mirror of
https://github.com/matrix-construct/construct
synced 2024-07-16 07:28:38 +02:00
1016 lines
21 KiB
C++
1016 lines
21 KiB
C++
/*
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* Copyright (C) 2017 Charybdis Development Team
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* Copyright (C) 2017 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.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#define HAVE_IRCD_JSON_TUPLE_H
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namespace ircd {
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namespace json {
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/// All tuple templates inherit from this non-template type for tagging.
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struct tuple_base
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{
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// EBO tag
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};
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/// A compile-time construct to describe a JSON object's members and types.
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///
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/// Member access by name is O(1) because of recursive constexpr function
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/// inlining when translating a name to the index number which is then used
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/// as the template argument to std::get() for the value.
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///
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/// Here we represent a JSON object with a named tuple, allowing the programmer
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/// to create a structure specifying all of the potentially valid members of the
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/// object. Thus at runtime, the tuple only carries around its values like a
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/// `struct`. Unlike a `struct`, the tuple is abstractly iterable and we have
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/// implemented logic operating on all JSON tuples regardless of their makeup
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/// without any effort from a developer when creating a new tuple.
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///
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/// The member structure for the tuple is called `property` because json::member
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/// is already used to pair together runtime oriented json::values.
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///
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/// Create and use a tuple to efficiently extract members from a json::object.
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/// The tuple will populate its own members during a single-pass iteration of
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/// the JSON input.
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///
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/// But remember, the tuple carries very little information for you at runtime
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/// which may make it difficult to represent all JS phenomena like "undefined"
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/// and "null".
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///
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template<class... T>
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struct tuple
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:std::tuple<T...>
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,tuple_base
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{
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using tuple_type = std::tuple<T...>;
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using super_type = tuple<T...>;
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operator json::value() const;
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static constexpr size_t size();
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tuple(const json::object &);
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tuple(const json::iov &);
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tuple(const std::initializer_list<member> &);
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tuple() = default;
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};
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template<class tuple>
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constexpr bool
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is_tuple()
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{
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return std::is_base_of<tuple_base, tuple>::value;
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}
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template<class tuple, class R>
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using enable_if_tuple = typename std::enable_if<is_tuple<tuple>(), R>::type;
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template<class tuple>
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using tuple_type = typename tuple::tuple_type;
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template<class tuple>
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using tuple_size = std::tuple_size<tuple_type<tuple>>;
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template<class tuple,
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size_t i>
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using tuple_element = typename std::tuple_element<i, tuple_type<tuple>>::type;
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template<class tuple,
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size_t i>
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using tuple_value_type = typename tuple_element<tuple, i>::value_type;
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template<class... T>
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constexpr size_t
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tuple<T...>::size()
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{
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return std::tuple_size<tuple_type>();
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}
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template<class tuple>
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auto &
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stdcast(const tuple &o)
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{
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return static_cast<const typename tuple::tuple_type &>(o);
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}
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template<class tuple>
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auto &
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stdcast(tuple &o)
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{
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return static_cast<typename tuple::tuple_type &>(o);
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}
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template<class tuple>
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constexpr enable_if_tuple<tuple, size_t>
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size()
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{
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return tuple_size<tuple>::value;
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}
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template<class tuple,
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size_t i>
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constexpr enable_if_tuple<tuple, const char *const &>
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key()
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{
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return tuple_element<tuple, i>::key;
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}
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template<size_t i,
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class tuple>
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enable_if_tuple<tuple, const char *const &>
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key(const tuple &t)
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{
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return std::get<i>(t).key;
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}
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template<class tuple,
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size_t hash,
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size_t i>
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constexpr typename std::enable_if<i == size<tuple>(), size_t>::type
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indexof()
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{
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return size<tuple>();
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}
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template<class tuple,
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size_t hash,
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size_t i = 0>
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constexpr typename std::enable_if<i < size<tuple>(), size_t>::type
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indexof()
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{
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constexpr auto equal
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{
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ircd::hash(key<tuple, i>()) == hash
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};
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return equal? i : indexof<tuple, hash, i + 1>();
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}
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template<class tuple,
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size_t i>
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constexpr typename std::enable_if<i == size<tuple>(), size_t>::type
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indexof(const char *const &name)
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{
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return size<tuple>();
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}
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template<class tuple,
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size_t i = 0>
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constexpr typename std::enable_if<i < size<tuple>(), size_t>::type
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indexof(const char *const &name)
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{
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constexpr auto equal
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{
