def _replace_conditional(match, string):
"""Replaces a conditional match in a transformation."""
conditional_match = _CONDITIONAL.search(string)
while conditional_match:
start = conditional_match.start()
end = _find_closing_brace(string, start+4)
args = _split_conditional(string[start+4:end-1])
rv = ""
if match.group(int(conditional_match.group(1))):
rv = unescape(_replace_conditional(match, args[0]))
elif len(args) > 1:
rv = unescape(_replace_conditional(match, args[1]))
string = string[:start] + rv + string[end:]
conditional_match = _CONDITIONAL.search(string)
return string
def replace(self, match):
"""Replaces 'match' through the correct replacement string."""
transformed = self._expression
# Replace all $? with capture groups
transformed = _DOLLAR.subn(
lambda m: match.group(int(m.group(1))), transformed)[0]
# Replace Case switches
def _one_char_case_change(match):
"""Replaces one character case changes."""
if match.group(1)[0] == 'u':
return match.group(1)[-1].upper()
else:
return match.group(1)[-1].lower()
transformed = _ONE_CHAR_CASE_SWITCH.subn(
_one_char_case_change, transformed)[0]
def _multi_char_case_change(match):
"""Replaces multi character case changes."""
if match.group(1)[0] == 'U':
return match.group(1)[1:].upper()
else:
return match.group(1)[1:].lower()
transformed = _LONG_CASEFOLDINGS.subn(
_multi_char_case_change, transformed)[0]
transformed = _replace_conditional(match, transformed)
return unescape(fill_in_whitespace(transformed))
def _parse(self, stream, indent):
for _ in range(8): # ${VISUAL
next(stream)
if stream.peek() == ":":
next(stream)
self.alternative_text, char = _parse_till_unescaped_char(stream, '/}')
self.alternative_text = unescape(self.alternative_text)
if char == '/': # Transformation going on
try:
self.search = _parse_till_unescaped_char(stream, '/')[0]
self.replace = _parse_till_unescaped_char(stream, '/')[0]
self.options = _parse_till_closing_brace(stream)
except StopIteration:
raise RuntimeError(
"Invalid ${VISUAL} transformation! Forgot to escape a '/'?")
else:
self.search = None
self.replace = None
self.options = None