Flow\Parser::parseIfModifier PHP Method

    protected function parseIfModifier($token, $node)
    {
        static $modifiers = array('if', 'unless');
        if ($this->stream->test($modifiers)) {
            $statement = $this->stream->expect($modifiers)->getValue();
            $test_expr = $this->parseExpression();
            if ($statement == 'if') {
                $node = new Node\IfNode(array(array($test_expr, $node)), null, $token->getLine());
            } elseif ($statement == 'unless') {
                $node = new Node\IfNode(array(array(new Expression\NotExpression($test_expr, $token->getLine()), $node)), null, $token->getLine());
            }
        }
        return $node;
    }