恢复简化版的 LuaAsset

Assets/XLua/Src/Editor/LuaImporter.cs

@@ -0,0 +1,40 @@
+#if UNITY_2018_1_OR_NEWER
+using UnityEngine;
+using UnityEditor;
+
+using System.IO;
+
+#if UNITY_2020_2_OR_NEWER
+using UnityEditor.AssetImporters;
+#else
+using UnityEditor.Experimental.AssetImporters;
+#endif
+
+namespace XLua
+{
+    [ScriptedImporter(2, new[] { "lua" })]
+    public class LuaImporter : ScriptedImporter
+    {
+        private const string IconGUID = "0eb86212f60529a4b9e9deeeebde247c";
+
+        const string Tag = "LuaImporter";
+
+        public override void OnImportAsset(AssetImportContext ctx)
+        {
+            var id = AssetDatabase.AssetPathToGUID(ctx.assetPath);
+            var asset = LuaAsset.Create(File.ReadAllText(ctx.assetPath));
+            ctx.AddObjectToAsset("LuaCode", asset, LoadIconTexture(), id);
+            ctx.SetMainObject(asset);
+        }
+
+        private static Texture2D LoadIconTexture()
+        {
+            return AssetDatabase.LoadAssetAtPath(
+                        AssetDatabase.GUIDToAssetPath(IconGUID), 
+                        typeof(Texture2D)
+                    ) as Texture2D;
+        }
+    }
+}
+
+#endif

Assets/XLua/Src/LuaAsset.cs

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+using System;
+using UnityEngine;
+
+namespace XLua
+{
+    public partial class LuaAsset : ScriptableObject
+    {
+        [SerializeField]
+        private string Guid;
+
+        [SerializeField, HideInInspector]
+        private string _code;
+
+        public string Code => _code;
+
+        /**
+         * 保留 “text” 属性兼容以往 TextAsset 的写法
+         * Retain the 'text' property for compatibility with the previous TextAsset usage.
+         **/
+        public string text => Code;
+
+        public override string ToString() => Code;
+
+        public static LuaAsset Create(string code, string guid)
+        {
+            var asset = CreateInstance<LuaAsset>();
+            asset._code = code;
+            asset.Guid = guid;
+            return asset;
+        }
+
+        // In the future, we may be able to add other extended features here.
+    }
+}