# Copyright 2021, 2022 Cambridge Quantum Computing Ltd.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from __future__ import annotations

from typing import List, Union

SentenceType = Union[str, List[str]]
SentenceBatchType = Union[List[str], List[List[str]]]


def tokenised_sentence_type_check(sentence: SentenceType) -> bool:
    return isinstance(sentence, list) and all(
            isinstance(token, str) for token in sentence)


def untokenised_batch_type_check(sentence: SentenceBatchType) -> bool:
    return isinstance(sentence, list) and all(
            isinstance(token, str) for token in sentence)


def tokenised_batch_type_check(batch: SentenceBatchType) -> bool:
    return isinstance(batch, list) and all(
            tokenised_sentence_type_check(s) for s in batch)
