Method compile

app/src/MQTT/PublisherScript.cpp:72–144

* @brief Compiles the user script in the chosen language. */

 * @brief Compiles the user script in the chosen language.
 */
bool MQTT::PublisherScript::compile(const QString& source, int language, QString& errorOut)
{
  m_loaded   = false;
  m_language = language;

  if (source.trimmed().isEmpty()) {
    errorOut = QStringLiteral("Script is empty.");
    return false;
  }

  if (language == Lua) {
    destroyLua();
    resetJs();

    m_luaState = luaL_newstate();
    if (!m_luaState) {
      errorOut = QStringLiteral("Failed to create Lua state.");
      return false;
    }

    openSafeLibs(m_luaState);
    DataModel::installLuaCompat(m_luaState);

    const QByteArray utf8 = source.toUtf8();
    if (luaL_dostring(m_luaState, utf8.constData()) != LUA_OK) {
      errorOut = QString::fromUtf8(lua_tostring(m_luaState, -1));
      destroyLua();
      return false;
    }

    lua_getglobal(m_luaState, "mqtt");
    const bool hasFn = lua_isfunction(m_luaState, -1);
    lua_pop(m_luaState, 1);
    if (!hasFn) {
      errorOut = QStringLiteral("Script must define a function named 'mqtt(frame)'.");
      destroyLua();
      return false;
    }

    m_loaded = true;
    return true;
  }

  destroyLua();
  if (!m_jsEngine) {
    m_jsEngine = std::make_unique<QJSEngine>();
    m_jsEngine->installExtensions(QJSEngine::ConsoleExtension
                                  | QJSEngine::GarbageCollectionExtension);
    m_jsWatchdog = std::make_unique<DataModel::JsWatchdog>(
      m_jsEngine.get(), kRuntimeWatchdogMs, QStringLiteral("MQTT script"));
  }

  m_jsFunction = QJSValue();

  const QString wrapped = QStringLiteral("(function(){\n%1\n})();").arg(source);
  const auto result     = m_jsEngine->evaluate(wrapped, QStringLiteral("mqtt-script.js"));
  if (result.isError()) {
    errorOut = QStringLiteral("Line %1: %2")