add dynamic world config

Torch.Server/ViewModels/DynamicViewModel.cs

@@ -0,0 +1,115 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using System.Reflection.Emit;
+using HarmonyLib;
+using JetBrains.Annotations;
+
+namespace Torch.Server.ViewModels;
+
+public class DynamicViewModel<T>(T obj) : ViewModel
+{
+    private readonly T _obj = obj;
+    
+    public ViewModel Wrapper { get; } = CreateProxy(obj);
+    
+    public static implicit operator T(DynamicViewModel<T> obj) => obj._obj;
+
+    private static ViewModel CreateProxy(T obj)
+    {
+        if (DynamicViewModel.Proxies.TryGetValue(typeof(T), out var proxy))
+            return (ViewModel)Activator.CreateInstance(proxy, obj);
+
+        var viewModelSetMethod = AccessTools.GetDeclaredMethods(typeof(ViewModel))
+            .First(b => b.Name == "SetValue" && b.GetParameters()[0].ParameterType.IsByRef);
+
+        DynamicViewModel.ModuleBuilder ??=
+            AssemblyBuilder.DefineDynamicAssembly(new("Torch.Server.ViewModels.Generated"), AssemblyBuilderAccess.Run)
+                .DefineDynamicModule("Torch.Server.ViewModels.Generated");
+
+        var type = DynamicViewModel.ModuleBuilder.DefineType($"{typeof(T).FullName}ViewModel",
+            TypeAttributes.Public | TypeAttributes.Sealed | TypeAttributes.Class, typeof(ViewModel));
+        
+        var instanceField = type.DefineField("_instance", typeof(T), FieldAttributes.Private | FieldAttributes.InitOnly);
+
+        var ctor = type.DefineConstructor(MethodAttributes.Public, CallingConventions.HasThis, [typeof(T)]);
+        {
+            var il = ctor.GetILGenerator();
+            
+            il.Emit(OpCodes.Ldarg_0);
+            il.Emit(OpCodes.Ldarg_1);
+            il.Emit(OpCodes.Stfld, instanceField);
+            il.Emit(OpCodes.Ret);
+        }
+        
+        foreach (var field in typeof(T).GetFields(BindingFlags.Instance | BindingFlags.Public))
+        {
+            var prop = type.DefineProperty(field.Name, PropertyAttributes.None, field.FieldType, null);
+            
+            foreach (var customAttribute in field.GetCustomAttributesData())
+            {
+                var hasCustomArgs = customAttribute.NamedArguments?.Any() ?? false;
+                var customArgsField = hasCustomArgs && customAttribute.NamedArguments[0].IsField;
+
+                var constructorArgs = customAttribute.ConstructorArguments.Select(b => b.Value).ToArray();
+                
+                CustomAttributeBuilder attributeBuilder;
+                if (!hasCustomArgs) 
+                    attributeBuilder = new CustomAttributeBuilder(customAttribute.Constructor, constructorArgs);
+                else if (customArgsField)
+                    attributeBuilder = new CustomAttributeBuilder(customAttribute.Constructor, constructorArgs, 
+                        customAttribute.NamedArguments.Select(b => (FieldInfo)b.MemberInfo).ToArray(),
+                        customAttribute.NamedArguments.Select(b => b.TypedValue.Value).ToArray());
+                else
+                    attributeBuilder = new CustomAttributeBuilder(customAttribute.Constructor, constructorArgs, 
+                        customAttribute.NamedArguments.Select(b => (PropertyInfo)b.MemberInfo).ToArray(),
+                        customAttribute.NamedArguments.Select(b => b.TypedValue.Value).ToArray());
+                
+                prop.SetCustomAttribute(attributeBuilder);
+            }
+            
+            var getMethod = type.DefineMethod($"get_{field.Name}", MethodAttributes.Public | MethodAttributes.HideBySig, field.FieldType, Type.EmptyTypes);
+            {
+                var il = getMethod.GetILGenerator();
+                
+                il.Emit(OpCodes.Ldarg_0);
+                il.Emit(OpCodes.Ldfld, instanceField);
+                il.Emit(OpCodes.Ldfld, field);
+                il.Emit(OpCodes.Ret);
+            }
+            prop.SetGetMethod(getMethod);
+
+            if (field.IsInitOnly) continue;
+            
+            var setMethod = type.DefineMethod($"set_{field.Name}", MethodAttributes.Public | MethodAttributes.HideBySig, typeof(void),
+                    [field.FieldType]);
+            {
+                var il = setMethod.GetILGenerator();
+
+                il.Emit(OpCodes.Ldarg_0);
+                il.Emit(OpCodes.Dup);
+                il.Emit(OpCodes.Ldfld, instanceField);
+                il.Emit(OpCodes.Ldflda, field);
+                il.Emit(OpCodes.Ldarg_1);
+                il.Emit(OpCodes.Ldstr, field.Name);
+                il.Emit(OpCodes.Callvirt, viewModelSetMethod.MakeGenericMethod(field.FieldType));
+                il.Emit(OpCodes.Ret);
+            }
+                
+            prop.SetSetMethod(setMethod);
+        }
+        
+        proxy = type.CreateType();
+        
+        DynamicViewModel.Proxies[typeof(T)] = proxy;
+        
+        return (ViewModel)Activator.CreateInstance(proxy, obj);
+    }
+}
+
+file static class DynamicViewModel
+{
+    public static readonly Dictionary<Type, Type> Proxies = [];
+    [CanBeNull] public static ModuleBuilder ModuleBuilder;
+}