function SourceEditing::getElementsSubset

Overrides CKEditor5PluginElementsSubsetInterface::getElementsSubset

File

core/modules/ckeditor5/src/Plugin/CKEditor5Plugin/SourceEditing.php, line 70

Class

SourceEditing

CKEditor 5 Source Editing plugin configuration.

Namespace

Code

public function getElementsSubset() : array {
    // Drupal needs to know which plugin can create a particular <tag>, and not
    // just a particular attribute on a tag: <tag attr>.
    // SourceEditing enables every tag a plugin lists, even if it's only there
    // to add support for an attribute. So, compute a list of only the tags.
    // F.e.: <foo attr>, <bar>, <baz bar> would result in <foo>, <bar>, <baz>.
    $r = HTMLRestrictions::fromString(implode(' ', $this->configuration['allowed_tags']));
    $plain_tags = $r->extractPlainTagsSubset()
        ->toCKEditor5ElementsArray();
    // Return the union of the "tags only" list and the original configuration,
    // but omit duplicates (the entries that were already "tags only").
    // F.e.: merging the tags only list of <foo>, <bar>, <baz> with the original
    // list of <foo attr>, <bar>, <baz bar> would result in <bar> having a
    // duplicate.
    $subset = array_unique(array_merge($plain_tags, $this->configuration['allowed_tags']));
    return $subset;
}