Repository navigation
Expand file tree
/
Copy pathinspection.py
More file actions
307 lines (256 loc) · 9.82 KB
/
Copy pathinspection.py
File metadata and controls
307 lines (256 loc) · 9.82 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
# encoding: utf-8
# The MIT License
#
# Copyright (c) 2009-2011 the bpython authors.
# Copyright (c) 2015 Sebastian Ramacher
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
import inspect
import io
import keyword
import pydoc
from collections import namedtuple
from six.moves import range
from pygments.token import Token
from bpython._py3compat import PythonLexer, py3
from bpython.lazyre import LazyReCompile
if not py3:
import types
_name = LazyReCompile(r'[a-zA-Z_]\w*$')
ArgSpec = namedtuple('ArgSpec', ['args', 'varargs', 'varkwargs', 'defaults',
'kwonly', 'kwonly_defaults', 'annotations'])
FuncProps = namedtuple('FuncProps', ['func', 'argspec', 'is_bound_method'])
class AttrCleaner(object):
"""A context manager that tries to make an object not exhibit side-effects
on attribute lookup."""
def __init__(self, obj):
self.obj = obj
def __enter__(self):
"""Try to make an object not exhibit side-effects on attribute
lookup."""
type_ = type(self.obj)
__getattribute__ = None
__getattr__ = None
# Dark magic:
# If __getattribute__ doesn't exist on the class and __getattr__ does
# then __getattr__ will be called when doing
# getattr(type_, '__getattribute__', None)
# so we need to first remove the __getattr__, then the
# __getattribute__, then look up the attributes and then restore the
# original methods. :-(
# The upshot being that introspecting on an object to display its
# attributes will avoid unwanted side-effects.
if py3 or type_ != types.InstanceType:
__getattr__ = getattr(type_, '__getattr__', None)
if __getattr__ is not None:
try:
setattr(type_, '__getattr__', (lambda *_, **__: None))
except TypeError:
__getattr__ = None
__getattribute__ = getattr(type_, '__getattribute__', None)
if __getattribute__ is not None:
try:
setattr(type_, '__getattribute__', object.__getattribute__)
except TypeError:
# XXX: This happens for e.g. built-in types
__getattribute__ = None
self.attribs = (__getattribute__, __getattr__)
# /Dark magic
def __exit__(self, exc_type, exc_val, exc_tb):
"""Restore an object's magic methods."""
type_ = type(self.obj)
__getattribute__, __getattr__ = self.attribs
# Dark magic:
if __getattribute__ is not None:
setattr(type_, '__getattribute__', __getattribute__)
if __getattr__ is not None:
setattr(type_, '__getattr__', __getattr__)
# /Dark magic
class _Repr(object):
"""
Helper for `fixlongargs()`: Returns the given value in `__repr__()`.
"""
def __init__(self, value):
self.value = value
def __repr__(self):
return self.value
__str__ = __repr__
def parsekeywordpairs(signature):
tokens = PythonLexer().get_tokens(signature)
preamble = True
stack = []
substack = []
parendepth = 0
for token, value in tokens:
if preamble:
if token is Token.Punctuation and value == u"(":
preamble = False
continue
if token is Token.Punctuation:
if value in [u'(', u'{', u'[']:
parendepth += 1
elif value in [u')', u'}', u']']:
parendepth -= 1
elif value == ':' and parendepth == -1:
# End of signature reached
break
if ((value == ',' and parendepth == 0) or
(value == ')' and parendepth == -1)):
stack.append(substack)
substack = []
continue
if value and (parendepth > 0 or value.strip()):
substack.append(value)
d = {}
for item in stack:
if len(item) >= 3:
d[item[0]] = ''.join(item[2:])
return d
def fixlongargs(f, argspec):
"""Functions taking default arguments that are references to other objects
whose str() is too big will cause breakage, so we swap out the object
itself with the name it was referenced with in the source by parsing the
source itself !"""
