Flow\Parser::parseConditionalExpression PHP Method

    protected function parseConditionalExpression()
    {
        $line = $this->stream->getCurrentToken()->getLine();
        $expr1 = $this->parseXorExpression();
        while ($this->stream->consume(Token::OPERATOR, '?')) {
            $expr2 = $this->parseOrExpression();
            $this->stream->expect(Token::OPERATOR, ':');
            $expr3 = $this->parseConditionalExpression();
            $expr1 = new Expression\ConditionalExpression($expr1, $expr2, $expr3, $line);
            $line = $this->stream->getCurrentToken()->getLine();
        }
        return $expr1;
    }