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Text File | 1994-08-23 | 2.7 KB | 127 lines | [TEXT/R*ch] |
- # module 'macpath' -- pathname (or -related) operations for the Macintosh
-
- import string
- import mac
- from stat import *
-
-
- # Normalize the case of a pathname. Dummy in Posix, but string.lower here.
-
- normcase = string.lower
-
-
- # Return true if a path is absolute.
- # On the Mac, relative paths begin with a colon,
- # but as a special case, paths with no colons at all are also relative.
- # Anything else is absolute (the string up to the first colon is the
- # volume name).
-
- def isabs(s):
- return ':' in s and s[0] <> ':'
-
-
- # Join two pathnames.
- # The result is equivalent to what the second pathname would refer to
- # if the first pathname were the current directory.
-
- def join(s, t):
- if (not s) or isabs(t): return t
- if t[:1] == ':': t = t[1:]
- if ':' not in s:
- s = ':' + s
- if s[-1:] <> ':':
- s = s + ':'
- return s + t
-
-
- # Split a pathname in two parts: the directory leading up to the final bit,
- # and the basename (the filename, without colons, in that directory).
- # The result (s, t) is such that join(s, t) yields the original argument.
-
- def split(s):
- if ':' not in s: return '', s
- colon = 0
- for i in range(len(s)):
- if s[i] == ':': colon = i+1
- return s[:colon-1], s[colon:]
-
-
- # Short interfaces to split()
-
- def dirname(s): return split(s)[0]
- def basename(s): return split(s)[1]
-
-
- # XXX This is undocumented and may go away!
- # Normalize a pathname: get rid of '::' sequences by backing up,
- # e.g., 'foo:bar::bletch' becomes 'foo:bletch'.
- # Raise the exception norm_error below if backing up is impossible,
- # e.g., for '::foo'.
-
- norm_error = 'macpath.norm_error: path cannot be normalized'
-
- def norm(s):
- import string
- if ':' not in s:
- return ':' + s
- f = string.splitfields(s, ':')
- pre = []
- post = []
- if not f[0]:
- pre = f[:1]
- f = f[1:]
- if not f[len(f)-1]:
- post = f[-1:]
- f = f[:-1]
- res = []
- for seg in f:
- if seg:
- res.append(seg)
- else:
- if not res: raise norm_error, 'path starts with ::'
- del res[len(res)-1]
- if not (pre or res):
- raise norm_error, 'path starts with volume::'
- if pre: res = pre + res
- if post: res = res + post
- s = res[0]
- for seg in res[1:]:
- s = s + ':' + seg
- return s
-
-
- # Return true if the pathname refers to an existing directory.
-
- def isdir(s):
- try:
- st = mac.stat(s)
- except mac.error:
- return 0
- return S_ISDIR(st[ST_MODE])
-
-
- # Return true if the pathname refers to an existing regular file.
-
- def isfile(s):
- try:
- st = mac.stat(s)
- except mac.error:
- return 0
- return S_ISREG(st[ST_MODE])
-
-
- # Return true if the pathname refers to an existing file or directory.
-
- def exists(s):
- try:
- st = mac.stat(s)
- except mac.error:
- return 0
- return 1
-
-
- # Normalize path, removing things like ...:A:..:... (yet to be written)
-
- def normpath(s):
- return s
-