Method BindClass

Plugins/UnLua/Source/UnLua/Private/UnLuaManager.cpp:253–338

}

bool UUnLuaManager::BindClass(UClass* Class, const FString& InModuleName, FString& Error)
{
    check(Class);

    if (Class->HasAnyFlags(RF_NeedPostLoad | RF_NeedPostLoadSubobjects))
        return false;

    if (Classes.Contains(Class))
        return true;

    const auto  L = Env->GetMainState();
    const auto Top = lua_gettop(L);
    const auto Type = UnLua::LowLevel::GetLoadedModule(L, TCHAR_TO_UTF8(*InModuleName));
    if (Type != LUA_TTABLE)
    {
        Error = FString::Printf(TEXT("table needed got %s"), UTF8_TO_TCHAR(lua_typename(L, Type)));
        lua_settop(L, Top);
        return false;
    }

    if (!Class->IsChildOf<UBlueprintFunctionLibrary>())
    {
        // 一个LuaModule可能会被绑定到一个UClass和它的子类，复制一个出来作为它们的实例的元表
        lua_newtable(L);
        lua_pushnil(L);
        while (lua_next(L, -3) != 0)
        {
            lua_pushvalue(L, -2);
            lua_insert(L, -2);
            lua_settable(L, -4);
        }
    }

    lua_pushvalue(L, -1);
    const auto Ref = luaL_ref(L, LUA_REGISTRYINDEX);
    lua_settop(L, Top);

    auto& BindInfo = Classes.Add(Class);
    BindInfo.Class = Class;
    BindInfo.ModuleName = InModuleName;
    BindInfo.TableRef = Ref;

    UnLua::LowLevel::GetFunctionNames(Env->GetMainState(), Ref, BindInfo.LuaFunctions);
    ULuaFunction::GetOverridableFunctions(Class, BindInfo.UEFunctions);

    // 用LuaTable里所有的函数来替换Class上对应的UFunction
    for (const auto& LuaFuncName : BindInfo.LuaFunctions)
    {
        UFunction** Func = BindInfo.UEFunctions.Find(LuaFuncName);
        if (Func)
        {
            UFunction* Function = *Func;
            ULuaFunction::Override(Function, Class, LuaFuncName);
        }
    }

    if (BindInfo.LuaFunctions.Num() == 0 || BindInfo.UEFunctions.Num() == 0)
        return true;