def whitespace(self):
        token = self.next(False)
        if (token):
            if (token.isWhitespace()):
                return token
            self.restore(token)
        return None
List all folders or all subfolders of a folder.
dataset/ETHPy150Open tabatkins/bikeshed/bikeshed/widlparser/widlparser/tokenizer.py/Tokenizer.whitespace--crossover with--dataset/ETHPy150Open dossier/dossier.models/dossier/models/query.py/list_projects