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glob.py
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252 lines (220 loc) · 8.53 KB
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"""Filename globbing utility."""
import contextlib
import os
import re
import fnmatch
import itertools
import stat
import sys
__all__ = ["glob", "iglob", "escape"]
def glob(pathname, *, root_dir=None, dir_fd=None, recursive=False,
include_hidden=False):
"""Return a list of paths matching a pathname pattern.
The pattern may contain simple shell-style wildcards a la
fnmatch. Unlike fnmatch, filenames starting with a
dot are special cases that are not matched by '*' and '?'
patterns by default.
If `include_hidden` is true, the patterns '*', '?', '**' will match hidden
directories.
If `recursive` is true, the pattern '**' will match any files and
zero or more directories and subdirectories.
"""
return list(iglob(pathname, root_dir=root_dir, dir_fd=dir_fd, recursive=recursive,
include_hidden=include_hidden))
def iglob(pathname, *, root_dir=None, dir_fd=None, recursive=False,
include_hidden=False):
"""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.
If recursive is true, the pattern '**' will match any files and
zero or more directories and subdirectories.
"""
sys.audit("glob.glob", pathname, recursive)
sys.audit("glob.glob/2", pathname, recursive, root_dir, dir_fd)
if root_dir is not None:
root_dir = os.fspath(root_dir)
else:
root_dir = pathname[:0]
it = _iglob(pathname, root_dir, dir_fd, recursive, False,
include_hidden=include_hidden)
if not pathname or recursive and _isrecursive(pathname[:2]):
try:
s = next(it) # skip empty string
if s:
it = itertools.chain((s,), it)
except StopIteration:
pass
return it
def _iglob(pathname, root_dir, dir_fd, recursive, dironly,
include_hidden=False):
dirname, basename = os.path.split(pathname)
if not has_magic(pathname):
assert not dironly
if basename:
if _lexists(_join(root_dir, pathname), dir_fd):
yield pathname
else:
# Patterns ending with a slash should match only directories
if _isdir(_join(root_dir, dirname), dir_fd):
yield pathname
return
if not dirname:
if recursive and _isrecursive(basename):
yield from _glob2(root_dir, basename, dir_fd, dironly,
include_hidden=include_hidden)
else:
yield from _glob1(root_dir, basename, dir_fd, dironly,
include_hidden=include_hidden)
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, root_dir, dir_fd, recursive, True,
include_hidden=include_hidden)
else:
dirs = [dirname]
if has_magic(basename):
if recursive and _isrecursive(basename):
glob_in_dir = _glob2
else:
glob_in_dir = _glob1
else:
glob_in_dir = _glob0
for dirname in dirs:
for name in glob_in_dir(_join(root_dir, dirname), basename, dir_fd, dironly,
include_hidden=include_hidden):
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, dir_fd, dironly, include_hidden=False):
names = _listdir(dirname, dir_fd, dironly)
if include_hidden or not _ishidden(pattern):
names = (x for x in names if include_hidden or not _ishidden(x))
return fnmatch.filter(names, pattern)
def _glob0(dirname, basename, dir_fd, dironly, include_hidden=False):
if basename:
if _lexists(_join(dirname, basename), dir_fd):
return [basename]
else:
# `os.path.split()` returns an empty basename for paths ending with a
# directory separator. 'q*x/' should match only directories.
if _isdir(dirname, dir_fd):
return [basename]
return []
# Following functions are not public but can be used by third-party code.
def glob0(dirname, pattern):
return _glob0(dirname, pattern, None, False)
def glob1(dirname, pattern):
return _glob1(dirname, pattern, None, False)
# This helper function recursively yields relative pathnames inside a literal
# directory.
def _glob2(dirname, pattern, dir_fd, dironly, include_hidden=False):
assert _isrecursive(pattern)
if not dirname or _isdir(dirname, dir_fd):
yield pattern[:0]
yield from _rlistdir(dirname, dir_fd, dironly,
include_hidden=include_hidden)
# If dironly is false, yields all file names inside a directory.
# If dironly is true, yields only directory names.
def _iterdir(dirname, dir_fd, dironly):
try:
fd = None
fsencode = None
if dir_fd is not None:
if dirname:
fd = arg = os.open(dirname, _dir_open_flags, dir_fd=dir_fd)
else:
arg = dir_fd
if isinstance(dirname, bytes):
fsencode = os.fsencode
elif dirname:
arg = dirname
elif isinstance(dirname, bytes):
arg = bytes(os.curdir, 'ASCII')
else:
arg = os.curdir
try:
with os.scandir(arg) as it:
for entry in it:
try:
if not dironly or entry.is_dir():
if fsencode is not None:
yield fsencode(entry.name)
else:
yield entry.name
except OSError:
pass
finally:
if fd is not None:
os.close(fd)
except OSError:
return
def _listdir(dirname, dir_fd, dironly):
with contextlib.closing(_iterdir(dirname, dir_fd, dironly)) as it:
return list(it)
# Recursively yields relative pathnames inside a literal directory.
def _rlistdir(dirname, dir_fd, dironly, include_hidden=False):
names = _listdir(dirname, dir_fd, dironly)
for x in names:
if include_hidden or not _ishidden(x):
yield x
path = _join(dirname, x) if dirname else x
for y in _rlistdir(path, dir_fd, dironly,
include_hidden=include_hidden):
yield _join(x, y)
def _lexists(pathname, dir_fd):
# Same as os.path.lexists(), but with dir_fd
if dir_fd is None:
return os.path.lexists(pathname)
try:
os.lstat(pathname, dir_fd=dir_fd)
except (OSError, ValueError):
return False
else:
return True
def _isdir(pathname, dir_fd):
# Same as os.path.isdir(), but with dir_fd
if dir_fd is None:
return os.path.isdir(pathname)
try:
st = os.stat(pathname, dir_fd=dir_fd)
except (OSError, ValueError):
return False
else:
return stat.S_ISDIR(st.st_mode)
def _join(dirname, basename):
# It is common if dirname or basename is empty
if not dirname or not basename:
return dirname or basename
return os.path.join(dirname, basename)
magic_check = re.compile('([*?[])')
magic_check_bytes = re.compile(b'([*?[])')
def has_magic(s):
if isinstance(s, bytes):
match = magic_check_bytes.search(s)
else:
match = magic_check.search(s)
return match is not None
def _ishidden(path):
return path[0] in ('.', b'.'[0])
def _isrecursive(pattern):
if isinstance(pattern, bytes):
return pattern == b'**'
else:
return pattern == '**'
def escape(pathname):
"""Escape all special characters.
"""
# Escaping is done by wrapping any of "*?[" between square brackets.
# Metacharacters do not work in the drive part and shouldn't be escaped.
drive, pathname = os.path.splitdrive(pathname)
if isinstance(pathname, bytes):
pathname = magic_check_bytes.sub(br'[\1]', pathname)
else:
pathname = magic_check.sub(r'[\1]', pathname)
return drive + pathname
_dir_open_flags = os.O_RDONLY | getattr(os, 'O_DIRECTORY', 0)