✏️ Editing: resolver.py Read Only

from __future__ import absolute_import

import re

try:
    from django.urls import get_resolver
except ImportError:
    from django.core.urlresolvers import get_resolver

def get_regex(resolver_or_pattern):
    """Utility method for django's deprecated resolver.regex"""
    try:
        regex = resolver_or_pattern.regex
    except AttributeError:
        regex = resolver_or_pattern.pattern.regex
    return regex

class RouteResolver(object):
    _optional_group_matcher = re.compile(r'$\?\:([^$]+)\)')
    _named_group_matcher = re.compile(r'$\?P<(\w+)>[^$]+\)')
    _non_named_group_matcher = re.compile(r'$[^$]+\)')
    # [foo|bar|baz]
    _either_option_matcher = re.compile(r'\[([^\]]+)\|([^\]]+)\]')
    _camel_re = re.compile(r'([A-Z]+)([a-z])')

_cache = {}

def _simplify(self, pattern):
        r"""
        Clean up urlpattern regexes into something readable by humans:

From:
        > "^(?P<sport_slug>\w+)/athletes/(?P<athlete_slug>\w+)/$"

To:
        > "{sport_slug}/athletes/{athlete_slug}/"
        """
        # remove optional params
        # TODO(dcramer): it'd be nice to change these into [%s] but it currently
        # conflicts with the other rules because we're doing regexp matches
        # rather than parsing tokens
        result = self._optional_group_matcher.sub(lambda m: '%s' % m.group(1), pattern)

# handle named groups first
        result = self._named_group_matcher.sub(lambda m: '{%s}' % m.group(1), result)

# handle non-named groups
        result = self._non_named_group_matcher.sub('{var}', result)

# handle optional params
        result = self._either_option_matcher.sub(lambda m: m.group(1), result)

# clean up any outstanding regex-y characters.
        result = result.replace('^', '').replace('$', '') \
            .replace('?', '').replace('//', '/').replace('\\', '')

return result

def _resolve(self, resolver, path, parents=None):

match = get_regex(resolver).search(path)  # Django < 2.0

if not match:
            return

if parents is None:
            parents = [resolver]
        elif resolver not in parents:
            parents = parents + [resolver]

new_path = path[match.end():]
        for pattern in resolver.url_patterns:
            # this is an include()
            if not pattern.callback:
                match = self._resolve(pattern, new_path, parents)
                if match:
                    return match
                continue
            elif not get_regex(pattern).search(new_path):
                continue

try:
                return self._cache[pattern]
            except KeyError:
                pass

prefix = ''.join(self._simplify(get_regex(p).pattern) for p in parents)
            result = prefix + self._simplify(get_regex(pattern).pattern)
            if not result.startswith('/'):
                result = '/' + result
            self._cache[pattern] = result
            return result

def resolve(self, path, urlconf=None):
        resolver = get_resolver(urlconf)
        match = self._resolve(resolver, path)
        return match or path

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