Mercurial > repos > shellac > sam_consensus_v3

comparison env/lib/python3.9/site-packages/rdflib/compat.py @ 0:4f3585e2f14b draft default tip

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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000
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-1:000000000000 0:4f3585e2f14b
1 """
2 Utility functions and objects to ease Python 2/3 compatibility,
3 and different versions of support libraries.
4 """
5 from __future__ import absolute_import
6 from __future__ import division
7 from __future__ import print_function
8
9 import re
10 import codecs
11 import warnings
12
13 import six
14
15
16 # clean ElementTree import
17 try:
18 from lxml import etree
19 except ImportError:
20 try:
21 # Python 2.5
22 import xml.etree.cElementTree as etree
23 except ImportError:
24 try:
25 # Python 2.5
26 import xml.etree.ElementTree as etree
27 except ImportError:
28 try:
29 # normal cElementTree install
30 import cElementTree as etree
31 except ImportError:
32 try:
33 # normal ElementTree install
34 import elementtree.ElementTree as etree
35 except ImportError:
36 raise Exception(
37 "Failed to import ElementTree from any known place")
38
39 try:
40 etree_register_namespace = etree.register_namespace
41 except AttributeError:
42
43 import xml.etree.ElementTree as etreenative
44
45 def etree_register_namespace(prefix, uri):
46 etreenative._namespace_map[uri] = prefix
47
48
49 def cast_bytes(s, enc='utf-8'):
50 if isinstance(s, six.text_type):
51 return s.encode(enc)
52 return s
53
54
55 if six.PY3:
56 # Python 3:
57 # ---------
58
59 def ascii(stream):
60 return codecs.getreader('ascii')(stream)
61
62 def bopen(*args, **kwargs):
63 return open(*args, mode='rb', **kwargs)
64
65 long_type = int
66
67 def sign(n):
68 if n < 0:
69 return -1
70 if n > 0:
71 return 1
72 return 0
73
74 else:
75 # Python 2
76 # --------
77
78 def ascii(stream):
79 return stream
80
81 bopen = open
82
83 long_type = long
84
85 def sign(n):
86 return cmp(n, 0)
87
88 r_unicodeEscape = re.compile(r'(\\u[0-9A-Fa-f]{4}|\\U[0-9A-Fa-f]{8})')
89
90
91 def _unicodeExpand(s):
92 return r_unicodeEscape.sub(lambda m: six.unichr(int(m.group(0)[2:], 16)), s)
93
94
95 narrow_build = False
96 try:
97 six.unichr(0x10FFFF)
98 except ValueError:
99 narrow_build = True
100
101 if narrow_build:
102 def _unicodeExpand(s):
103 try:
104 return r_unicodeEscape.sub(
105 lambda m: six.unichr(int(m.group(0)[2:], 16)), s)
106 except ValueError:
107 warnings.warn(
108 'Encountered a unicode char > 0xFFFF in a narrow python build. '
109 'Trying to degrade gracefully, but this can cause problems '
110 'later when working with the string:\n%s' % s)
111 return r_unicodeEscape.sub(
112 lambda m: codecs.decode(m.group(0), 'unicode_escape'), s)
113
114
115 def decodeStringEscape(s):
116 """
117 s is byte-string - replace \ escapes in string
118 """
119
120 if not six.PY3:
121 s = s.decode('string-escape')
122 else:
123 s = s.replace('\\t', '\t')
124 s = s.replace('\\n', '\n')
125 s = s.replace('\\r', '\r')
126 s = s.replace('\\b', '\b')
127 s = s.replace('\\f', '\f')
128 s = s.replace('\\"', '"')
129 s = s.replace("\\'", "'")
130 s = s.replace('\\\\', '\\')
131
132 return s
133 # return _unicodeExpand(s) # hmm - string escape doesn't do unicode escaping
134
135
136 def decodeUnicodeEscape(s):
137 """
138 s is a unicode string
139 replace ``\\n`` and ``\\u00AC`` unicode escapes
140 """
141 if not six.PY3:
142 s = s.encode('utf-8').decode('string-escape')
143 s = _unicodeExpand(s)
144 else:
145 s = s.replace('\\t', '\t')
146 s = s.replace('\\n', '\n')
147 s = s.replace('\\r', '\r')
148 s = s.replace('\\b', '\b')
149 s = s.replace('\\f', '\f')
150 s = s.replace('\\"', '"')
151 s = s.replace("\\'", "'")
152 s = s.replace('\\\\', '\\')
153
154 s = _unicodeExpand(s) # hmm - string escape doesn't do unicode escaping
155
156 return s
157
158
159 # Migration to abc in Python 3.8
160 try:
161 from collections.abc import Mapping, MutableMapping
162 except:
163 from collections import Mapping, MutableMapping