Issue #15275: Clean up and speed up the ntpath module.
This commit is contained in:
Serhiy Storchaka
parent
f886697659
commit
8518b79a8d
170
Lib/ntpath.py
170
Lib/ntpath.py
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@ -32,48 +32,12 @@ if 'ce' in sys.builtin_module_names:
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defpath = '\\Windows'
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devnull = 'nul'
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def _get_empty(path):
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if isinstance(path, bytes):
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return b''
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else:
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return ''
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def _get_sep(path):
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if isinstance(path, bytes):
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return b'\\'
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else:
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return '\\'
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def _get_altsep(path):
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if isinstance(path, bytes):
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return b'/'
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else:
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return '/'
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def _get_bothseps(path):
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if isinstance(path, bytes):
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return b'\\/'
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else:
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return '\\/'
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def _get_dot(path):
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if isinstance(path, bytes):
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return b'.'
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else:
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return '.'
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def _get_colon(path):
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if isinstance(path, bytes):
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return b':'
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else:
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return ':'
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def _get_special(path):
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if isinstance(path, bytes):
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return (b'\\\\.\\', b'\\\\?\\')
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else:
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return ('\\\\.\\', '\\\\?\\')
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# Normalize the case of a pathname and map slashes to backslashes.
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# Other normalizations (such as optimizing '../' away) are not done
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# (this is done by normpath).
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@ -82,10 +46,16 @@ def normcase(s):
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"""Normalize case of pathname.
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Makes all characters lowercase and all slashes into backslashes."""
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if not isinstance(s, (bytes, str)):
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raise TypeError("normcase() argument must be str or bytes, "
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"not '{}'".format(s.__class__.__name__))
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return s.replace(_get_altsep(s), _get_sep(s)).lower()
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try:
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if isinstance(s, bytes):
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return s.replace(b'/', b'\\').lower()
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else:
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return s.replace('/', '\\').lower()
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except (TypeError, AttributeError):
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if not isinstance(s, (bytes, str)):
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raise TypeError("normcase() argument must be str or bytes, "
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"not %r" % s.__class__.__name__) from None
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raise
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# Return whether a path is absolute.
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@ -97,14 +67,19 @@ def normcase(s):
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def isabs(s):
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"""Test whether a path is absolute"""
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s = splitdrive(s)[1]
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return len(s) > 0 and s[:1] in _get_bothseps(s)
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return len(s) > 0 and s[0] in _get_bothseps(s)
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# Join two (or more) paths.
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def join(path, *paths):
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sep = _get_sep(path)
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seps = _get_bothseps(path)
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colon = _get_colon(path)
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if isinstance(path, bytes):
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sep = b'\\'
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seps = b'\\/'
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colon = b':'
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else:
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sep = '\\'
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seps = '\\/'
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colon = ':'
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result_drive, result_path = splitdrive(path)
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for p in paths:
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p_drive, p_path = splitdrive(p)
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@ -155,10 +130,16 @@ def splitdrive(p):
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Paths cannot contain both a drive letter and a UNC path.
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"""
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empty = _get_empty(p)
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if len(p) > 1:
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sep = _get_sep(p)
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normp = p.replace(_get_altsep(p), sep)
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if len(p) >= 2:
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if isinstance(p, bytes):
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sep = b'\\'
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altsep = b'/'
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colon = b':'
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else:
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sep = '\\'
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altsep = '/'
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colon = ':'
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normp = p.replace(altsep, sep)
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if (normp[0:2] == sep*2) and (normp[2:3] != sep):
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# is a UNC path:
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# vvvvvvvvvvvvvvvvvvvv drive letter or UNC path
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@ -166,18 +147,18 @@ def splitdrive(p):
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# directory ^^^^^^^^^^^^^^^
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index = normp.find(sep, 2)
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if index == -1:
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return empty, p
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return p[:0], p
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index2 = normp.find(sep, index + 1)
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# a UNC path can't have two slashes in a row
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# (after the initial two)
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if index2 == index + 1:
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return empty, p
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return p[:0], p
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if index2 == -1:
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index2 = len(p)
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return p[:index2], p[index2:]
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if normp[1:2] == _get_colon(p):
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if normp[1:2] == colon:
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return p[:2], p[2:]
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return empty, p
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return p[:0], p
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# Parse UNC paths
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@ -221,10 +202,7 @@ def split(p):
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i -= 1
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head, tail = p[:i], p[i:] # now tail has no slashes
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# remove trailing slashes from head, unless it's all slashes
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head2 = head
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while head2 and head2[-1:] in seps:
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head2 = head2[:-1]
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head = head2 or head
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head = head.rstrip(seps) or head
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return d + head, tail
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@ -234,8 +212,10 @@ def split(p):
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# It is always true that root + ext == p.
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def splitext(p):
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return genericpath._splitext(p, _get_sep(p), _get_altsep(p),
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_get_dot(p))
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if isinstance(p, bytes):
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return genericpath._splitext(p, b'\\', b'/', b'.')
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else:
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return genericpath._splitext(p, '\\', '/', '.')
