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739a0defb2
MozReview-Commit-ID: 91cm9XJROy0 --HG-- extra : rebase_source : 1ab1ce1063096651f9095fd221656c852b6892d8
147 lines
3.9 KiB
Python
147 lines
3.9 KiB
Python
# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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'''
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Like :py:mod:`os.path`, with a reduced set of functions, and with normalized path
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separators (always use forward slashes).
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Also contains a few additional utilities not found in :py:mod:`os.path`.
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'''
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from __future__ import absolute_import
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import posixpath
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import os
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import re
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def normsep(path):
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'''
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Normalize path separators, by using forward slashes instead of whatever
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:py:const:`os.sep` is.
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'''
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if os.sep != '/':
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path = path.replace(os.sep, '/')
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if os.altsep and os.altsep != '/':
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path = path.replace(os.altsep, '/')
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return path
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def relpath(path, start):
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rel = normsep(os.path.relpath(path, start))
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return '' if rel == '.' else rel
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def realpath(path):
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return normsep(os.path.realpath(path))
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def abspath(path):
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return normsep(os.path.abspath(path))
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def join(*paths):
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return normsep(os.path.join(*paths))
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def normpath(path):
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return posixpath.normpath(normsep(path))
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def dirname(path):
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return posixpath.dirname(normsep(path))
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def commonprefix(paths):
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return posixpath.commonprefix([normsep(path) for path in paths])
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def basename(path):
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return os.path.basename(path)
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def splitext(path):
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return posixpath.splitext(normsep(path))
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def split(path):
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'''
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Return the normalized path as a list of its components.
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``split('foo/bar/baz')`` returns ``['foo', 'bar', 'baz']``
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'''
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return normsep(path).split('/')
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def basedir(path, bases):
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'''
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Given a list of directories (`bases`), return which one contains the given
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path. If several matches are found, the deepest base directory is returned.
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``basedir('foo/bar/baz', ['foo', 'baz', 'foo/bar'])`` returns ``'foo/bar'``
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(`'foo'` and `'foo/bar'` both match, but `'foo/bar'` is the deepest match)
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'''
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path = normsep(path)
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bases = [normsep(b) for b in bases]
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if path in bases:
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return path
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for b in sorted(bases, reverse=True):
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if b == '' or path.startswith(b + '/'):
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return b
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re_cache = {}
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def match(path, pattern):
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'''
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Return whether the given path matches the given pattern.
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An asterisk can be used to match any string, including the null string, in
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one part of the path:
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``foo`` matches ``*``, ``f*`` or ``fo*o``
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However, an asterisk matching a subdirectory may not match the null string:
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``foo/bar`` does *not* match ``foo/*/bar``
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If the pattern matches one of the ancestor directories of the path, the
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patch is considered matching:
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``foo/bar`` matches ``foo``
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Two adjacent asterisks can be used to match files and zero or more
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directories and subdirectories.
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``foo/bar`` matches ``foo/**/bar``, or ``**/bar``
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'''
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if not pattern:
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return True
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if pattern not in re_cache:
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p = re.escape(pattern)
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p = re.sub(r'(^|\\\/)\\\*\\\*\\\/', r'\1(?:.+/)?', p)
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p = re.sub(r'(^|\\\/)\\\*\\\*$', r'(?:\1.+)?', p)
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p = p.replace(r'\*', '[^/]*') + '(?:/.*)?$'
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re_cache[pattern] = re.compile(p)
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return re_cache[pattern].match(path) is not None
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def rebase(oldbase, base, relativepath):
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'''
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Return `relativepath` relative to `base` instead of `oldbase`.
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'''
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if base == oldbase:
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return relativepath
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if len(base) < len(oldbase):
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assert basedir(oldbase, [base]) == base
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relbase = relpath(oldbase, base)
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result = join(relbase, relativepath)
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else:
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assert basedir(base, [oldbase]) == oldbase
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relbase = relpath(base, oldbase)
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result = relpath(relativepath, relbase)
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result = normpath(result)
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if relativepath.endswith('/') and not result.endswith('/'):
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result += '/'
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return result
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