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class AbsPath:
_components = None
def __init__(self, path = None, components = None):
if path is not None and components is not None:
raise ValueError('Both path and components provided')
if path is not None:
if isinstance(path, str):
path = path.encode('utf-8')
if len(path) < 1 or not path.startswith(b'/'):
raise ValueError('Path does not look like valid absolute path', path)
components = list(filter(lambda x: len(x) > 0 and x != b'.', path[1:].split(b'/')))
if b'..' in components:
raise ValueError('Parent references are not allowed', path)
self._components = components
def __bytes__(self):
return self.path
def __repr__(self):
return self.path.decode('utf-8', errors = 'backslashreplace')
def __contains__(self, item):
c = self.components
ci = item.components
if len(ci) >= len(c) and ci[:len(c)] == c:
return True
return False
def __eq__(self, other):
return self.components == other.components
def __len__(self):
return len(self.components)
@property
def path(self):
return b'/' + b'/'.join(self.components)
@property
def components(self):
"""
Return a list of path components.
Note that root does not count as a component, so a path of b'/' returns
an empty list.
"""
return self._components
def reparent(self, src, dst):
if not self in src:
raise ValueError('Path not in parent', self, src)
tail = self.components[len(src):]
return AbsPath(components = dst.components + tail)
ROOT = AbsPath('/')
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