interface FilterFormatInterface

interface FilterFormatInterface extends ConfigEntityInterface {
    
    /**
     * Returns the ordered collection of filter plugin instances or an individual plugin instance.
     *
     * @param string $instance_id
     *   (optional) The ID of a filter plugin instance to return.
     *
     * @return \Drupal\filter\FilterPluginCollection|\Drupal\filter\Plugin\FilterInterface
     *   Either the filter collection or a specific filter plugin instance.
     */
    public function filters($instance_id = NULL);
    
    /**
     * Sets the configuration for a filter plugin instance.
     *
     * Sets or replaces the configuration of a filter plugin in $this->filters,
     * and if instantiated already, also ensures that the actual filter plugin on
     * the FilterPluginCollection contains the identical configuration.
     *
     * @param string $instance_id
     *   The ID of a filter plugin to set the configuration for.
     * @param array $configuration
     *   The filter plugin configuration to set.
     */
    public function setFilterConfig($instance_id, array $configuration);
    
    /**
     * Returns if this format is the fallback format.
     *
     * The fallback format can never be disabled. It must always be available.
     *
     * @return bool
     *   TRUE if this format is the fallback format, FALSE otherwise.
     */
    public function isFallbackFormat();
    
    /**
     * Returns the machine-readable permission name for the text format.
     *
     * @return string|bool
     *   The machine-readable permission name, or FALSE if the text format is
     *   malformed or is the fallback format (which is available to all users).
     */
    public function getPermissionName();
    
    /**
     * Retrieves all filter types that are used in the text format.
     *
     * @return array
     *   All filter types used by filters of the text format.
     */
    public function getFilterTypes();
    
    /**
     * Retrieve all HTML restrictions (tags and attributes) for the text format.
     *
     * Note that restrictions applied to the "*" tag (the wildcard tag, i.e. all
     * tags) are treated just like any other HTML tag. That means that any
     * restrictions applied to it are not automatically applied to all other tags.
     * It is up to the caller to handle this in whatever way it sees fit; this way
     * no information granularity is lost.
     *
     * @return array|false
     *   A structured array as returned by FilterInterface::getHTMLRestrictions(),
     *   but with the intersection of all filters in this text format. The
     *   restrictions will either forbid or allow a list of tags. In the latter
     *   case, it's possible that restrictions on attributes are also stored.
     *   FALSE means there are no HTML restrictions.
     */
    public function getHtmlRestrictions();
    
    /**
     * Removes a filter.
     *
     * @param string $instance_id
     *   The ID of a filter plugin to be removed.
     */
    public function removeFilter($instance_id);

}