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https://github.com/python/cpython
synced 2024-09-06 02:18:37 +00:00
GH-115060: Speed up pathlib.Path.glob()
by removing redundant regex matching (#115061)
When expanding and filtering paths for a `**` wildcard segment, build an `re.Pattern` object from the subsequent pattern parts, rather than the entire pattern, and match against the `os.DirEntry` object prior to instantiating a path object. Also skip compiling a pattern when expanding a `*` wildcard segment.
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9d1a353230
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@ -587,9 +587,13 @@ def iterdir(self):
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def _scandir(self):
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return os.scandir(self)
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def _make_child_entry(self, entry):
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def _direntry_str(self, entry):
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# Transform an entry yielded from _scandir() into a path string.
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return entry.name if str(self) == '.' else entry.path
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def _make_child_direntry(self, entry):
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# Transform an entry yielded from _scandir() into a path object.
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path_str = entry.name if str(self) == '.' else entry.path
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path_str = self._direntry_str(entry)
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path = self.with_segments(path_str)
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path._str = path_str
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path._drv = self.drive
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@ -86,18 +86,28 @@ def _select_children(parent_paths, dir_only, follow_symlinks, match):
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continue
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except OSError:
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continue
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if match(entry.name):
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yield parent_path._make_child_entry(entry)
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# Avoid cost of making a path object for non-matching paths by
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# matching against the os.DirEntry.name string.
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if match is None or match(entry.name):
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yield parent_path._make_child_direntry(entry)
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def _select_recursive(parent_paths, dir_only, follow_symlinks):
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"""Yield given paths and all their subdirectories, recursively."""
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def _select_recursive(parent_paths, dir_only, follow_symlinks, match):
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"""Yield given paths and all their children, recursively, filtering by
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string and type.
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"""
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if follow_symlinks is None:
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follow_symlinks = False
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for parent_path in parent_paths:
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if match is not None:
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# If we're filtering paths through a regex, record the length of
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# the parent path. We'll pass it to match(path, pos=...) later.
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parent_len = len(str(parent_path._make_child_relpath('_'))) - 1
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paths = [parent_path._make_child_relpath('')]
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while paths:
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path = paths.pop()
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if match is None or match(str(path), parent_len):
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# Yield *directory* path that matches pattern (if any).
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yield path
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try:
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# We must close the scandir() object before proceeding to
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@ -108,14 +118,22 @@ def _select_recursive(parent_paths, dir_only, follow_symlinks):
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pass
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else:
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for entry in entries:
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# Handle directory entry.
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try:
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if entry.is_dir(follow_symlinks=follow_symlinks):
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paths.append(path._make_child_entry(entry))
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# Recurse into this directory.
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paths.append(path._make_child_direntry(entry))
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continue
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except OSError:
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pass
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# Handle file entry.
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if not dir_only:
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yield path._make_child_entry(entry)
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# Avoid cost of making a path object for non-matching
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# files by matching against the os.DirEntry object.
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if match is None or match(path._direntry_str(entry), parent_len):
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# Yield *file* path that matches pattern (if any).
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yield path._make_child_direntry(entry)
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def _select_unique(paths):
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@ -750,8 +768,14 @@ def _scandir(self):
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from contextlib import nullcontext
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return nullcontext(self.iterdir())
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def _make_child_entry(self, entry):
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def _direntry_str(self, entry):
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# Transform an entry yielded from _scandir() into a path string.
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# PathBase._scandir() yields PathBase objects, so use str().
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return str(entry)
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def _make_child_direntry(self, entry):
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# Transform an entry yielded from _scandir() into a path object.
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# PathBase._scandir() yields PathBase objects, so this is a no-op.
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return entry
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def _make_child_relpath(self, name):
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@ -769,43 +793,49 @@ def glob(self, pattern, *, case_sensitive=None, follow_symlinks=None):
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stack = pattern._pattern_stack
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specials = ('', '.', '..')
