loggingfilter.cpp

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/**********************************************************************
 * 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)
 **********************************************************************/

#include "loggingfilter.h"
#include <QLoggingCategory>

namespace LC::Util
{
    struct LoggingFilter::Context
    {
        Categories ToDisable_;
        QHash<QLoggingCategory*, QList<QtMsgType>> Disabled_ {};
        QLoggingCategory::CategoryFilter PreviousFilter_ {};
    };

    QList<LoggingFilter::Context> LoggingFilter::ContextStack_;

    LoggingFilter::LoggingFilter (const Categories& cats)
    {
        ContextStack_.push_back ({ .ToDisable_ = cats });
        ContextStack_.back ().PreviousFilter_ = QLoggingCategory::installFilter (&Filter);
    }

    LoggingFilter::~LoggingFilter ()
    {
        const auto& context = ContextStack_.takeLast ();
        for (const auto& [cat, levels] : context.Disabled_.asKeyValueRange ())
            for (const auto level : levels)
                cat->setEnabled (level, true);

        QLoggingCategory::installFilter (context.PreviousFilter_);
    }

    void LoggingFilter::Filter (QLoggingCategory *category)
    {
        auto& context = ContextStack_.back ();

        if (context.PreviousFilter_)
            context.PreviousFilter_ (category);

        for (const auto level : context.ToDisable_.value (QLatin1String { category->categoryName () }))
            if (category->isEnabled (level))
            {
                category->setEnabled (level, false);
                context.Disabled_ [category] << level;
            }
    }
}