
'''simple docstring'''
import logging
import os
import threading
import time


try:
						import warnings
except ImportError:
						lowerCAmelCase					:    str           = None

try:
						import msvcrt
except ImportError:
						lowerCAmelCase					:    Optional[Any]           = None

try:
						import fcntl
except ImportError:
						lowerCAmelCase					:    Any           = None


# Backward compatibility
# ------------------------------------------------
try:
						TimeoutError
except NameError:
						lowerCAmelCase					:    Optional[Any]           = OSError


# Data
# ------------------------------------------------
lowerCAmelCase					:    List[str]           = [
    'Timeout',
    'BaseFileLock',
    'WindowsFileLock',
    'UnixFileLock',
    'SoftFileLock',
    'FileLock',
]

lowerCAmelCase					:    Dict           = '3.0.12'


lowerCAmelCase					:    Optional[int]           = None







def 		A_(     ):
							global _logger
							UpperCamelCase   			=     _logger or logging.getLogger(__name__)
							return _logger


class 			SCREAMING_SNAKE_CASE__      (     snake_case_):







				def __init__(       self						,				A_     )->		str:







											'''simple docstring'''






											UpperCamelCase   			=     lock_file
											return None







				def __str__(       self     )->		Tuple:







											'''simple docstring'''






											UpperCamelCase   			=     F'''The file lock \'{self.lock_file}\' could not be acquired.'''
											return temp


class 			SCREAMING_SNAKE_CASE__      :







				def __init__(       self						,				A_     )->		Any:







											'''simple docstring'''






											UpperCamelCase   			=     lock
											return None







				def __enter__(       self     )->		Any:







											'''simple docstring'''






											return self.lock







				def __exit__(       self						,				A_						,				A_						,				A_     )->		Any:







											'''simple docstring'''






											self.lock.release()
											return None


class 			SCREAMING_SNAKE_CASE__      :







				def __init__(       self						,				A_						,				A_=-1						,				A_=None     )->		List[Any]:







											'''simple docstring'''






											UpperCamelCase   			=     max_filename_length if max_filename_length is not None else 255
											# Hash the filename if it's too long
											UpperCamelCase   			=     self.hash_filename_if_too_long(A_						,				A_     )
											# The path to the lock file.
											UpperCamelCase   			=     lock_file

											# The file descriptor for the *_lock_file* as it is returned by the
											# os.open() function.
											# This file lock is only NOT None, if the object currently holds the
											# lock.
											UpperCamelCase   			=     None

											# The default timeout value.
											UpperCamelCase   			=     timeout

											# We use this lock primarily for the lock counter.
											UpperCamelCase   			=     threading.Lock()

											# The lock counter is used for implementing the nested locking
											# mechanism. Whenever the lock is acquired, the counter is increased and
											# the lock is only released, when this value is 0 again.
											UpperCamelCase   			=     0
											return None







				@property
				def 						UpperCAmelCase_    (       self     )->		List[Any]:







											'''simple docstring'''






											return self._lock_file







				@property
				def 						UpperCAmelCase_    (       self     )->		Optional[Any]:







											'''simple docstring'''






											return self._timeout







				@timeout.setter
				def 						UpperCAmelCase_    (       self						,				A_     )->		Optional[Any]:







											'''simple docstring'''






											UpperCamelCase   			=     float(A_     )
											return None







				def 						UpperCAmelCase_    (       self     )->		List[Any]:







											'''simple docstring'''






											raise NotImplementedError()







				def 						UpperCAmelCase_    (       self     )->		int:







											'''simple docstring'''






											raise NotImplementedError()







				@property
				def 						UpperCAmelCase_    (       self     )->		List[Any]:







											'''simple docstring'''






											return self._lock_file_fd is not None







				def 						UpperCAmelCase_    (       self						,				A_=None						,				A_=0.05     )->		int:







											'''simple docstring'''






											if timeout is None:
																		UpperCamelCase   			=     self.timeout

											# Increment the number right at the beginning.
											# We can still undo it, if something fails.
											with self._thread_lock:
																		self._lock_counter += 1

											UpperCamelCase   			=     id(self     )
											UpperCamelCase   			=     self._lock_file
											UpperCamelCase   			=     time.time()
											try:
																		while True:
																									with self._thread_lock:
																																if not self.is_locked:
																																							logger().debug(F'''Attempting to acquire lock {lock_id} on {lock_filename}'''     )
																																							self._acquire()