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_constexpr_equal(key<tuple, i>(), name)
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};
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return equal? i : indexof<tuple, i + 1>(name);
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}
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template<class tuple,
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size_t i>
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constexpr typename std::enable_if<i == size<tuple>(), size_t>::type
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indexof(const string_view &name)
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{
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return size<tuple>();
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}
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template<class tuple,
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size_t i = 0>
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constexpr typename std::enable_if<i < size<tuple>(), size_t>::type
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indexof(const string_view &name)
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{
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const auto equal
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{
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name == key<tuple, i>()
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};
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return equal? i : indexof<tuple, i + 1>(name);
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}
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template<class tuple>
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constexpr bool
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key_exists(const string_view &key)
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{
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return indexof<tuple>(key) < size<tuple>();
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}
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template<size_t i,
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class tuple>
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enable_if_tuple<tuple, tuple_value_type<tuple, i> &>
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val(tuple &t)
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{
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return static_cast<tuple_value_type<tuple, i> &>(std::get<i>(t));
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}
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template<size_t i,
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class tuple>
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enable_if_tuple<tuple, const tuple_value_type<tuple, i> &>
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val(const tuple &t)
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{
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return static_cast<const tuple_value_type<tuple, i> &>(std::get<i>(t));
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}
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template<size_t hash,
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class... T>
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const tuple_value_type<tuple<T...>, indexof<tuple<T...>, hash>()> &
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get(const tuple<T...> &t)
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{
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constexpr size_t idx
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{
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indexof<tuple<T...>, hash>()
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};
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return val<idx>(t);
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}
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template<size_t hash,
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class... T>
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tuple_value_type<tuple<T...>, indexof<tuple<T...>, hash>()>
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get(const tuple<T...> &t,
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const tuple_value_type<tuple<T...>, indexof<tuple<T...>, hash>()> &def)
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{
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constexpr size_t idx
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{
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indexof<tuple<T...>, hash>()
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};
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const auto &ret
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{
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val<idx>(t)
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};
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using value_type = tuple_value_type<tuple<T...>, idx>;
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//TODO: undefined
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return ret != value_type{}? ret : def;
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}
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template<size_t hash,
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class... T>
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tuple_value_type<tuple<T...>, indexof<tuple<T...>, hash>()> &
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get(tuple<T...> &t)
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{
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constexpr size_t idx
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{
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indexof<tuple<T...>, hash>()
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};
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return val<idx>(t);
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}
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template<size_t hash,
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class... T>
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tuple_value_type<tuple<T...>, indexof<tuple<T...>, hash>()> &
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get(tuple<T...> &t,
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tuple_value_type<tuple<T...>, indexof<tuple<T...>, hash>()> &def)
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{
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//TODO: undefined
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auto &ret{get<hash, T...>(t)};
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using value_type = decltype(ret);
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return ret != value_type{}? ret : def;
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}
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template<size_t hash,
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class tuple>
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enable_if_tuple<tuple, const tuple_value_type<tuple, indexof<tuple, hash>()> &>
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at(const tuple &t)
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{
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constexpr size_t idx
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{
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indexof<tuple, hash>()
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};
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auto &ret
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{
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val<idx>(t)
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};
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using value_type = tuple_value_type<tuple, idx>;
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//TODO: undefined
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if(ret == value_type{})
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throw not_found("%s", key<idx>(t));
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return ret;
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}
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template<size_t hash,
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class tuple>
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enable_if_tuple<tuple, tuple_value_type<tuple, indexof<tuple, hash>()> &>
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at(tuple &t)
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{
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constexpr size_t idx
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{
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indexof<tuple, hash>()
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};
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auto &ret
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{
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val<idx>(t)
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};
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using value_type = tuple_value_type<tuple, idx>;
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//TODO: undefined
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if(ret == value_type{})
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throw not_found("%s", key<idx>(t));
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return ret;
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}
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template<const char *const &name,
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class tuple>
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enable_if_tuple<tuple, const tuple_value_type<tuple, indexof<tuple>(name)> &>
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at(const tuple &t)
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{
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constexpr size_t idx
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{
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indexof<tuple>(name)
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};
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auto &ret
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{
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val<idx>(t)
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};
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using value_type = tuple_value_type<tuple, idx>;
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//TODO: undefined
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if(ret == value_type{})
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throw not_found("%s", name);
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return ret;
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}
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template<const char *const &name,
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class tuple>
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enable_if_tuple<tuple, tuple_value_type<tuple, indexof<tuple>(name)> &>
