from typing import TYPE_CHECKING

from ...utils import (
    OptionalDependencyNotAvailable,
    _LazyModule,
    is_flax_available,
    is_tf_available,
    is_torch_available,
)


__lowerCamelCase    :				Tuple							     =	{
    '''configuration_vision_encoder_decoder''': ['''VisionEncoderDecoderConfig''', '''VisionEncoderDecoderOnnxConfig''']
}

try:
   if not is_torch_available():
      raise OptionalDependencyNotAvailable()
except OptionalDependencyNotAvailable:
   pass
else:
   __lowerCamelCase    :				Tuple							     =	['''VisionEncoderDecoderModel''']

try:
   if not is_tf_available():
      raise OptionalDependencyNotAvailable()
except OptionalDependencyNotAvailable:
   pass
else:
   __lowerCamelCase    :				Any							     =	['''TFVisionEncoderDecoderModel''']

try:
   if not is_flax_available():
      raise OptionalDependencyNotAvailable()
except OptionalDependencyNotAvailable:
   pass
else:
   __lowerCamelCase    :				List[str]							     =	['''FlaxVisionEncoderDecoderModel''']

if TYPE_CHECKING:
   from .configuration_vision_encoder_decoder import VisionEncoderDecoderConfig, VisionEncoderDecoderOnnxConfig

   try:
      if not is_torch_available():
         raise OptionalDependencyNotAvailable()
   except OptionalDependencyNotAvailable:
      pass
   else:
      from .modeling_vision_encoder_decoder import VisionEncoderDecoderModel

   try:
      if not is_tf_available():
         raise OptionalDependencyNotAvailable()
   except OptionalDependencyNotAvailable:
      pass
   else:
      from .modeling_tf_vision_encoder_decoder import TFVisionEncoderDecoderModel

   try:
      if not is_flax_available():
         raise OptionalDependencyNotAvailable()
   except OptionalDependencyNotAvailable:
      pass
   else:
      from .modeling_flax_vision_encoder_decoder import FlaxVisionEncoderDecoderModel

else:
   import sys

   __lowerCamelCase    :				List[Any]							     =	_LazyModule(__name__, globals()['''__file__'''], _import_structure, module_spec=__spec__)

from __future__ import annotations

from collections.abc import Iterator
from typing import Any







class __snake_case       :




   def __init__(					self    :       Union[str, Any] ,			_lowercase    :       Any   ):



     """simple docstring"""






     SCREAMING_SNAKE_CASE__    							=   data
     SCREAMING_SNAKE_CASE__    							=   None







class __snake_case       :




   def __init__(					self    :       List[Any]   ):



     """simple docstring"""






     SCREAMING_SNAKE_CASE__    							=   None
     SCREAMING_SNAKE_CASE__    							=   None




   def __iter__(					self    :       Tuple   ):



     """simple docstring"""






     SCREAMING_SNAKE_CASE__    							=   self.head
     while self.head:
       yield node.data
       SCREAMING_SNAKE_CASE__    							=   node.next
       if node == self.head:
         break




   def __len__(					self    :       int   ):



     """simple docstring"""






     return sum(1 for _ in self   )




   def __repr__(					self    :       Optional[int]   ):



     """simple docstring"""






     return "->".join(str(_lowercase   ) for item in iter(self   )   )




   def 			__a		(					self    :       Optional[int] ,			_lowercase    :       Any   ):



     """simple docstring"""






     self.insert_nth(len(self   ) ,			_lowercase   )




   def 			__a		(					self    :       Tuple ,			_lowercase    :       Any   ):



     """simple docstring"""






     self.insert_nth(0 ,			_lowercase   )




   def 			__a		(					self    :       Tuple ,			_lowercase    :       int ,			_lowercase    :       Any   ):



