adaptedviewcursor.h

// Description: AdaptedViewCursor class
// Documentation: concrete_views.txt

#ifndef PASTELSYS_ADAPTEDVIEWCURSOR_H
#define PASTELSYS_ADAPTEDVIEWCURSOR_H

#include "pastel/sys/view/adaptedview.h"

namespace Pastel
{

    namespace AdaptedView_
    {

        template <typename Physical, typename Logical,
            typename Adapter, typename ConstCursor>
        class ConstProxy
        {
        public:
            explicit ConstProxy(
                const ConstCursor& cursor)
                : cursor_(cursor)
            {
            }

            operator Logical() const
            {
                Adapter adapter;

                return adapter.convert(*cursor_);
            }

        protected:
            ConstCursor cursor_;
        };

        template <typename Physical, typename Logical,
            typename Adapter, typename Cursor>
        class Proxy
            : public ConstProxy<Physical, Logical, Adapter, Cursor>
        {
        private:
            using Base = ConstProxy<Physical, Logical, Adapter, Cursor>;

            using Base::cursor_;

        public:
            explicit Proxy(const Cursor& cursor)
                : Base(cursor)
            {
            }

            operator Logical() const
            {
                Adapter adapter;

                return adapter.convert(*cursor_);
            }

            template <typename ThatLogical>
            Proxy<Physical, Logical, Adapter, Cursor>& operator=(
                const ThatLogical& that)
            {
                Adapter adapter;

                *cursor_ = adapter.revert(that);
                return *this;
            }

            template <typename ThatLogical>
            Proxy<Physical, Logical, Adapter, Cursor>& operator*=(
                const ThatLogical& that)
            {
                Adapter adapter;

                *cursor_ = adapter.revert(
                    adapter.convert(*cursor_) * that);
                return *this;
            }

            template <typename ThatLogical>
            Proxy<Physical, Logical, Adapter, Cursor>& operator/=(
                const ThatLogical& that)
            {
                Adapter adapter;

                *cursor_ = adapter.revert(
                    adapter.convert(*cursor_) / that);
                return *this;
            }

            template <typename ThatLogical>
            Proxy<Physical, Logical, Adapter, Cursor>& operator+=(
                const ThatLogical& that)
            {
                Adapter adapter;

                *cursor_ = adapter.revert(
                    adapter.convert(*cursor_) + that);
                return *this;
            }

            template <typename ThatLogical>
            Proxy<Physical, Logical, Adapter, Cursor>& operator-=(
                const ThatLogical& that)
            {
                Adapter adapter;

                *cursor_ = adapter.revert(
                    adapter.convert(*cursor_) - that);
                return *this;
            }

            template <typename ThatLogical>
            Logical operator+(const ThatLogical& that) const
            {
                Adapter adapter;
                return adapter.convert(*cursor_) + that;
            }

            template <typename ThatLogical>
            Logical operator-(const ThatLogical& that) const
            {
                Adapter adapter;
                return adapter.convert(*cursor_) - that;
            }

            template <typename ThatLogical>
            Logical operator*(const ThatLogical& that) const
            {
                Adapter adapter;
                return adapter.convert(*cursor_) * that;
            }

            template <typename ThatLogical>
            Logical operator/(const ThatLogical& that) const
            {
                Adapter adapter;
                return adapter.convert(*cursor_) / that;
            }
        };

        template <typename Physical, typename Logical,
            typename Adapter, typename Cursor, typename ThatLogical>
        Logical operator+(const ThatLogical& that,
            const Proxy<Physical, Logical, Adapter, Cursor>& proxy)
        {
            return that + (Logical)proxy;
        }

        template <typename Physical, typename Logical,
            typename Adapter, typename Cursor, typename ThatLogical>
        Logical operator-(const ThatLogical& that,
            const Proxy<Physical, Logical, Adapter, Cursor>& proxy)
        {
            return that - (Logical)proxy;
        }

        template <typename Physical, typename Logical,
            typename Adapter, typename Cursor, typename ThatLogical>
        Logical operator*(const ThatLogical& that,
            const Proxy<Physical, Logical, Adapter, Cursor>& proxy)
        {
            return that * (Logical)proxy;
        }

        template <typename Physical, typename Logical,
            typename Adapter, typename Cursor, typename ThatLogical>
        Logical operator/(const ThatLogical& that,
            const Proxy<Physical, Logical, Adapter, Cursor>& proxy)
        {
            return that / (Logical)proxy;
        }

        template <int N, typename ConstCursor, typename Adapter>
        class ConstAdaptedViewCursor
        {
        protected:
            using PhysicalElement = typename ConstCursor::Element;
            using LogicalElement = typename Adapter::Logical;

        public:
            using Element = LogicalElement;
            typedef ConstProxy<PhysicalElement, LogicalElement, Adapter, ConstCursor>
                ConstReference;

            ConstAdaptedViewCursor()
                : cursor_()
                , adapter_()
            {
            }

            explicit ConstAdaptedViewCursor(
                const ConstCursor& cursor,
                const Adapter& adapter)
                : cursor_(cursor)
                , adapter_(adapter)
            {
            }

            void swap(ConstAdaptedViewCursor& that)
            {
                cursor_.swap(that.cursor_);
                adapter_.swap(that.adapter_);
            }

            void increment(integer index)
            {
                cursor_.increment(index);
            }

            void decrement(integer index)
            {
                cursor_.decrement(index);
            }

            void move(integer index, integer amount)
            {
                cursor_.move(index, amount);
            }

            void move(const Vector<integer, N>& amount)
            {
                cursor_.move(amount);
            }

            const ConstReference* operator->() const
            {
                return &ConstReference(cursor_);
            }

            ConstReference operator*() const
            {
                return ConstReference(cursor_);
            }

        protected:
            ConstCursor cursor_;
            Adapter adapter_;
        };

        template <int N, typename Cursor, typename Adapter>
        class AdaptedViewCursor
            : public ConstAdaptedViewCursor<N, Cursor, Adapter>
        {
        private:
            using Base = ConstAdaptedViewCursor<N, Cursor, Adapter>;

            using LogicalElement = typename Base::LogicalElement;
            using PhysicalElement = typename Base::PhysicalElement;

            using Base::cursor_;
            using Base::adapter_;

        public:
            using Element = typename Base::Element; 
            using ConstReference = typename Base::ConstReference;

            typedef Proxy<PhysicalElement, LogicalElement, Adapter, Cursor>
                Reference;

            using Base::increment;
            using Base::decrement;
            using Base::move;

            friend class ConstAdaptedViewCursor<N, Cursor, Adapter>;

            AdaptedViewCursor()
                : Base()
            {
            }

            explicit AdaptedViewCursor(
                const Cursor& cursor,
                const Adapter& adapter)
                : Base(cursor, adapter)
            {
            }

            void swap(AdaptedViewCursor& that)
            {
                Base::swap(that);
            }

            const Reference* operator->() const
            {
                return &Reference(cursor_);
            }

            Reference operator*() const
            {
                return Reference(cursor_);
            }
        };

    }

}

#endif