| /* |
| * Copyright (c) 2021, The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef CPP_TELEMETRY_SCRIPT_EXECUTOR_SRC_LUAENGINE_H_ |
| #define CPP_TELEMETRY_SCRIPT_EXECUTOR_SRC_LUAENGINE_H_ |
| |
| #include "ScriptExecutorListener.h" |
| |
| #include <memory> |
| |
| extern "C" { |
| #include "lua.h" |
| } |
| |
| namespace android { |
| namespace automotive { |
| namespace telemetry { |
| namespace script_executor { |
| |
| // Encapsulates Lua script execution environment. |
| class LuaEngine { |
| public: |
| LuaEngine(); |
| |
| virtual ~LuaEngine(); |
| |
| // Returns pointer to Lua state object. |
| lua_State* GetLuaState(); |
| |
| // Loads Lua script provided as scriptBody string. |
| // Returns 0 if successful. Otherwise returns non-zero Lua error code. |
| int LoadScript(const char* scriptBody); |
| |
| // Pushes a Lua function under provided name into the stack. |
| // Returns true if successful. |
| bool PushFunction(const char* functionName); |
| |
| // Invokes function with the inputs provided in the stack. |
| // Assumes that the script body has been already loaded and successully |
| // compiled and run, and all input arguments, and the function have been |
| // pushed to the stack. |
| // Returns 0 if successful. Otherwise returns non-zero Lua error code. |
| int Run(); |
| |
| // Updates stored listener and destroys the previous one. |
| void ResetListener(ScriptExecutorListener* listener); |
| |
| private: |
| lua_State* mLuaState; // owned |
| |
| std::unique_ptr<ScriptExecutorListener> mListener; |
| }; |
| |
| } // namespace script_executor |
| } // namespace telemetry |
| } // namespace automotive |
| } // namespace android |
| |
| #endif // CPP_TELEMETRY_SCRIPT_EXECUTOR_SRC_LUAENGINE_H_ |