																									if self.is_locked:
																																logger().debug(F'''Lock {lock_id} acquired on {lock_filename}'''     )
																																break
																									elif timeout >= 0 and time.time() - start_time > timeout:
																																logger().debug(F'''Timeout on acquiring lock {lock_id} on {lock_filename}'''     )
																																raise Timeout(self._lock_file     )
																									else:
																																logger().debug(
																																    F'''Lock {lock_id} not acquired on {lock_filename}, waiting {poll_intervall} seconds ...'''     )
																																time.sleep(A_     )
											except:  # noqa
																		# Something did go wrong, so decrement the counter.
																		with self._thread_lock:
																									UpperCamelCase   			=     max(0						,				self._lock_counter - 1     )

																		raise
											return _Acquire_ReturnProxy(lock=self     )







				def 						UpperCAmelCase_    (       self						,				A_=False     )->		str:







											'''simple docstring'''






											with self._thread_lock:
																		if self.is_locked:
																									self._lock_counter -= 1

																									if self._lock_counter == 0 or force:
																																UpperCamelCase   			=     id(self     )
																																UpperCamelCase   			=     self._lock_file

																																logger().debug(F'''Attempting to release lock {lock_id} on {lock_filename}'''     )
																																self._release()
																																UpperCamelCase   			=     0
																																logger().debug(F'''Lock {lock_id} released on {lock_filename}'''     )

											return None







				def __enter__(       self     )->		List[str]:







											'''simple docstring'''






											self.acquire()
											return self







				def __exit__(       self						,				A_						,				A_						,				A_     )->		Union[str, Any]:







											'''simple docstring'''






											self.release()
											return None







				def __del__(       self     )->		List[Any]:







											'''simple docstring'''






											self.release(force=A_     )
											return None







				def 						UpperCAmelCase_    (       self						,				A_						,				A_     )->		str:







											'''simple docstring'''






											UpperCamelCase   			=     os.path.basename(A_     )
											if len(A_     ) > max_length and max_length > 0:
																		UpperCamelCase   			=     os.path.dirname(A_     )
																		UpperCamelCase   			=     str(hash(A_     )     )
																		UpperCamelCase   			=     filename[: max_length - len(A_     ) - 8] + '...' + hashed_filename + '.lock'
																		return os.path.join(A_						,				A_     )
											else:
																		return path


class 			SCREAMING_SNAKE_CASE__      (     snake_case_):







				def __init__(       self						,				A_						,				A_=-1						,				A_=None     )->		Tuple:







											'''simple docstring'''






											from .file_utils import relative_to_absolute_path

											super().__init__(A_						,				timeout=A_						,				max_filename_length=A_     )
											UpperCamelCase   			=     '\\\\?\\' + relative_to_absolute_path(self.lock_file     )







				def 						UpperCAmelCase_    (       self     )->		List[str]:







											'''simple docstring'''






											UpperCamelCase   			=     os.O_RDWR | os.O_CREAT | os.O_TRUNC

											try:
																		UpperCamelCase   			=     os.open(self._lock_file						,				A_     )
											except OSError:
																		pass
											else:
																		try:
																									msvcrt.locking(A_						,				msvcrt.LK_NBLCK						,				1     )
																		except OSError:
																									os.close(A_     )
																		else:
																									UpperCamelCase   			=     fd
											return None







				def 						UpperCAmelCase_    (       self     )->		Dict:







											'''simple docstring'''






											UpperCamelCase   			=     self._lock_file_fd
											UpperCamelCase   			=     None
											msvcrt.locking(A_						,				msvcrt.LK_UNLCK						,				1     )
											os.close(A_     )

											try:
																		os.remove(self._lock_file     )
											# Probably another instance of the application
											# that acquired the file lock.
											except OSError:
																		pass
											return None


class 			SCREAMING_SNAKE_CASE__      (     snake_case_):







				def __init__(       self						,				A_						,				A_=-1						,				A_=None     )->		Optional[int]:







											'''simple docstring'''






											UpperCamelCase   			=     os.statvfs(os.path.dirname(A_     )     ).f_namemax
											super().__init__(A_						,				timeout=A_						,				max_filename_length=A_     )







				def 						UpperCAmelCase_    (       self     )->		Tuple:







