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from __future__ import unicode_literals
from django.core.urlresolvers import resolve, get_script_prefix
from rest_framework.utils.formatting import get_view_name
def get_breadcrumbs(url):
"""Given a url returns a list of breadcrumbs, which are each a tuple of (name, url)."""
from rest_framework.views import APIView
def breadcrumbs_recursive(url, breadcrumbs_list, prefix, seen):
"""Add tuples of (name, url) to the breadcrumbs list, progressively chomping off parts of the url."""
try:
(view, unused_args, unused_kwargs) = resolve(url)
except Exception:
pass
else:
# Check if this is a REST framework view, and if so add it to the breadcrumbs
if issubclass(getattr(view, 'cls', None), APIView):
# Don't list the same view twice in a row.
# Probably an optional trailing slash.
if not seen or seen[-1] != view:
suffix = getattr(view, 'suffix', None)
breadcrumbs_list.insert(0, (get_view_name(view.cls, suffix), prefix + url))
seen.append(view)
if url == '':
# All done
return breadcrumbs_list
elif url.endswith('/'):
# Drop trailing slash off the end and continue to try to resolve more breadcrumbs
return breadcrumbs_recursive(url.rstrip('/'), breadcrumbs_list, prefix, seen)
# Drop trailing non-slash off the end and continue to try to resolve more breadcrumbs
return breadcrumbs_recursive(url[:url.rfind('/') + 1], breadcrumbs_list, prefix, seen)
prefix = get_script_prefix().rstrip('/')
url = url[len(prefix):]
return breadcrumbs_recursive(url, [], prefix, [])
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