
"""simple docstring"""


class 		lowerCamelCase__					:





			'''simple docstring'''







			class 		lowerCamelCase__					:





						'''simple docstring'''
						lowerCamelCase  					=		'''_prev''', '''_data''', '''_next'''



						def __init__(							self     ,     __UpperCAmelCase     ,     __UpperCAmelCase     ,     __UpperCAmelCase  ) ->     Tuple:
							_lowerCAmelCase								=link_p
							_lowerCAmelCase								=element
							_lowerCAmelCase								=link_n



						def 					_lowerCAmelCase		(							self  ) ->     Dict:
							return (
							    f''' Prev -> {self._prev is not None}, Next -> {self._next is not None}'''
							)







			def __init__(							self  ) ->     Union[str, Any]:
				_lowerCAmelCase								=self._Node(__UpperCAmelCase     ,     __UpperCAmelCase     ,     __UpperCAmelCase  )
				_lowerCAmelCase								=self._Node(__UpperCAmelCase     ,     __UpperCAmelCase     ,     __UpperCAmelCase  )
				_lowerCAmelCase								=self._trailer
				_lowerCAmelCase								=self._header
				_lowerCAmelCase								=0



			def __len__(							self  ) ->     Dict:
				return self._size



			def 					_lowerCAmelCase		(							self  ) ->     Optional[Any]:
				return self.__len__() == 0



			def 					_lowerCAmelCase		(							self     ,     __UpperCAmelCase     ,     __UpperCAmelCase     ,     __UpperCAmelCase  ) ->     Tuple:
				# Create new_node by setting it's prev.link -> header
				# setting it's next.link -> trailer
				_lowerCAmelCase								=self._Node(__UpperCAmelCase     ,     __UpperCAmelCase     ,     __UpperCAmelCase  )
				_lowerCAmelCase								=new_node
				_lowerCAmelCase								=new_node
				self._size += 1
				return self



			def 					_lowerCAmelCase		(							self     ,     __UpperCAmelCase  ) ->     Union[str, Any]:
				_lowerCAmelCase								=node._prev
				_lowerCAmelCase								=node._next

				_lowerCAmelCase								=successor
				_lowerCAmelCase								=predecessor
				self._size -= 1
				_lowerCAmelCase								=node._data
				_lowerCAmelCase								=_lowerCAmelCase								=_lowerCAmelCase								=None
				del node
				return temp







class 		lowerCamelCase__					(					_DoublyLinkedBase				):





			'''simple docstring'''



			def 					_lowerCAmelCase		(							self  ) ->     Optional[Any]:
				if self.is_empty():
					raise Exception("""List is empty"""  )
				return self._header._next._data



			def 					_lowerCAmelCase		(							self  ) ->     int:
				if self.is_empty():
					raise Exception("""List is empty"""  )
				return self._trailer._prev._data



			def 					_lowerCAmelCase		(							self     ,     __UpperCAmelCase  ) ->     Dict:
				return self._insert(self._header     ,     __UpperCAmelCase     ,     self._header._next  )



			def 					_lowerCAmelCase		(							self     ,     __UpperCAmelCase  ) ->     List[Any]:
				return self._insert(self._trailer._prev     ,     __UpperCAmelCase     ,     self._trailer  )



			def 					_lowerCAmelCase		(							self  ) ->     Dict:
				if self.is_empty():
					raise IndexError("""remove_first from empty list"""  )
				return self._delete(self._header._next  )



			def 					_lowerCAmelCase		(							self  ) ->     List[str]:
				if self.is_empty():
					raise IndexError("""remove_first from empty list"""  )
				return self._delete(self._trailer._prev  )





"""simple docstring"""


from typing import TYPE_CHECKING

from ...utils import OptionalDependencyNotAvailable, _LazyModule, is_sentencepiece_available, is_torch_available


__A       						=       {'configuration_bert_generation': ['BertGenerationConfig']}

try:
			if not is_sentencepiece_available():
						raise OptionalDependencyNotAvailable()
except OptionalDependencyNotAvailable:
			pass
else:
			__A       						=       ['BertGenerationTokenizer']

try:
			if not is_torch_available():
						raise OptionalDependencyNotAvailable()
except OptionalDependencyNotAvailable:
			pass
else:
			__A       						=       [
			    'BertGenerationDecoder',
			    'BertGenerationEncoder',
			    'BertGenerationPreTrainedModel',
			    'load_tf_weights_in_bert_generation',
			]


if TYPE_CHECKING:
			from .configuration_bert_generation import BertGenerationConfig

			try:
						if not is_sentencepiece_available():
									raise OptionalDependencyNotAvailable()
			except OptionalDependencyNotAvailable:
						pass
			else:
						from .tokenization_bert_generation import BertGenerationTokenizer

			try:
						if not is_torch_available():
									raise OptionalDependencyNotAvailable()
			except OptionalDependencyNotAvailable:
						pass
			else:
						from .modeling_bert_generation import (
						    BertGenerationDecoder,
						    BertGenerationEncoder,
						    BertGenerationPreTrainedModel,
						    load_tf_weights_in_bert_generation,
						)

else:
			import sys

			__A       						=       _LazyModule(__name__, globals()['__file__'], _import_structure, module_spec=__spec__)



