libcruft-util/cmdopt.hpp

336 lines
9.2 KiB
C++
Raw Normal View History

/*
* 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 CRUFT_UTIL_CMDLINE_HPP
#define CRUFT_UTIL_CMDLINE_HPP
#include "introspection.hpp"
#include "iterator.hpp"
#include <exception>
#include <functional>
#include <memory>
#include <string>
#include <tuple>
#include <vector>
#include <map>
#include <sstream>
2017-01-05 15:06:49 +11:00
///////////////////////////////////////////////////////////////////////////////
namespace util::cmdopt {
///////////////////////////////////////////////////////////////////////////
class error : public std::exception { };
//-------------------------------------------------------------------------
class invalid_key : public error {
public:
explicit invalid_key (std::string _key);
const char* what (void) const noexcept override;
private:
const std::string m_key;
};
//-------------------------------------------------------------------------
class invalid_value : public error {
public:
explicit invalid_value (std::string _value);
const char* what (void) const noexcept override;
private:
const std::string m_value;
};
//-------------------------------------------------------------------------
class invalid_null : public error {
public:
const char* what (void) const noexcept override;
};
//-------------------------------------------------------------------------
class invalid_required : public error {
public:
const char* what (void) const noexcept override;
};
//-------------------------------------------------------------------------
class unhandled_argument : public error {
public:
explicit unhandled_argument (int index);
const char* what (void) const noexcept override;
int index (void) const noexcept;
private:
const int m_index;
};
///////////////////////////////////////////////////////////////////////////
namespace option {
class base {
public:
// we deal almost exclusively with vtables, so disable copying
// just in case we do something stupid.
base () = default;
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;
2015-06-30 22:04:54 +10:00
bool required (void) const;
bool required (bool);
bool seen (void) const;
bool seen (bool);
private:
bool m_required = false;
bool m_seen = false;
};
2015-06-30 22:06:10 +10:00
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;
2015-06-30 22:06:10 +10:00
};
2015-06-30 22:07:02 +10:00
class present : public base {
public:
explicit present (bool&);
explicit present (bool&&) = delete;
2015-06-30 22:07:02 +10:00
using base::execute;
virtual void execute (void) override;
virtual const std::string& example (void) const override;
2015-06-30 22:07:02 +10:00
virtual void finish (void) override;
private:
bool &m_data;
};
namespace detail {
template <typename T>
std::enable_if_t<!std::is_enum<T>::value, const std::string&>
value_example (void)
{
static const std::string EXAMPLE =
std::string {"<"} +
std::string {to_string<T> ()} +
std::string {">"};
return EXAMPLE;
}
template <typename T>
std::enable_if_t<std::is_enum<T>::value, const std::string&>
value_example (void)
{
static const std::string EXAMPLE = [] (void) {
std::ostringstream os;
std::copy (std::cbegin (enum_traits<T>::names),
std::cend (enum_traits<T>::names),
infix_iterator<const char*> (os, "|"));
return os.str ();
} ();
return EXAMPLE;
}
}
template <typename T>
class value : public base {
public:
explicit value (T &_data): m_data (_data) { }
explicit value (T&&) = delete;
using base::execute;
void execute (const char *restrict str) override
{
try {
std::istringstream is (str);
is.exceptions (
std::istringstream::failbit
| std::istringstream::badbit
);
is >> m_data;
} catch (...) {
throw invalid_value (__func__);
}
seen (true);
}
const std::string& example (void) const override
{
return detail::value_example<T> ();
}
const T& data (void) const&
{
return m_data;
}
T& data (void) &
{
return m_data;
}
T& data (T _data) &
{
return m_data = _data;
}
private:
T& m_data;
};
template <>
inline void
value<bool>::execute (const char *restrict str)
{
static const std::string TRUE_STRING[] = {
"true",
"yes",
"y",
"1"
};
if (std::any_of (std::begin (TRUE_STRING),
std::end (TRUE_STRING),
[str] (auto i) { return i == str; }))
{
m_data = true;
return;
}
static const std::string FALSE_STRING[] = {
"false",
"no",
"n",
"0"
};
if (std::any_of (std::begin (FALSE_STRING),
std::end (FALSE_STRING),
[str] (auto i) { return i == str; }))
{
m_data = false;
return;
}
base::execute (str);
seen (true);
}
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:
2017-05-23 12:50:51 +10:00
explicit 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&&... args)
{
auto handler = std::make_unique<T> (std::forward<Args> (args)...);
T& ref = *handler;
m_short.insert({ shortname, ref });
m_long.insert({ std::move (longname), ref });
m_options.push_back ({ std::move (description), std::move (handler) });
return ref;
}
template <typename T, typename ...Args>
T&
append (std::string description, Args&&...args)
{
auto handler = std::make_unique<T> (std::forward<Args> (args)...);
auto &ref = *handler;
m_positional.push_back (ref);
m_options.push_back ({ std::move (description), std::move (handler) });
return ref;
}
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;
std::map<char,std::reference_wrapper<option::base>> m_short;
std::map<std::string,std::reference_wrapper<option::base>> m_long;
std::vector<std::reference_wrapper<option::base>> m_positional;
struct entry {
std::string description;
std::unique_ptr<option::base> handler;
};
std::vector<entry> m_options;
};
2017-01-05 15:06:49 +11:00
}
#endif