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at(tuple &t)
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{
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constexpr size_t idx
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{
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indexof<tuple>(name)
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};
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auto &ret
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{
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val<idx>(t)
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};
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using value_type = tuple_value_type<tuple, idx>;
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//TODO: undefined
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if(ret == value_type{})
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throw not_found("%s", name);
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return ret;
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}
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template<class tuple,
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class function,
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size_t i>
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typename std::enable_if<i == size<tuple>(), void>::type
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at(tuple &t,
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const string_view &name,
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function&& f)
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{
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}
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template<class tuple,
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class function,
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size_t i = 0>
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typename std::enable_if<i < size<tuple>(), void>::type
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at(tuple &t,
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const string_view &name,
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function&& f)
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{
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if(indexof<tuple>(name) == i)
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f(val<i>(t));
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else
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at<tuple, function, i + 1>(t, name, std::forward<function>(f));
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}
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template<class tuple,
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class function,
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size_t i>
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typename std::enable_if<i == size<tuple>(), void>::type
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at(const tuple &t,
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const string_view &name,
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function&& f)
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{
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}
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template<class tuple,
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class function,
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size_t i = 0>
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typename std::enable_if<i < size<tuple>(), void>::type
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at(const tuple &t,
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const string_view &name,
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function&& f)
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{
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if(indexof<tuple>(name) == i)
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f(val<i>(t));
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else
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at<tuple, function, i + 1>(t, name, std::forward<function>(f));
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}
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template<size_t i,
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class tuple,
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class function>
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typename std::enable_if<i == size<tuple>(), void>::type
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for_each(const tuple &t,
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function&& f)
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{}
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template<size_t i,
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class tuple,
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class function>
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typename std::enable_if<i == size<tuple>(), void>::type
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for_each(tuple &t,
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function&& f)
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{}
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template<size_t i = 0,
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class tuple,
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class function>
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typename std::enable_if<i < size<tuple>(), void>::type
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for_each(const tuple &t,
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function&& f)
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{
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f(key<i>(t), val<i>(t));
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for_each<i + 1>(t, std::forward<function>(f));
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}
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template<size_t i = 0,
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class tuple,
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class function>
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typename std::enable_if<i < size<tuple>(), void>::type
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for_each(tuple &t,
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function&& f)
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{
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f(key<i>(t), val<i>(t));
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for_each<i + 1>(t, std::forward<function>(f));
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}
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template<class tuple,
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class function,
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ssize_t i>
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typename std::enable_if<(i < 0), void>::type
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rfor_each(const tuple &t,
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function&& f)
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{}
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template<class tuple,
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class function,
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ssize_t i>
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typename std::enable_if<(i < 0), void>::type
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rfor_each(tuple &t,
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function&& f)
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{}
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template<class tuple,
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class function,
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ssize_t i = size<tuple>() - 1>
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typename std::enable_if<i < tuple_size<tuple>(), void>::type
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rfor_each(const tuple &t,
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function&& f)
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{
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f(key<i>(t), val<i>(t));
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rfor_each<tuple, function, i - 1>(t, std::forward<function>(f));
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}
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template<class tuple,
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class function,
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ssize_t i = size<tuple>() - 1>
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typename std::enable_if<i < tuple_size<tuple>(), void>::type
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rfor_each(tuple &t,
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function&& f)
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{
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f(key<i>(t), val<i>(t));
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rfor_each<tuple, function, i - 1>(t, std::forward<function>(f));
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}
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template<size_t i,
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class tuple,
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class function>
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typename std::enable_if<i == size<tuple>(), bool>::type
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until(const tuple &t,
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function&& f)
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{
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return true;
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}
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template<size_t i,
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class tuple,
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class function>
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typename std::enable_if<i == size<tuple>(), bool>::type
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until(tuple &t,
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function&& f)
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{
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return true;
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}
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template<size_t i = 0,
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class tuple,
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class function>
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typename std::enable_if<i < size<tuple>(), bool>::type
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until(const tuple &t,
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function&& f)
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{
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return f(key<i>(t), val<i>(t))?
