//-----------------------------------------------------------------------
// -----------------------------------------------------------------------
// file="ExpSyntaxAnalyzer.Enum"
// Project: StgSharp
// AuthorGroup: Nitload Space
// Copyright (c) Nitload Space. 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.Script;
using StgSharp.Script.Express;

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

namespace StgSharp.Model.Step
{
    internal partial class StepExpSyntaxAnalyzer
    {

        private static string ParseStepEnumLiteral(string source)
        {
            int length = source.Length;
            ReadOnlySpan<char> span = source.AsSpan();
            if (length > 2 && span[0] == '.' && span[length - 1] == '.') {
                return span.Slice(1, length - 2).ToString();
            }
            throw new ExpInvalidSyntaxException($"\"{source}\" is not a valid enum syntax");
        }

        private void TryAppendEnum(Token e)
        {
            ExpSyntaxNode node = e.Value switch
            {
                ".T." => new ExpBoolNode(e, true, true),
                ".F." => new ExpBoolNode(e, false, true),
                ".U." => new ExpLogicValueNode(e, ExpLogic.Unknown, true),
                _ => ExpEnumLiteralNode.Create(e, ParseStepEnumLiteral),
            };
            _cache.PushOperand(node);
        }

    }
}