Source Code for Module osh.command.reverse

 1  # osh 
 2  # Copyright (C) Jack Orenstein <jao@geophile.com> 
 3  # 
 4  # This program is free software; you can redistribute it and/or modify 
 5  # it under the terms of the GNU General Public License as published by 
 6  # the Free Software Foundation; either version 2 of the License, or 
 7  # (at your option) any later version. 
 8  # 
 9  # This program is distributed in the hope that it will be useful, 
10  # but WITHOUT ANY WARRANTY; without even the implied warranty of 
11  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
12  # GNU General Public License for more details. 
13  # 
14  # You should have received a copy of the GNU General Public License 
15  # along with this program; if not, write to the Free Software 
16  # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 
17   
18  """C{reverse} 
19   
20  Input objects are sent to the output stream in the opposite order, (last-in first-out). 
21  """ 
22   
23  import osh.function 
24  import osh.core 
25   
26  # CLI 
27 -def _reverse(): 
28      return _Reverse() 
29   
30  # API 
31 -def reverse(): 
32      """Input objects are sent to the output stream in the opposite order, (last-in first-out). 
33      """ 
34      return _Reverse() 
35   
36 -class _Reverse(osh.core.Op): 
37   
38      _list = None 
39   
40   
41      # object interface 
42   
43 -    def __init__(self): 
44          osh.core.Op.__init__(self, '', (0, 0)) 
45   
46   
47      # BaseOp interface 
48       
49 -    def doc(self): 
50          return __doc__ 
51   
52 -    def setup(self): 
53          self._list = [] 
54       
55 -    def receive(self, object): 
56          self._list.append(object) 
57       
58 -    def receive_complete(self): 
59          self._list.reverse() 
60          for object in self._list: 
61              self.send(object) 
62          seld.send_complete() 
63