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until<i + 1>(t, std::forward<function>(f)):
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false;
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}
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template<size_t i = 0,
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class tuple,
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class function>
|
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typename std::enable_if<i < size<tuple>(), bool>::type
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until(tuple &t,
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function&& f)
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{
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return f(key<i>(t), val<i>(t))?
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until<i + 1>(t, std::forward<function>(f)):
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false;
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}
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template<size_t i,
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class tuple,
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class function>
|
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typename std::enable_if<i == size<tuple>(), bool>::type
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until(const tuple &a,
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const tuple &b,
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function&& f)
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{
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return true;
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}
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|
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template<size_t i = 0,
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class tuple,
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class function>
|
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typename std::enable_if<i < size<tuple>(), bool>::type
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until(const tuple &a,
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const tuple &b,
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function&& f)
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{
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return f(key<i>(a), val<i>(a), val<i>(b))?
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until<i + 1>(a, b, std::forward<function>(f)):
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false;
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}
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|
template<class tuple,
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|
class function,
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|
ssize_t i>
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typename std::enable_if<(i < 0), bool>::type
|
|
runtil(const tuple &t,
|
|
function&& f)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
template<class tuple,
|
|
class function,
|
|
ssize_t i>
|
|
typename std::enable_if<(i < 0), bool>::type
|
|
runtil(tuple &t,
|
|
function&& f)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
template<class tuple,
|
|
class function,
|
|
ssize_t i = size<tuple>() - 1>
|
|
typename std::enable_if<i < size<tuple>(), bool>::type
|
|
runtil(const tuple &t,
|
|
function&& f)
|
|
{
|
|
return f(key<i>(t), val<i>(t))?
|
|
runtil<tuple, function, i - 1>(t, std::forward<function>(f)):
|
|
false;
|
|
}
|
|
|
|
template<class tuple,
|
|
class function,
|
|
ssize_t i = size<tuple>() - 1>
|
|
typename std::enable_if<i < size<tuple>(), bool>::type
|
|
runtil(tuple &t,
|
|
function&& f)
|
|
{
|
|
return f(key<i>(t), val<i>(t))?
|
|
