gaemstone/src/gaemstone/Flecs/Core.cs

using gaemstone.ECS;

namespace gaemstone.Flecs;

[BuiltIn, Module, Path("/flecs/core")]
public partial class Core
{
	// Entity Tags

	[Tag] public struct Module {  }
	[Tag] public struct Private {  }
	[Tag] public struct Prefab {  }
	[Tag] public struct Disabled {  }

	[Tag] public struct SlotOf {  }
	[Tag] public struct Flag {  }


	// Component / Relationship Properties

	[Entity, Path("*")]    public struct Wildcard {  }
	[Entity, Path("_")]    public struct Any {  }
	[Entity, Path("this")] public struct This {  }
	[Entity, Path("$")]    public struct Variable {  }

	[Tag] public struct Transitive {  }
	[Tag] public struct Reflexive {  }
	[Tag] public struct Symmetric {  }
	[Tag] public struct Final {  }
	[Tag] public struct DontInherit {  }
	[Tag] public struct Tag {  }
	[Tag] public struct Union {  }
	[Tag] public struct Exclusive {  }
	[Tag] public struct Acyclic {  }
	[Tag] public struct Traversable {  }
	[Relation, Tag] public struct With {  }
	[Tag] public struct OneOf {  }


	// Entity Relationships

	[Relation, Tag] public struct ChildOf {  }
	[Relation, Tag] public struct IsA {  }
	[Relation, Tag] public struct DependsOn {  }


	// Identifier Tags

	[Tag] public struct Name {  }
	[Tag] public struct Symbol {  }
	[Tag] public struct Alias {  }


	// Observer Events

	[Entity] public struct OnAdd {  }
	[Entity] public struct OnRemove {  }
	[Entity] public struct OnSet {  }
	[Entity] public struct UnSet {  }

	[Entity] public struct OnTableCreate {  }
	[Entity] public struct OnTableDelete {  }
	[Entity] public struct OnTableEmpty {  }
	[Entity] public struct OnTableFilled {  }


	// Related to Deletion Events

	[Relation, Tag] public struct OnDelete {  }
	[Relation, Tag] public struct OnDeleteTarget {  }

	[Tag] public struct Remove {  }
	[Tag] public struct Delete {  }
	[Tag] public struct Panic {  }


	// Components

	[Component]
	public readonly struct Component
	{
		public int Size { get; }
		public int Alignment { get; }
	}

	[Relation, Component]
	public readonly struct Identifier
	{
#pragma warning disable IDE0051 // Disable "unused" hint.
#pragma warning disable CS0169  // Disable "unused" warning.
#pragma warning disable CS0649  // Disable "never assigned to" warning.
		private unsafe readonly void* _value;
		private readonly nint _length;
		private readonly ulong _hash;
		private readonly ulong _indexHash;
		private unsafe readonly void* _index;
#pragma warning restore

		public override string? ToString() { unsafe {
			// TODO: What does Flecs do if you give it "" as an identifier?
			if ((_value == null) || (_length == 0)) return null;
			else return new UTF8View(new(_value, (int)_length)).ToString();
		} }

		public static implicit operator string?(Identifier id)
			=> id.ToString();
	}
}