paul@6 | 1 | #!/usr/bin/env python |
paul@6 | 2 | |
paul@6 | 3 | """ |
paul@6 | 4 | Identity-related functions. |
paul@6 | 5 | |
paul@222 | 6 | Copyright (C) 2015, 2016 Paul Boddie <paul@boddie.org.uk> |
paul@6 | 7 | |
paul@6 | 8 | This program is free software; you can redistribute it and/or modify it under |
paul@6 | 9 | the terms of the GNU General Public License as published by the Free Software |
paul@6 | 10 | Foundation; either version 3 of the License, or (at your option) any later |
paul@6 | 11 | version. |
paul@6 | 12 | |
paul@6 | 13 | This program is distributed in the hope that it will be useful, but WITHOUT |
paul@6 | 14 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
paul@6 | 15 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for more |
paul@6 | 16 | details. |
paul@6 | 17 | |
paul@6 | 18 | You should have received a copy of the GNU General Public License along with |
paul@6 | 19 | this program. If not, see <http://www.gnu.org/licenses/>. |
paul@6 | 20 | """ |
paul@6 | 21 | |
paul@356 | 22 | from native import isinstance as _isinstance, issubclass as _issubclass |
paul@231 | 23 | |
paul@231 | 24 | def callable(obj): |
paul@231 | 25 | |
paul@231 | 26 | "Return whether 'obj' is callable." |
paul@231 | 27 | |
paul@231 | 28 | # NOTE: Classes and functions are callable, modules are not callable, |
paul@231 | 29 | # NOTE: only instances with __call__ methods should be callable. |
paul@231 | 30 | |
paul@231 | 31 | pass |
paul@231 | 32 | |
paul@231 | 33 | def id(obj): |
paul@231 | 34 | |
paul@231 | 35 | # NOTE: This should show an object's address, but it is currently |
paul@231 | 36 | # NOTE: unsupported. |
paul@231 | 37 | |
paul@231 | 38 | pass |
paul@231 | 39 | |
paul@231 | 40 | def isclass(obj): |
paul@231 | 41 | |
paul@231 | 42 | "Return whether 'obj' is a class." |
paul@231 | 43 | |
paul@231 | 44 | return obj.__class__ is type |
paul@6 | 45 | |
paul@6 | 46 | def isinstance(obj, cls_or_tuple): |
paul@6 | 47 | |
paul@6 | 48 | """ |
paul@6 | 49 | Return whether 'obj' is an instance of 'cls_or_tuple', where the latter is |
paul@231 | 50 | either a class or a sequence of classes. |
paul@6 | 51 | """ |
paul@6 | 52 | |
paul@356 | 53 | if _isinstance(cls_or_tuple, tuple): |
paul@6 | 54 | for cls in cls_or_tuple: |
paul@356 | 55 | if obj.__class__ is cls or isclass(cls) and _isinstance(obj, cls): |
paul@6 | 56 | return True |
paul@6 | 57 | return False |
paul@6 | 58 | else: |
paul@356 | 59 | return obj.__class__ is cls_or_tuple or isclass(cls_or_tuple) and _isinstance(obj, cls_or_tuple) |
paul@231 | 60 | |
paul@231 | 61 | def issubclass(obj, cls_or_tuple): |
paul@231 | 62 | |
paul@231 | 63 | """ |
paul@231 | 64 | Return whether 'obj' is a class that is a subclass of 'cls_or_tuple', where |
paul@231 | 65 | the latter is either a class or a sequence of classes. If 'obj' is the same |
paul@231 | 66 | as the given class or classes, True is also returned. |
paul@231 | 67 | """ |
paul@6 | 68 | |
paul@231 | 69 | if not isclass(obj): |
paul@231 | 70 | return False |
paul@356 | 71 | elif _isinstance(cls_or_tuple, tuple): |
paul@231 | 72 | for cls in cls_or_tuple: |
paul@356 | 73 | if obj is cls or isclass(cls) and _issubclass(obj, cls): |
paul@231 | 74 | return True |
paul@231 | 75 | return False |
paul@231 | 76 | else: |
paul@356 | 77 | return obj is cls_or_tuple or isclass(cls_or_tuple) and _issubclass(obj, cls_or_tuple) |
paul@6 | 78 | |
paul@222 | 79 | def repr(obj): |
paul@222 | 80 | |
paul@222 | 81 | "Return a program representation for 'obj'." |
paul@222 | 82 | |
paul@248 | 83 | # Class attributes of instances provide __repr__. |
paul@248 | 84 | |
paul@274 | 85 | return obj.__repr__() |
paul@6 | 86 | |
paul@6 | 87 | # vim: tabstop=4 expandtab shiftwidth=4 |