runtil<tuple, function, i - 1>(t, std::forward<function>(f)):
|
|
false;
|
|
}
|
|
|
|
template<class dst,
|
|
class src>
|
|
typename std::enable_if
|
|
<
|
|
std::is_base_of<json::string, dst>() &&
|
|
std::is_convertible<src, ircd::string_view>(),
|
|
void>::type
|
|
_assign(dst &d,
|
|
src&& s)
|
|
{
|
|
d = unquote(string_view{std::forward<src>(s)});
|
|
}
|
|
|
|
template<class dst,
|
|
class src>
|
|
typename std::enable_if
|
|
<
|
|
!std::is_base_of<json::string, dst>() &&
|
|
std::is_convertible<src, dst>(),
|
|
void>::type
|
|
_assign(dst &d,
|
|
src&& s)
|
|
{
|
|
d = std::forward<src>(s);
|
|
}
|
|
|
|
template<class dst,
|
|
class src>
|
|
typename std::enable_if
|
|
<
|
|
std::is_arithmetic<dst>() &&
|
|
std::is_base_of<std::string_view, typename std::remove_reference<src>::type>() &&
|
|
!std::is_base_of<ircd::byte_view<ircd::string_view>, typename std::remove_reference<src>::type>(),
|
|
void>::type
|
|
_assign(dst &d,
|
|
src&& s)
|
|
try
|
|
{
|
|
d = lex_cast<dst>(std::forward<src>(s));
|
|
}
|
|
catch(const bad_lex_cast &e)
|
|
{
|
|
throw parse_error("cannot convert '%s' to '%s'",
|
|
demangle<src>(),
|
|
demangle<dst>());
|
|
}
|
|
|
|
template<class dst,
|
|
class src>
|
|
typename std::enable_if
|
|
<
|
|
std::is_arithmetic<dst>() &&
|
|
std::is_base_of<ircd::byte_view<ircd::string_view>, typename std::remove_reference<src>::type>(),
|
|
void>::type
|
|
_assign(dst &d,
|
|
src&& s)
|
|
{
|
|
assert(!s.empty());
|
|
d = byte_view<dst>(std::forward<src>(s));
|
|
}
|
|
|
|
template<class dst,
|
|
class src>
|
|
typename std::enable_if
|
|
<
|
|
std::is_base_of<std::string_view, dst>() &&
|
|
std::is_pod<typename std::remove_reference<src>::type>(),
|
|
void>::type
|
|
_assign(dst &d,
|
|
src&& s)
|
|
{
|
|
d = byte_view<string_view>(std::forward<src>(s));
|
|
}
|
|
|
|
template<class dst,
|
|
class src>
|
|
typename std::enable_if
|
|
<
|
|
ircd::json::is_tuple<dst>(),
|
|
void>::type
|
|
_assign(dst &d,
|
|
src&& s)
|
|
{
|
|
d = dst{std::forward<src>(s)};
|
|
}
|
|
|
|
template<class V,
|
|
class... T>
|
|
tuple<T...> &
|
|
set(tuple<T...> &t,
|
|
const string_view &key,
|
|
V&& val)
|
|
try
|
|
{
|
|
at(t, key, [&key, &val]
|
|
(auto &target)
|
|
{
|
|
_assign(target, std::forward<V>(val));
|
|
});
|
|
|
|
return t;
|
|
}
|
|
catch(const std::exception &e)
|
|
{
|
|
throw parse_error("failed to set member '%s' (from %s): %s",
|
|
key,
|
|
demangle<V>(),
|
|
e.what());
|
|
}
|
|
|
|
template<class... T>
|
|
tuple<T...> &
|
|
set(tuple<T...> &t,
|
|
const string_view &key,
|
|
const json::value &value)
|
|
{
|
|
switch(type(value))
|
|
{
|
|
case type::STRING:
|
|
case type::LITERAL:
|
|
set(t, key, string_view{value});
|
|
break;
|
|
|
|
case type::NUMBER:
|
|
if(value.floats)
|
|
set(t, key, value.floating);
|
|
else
|
|
set(t, key, value.integer);
|
|
break;
|
|
|
|
case type::OBJECT:
|
|
case type::ARRAY:
|
|
if(unlikely(!value.serial))
|
|
throw print_error("Type %s must be JSON to be used by tuple member '%s'",
|
|
reflect(type(value)),
|
|
key);
|
|
|
|
set(t, key, string_view{value});
|
|
break;
|
|
}
|
|
|
|
return t;
|
|
}
|
|
|
|
template<class... T>
|
|
tuple<T...>::tuple(const json::object &object)
|
|
{
|
|
std::for_each(std::begin(object), std::end(object), [this]
|
|
(const auto &member)
|
|
{
|
|
set(*this, member.first, member.second);
|
|
});
|
|
}
|
|
|
|
template<class... T>
|
|
tuple<T...>::tuple(const json::iov &iov)
|
|
{
|
|
std::for_each(std::begin(iov), std::end(iov), [this]
|
|
(const auto &member)
|
|
{
|
|
set(*this, member.first, member.second);
|
|
});
|
|
}
|
|
|
|
template<class... T>
|
|
tuple<T...>::tuple(const std::initializer_list<member> &members)
|
|
{
|
|
std::for_each(std::begin(members), std::end(members), [this]
|
|
(const auto &member)
|
|
{
|
|
set(*this, member.first, member.second);
|
|
});
|
|
