json-utils.hpp
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json-utils.hpp
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	/*
	* This file is part of libkazv.
	* SPDX-FileCopyrightText: 2020-2023 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/

	#pragma once
	#include "libkazv-config.hpp"

	#include <optional>
	#include <functional>
	#include <nlohmann/json.hpp>

	namespace Kazv
	{
	template<class Jsonish, class Key, class Func>
	bool hasAtThat(Jsonish &&j, Key &&k, Func &&f)
	{
	return j.contains(k)
	&& std::invoke(std::forward<Func>(f), std::forward<Jsonish>(j)[std::forward<Key>(k)]);
	}

	// https://spec.matrix.org/v1.8/client-server-api/#conditions-1
	// non-compound canonical JSON values: strings, integers in the range of [-(253)+1, (253)-1], booleans, and null.
	inline bool isNonCompoundCanonicalJsonValue(const nlohmann::json &j)
	{
	return j.is_string()
	\|\| (j.is_number_integer()
	&& j.template get<long long>() <= 9007199254740991LL
	&& j.template get<long long>() >= -9007199254740991LL)
	\|\| j.is_boolean()
	\|\| j.is_null();
	}

	template<class Jsonish, class RangeT>
	std::optional<std::decay_t<Jsonish>> getInJson(Jsonish &&j, RangeT &&path, std::size_t index = 0)
	{
	if (index >= path.size()) {
	return std::forward<Jsonish>(j);
	}

	auto currentSegment = path[index];
	if (j.is_object() && j.contains(currentSegment)) {
	return getInJson(std::forward<Jsonish>(j)[currentSegment], std::forward<RangeT>(path), index + 1);
	}

	return std::nullopt;
	}
	}