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v0.5.1
v0.5.1
https://github.com/python/cpython
Revision caa63808861d4e92d4dc1005fc01de0f2e4a8fd0 authored by Guido van Rossum on 12 January 1995, 11:45:45 UTC, committed by Guido van Rossum on 12 January 1995, 11:45:45 UTC
use the new names exclusively, and the linker will see the new names. Files that import "Python.h" also only see the new names. Files that import "allobjects.h" will continue to be able to use the old names, due to the inclusion (in allobjects.h) of "rename2.h".
1 parent 94390ec
Tip revision: caa63808861d4e92d4dc1005fc01de0f2e4a8fd0 authored by Guido van Rossum on 12 January 1995, 11:45:45 UTC
The great renaming, phase two: all header files have been updated to
The great renaming, phase two: all header files have been updated to
Tip revision: caa6380
ntpath.py
# Module 'dospath' -- common operations on DOS pathnames
import os
import stat
import string
# Normalize the case of a pathname.
# On MS-DOS it maps the pathname to lowercase, turns slashes into
# backslashes and maps invalid consecutive characters to a single '_'.
# Other normalizations (such as optimizing '../' away) are not allowed
# (this is done by normpath).
mapchar = '_'
def normcase(s):
res, s = splitdrive(s)
for c in s:
if c in '/\\':
res = res + os.sep
elif c == '.' and res[-1:] == os.sep:
res = res + mapchar + c
elif ord(c) < 32 or c in ' "*+,:;<=>?[]|':
if res[-1:] != mapchar:
res = res + mapchar
else:
res = res + c
return string.lower(res)
# Return wheter a path is absolute.
# Trivial in Posix, harder on the Mac or MS-DOS.
# For DOS it is absolute if it starts with a slash or backslash (current
# volume), or if a pathname after the volume letter and colon starts with
# a slash or backslash.
def isabs(s):
s = splitdrive(s)[1]
return s != '' and s[:1] in '/\\'
# Join two pathnames.
# Ignore the first part if the second part is absolute.
# Insert a '/' unless the first part is empty or already ends in '/'.
def join(a, b):
if isabs(b): return b
if a == '' or a[-1:] in '/\\': return a + b
# Note: join('x', '') returns 'x/'; is this what we want?
return a + os.sep + b
# Split a path in a drive specification (a drive letter followed by a
# colon) and the path specification.
# It is always true that drivespec + pathspec == p
def splitdrive(p):
if p[1:2] == ':':
return p[0:2], p[2:]
return '', p
# Split a path in head (everything up to the last '/') and tail (the
# rest). If the original path ends in '/' but is not the root, this
# '/' is stripped. After the trailing '/' is stripped, the invariant
# join(head, tail) == p holds.
# The resulting head won't end in '/' unless it is the root.
def split(p):
d, p = splitdrive(p)
slashes = ''
while p and p[-1:] in '/\\':
slashes = slashes + p[-1]
p = p[:-1]
if p == '':
p = p + slashes
head, tail = '', ''
for c in p:
tail = tail + c
if c in '/\\':
head, tail = head + tail, ''
slashes = ''
while head and head[-1:] in '/\\':
slashes = slashes + head[-1]
head = head[:-1]
if head == '':
head = head + slashes
return d + head, tail
# Split a path in root and extension.
# The extension is everything starting at the first dot in the last
# pathname component; the root is everything before that.
# It is always true that root + ext == p.
def splitext(p):
root, ext = '', ''
for c in p:
if c in '/\\':
root, ext = root + ext + c, ''
elif c == '.' or ext:
ext = ext + c
else:
root = root + c
return root, ext
# Return the tail (basename) part of a path.
def basename(p):
return split(p)[1]
# Return the head (dirname) part of a path.
def dirname(p):
return split(p)[0]
# Return the longest prefix of all list elements.
def commonprefix(m):
if not m: return ''
prefix = m[0]
for item in m:
for i in range(len(prefix)):
if prefix[:i+1] <> item[:i+1]:
prefix = prefix[:i]
if i == 0: return ''
break
return prefix
# Is a path a symbolic link?
# This will always return false on systems where posix.lstat doesn't exist.
def islink(path):
return false
# Does a path exist?
# This is false for dangling symbolic links.
def exists(path):
try:
st = os.stat(path)
except os.error:
return 0
return 1
# Is a path a dos directory?
# This follows symbolic links, so both islink() and isdir() can be true
# for the same path.
def isdir(path):
try:
st = os.stat(path)
except os.error:
return 0
return stat.S_ISDIR(st[stat.ST_MODE])
