Method definesMqttFunction

app/src/MQTT/PublisherScriptEditor.cpp:539–584

* @brief Returns true if the code defines a callable mqtt() global. */

 * @brief Returns true if the code defines a callable mqtt() global.
 */
bool MQTT::PublisherScriptEditor::definesMqttFunction(const QString& code, int language)
{
  if (code.trimmed().isEmpty())
    return false;

  if (language == SerialStudio::Lua) {
    lua_State* L = luaL_newstate();
    if (!L)
      return false;

    static const luaL_Reg kSafeLibs[] = {
      {    "_G",   luaopen_base},
      { "table",  luaopen_table},
      {"string", luaopen_string},
      {  "math",   luaopen_math},
      { nullptr,        nullptr}
    };

    for (const luaL_Reg* lib = kSafeLibs; lib->func; ++lib) {
      luaL_requiref(L, lib->name, lib->func, 1);
      lua_pop(L, 1);
    }

    DataModel::installLuaCompat(L);

    const QByteArray utf8 = code.toUtf8();
    if (luaL_dostring(L, utf8.constData()) != LUA_OK) {
      lua_close(L);
      return false;
    }

    lua_getglobal(L, "mqtt");
    const bool hasFn = lua_isfunction(L, -1);
    lua_close(L);
    return hasFn;
  }

  QJSEngine jsEngine;
  jsEngine.installExtensions(QJSEngine::ConsoleExtension | QJSEngine::GarbageCollectionExtension);
  const auto evalResult = jsEngine.evaluate(code);
  if (evalResult.isError())
    return false;

  const auto fn = jsEngine.globalObject().property(QStringLiteral("mqtt"));
  return fn.isCallable();
}

/**
 * @brief Returns the template index matching the editor text, or -1.