The CSRF token generator to validate the form token. Type:

public FormBuilderInterface::getForm($form_arg)

public FormStateDecoratorBase::disableCache()

Provides an interface for an object containing the current state of a form. This is passed to all form related code so that the caller can use

public FormState::setRebuild($rebuild = TRUE) Sets

public static FormStateDecoratorBase::hasAnyErrors()

public FormState::getFormObject() Returns

public FormState::isRebuilding() Determines

Builds an AJAX form response. Given the current request, a form render array, its form state, and any AJAX commands to apply to the form, build

public FormStateDecoratorBase::getLimitValidationErrors()