}
|
|
|
|
template<class tuple,
|
|
class it_a,
|
|
class it_b,
|
|
class closure>
|
|
constexpr auto
|
|
_key_transform(it_a it,
|
|
const it_b end,
|
|
closure&& lambda)
|
|
{
|
|
for(size_t i(0); i < tuple::size() && it != end; ++i)
|
|
{
|
|
*it = lambda(key<tuple, i>());
|
|
++it;
|
|
}
|
|
|
|
return it;
|
|
}
|
|
|
|
template<class tuple,
|
|
class it_a,
|
|
class it_b>
|
|
constexpr auto
|
|
_key_transform(it_a it,
|
|
const it_b end)
|
|
{
|
|
for(size_t i(0); i < tuple::size() && it != end; ++i)
|
|
{
|
|
*it = key<tuple, i>();
|
|
++it;
|
|
}
|
|
|
|
return it;
|
|
}
|
|
|
|
template<class it_a,
|
|
class it_b,
|
|
class... T>
|
|
auto
|
|
_key_transform(const tuple<T...> &tuple,
|
|
it_a it,
|
|
const it_b end)
|
|
{
|
|
for_each(tuple, [&it, &end]
|
|
(const auto &key, const auto &val)
|
|
{
|
|
if(it != end)
|
|
{
|
|
*it = key;
|
|
++it;
|
|
}
|
|
});
|
|
|
|
return it;
|
|
}
|
|
|
|
template<class it_a,
|
|
class it_b,
|
|
class closure,
|
|
class... T>
|
|
auto
|
|
_member_transform_if(const tuple<T...> &tuple,
|
|
it_a it,
|
|
const it_b end,
|
|
closure&& lambda)
|
|
{
|
|
until(tuple, [&it, &end, &lambda]
|
|
(const auto &key, const auto &val)
|
|
{
|
|
if(it == end)
|
|
return false;
|
|
|
|
if(lambda(*it, key, val))
|
|
++it;
|
|
|
|
return true;
|
|
});
|
|
|
|
return it;
|
|
}
|
|
|
|
template<class it_a,
|
|
class it_b,
|
|
class closure,
|
|
class... T>
|
|
auto
|
|
_member_transform(const tuple<T...> &tuple,
|
|
it_a it,
|
|
const it_b end,
|
|
closure&& lambda)
|
|
{
|
|
return _member_transform_if(tuple, it, end, [&lambda]
|
|
(auto&& ret, const auto &key, const auto &val)
|
|
{
|
|
ret = lambda(key, val);
|
|
return true;
|
|
});
|
|
}
|
|
|
|
template<class it_a,
|
|
class it_b,
|
|
class... T>
|
|
auto
|
|
_member_transform(const tuple<T...> &tuple,
|
|
it_a it,
|
|
const it_b end)
|
|
{
|
|
return _member_transform_if(tuple, it, end, []
|
|
(auto&& ret, const auto &key, const auto &val)
|
|
{
|
|
ret = member { key, val };
|
|
return true;
|
|
});
|
|
}
|
|
|
|
template<class T>
|
|
constexpr bool
|
|
serialized_lex_cast()
|
|
{
|
|
using type = typename std::remove_reference<T>::type;
|
|
return std::is_arithmetic<type>::value;
|
|
}
|
|
|
|
template<class T>
|
|
typename std::enable_if<serialized_lex_cast<T>(), size_t>::type
|
|
serialized(T&& t)
|
|
{
|
|
return lex_cast(t).size();
|
|
}
|
|
|
|
template<class T>
|
|
typename std::enable_if<serialized_lex_cast<T>(), bool>::type
|
|
defined(T&& t)
|
|
{
|
|
return t != typename std::remove_reference<T>::type {0};
|
|
}
|
|
|
|
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)
|
|
{
|
|
if(!defined(val))
|
|
return false;
|
|
|
|
// " " : ,
|
|
ret = 1 + key.size() + 1 + 1 + serialized(val) + 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>
|
|
string_view
|
|
stringify(mutable_buffer &buf,
|
|
const tuple<T...> &tuple)
|
|
{
|
|
std::array<member, tuple.size()> members;
|
|
std::sort(begin(members), end(members), []
|
|
(const auto &a, const auto &b)
|
|
{
|
|
return a.first < b.first;
|
|
});
|
|
|
|
const auto e{_member_transform_if(tuple, begin(members), end(members), []
|
|
(auto &ret, const string_view &key, auto&& val)
|
|
{
|
|
if(!defined(val))
|
|
return false;
|
|
|
|
ret = member { key, val };
|
|
return true;
|
|
})};
|
|
|
|
return stringify(buf, begin(members), e);
|
|
}
|
|
|
|
template<class... T>
|
|
std::ostream &
|
|
operator<<(std::ostream &s, const tuple<T...> &t)
|
|
{
|
|
s << json::strung(t);
|
|
return s;
|
|
}
|
|
|
|
template<class... T>
|
|
tuple<T...>::operator
|
|
json::value()
|
|
const
|
|
{
|
|
json::value ret;
|
|
ret.type = OBJECT;
|
|
ret.create_string(serialized(*this), [this]
|
|
(mutable_buffer buffer)
|
|
{
|
|
stringify(buffer, *this);
|
|
});
|
|
return ret;
|
|
|
|
}
|
|
|
|
} // namespace json
|
|
} // namespace ircd
|