json.h

Go to the documentation of this file.

/**********************************************************************
 * LeechCraft - modular cross-platform feature rich internet client.
 * Copyright (C) 2006-2014  Georg Rudoy
 *
 * Distributed under the Boost Software License, Version 1.0.
 * (See accompanying file LICENSE or copy at https://www.boost.org/LICENSE_1_0.txt)
 **********************************************************************/
 
#pragma once
 
#include "sllconfig.h"
#include <stdexcept>
#include <QJsonArray>
#include <QJsonDocument>
#include <QJsonObject>
#include <QJsonValue>
 
class QByteArray;
 
namespace LC::Util
{
    template<typename, typename>
    class Either;
 
    UTIL_SLL_API Either<QString, QJsonDocument> ToJson (const QByteArray& json);
 
    class UTIL_SLL_API UnexpectedJson final : public std::runtime_error
    {
    public:
        explicit UnexpectedJson (QJsonValue::Type expected, const QJsonValue&);
        explicit UnexpectedJson (QJsonValue::Type expected, const QJsonDocument&);
    };
 
    template<QJsonValue::Type Expected>
    auto As (const QJsonValue& value)
    {
        if (value.type () != Expected) [[unlikely]]
            throw UnexpectedJson { Expected, value };
 
        if constexpr (Expected == QJsonValue::Array)
            return value.toArray ();
        if constexpr (Expected == QJsonValue::Object)
            return value.toObject ();
        if constexpr (Expected == QJsonValue::String)
            return value.toString ();
        if constexpr (Expected == QJsonValue::Double)
            return value.toDouble ();
        if constexpr (Expected == QJsonValue::Bool)
            return value.toBool ();
    }
 
    template<QJsonValue::Type Expected>
        requires (Expected == QJsonValue::Object || Expected == QJsonValue::Array)
    auto As (const QJsonDocument& doc)
    {
        if constexpr (Expected == QJsonValue::Object)
        {
            if (doc.isObject ())
                return doc.object ();
        }
        else if constexpr (Expected == QJsonValue::Array)
        {
            if (doc.isArray ())
                return doc.array ();
        }
 
        throw UnexpectedJson { Expected, doc };
    }
 
}