# Copyright 2017 Neural Networks and Deep Learning lab, MIPT
#
# 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 typing import List, Union
from deeppavlov.core.common.registry import register
from deeppavlov.core.models.component import Component
[docs]@register('str_lower')
class StrLower(Component):
"""Component for converting strings to lowercase at any level of lists nesting
"""
def __init__(self, *args, **kwargs):
pass
[docs] def __call__(self, batch: Union[str, list, tuple]):
"""Recursively search for strings in a list and convert them to lowercase
Args:
batch: a string or a list containing strings at some level of nesting
Returns:
the same structure where all strings are converted to lowercase
"""
if isinstance(batch, (list, tuple)):
return [self(line) for line in batch]
else:
return batch.lower()