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"""Filename globbing utility."""
import glob as _glob
import os
import os.path
import re
_GLOBSTAR = "**"
_CONTAINS_GLOB_PATTERN = re.compile("[*?[]")
def is_glob_pattern(string):
"""Return true if 'string' represents a glob pattern, and false otherwise."""
# Copied from glob.has_magic().
return _CONTAINS_GLOB_PATTERN.search(string) is not None
def glob(globbed_pathname):
"""Return a list of pathnames matching the 'globbed_pathname' pattern.
In addition to containing simple shell-style wildcards a la fnmatch,
the pattern may also contain globstars ("**"), which is recursively
expanded to match zero or more subdirectories.
"""
return list(iglob(globbed_pathname))
def iglob(globbed_pathname):
"""Emit a list of pathnames matching the 'globbed_pathname' pattern.
In addition to containing simple shell-style wildcards a la fnmatch,
the pattern may also contain globstars ("**"), which is recursively
expanded to match zero or more subdirectories.
"""
parts = _split_path(globbed_pathname)
parts = _canonicalize(parts)
index = _find_globstar(parts)
if index == -1:
for pathname in _glob.iglob(globbed_pathname):
# Normalize 'pathname' so exact string comparison can be used later.
yield os.path.normpath(pathname)
return
# **, **/, or **/a
if index == 0:
expand = _expand_curdir
# a/** or a/**/ or a/**/b
else:
expand = _expand
prefix_parts = parts[:index]
suffix_parts = parts[index + 1:]
prefix = os.path.join(*prefix_parts) if prefix_parts else os.curdir
suffix = os.path.join(*suffix_parts) if suffix_parts else ""
for (kind, path) in expand(prefix):
if not suffix_parts:
yield path
# Avoid following symlinks to avoid an infinite loop
elif suffix_parts and kind == "dir" and not os.path.islink(path):
path = os.path.join(path, suffix)
for pathname in iglob(path):
yield pathname
def _split_path(pathname):
"""Return 'pathname' as a list of path components."""
parts = []
while True:
(dirname, basename) = os.path.split(pathname)
parts.append(basename)
if pathname == dirname:
parts.append(dirname)
break
if not dirname:
break
pathname = dirname
parts.reverse()
return parts
def _canonicalize(parts):
"""Return a copy of 'parts' with consecutive "**"s coalesced.
Raise a ValueError for unsupported uses of "**".
"""
res = []
prev_was_globstar = False
for part in parts:
if part == _GLOBSTAR:
# Skip consecutive **'s
if not prev_was_globstar:
prev_was_globstar = True
res.append(part)
elif _GLOBSTAR in part: # a/b**/c or a/**b/c
raise ValueError("Can only specify glob patterns of the form a/**/b")
else:
prev_was_globstar = False
res.append(part)
return res
def _find_globstar(parts):
"""Return the index of the first occurrence of "**" in 'parts'.
Return -1 if "**" is not found in the list.
"""
for (idx, part) in enumerate(parts):
if part == _GLOBSTAR:
return idx
return -1
def _list_dir(pathname):
"""Return a pair of subdirectory names and filenames contained within the 'pathname' directory.
If 'pathname' does not exist, then None is returned.
"""
try:
(_root, dirs, files) = next(os.walk(pathname))
return (dirs, files)
except StopIteration:
return None # 'pathname' directory does not exist
def _expand(pathname):
"""Emit tuples of the form ("dir", dirname) and ("file", filename).
The result is for all directories and files contained within the 'pathname' directory.
"""
res = _list_dir(pathname)
if res is None:
return
(dirs, files) = res
# Zero expansion
if os.path.basename(pathname):
yield ("dir", os.path.join(pathname, ""))
for fname in files:
path = os.path.join(pathname, fname)
yield ("file", path)
for dname in dirs:
path = os.path.join(pathname, dname)
for xpath in _expand(path):
yield xpath
def _expand_curdir(pathname):
"""Emit tuples of the form ("dir", dirname) and ("file", filename).
The result is for all directories and files contained within the 'pathname' directory.
The returned pathnames omit a "./" prefix.
"""
res = _list_dir(pathname)
if res is None:
return
(dirs, files) = res
# Zero expansion
yield ("dir", "")
for fname in files:
yield ("file", fname)
for dname in dirs:
for xdir in _expand(dname):
yield xdir
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