mirror of
https://github.com/matrix-construct/construct
synced 2024-06-02 18:18:56 +02:00
117 lines
2.5 KiB
C++
117 lines
2.5 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2019 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_JSON_TUPLE_TOOL_H
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namespace ircd {
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namespace json {
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template<class... T>
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size_t
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serialized(const tuple<T...> &t)
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{
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constexpr const size_t member_count
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{
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tuple<T...>::size()
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};
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std::array<size_t, member_count> sizes {0};
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const auto e{_member_transform_if(t, begin(sizes), end(sizes), []
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(auto &ret, const string_view &key, auto&& val)
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{
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const json::value value(val);
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if(!defined(value))
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return false;
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ret = 1 + key.size() + 1 + 1 + serialized(value) + 1;
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return true;
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})};
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// Subtract one to get the final size when an extra comma is
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// accumulated on non-empty objects.
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const auto overhead
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{
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1 + std::all_of(begin(sizes), e, is_zero{})
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};
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return std::accumulate(begin(sizes), e, size_t(overhead));
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}
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template<class... T>
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inline size_t
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serialized(const tuple<T...> *const &b,
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const tuple<T...> *const &e)
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{
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size_t ret(1 + (b == e));
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return std::accumulate(b, e, ret, []
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(size_t ret, const tuple<T...> &t)
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{
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return ret += serialized(t) + 1;
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});
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}
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template<class... T>
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string_view
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stringify(mutable_buffer &buf,
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const tuple<T...> &tuple)
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{
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static constexpr const size_t member_count
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{
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json::tuple_size<json::tuple<T...>>()
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};
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std::array<member, member_count> members;
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const auto e{_member_transform_if(tuple, begin(members), end(members), []
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(auto &ret, const string_view &key, auto&& val)
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{
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json::value value(val);
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if(!defined(value))
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return false;
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ret = member { key, std::move(value) };
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return true;
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})};
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return stringify(buf, begin(members), e);
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}
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template<class... T>
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inline string_view
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stringify(mutable_buffer &buf,
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const tuple<T...> *b,
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const tuple<T...> *const &e)
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{
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const auto start(begin(buf));
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consume(buf, copy(buf, '['));
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if(b != e)
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{
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stringify(buf, *b);
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for(++b; b != e; ++b)
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{
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consume(buf, copy(buf, ','));
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stringify(buf, *b);
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}
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}
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consume(buf, copy(buf, ']'));
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return { start, begin(buf) };
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}
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template<class... T>
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inline std::ostream &
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operator<<(std::ostream &s, const tuple<T...> &t)
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{
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s << json::strung(t);
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return s;
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}
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} // namespace json
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} // namespace ircd
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