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Current File : /srv/modoboa/env/lib64/python3.5/site-packages/rest_framework_nested/routers.py
"""
Routers for nested resources.

Example:

    # urls.py

    from rest_framework_nested import routers

    router = routers.SimpleRouter()
    router.register(r'domains', DomainViewSet)

    domains_router = routers.NestedSimpleRouter(router, r'domains', lookup='domain')
    domains_router.register(r'nameservers', NameserverViewSet)

    url_patterns = patterns('',
        url(r'^', include(router.urls)),
            url(r'^', include(domains_router.urls)),
            )

        router = routers.DefaultRouter()
        router.register('users', UserViewSet, 'user')
        router.register('accounts', AccountViewSet, 'account')

        urlpatterns = router.urls
"""

from __future__ import unicode_literals
import sys
import re
from rest_framework.routers import SimpleRouter, DefaultRouter  # noqa: F401


if sys.version_info[0] < 3:
    IDENTIFIER_REGEX = re.compile(r"^[^\d\W]\w*$")
else:
    IDENTIFIER_REGEX = re.compile(r"^[^\d\W]\w*$", re.UNICODE)


class LookupMixin(object):
    """
    Deprecated.

    No method override is needed since Django Rest Framework 2.4.
    """


class NestedMixin(object):
    def __init__(self, parent_router, parent_prefix, *args, **kwargs):
        self.parent_router = parent_router
        self.parent_prefix = parent_prefix
        self.nest_count = getattr(parent_router, 'nest_count', 0) + 1
        self.nest_prefix = kwargs.pop('lookup', 'nested_%i' % self.nest_count) + '_'

        super(NestedMixin, self).__init__(*args, **kwargs)

        if 'trailing_slash' not in kwargs:
            # Inherit trailing_slash only when not specified explicitly.
            #
            # drf transposes the trailing_slash argument into the actual appended value
            # within the route urls. This means that, on the parent class, trailing_slash
            # is either '/' or '' for the expected kwarg values True or False, respectively.
            # If, however, the trailing_slash property has been further customized beyond
            # those two values (for example, to add an optional slash with '/?'), we won't
            # be able to set it through the kwargs.
            #
            # By copying the value of trailing_slash directly, we ensure that our inherited
            # behavior is ALWAYS consistent with the parent. If we didn't, we might create
            # a situation where the parent's trailing slash is truthy (but not '/') and
            # we set our trailing slash to just '/', leading to inconsistent behavior.
            self.trailing_slash = parent_router.trailing_slash

        parent_registry = [registered for registered
                           in self.parent_router.registry
                           if registered[0] == self.parent_prefix]
        try:
            parent_registry = parent_registry[0]
            parent_prefix, parent_viewset, parent_basename = parent_registry
        except:
            raise RuntimeError('parent registered resource not found')

        self.check_valid_name(self.nest_prefix)

        nested_routes = []
        parent_lookup_regex = parent_router.get_lookup_regex(parent_viewset, self.nest_prefix)

        self.parent_regex = '{parent_prefix}/{parent_lookup_regex}/'.format(
            parent_prefix=parent_prefix,
            parent_lookup_regex=parent_lookup_regex
        )
        # If there is no parent prefix, the first part of the url is probably
        #   controlled by the project's urls.py and the router is in an app,
        #   so a slash in the beginning will (A) cause Django to give warnings
        #   and (B) generate URLs that will require using `//`
        if not self.parent_prefix and self.parent_regex[0] == '/':
            self.parent_regex = self.parent_regex[1:]
        if hasattr(parent_router, 'parent_regex'):
            self.parent_regex = parent_router.parent_regex + self.parent_regex

        for route in self.routes:
            route_contents = route._asdict()

            # This will get passed through .format in a little bit, so we need
            # to escape it
            escaped_parent_regex = self.parent_regex.replace('{', '{{').replace('}', '}}')

            route_contents['url'] = route.url.replace('^', '^' + escaped_parent_regex)
            nested_routes.append(type(route)(**route_contents))

        self.routes = nested_routes

    def check_valid_name(self, value):
        if IDENTIFIER_REGEX.match(value) is None:
            raise ValueError("lookup argument '{}' needs to be valid python identifier".format(value))


class NestedSimpleRouter(NestedMixin, SimpleRouter):
    """ Create a NestedSimpleRouter nested within `parent_router`
    Args:

    parent_router: Parent router. Maybe be a SimpleRouter or another nested
        router.

    parent_prefix: The url prefix within parent_router under which the
        routes from this router should be nested.

    lookup:
        The regex variable that matches an instance of the parent-resource
        will be called '<lookup>_<parent-viewset.lookup_field>'
        In the example above, lookup=domain and the parent viewset looks up
        on 'pk' so the parent lookup regex will be 'domain_pk'.
        Default: 'nested_<n>' where <n> is 1+parent_router.nest_count

    """
    pass


class NestedDefaultRouter(NestedMixin, DefaultRouter):
    """ Create a NestedDefaultRouter nested within `parent_router`
    Args:

    parent_router: Parent router. Maybe be a DefaultRouter or another nested
        router.

    parent_prefix: The url prefix within parent_router under which the
        routes from this router should be nested.

    lookup:
        The regex variable that matches an instance of the parent-resource
        will be called '<lookup>_<parent-viewset.lookup_field>'
        In the example above, lookup=domain and the parent viewset looks up
        on 'pk' so the parent lookup regex will be 'domain_pk'.
        Default: 'nested_<n>' where <n> is 1+parent_router.nest_count

    """
    pass

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