mirror of
https://github.com/matrix-construct/construct
synced 2024-11-05 13:28:54 +01:00
116 lines
2.5 KiB
C++
116 lines
2.5 KiB
C++
// Matrix Construct
|
|
//
|
|
// Copyright (C) Matrix Construct Developers, Authors & Contributors
|
|
// Copyright (C) 2016-2019 Jason Volk <jason@zemos.net>
|
|
//
|
|
// Permission to use, copy, modify, and/or distribute this software for any
|
|
// purpose with or without fee is hereby granted, provided that the above
|
|
// copyright notice and this permission notice is present in all copies. The
|
|
// full license for this software is available in the LICENSE file.
|
|
|
|
#pragma once
|
|
#define HAVE_IRCD_JSON_TUPLE_TOOL_H
|
|
|
|
namespace ircd {
|
|
namespace json {
|
|
|
|
template<class... T>
|
|
size_t
|
|
serialized(const tuple<T...> &t)
|
|
{
|
|
constexpr const size_t member_count
|
|
{
|
|
tuple<T...>::size()
|
|
};
|
|
|
|
std::array<size_t, member_count> sizes {0};
|
|
const auto e{_member_transform_if(t, begin(sizes), end(sizes), []
|
|
(auto &ret, const string_view &key, auto&& val)
|
|
{
|
|
const json::value value(val);
|
|
if(!defined(value))
|
|
return false;
|
|
|
|
ret = 1 + key.size() + 1 + 1 + serialized(value) + 1;
|
|
return true;
|
|
})};
|
|
|
|
// Subtract one to get the final size when an extra comma is
|
|
// accumulated on non-empty objects.
|
|
const auto overhead
|
|
{
|
|
1 + std::all_of(begin(sizes), e, is_zero{})
|
|
};
|
|
|
|
return std::accumulate(begin(sizes), e, size_t(overhead));
|
|
}
|
|
|
|
template<class... T>
|
|
inline size_t
|
|
serialized(const tuple<T...> *const &b,
|
|
const tuple<T...> *const &e)
|
|
{
|
|
size_t ret(1 + (b == e));
|
|
return std::accumulate(b, e, ret, []
|
|
(size_t ret, const tuple<T...> &t)
|
|
{
|
|
return ret += serialized(t) + 1;
|
|
});
|
|
}
|
|
|
|
template<class... T>
|
|
string_view
|
|
stringify(mutable_buffer &buf,
|
|
const tuple<T...> &tuple)
|
|
{
|
|
static constexpr const size_t member_count
|
|
{
|
|
json::tuple_size<json::tuple<T...>>()
|
|
};
|
|
|
|
std::array<member, member_count> members;
|
|
const auto e{_member_transform_if(tuple, begin(members), end(members), []
|
|
(auto &ret, const string_view &key, auto&& val)
|
|
{
|
|
json::value value(val);
|
|
if(!defined(value))
|
|
return false;
|
|
|
|
ret = member { key, std::move(value) };
|
|
return true;
|
|
})};
|
|
|
|
return stringify(buf, begin(members), e);
|
|
}
|
|
|
|
template<class... T>
|
|
inline string_view
|
|
stringify(mutable_buffer &buf,
|
|
const tuple<T...> *b,
|
|
const tuple<T...> *const &e)
|
|
{
|
|
const auto start(begin(buf));
|
|
consume(buf, copy(buf, '['));
|
|
if(b != e)
|
|
{
|
|
stringify(buf, *b);
|
|
for(++b; b != e; ++b)
|
|
{
|
|
consume(buf, copy(buf, ','));
|
|
stringify(buf, *b);
|
|
}
|
|
}
|
|
consume(buf, copy(buf, ']'));
|
|
return { start, begin(buf) };
|
|
}
|
|
|
|
template<class... T>
|
|
inline std::ostream &
|
|
operator<<(std::ostream &s, const tuple<T...> &t)
|
|
{
|
|
s << json::strung(t);
|
|
return s;
|
|
}
|
|
|
|
} // namespace json
|
|
} // namespace ircd
|