| """license: Apache License 2.0, see LICENSE for more details.""" |
| def normpath(path, trailing=False): |
| """Normalize path, eliminating double slashes, etc.""" |
| comps = path.split('/') |
| new_comps = [] |
| for comp in comps: |
| if comp == '': |
| continue |
| if comp in ('.', '..'): |
| raise ValueError('relative paths not allowed') |
| new_comps.append(comp) |
| new_path = '/'.join(new_comps) |
| if trailing is True and path.endswith('/'): |
| new_path += '/' |
| if path.startswith('/'): |
| return '/' + new_path |
| return new_path |
| |
| |
| def join(a, *p): |
| """Join two or more pathname components, inserting '/' as needed. |
| |
| If any component is an absolute path, all previous path components |
| will be discarded. |
| |
| """ |
| path = a |
| for b in p: |
| if b.startswith('/'): |
| path = b |
| elif path == '' or path.endswith('/'): |
| path += b |
| else: |
| path += '/' + b |
| return path |
| |
| |
| def isabs(s): |
| """Test whether a path is absolute""" |
| return s.startswith('/') |
| |
| |
| def basename(p): |
| """Returns the final component of a pathname""" |
| i = p.rfind('/') + 1 |
| return p[i:] |
| |
| |
| def _prefix_root(root, path, trailing=False): |
| """Prepend a root to a path. """ |
| return normpath(join(_norm_root(root), path.lstrip('/')), trailing=trailing) |
| |
| |
| def _norm_root(root): |
| return normpath(join('/', root)) |
