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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
'''
Like :py:mod:`os.path`, with a reduced set of functions, and with normalized
path separators (always use forward slashes).
Also contains a few additional utilities not found in :py:mod:`os.path`.
'''
from __future__ import absolute_import
import posixpath
import os
import re
def normsep(path):
'''
Normalize path separators, by using forward slashes instead of whatever
:py:const:`os.sep` is.
'''
if os.sep != '/':
path = path.replace(os.sep, '/')
if os.altsep and os.altsep != '/':
path = path.replace(os.altsep, '/')
return path
def relpath(path, start):
rel = normsep(os.path.relpath(path, start))
return '' if rel == '.' else rel
def realpath(path):
return normsep(os.path.realpath(path))
def abspath(path):
return normsep(os.path.abspath(path))
def join(*paths):
return normsep(os.path.join(*paths))
def normpath(path):
return posixpath.normpath(normsep(path))
def dirname(path):
return posixpath.dirname(normsep(path))
def commonprefix(paths):
return posixpath.commonprefix([normsep(path) for path in paths])
def basename(path):
return os.path.basename(path)
def splitext(path):
return posixpath.splitext(normsep(path))
def split(path):
'''
Return the normalized path as a list of its components.
``split('foo/bar/baz')`` returns ``['foo', 'bar', 'baz']``
'''
return normsep(path).split('/')
def basedir(path, bases):
'''
Given a list of directories (`bases`), return which one contains the given
path. If several matches are found, the deepest base directory is returned.
``basedir('foo/bar/baz', ['foo', 'baz', 'foo/bar'])`` returns ``'foo/bar'``
(`'foo'` and `'foo/bar'` both match, but `'foo/bar'` is the deepest match)
'''
path = normsep(path)
bases = [normsep(b) for b in bases]
if path in bases:
return path
for b in sorted(bases, reverse=True):
if b == '' or path.startswith(b + '/'):
return b
re_cache = {}
def match(path, pattern):
'''
Return whether the given path matches the given pattern.
An asterisk can be used to match any string, including the null string, in
one part of the path:
``foo`` matches ``*``, ``f*`` or ``fo*o``
However, an asterisk matching a subdirectory may not match the null string:
``foo/bar`` does *not* match ``foo/*/bar``
If the pattern matches one of the ancestor directories of the path, the
patch is considered matching:
``foo/bar`` matches ``foo``
Two adjacent asterisks can be used to match files and zero or more
directories and subdirectories.
``foo/bar`` matches ``foo/**/bar``, or ``**/bar``
'''
if not pattern:
return True
if pattern not in re_cache:
last_end = 0
p = ''
for m in re.finditer(r'(?:(^|/)\*\*(/|$))|(?P<star>\*)', pattern):
if m.start() > last_end:
p += re.escape(pattern[last_end:m.start()])
if m.group('star'):
p += '[^/]*'
elif m.group(2):
p += re.escape(m.group(1)) + r'(?:.+%s)?' % m.group(2)
else:
p += r'(?:%s.+)?' % re.escape(m.group(1))
last_end = m.end()
p += re.escape(pattern[last_end:]) + '(?:/.*)?$'
re_cache[pattern] = re.compile(p)
return re_cache[pattern].match(path) is not None
def rebase(oldbase, base, relativepath):
'''
Return `relativepath` relative to `base` instead of `oldbase`.
'''
if base == oldbase:
return relativepath
if len(base) < len(oldbase):
assert basedir(oldbase, [base]) == base
relbase = relpath(oldbase, base)
result = join(relbase, relativepath)
else:
assert basedir(base, [oldbase]) == oldbase
relbase = relpath(base, oldbase)
result = relpath(relativepath, relbase)
result = normpath(result)
if relativepath.endswith('/') and not result.endswith('/'):
result += '/'
return result
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