Operator awareness of parent function? about interpreter HOT 6 CLOSED

ir.addFunction("lettuce", [&ir](const vector<string>& args) ->string {
      return !args.empty() ? args[0] : "";
  });

ir.addOperator( // a selection
    "->", [&ir](string &leftOpd, string &rightOpd) -> string {

    auto entities = ir.allEntities();

    auto curEntity = ir.currentEntity();

    int index = curEntity.beginIndex - 1;
    while ((index >= 0) && (entities[index].type != Interpreter::EntityType::FUNCTION))
        --index;

    string parentFunctionName = "";
    if (index >= 0)
        parentFunctionName = entities[index].name;

    if (isNumber(leftOpd) && isNumber(rightOpd)) {
        int a = stoi(leftOpd);
        int b = stoi(rightOpd);
        for (int cnt = a; cnt <= b; cnt++) {
            printf("select %s %d \n\r", parentFunctionName.c_str(), cnt);
        }
    }
    return parentFunctionName;
}, 0);

string scenar = "lettuce(1->24);";

string res = ir.cmd(scenar); // lettuce