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"""Filename globbing utility."""
import sys
import os
import re
import fnmatch
try:
_unicode = unicode
except NameError:
# If Python is built without Unicode support, the unicode type
# will not exist. Fake one.
class _unicode(object):
pass
__all__ = ["glob", "iglob"]
def glob(pathname):
"""Return a list of paths matching a pathname pattern.
The pattern may contain simple shell-style wildcards a la
fnmatch. However, unlike fnmatch, filenames starting with a
dot are special cases that are not matched by '*' and '?'
patterns.
"""
return list(iglob(pathname))
def iglob(pathname):
"""Return an iterator which yields the paths matching a pathname pattern.
The pattern may contain simple shell-style wildcards a la
fnmatch. However, unlike fnmatch, filenames starting with a
dot are special cases that are not matched by '*' and '?'
patterns.
"""
dirname, basename = os.path.split(pathname)
if not has_magic(pathname):
if basename:
if os.path.lexists(pathname):
yield pathname
else:
# Patterns ending with a slash should match only directories
if os.path.isdir(dirname):
yield pathname
return
if not dirname:
for name in glob1(os.curdir, basename):
yield name
return
# `os.path.split()` returns the argument itself as a dirname if it is a
# drive or UNC path. Prevent an infinite recursion if a drive or UNC path
# contains magic characters (i.e. r'\\?\C:').
if dirname != pathname and has_magic(dirname):
dirs = iglob(dirname)
else:
dirs = [dirname]
if has_magic(basename):
glob_in_dir = glob1
else:
glob_in_dir = glob0
for dirname in dirs:
for name in glob_in_dir(dirname, basename):
yield os.path.join(dirname, name)
# These 2 helper functions non-recursively glob inside a literal directory.
# They return a list of basenames. `glob1` accepts a pattern while `glob0`
# takes a literal basename (so it only has to check for its existence).
def glob1(dirname, pattern):
if not dirname:
dirname = os.curdir
if isinstance(pattern, _unicode) and not isinstance(dirname, unicode):
dirname = unicode(dirname, sys.getfilesystemencoding() or
sys.getdefaultencoding())
try:
names = os.listdir(dirname)
except os.error:
return []
if pattern[0] != '.':
names = filter(lambda x: x[0] != '.', names)
return fnmatch.filter(names, pattern)
def glob0(dirname, basename):
if basename == '':
# `os.path.split()` returns an empty basename for paths ending with a
# directory separator. 'q*x/' should match only directories.
if os.path.isdir(dirname):
return [basename]
else:
if os.path.lexists(os.path.join(dirname, basename)):
return [basename]
return []
magic_check = re.compile('[*?[]')
def has_magic(s):
return magic_check.search(s) is not None