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"""Filename globbing utility."""

import os

import re

import fnmatch

__all__ = ["glob", "iglob", "escape"]

def glob(pathname, *, recursive=False):

"""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.

If recursive is true, the pattern '**' will match any files and

zero or more directories and subdirectories.

"""

return list(iglob(pathname, recursive=recursive))

def iglob(pathname, *, recursive=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.

"""

it = _iglob(pathname, recursive, False)

if recursive and _isrecursive(pathname):

s = next(it) # skip empty string

assert not s

return it

def _iglob(pathname, recursive, dironly):

dirname, basename = os.path.split(pathname)

if not has_magic(pathname):

assert not dironly

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:

if recursive and _isrecursive(basename):

yield from _glob2(dirname, basename, dironly)

else:

yield from _glob1(dirname, basename, dironly)

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, recursive, True)

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(dirname, basename, dironly):

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, dironly):

names = list(_iterdir(dirname, dironly))

if not _ishidden(pattern):

names = (x for x in names if not _ishidden(x))

return fnmatch.filter(names, pattern)

def _glob0(dirname, basename, dironly):

if not 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 []

# Following functions are not public but can be used by third-party code.

def glob0(dirname, pattern):

return _glob0(dirname, pattern, False)

def glob1(dirname, pattern):

return _glob1(dirname, pattern, False)

# This helper function recursively yields relative pathnames inside a literal

# directory.

def _glob2(dirname, pattern, dironly):

assert _isrecursive(pattern)

yield pattern[:0]

yield from _rlistdir(dirname, dironly)

# If dironly is false, yields all file names inside a directory.

# If dironly is true, yields only directory names.

def _iterdir(dirname, dironly):

if not dirname:

if isinstance(dirname, bytes):

dirname = bytes(os.curdir, 'ASCII')

else:

dirname = os.curdir

try:

with os.scandir(dirname) as it:

for entry in it:

try:

if not dironly or entry.is_dir():

yield entry.name

except OSError:

pass

except OSError:

return

# Recursively yields relative pathnames inside a literal directory.

def _rlistdir(dirname, dironly):

names = list(_iterdir(dirname, dironly))

for x in names:

if not _ishidden(x):

yield x

path = os.path.join(dirname, x) if dirname else x

for y in _rlistdir(path, dironly):

yield os.path.join(x, y)

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

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