wheezy.routing / src / wheezy / routing /

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""" ``plain`` module.

import re

RE_CHOICE_ROUTE = re.compile(

def try_build_choice_route(pattern, finishing=True, kwargs=None, name=None):
    """ If the choince route regular expression match the pattern
        than create a ChoiceRoute instance.
    if isinstance(pattern, ChoiceRoute):
        return pattern
    m = RE_CHOICE_ROUTE.match(pattern)
    if m:
        return ChoiceRoute(pattern, finishing, kwargs, name)
    return None

class ChoiceRoute(object):
    """ Route based on choice match, e.g. {locale:(en|ru)}.

    __slots__ = ('kwargs', 'name', 'exact_matches', 'patterns', 'path_format')

    def __init__(self, pattern, finishing=True, kwargs=None, name=None):
        kwargs = kwargs and kwargs.copy() or {}
        if name:
            kwargs['route_name'] = name
        self.kwargs = kwargs
        m = RE_CHOICE_ROUTE.match(pattern)
        prefix,, choice, suffix = m.groups()
        choices = choice.split('|')
        self.exact_matches = [(prefix + c + suffix,
                               dict(kwargs, **{ c}))
                              for c in choices]
        self.patterns = [(pattern, (len(pattern), kwargs))
                         for pattern, kwargs in self.exact_matches]
        self.path_format = prefix + '%s' + suffix

    def match(self, path):
        """ If the ``path`` matches, return the end of
            substring matched and kwargs. Otherwise
            return ``(-1, None)``.
        for pattern, result in self.patterns:
            if path.startswith(pattern):
                return result
        return (-1, None)

    def path(self, values=None):
        """ Build the path for given route.
        if not values or not in values:
            values = self.kwargs
        return self.path_format % values[]