52 lines
2 KiB
C#
52 lines
2 KiB
C#
using System;
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using System.Linq.Expressions;
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using Svelto.DataStructures;
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using Svelto.ECS;
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using Svelto.ECS.Internal;
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namespace GamecraftModdingAPI.Blocks
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{
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public partial class BlockEngine
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{
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/// <summary>
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/// Holds information needed to construct a component initializer
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/// </summary>
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internal struct BlockInitData
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{
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public FasterDictionary<RefWrapper<Type>, ITypeSafeDictionary> Group;
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}
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internal delegate FasterDictionary<RefWrapper<Type>, ITypeSafeDictionary> GetInitGroup(
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EntityComponentInitializer initializer);
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/// <summary>
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/// Accesses the group field of the initializer
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/// </summary>
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internal GetInitGroup InitGroup = CreateAccessor<GetInitGroup>("_group");
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//https://stackoverflow.com/questions/55878525/unit-testing-ref-structs-with-private-fields-via-reflection
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internal static TDelegate CreateAccessor<TDelegate>(string memberName) where TDelegate : Delegate
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{
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var invokeMethod = typeof(TDelegate).GetMethod("Invoke");
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if (invokeMethod == null)
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throw new InvalidOperationException($"{typeof(TDelegate)} signature could not be determined.");
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var delegateParameters = invokeMethod.GetParameters();
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if (delegateParameters.Length != 1)
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throw new InvalidOperationException("Delegate must have a single parameter.");
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var paramType = delegateParameters[0].ParameterType;
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var objParam = Expression.Parameter(paramType, "obj");
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var memberExpr = Expression.PropertyOrField(objParam, memberName);
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Expression returnExpr = memberExpr;
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if (invokeMethod.ReturnType != memberExpr.Type)
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returnExpr = Expression.ConvertChecked(memberExpr, invokeMethod.ReturnType);
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var lambda =
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Expression.Lambda<TDelegate>(returnExpr, $"Access{paramType.Name}_{memberName}", new[] {objParam});
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return lambda.Compile();
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}
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}
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} |