| paul@6 | 1 | #!/usr/bin/env python |
| paul@6 | 2 | |
| paul@6 | 3 | """ |
| paul@6 | 4 | Boolean objects. |
| paul@6 | 5 | |
| paul@135 | 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@355 | 22 | class boolean: |
| paul@230 | 23 | |
| paul@230 | 24 | "The type of the True and False objects." |
| paul@230 | 25 | |
| paul@6 | 26 | def __bool__(self): |
| paul@230 | 27 | |
| paul@6 | 28 | "Identity operation." |
| paul@230 | 29 | |
| paul@6 | 30 | return self |
| paul@230 | 31 | |
| paul@6 | 32 | def __str__(self): |
| paul@230 | 33 | |
| paul@230 | 34 | "Return a string representation." |
| paul@230 | 35 | |
| paul@6 | 36 | return self is True and "True" or "False" |
| paul@6 | 37 | |
| paul@230 | 38 | __repr__ = __str__ |
| paul@230 | 39 | |
| paul@140 | 40 | False = boolean() |
| paul@140 | 41 | True = boolean() |
| paul@140 | 42 | |
| paul@140 | 43 | def bool(obj): |
| paul@230 | 44 | |
| paul@230 | 45 | "Evaluate 'obj' as a boolean value." |
| paul@230 | 46 | |
| paul@140 | 47 | return obj.__bool__() |
| paul@135 | 48 | |
| paul@6 | 49 | # vim: tabstop=4 expandtab shiftwidth=4 |
