mirror of
https://github.com/matrix-construct/construct
synced 2024-10-30 02:18:58 +01:00
383 lines
8.3 KiB
C++
383 lines
8.3 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) 2016-2018 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_H
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#include "property.h"
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namespace ircd {
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namespace json {
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//TODO: sort
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template<class tuple> struct keys;
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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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static constexpr size_t size();
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operator json::value() const;
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operator crh::sha256::buf() const;
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template<class... U> explicit tuple(const tuple<U...> &);
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template<class U> explicit tuple(const json::object &, const json::keys<U> &);
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template<class U> explicit tuple(const tuple &, const json::keys<U> &);
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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,
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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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class test,
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class R>
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using enable_if_tuple_and = typename std::enable_if<is_tuple<tuple>() && test(), 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 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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} // namespace json
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} // namespace ircd
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#include "key.h"
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#include "indexof.h"
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namespace ircd {
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namespace json {
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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<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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} // namespace json
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} // namespace ircd
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#include "get.h"
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#include "at.h"
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#include "for_each.h"
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#include "until.h"
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#include "set.h"
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namespace ircd {
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namespace json {
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template<class... T>
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template<class U>
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tuple<T...>::tuple(const json::object &object,
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const json::keys<U> &keys)
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{
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std::for_each(std::begin(object), std::end(object), [this, &keys]
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(const auto &member)
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{
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if(keys.has(member.first))
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set(*this, member.first, member.second);
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});
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}
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template<class... T>
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tuple<T...>::tuple(const json::object &object)
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{
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std::for_each(std::begin(object), std::end(object), [this]
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(const auto &member)
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{
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set(*this, member.first, member.second);
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});
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}
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template<class... T>
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tuple<T...>::tuple(const json::iov &iov)
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{
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std::for_each(std::begin(iov), std::end(iov), [this]
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(const auto &member)
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{
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set(*this, member.first, member.second);
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});
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}
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template<class... T>
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tuple<T...>::tuple(const std::initializer_list<member> &members)
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{
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std::for_each(std::begin(members), std::end(members), [this]
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(const auto &member)
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{
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set(*this, member.first, member.second);
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});
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}
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template<class... T>
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template<class U>
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tuple<T...>::tuple(const tuple &t,
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const keys<U> &keys)
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{
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for_each(t, [this, &keys]
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(const auto &key, const auto &val)
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{
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if(keys.has(key))
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set(*this, key, val);
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});
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}
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template<class... T>
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template<class... U>
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tuple<T...>::tuple(const tuple<U...> &t)
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{
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for_each(t, [this]
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(const auto &key, const auto &val)
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{
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set(*this, key, val);
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});
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}
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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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} // namespace json
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} // namespace ircd
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#include "_key_transform.h"
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#include "keys.h"
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#include "_member_transform.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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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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std::array<member, tuple.size()> 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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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...> *e)
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{
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const auto start(begin(buf));
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consume(buf, copy(buf, "["_sv));
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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, ","_sv));
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stringify(buf, *b);
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}
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}
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consume(buf, copy(buf, "]"_sv));
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return { start, begin(buf) };
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}
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template<class... T>
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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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template<class... T>
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tuple<T...>::operator
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crh::sha256::buf()
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const
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{
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//TODO: XXX
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const auto preimage
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{
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json::strung(*this)
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};
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return crh::sha256::buf
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{
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[&preimage](auto &buf)
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{
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sha256{buf, const_buffer{preimage}};
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}
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};
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}
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template<class... T>
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tuple<T...>::operator
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json::value()
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const
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{
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json::value ret;
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ret.type = OBJECT;
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ret.create_string(serialized(*this), [this]
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(mutable_buffer buffer)
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{
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stringify(buffer, *this);
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});
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return ret;
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}
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} // namespace json
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} // namespace ircd
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