mirror of https://github.com/python/cpython
111 lines
3.1 KiB
Python
111 lines
3.1 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 fnmatch.
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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 fnmatch.
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"""
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if not has_magic(pathname):
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if os.path.lexists(pathname):
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yield pathname
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return
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pathnames = expand_braces(pathname)
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for pathname in pathnames:
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dirname, basename = os.path.split(pathname)
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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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if 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 os.error:
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return []
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if pattern[0] != '.':
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names = [x for x in names if x[0] != '.']
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return fnmatch.filter(names, pattern)
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def glob0(dirname, basename):
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if 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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brace_matcher = re.compile(r'.*(\{.+?[^\\]\})')
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def expand_braces(text):
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"""Find the rightmost, innermost set of braces and, if it contains a
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comma-separated list, expand its contents recursively (any of its items
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may itself be a list enclosed in braces).
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Return the full set of expanded strings.
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"""
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res = set()
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match = brace_matcher.search(text)
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if match is not None:
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sub = match.group(1)
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open_brace, close_brace = match.span(1)
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if "," in sub:
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for pat in sub.strip('{}').split(','):
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res.update(expand_braces(text[:open_brace] + pat + text[close_brace:]))
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else:
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res.update(expand_braces(text[:open_brace] + sub.replace('}', '\\}') + text[close_brace:]))
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else:
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res.add(text.replace('\\}', '}'))
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return res
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