tagschange.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 "tagschange.h"
#include <algorithm>
 
namespace LC::Util
{
    namespace
    {
        QStringList Difference (const QStringList& from, const QStringList& subtracted)
        {
            QStringList result;
            for (const auto& tag : from)
                if (!subtracted.contains (tag) && !result.contains (tag))
                    result << tag;
            return result;
        }
 
        bool IsSubset (const QStringList& sub, const QStringList& of)
        {
            return std::ranges::all_of (sub, [&of] (const QString& tag) { return of.contains (tag); });
        }
    }
 
    QStringList TagsChange::Added () const
    {
        return Difference (After_, Before_);
    }
 
    QStringList TagsChange::Removed () const
    {
        return Difference (Before_, After_);
    }
 
    bool TagsChange::IsEmpty () const
    {
        return IsSubset (After_, Before_) && IsSubset (Before_, After_);
    }
 
    QStringList TagsChange::ApplyTo (QStringList tags) const
    {
        for (const auto& tag : Removed ())
            tags.removeAll (tag);
 
        for (const auto& tag : Added ())
            if (!tags.contains (tag))
                tags << tag;
 
        return tags;
    }
}