check.py
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00001 
00002 from collections import namedtuple
00003 
00004 
00005 class Fields(object):
00006     def __repr__(self):
00007         '''Get the namedtuple's repr, and replace the name with the current classname.
00008         This permits payloads to inherit from intermediary abstract payloads.'''
00009         parent_repr = super(Fields, self).__repr__()
00010         name, sep, fields = parent_repr.partition('_(')
00011         return "%s(%s" % (self.__class__.__name__, fields)
00012 
00013     def hex(self):
00014         return ' '.join(map(lambda c: "%02X" % c, self.data()))
00015 
00016     def check(self, fields):
00017         names = fields.split()
00018         return self.Check(self.__class__.__name__, names, 
00019                           map(lambda name: getattr(self, name), names))
00020 
00021     class Check(object):
00022         def __init__(self, subjname, names, values):
00023             self.names = names
00024             self.values = values
00025             self.subjname = subjname
00026 
00027         def _check(self, constraint, explanation):
00028             for name, value in zip(self.names, self.values):
00029                 if constraint(value):
00030                     e = "%s initialized with %s=%s: %s" % (self.subjname, name, repr(value), explanation)
00031                     raise ValueError(e)
00032 
00033         def range(self, lowerbound, upperbound):
00034             self._check(lambda x: x < lowerbound or x > upperbound,
00035                         "Outside of allowed range [%0.1f,%0.1f]" % 
00036                         (lowerbound, upperbound))
00037 
00038         def length(self, lowerbound, upperbound):
00039             self._check(lambda x: len(x) < lowerbound, 
00040                         "Length shorter than %d" % lowerbound)
00041             self._check(lambda x: len(x) > upperbound, 
00042                         "Length longer than %d" % upperbound)
00043 
00044         def each(self):
00045             subnames = []
00046             subvalues = []
00047             for name, value in zip(self.names, self.values):
00048                 # Confirm each of these is a list, then break it down and populate the sub-Check 
00049                 # object with the names and values of the individual items.
00050                 self._check(lambda x: not isinstance(x, list), "Not a list")
00051                 subnames += map(lambda index, subvalue: "%s[%s]" % (name, repr(index)), enumerate(value))
00052                 subvalues += value
00053             return self.__class__(self.subjname, subnames, subvalues)
00054 
00055         def ascii(self):
00056             self._check(lambda x: not all(ord(c) < 128 for c in x), 
00057                         "String contains non-ascii characters.")


clearpath_base
Author(s): Mike Purvis
autogenerated on Sat Dec 28 2013 16:50:47