow_unrecognised, argc, argv);
+ return result;
+}
+
+inline
+void
+ParseResult::parse(int& argc, char**& argv)
+{
+ int current = 1;
+
+ int nextKeep = 1;
+
+ bool consume_remaining = false;
+
+ while (current != argc)
+ {
+ if (strcmp(argv[current], "--") == 0)
+ {
+ consume_remaining = true;
+ ++current;
+ break;
+ }
+
+ std::match_results<const char*> result;
+ std::regex_match(argv[current], result, option_matcher);
+
+ if (result.empty())
+ {
+ //not a flag
+
+ // but if it starts with a `-`, then it's an error
+ if (argv[current][0] == '-' && argv[current][1] != '\0') {
+ if (!m_allow_unrecognised) {
+ throw_or_mimic<option_syntax_exception>(argv[current]);
+ }
+ }
+
+ //if true is returned here then it was consumed, otherwise it is
+ //ignored
+ if (consume_positional(argv[current]))
+ {
+ }
+ else
+ {
+ argv[nextKeep] = argv[current];
+ ++nextKeep;
+ }
+ //if we return from here then it was parsed successfully, so continue
+ }
+ else
+ {
+ //short or long option?
+ if (result[4].length() != 0)
+ {
+ const std::string& s = result[4];
+
+ for (std::size_t i = 0; i != s.size(); ++i)
+ {
+ std::string name(1, s[i]);
+ auto iter = m_options->find(name);
+
+ if (iter == m_options->end())
+ {
+ if (m_allow_unrecognised)
+ {
+ continue;
+ }
+ //error
+ throw_or_mimic<option_not_exists_exception>(name);
+ }
+
+ auto value = iter->second;
+
+ if (i + 1 == s.size())
+ {
+ //it must be the last argument
+ checked_parse_arg(argc, argv, current, value, name);
+ }
+ else if (value->value().has_implicit())
+ {
+ parse_option(value, name, value->value().get_implicit_value());
+ }
+ else
+ {
+ //error
+ throw_or_mimic<option_requires_argument_exception>(name);
+ }
+ }
+ }
+ else if (result[1].length() != 0)
+ {
+ const std::string& name = result[1];
+
+ auto iter = m_options->find(name);
+
+ if (iter == m_options->end())
+ {
+ if (m_allow_unrecognised)
+ {
+ // keep unrecognised options in argument list, skip to next argument
+ argv[nextKeep] = argv[current];
+ ++nextKeep;
+ ++current;
+ continue;
+ }
+ //error
+ throw_or_mimic<option_not_exists_exception>(name);
+ }
+
+ auto opt = iter->second;
+
+ //equals provided for long option?
+ if (result[2].length() != 0)
+ {
+ //parse the option given
+
+ parse_option(opt, name, result[3]);
+ }
+ else
+ {
+ //parse the next argument
+ checked_parse_arg(argc, argv, current, opt, name);
+ }
+ }
+
+ }
+
+ ++current;
+ }
+
+ for (auto& opt : *m_options)
+ {
+ auto& detail = opt.second;
+ const auto& value = detail->value();
+
+ auto& store = m_results[detail];
+
+ if(value.has_default() && !store.count() && !store.has_default()){
+ parse_default(detail);
+ }
+ }
+
+ if (consume_remaining)
+ {
+ while (current < argc)
+ {
+ if (!consume_positional(argv[current])) {
+ break;
+ }
+ ++current;
+ }
+
+ //adjust argv for any that couldn't be swallowed
+ while (current != argc) {
+ argv[nextKeep] = argv[current];
+ ++nextKeep;
+ ++current;
+ }
+ }
+
+ argc = nextKeep;
+
+}
+
+inline
+void
+Options::add_option
+(
+ const std::string& group,
+ const Option& option
+)
+{
+ add_options(group, {option});
+}
+
+inline
+void
+Options::add_option
+(
+ const std::string& group,
+ const std::string& s,
+ const std::string& l,
+ std::string desc,
+ const std::shared_ptr<const Value>& value,
+ std::string arg_help
+)
+{
+ auto stringDesc = toLocalString(std::move(desc));
+ auto option = std::make_shared<OptionDetails>(s, l, stringDesc, value);
+
+ if (!s.empty())
+ {
+ add_one_option(s, option);
+ }
+
+ if (!l.empty())
+ {
+ add_one_option(l, option);
+ }
+
+ //add the help details
+ auto& options = m_help[group];
+
