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1 # encoding: utf-8
1 # encoding: utf-8
2 """A fancy version of Python's builtin :func:`dir` function.
2 """A fancy version of Python's builtin :func:`dir` function.
3 """
3 """
4
4
5 #-----------------------------------------------------------------------------
5 #-----------------------------------------------------------------------------
6 # Copyright (C) 2008-2011 The IPython Development Team
6 # Copyright (C) 2008-2011 The IPython Development Team
7 #
7 #
8 # Distributed under the terms of the BSD License. The full license is in
8 # Distributed under the terms of the BSD License. The full license is in
9 # the file COPYING, distributed as part of this software.
9 # the file COPYING, distributed as part of this software.
10 #-----------------------------------------------------------------------------
10 #-----------------------------------------------------------------------------
11
11
12 #-----------------------------------------------------------------------------
12 #-----------------------------------------------------------------------------
13 # Imports
13 # Imports
14 #-----------------------------------------------------------------------------
14 #-----------------------------------------------------------------------------
15 from .py3compat import string_types
15 from .py3compat import string_types
16
16
17 #-----------------------------------------------------------------------------
17 #-----------------------------------------------------------------------------
18 # Code
18 # Code
19 #-----------------------------------------------------------------------------
19 #-----------------------------------------------------------------------------
20
20
21
21
22 def safe_hasattr(obj, attr):
22 def safe_hasattr(obj, attr):
23 """In recent versions of Python, hasattr() only catches AttributeError.
23 """In recent versions of Python, hasattr() only catches AttributeError.
24 This catches all errors.
24 This catches all errors.
25 """
25 """
26 try:
26 try:
27 getattr(obj, attr)
27 getattr(obj, attr)
28 return True
28 return True
29 except:
29 except:
30 return False
30 return False
31
31
32
32
33 def get_class_members(cls):
33 def get_class_members(cls):
34 ret = dir(cls)
34 ret = dir(cls)
35 if safe_hasattr(cls, '__bases__'):
35 if safe_hasattr(cls, '__bases__'):
36 try:
36 try:
37 bases = cls.__bases__
37 bases = cls.__bases__
38 except AttributeError:
38 except AttributeError:
39 # `obj` lied to hasattr (e.g. Pyro), ignore
39 # `obj` lied to hasattr (e.g. Pyro), ignore
40 pass
40 pass
41 else:
41 else:
42 for base in bases:
42 for base in bases:
43 ret.extend(get_class_members(base))
43 ret.extend(get_class_members(base))
44 return ret
44 return ret
45
45
46
46
47 def dir2(obj):
47 def dir2(obj):
48 """dir2(obj) -> list of strings
48 """dir2(obj) -> list of strings
49
49
50 Extended version of the Python builtin dir(), which does a few extra
50 Extended version of the Python builtin dir(), which does a few extra
51 checks, and supports common objects with unusual internals that confuse
51 checks, and supports common objects with unusual internals that confuse
52 dir(), such as Traits and PyCrust.
52 dir(), such as Traits and PyCrust.
53
53
54 This version is guaranteed to return only a list of true strings, whereas
54 This version is guaranteed to return only a list of true strings, whereas
55 dir() returns anything that objects inject into themselves, even if they
55 dir() returns anything that objects inject into themselves, even if they
56 are later not really valid for attribute access (many extension libraries
56 are later not really valid for attribute access (many extension libraries
57 have such bugs).
57 have such bugs).
58 """
58 """
59
59
60 # Start building the attribute list via dir(), and then complete it
60 # Start building the attribute list via dir(), and then complete it
61 # with a few extra special-purpose calls.
61 # with a few extra special-purpose calls.
62
62
63 try:
63 try:
64 words = set(dir(obj))
64 words = set(dir(obj))
65 except:
65 except Exception:
66 # TypeError: dir(obj) does not return a list
66 # TypeError: dir(obj) does not return a list
67 words = set()
67 words = set()
68
68
69 if safe_hasattr(obj, '__class__'):
69 if safe_hasattr(obj, '__class__'):
70 #words.add('__class__')
70 #words.add('__class__')
71 words |= set(get_class_members(obj.__class__))
71 words |= set(get_class_members(obj.__class__))
72
72
73
73
74 # for objects with Enthought's traits, add trait_names() list
74 # for objects with Enthought's traits, add trait_names() list
75 # for PyCrust-style, add _getAttributeNames() magic method list
75 # for PyCrust-style, add _getAttributeNames() magic method list
76 for attr in ('trait_names', '_getAttributeNames'):
76 for attr in ('trait_names', '_getAttributeNames'):
77 try:
77 try:
78 func = getattr(obj, attr)
78 func = getattr(obj, attr)
79 if callable(func):
79 if callable(func):
80 words |= set(func())
80 words |= set(func())
81 except:
81 except:
82 # TypeError: obj is class not instance
82 # TypeError: obj is class not instance
83 pass
83 pass
84
84
85 # filter out non-string attributes which may be stuffed by dir() calls
85 # filter out non-string attributes which may be stuffed by dir() calls
86 # and poor coding in third-party modules
86 # and poor coding in third-party modules
87
87
88 words = [w for w in words if isinstance(w, string_types)]
88 words = [w for w in words if isinstance(w, string_types)]
89 return sorted(words)
89 return sorted(words)
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