mirror of
https://github.com/matrix-construct/construct
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101 lines
2.9 KiB
C
101 lines
2.9 KiB
C
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// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2023 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_STACK_MEMBER_H
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/// stack::member is an intermediary that is constructed under the scope of
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/// a parent stack::object. It takes a name argument. It then requires one
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/// object or array be constructed under its scope as its value, or a
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/// json::value / already strung JSON must be appended as its value.
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///
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/// If the value is supplied in the constructor argument an instance of
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/// this class does not have to be held (use constructor as function).
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///
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struct ircd::json::stack::member
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{
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stack *s {nullptr}; ///< root stack ref
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object *po {nullptr}; ///< parent object
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string_view name; ///< member name state
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object *co {nullptr}; ///< current child object
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array *ca {nullptr}; ///< current child array
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bool vc {false}; ///< value witnessed
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void _pre_append();
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void _post_append();
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public:
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template<class... T> void append(const json::tuple<T...> &);
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void append(const json::value &);
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member(object &po, const string_view &name);
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member(stack &s, const string_view &name);
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member(object &po, const string_view &name, const json::value &v);
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member(stack &s, const string_view &name, const json::value &);
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template<class... T> member(object &po, const string_view &name, const json::tuple<T...> &t);
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template<class... T> member(stack &s, const string_view &name, const json::tuple<T...> &t);
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member() = default;
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member(const member &) = delete;
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member(member &&) noexcept;
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~member() noexcept;
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static const member &top(const stack &);
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static member &top(stack &);
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};
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template<class... T>
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inline
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ircd::json::stack::member::member(stack &s,
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const string_view &name,
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const json::tuple<T...> &t)
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:member
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{
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stack::top<object>(s), name, t
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}
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{}
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template<class... T>
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inline
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ircd::json::stack::member::member(object &po,
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const string_view &name,
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const json::tuple<T...> &t)
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:member{po, name}
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{
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append(t);
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}
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template<class... T>
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inline void
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ircd::json::stack::member::append(const json::tuple<T...> &t)
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{
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_pre_append();
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const unwind post{[this]
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{
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_post_append();
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}};
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s->append(serialized(t), [&t](mutable_buffer buf)
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{
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return ircd::size(stringify(buf, t));
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});
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}
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inline void
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ircd::json::stack::member::_pre_append()
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{
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assert(!vc);
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}
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inline void
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ircd::json::stack::member::_post_append()
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{
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vc |= true;
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}
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