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c084005d58
git-svn-id: http://code.djangoproject.com/svn/django/trunk@704 bcc190cf-cafb-0310-a4f2-bffc1f526a37
94 lines
3.5 KiB
Python
94 lines
3.5 KiB
Python
"""
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This module converts requested URLs to callback view functions.
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RegexURLResolver is the main class here. Its resolve() method takes a URL (as
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a string) and returns a tuple in this format:
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(view_function, dict_of_view_function_args)
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"""
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from django.core.exceptions import Http404, ViewDoesNotExist
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import re
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class Resolver404(Http404):
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pass
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def get_mod_func(callback):
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# Converts 'django.views.news.stories.story_detail' to
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# ['django.views.news.stories', 'story_detail']
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dot = callback.rindex('.')
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return callback[:dot], callback[dot+1:]
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class RegexURLPattern:
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def __init__(self, regex, callback, default_args=None):
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# regex is a string representing a regular expression.
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# callback is something like 'foo.views.news.stories.story_detail',
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# which represents the path to a module and a view function name.
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self.regex = re.compile(regex)
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self.callback = callback
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self.default_args = default_args or {}
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def resolve(self, path):
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match = self.regex.search(path)
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if match:
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args = dict(match.groupdict(), **self.default_args)
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try: # Lazily load self.func.
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return self.func, args
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except AttributeError:
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self.func = self.get_callback()
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return self.func, args
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def get_callback(self):
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mod_name, func_name = get_mod_func(self.callback)
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try:
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return getattr(__import__(mod_name, '', '', ['']), func_name)
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except ImportError, e:
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raise ViewDoesNotExist, "Could not import %s. Error was: %s" % (mod_name, str(e))
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except AttributeError, e:
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raise ViewDoesNotExist, "Tried %s in module %s. Error was: %s" % (func_name, mod_name, str(e))
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class RegexURLResolver(object):
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def __init__(self, regex, urlconf_name):
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# regex is a string representing a regular expression.
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# urlconf_name is a string representing the module containing urlconfs.
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self.regex = re.compile(regex)
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self.urlconf_name = urlconf_name
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def resolve(self, path):
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tried = []
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match = self.regex.search(path)
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if match:
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new_path = path[match.end():]
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for pattern in self.urlconf_module.urlpatterns:
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try:
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sub_match = pattern.resolve(new_path)
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except Resolver404, e:
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tried.extend([(pattern.regex.pattern + ' ' + t) for t in e.args[0]['tried']])
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else:
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if sub_match:
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return sub_match[0], dict(match.groupdict(), **sub_match[1])
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tried.append(pattern.regex.pattern)
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raise Resolver404, {'tried': tried, 'path': new_path}
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def _get_urlconf_module(self):
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try:
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return self._urlconf_module
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except AttributeError:
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self._urlconf_module = __import__(self.urlconf_name, '', '', [''])
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return self._urlconf_module
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urlconf_module = property(_get_urlconf_module)
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def _resolve_special(self, view_type):
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callback = getattr(self.urlconf_module, 'handler%s' % view_type)
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mod_name, func_name = get_mod_func(callback)
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try:
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return getattr(__import__(mod_name, '', '', ['']), func_name), {}
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except (ImportError, AttributeError), e:
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raise ViewDoesNotExist, "Tried %s. Error was: %s" % (callback, str(e))
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def resolve404(self):
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return self._resolve_special('404')
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def resolve500(self):
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return self._resolve_special('500')
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