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comparison 2.00/compat.py @ 34:8fec38b0dd6e

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A os.path.relpath implementation for Python 2.5
author Oleg Oshmyan <chortos@inbox.lv>
date Tue, 30 Nov 2010 00:18:17 +0000
parents fe1463e7e24d
children 23aa8da5be5f
comparison
equal deleted inserted replaced
33:f90bd2d1a12b 34:8fec38b0dd6e
62 if file is None: file = sys.stdout 62 if file is None: file = sys.stdout
63 if not isinstance(sep, basestring): raise saytypeerror(sep, 'sep') 63 if not isinstance(sep, basestring): raise saytypeerror(sep, 'sep')
64 if not isinstance(end, basestring): raise saytypeerror(end, 'end') 64 if not isinstance(end, basestring): raise saytypeerror(end, 'end')
65 file.write(sep.join(map(str, values)) + end) 65 file.write(sep.join(map(str, values)) + end)
66 66
67 try:
68 from os.path import relpath
69 except ImportError:
70 # Python 2.5
71 import os.path as _path
72
73 # Adapted from Python 2.7.1
74
75 if hasattr(_path, 'splitunc'):
76 def _abspath_split(path):
77 abs = _path.abspath(_path.normpath(path))
78 prefix, rest = _path.splitunc(abs)
79 is_unc = bool(prefix)
80 if not is_unc:
81 prefix, rest = _path.splitdrive(abs)
82 return is_unc, prefix, [x for x in rest.split(_path.sep) if x]
83 else:
84 def _abspath_split(path):
85 prefix, rest = _path.splitdrive(_path.abspath(_path.normpath(path)))
86 return False, prefix, [x for x in rest.split(_path.sep) if x]
87
88 def relpath(path, start=_path.curdir):
89 """Return a relative version of a path"""
90
91 if not path:
92 raise ValueError("no path specified")
93
94 start_is_unc, start_prefix, start_list = _abspath_split(start)
95 path_is_unc, path_prefix, path_list = _abspath_split(path)
96
97 if path_is_unc ^ start_is_unc:
98 raise ValueError("Cannot mix UNC and non-UNC paths (%s and %s)"
99 % (path, start))
100 if path_prefix.lower() != start_prefix.lower():
101 if path_is_unc:
102 raise ValueError("path is on UNC root %s, start on UNC root %s"
103 % (path_prefix, start_prefix))
104 else:
105 raise ValueError("path is on drive %s, start on drive %s"
106 % (path_prefix, start_prefix))
107 # Work out how much of the filepath is shared by start and path.
108 i = 0
109 for e1, e2 in zip(start_list, path_list):
110 if e1.lower() != e2.lower():
111 break
112 i += 1
113
114 rel_list = [_path.pardir] * (len(start_list)-i) + path_list[i:]
115 if not rel_list:
116 return _path.curdir
117 return _path.join(*rel_list)
118
119 _path.relpath = relpath
120
67 def import_urllib(): 121 def import_urllib():
68 try: 122 try:
69 # Python 3 123 # Python 3
70 import urllib.request 124 import urllib.request
71 return urllib.request, lambda url: urllib.request.urlopen(url).read().decode() 125 return urllib.request, lambda url: urllib.request.urlopen(url).read().decode()