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/*
* Copyright (c) 2014, Andrzej Rybczak <electricityispower@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef NCMPCPP_UTILITY_OPTION_PARSER_H
#define NCMPCPP_UTILITY_OPTION_PARSER_H
#include <boost/lexical_cast.hpp>
#include <cassert>
#include <stdexcept>
#include <unordered_map>
#include "utility/functional.h"
struct option_parser
{
typedef std::function<void(std::string &&)> parser_t;
typedef std::function<void()> default_t;
template <typename DestT, typename SourceT>
struct assign_value_once
{
typedef DestT dest_type;
typedef typename std::decay<SourceT>::type source_type;
template <typename ArgT>
assign_value_once(DestT &dest, ArgT &&value)
: m_dest(dest), m_source(std::make_shared<source_type>(std::forward<ArgT>(value))) { }
void operator()()
{
assert(m_source.get() != nullptr);
m_dest = std::move(*m_source);
m_source.reset();
}
private:
DestT &m_dest;
std::shared_ptr<source_type> m_source;
};
template <typename IntermediateT, typename DestT, typename TransformT>
struct parse_and_transform
{
template <typename ArgT>
parse_and_transform(DestT &dest, ArgT &&map)
: m_dest(dest), m_map(std::forward<ArgT>(map)) { }
void operator()(std::string &&v)
{
try {
m_dest = m_map(boost::lexical_cast<IntermediateT>(v));
} catch (boost::bad_lexical_cast &) {
throw std::runtime_error("invalid value: " + v);
}
}
private:
DestT &m_dest;
TransformT m_map;
};
struct worker
{
worker() { }
template <typename ParserT, typename DefaultT>
worker(ParserT &&p, DefaultT &&d)
: m_defined(false), m_parser(std::forward<ParserT>(p))
, m_default(std::forward<DefaultT>(d)) { }
template <typename ValueT>
void parse(ValueT &&value)
{
if (m_defined)
throw std::runtime_error("option already defined");
m_parser(std::forward<ValueT>(value));
m_defined = true;
}
bool defined() const { return m_defined; }
void run_default() const { m_default(); }
private:
bool m_defined;
parser_t m_parser;
default_t m_default;
};
template <typename ParserT, typename DefaultT>
void add(const std::string &option, ParserT &&p, DefaultT &&d)
{
assert(m_parsers.count(option) == 0);
m_parsers[option] = worker(std::forward<ParserT>(p), std::forward<DefaultT>(d));
}
template <typename WorkerT>
void add(const std::string &option, WorkerT &&w)
{
assert(m_parsers.count(option) == 0);
m_parsers[option] = std::forward<WorkerT>(w);
}
bool run(std::istream &is);
private:
std::unordered_map<std::string, worker> m_parsers;
};
template <typename IntermediateT, typename ArgT, typename TransformT>
option_parser::parser_t assign(ArgT &arg, TransformT &&map = id_())
{
return option_parser::parse_and_transform<IntermediateT, ArgT, TransformT>(
arg, std::forward<TransformT>(map)
);
}
template <typename ArgT, typename ValueT>
option_parser::default_t defaults_to(ArgT &arg, ValueT &&value)
{
return option_parser::assign_value_once<ArgT, ValueT>(
arg, std::forward<ValueT>(value)
);
}
template <typename IntermediateT, typename ArgT, typename ValueT, typename TransformT>
option_parser::worker assign_default(ArgT &arg, ValueT &&value, TransformT &&map)
{
return option_parser::worker(
assign<IntermediateT>(arg, std::forward<TransformT>(map)),
defaults_to(arg, map(std::forward<ValueT>(value)))
);
}
template <typename ArgT, typename ValueT>
option_parser::worker assign_default(ArgT &arg, ValueT &&value)
{
return assign_default<ArgT>(arg, std::forward<ValueT>(value), id_());
}
// workers for specific types
option_parser::worker yes_no(bool &arg, bool value);
#endif // NCMPCPP_UTILITY_OPTION_PARSER_H
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