+ options.options.emplace_back(HelpOptionDetails{s, l, stringDesc,
+ value->has_default(), value->get_default_value(),
+ value->has_implicit(), value->get_implicit_value(),
+ std::move(arg_help),
+ value->is_container(),
+ value->is_boolean()});
+}
+
+inline
+void
+Options::add_one_option
+(
+ const std::string& option,
+ const std::shared_ptr<OptionDetails>& details
+)
+{
+ auto in = m_options->emplace(option, details);
+
+ if (!in.second)
+ {
+ throw_or_mimic<option_exists_error>(option);
+ }
+}
+
+inline
+String
+Options::help_one_group(const std::string& g) const
+{
+ using OptionHelp = std::vector<std::pair<String, String>>;
+
+ auto group = m_help.find(g);
+ if (group == m_help.end())
+ {
+ return "";
+ }
+
+ OptionHelp format;
+
+ size_t longest = 0;
+
+ String result;
+
+ if (!g.empty())
+ {
+ result += toLocalString(" " + g + " options:\n");
+ }
+
+ for (const auto& o : group->second.options)
+ {
+ if (m_positional_set.find(o.l) != m_positional_set.end() &&
+ !m_show_positional)
+ {
+ continue;
+ }
+
+ auto s = format_option(o);
+ longest = (std::max)(longest, stringLength(s));
+ format.push_back(std::make_pair(s, String()));
+ }
+
+ longest = (std::min)(longest, static_cast<size_t>(OPTION_LONGEST));
+
+ //widest allowed description
+ auto allowed = size_t{76} - longest - OPTION_DESC_GAP;
+
+ auto fiter = format.begin();
+ for (const auto& o : group->second.options)
+ {
+ if (m_positional_set.find(o.l) != m_positional_set.end() &&
+ !m_show_positional)
+ {
+ continue;
+ }
+
+ auto d = format_description(o, longest + OPTION_DESC_GAP, allowed);
+
+ result += fiter->first;
+ if (stringLength(fiter->first) > longest)
+ {
+ result += '\n';
+ result += toLocalString(std::string(longest + OPTION_DESC_GAP, ' '));
+ }
+ else
+ {
+ result += toLocalString(std::string(longest + OPTION_DESC_GAP -
+ stringLength(fiter->first),
+ ' '));
+ }
+ result += d;
+ result += '\n';
+
+ ++fiter;
+ }
+
+ return result;
+}
+
+inline
+void
+Options::generate_group_help
+(
+ String& result,
+ const std::vector<std::string>& print_groups
+) const
+{
+ for (size_t i = 0; i != print_groups.size(); ++i)
+ {
+ const String& group_help_text = help_one_group(print_groups[i]);
+ if (empty(group_help_text))
+ {
+ continue;
+ }
+ result += group_help_text;
+ if (i < print_groups.size() - 1)
+ {
+ result += '\n';
+ }
+ }
+}
+
+inline
+void
+Options::generate_all_groups_help(String& result) const
+{
+ std::vector<std::string> all_groups;
+ all_groups.reserve(m_help.size());
+
+ for (const auto& group : m_help)
+ {
+ all_groups.push_back(group.first);
+ }
+
+ generate_group_help(result, all_groups);
+}
+
+inline
+std::string
+Options::help(const std::vector<std::string>& help_groups) const
+{
+ String result = m_help_string + "\nUsage:\n " +
+ toLocalString(m_program) + " " + toLocalString(m_custom_help);
+
+ if (!m_positional.empty() && !m_positional_help.empty()) {
+ result += " " + toLocalString(m_positional_help);
+ }
+
+ result += "\n\n";
+
+ if (help_groups.empty())
+ {
+ generate_all_groups_help(result);
+ }
+ else
+ {
+ generate_group_help(result, help_groups);
+ }
+
+ return toUTF8String(result);
+}
+
+inline
+std::vector<std::string>
+Options::groups() const
+{
+ std::vector<std::string> g;
+
+ std::transform(
+ m_help.begin(),
+ m_help.end(),
+ std::back_inserter(g),
+ [] (const std::map<std::string, HelpGroupDetails>::value_type& pair)
+ {
+ return pair.first;
+ }
+ );
+
+ return g;
+}
+
+inline
+const HelpGroupDetails&
+Options::group_help(const std::string& group) const
+{
+ return m_help.at(group);
+}
+
+} // namespace cxxopts
+
+#endif //CXXOPTS_HPP_INCLUDED