//-----------------------------------------------------------------------
// -----------------------------------------------------------------------
// file="RegexIR.Prefix"
// 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 System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace StgSharp.RegularAnalysis.Text
{
    internal enum RegexIRPrefixMask
    {

        Prev_Success = 1 << 0,
        Prev_Fail = 1 << 1,
        Always = 1 << 2,
        ExeCondition = Prev_Fail | Prev_Success | Always,
        Pop_Fail = 1 << 3,
        Pop_Success = 1 << 4,
        PopCondition = Pop_Success | Pop_Fail,
        Observe_Line = 1 << 5,
        Observe_Region = 1 << 6,
        ObserveMethod = Observe_Line | Observe_Region

    }

    internal record struct RegexIRPrefix(
                           int WorkingRegion,
                           RegexIRPrefixMask Mask,
                           int ObserveSource
    )
    {

        public override string ToString()
        {
            return $"{WorkingRegion:D4}, {DisplayMask(Mask , RegexIRPrefixMask.ExeCondition):D1}, {DisplayMask(Mask , RegexIRPrefixMask.PopCondition):D1}, {DisplayMask(Mask ,RegexIRPrefixMask.ObserveMethod):D1}, {ObserveSource:D4}";
        }

        private int DisplayMask(
                    RegexIRPrefixMask mask,
                    RegexIRPrefixMask range
        )
        {
            return range switch
            {
                RegexIRPrefixMask.ExeCondition => (int)(mask & RegexIRPrefixMask.ExeCondition) >> 0,
                RegexIRPrefixMask.PopCondition => (int)(mask & RegexIRPrefixMask.PopCondition) >> 3,
                RegexIRPrefixMask.ObserveMethod => (int)(mask & RegexIRPrefixMask.ObserveMethod) >> 5,
                _ => throw new ArgumentOutOfRangeException(nameof(range), range, null)
            };
        }

    }
}