class LocaleChooser (object):
"""
A tree of element stored hierarchically with respect to their locale.
The =getBestFit= method returns the best fit element with respect to the
default locale.
"""
def __init__ (self):
self.__ct = ChoiceTree ()
def __loc2tuple (self, loc):
if loc.lang is None:
return ()
elif loc.country is None:
return (loc.lang,)
else:
return (loc.lang, loc.country)
def add (self, elt):
seq = self.__loc2tuple (Locale.fromDomElement (elt))
self.__ct.set (seq, elt)
def getBestFit (self, loc = defaultLocale):
seq = self.__loc2tuple (loc)
tree = self.__ct
exactMatch = None
try:
subtree = tree.getSubtree (seq)
exactMatch = subtree.getAnyInstance ()
except KeyError:
pass
return (
exactMatch or
tree.getMostSpecificInstance (seq) or
tree.getAny ()
)
def __init__ (self):
self.__ct = ChoiceTree ()