"""

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Path operations common to more than one OS

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Do not use directly. The OS specific modules import the appropriate

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functions from this module themselves.

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"""

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import os

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import stat

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__all__ = ['commonprefix', 'exists', 'getatime', 'getctime', 'getmtime',

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'getsize', 'isdir', 'isfile']

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try:

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_unicode = unicode

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except NameError:

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# If Python is built without Unicode support, the unicode type

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# will not exist. Fake one.

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class _unicode(object):

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pass

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# Does a path exist?

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# This is false for dangling symbolic links on systems that support them.

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def exists(path):

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"""Test whether a path exists. Returns False for broken symbolic links"""

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try:

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os.stat(path)

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except os.error:

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return False

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return True

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# This follows symbolic links, so both islink() and isdir() can be true

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# for the same path on systems that support symlinks

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def isfile(path):

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"""Test whether a path is a regular file"""

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try:

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st = os.stat(path)

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except os.error:

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return False

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return stat.S_ISREG(st.st_mode)

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# Is a path a directory?

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# This follows symbolic links, so both islink() and isdir()

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# can be true for the same path on systems that support symlinks

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def isdir(s):

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"""Return true if the pathname refers to an existing directory."""

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try:

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st = os.stat(s)

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except os.error:

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return False

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return stat.S_ISDIR(st.st_mode)

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def getsize(filename):

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"""Return the size of a file, reported by os.stat()."""

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return os.stat(filename).st_size

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def getmtime(filename):

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"""Return the last modification time of a file, reported by os.stat()."""

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return os.stat(filename).st_mtime

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def getatime(filename):

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"""Return the last access time of a file, reported by os.stat()."""

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return os.stat(filename).st_atime

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def getctime(filename):

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"""Return the metadata change time of a file, reported by os.stat()."""

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return os.stat(filename).st_ctime

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# Return the longest prefix of all list elements.

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def commonprefix(m):

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"Given a list of pathnames, returns the longest common leading component"

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if not m: return ''

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s1 = min(m)

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s2 = max(m)

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for i, c in enumerate(s1):

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if c != s2[i]:

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return s1[:i]

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return s1

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# Split a path in root and extension.

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# The extension is everything starting at the last dot in the last

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# pathname component; the root is everything before that.

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# It is always true that root + ext == p.

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# Generic implementation of splitext, to be parametrized with

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# the separators

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def _splitext(p, sep, altsep, extsep):

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"""Split the extension from a pathname.

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Extension is everything from the last dot to the end, ignoring

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leading dots. Returns "(root, ext)"; ext may be empty."""

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sepIndex = p.rfind(sep)

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if altsep:

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altsepIndex = p.rfind(altsep)

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sepIndex = max(sepIndex, altsepIndex)

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dotIndex = p.rfind(extsep)

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if dotIndex > sepIndex:

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# skip all leading dots

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filenameIndex = sepIndex + 1

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while filenameIndex < dotIndex:

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if p[filenameIndex] != extsep:

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return p[:dotIndex], p[dotIndex:]

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filenameIndex += 1

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return p, ''

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