UnityEditor - FindAssetsByTypeAsync and LoadAssetAsync (UniTask async wrapper, automatically finding localId)

FindAssetsByTypeAsync.cs

public static class EditorUtils 
{
	public static async IAsyncEnumerable<T> FindAssetsByTypeAsync<T>() where T : UnityEngine.Object 
	{
		var queue = ListPool<UniTask<T>.Awaiter>.Get();
		try
		{
			foreach (string guid in guids)
			{
				string assetPath = AssetDatabase.GUIDToAssetPath(guid);
				queue.Add(LoadAssetAsync<T>(assetPath).GetAwaiter());
			}

			while (queue.Count > 0)
			{
				for (int i = 0; i < queue.Count; i++)
				{
					if (queue[i].IsCompleted)
					{
						yield return queue[i].GetResult();
						queue.RemoveAt(i);
						i--;
					}
				}

				await UniTask.Yield();
			}
		}
		finally
		{
			ListPool<UniTask<T>.Awaiter>.Release(queue);
		}
	}

	public static async UniTask<T> LoadAssetAsync<T>(string path) where T : UnityEngine.Object 
	{
		var utcs = new UniTaskCompletionSource<T>();
		var mainObjectId = await GetMainObjectFileIDAsync(path);
		if (mainObjectId == 0) 
		{
			mainObjectId = await ResolveFallbackMainObjectFileIdAsync(path);
		}
		var op = AssetDatabase.LoadObjectAsync(path, mainObjectId);

		void OnCompleted(AsyncOperation asyncOperation) {
			op.completed -= OnCompleted;
			utcs.TrySetResult(op.LoadedObject as T);
		}

		op.completed += OnCompleted;

		return await utcs.Task;
	}

	private static async UniTask<int> GetMainObjectFileIDAsync(string assetPath)
	{
		string metaFilePath = assetPath + ".meta";
		if (File.Exists(metaFilePath))
		{
			string metaFileContent = await File.ReadAllTextAsync(metaFilePath);
			Match match = Regex.Match(metaFileContent, @"mainObjectFileID: (-?\d+)");
			if (match.Success)
			{
				if (int.TryParse(match.Groups[1].Value, out int mainObjectFileID))
				{
					return mainObjectFileID;
				}
			}
		}

		throw new Exception("Meta file not found or mainObjectFileID not present");
	}

	private static async UniTask<int> ResolveFallbackMainObjectFileIdAsync(string assetPath)
	{
		// https://docs.unity3d.com/Manual/ClassIDReference.html
		// assume main object id = class id * 100000
		// --- !u!114 &11400000
		// --- !u!x &x00000


		if (File.Exists(assetPath))
		{
			string fileContent = await File.ReadAllTextAsync(assetPath);
			// try to find a match that has the !u!x &x00000 parity
			Match match = Regex.Match(fileContent, @"--- !u!(?<classid>\d+) &(\k<classid>00000)");
			if (match.Success)
			{
				if (int.TryParse(match.Groups[1].Value, out int localId))
				{
					return localId;
				}
			}
		}

		throw new Exception("Asset file not found or fallback mainObjectFileID not found");
	}
}