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gh-101000: Add os.path.splitroot() (#101002)

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Co-authored-by: Eryk Sun <eryksun@gmail.com>
Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
This commit is contained in:
Barney Gale 2023-01-27 00:28:27 +00:00 • committed by GitHub
parent 37f15a5efa
commit e5b08ddddf
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9 changed files with 279 additions and 165 deletions
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24
Lib/pathlib.py
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@ -271,19 +271,6 @@ class PurePath(object):
# when pickling related paths.
return (self.__class__, tuple(self._parts))
@classmethod
def _split_root(cls, part):
sep = cls._flavour.sep
rel = cls._flavour.splitdrive(part)[1].lstrip(sep)
anchor = part.removesuffix(rel)
if anchor:
anchor = cls._flavour.normpath(anchor)
drv, root = cls._flavour.splitdrive(anchor)
if drv.startswith(sep):
# UNC paths always have a root.
root = sep
return drv, root, rel
@classmethod
def _parse_parts(cls, parts):
if not parts:
@ -293,7 +280,10 @@ class PurePath(object):
path = cls._flavour.join(*parts)
if altsep:
path = path.replace(altsep, sep)
drv, root, rel = cls._split_root(path)
drv, root, rel = cls._flavour.splitroot(path)
if drv.startswith(sep):
# pathlib assumes that UNC paths always have a root.
root = sep
unfiltered_parsed = [drv + root] + rel.split(sep)
parsed = [sys.intern(x) for x in unfiltered_parsed if x and x != '.']
return drv, root, parsed
@ -493,9 +483,9 @@ class PurePath(object):
"""Return a new path with the file name changed."""
if not self.name:
raise ValueError("%r has an empty name" % (self,))
drv, root, parts = self._parse_parts((name,))
if (not name or name[-1] in [self._flavour.sep, self._flavour.altsep]
or drv or root or len(parts) != 1):
f = self._flavour
drv, root, tail = f.splitroot(name)
if drv or root or not tail or f.sep in tail or (f.altsep and f.altsep in tail):
raise ValueError("Invalid name %r" % (name))
return self._from_parsed_parts(self._drv, self._root,
self._parts[:-1] + [name])