/**
* Checks if a field lookup key is translated. This will be TRUE unless one
* of the following conditions applies:
*
* - The key is the Drupal\Core\Language\Language::LANGCODE_NOT_SPECIFIED
* constant.
* - The key is the LANGUAGE_NONE constant from Drupal 7.
* - The key is the string 'und'.
*
* @param Node $key
* The key to check.
*
* @return boolean
*/
public static function isTranslation(Node $key)
{
if ($key instanceof ClassConstantLookupNode) {
$constant = $key->getClassName() . '::' . $key->getConstantName();
return $constant != '\\Drupal\\Core\\Language\\Language::LANGCODE_NOT_SPECIFIED';
} elseif ($key instanceof ConstantNode) {
return $key->getConstantName() != 'LANGUAGE_NONE';
} elseif ($key instanceof StringNode) {
return $key->toValue() != 'und';
} else {
return TRUE;
}
}