if argspec[3] is None:
# No keyword args, no need to do anything
return
values = list(argspec[3])
if not values:
return
keys = argspec[0][-len(values):]
try:
src = inspect.getsourcelines(f)
except (IOError, IndexError):
# IndexError is raised in inspect.findsource(), can happen in
# some situations. See issue #94.
return
signature = ''.join(src[0])
kwparsed = parsekeywordpairs(signature)
for i, (key, value) in enumerate(zip(keys, values)):
if len(repr(value)) != len(kwparsed[key]):
values[i] = _Repr(kwparsed[key])
argspec[3] = values
getpydocspec_re = LazyReCompile(r'([a-zA-Z_][a-zA-Z0-9_]*?)\((.*?)\)')
def getpydocspec(f, func):
try:
argspec = pydoc.getdoc(f)
except NameError:
return None
s = getpydocspec_re.search(argspec)
if s is None:
return None
if not hasattr(f, '__name__') or s.groups()[0] != f.__name__:
return None
args = list()
defaults = list()
varargs = varkwargs = None
kwonly_args = list()
kwonly_defaults = dict()
for arg in s.group(2).split(','):
arg = arg.strip()
if arg.startswith('**'):
varkwargs = arg[2:]
elif arg.startswith('*'):
varargs = arg[1:]
else:
arg, _, default = arg.partition('=')
if varargs is not None:
kwonly_args.append(arg)
if default:
kwonly_defaults[arg] = default
else:
args.append(arg)
if default:
defaults.append(default)
return ArgSpec(args, varargs, varkwargs, defaults, kwonly_args,
kwonly_defaults, None)
def getfuncprops(func, f):
# Check if it's a real bound method or if it's implicitly calling __init__
# (i.e. FooClass(...) and not FooClass.__init__(...) -- the former would
# not take 'self', the latter would:
try:
func_name = getattr(f, '__name__', None)
except:
# if calling foo.__name__ would result in an error
func_name = None
try:
is_bound_method = ((inspect.ismethod(f) and f.__self__ is not None)
or (func_name == '__init__' and not
func.endswith('.__init__'))
or (func_name == '__new__' and not
func.endswith('.__new__')))
except:
# if f is a method from a xmlrpclib.Server instance, func_name ==
# '__init__' throws xmlrpclib.Fault (see #202)
return None
try:
if py3:
argspec = inspect.getfullargspec(f)
else:
argspec = inspect.getargspec(f)
argspec = list(argspec)
fixlongargs(f, argspec)
if len(argspec) == 4:
argspec = argspec + [list(), dict(), None]
argspec = ArgSpec(*argspec)
fprops = FuncProps(func, argspec, is_bound_method)
except (TypeError, KeyError):
with AttrCleaner(f):
argspec = getpydocspec(f, func)
if argspec is None:
return None
if inspect.ismethoddescriptor(f):
argspec.args.insert(0, 'obj')
fprops = FuncProps(func, argspec, is_bound_method)
return fprops
def is_eval_safe_name(string):
if py3:
return all(part.isidentifier() and not keyword.iskeyword(part)
for part in string.split('.'))
else:
return all(_name.match(part) and not keyword.iskeyword(part)
for part in string.split('.'))
def is_callable(obj):
return callable(obj)
get_encoding_re = LazyReCompile(r'coding[:=]\s*([-\w.]+)')
def get_encoding(obj):
"""Try to obtain encoding information of the source of an object."""
for line in inspect.findsource(obj)[0][:2]:
m = get_encoding_re.search(line)
if m:
return m.group(1)
return 'ascii'
def get_encoding_file(fname):
"""Try to obtain encoding information from a Python source file."""
with io.open(fname, 'rt', encoding='ascii', errors='ignore') as f:
for unused in range(2):
line = f.readline()
match = get_encoding_re.search(line)
if match:
return match.group(1)
return 'ascii'
if py3:
def get_source_unicode(obj):
"""Returns a decoded source of object"""
return inspect.getsource(obj)
else:
def get_source_unicode(obj):
"""Returns a decoded source of object"""
return inspect.getsource(obj).decode(get_encoding(obj))