class FilterNull in Drupal 9

Same name and namespace in other branches

8 core/modules/filter/src/Plugin/Filter/FilterNull.php \Drupal\filter\Plugin\Filter\FilterNull

Provides a fallback placeholder filter to use for missing filters.

The filter system uses this filter to replace missing filters (for example, if a filter module has been disabled) that are still part of defined text formats. It returns an empty string.

Plugin annotation


@Filter(
  id = "filter_null",
  title = @Translation("Provides a fallback for missing filters. Do not use."),
  type = Drupal\filter\Plugin\FilterInterface::TYPE_HTML_RESTRICTOR,
  weight = -10
)

Hierarchy

class \Drupal\Component\Plugin\PluginBase implements DerivativeInspectionInterface, PluginInspectionInterface
- class \Drupal\Core\Plugin\PluginBase uses DependencySerializationTrait, MessengerTrait, StringTranslationTrait
  - class \Drupal\filter\Plugin\FilterBase implements FilterInterface
    class \Drupal\filter\Plugin\Filter\FilterNull

Expanded class hierarchy of FilterNull

1 file declares its use of FilterNull

FilterFormatFormBase.php in core/modules/filter/src/FilterFormatFormBase.php

File

core/modules/filter/src/Plugin/Filter/FilterNull.php, line 22

Namespace

Drupal\filter\Plugin\Filter

View source

class FilterNull extends FilterBase {

  /**
   * Tracks if an alert about this filter has been logged.
   *
   * @var bool
   */
  protected $logged = FALSE;

  /**
   * {@inheritdoc}
   */
  public function __construct(array $configuration, $plugin_id, $plugin_definition) {

    // Once per filter, log that a filter plugin was missing.
    if (!$this->logged) {
      $this->logged = TRUE;
      \Drupal::logger('filter')
        ->alert('Missing filter plugin: %filter.', [
        '%filter' => $plugin_id,
      ]);
    }
    parent::__construct($configuration, $plugin_id, $plugin_definition);
  }

  /**
   * {@inheritdoc}
   */
  public function process($text, $langcode) {
    return new FilterProcessResult('');
  }

  /**
   * {@inheritdoc}
   */
  public function getHTMLRestrictions() {

    // Nothing is allowed.
    return [
      'allowed' => [],
    ];
  }

  /**
   * {@inheritdoc}
   */
  public function tips($long = FALSE) {
    return $this
      ->t('Missing filter. All text is removed');
  }

}

Members

Name	Modifiers	Type	Description	Overrides
DependencySerializationTrait::$_entityStorages	protected	property
DependencySerializationTrait::$_serviceIds	protected	property
DependencySerializationTrait::__sleep	public	function		2
DependencySerializationTrait::__wakeup	public	function		2
FilterBase::$provider	public	property	The name of the provider that owns this filter.
FilterBase::$settings	public	property	An associative array containing the configured settings of this filter.
FilterBase::$status	public	property	A Boolean indicating whether this filter is enabled.
FilterBase::$weight	public	property	The weight of this filter compared to others in a filter collection.
FilterBase::calculateDependencies	public	function	Calculates dependencies for the configured plugin. Overrides DependentPluginInterface::calculateDependencies	1
FilterBase::defaultConfiguration	public	function	Gets default configuration for this plugin. Overrides ConfigurableInterface::defaultConfiguration
FilterBase::getConfiguration	public	function	Gets this plugin's configuration. Overrides ConfigurableInterface::getConfiguration
FilterBase::getDescription	public	function	Returns the administrative description for this filter plugin. Overrides FilterInterface::getDescription
FilterBase::getLabel	public	function	Returns the administrative label for this filter plugin. Overrides FilterInterface::getLabel
FilterBase::getType	public	function	Returns the processing type of this filter plugin. Overrides FilterInterface::getType
FilterBase::prepare	public	function	Prepares the text for processing. Overrides FilterInterface::prepare
FilterBase::setConfiguration	public	function	Sets the configuration for this plugin instance. Overrides ConfigurableInterface::setConfiguration	1
FilterBase::settingsForm	public	function	Generates a filter's settings form. Overrides FilterInterface::settingsForm	3
FilterInterface::TYPE_HTML_RESTRICTOR		constant	HTML tag and attribute restricting filters to prevent XSS attacks.
FilterInterface::TYPE_MARKUP_LANGUAGE		constant	Non-HTML markup language filters that generate HTML.
FilterInterface::TYPE_TRANSFORM_IRREVERSIBLE		constant	Irreversible transformation filters.
FilterInterface::TYPE_TRANSFORM_REVERSIBLE		constant	Reversible transformation filters.
FilterNull::$logged	protected	property	Tracks if an alert about this filter has been logged.
FilterNull::getHTMLRestrictions	public	function	Returns HTML allowed by this filter's configuration. Overrides FilterBase::getHTMLRestrictions
FilterNull::process	public	function	Performs the filter processing. Overrides FilterInterface::process
FilterNull::tips	public	function	Generates a filter's tip. Overrides FilterBase::tips
FilterNull::__construct	public	function	Constructs a \Drupal\Component\Plugin\PluginBase object. Overrides FilterBase::__construct
MessengerTrait::$messenger	protected	property	The messenger.	27
MessengerTrait::messenger	public	function	Gets the messenger.	27
MessengerTrait::setMessenger	public	function	Sets the messenger.
PluginBase::$configuration	protected	property	Configuration information passed into the plugin.	1
PluginBase::$pluginDefinition	protected	property	The plugin implementation definition.	1
PluginBase::$pluginId	protected	property	The plugin_id.
PluginBase::DERIVATIVE_SEPARATOR		constant	A string which is used to separate base plugin IDs from the derivative ID.
PluginBase::getBaseId	public	function	Gets the base_plugin_id of the plugin instance. Overrides DerivativeInspectionInterface::getBaseId
PluginBase::getDerivativeId	public	function	Gets the derivative_id of the plugin instance. Overrides DerivativeInspectionInterface::getDerivativeId
PluginBase::getPluginDefinition	public	function	Gets the definition of the plugin implementation. Overrides PluginInspectionInterface::getPluginDefinition	2
PluginBase::getPluginId	public	function	Gets the plugin_id of the plugin instance. Overrides PluginInspectionInterface::getPluginId
PluginBase::isConfigurable	public	function	Determines if the plugin is configurable.
StringTranslationTrait::$stringTranslation	protected	property	The string translation service.	4
StringTranslationTrait::formatPlural	protected	function	Formats a string containing a count of items.
StringTranslationTrait::getNumberOfPlurals	protected	function	Returns the number of plurals supported by a given language.
StringTranslationTrait::getStringTranslation	protected	function	Gets the string translation service.
StringTranslationTrait::setStringTranslation	public	function	Sets the string translation service to use.	2
StringTranslationTrait::t	protected	function	Translates a string to the current language or to a given language.

You are here