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+"""
+Filename globbing utility. Mostly a copy of `glob` from Python 3.5.
+
+Changes include:
+ * `yield from` and PEP3102 `*` removed.
+ * Hidden files are not ignored.
+"""
+
+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)
+ if recursive and _isrecursive(pathname):
+ s = next(it) # skip empty string
+ assert not s
+ return it
+
+
+def _iglob(pathname, recursive):
+ dirname, basename = os.path.split(pathname)
+ glob_in_dir = glob2 if recursive and _isrecursive(basename) else glob1
+
+ if not has_magic(pathname):
+ 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:
+ yield from glob_in_dir(dirname, basename)
+ 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)
+ else:
+ dirs = [dirname]
+ if not has_magic(basename):
+ glob_in_dir = glob0
+ for dirname in dirs:
+ for name in glob_in_dir(dirname, basename):
+ 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):
+ if not dirname:
+ if isinstance(pattern, bytes):
+ dirname = os.curdir.encode('ASCII')
+ else:
+ dirname = os.curdir
+ try:
+ names = os.listdir(dirname)
+ except OSError:
+ return []
+ return fnmatch.filter(names, pattern)
+
+
+def glob0(dirname, basename):
+ 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 []
+
+
+# This helper function recursively yields relative pathnames inside a literal
+# directory.
+
+
+def glob2(dirname, pattern):
+ assert _isrecursive(pattern)
+ yield pattern[:0]
+ for x in _rlistdir(dirname):
+ yield x
+
+
+# Recursively yields relative pathnames inside a literal directory.
+def _rlistdir(dirname):
+ if not dirname:
+ if isinstance(dirname, bytes):
+ dirname = os.curdir.encode('ASCII')
+ else:
+ dirname = os.curdir
+ try:
+ names = os.listdir(dirname)
+ except os.error:
+ return
+ for x in names:
+ yield x
+ path = os.path.join(dirname, x) if dirname else x
+ for y in _rlistdir(path):
+ 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 _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