






"""simple docstring"""





from typing import TYPE_CHECKING

from ...utils import OptionalDependencyNotAvailable, _LazyModule, is_torch_available


UpperCamelCase					=     {"""configuration_sew_d""": ["""SEW_D_PRETRAINED_CONFIG_ARCHIVE_MAP""", """SEWDConfig"""]}

try:
  if not is_torch_available():
    raise OptionalDependencyNotAvailable()
except OptionalDependencyNotAvailable:
  pass
else:
  UpperCamelCase					=     [
      """SEW_D_PRETRAINED_MODEL_ARCHIVE_LIST""",
      """SEWDForCTC""",
      """SEWDForSequenceClassification""",
      """SEWDModel""",
      """SEWDPreTrainedModel""",
  ]

if TYPE_CHECKING:
  from .configuration_sew_d import SEW_D_PRETRAINED_CONFIG_ARCHIVE_MAP, SEWDConfig

  try:
    if not is_torch_available():
      raise OptionalDependencyNotAvailable()
  except OptionalDependencyNotAvailable:
    pass
  else:
    from .modeling_sew_d import (
        SEW_D_PRETRAINED_MODEL_ARCHIVE_LIST,
        SEWDForCTC,
        SEWDForSequenceClassification,
        SEWDModel,
        SEWDPreTrainedModel,
    )


else:
  import sys

  UpperCamelCase					=     _LazyModule(__name__, globals()["""__file__"""], _import_structure, module_spec=__spec__)










'''simple docstring'''




class 			lowerCAmelCase					:



	def __init__(       self			,       snake_case__     ):
		lowerCAmelCase       :     Dict   				=			data
		lowerCAmelCase       :     Dict   				=			None
		lowerCAmelCase       :     Optional[int]   				=			None



	def __str__(       self     ):
		return f"{self.data}"



class 			lowerCAmelCase					:



	def __init__(       self     ):
		lowerCAmelCase       :     int   				=			None
		lowerCAmelCase       :     Dict   				=			None



	def __iter__(       self     ):
		lowerCAmelCase       :     Any   				=			self.head
		while node:
			yield node.data
			lowerCAmelCase       :     Tuple   				=			node.next



	def __str__(       self     ):
		return "->".join([str(snake_case__     ) for item in self]     )



	def __len__(       self     ):
		return sum(1 for _ in self     )



	def 					lowercase  (       self			,       snake_case__     ):
		self.insert_at_nth(0			,       snake_case__     )



	def 					lowercase  (       self			,       snake_case__     ):
		self.insert_at_nth(len(self     )			,       snake_case__     )



	def 					lowercase  (       self			,       snake_case__			,       snake_case__     ):
		lowerCAmelCase       :     Dict   				=			len(self     )

		if not 0 <= index <= length:
			raise IndexError('list index out of range'     )
		lowerCAmelCase       :     Dict   				=			Node(snake_case__     )
		if self.head is None:
			lowerCAmelCase       :     Any   				=			new_node
		elif index == 0:
			lowerCAmelCase       :     Dict   				=			new_node
			lowerCAmelCase       :     List[str]   				=			self.head
			lowerCAmelCase       :     Any   				=			new_node
		elif index == length:
			lowerCAmelCase       :     List[str]   				=			new_node
			lowerCAmelCase       :     int   				=			self.tail
			lowerCAmelCase       :     List[str]   				=			new_node
		else:
			lowerCAmelCase       :     Optional[Any]   				=			self.head
			for _ in range(0			,       snake_case__     ):
				lowerCAmelCase       :     Dict   				=			temp.next
			lowerCAmelCase       :     Tuple   				=			new_node
			lowerCAmelCase       :     Union[str, Any]   				=			temp.previous
			lowerCAmelCase       :     int   				=			temp
			lowerCAmelCase       :     Optional[int]   				=			new_node



	def 					lowercase  (       self     ):
		return self.delete_at_nth(0     )



	def 					lowercase  (       self     ):
		return self.delete_at_nth(len(self     ) - 1     )



	def 					lowercase  (       self			,       snake_case__     ):
		lowerCAmelCase       :     Optional[Any]   				=			len(self     )

		if not 0 <= index <= length - 1:
			raise IndexError('list index out of range'     )
		lowerCAmelCase       :     List[Any]   				=			self.head  # default first node
		if length == 1:
			lowerCAmelCase       :     int   				=			None
		elif index == 0:
			lowerCAmelCase       :     str   				=			self.head.next
			lowerCAmelCase       :     Dict   				=			None
		elif index == length - 1:
			lowerCAmelCase       :     int   				=			self.tail
			lowerCAmelCase       :     Dict   				=			self.tail.previous
			lowerCAmelCase       :     str   				=			None
		else:
			lowerCAmelCase       :     str   				=			self.head
			for _ in range(0			,       snake_case__     ):
				lowerCAmelCase       :     Dict   				=			temp.next
			lowerCAmelCase       :     Tuple   				=			temp
			lowerCAmelCase       :     List[str]   				=			temp.previous
			lowerCAmelCase       :     Tuple   				=			temp.next
		return delete_node.data



	def 					lowercase  (       self			,       snake_case__     ):
		lowerCAmelCase       :     Dict   				=			self.head

		while current.data != data:  # Find the position to delete
			if current.next:
				lowerCAmelCase       :     str   				=			current.next
			else:  # We have reached the end an no value matches
				raise ValueError('No data matching given value'     )

		if current == self.head:
			self.delete_head()

		elif current == self.tail:
			self.delete_tail()

		else:  # Before: 1 <--> 2(current) <--> 3
			lowerCAmelCase       :     Optional[Any]   				=			current.next  # 1 --> 3
			lowerCAmelCase       :     str   				=			current.previous  # 1 <--> 3
		return data



	def 					lowercase  (       self     ):
		return len(self     ) == 0


def       __UpperCamelCase     (     )     ->   None:




	"""simple docstring"""





	lowerCAmelCase       :     str   				=			DoublyLinkedList()
	assert linked_list.is_empty() is True
	assert str(_A					) == ""

	try:
		linked_list.delete_head()
		raise AssertionError  # This should not happen.
	except IndexError:
		assert True  # This should happen.

	try:
		linked_list.delete_tail()
		raise AssertionError  # This should not happen.
	except IndexError:
		assert True  # This should happen.

	for i in range(10					):
		assert len(_A					) == i
		linked_list.insert_at_nth(_A       , i + 1					)
	assert str(_A					) == "->".join(str(_A					) for i in range(1       , 11					)					)

	linked_list.insert_at_head(0					)
	linked_list.insert_at_tail(11					)
	assert str(_A					) == "->".join(str(_A					) for i in range(0       , 12					)					)

	assert linked_list.delete_head() == 0
	assert linked_list.delete_at_nth(9					) == 10
	assert linked_list.delete_tail() == 11
	assert len(_A					) == 9
	assert str(_A					) == "->".join(str(_A					) for i in range(1       , 10					)					)


if __name__ == "__main__":
				from doctest import testmod

				testmod()
