mirror of https://github.com/python/cpython
GH-104102: Optimize `pathlib.Path.glob()` handling of `../` pattern segments (GH-104103)
These segments do not require a `stat()` call, as the selector's `_select_from()` method is called after we've established that the parent is a directory.
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@ -74,6 +74,8 @@ def _make_selector(pattern_parts, flavour):
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return _TerminatingSelector()
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if pat == '**':
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cls = _RecursiveWildcardSelector
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elif pat == '..':
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cls = _ParentSelector
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elif '**' in pat:
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raise ValueError("Invalid pattern: '**' can only be an entire path component")
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elif _is_wildcard_pattern(pat):
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@ -114,6 +116,16 @@ class _TerminatingSelector:
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yield parent_path
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class _ParentSelector(_Selector):
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def __init__(self, name, child_parts, flavour):
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_Selector.__init__(self, child_parts, flavour)
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def _select_from(self, parent_path, is_dir, exists, scandir):
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path = parent_path._make_child_relpath('..')
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for p in self.successor._select_from(path, is_dir, exists, scandir):
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yield p
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class _PreciseSelector(_Selector):
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def __init__(self, name, child_parts, flavour):
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@ -1892,8 +1892,13 @@ class _BasePathTest(object):
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P = self.cls
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p = P(BASE)
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self.assertEqual(set(p.glob("..")), { P(BASE, "..") })
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self.assertEqual(set(p.glob("../..")), { P(BASE, "..", "..") })
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self.assertEqual(set(p.glob("dirA/..")), { P(BASE, "dirA", "..") })
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self.assertEqual(set(p.glob("dirA/../file*")), { P(BASE, "dirA/../fileA") })
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self.assertEqual(set(p.glob("dirA/../file*/..")), set())
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self.assertEqual(set(p.glob("../xyzzy")), set())
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self.assertEqual(set(p.glob("xyzzy/..")), set())
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self.assertEqual(set(p.glob("/".join([".."] * 50))), { P(BASE, *[".."] * 50)})
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@os_helper.skip_unless_symlink
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def test_glob_permissions(self):
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@ -0,0 +1,2 @@
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Improve performance of :meth:`pathlib.Path.glob` when evaluating patterns
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that contain ``'../'`` segments.
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