mirror of
https://github.com/matrix-construct/construct
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75 lines
2.6 KiB
C
75 lines
2.6 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_OBJECT_H
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/// stack::object is constructed under the scope of either a stack::member,
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/// or a stack::array, or a stack itself. Only stack::member can be
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/// constructed directly under its scope.
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///
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/// For a stack::member parent, the named member is waiting for this value
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/// after leaving the stack at ':' after the name, this object will then
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/// print '{' and dtor with '}' and then return to the stack::member which
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/// will then return to its parent object.
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///
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/// For a stack::array parent, the stack may have been left at '[' or ','
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/// but either way this object will then print '{' and dtor with '}' and
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/// then return to the stack::array.
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///
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/// For a stack itself, this object is considered the "top object" and will
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/// open the stack with '{' and accept member instances under its scope
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/// until closing the stack with '}' after which the stack is done()
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///
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struct ircd::json::stack::object
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{
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member m; ///< optional internal member
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stack *s {nullptr}; ///< root stack ref
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member *pm {nullptr}; ///< parent member (if value of one)
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array *pa {nullptr}; ///< parent array (if value in one)
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member *cm {nullptr}; ///< current child member
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size_t mc {0}; ///< members witnessed (monotonic)
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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::object &);
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object(stack &s); ///< Object is top
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object(array &pa); ///< Object is value in the array
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object(member &pm); ///< Object is value of named member
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object(object &po, const string_view &name);
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object(stack &s, const string_view &name);
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object(object &&) noexcept;
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object(const object &) = delete;
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~object() noexcept;
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static const object &top(const stack &);
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static object &top(stack &);
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};
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template<class... T>
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inline void
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ircd::json::stack::object::append(const json::tuple<T...> &t)
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{
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for_each(t, [this](const auto &name, const auto &_value)
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{
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const json::value value
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{
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_value
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};
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if(defined(value))
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json::stack::member
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{
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*this, name, value
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};
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});
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}
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