recursiveBuildPreliminaryFormTree example

$this->dataByView[$hash],
            $this->dataExtractor->extractViewVariables($view)
        );

        foreach ($view->children as $child) {
            $this->collectViewVariables($child);
        }
    }

    public function buildPreliminaryFormTree(FormInterface $form): void
    {
        $this->data['forms'][$form->getName()] = &$this->recursiveBuildPreliminaryFormTree($form, $this->data['forms_by_hash']);
    }

    public function buildFinalFormTree(FormInterface $form, FormView $view): void
    {
        $this->data['forms'][$form->getName()] = &$this->recursiveBuildFinalFormTree($form, $view, $this->data['forms_by_hash']);
    }

    public function getName(): string
    {
        return 'form';
    }