'Parse subsequent argument lines.'

def _parse_arg_inside(self, line):

    argname = self._cur_arg_name
    if re.match('^[A-Z][a-z]+:$', line):
        if (not self.arg_descs[argname][(-1)].strip()):
            self.arg_descs[argname] = self.arg_descs[argname][:(-1)]
            return True
    elif (not line.strip()):
        self.arg_descs[argname].append('\n\n')
    elif line[4:].startswith('    '):
        self.arg_descs[argname].append((line.strip() + '\n'))
    else:
        self._process_arg(line)
    return False
