private function parseSingle(&$i, $parameter, &$results)
    {
        if ($this->prefixExists($parameter)) {
            $closure = $this->getClosure($parameter);

            if ($closure != null) {
                $prefix = $this->getPrefix($parameter);
                $closure_arguments = [];
                $rFunction = new ReflectionFunction($closure);
                if ($rFunction->isVariadic()) {
                    $this->parseVariadicParameter(
                        $i,
                        $results,
                        $closure,
                        $closure_arguments,
                        $prefix,
                        $parameter
                    );
                } else {
                    $this->parseUniadicParameter(
                        $i,
                        $results,
                        $closure,
                        $closure_arguments,
                        $prefix,
                        $parameter,
                        $rFunction
                    );
                }

                $result_key = $this->getRealName($parameter);
                $result = $results[$result_key];

                if (! $result instanceof ParameterResult) {
                    if ($result == self::HALT_PARSE) {
                        $this->haltedBy = $this->getParameterClosure($parameter);
                        unset($results[$result_key]);

                        return false;
                    }
                } else {
                    if ($result->shouldHalt()) {
                        $this->haltedBy = $this->getParameterClosure($parameter);
                        if ($result->isHaltOnly()) {
                            unset($results[$result_key]);
                        } else {
                            $results[$result_key] = $result->getValue();
                        }

                        return false;
                    }
                }
            } else {
                $this->respondDefault($i, $results, $parameter);
            }
        } else {
            $this->respondDefault($i, $results, $parameter);
        }

        return true;
    }