     """simple docstring"""






     if index < 0 or index > len(self   ):
       raise IndexError("""list index out of range."""   )
     SCREAMING_SNAKE_CASE__    							=   Node(_lowercase   )
     if self.head is None:
       SCREAMING_SNAKE_CASE__    							=   new_node  # first node points itself
       SCREAMING_SNAKE_CASE__    							=   SCREAMING_SNAKE_CASE__    							=   new_node
     elif index == 0:  # insert at head
       SCREAMING_SNAKE_CASE__    							=   self.head
       SCREAMING_SNAKE_CASE__    							=   SCREAMING_SNAKE_CASE__    							=   new_node
     else:
       SCREAMING_SNAKE_CASE__    							=   self.head
       for _ in range(index - 1   ):
         SCREAMING_SNAKE_CASE__    							=   temp.next
       SCREAMING_SNAKE_CASE__    							=   temp.next
       SCREAMING_SNAKE_CASE__    							=   new_node
       if index == len(self   ) - 1:  # insert at tail
         SCREAMING_SNAKE_CASE__    							=   new_node




   def 			__a		(					self    :       Dict   ):



     """simple docstring"""






     return self.delete_nth(0   )




   def 			__a		(					self    :       str   ):



     """simple docstring"""






     return self.delete_nth(len(self   ) - 1   )




   def 			__a		(					self    :       str ,			_lowercase    :       int = 0   ):



     """simple docstring"""






     if not 0 <= index < len(self   ):
       raise IndexError("""list index out of range."""   )
     SCREAMING_SNAKE_CASE__    							=   self.head
     if self.head == self.tail:  # just one node
       SCREAMING_SNAKE_CASE__    							=   SCREAMING_SNAKE_CASE__    							=   None
     elif index == 0:  # delete head node
       SCREAMING_SNAKE_CASE__    							=   self.tail.next.next
       SCREAMING_SNAKE_CASE__    							=   self.head.next
     else:
       SCREAMING_SNAKE_CASE__    							=   self.head
       for _ in range(index - 1   ):
         SCREAMING_SNAKE_CASE__    							=   temp.next
       SCREAMING_SNAKE_CASE__    							=   temp.next
       SCREAMING_SNAKE_CASE__    							=   temp.next.next
       if index == len(self   ) - 1:  # delete at tail
         SCREAMING_SNAKE_CASE__    							=   temp
     return delete_node.data




   def 			__a		(					self    :       Optional[int]   ):



     """simple docstring"""






     return len(self   ) == 0





def 			__SCREAMING_SNAKE_CASE						(      )							->      None:







  """simple docstring"""





  SCREAMING_SNAKE_CASE__    							=   CircularLinkedList()
  assert len(__UpperCamelCase			) == 0
  assert circular_linked_list.is_empty() is True
  assert str(__UpperCamelCase			) == ""

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

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

  try:
    circular_linked_list.delete_nth(-1			)
    raise AssertionError
  except IndexError:
    assert True

  try:
    circular_linked_list.delete_nth(0			)
    raise AssertionError
  except IndexError:
    assert True

  assert circular_linked_list.is_empty() is True
  for i in range(5			):
    assert len(__UpperCamelCase			) == i
    circular_linked_list.insert_nth(__UpperCamelCase				,  i + 1			)
  assert str(__UpperCamelCase			) == "->".join(str(__UpperCamelCase			) for i in range(1				,  6			)			)

  circular_linked_list.insert_tail(6			)
  assert str(__UpperCamelCase			) == "->".join(str(__UpperCamelCase			) for i in range(1				,  7			)			)
  circular_linked_list.insert_head(0			)
  assert str(__UpperCamelCase			) == "->".join(str(__UpperCamelCase			) for i in range(0				,  7			)			)

  assert circular_linked_list.delete_front() == 0
  assert circular_linked_list.delete_tail() == 6
  assert str(__UpperCamelCase			) == "->".join(str(__UpperCamelCase			) for i in range(1				,  6			)			)
  assert circular_linked_list.delete_nth(2			) == 3

  circular_linked_list.insert_nth(2				,  3			)
  assert str(__UpperCamelCase			) == "->".join(str(__UpperCamelCase			) for i in range(1				,  6			)			)

  assert circular_linked_list.is_empty() is False


if __name__ == "__main__":
   import doctest

   doctest.testmod()
