Upsilon/Upsilon/BaseTypes/LuaTable.cs

using System.Collections;
using System.Collections.Generic;
using System.Linq;
using Upsilon.Binder;
using Upsilon.Evaluator;

namespace Upsilon.BaseTypes
{
    internal class LuaTable : LuaType, IIndexable, IScopeOwner
    {
        private readonly Dictionary<string, VariableSymbol> _variableLookup;
        public EvaluationScope EvaluationScope { get; }

        public LuaTable(EvaluationScope scope)
        {
            EvaluationScope = scope;
            _variableLookup = scope.Variables.ToDictionary(x => x.Key.Name, x => x.Key);
        }


        public override Type Type => Type.Table;
        public override object ToCSharpObject()
        {
            return EvaluationScope.Variables.Where(x => !x.Key.Local)
                .ToDictionary(x => x.Key.Name, x => x.Value.ToCSharpObject());
        }


        public LuaType Get(string s, EvaluationScope scope)
        {
            if (!_variableLookup.TryGetValue(s, out var variableSymbol))
                return new LuaNull();
            if (variableSymbol.Local && scope != EvaluationScope)
                return new LuaNull();
            if (EvaluationScope.TryGet(variableSymbol, out var o))
            {
                return o;
            }
            return new LuaNull();
        }
    }
}