/**
* Headwords generator.
* @param string|\rhoone\extension\Extension|\rhoone\models\Extension|mixed $class
* `string` if extension class.
* @param string[] $words
* @throws InvalidParamException
*/
public function getHeadwords($class = null, $words = [])
{
// Method One:
if ($class === null || $class === false || is_string($class) && empty($class)) {
$query = Headword::find();
} else {
$extensions = ExtensionManager::getModels($class);
$guids = [];
foreach ($extensions as $extension) {
$guids[] = $extension->guid;
}
$query = Headword::find()->guid($guids);
}
if (is_array($words) && !empty($words)) {
$query = $query->word($words);
}
foreach ($query->all() as $headword) {
(yield $headword);
}
// Method Two:
//return Headword::find()->all();
}
