MachineName.php
Same filename in this branch
Same filename in other branches
- 9 core/modules/views/src/Plugin/views/field/MachineName.php
- 9 core/modules/migrate/src/Plugin/migrate/process/MachineName.php
- 9 core/lib/Drupal/Core/Render/Element/MachineName.php
- 8.9.x core/modules/views/src/Plugin/views/field/MachineName.php
- 8.9.x core/modules/migrate/src/Plugin/migrate/process/MachineName.php
- 8.9.x core/lib/Drupal/Core/Render/Element/MachineName.php
- 11.x core/modules/views/src/Plugin/views/field/MachineName.php
- 11.x core/modules/migrate/src/Plugin/migrate/process/MachineName.php
- 11.x core/lib/Drupal/Core/Render/Element/MachineName.php
Namespace
Drupal\Core\Render\ElementFile
-
core/
lib/ Drupal/ Core/ Render/ Element/ MachineName.php
View source
<?php
namespace Drupal\Core\Render\Element;
use Drupal\Component\Utility\NestedArray;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Language\LanguageInterface;
use Drupal\Core\Render\Attribute\FormElement;
/**
* Provides a machine name render element.
*
* Provides a form element to enter a machine name, which is validated to ensure
* that the name is unique and does not contain disallowed characters.
*
* The element may be automatically populated via JavaScript when used in
* conjunction with a separate "source" form element (typically specifying the
* human-readable name). As the user types text into the source element, the
* JavaScript converts all values to lower case, replaces any remaining
* disallowed characters with a replacement, and populates the associated
* machine name form element.
*
* Properties:
* - #machine_name: An associative array containing:
* - exists: A callable to invoke for checking whether a submitted machine
* name value already exists. The arguments passed to the callback will be:
* - The submitted value.
* - The element array.
* - The form state object.
* In most cases, an existing API or menu argument loader function can be
* re-used. The callback is only invoked if the submitted value differs from
* the element's initial #default_value. The initial #default_value is
* stored in form state so AJAX forms can be reliably validated.
* - source: (optional) The #array_parents of the form element containing the
* human-readable name (i.e., as contained in the $form structure) to use as
* source for the machine name. Defaults to ['label'].
* - label: (optional) Text to display as label for the machine name value
* after the human-readable name form element. Defaults to t('Machine name').
* - replace_pattern: (optional) A regular expression (without delimiters)
* matching disallowed characters in the machine name. Defaults to
* '[^a-z0-9_]+'.
* - replace: (optional) A character to replace disallowed characters in the
* machine name via JavaScript. Defaults to '_' (underscore). When using a
* different character, 'replace_pattern' needs to be set accordingly.
* - error: (optional) A custom form error message string to show, if the
* machine name contains disallowed characters.
* - standalone: (optional) Whether the live preview should stay in its own
* form element rather than in the suffix of the source element. The source
* element must appear in the form structure before this element. Defaults
* to FALSE.
* - #maxlength: (optional) Maximum allowed length of the machine name. Defaults
* to 64.
* - #disabled: (optional) Should be set to TRUE if an existing machine name
* must not be changed after initial creation.
*
* Usage example:
* @code
* $form['id'] = [
* '#type' => 'machine_name',
* '#default_value' => $this->entity->id(),
* '#disabled' => !$this->entity->isNew(),
* '#maxlength' => 64,
* '#description' => $this->t('A unique name for this item. It must only contain lowercase letters, numbers, and underscores.'),
* '#machine_name' => [
* 'exists' => [$this, 'exists'],
* ],
* ];
* @endcode
*
* @see \Drupal\Core\Render\Element\Textfield
*/
class MachineName extends Textfield {
/**
* {@inheritdoc}
*/
public function getInfo() {
$class = static::class;
return [
'#input' => TRUE,
'#default_value' => NULL,
'#required' => TRUE,
'#maxlength' => 64,
'#size' => 60,
'#autocomplete_route_name' => FALSE,
'#process' => [
[
$class,
'processMachineName',
],
[
$class,
'processAutocomplete',
],
[
$class,
'processAjaxForm',
],
],
'#element_validate' => [
[
$class,
'validateMachineName',
],
],
'#pre_render' => [
[
$class,
'preRenderTextfield',
],
],
'#theme' => 'input__textfield',
'#theme_wrappers' => [
'form_element',
],
];
}
/**
* {@inheritdoc}
*/
public static function valueCallback(&$element, $input, FormStateInterface $form_state) {
if ($input !== FALSE && $input !== NULL) {
// This should be a string, but allow other scalars since they might be
// valid input in programmatic form submissions.