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splitext.__doc__ = genericpath._splitext.__doc__
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@ -343,7 +323,7 @@ def expanduser(path):
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userhome = join(drive, os.environ['HOMEPATH'])
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if isinstance(path, bytes):
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userhome = userhome.encode(sys.getfilesystemencoding())
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userhome = os.fsencode(userhome)
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if i != 1: #~user
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userhome = join(dirname(userhome), path[1:i])
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@ -369,13 +349,14 @@ def expandvars(path):
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Unknown variables are left unchanged."""
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if isinstance(path, bytes):
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if ord('$') not in path and ord('%') not in path:
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if b'$' not in path and b'%' not in path:
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return path
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import string
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varchars = bytes(string.ascii_letters + string.digits + '_-', 'ascii')
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quote = b'\''
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percent = b'%'
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brace = b'{'
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rbrace = b'}'
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dollar = b'$'
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environ = getattr(os, 'environb', None)
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else:
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@ -386,6 +367,7 @@ def expandvars(path):
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quote = '\''
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percent = '%'
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brace = '{'
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rbrace = '}'
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dollar = '$'
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environ = os.environ
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res = path[:0]
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@ -432,15 +414,9 @@ def expandvars(path):
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path = path[index+2:]
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pathlen = len(path)
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try:
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if isinstance(path, bytes):
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index = path.index(b'}')
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else:
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index = path.index('}')
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index = path.index(rbrace)
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except ValueError:
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if isinstance(path, bytes):
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res += b'${' + path
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else:
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res += '${' + path
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res += dollar + brace + path
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index = pathlen - 1
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else:
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var = path[:index]
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@ -450,10 +426,7 @@ def expandvars(path):
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else:
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value = environ[var]
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except KeyError:
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if isinstance(path, bytes):
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value = b'${' + var + b'}'
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else:
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value = '${' + var + '}'
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value = dollar + brace + var + rbrace
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res += value
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else:
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var = path[:0]
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@ -485,16 +458,25 @@ def expandvars(path):
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def normpath(path):
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"""Normalize path, eliminating double slashes, etc."""
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sep = _get_sep(path)
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dotdot = _get_dot(path) * 2
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special_prefixes = _get_special(path)
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if isinstance(path, bytes):
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sep = b'\\'
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altsep = b'/'
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curdir = b'.'
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pardir = b'..'
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special_prefixes = (b'\\\\.\\', b'\\\\?\\')
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else:
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sep = '\\'
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altsep = '/'
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curdir = '.'
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pardir = '..'
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special_prefixes = ('\\\\.\\', '\\\\?\\')
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if path.startswith(special_prefixes):
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# in the case of paths with these prefixes:
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# \\.\ -> device names
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# \\?\ -> literal paths
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# do not do any normalization, but return the path unchanged
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return path
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path = path.replace(_get_altsep(path), sep)
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path = path.replace(altsep, sep)
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prefix, path = splitdrive(path)
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# collapse initial backslashes
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@ -505,13 +487,13 @@ def normpath(path):
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comps = path.split(sep)
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i = 0
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while i < len(comps):
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if not comps[i] or comps[i] == _get_dot(path):
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if not comps[i] or comps[i] == curdir:
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del comps[i]
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elif comps[i] == dotdot:
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if i > 0 and comps[i-1] != dotdot:
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elif comps[i] == pardir:
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if i > 0 and comps[i-1] != pardir:
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del comps[i-1:i+1]
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i -= 1
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elif i == 0 and prefix.endswith(_get_sep(path)):
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elif i == 0 and prefix.endswith(sep):
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del comps[i]
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else:
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i += 1
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@ -519,7 +501,7 @@ def normpath(path):
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i += 1
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# If the path is now empty, substitute '.'
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if not prefix and not comps:
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comps.append(_get_dot(path))
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comps.append(curdir)
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return prefix + sep.join(comps)
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@ -559,12 +541,19 @@ realpath = abspath
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supports_unicode_filenames = (hasattr(sys, "getwindowsversion") and
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sys.getwindowsversion()[3] >= 2)
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def relpath(path, start=curdir):
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def relpath(path, start=None):
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"""Return a relative version of a path"""
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sep = _get_sep(path)
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if isinstance(path, bytes):
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sep = b'\\'
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curdir = b'.'
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pardir = b'..'
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else:
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sep = '\\'
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curdir = '.'
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pardir = '..'
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if start is curdir:
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start = _get_dot(path)
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if start is None:
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start = curdir
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if not path:
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raise ValueError("no path specified")
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@ -574,9 +563,8 @@ def relpath(path, start=curdir):
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start_drive, start_rest = splitdrive(start_abs)
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path_drive, path_rest = splitdrive(path_abs)
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if normcase(start_drive) != normcase(path_drive):
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error = "path is on mount '{0}', start on mount '{1}'".format(
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path_drive, start_drive)
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raise ValueError(error)
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raise ValueError("path is on mount %r, start on mount %r" % (
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path_drive, start_drive))
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start_list = [x for x in start_rest.split(sep) if x]
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path_list = [x for x in path_rest.split(sep) if x]
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@ -587,13 +575,9 @@ def relpath(path, start=curdir):
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break
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i += 1
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if isinstance(path, bytes):
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pardir = b'..'
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else:
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pardir = '..'
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rel_list = [pardir] * (len(start_list)-i) + path_list[i:]
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if not rel_list:
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return _get_dot(path)
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return curdir
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return join(*rel_list)
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