domchildrenrange.h

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

#pragma once

#include <QDomElement>
#include <QString>
#include "sllconfig.h"

namespace LC::Util
{
    inline auto DomChildren (const QDomNode& parent, const QString& tag)
    {
        struct Iterator
        {
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-local-typedefs"
            using difference_type = ptrdiff_t;
            using value_type = QDomElement;
            using reference = QDomElement&;
            using iterator_category = std::forward_iterator_tag;
#pragma GCC diagnostic pop

            QDomElement Elem_;
            const QString Tag_;

            bool operator== (const Iterator& other) const
            {
                return Elem_ == other.Elem_;
            }

            Iterator& operator++ ()
            {
                Elem_ = Elem_.nextSiblingElement (Tag_);
                return *this;
            }

            QDomElement& operator* ()
            {
                return Elem_;
            }
        };

        struct Range
        {
            const Iterator Begin_;

            auto begin () const { return Begin_; }
            auto end () const { return Iterator {}; }
        };

        auto firstChild = parent.firstChildElement (tag);
        return Range { { firstChild, tag } };
    }

    UTIL_SLL_API QVector<QDomElement> DomDescendants (const QDomElement& parent, const QString& tag);
}