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Save
Rename
"""Filename globbing utility.""" import contextlib import os import re import fnmatch import functools import itertools import operator import stat import sys __all__ = ["glob", "iglob", "escape", "translate"] 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 not (include_hidden or _ishidden(pattern)): names = (x for x in names if 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 [] _deprecated_function_message = ( "{name} is deprecated and will be removed in Python {remove}. Use " "glob.glob and pass a directory to its root_dir argument instead." ) def glob0(dirname, pattern): import warnings warnings._deprecated("glob.glob0", _deprecated_function_message, remove=(3, 15)) return _glob0(dirname, pattern, None, False) def glob1(dirname, pattern): import warnings warnings._deprecated("glob.glob1", _deprecated_function_message, remove=(3, 15)) 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 _special_parts = ('', '.', '..') _dir_open_flags = os.O_RDONLY | getattr(os, 'O_DIRECTORY', 0) _no_recurse_symlinks = object() def translate(pat, *, recursive=False, include_hidden=False, seps=None): """Translate a pathname with shell wildcards to a regular expression. If `recursive` is true, the pattern segment '**' will match any number of path segments. If `include_hidden` is true, wildcards can match path segments beginning with a dot ('.'). If a sequence of separator characters is given to `seps`, they will be used to split the pattern into segments and match path separators. If not given, os.path.sep and os.path.altsep (where available) are used. """ if not seps: if os.path.altsep: seps = (os.path.sep, os.path.altsep) else: seps = os.path.sep escaped_seps = ''.join(map(re.escape, seps)) any_sep = f'[{escaped_seps}]' if len(seps) > 1 else escaped_seps not_sep = f'[^{escaped_seps}]' if include_hidden: one_last_segment = f'{not_sep}+' one_segment = f'{one_last_segment}{any_sep}' any_segments = f'(?:.+{any_sep})?' any_last_segments = '.*' else: one_last_segment = f'[^{escaped_seps}.]{not_sep}*' one_segment = f'{one_last_segment}{any_sep}' any_segments = f'(?:{one_segment})*' any_last_segments = f'{any_segments}(?:{one_last_segment})?' results = [] parts = re.split(any_sep, pat) last_part_idx = len(parts) - 1 for idx, part in enumerate(parts): if part == '*': results.append(one_segment if idx < last_part_idx else one_last_segment) elif recursive and part == '**': if idx < last_part_idx: if parts[idx + 1] != '**': results.append(any_segments) else: results.append(any_last_segments) else: if part: if not include_hidden and part[0] in '*?': results.append(r'(?!\.)') results.extend(fnmatch._translate(part, f'{not_sep}*', not_sep)) if idx < last_part_idx: results.append(any_sep) res = ''.join(results) return fr'(?s:{res})\Z' @functools.lru_cache(maxsize=512) def _compile_pattern(pat, sep, case_sensitive, recursive=True): """Compile given glob pattern to a re.Pattern object (observing case sensitivity).""" flags = re.NOFLAG if case_sensitive else re.IGNORECASE regex = translate(pat, recursive=recursive, include_hidden=True, seps=sep) return re.compile(regex, flags=flags).match class _Globber: """Class providing shell-style pattern matching and globbing. """ def __init__(self, sep, case_sensitive, case_pedantic=False, recursive=False): self.sep = sep self.case_sensitive = case_sensitive self.case_pedantic = case_pedantic self.recursive = recursive # Low-level methods lstat = operator.methodcaller('lstat') add_slash = operator.methodcaller('joinpath', '') @staticmethod def scandir(path): """Emulates os.scandir(), which returns an object that can be used as a context manager. This method is called by walk() and glob(). """ return contextlib.nullcontext(path.iterdir()) @staticmethod def concat_path(path, text): """Appends text to the given path. """ return path.with_segments(path._raw_path + text) @staticmethod def parse_entry(entry): """Returns the path of an entry yielded from scandir(). """ return entry # High-level methods def compile(self, pat): return _compile_pattern(pat, self.sep, self.case_sensitive, self.recursive) def selector(self, parts): """Returns a function that selects from a given path, walking and filtering according to the glob-style pattern parts in *parts*. """ if not parts: return self.select_exists part = parts.pop() if self.recursive and part == '**': selector = self.recursive_selector elif part in _special_parts: selector = self.special_selector elif