def _find_groups(self) -> Tuple[Optional[str], Optional[int]]:
"""Returns a tuple (reverse string, group count) for a url.
For example: Given the url pattern /([0-9]{4})/([a-z-]+)/, this method
would return ('/%s/%s/', 2).
"""
pattern = self.regex.pattern
if pattern.startswith("^"):
pattern = pattern[1:]
if pattern.endswith("$"):
pattern = pattern[:-1]
if self.regex.groups != pattern.count("("):
# The pattern is too complicated for our simplistic matching,
# so we can't support reversing it.
return None, None
pieces = []
for fragment in pattern.split("("):
if ")" in fragment:
paren_loc = fragment.index(")")
if paren_loc >= 0:
pieces.append("%s" + fragment[paren_loc + 1:])
else:
try:
unescaped_fragment = re_unescape(fragment)
except ValueError:
# If we can't unescape part of it, we can't
# reverse this url.
return (None, None)
pieces.append(unescaped_fragment)
return "".join(pieces), self.regex.groups
def _find_groups(url):
"""Returns a tuple (reverse string, group count) for a url.
For example: Given the url pattern /([0-9]{4})/([a-z-]+)/, this method
would return ('/%s/%s/', 2).
"""
regex = re.compile(url)
pattern = url
if pattern.startswith('^'):
pattern = pattern[1:]
if pattern.endswith('$'):
pattern = pattern[:-1]
if regex.groups != pattern.count('('):
# The pattern is too complicated for our simplistic matching,
# so we can't support reversing it.
return None, None
pieces = []
for fragment in pattern.split('('):
if ')' in fragment:
paren_loc = fragment.index(')')
if paren_loc >= 0:
pieces.append('%s' + fragment[paren_loc + 1:])
else:
try:
unescaped_fragment = re_unescape(fragment)
except ValueError:
# If we can't unescape part of it, we can't
# reverse this url.
return (None, None)
pieces.append(unescaped_fragment)
return ''.join(pieces), regex.groups
def _find_groups(self) -> Tuple[Optional[str], Optional[int]]:
"""Returns a tuple (reverse string, group count) for a url.
For example: Given the url pattern /([0-9]{4})/([a-z-]+)/, this method
would return ('/%s/%s/', 2).
"""
pattern = self.regex.pattern
if pattern.startswith("^"):
pattern = pattern[1:]
if pattern.endswith("$"):
pattern = pattern[:-1]
if self.regex.groups != pattern.count("("):
# The pattern is too complicated for our simplistic matching,
# so we can't support reversing it.
return None, None
pieces = []
for fragment in pattern.split("("):
if ")" in fragment:
paren_loc = fragment.index(")")
if paren_loc >= 0:
pieces.append("%s" + fragment[paren_loc + 1 :])
else:
try:
unescaped_fragment = re_unescape(fragment)
except ValueError:
# If we can't unescape part of it, we can't
# reverse this url.
return (None, None)
pieces.append(unescaped_fragment)
return "".join(pieces), self.regex.groups
def test_re_unescape(self):
test_strings = (
'/favicon.ico',
'index.html',
'Hello, World!',
'!$@#%;',
)
for string in test_strings:
self.assertEqual(string, re_unescape(re.escape(string)))
def test_re_unescape(self):
test_strings = (
'/favicon.ico',
'index.html',
'Hello, World!',
'!$@#%;',
)
for string in test_strings:
self.assertEqual(string, re_unescape(re.escape(string)))
def test_re_unescape_raises_error_on_invalid_input(self):
with self.assertRaises(ValueError):
re_unescape('\\d')
with self.assertRaises(ValueError):
re_unescape('\\b')
with self.assertRaises(ValueError):
re_unescape('\\Z')
def test_re_unescape_raises_error_on_invalid_input(self):
with self.assertRaises(ValueError):
re_unescape("\\d")
with self.assertRaises(ValueError):
re_unescape("\\b")
with self.assertRaises(ValueError):
re_unescape("\\Z")
def test_re_unescape(self):
test_strings = ("/favicon.ico", "statistics.html", "Hello, World!",
"!$@#%;")
for string in test_strings:
self.assertEqual(string, re_unescape(re.escape(string)))
def test_re_unescape(self):
test_strings = ("/favicon.ico", "index.html", "Hello, World!", "!$@#%;")
for string in test_strings:
self.assertEqual(string, re_unescape(re.escape(string)))