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glob.py
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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)