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"""
This module converts requested URLs to callback view functions.
RegexURLResolver is the main class here. Its resolve() method takes a URL (as
a string) and returns a tuple in this format:
(view_function, dict_of_view_function_args)
"""
from django.core.exceptions import Http404, ViewDoesNotExist
import re
class Resolver404(Http404):
pass
def get_mod_func(callback):
# Converts 'django.views.news.stories.story_detail' to
# ['django.views.news.stories', 'story_detail']
dot = callback.rindex('.')
return callback[:dot], callback[dot+1:]
class RegexURLPattern:
def __init__(self, regex, callback, default_args=None):
# regex is a string representing a regular expression.
# callback is something like 'foo.views.news.stories.story_detail',
# which represents the path to a module and a view function name.
self.regex = re.compile(regex)
self.callback = callback
self.default_args = default_args or {}
def resolve(self, path):
match = self.regex.search(path)
if match:
args = dict(match.groupdict(), **self.default_args)
try: # Lazily load self.func.
return self.func, args
except AttributeError:
self.func = self.get_callback()
return self.func, args
def get_callback(self):
mod_name, func_name = get_mod_func(self.callback)
try:
return getattr(__import__(mod_name, '', '', ['']), func_name)
except ImportError, e:
raise ViewDoesNotExist, "Could not import %s. Error was: %s" % (mod_name, str(e))
except AttributeError, e:
raise ViewDoesNotExist, "Tried %s in module %s. Error was: %s" % (func_name, mod_name, str(e))
class RegexURLResolver(object):
def __init__(self, regex, urlconf_name):
# regex is a string representing a regular expression.
# urlconf_name is a string representing the module containing urlconfs.
self.regex = re.compile(regex)
self.urlconf_name = urlconf_name
def resolve(self, path):
tried = []
match = self.regex.search(path)
if match:
new_path = path[match.end():]
for pattern in self.urlconf_module.urlpatterns:
try:
sub_match = pattern.resolve(new_path)
except Resolver404, e:
tried.extend([(pattern.regex.pattern + ' ' + t) for t in e.args[0]['tried']])
else:
if sub_match:
return sub_match[0], dict(match.groupdict(), **sub_match[1])
tried.append(pattern.regex.pattern)
raise Resolver404, {'tried': tried, 'path': new_path}
def _get_urlconf_module(self):
try:
return self._urlconf_module
except AttributeError:
self._urlconf_module = __import__(self.urlconf_name, '', '', [''])
return self._urlconf_module
urlconf_module = property(_get_urlconf_module)
def _get_url_patterns(self):
return self.urlconf_module.urlpatterns
url_patterns = property(_get_url_patterns)
def _resolve_special(self, view_type):
callback = getattr(self.urlconf_module, 'handler%s' % view_type)
mod_name, func_name = get_mod_func(callback)
try:
return getattr(__import__(mod_name, '', '', ['']), func_name), {}
except (ImportError, AttributeError), e:
raise ViewDoesNotExist, "Tried %s. Error was: %s" % (callback, str(e))
def resolve404(self):
return self._resolve_special('404')
def resolve500(self):
return self._resolve_special('500')
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