not self.case_pedantic and magic_check.search(part) is None: selector = self.literal_selector else: selector = self.wildcard_selector return selector(part, parts) def special_selector(self, part, parts): """Returns a function that selects special children of the given path. """ select_next = self.selector(parts) def select_special(path, exists=False): path = self.concat_path(self.add_slash(path), part) return select_next(path, exists) return select_special def literal_selector(self, part, parts): """Returns a function that selects a literal descendant of a path. """ # Optimization: consume and join any subsequent literal parts here, # rather than leaving them for the next selector. This reduces the # number of string concatenation operations and calls to add_slash(). while parts and magic_check.search(parts[-1]) is None: part += self.sep + parts.pop() select_next = self.selector(parts) def select_literal(path, exists=False): path = self.concat_path(self.add_slash(path), part) return select_next(path, exists=False) return select_literal def wildcard_selector(self, part, parts): """Returns a function that selects direct children of a given path, filtering by pattern. """ match = None if part == '*' else self.compile(part) dir_only = bool(parts) if dir_only: select_next = self.selector(parts) def select_wildcard(path, exists=False): try: # We must close the scandir() object before proceeding to # avoid exhausting file descriptors when globbing deep trees. with self.scandir(path) as scandir_it: entries = list(scandir_it) except OSError: pass else: for entry in entries: if match is None or match(entry.name): if dir_only: try: if not entry.is_dir(): continue except OSError: continue entry_path = self.parse_entry(entry) if dir_only: yield from select_next(entry_path, exists=True) else: yield entry_path return select_wildcard def recursive_selector(self, part, parts): """Returns a function that selects a given path and all its children, recursively, filtering by pattern. """ # Optimization: consume following '**' parts, which have no effect. while parts and parts[-1] == '**': parts.pop() # Optimization: consume and join any following non-special parts here, # rather than leaving them for the next selector. They're used to # build a regular expression, which we use to filter the results of # the recursive walk. As a result, non-special pattern segments # following a '**' wildcard don't require additional filesystem access # to expand. follow_symlinks = self.recursive is not _no_recurse_symlinks if follow_symlinks: while parts and parts[-1] not in _special_parts: part += self.sep + parts.pop() match = None if part == '**' else self.compile(part) dir_only = bool(parts) select_next = self.selector(parts) def select_recursive(path, exists=False): path = self.add_slash(path) match_pos = len(str(path)) if match is None or match(str(path), match_pos): yield from select_next(path, exists) stack = [path] while stack: yield from select_recursive_step(stack, match_pos) def select_recursive_step(stack, match_pos): path = stack.pop() try: # We must close the scandir() object before proceeding to # avoid exhausting file descriptors when globbing deep trees. with self.scandir(path) as scandir_it: entries = list(scandir_it) except OSError: pass else: for entry in entries: is_dir = False try: if entry.is_dir(follow_symlinks=follow_symlinks): is_dir = True except OSError: pass if is_dir or not dir_only: entry_path = self.parse_entry(entry) if match is None or match(str(entry_path), match_pos): if dir_only: yield from select_next(entry_path, exists=True) else: # Optimization: directly yield the path if this is # last pattern part. yield entry_path if is_dir: stack.append(entry_path) return select_recursive def select_exists(self, path, exists=False): """Yields the given path, if it exists. """ if exists: # Optimization: this path is already known to exist, e.g. because # it was returned from os.scandir(), so we skip calling lstat(). yield path else: try: self.lstat(path) yield path except OSError: pass class _StringGlobber(_Globber): lstat = staticmethod(os.lstat) scandir = staticmethod(os.scandir) parse_entry = operator.attrgetter('path') concat_path = operator.add if os.name == 'nt': @staticmethod def add_slash(pathname): tail = os.path.splitroot(pathname)[2] if not tail or tail[-1] in '\\/': return pathname return f'{pathname}\\' else: @staticmethod def add_slash(pathname): if not pathname or pathname[-1] == '/': return pathname return f'{pathname}/'