Flow\Parser::parseNotExpression PHP Method

    protected function parseNotExpression()
    {
        $line = $this->stream->getCurrentToken()->getLine();
        if ($this->stream->consume(Token::OPERATOR, 'not')) {
            $node = $this->parseNotExpression();
            return new Expression\NotExpression($node, $line);
        }
        return $this->parseInclusionExpression();
    }