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<?php
namespace Drupal\Core\Form;
/**
* Provides an interface for validating form submissions.
*/
interface FormValidatorInterface {
/**
* Executes custom validation handlers for a given form.
*
* Button-specific handlers are checked first. If none exist, the function
* falls back to form-level handlers.
*
* @param $form
* An associative array containing the structure of the form.
* @param $form_state
* The current state of the form. If the user submitted the form by clicking
* a button with custom handler functions defined, those handlers will be
* stored here.
*/
public function executeValidateHandlers(&$form, FormStateInterface &$form_state);
/**
* Validates user-submitted form data in the $form_state.
*
* @param $form_id
* A unique string identifying the form for validation, submission,
* theming, and hook_form_alter functions.
* @param $form
* An associative array containing the structure of the form, which is
* passed by reference. Form validation handlers are able to alter the form
* structure (like #process and #after_build callbacks during form building)
* in case of a validation error. If a validation handler alters the form
* structure, it is responsible for validating the values of changed form
* elements in $form_state->getValues() to prevent form submit handlers from
* receiving unvalidated values.
* @param $form_state
* The current state of the form. The current user-submitted data is stored
* in $form_state->getValues(), though form validation functions are passed
* an explicit copy of the values for the sake of simplicity. Validation
* handlers can also use $form_state to pass information on to submit
* handlers. For example:
* $form_state->set('data_for_submission', $data);
* This technique is useful when validation requires file parsing,
* web service requests, or other expensive requests that should
* not be repeated in the submission step.
*/
public function validateForm($form_id, &$form, FormStateInterface &$form_state);
/**
* Sets a form_token error on the given form state.
*
* @param \Drupal\Core\Form\FormStateInterface $form_state
* The current state of the form.
*
* @return $this
*/
public function setInvalidTokenError(FormStateInterface $form_state);
}