Where is code for `form_widget()` Twig function?

Question

I went looking to see how Symfony's extended Twig function form_widget actually works. I was expecting to find the function in symfony / src / Symfony / Bridge / Twig / Extension / FormExtension.php . It's added to the function list there:

public function getFunctions()
{
    return array(

...
        new \Twig_SimpleFunction('form_widget', null, array('node_class' => 'Symfony\Bridge\Twig\Node\SearchAndRenderBlockNode', 'is_safe' => array('html'))),

...
    );
}

But no callable is listed (ie the 2nd arg is null). So what code is called when I use form_widget(a_form_element) in a Twig template?

Did you ever figure this out? Looking for it myself as a starting point for a table widget I want to create — Andy

cg. cg. · Accepted Answer · 2016-06-14T08:20:59

My answer is a little late but I just happened to investigate the same question. This is what I found:

The code which is called when you use form_widget() is that produced directly by the SearchAndRenderBlockNode class when your template is compiled. The compiled template code then results in a call to Symfony\Component\Form\FormRenderer::searchAndRenderBlock() where the proper Twig block is located, provided with context, and rendered.

Where is code for `form_widget()` Twig function?

4 Answers