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import platform
import os
from six import BytesIO
def rel_path_to_url(rel_path, url_base="/"):
assert not os.path.isabs(rel_path), 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"
if "/" == os.path.sep:
rv = path
else:
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 \\")
if "/" == os.path.sep:
return path
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]
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