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GH-102613: Improve performance of pathlib.Path.rglob() #104244

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Merged
barneygale merged 4 commits into from
May 7, 2023
Merged

GH-102613: Improve performance of pathlib.Path.rglob() #104244

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e3d0923
GH-102613: Improve performance of `pathlib.Path.rglob()`
barneygale May 6, 2023
f235d66
Add some tests for de-duplicating recursive globs.
barneygale May 6, 2023
79337a1
Simplify test condition
barneygale May 6, 2023
7bee0cf
Slice pattern_parts only once.
barneygale May 7, 2023
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Slice pattern_parts only once.
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@barneygale
barneygale committed May 7, 2023
commit 7bee0cf8aa209685af4fb813401342f9e6621feb
19 changes: 11 additions & 8 deletions Lib/pathlib.py
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Original file line number Diff line number Diff line change
Expand Up @@ -64,22 +64,25 @@ def _is_case_sensitive(flavour):
@functools.lru_cache()
def _make_selector(pattern_parts, flavour, case_sensitive):
pat = pattern_parts[0]
child_parts = pattern_parts[1:]
if not pat:
return _TerminatingSelector()
if pat == '**':
while child_parts and child_parts[0] == '**':
child_parts = child_parts[1:]
child_parts_idx = 1
while child_parts_idx < len(pattern_parts) and pattern_parts[child_parts_idx] == '**':
child_parts_idx += 1
child_parts = pattern_parts[child_parts_idx:]
if '**' in child_parts:
cls = _DoubleRecursiveWildcardSelector
else:
cls = _RecursiveWildcardSelector
elif pat == '..':
cls = _ParentSelector
elif '**' in pat:
raise ValueError("Invalid pattern: '**' can only be an entire path component")
else:
cls = _WildcardSelector
child_parts = pattern_parts[1:]
if pat == '..':
cls = _ParentSelector
elif '**' in pat:
raise ValueError("Invalid pattern: '**' can only be an entire path component")
else:
cls = _WildcardSelector
return cls(pat, child_parts, flavour, case_sensitive)


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