Lichen

lib/operator/unary.py

932:c07b0dd14f85
11 months ago Paul Boddie Moved integer instantiation support to library functions.
     1 #!/usr/bin/env python     2      3 """     4 Operator support.     5      6 Copyright (C) 2010, 2013, 2015, 2016, 2017 Paul Boddie <paul@boddie.org.uk>     7      8 This program is free software; you can redistribute it and/or modify it under     9 the terms of the GNU General Public License as published by the Free Software    10 Foundation; either version 3 of the License, or (at your option) any later    11 version.    12     13 This program is distributed in the hope that it will be useful, but WITHOUT    14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS    15 FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more    16 details.    17     18 You should have received a copy of the GNU General Public License along with    19 this program.  If not, see <http://www.gnu.org/licenses/>.    20 """    21     22 from operator.core import unary_op    23 from native.int import int_neg, int_not, is_int    24     25 # These functions defer method lookup by wrapping the attribute access in    26 # lambda functions. Thus, the appropriate methods are defined locally, but no    27 # attempt to obtain them is made until the generic function is called.    28     29 # Unary operator functions.    30     31 def invert(a):    32     return unary_op(a, lambda a: a.__invert__)    33     34 def neg(a):    35     if is_int(a):    36         return int_neg(a)    37     return unary_op(a, lambda a: a.__neg__)    38     39 def not_(a):    40     if is_int(a):    41         return int_not(a)    42     return not a    43     44 def pos(a):    45     if is_int(a):    46         return a    47     return unary_op(a, lambda a: a.__pos__)    48     49 # vim: tabstop=4 expandtab shiftwidth=4