											'''simple docstring'''






											UpperCamelCase   			=     os.O_RDWR | os.O_CREAT | os.O_TRUNC
											UpperCamelCase   			=     os.open(self._lock_file						,				A_     )

											try:
																		fcntl.flock(A_						,				fcntl.LOCK_EX | fcntl.LOCK_NB     )
											except OSError:
																		os.close(A_     )
											else:
																		UpperCamelCase   			=     fd
											return None







				def 						UpperCAmelCase_    (       self     )->		List[Any]:







											'''simple docstring'''






											UpperCamelCase   			=     self._lock_file_fd
											UpperCamelCase   			=     None
											fcntl.flock(A_						,				fcntl.LOCK_UN     )
											os.close(A_     )
											return None


class 			SCREAMING_SNAKE_CASE__      (     snake_case_):







				def 						UpperCAmelCase_    (       self     )->		Tuple:







											'''simple docstring'''






											UpperCamelCase   			=     os.O_WRONLY | os.O_CREAT | os.O_EXCL | os.O_TRUNC
											try:
																		UpperCamelCase   			=     os.open(self._lock_file						,				A_     )
											except OSError:
																		pass
											else:
																		UpperCamelCase   			=     fd
											return None







				def 						UpperCAmelCase_    (       self     )->		str:







											'''simple docstring'''






											os.close(self._lock_file_fd     )
											UpperCamelCase   			=     None

											try:
																		os.remove(self._lock_file     )
											# The file is already deleted and that's what we want.
											except OSError:
																		pass
											return None


lowerCAmelCase					:    List[str]           = None

if msvcrt:
						lowerCAmelCase					:    Union[str, Any]           = WindowsFileLock
elif fcntl:
						lowerCAmelCase					:    Any           = UnixFileLock
else:
						lowerCAmelCase					:    Dict           = SoftFileLock

						if warnings is not None:
												warnings.warn('only soft file lock is available')






'''simple docstring'''
lowerCAmelCase					:    Optional[Any]           = {
    'A': ['B', 'C', 'E'],
    'B': ['A', 'D', 'E'],
    'C': ['A', 'F', 'G'],
    'D': ['B'],
    'E': ['A', 'B', 'D'],
    'F': ['C'],
    'G': ['C'],
}







def 		A_(     A						:		dict		,     A						:		str		,     A						:		Optional[Any]):
							UpperCamelCase   			=     set()
							# keep track of all the paths to be checked
							UpperCamelCase   			=     [[start]]

							# return path if start is goal
							if start == goal:
														return [start]

							# keeps looping until all possible paths have been checked
							while queue:
														# pop the first path from the queue
														UpperCamelCase   			=     queue.pop(0)
														# get the last node from the path
														UpperCamelCase   			=     path[-1]
														if node not in explored:
																					UpperCamelCase   			=     graph[node]
																					# go through all neighbour nodes, construct a new path and
																					# push it into the queue
																					for neighbour in neighbours:
																												UpperCamelCase   			=     list(A)
																												new_path.append(A)
																												queue.append(A)
																												# return path if neighbour is goal
																												if neighbour == goal:
																																			return new_path

            # mark node as explored
																					explored.add(A)

    # in case there's no path between the 2 nodes
							return []







def 		A_(     A						:		dict		,     A						:		str		,     A						:		Tuple):
							if not graph or start not in graph or target not in graph:
														return -1
							if start == target:
														return 0
							UpperCamelCase   			=     [start]
							UpperCamelCase   			=     set(A)
							# Keep tab on distances from `start` node.
							UpperCamelCase   			=     {start: 0, target: -1}
							while queue:
														UpperCamelCase   			=     queue.pop(0)
														if node == target:
																					UpperCamelCase   			=     (
																					    dist[node] if dist[target] == -1 else min(dist[target]		,     dist[node])
																					)
														for adjacent in graph[node]:
																					if adjacent not in visited:
																												visited.add(A)
																												queue.append(A)
																												UpperCamelCase   			=     dist[node] + 1
							return dist[target]


if __name__ == "__main__":
						print(bfs_shortest_path(demo_graph, 'G', 'D'))  # returns ['G', 'C', 'A', 'B', 'D']
						print(bfs_shortest_path_distance(demo_graph, 'G', 'D'))  # returns 4




