//-----------------------------------------------------------------------
// -----------------------------------------------------------------------
// file="RegularExpression.StateMachine"
// Project: StgSharp
// AuthorGroup: Nitload
// Copyright (c) Nitload. All rights reserved.
//     
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//     
// -----------------------------------------------------------------------
// -----------------------------------------------------------------------
using StgSharp.State;

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.Threading.Tasks;

namespace StgSharp.RegularAnalysis
{
    public partial class RegularExpression
    {

        private readonly RegularExpressionState _state;

        private class RegularExpressionState : ISimpleStateMachine<RegularExpressionStateNode, int, RegularExpressionStateContext>
        {

            public ref readonly RegularExpressionStateNode this[
                                                           int label
            ] => throw new NotImplementedException();

            public ref readonly RegularExpressionStateNode GetCurrentStateNode()
            {
                throw new NotImplementedException();
            }

            public void Reset()
            {
                throw new NotImplementedException();
            }

            public bool TryMoveNext(
                        RegularExpressionStateContext ctx
            )
            {
                throw new NotImplementedException();
            }

        }

        private struct RegularExpressionStateNode : ISimpleStateMachineNode<int, RegularExpressionStateContext>
        {

            public ICollection<int> AvailableStateLabels => throw new NotImplementedException();

            public SimpleStateMachineNodeTransition<int, RegularExpressionStateContext>
                        Transition => throw new NotImplementedException();

            public bool TryTransaction(
                        RegularExpressionStateContext context,
                        out int label
            )
            {
                throw new NotImplementedException();
            }

        }

        private class RegularExpressionStateContext : StateContext
        {

            public int Begin { get; set; }

            public int Position { get; set; }

            public ReadOnlySpan<char> CurrentCharSpan => Source.AsSpan()[Begin..Position];

            public string Source { get; init; }

        }

    }
}