xmlnode.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 <utility>
#include <variant>
#include <QString>
#include <QVector>
#include "sllconfig.h"

class QSize;

namespace LC::Util
{
    using TagAttrs = QVector<std::pair<QByteArray, QString>>;

    struct Tag;

    struct NoNode {};

    using Node = std::variant<Tag, QString, NoNode>;
    using Nodes = QVector<Node>;

    UTIL_SLL_API Nodes operator+ (Node&&, Nodes&&);
    UTIL_SLL_API Nodes operator+ (Nodes&&, Node&&);
    UTIL_SLL_API Nodes operator+ (Node&&, Node&&);

    template<typename T>
    concept XmlRepr = std::is_same_v<T, QString> || std::is_same_v<T, QByteArray>;

    struct NoDtd {};
    struct Html5Dtd {};
    struct CustomDtd { QString Dtd_; };
    using Dtd = std::variant<NoDtd, Html5Dtd, CustomDtd>;

    struct TagSerializeConfig
    {
        bool Prolog_ = false;
        Dtd Dtd_ = NoDtd {};
        std::optional<int> Indent_ = {};
    };

    struct Tag
    {
        QByteArray Name_;
        TagAttrs Attrs_ {};

        Nodes Children_ {};

        UTIL_SLL_API static Tag WithText (const QByteArray& name, const QString& contents);
        UTIL_SLL_API static Node WithTextNonEmpty (const QByteArray& name, const QString& contents);

        template<XmlRepr T = QString>
        [[nodiscard]]
        UTIL_SLL_API T Serialize (const TagSerializeConfig& = {}) const;

        UTIL_SLL_API Tag& WithAttr (QByteArray, QString) &&;
    };

    namespace Tags
    {
        extern const Tag Br;

        UTIL_SLL_API Tag Html (Nodes&& children);
        UTIL_SLL_API Tag Charset (const QString& charset);
        UTIL_SLL_API Tag Title (const QString& title);
        UTIL_SLL_API Tag Style (const QString& style);

        UTIL_SLL_API Tag Body (Nodes&& children);

        UTIL_SLL_API Tag Image (const QString& url);
        UTIL_SLL_API Tag Image (const QString& url, const QSize&);
        UTIL_SLL_API Tag Li (Nodes&& children);
        UTIL_SLL_API Tag Ul (Nodes&& children);

        UTIL_SLL_API Tag P (Nodes&& children);

        UTIL_SLL_API Nodes TableGrid (size_t rows, size_t cols, const std::function<Nodes (size_t, size_t)>& cell);
    }
}