mirror of
https://github.com/matrix-construct/construct
synced 2024-11-19 08:21:09 +01:00
106 lines
3 KiB
C++
106 lines
3 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_IOV_H
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namespace ircd::json
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{
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struct iov;
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}
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/// A forward list to compose JSON efficiently on the stack.
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///
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/// The IOV gathers members for a JSON object being assembled from various
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/// sources and presents an iteration to a generator. This prevents the need
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/// for multiple generations and copying to occur before the final JSON is
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/// realized, if ever.
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///
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/// Add and remove items on the IOV by construction and destruction one of
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/// the node objects. The IOV has a standard forward list interface, only use
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/// that to observe and sort/rearrange the IOV. Do not add or remove things
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/// that way.
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///
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/// Nodes support a single member each. To support initializer_list syntax
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/// the iov allocates and internally manages the iov node that should have
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/// been on your stack.
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///
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struct ircd::json::iov
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:ircd::iov<ircd::json::member>
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{
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IRCD_EXCEPTION(json::error, error);
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IRCD_EXCEPTION(error, exists);
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struct push;
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struct add;
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struct add_if;
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struct set;
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struct set_if;
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public:
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bool has(const string_view &key) const;
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const value &at(const string_view &key) const;
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iov() = default;
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friend string_view stringify(mutable_buffer &, const iov &);
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friend std::ostream &operator<<(std::ostream &, const iov &);
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friend size_t serialized(const iov &);
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};
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struct ircd::json::iov::push
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:protected ircd::json::iov::node
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{
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template<class... args>
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push(iov &iov, args&&... a)
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:node{iov, std::forward<args>(a)...}
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{}
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push() = default;
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};
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struct ircd::json::iov::add
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:protected ircd::json::iov::node
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{
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add(iov &, member);
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add() = default;
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};
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struct ircd::json::iov::add_if
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:protected ircd::json::iov::node
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{
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add_if(iov &, const bool &, member);
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add_if() = default;
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};
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struct ircd::json::iov::set
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:protected ircd::json::iov::node
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{
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set(iov &, member);
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set() = default;
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};
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struct ircd::json::iov::set_if
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:protected ircd::json::iov::node
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{
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set_if(iov &, const bool &, member);
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set_if() = default;
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};
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