On Sat, 29 Mar 2003, Ka-Ping Yee wrote:
> Okay, at last to the example, then.
The following is a better formulation in the capability style --
please ignore the previous one.
The previously posted code allows names to carry authority, which
is a big no-no. This code gets rid of names altogether in the API
for file access; it's better to deal with just objects.
import os, __builtin__
class Namespace:
def __init__(self, *args, **kw):
for value in args:
self.__dict__[value.__name__] = value
for name, value in kw.items():
self.__dict__[name] = value
class ImmutableNamespace(Namespace):
def __setattr__(self, name, value):
raise TypeError('read-only namespace')
def ReadStream(file, name):
def __repr__():
return '<ReadStream %r>' % name
return ImmutableNamespace(__repr__, file.read, file.close, name=name)
def FileReader(path, name):
def __repr__():
return '<FileReader %r>' % name
def open():
return ReadStream(__builtin__.open(path, 'r'), name)
def getsize():
return os.path.getsize(path)
def getmtime():
return os.path.getmtime(path)
return ImmutableNamespace(__repr__, open, getsize, getmtime, name=name)
def DirectoryReader(path, name):
def __repr__():
return '<DirectoryReader %r>' % name
def getfiles():
files = []
for name in os.listdir(path):
fullpath = os.path.join(path, name)
if os.path.isfile(fullpath):
files.append(FileReader(fullpath, name))
return files
def getdirs():
dirs = []
for name in os.listdir(path):
fullpath = os.path.join(path, name)
if os.path.isdir(fullpath):
dirs.append(DirectoryReader(fullpath, name))
return dirs
return ImmutableNamespace(__repr__, getfiles, getdirs, name=name)
-- ?!ng
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