| import platform |
| import os |
| |
| from six import BytesIO |
| |
| def rel_path_to_url(rel_path, url_base="/"): |
| assert not os.path.isabs(rel_path) |
| if url_base[0] != "/": |
| url_base = "/" + url_base |
| if url_base[-1] != "/": |
| url_base += "/" |
| return url_base + rel_path.replace(os.sep, "/") |
| |
| |
| def from_os_path(path): |
| assert os.path.sep == "/" or platform.system() == "Windows" |
| rv = path.replace(os.path.sep, "/") |
| if "\\" in rv: |
| raise ValueError("path contains \\ when separator is %s" % os.path.sep) |
| return rv |
| |
| |
| def to_os_path(path): |
| assert os.path.sep == "/" or platform.system() == "Windows" |
| if "\\" in path: |
| raise ValueError("normalised path contains \\") |
| return path.replace("/", os.path.sep) |
| |
| |
| class ContextManagerBytesIO(BytesIO): |
| def __enter__(self): |
| return self |
| |
| def __exit__(self, *args, **kwargs): |
| self.close() |
| |
| |
| class cached_property(object): |
| def __init__(self, func): |
| self.func = func |
| self.__doc__ = getattr(func, "__doc__") |
| self.name = func.__name__ |
| |
| def __get__(self, obj, cls=None): |
| if obj is None: |
| return self |
| |
| if self.name not in obj.__dict__: |
| obj.__dict__[self.name] = self.func(obj) |
| obj.__dict__.setdefault("__cached_properties__", set()).add(self.name) |
| return obj.__dict__[self.name] |
