parsePostfixExpression example

    protected function getPrimary()
    {
        $token = $this->stream->current;

        if ($token->test(Token::OPERATOR_TYPE) && isset($this->unaryOperators[$token->value])) {
            $operator = $this->unaryOperators[$token->value];
            $this->stream->next();
            $expr = $this->parseExpression($operator['precedence']);

            return $this->parsePostfixExpression(new Node\UnaryNode($token->value, $expr));
        }

        if ($token->test(Token::PUNCTUATION_TYPE, '(')) {
            $this->stream->next();
            $expr = $this->parseExpression();
            $this->stream->expect(Token::PUNCTUATION_TYPE, ')', 'An opened parenthesis is not properly closed');

            return $this->parsePostfixExpression($expr);
        }

        return $this->parsePrimaryExpression();
    }

/** * Parses a unary expression * * @return Node\Node|null */
    protected function parseUnaryExpression()
    {
        $operators = $this->unaryOperators;
        if ($this->features->asyncAwait && $this->context->allowAwait) {
            $operators[] = "await";
        }
        if ($expr = $this->parsePostfixExpression()) {
            return $expr;
        } elseif ($token = $this->scanner->consumeOneOf($operators)) {
            if ($argument = $this->parseUnaryExpression()) {

                $op = $token->value;

                //Deleting a variable without accessing its properties is a                 //syntax error in strict mode                 if ($op === "delete" &&
                    $this->scanner->getStrictMode() &&
                    $argument instanceof Node\Identifier) {
                    

private function getPrimary(): AbstractExpression
    {
        $token = $this->parser->getCurrentToken();

        if ($this->isUnary($token)) {
            $operator = $this->unaryOperators[$token->getValue()];
            $this->parser->getStream()->next();
            $expr = $this->parseExpression($operator['precedence']);
            $class = $operator['class'];

            return $this->parsePostfixExpression(new $class($expr, $token->getLine()));
        } elseif ($token->test(/* Token::PUNCTUATION_TYPE */ 9, '(')) {
            $this->parser->getStream()->next();
            $expr = $this->parseExpression();
            $this->parser->getStream()->expect(/* Token::PUNCTUATION_TYPE */ 9, ')', 'An opened parenthesis is not properly closed');

            return $this->parsePostfixExpression($expr);
        }

        return $this->parsePrimaryExpression();
    }