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from __future__ import annotations
import typing
from collections import deque
from collections.abc import Collection, Iterator
from ._path import combine
if typing.TYPE_CHECKING:
from typing import Callable
from ._base import FS
from ._info import Info
class BoundWalker:
def __init__(self, fs: FS):
self._fs = fs
def _iter_walk(
self, path: str, namespaces: Collection[str] | None = None
) -> Iterator[tuple[str, Info | None]]:
"""Walk files using a *breadth first* search."""
queue = deque([path])
push = queue.appendleft
pop = queue.pop
_scan = self._fs.scandir
_combine = combine
while queue:
dir_path = pop()
for info in _scan(dir_path, namespaces=namespaces):
if info.is_dir:
yield dir_path, info
push(_combine(dir_path, info.name))
else:
yield dir_path, info
yield path, None
def _filter(
self,
include: Callable[[str, Info], bool] = lambda path, info: True,
path: str = "/",
namespaces: Collection[str] | None = None,
) -> Iterator[str]:
_combine = combine
for path, info in self._iter_walk(path, namespaces):
if info is not None and include(path, info):
yield _combine(path, info.name)
def files(self, path: str = "/") -> Iterator[str]:
yield from self._filter(lambda _, info: info.is_file, path)
def dirs(self, path: str = "/") -> Iterator[str]:
yield from self._filter(lambda _, info: info.is_dir, path)
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