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filter_paths = False
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deduplicate_paths = False
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sep = self.pathmod.sep
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paths = iter([self] if self.is_dir() else [])
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while stack:
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part = stack.pop()
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if part in specials:
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# Join special component (e.g. '..') onto paths.
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paths = _select_special(paths, part)
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elif part == '**':
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# Consume adjacent '**' components.
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# Consume following '**' components, which have no effect.
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while stack and stack[-1] == '**':
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stack.pop()
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# Consume adjacent non-special components and enable post-walk
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# regex filtering, provided we're treating symlinks consistently.
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# Consume following non-special components, provided we're
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# treating symlinks consistently. Each component is joined
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# onto 'part', which is used to generate an re.Pattern object.
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if follow_symlinks is not None:
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while stack and stack[-1] not in specials:
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filter_paths = True
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stack.pop()
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part += sep + stack.pop()
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# If the previous loop consumed pattern components, compile an
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# re.Pattern object based on those components.
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match = _compile_pattern(part, sep, case_sensitive) if part != '**' else None
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# Recursively walk directories, filtering by type and regex.
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paths = _select_recursive(paths, bool(stack), follow_symlinks, match)
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dir_only = bool(stack)
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paths = _select_recursive(paths, dir_only, follow_symlinks)
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if deduplicate_paths:
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# De-duplicate if we've already seen a '**' component.
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if deduplicate_paths:
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paths = _select_unique(paths)
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deduplicate_paths = True
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elif '**' in part:
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raise ValueError("Invalid pattern: '**' can only be an entire path component")
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else:
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dir_only = bool(stack)
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match = _compile_pattern(part, sep, case_sensitive)
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paths = _select_children(paths, dir_only, follow_symlinks, match)
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if filter_paths:
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# Filter out paths that don't match pattern.
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prefix_len = len(str(self._make_child_relpath('_'))) - 1
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match = _compile_pattern(pattern._pattern_str, sep, case_sensitive)
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paths = (path for path in paths if match(path._pattern_str, prefix_len))
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# If the pattern component isn't '*', compile an re.Pattern
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# object based on the component.
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match = _compile_pattern(part, sep, case_sensitive) if part != '*' else None
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# Iterate over directories' children filtering by type and regex.
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paths = _select_children(paths, bool(stack), follow_symlinks, match)
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return paths
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def rglob(self, pattern, *, case_sensitive=None, follow_symlinks=None):
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@ -854,7 +884,7 @@ def walk(self, top_down=True, on_error=None, follow_symlinks=False):
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if is_dir:
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if not top_down:
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paths.append(path._make_child_entry(entry))
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paths.append(path._make_child_direntry(entry))
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dirnames.append(entry.name)
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else:
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filenames.append(entry.name)
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@ -1250,6 +1250,19 @@ def test_glob_pathlike(self):
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self.assertEqual(expect, set(p.glob(P(pattern))))
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self.assertEqual(expect, set(p.glob(FakePath(pattern))))
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@needs_symlinks
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def test_glob_dot(self):
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P = self.cls
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with os_helper.change_cwd(P(self.base, "dirC")):
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self.assertEqual(
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set(P('.').glob('*')), {P("fileC"), P("novel.txt"), P("dirD")})
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self.assertEqual(
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set(P('.').glob('**')), {P("fileC"), P("novel.txt"), P("dirD"), P("dirD/fileD"), P(".")})
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self.assertEqual(
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set(P('.').glob('**/*')), {P("fileC"), P("novel.txt"), P("dirD"), P("dirD/fileD")})
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self.assertEqual(
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set(P('.').glob('**/*/*')), {P("dirD/fileD")})
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def test_rglob_pathlike(self):
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P = self.cls
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p = P(self.base, "dirC")
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@ -0,0 +1 @@
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Speed up :meth:`pathlib.Path.glob` by removing redundant regex matching.
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