Source Code for Module commons.exceps

 1  # -*- mode: python; tab-width: 4; indent-tabs-mode: nil; py-indent-offset: 4; -*- 
 2  # vim:ft=python:et:sw=4:ts=4 
 3   
 4  """ 
 5  Exceptions and exception handling. 
 6   
 7  @var orig_excepthook: The original excepthook (as of the time this 
 8  module is first loaded). This just serves as a backup if it needs to 
 9  be restored. 
10  """ 
11   
12  from decs import * 
13  import sys 
14   
15  orig_excepthook = sys.excepthook 
16   
17 -def handle_exceptions(): 
18      """ 
19      The default exception handler (prints a stack trace and the 
20      exception message), except it does not actually terminate the 
21      thread. 
22      """ 
23      orig_excepthook( *sys.exc_info() ) 
24   
25 -class FailedInvariant( Exception ): pass 
26   
27 -class InvariantChecker( GenericWrapper ): 
28      """ 
29      Wrap an object and all of its methods with per-access 
30      invariants-checking. 
31   
32      @todo: This code is incomplete and does not actually check 
33      invariants yet! 
34      """ 
35 -    def __init__( self, obj, ignore=() ): 
36          def check_invariants(): 
37              # TODO 
38              for invariant in self.invariants: 
39                  if not invariant(): 
40                      raise FailedInvariant() 
41          GenericWrapper.__init__(self, obj, None, check_invariants, ignore) 
42