libcruft-util/cmdopt.ipp

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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>
*/
#ifdef __UTIL_CMDLINE_IPP
#error
#endif
#define __UTIL_CMDLINE_IPP
#include <sstream>
#include "./introspection.hpp"
#include "./iterator.hpp"
namespace util { namespace cmdopt {
///////////////////////////////////////////////////////////////////////////
template <typename T>
option::value<T>::value (T &_data):
m_data (_data)
{ ; }
//-------------------------------------------------------------------------
template <typename T>
void
option::value<T>::execute (const char *restrict str)
{
try {
std::istringstream os (str);
os.exceptions (
std::istringstream::failbit
| std::istringstream::badbit
);
os >> m_data;
if (!os.eof ())
throw invalid_value (__func__);
} catch (...) {
throw invalid_value (__func__);
}
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seen (true);
}
//-------------------------------------------------------------------------
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>
const std::string&
option::value<T>::example (void) const
{
return detail::value_example<T> ();
}
//-----------------------------------------------------------------------------
template <typename T>
const T&
option::value<T>::data (void) const&
{
return m_data;
}
//-----------------------------------------------------------------------------
template <typename T>
T&
option::value<T>::data (void) &
{
return m_data;
}
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//-----------------------------------------------------------------------------
template <typename T>
T&
option::value<T>::data (T _data) &
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{
return m_data = _data;
}
///////////////////////////////////////////////////////////////////////////
template <typename T, typename ...Args>
T&
parser::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.emplace_back (shortname, ref);
m_long .emplace_back (std::move (longname), ref);
m_options.emplace_back (std::move (description), std::move (handler));
return ref;
}
//-------------------------------------------------------------------------
template <typename T, typename ...Args>
T&
parser::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.emplace_back (std::move (description), std::move (handler));
return ref;
}
} }