def _match_argument(self, action, arg_strings_pattern):
# - https://github.com/streamlink/streamlink/issues/971
# - https://bugs.python.org/issue9334
# match the pattern for this action to the arg strings
nargs_pattern = self._get_nargs_pattern(action)
match = argparse._re.match(nargs_pattern, arg_strings_pattern)
# if no match, see if we can emulate optparse and return the
# required number of arguments regardless of their values
if match is None:
nargs = action.nargs if action.nargs is not None else 1
if isinstance(nargs, numbers.Number) and len(arg_strings_pattern) >= nargs:
return nargs
# raise an exception if we weren't able to find a match
if match is None:
nargs_errors = {
None: argparse._('expected one argument'),
argparse.OPTIONAL: argparse._('expected at most one argument'),
argparse.ONE_OR_MORE: argparse._('expected at least one argument'),
}
default = argparse.ngettext('expected %s argument',
'expected %s arguments',
action.nargs) % action.nargs
msg = nargs_errors.get(action.nargs, default)
raise argparse.ArgumentError(action, msg)
# return the number of arguments matched
return len(match.group(1))
def update_event(self, inp=-1):
self.set_output_val(
0, argparse.ngettext(self.input(0), self.input(1), self.input(2)))
