Implements base.Logic functions in home_settings, site_settings and work
This patch implements the base.Logic funtions needed for making
logic/key_name.py obsolete. This patch defines the needed functions
in home_settings, site_settings and work. All modules in logic/models
now have these functions defined.
logic/models/site_settings.py now inherits from
logic/models/home_settings.py because of their similar connection in
the corresponding models. Please note that the self._keyName for
these two modules still points to logic/key_name.py since entity_type
is still used in views/home.py.
A partial_path and link_name were added to HomeSettings as requested
by SRabbelier.
"""
Common checksum routines (used in multiple localflavor/ cases, for example).
"""
__all__ = ['luhn',]
LUHN_ODD_LOOKUP = (0, 2, 4, 6, 8, 1, 3, 5, 7, 9) # sum_of_digits(index * 2)
def luhn(candidate):
"""
Checks a candidate number for validity according to the Luhn
algorithm (used in validation of, for example, credit cards).
Both numeric and string candidates are accepted.
"""
if not isinstance(candidate, basestring):
candidate = str(candidate)
try:
evens = sum([int(c) for c in candidate[-1::-2]])
odds = sum([LUHN_ODD_LOOKUP[int(c)] for c in candidate[-2::-2]])
return ((evens + odds) % 10 == 0)
except ValueError: # Raised if an int conversion fails
return False