libcruft-util/cmdopt.hpp

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/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright 2013-2016 Danny Robson <danny@nerdcruft.net>
*/
#ifndef __UTIL_CMDLINE_HPP
#define __UTIL_CMDLINE_HPP
#include <functional>
#include <memory>
#include <exception>
#include <string>
#include <tuple>
#include <vector>
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///////////////////////////////////////////////////////////////////////////////
namespace util::cmdopt {
namespace option {
class base {
public:
// we deal almost exclusively with vtables, so disable copying
// just in case we do something stupid.
base () { }
base (const base&) = delete;
base& operator= (const base&) = delete;
virtual ~base ();
virtual void execute (void);
virtual void execute (const char *restrict);
virtual void start (void);
virtual void finish (void);
virtual const std::string& example (void) const = 0;
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bool required (void) const;
bool required (bool);
bool seen (void) const;
bool seen (bool);
private:
bool m_required = false;
bool m_seen = false;
};
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class null : public base {
public:
virtual void execute (void) override;
virtual void execute (const char *restrict) override;
virtual const std::string& example (void) const override;
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};
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class present : public base {
public:
explicit present (bool&);
explicit present (bool&&) = delete;
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using base::execute;
virtual void execute (void) override;
virtual const std::string& example (void) const override;
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virtual void finish (void) override;
private:
bool &m_data;
};
template <typename T>
class value : public base {
public:
explicit value (T&);
explicit value (T&&) = delete;
using base::execute;
void execute (const char *restrict) override;
const std::string& example (void) const override;
const T& data (void) const&;
T& data (void) &;
T& data (T) &;
private:
T& m_data;
};
template <typename T = unsigned>
class count : public value<T> {
public:
explicit count (T&);
explicit count (T&&) = delete;
using value<T>::execute;
void execute (void) override;
};
class bytes : public value<size_t> {
public:
bytes (size_t &_value): value (_value) { }
using value<size_t>::execute;
void execute (const char *restrict) override;
};
}
class parser {
public:
template <typename T, typename ...Args>
T& add (char shortname,
std::string longname,
std::string description,
Args&&...);
template <typename T, typename ...Args>
T&
append (std::string description, Args&&...);
int scan (int argc, const char *const *argv);
private:
int parse_long (int pos, int argc, const char *const *argv);
int parse_short (int pos, int argc, const char *const *argv);
void print_help [[noreturn]] (int argc, const char *const *argv) const;
using short_t = std::tuple<char,option::base&>;
using long_t = std::tuple<std::string,option::base&>;
std::vector<short_t> m_short;
std::vector<long_t> m_long;
std::vector<std::reference_wrapper<option::base>> m_positional;
std::vector<
std::tuple<
std::string, // description
std::unique_ptr<option::base>
>
> m_options;
};
class error : public std::exception { };
class invalid_key : public error {
public:
invalid_key (std::string _key);
virtual const char* what (void) const noexcept override;
private:
const std::string m_key;
};
class invalid_value : public error {
public:
invalid_value (std::string _value);
virtual const char* what (void) const noexcept override;
private:
const std::string m_value;
};
class invalid_null : public error {
public:
virtual const char* what (void) const noexcept override;
};
class invalid_required : public error {
public:
virtual const char* what (void) const noexcept override;
};
class unhandled_argument : public error {
public:
unhandled_argument (int index);
virtual const char* what (void) const noexcept override;
int index (void) const noexcept;
private:
const int m_index;
};
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}
#include "cmdopt.ipp"
#endif