Flow\Parser::parseAndExpression PHP Method

    protected function parseAndExpression()
    {
        $line = $this->stream->getCurrentToken()->getLine();
        $left = $this->parseNotExpression();
        while ($this->stream->consume(Token::OPERATOR, 'and')) {
            $right = $this->parseNotExpression();
            $left = new Expression\AndExpression($left, $right, $line);
            $line = $this->stream->getCurrentToken()->getLine();
        }
        return $left;
    }