def _add_token(self, token: Token) -> None:
if token.text in operations:
token = Node(token, NODE_OP)
elif token.text in unary_op:
token = Node(token, NODE_UNARY)
elif token.text in ['x', 'X']:
token = Node(token, NODE_VAR)
elif token.isdigit():
token = Node(token, NODE_NUM)
else:
raise ValidateError("Undefined token", token)
self._stack.push(token)
def select_action(self, val: Token) \
-> None:
if val.position >= self._position:
self._position = val.position
if val.text in OPS:
self._handle_operator(val)
elif val.text.isspace():
pass
elif val.isdigit():
if self._previous_token == ')':
self.select_action(Token('*', self._position))
self._res.append(val)
self._possible_unary = False
elif val.text in ['x', 'X']:
if self.__previous_is_digit() or \
self._previous_token in ['x', 'X'] or \
self._previous_token == ')':
self.select_action(Token('*', self._position))
self._res.append(val)
self._possible_unary = False
elif val.text == '(':
self.__increase_stack(val)
self._possible_unary = True
elif val.text == ')':
if self._previous_token in OPS:
raise ValidateError(
"Перед закрывающими скобками стоит "
"знак операции", val)
self._handle_parentheses(val)
self._possible_unary = False
elif val.text == '=':
if self._moved_left:
raise ValidateError("Not more than one quality sign allowed",
val)
self._handle_eos()
self._move_to_left()
self._possible_unary = True
else:
raise ValidateError(f"Unknown token '{val.text}'", val)