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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/.
from __future__ import absolute_import
import posixpath
import os
import re
'''
Like 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 os.path.
'''
def normsep(path):
'''
Normalize path separators, by using forward slashes instead of whatever
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:
p = re.escape(pattern)
p = re.sub(r'(^|\\\/)\\\*\\\*\\\/', r'\1(?:.+/)?', p)
p = re.sub(r'(^|\\\/)\\\*\\\*$', r'(?:\1.+)?', p)
p = p.replace(r'\*', '[^/]*') + '(?:/.*)?$'
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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