return is_scalar($input) ? (string) $input : '';
}
return NULL;
}
/**
* Processes a machine-readable name form element.
*
* @param array $element
* The form element to process. See main class documentation for properties.
* @param \Drupal\Core\Form\FormStateInterface $form_state
* The current state of the form.
* @param array $complete_form
* The complete form structure.
*
* @return array
* The processed element.
*/
public static function processMachineName(&$element, FormStateInterface $form_state, &$complete_form) {
// We need to pass the langcode to the client.
$language = \Drupal::languageManager()->getCurrentLanguage();
// Apply default form element properties.
$element += [
'#title' => t('Machine-readable name'),
'#description' => t('A unique machine-readable name. Can only contain lowercase letters, numbers, and underscores.'),
'#machine_name' => [],
'#field_prefix' => '',
'#field_suffix' => '',
'#suffix' => '',
];
// A form element that only wants to set one #machine_name property (usually
// 'source' only) would leave all other properties undefined, if the defaults
// were defined by an element plugin. Therefore, we apply the defaults here.
$element['#machine_name'] += [
'source' => [
'label',
],
'target' => '#' . $element['#id'],
'label' => t('Machine name'),
'replace_pattern' => '[^a-z0-9_]+',
'replace' => '_',
'standalone' => FALSE,
'field_prefix' => $element['#field_prefix'],
'field_suffix' => $element['#field_suffix'],
];
// Store the initial value in form state. The machine name needs this to
// ensure that the exists function is not called for existing values when
// editing them.
$initial_values = $form_state->get('machine_name.initial_values') ?: [];
// Store the initial values in an array so we can differentiate between a
// NULL default value and a new machine name element.
if (!array_key_exists($element['#name'], $initial_values)) {
$initial_values[$element['#name']] = $element['#default_value'];
$form_state->set('machine_name.initial_values', $initial_values);
}
// By default, machine names are restricted to Latin alphanumeric characters.
// So, default to LTR directionality.
if (!isset($element['#attributes'])) {
$element['#attributes'] = [];
}
$element['#attributes'] += [
'dir' => LanguageInterface::DIRECTION_LTR,
];
// The source element defaults to ['name'], but may have been overridden.
if (empty($element['#machine_name']['source'])) {
return $element;
}
// Retrieve the form element containing the human-readable name from the
// complete form in $form_state. By reference, because we may need to append
// a #field_suffix that will hold the live preview.
$key_exists = NULL;
$source = NestedArray::getValue($form_state->getCompleteForm(), $element['#machine_name']['source'], $key_exists);
if (!$key_exists) {
return $element;
}
// The source element must be defined before the machine name element.
if (!isset($source['#id'])) {
$element_parents = implode('][', $element['#array_parents']);
$source_parents = implode('][', $element['#machine_name']['source']);
throw new \LogicException(sprintf('The machine name element "%s" is defined before the source element "%s", it must be defined after or the source element must specify an id.', $element_parents, $source_parents));
}
$suffix_id = $source['#id'] . '-machine-name-suffix';
$element['#machine_name']['suffix'] = '#' . $suffix_id;
if ($element['#machine_name']['standalone']) {
$element['#suffix'] = $element['#suffix'] . ' <small id="' . $suffix_id . '"> </small>';
}
else {
// Append a field suffix to the source form element, which will contain
// the live preview of the machine name.
