1#
2# Copyright (c) 2005 Dima Dorfman.
3# All rights reserved.
4#
5# Redistribution and use in source and binary forms, with or without
6# modification, are permitted provided that the following conditions
7# are met:
8# 1. Redistributions of source code must retain the above copyright
9#    notice, this list of conditions and the following disclaimer.
10# 2. Redistributions in binary form must reproduce the above copyright
11#    notice, this list of conditions and the following disclaimer in the
12#    documentation and/or other materials provided with the distribution.
13#
14# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24# SUCH DAMAGE.
25#
26
27__all__ = ['compose', 'fastcut']
28__revision__ = '$Dima: pylib/functools/functools.py,v 1.2 2005/08/22 07:05:22 dima Exp $'
29
30
31def compose(*args):
32
33    if len(args) < 1:
34        raise TypeError, 'compose expects at least one argument'
35    fs = args[-2::-1]
36    g = args[-1]
37
38    def composecall(*args, **kw):
39        res = g(*args, **kw)
40        for f in fs:
41            res = f(res)
42        return res
43
44    return composecall
45
46
47def fastcut(*sargs, **skw):
48    try:
49        fun = sargs[0]
50    except IndexError:
51        raise TypeError, 'fastcut requires at least one argument'
52    sargs = sargs[1:]
53
54    def fastcutcall(*args, **kw):
55        rkw = skw.copy()
56        rkw.update(kw)
57        return fun(*(sargs + args), **rkw)
58
59    return fastcutcall
60
61
62for x in __all__:
63    globals()['py_%s' % x] = globals()[x]
64del x
65
66try:
67    import _functools
68except ImportError:
69    pass
70else:
71    for x in __all__:
72        globals()['c_%s' % x] = globals()[x] = getattr(_functools, x)
73    del x
74