GenerateLayers.cs

#if UNITY_EDITOR
using UnityEngine;
using System.Collections;
using UnityEditor;
using System;
using System.IO;
using System.Text;

public class LayerGenerator : EditorWindow {
    [MenuItem("Edit/Rebuild LAYERS.cs %&L")]
    static void RebuildTagsAndLayersEnums() {
        var enumsPath = "Assets/Scripts/";
        RebuildLayersFile($"{enumsPath}LAYERS.cs");
        AssetDatabase.ImportAsset($"{enumsPath}LAYERS.cs", ImportAssetOptions.ForceUpdate);
    }

    static void rebuildTagsFile(string filePath) {
        var sb = new StringBuilder();
        sb.Append("//This class is auto-generated, do not modify (TagsLayersEnumBuilder.cs)\n");
        sb.Append("public static class Tags {\n");
        var srcArr = UnityEditorInternal.InternalEditorUtility.tags;
        var tags = new String[srcArr.Length];
        Array.Copy(srcArr, tags, tags.Length);
        Array.Sort(tags, StringComparer.InvariantCultureIgnoreCase);
        for (int i = 0, n = tags.Length; i < n; ++i) {
            var tagName = tags[i];
            sb.Append($"\tpublic const string {Process($"{tagName} = \"{tagName}\";\n")}");
        }
        sb.Append("}\n");
        File.WriteAllText(filePath, sb.ToString());
    }

    static void RebuildLayersFile(string filePath) {
        var sb = new StringBuilder();
        sb.Append("//This class is auto-generated, do not modify (use Tools/TagsLayersEnumBuilder)\n");
        sb.Append("public static class LAYERS {\n");
        var layers = UnityEditorInternal.InternalEditorUtility.layers;
        for (int i = 0, n = layers.Length; i < n; ++i) {
            var layerName = layers[i];
            sb.Append($"\tpublic const string {GetVariableName(layerName)} = \"{layerName}\";\n");
        }
        sb.Append("\n");
        for (int i = 0, n = layers.Length; i < n; ++i) {
            var layerName = layers[i];
            var layerNumber = LayerMask.NameToLayer(layerName);
            var layerMask = layerNumber == 0 ? "1" : ("1 << " + layerNumber);
            sb.Append($"\tpublic const int {GetVariableName(layerName)}_Mask = {layerMask};\n");
        }
        sb.Append("\n");
        for (int i = 0, n = layers.Length; i < n; ++i) {
            var layerName = layers[i];
            var layerNumber = LayerMask.NameToLayer(layerName);
            sb.Append($"\tpublic const int {GetVariableName(layerName)}_Number = {layerNumber};\n");
        }
        sb.Append("}\n");
        File.WriteAllText(filePath, sb.ToString());
    }

    static string GetVariableName(string str) {
        return Process(str);
    }

    static string Process(string res) {
        res = res.Replace(" ", "");
        if (res[0] >= '0' && res[0] <= '9')
            res = $"_{res}";
        return res;
    }
}
#endif