taintedstring.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 <QString>

namespace LC::Util
{
    template<typename L, typename R>
    concept Concatable = requires (L&& l, R&& r) { std::forward<L> (l) + std::forward<R> (r); };

    class TaintedString
    {
        QString String_;
    public:
        template<typename... Args>
            requires std::constructible_from<QString, Args&&...>
        explicit TaintedString (Args&&... args)
        : String_ { std::forward<Args> (args)... }
        {
        }

        TaintedString (const TaintedString&) = default;
        TaintedString (TaintedString&&) = default;
        TaintedString& operator= (const TaintedString&) = default;
        TaintedString& operator= (TaintedString&&) = default;

        [[nodiscard]] QString ToHtmlEscaped () const
        {
            return String_.toHtmlEscaped ();
        }

        [[nodiscard]] QString UnsafeGetRaw () const
        {
            return String_;
        }

        bool IsEmpty () const
        {
            return String_.isEmpty ();
        }

        template<typename... Args>
            requires (std::is_same_v<TaintedString, std::decay_t<Args>>&& ...)
        friend TaintedString Format (const QString& pattern, Args&&... args)
        {
            return TaintedString { pattern.arg (std::forward_like<Args> (args.String_)...) };
        }

        friend TaintedString operator+ (const TaintedString& l, const TaintedString& r)
        {
            return TaintedString { l.String_ + r.String_ };
        }

        template<typename T>
            requires (!std::same_as<std::decay_t<T>, TaintedString>) && Concatable<const QString&, T&&>
        friend TaintedString operator+ (const TaintedString& l, T&& r)
        {
            return TaintedString { l.String_ + std::forward<T> (r) };
        }

        template<typename T>
            requires (!std::same_as<std::decay_t<T>, TaintedString>) && Concatable<T&&, const QString&>
        friend TaintedString operator+ (T&& l, const TaintedString& r)
        {
            return TaintedString { std::forward<T> (l) + r.String_ };
        }
    };
}