# Is a path a regular file?
# This follows symbolic links, so both islink() and isdir() can be true
# for the same path.
def isfile(path):
try:
st = os.stat(path)
except os.error:
return 0
return stat.S_ISREG(st[stat.ST_MODE])
# Are two filenames really pointing to the same file?
def samefile(f1, f2):
s1 = os.stat(f1)
s2 = os.stat(f2)
return samestat(s1, s2)
# Are two open files really referencing the same file?
# (Not necessarily the same file descriptor!)
# XXX THIS IS BROKEN UNDER DOS! ST_INO seems to indicate number of reads?
def sameopenfile(fp1, fp2):
s1 = os.fstat(fp1.fileno())
s2 = os.fstat(fp2.fileno())
return samestat(s1, s2)
# Are two stat buffers (obtained from stat, fstat or lstat)
# describing the same file?
def samestat(s1, s2):
return s1[stat.ST_INO] == s2[stat.ST_INO] and \
s1[stat.ST_DEV] == s2[stat.ST_DEV]
# Is a path a mount point?
# XXX This degenerates in: 'is this the root?' on DOS
def ismount(path):
return isabs(splitdrive(path)[1])
# Directory tree walk.
# For each directory under top (including top itself, but excluding
# '.' and '..'), func(arg, dirname, filenames) is called, where
# dirname is the name of the directory and filenames is the list
# files files (and subdirectories etc.) in the directory.
# The func may modify the filenames list, to implement a filter,
# or to impose a different order of visiting.
def walk(top, func, arg):
try:
names = os.listdir(top)
except os.error:
return
func(arg, top, names)
exceptions = ('.', '..')
for name in names:
if name not in exceptions:
name = join(top, name)
if isdir(name):
walk(name, func, arg)
# Expand paths beginning with '~' or '~user'.
# '~' means $HOME; '~user' means that user's home directory.
# If the path doesn't begin with '~', or if the user or $HOME is unknown,
# the path is returned unchanged (leaving error reporting to whatever
# function is called with the expanded path as argument).
# See also module 'glob' for expansion of *, ? and [...] in pathnames.
# (A function should also be defined to do full *sh-style environment
# variable expansion.)
def expanduser(path):
if path[:1] <> '~':
return path
i, n = 1, len(path)
while i < n and path[i] not in '/\\':
i = i+1
if i == 1:
if not os.environ.has_key('HOME'):
return path
userhome = os.environ['HOME']
else:
return path
return userhome + path[i:]
# Expand paths containing shell variable substitutions.
# The following rules apply:
# - no expansion within single quotes
# - no escape character, except for '$$' which is translated into '$'
# - ${varname} is accepted.
# - varnames can be made out of letters, digits and the character '_'
# XXX With COMMAND.COM you can use any characters in a variable name,
# XXX except '^|<>='.
varchars = string.letters + string.digits + '_-'
def expandvars(path):
if '$' not in path:
return path
res = ''
index = 0
pathlen = len(path)
while index < pathlen:
c = path[index]
if c == '\'': # no expansion within single quotes
path = path[index + 1:]
pathlen = len(path)
try:
index = string.index(path, '\'')
res = res + '\'' + path[:index + 1]
except string.index_error:
res = res + path
index = pathlen -1
elif c == '$': # variable or '$$'
if path[index + 1:index + 2] == '$':
res = res + c
index = index + 1
elif path[index + 1:index + 2] == '{':
path = path[index+2:]
pathlen = len(path)
try:
index = string.index(path, '}')
var = path[:index]
if os.environ.has_key(var):
res = res + os.environ[var]
except string.index_error:
res = res + path
index = pathlen - 1
else:
var = ''
index = index + 1
c = path[index:index + 1]
while c != '' and c in varchars:
var = var + c
index = index + 1
c = path[index:index + 1]
if os.environ.has_key(var):
res = res + os.environ[var]
if c != '':
res = res + c
else:
res = res + c
index = index + 1
return res
# Normalize a path, e.g. A//B, A/./B and A/foo/../B all become A/B.
# Also, components of the path are silently truncated to 8+3 notation.
def normpath(path):
path = normcase(path)
prefix, path = splitdrive(path)
while path[:1] == os.sep:
prefix = prefix + os.sep
path = path[1:]
comps = string.splitfields(path, os.sep)
i = 0
while i < len(comps):
if comps[i] == '.':
del comps[i]
elif comps[i] == '..' and i > 0 and \
comps[i-1] not in ('', '..'):
del comps[i-1:i+1]
i = i-1
elif comps[i] == '' and i > 0 and comps[i-1] <> '':
del comps[i]
elif '.' in comps[i]:
comp = string.splitfields(comps[i], '.')
comps[i] = comp[0][:8] + '.' + comp[1][:3]
i = i+1
elif len(comps[i]) > 8:
comps[i] = comps[i][:8]
i = i+1
else:
i = i+1
# If the path is now empty, substitute '.'
if not prefix and not comps:
comps.append('.')
return prefix + string.joinfields(comps, os.sep)
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