$source += [
'#field_suffix' => '',
];
$source['#field_suffix'] = $source['#field_suffix'] . ' <small id="' . $suffix_id . '"> </small>';
$parents = array_merge($element['#machine_name']['source'], [
'#field_suffix',
]);
NestedArray::setValue($form_state->getCompleteForm(), $parents, $source['#field_suffix']);
}
$element['#attached']['library'][] = 'core/drupal.machine-name';
$options = [
'replace_pattern',
'replace_token',
'replace',
'maxlength',
'target',
'label',
'field_prefix',
'field_suffix',
'suffix',
];
/** @var \Drupal\Core\Access\CsrfTokenGenerator $token_generator */
$token_generator = \Drupal::service('csrf_token');
$element['#machine_name']['replace_token'] = $token_generator->get($element['#machine_name']['replace_pattern']);
$element['#attached']['drupalSettings']['machineName']['#' . $source['#id']] = array_intersect_key($element['#machine_name'], array_flip($options));
$element['#attached']['drupalSettings']['langcode'] = $language->getId();
$element['#attached']['drupalSettings']['transliteration_language_overrides'] = static::getTransliterationLanguageOverrides($language);
return $element;
}
/**
* Form element validation handler for machine_name elements.
*
* Note that #maxlength is validated by _form_validate() already.
*
* This checks that the submitted value:
* - Does not contain the replacement character only.
* - Does not contain disallowed characters.
* - Is unique; i.e., does not already exist.
* - Does not exceed the maximum length (via #maxlength).
* - Cannot be changed after creation (via #disabled).
*/
public static function validateMachineName(&$element, FormStateInterface $form_state, &$complete_form) {
// Verify that the machine name not only consists of replacement tokens.
if (preg_match('@^' . $element['#machine_name']['replace'] . '+$@', $element['#value'])) {
$form_state->setError($element, t('The machine-readable name must contain unique characters.'));
}
// Verify that the machine name contains no disallowed characters.
if (preg_match('@' . $element['#machine_name']['replace_pattern'] . '@', $element['#value'])) {
if (!isset($element['#machine_name']['error'])) {
// Since a hyphen is the most common alternative replacement character,
// a corresponding validation error message is supported here.
if ($element['#machine_name']['replace'] == '-') {
$form_state->setError($element, t('The machine-readable name must contain only lowercase letters, numbers, and hyphens.'));
}
else {
$form_state->setError($element, t('The machine-readable name must contain only lowercase letters, numbers, and underscores.'));
}
}
else {
$form_state->setError($element, $element['#machine_name']['error']);
}
}
// Verify that the machine name is unique. If the value matches the initial
// default value then it does not need to be validated as the machine name
// element assumes the form is editing the existing value.
$initial_values = $form_state->get('machine_name.initial_values') ?: [];
if (!array_key_exists($element['#name'], $initial_values) || $initial_values[$element['#name']] !== $element['#value']) {
$function = $element['#machine_name']['exists'];
if (call_user_func($function, $element['#value'], $element, $form_state)) {
$form_state->setError($element, t('The machine-readable name is already in use. It must be unique.'));
}
}
}
/**
* Gets transliteration language overrides for a language.
*
* This is duplicating
* \Drupal\Core\Transliteration\PhpTransliteration::readLanguageOverrides().
*
* @see \Drupal\Core\Transliteration\PhpTransliteration::readLanguageOverrides()
*/
private static function getTransliterationLanguageOverrides(LanguageInterface $language) {
$overrides =& drupal_static(__CLASS__ . '_' . __METHOD__, []);
$langcode = $language->getId();
if (isset($overrides[$langcode])) {
return $overrides[$langcode];
}
$file = dirname(__DIR__, 3) . '/Component/Transliteration/data' . '/' . preg_replace('/[^a-zA-Z\\-]/', '', $langcode) . '.php';
$overrides[$langcode] = [];
if (is_file($file)) {
include $file;
}
\Drupal::moduleHandler()->alter('transliteration_overrides', $overrides[$langcode], $langcode);
return [
$langcode => $overrides[$langcode],
];
}
}
Classes
Title | Deprecated | Summary |
---|---|---|
MachineName | Provides a machine name render element. |
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