function FormBuilder::getFormId

File

core/lib/Drupal/Core/Form/FormBuilder.php, line 191

Class

FormBuilder

Provides form building and processing.

Namespace

Code

public function getFormId($form_arg, FormStateInterface &$form_state) {
    // If the $form_arg is the name of a class, instantiate it. Don't allow
    // arbitrary strings to be passed to the class resolver.
    if (is_string($form_arg) && class_exists($form_arg)) {
        $form_arg = $this->classResolver
            ->getInstanceFromDefinition($form_arg);
    }
    if (!is_object($form_arg)) {
        throw new \InvalidArgumentException("The form class {$form_arg} could not be found or loaded.");
    }
    elseif (!$form_arg instanceof FormInterface) {
        throw new \InvalidArgumentException('The form argument ' . $form_arg::class . ' must be an instance of \\Drupal\\Core\\Form\\FormInterface.');
    }
    // Add the $form_arg as the callback object and determine the form ID.
    $form_state->setFormObject($form_arg);
    if ($form_arg instanceof BaseFormIdInterface) {
        $form_state->addBuildInfo('base_form_id', $form_arg->getBaseFormId());
    }
    return $form_arg->getFormId();
}