/**
* Builds the "format_tags" configuration part of the CKEditor JS settings.
*
* @see getConfig()
*
* @param \Drupal\editor\Entity\Editor $editor
* A configured text editor object.
*
* @return array
* An array containing the "format_tags" configuration.
*/
protected function generateFormatTagsSetting(Editor $editor)
{
// When no text format is associated yet, assume no tag is allowed.
// @see \Drupal\Editor\EditorInterface::hasAssociatedFilterFormat()
if (!$editor->hasAssociatedFilterFormat()) {
return array();
}
$format = $editor->getFilterFormat();
$cid = 'ckeditor_internal_format_tags:' . $format->id();
if ($cached = $this->cache->get($cid)) {
$format_tags = $cached->data;
} else {
// The <p> tag is always allowed — HTML without <p> tags is nonsensical.
$format_tags = ['p'];
// Given the list of possible format tags, automatically determine whether
// the current text format allows this tag, and thus whether it should show
// up in the "Format" dropdown.
$possible_format_tags = ['h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'pre'];
foreach ($possible_format_tags as $tag) {
$input = '<' . $tag . '>TEST</' . $tag . '>';
$output = trim(check_markup($input, $editor->id()));
if ($input == $output) {
$format_tags[] = $tag;
}
}
$format_tags = implode(';', $format_tags);
// Cache the "format_tags" configuration. This cache item is infinitely
// valid; it only changes whenever the text format is changed, hence it's
// tagged with the text format's cache tag.
$this->cache->set($cid, $format_tags, Cache::PERMANENT, $format->getCacheTags());
}
return $format_tags;
}