def match_link_title(cls, string, offset):
new_offset = shift_whitespace(string, offset)
if (new_offset == len(string) or '\n' in string[offset:new_offset]
and string[new_offset] == '['):
return offset, new_offset, ''
if string[new_offset] == '"':
closing = '"'
elif string[new_offset] == "'":
closing = "'"
elif string[new_offset] == '(':
closing = ')'
elif '\n' in string[offset:new_offset]:
return offset, offset, ''
else:
# XXX: Can this actually ever happen?
return None
offset = new_offset
escaped = False
for i, c in enumerate(string[offset + 1:], start=offset + 1):
if c == '\\' and not escaped:
escaped = True
elif c == closing and not escaped:
new_offset = shift_whitespace(string, i + 1)
if '\n' not in string[i + 1:new_offset]:
return None
return offset, new_offset, string[offset + 1:i]
elif escaped:
escaped = False
return None
def match_link_dest(cls, string, offset):
offset = shift_whitespace(string, offset + 1)
if offset == len(string):
return None
if string[offset] == '<':
escaped = False
for i, c in enumerate(string[offset + 1:], start=offset + 1):
if c == '\\' and not escaped:
escaped = True
elif c == ' ' or c == '\n' or (c == '<' and not escaped):
return None
elif c == '>' and not escaped:
return offset, i + 1, string[offset + 1:i]
elif escaped:
escaped = False
return None
else:
escaped = False
count = 0
for i, c in enumerate(string[offset:], start=offset):
if c == '\\' and not escaped:
escaped = True
elif c in whitespace:
break
elif not escaped:
if c == '(':
count += 1
elif c == ')':
count -= 1
elif is_control_char(c):
return None
elif escaped:
escaped = False
if count != 0:
return None
return offset, i, string[offset:i]
def test_shift_whitespace(self):
string = ' \n\t\rfoo'
self.assertEqual(shift_whitespace(string, 0), 4)
self.assertEqual(shift_whitespace('', 0), 0)