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v0.5.1
https://github.com/python/cpython
09 December 2020, 11:06:31 UTC
Revision 8c83ec63f59b5a9512f907aa4f2c63d3ed7af7a0 authored by cvs2svn on 16 April 2001, 02:07:08 UTC, committed by cvs2svn on 16 April 2001, 02:07:08 UTC 
This commit was manufactured by cvs2svn to create tag 'r21c2'.
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Tip revision: 8c83ec63f59b5a9512f907aa4f2c63d3ed7af7a0 authored by cvs2svn on 16 April 2001, 02:07:08 UTC
This commit was manufactured by cvs2svn to create tag 'r21c2'.
Tip revision: 8c83ec6
maccache.py 
# Module 'maccache'
#
# Maintain a cache of listdir(), isdir(), isfile() or exists() outcomes.
# XXX Should merge with module statcache

import os


# The cache.
# Keys are absolute pathnames;
# values are 0 (nothing), 1 (file) or [...] (dir).
#
cache = {}


# Current working directory.
#
cwd = os.getcwd()


# Constants.
#
NONE = 0
FILE = 1
LISTTYPE = type([])

def _stat(name):
	name = os.path.join(cwd, name)
	if cache.has_key(name):
		return cache[name]
	if os.path.isfile(name):
		cache[name] = FILE
		return FILE
	try:
		list = os.listdir(name)
	except:
		cache[name] = NONE
		return NONE
	cache[name] = list
	if name[-1:] == ':': cache[name[:-1]] = list
	else: cache[name+':'] = list
	return list

def isdir(name):
	st = _stat(name)
	return type(st) == LISTTYPE

def isfile(name):
	st = _stat(name)
	return st == FILE

def exists(name):
	st = _stat(name)
	return st <> NONE

def listdir(name):
	st = _stat(name)
	if type(st) == LISTTYPE:
		return st
	else:
		raise RuntimeError, 'list non-directory'
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