mirror of
https://github.com/python/cpython.git
synced 2024-11-25 19:03:49 +08:00
107 lines
3.0 KiB
Python
107 lines
3.0 KiB
Python
"""
|
|
Path operations common to more than one OS
|
|
Do not use directly. The OS specific modules import the appropriate
|
|
functions from this module themselves.
|
|
"""
|
|
import os
|
|
import stat
|
|
|
|
__all__ = ['commonprefix', 'exists', 'getatime', 'getctime', 'getmtime',
|
|
'getsize', 'isdir', 'isfile']
|
|
|
|
|
|
# Does a path exist?
|
|
# This is false for dangling symbolic links on systems that support them.
|
|
def exists(path):
|
|
"""Test whether a path exists. Returns False for broken symbolic links"""
|
|
try:
|
|
st = os.stat(path)
|
|
except os.error:
|
|
return False
|
|
return True
|
|
|
|
|
|
# This follows symbolic links, so both islink() and isdir() can be true
|
|
# for the same path ono systems that support symlinks
|
|
def isfile(path):
|
|
"""Test whether a path is a regular file"""
|
|
try:
|
|
st = os.stat(path)
|
|
except os.error:
|
|
return False
|
|
return stat.S_ISREG(st.st_mode)
|
|
|
|
|
|
# Is a path a directory?
|
|
# This follows symbolic links, so both islink() and isdir()
|
|
# can be true for the same path on systems that support symlinks
|
|
def isdir(s):
|
|
"""Return true if the pathname refers to an existing directory."""
|
|
try:
|
|
st = os.stat(s)
|
|
except os.error:
|
|
return False
|
|
return stat.S_ISDIR(st.st_mode)
|
|
|
|
|
|
def getsize(filename):
|
|
"""Return the size of a file, reported by os.stat()."""
|
|
return os.stat(filename).st_size
|
|
|
|
|
|
def getmtime(filename):
|
|
"""Return the last modification time of a file, reported by os.stat()."""
|
|
return os.stat(filename).st_mtime
|
|
|
|
|
|
def getatime(filename):
|
|
"""Return the last access time of a file, reported by os.stat()."""
|
|
return os.stat(filename).st_atime
|
|
|
|
|
|
def getctime(filename):
|
|
"""Return the metadata change time of a file, reported by os.stat()."""
|
|
return os.stat(filename).st_ctime
|
|
|
|
|
|
# Return the longest prefix of all list elements.
|
|
def commonprefix(m):
|
|
"Given a list of pathnames, returns the longest common leading component"
|
|
if not m: return ''
|
|
s1 = min(m)
|
|
s2 = max(m)
|
|
for i, c in enumerate(s1):
|
|
if c != s2[i]:
|
|
return s1[:i]
|
|
return s1
|
|
|
|
# Split a path in root and extension.
|
|
# The extension is everything starting at the last dot in the last
|
|
# pathname component; the root is everything before that.
|
|
# It is always true that root + ext == p.
|
|
|
|
# Generic implementation of splitext, to be parametrized with
|
|
# the separators
|
|
def _splitext(p, sep, altsep, extsep):
|
|
"""Split the extension from a pathname.
|
|
|
|
Extension is everything from the last dot to the end, ignoring
|
|
leading dots. Returns "(root, ext)"; ext may be empty."""
|
|
# NOTE: This code must work for text and bytes strings.
|
|
|
|
sepIndex = p.rfind(sep)
|
|
if altsep:
|
|
altsepIndex = p.rfind(altsep)
|
|
sepIndex = max(sepIndex, altsepIndex)
|
|
|
|
dotIndex = p.rfind(extsep)
|
|
if dotIndex > sepIndex:
|
|
# skip all leading dots
|
|
filenameIndex = sepIndex + 1
|
|
while filenameIndex < dotIndex:
|
|
if p[filenameIndex:filenameIndex+1] != extsep:
|
|
return p[:dotIndex], p[dotIndex:]
|
|
filenameIndex += 1
|
|
|
|
return p, p[:0]
|