LuaTextAsset.cs

using System;
using System.IO;
using System.Text;
using UnityEngine;
using Object = UnityEngine.Object;
#if UNITY_EDITOR
using UnityEditor;
#endif

[Serializable]
public class LuaTextAsset
{

	public const string Extension = ".lua";
	
	[SerializeField] private string path;
	
	[SerializeField] private string textString;

	[SerializeField] private string byteString;

	public string text => textString;

	public byte[] bytes => Encoding.ASCII.GetBytes(byteString);
	
	public static implicit operator TextAsset(LuaTextAsset textAsset)
	{
		return new TextAsset(textAsset.textString);
	}

	public static implicit operator LuaTextAsset(TextAsset textAsset)
	{
		return new LuaTextAsset { textString = textAsset.text };
	}
}

#if UNITY_EDITOR
[CustomPropertyDrawer(typeof(LuaTextAsset))]
public class LuaInspectorEditor : PropertyDrawer
{
	
	public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
	{
		var path = property.FindPropertyRelative("path").stringValue;
		var loaded = AssetDatabase.LoadAssetAtPath(path, typeof(Object));
		var field = EditorGUI.ObjectField(position, label, loaded, typeof(Object), false);
		var loadPath = AssetDatabase.GetAssetPath(field);
		var fileExtension = Path.GetExtension(loadPath);
		if (field == null || fileExtension != LuaTextAsset.Extension)
		{
			property.Set("path", "");
			property.Set("textString", "");
			property.Set("byteString", "");
		}
		else
		{
			var pathProperty = property.FindPropertyRelative("path");
			property.Set("path", loadPath.Substring(loadPath.IndexOf("Assets", StringComparison.Ordinal)));
			property.Set("textString", File.ReadAllText(pathProperty.stringValue));
			property.Set("byteString", Encoding.ASCII.GetString(File.ReadAllBytes(pathProperty.stringValue)));
		}
	}
}

public static class SerializedPropertyExtension
{
	public static void Set(this SerializedProperty property, string name, string value)
	{
		var pathProperty = property.FindPropertyRelative(name);
		pathProperty.stringValue = value;
	}
}

#endif