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111 lines
3.4 KiB
Python
111 lines
3.4 KiB
Python
"""Filename globbing utility."""
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import os
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import re
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import fnmatch
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__all__ = ["glob", "iglob"]
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def glob(pathname):
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"""Return a list of paths matching a pathname pattern.
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The pattern may contain simple shell-style wildcards a la
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fnmatch. However, unlike fnmatch, filenames starting with a
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dot are special cases that are not matched by '*' and '?'
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patterns.
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"""
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return list(iglob(pathname))
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def iglob(pathname):
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"""Return an iterator which yields the paths matching a pathname pattern.
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The pattern may contain simple shell-style wildcards a la
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fnmatch. However, unlike fnmatch, filenames starting with a
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dot are special cases that are not matched by '*' and '?'
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patterns.
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"""
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dirname, basename = os.path.split(pathname)
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if not has_magic(pathname):
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if basename:
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if os.path.lexists(pathname):
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yield pathname
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else:
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# Patterns ending with a slash should match only directories
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if os.path.isdir(dirname):
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yield pathname
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return
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if not dirname:
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yield from glob1(None, basename)
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return
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# `os.path.split()` returns the argument itself as a dirname if it is a
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# drive or UNC path. Prevent an infinite recursion if a drive or UNC path
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# contains magic characters (i.e. r'\\?\C:').
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if dirname != pathname and has_magic(dirname):
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dirs = iglob(dirname)
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else:
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dirs = [dirname]
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if has_magic(basename):
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glob_in_dir = glob1
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else:
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glob_in_dir = glob0
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for dirname in dirs:
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for name in glob_in_dir(dirname, basename):
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yield os.path.join(dirname, name)
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# These 2 helper functions non-recursively glob inside a literal directory.
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# They return a list of basenames. `glob1` accepts a pattern while `glob0`
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# takes a literal basename (so it only has to check for its existence).
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def glob1(dirname, pattern):
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if not dirname:
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if isinstance(pattern, bytes):
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dirname = bytes(os.curdir, 'ASCII')
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else:
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dirname = os.curdir
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try:
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names = os.listdir(dirname)
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except OSError:
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return []
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if not _ishidden(pattern):
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names = [x for x in names if not _ishidden(x)]
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return fnmatch.filter(names, pattern)
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def glob0(dirname, basename):
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if not basename:
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# `os.path.split()` returns an empty basename for paths ending with a
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# directory separator. 'q*x/' should match only directories.
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if os.path.isdir(dirname):
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return [basename]
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else:
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if os.path.lexists(os.path.join(dirname, basename)):
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return [basename]
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return []
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magic_check = re.compile('([*?[])')
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magic_check_bytes = re.compile(b'([*?[])')
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def has_magic(s):
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if isinstance(s, bytes):
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match = magic_check_bytes.search(s)
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else:
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match = magic_check.search(s)
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return match is not None
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def _ishidden(path):
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return path[0] in ('.', b'.'[0])
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def escape(pathname):
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"""Escape all special characters.
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"""
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# Escaping is done by wrapping any of "*?[" between square brackets.
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# Metacharacters do not work in the drive part and shouldn't be escaped.
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drive, pathname = os.path.splitdrive(pathname)
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if isinstance(pathname, bytes):
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pathname = magic_check_bytes.sub(br'[\1]', pathname)
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else:
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pathname = magic_check.sub(r'[\1]', pathname)
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return drive + pathname
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