private function parsePrimaryExpression()

in src/Parser.php [1201:1297]
69 lines of code
41 McCabe index (conditional complexity)

    private function parsePrimaryExpression($parentNode) {
        $token = $this->getCurrentToken();
        switch ($token->kind) {
            // variable-name
            case TokenKind::VariableName: // TODO special case $this
            case TokenKind::DollarToken:
                return $this->parseSimpleVariable($parentNode);

            // qualified-name
            case TokenKind::Name: // TODO Qualified name
            case TokenKind::BackslashToken:
            case TokenKind::NamespaceKeyword:
                return $this->parseQualifiedName($parentNode);

            case TokenKind::DecimalLiteralToken: // TODO merge dec, oct, hex, bin, float -> NumericLiteral
            case TokenKind::OctalLiteralToken:
            case TokenKind::HexadecimalLiteralToken:
            case TokenKind::BinaryLiteralToken:
            case TokenKind::FloatingLiteralToken:
            case TokenKind::InvalidOctalLiteralToken:
            case TokenKind::InvalidHexadecimalLiteral:
            case TokenKind::InvalidBinaryLiteral:
            case TokenKind::IntegerLiteralToken:
                return $this->parseNumericLiteralExpression($parentNode);

            case TokenKind::StringLiteralToken:
                return $this->parseStringLiteralExpression($parentNode);

            case TokenKind::DoubleQuoteToken:
            case TokenKind::SingleQuoteToken:
            case TokenKind::HeredocStart:
            case TokenKind::BacktickToken:
                return $this->parseStringLiteralExpression2($parentNode);

            // TODO constant-expression

            // array-creation-expression
            case TokenKind::ArrayKeyword:
            case TokenKind::OpenBracketToken:
                return $this->parseArrayCreationExpression($parentNode);

            // intrinsic-construct
            case TokenKind::ListKeyword:
                return $this->parseListIntrinsicExpression($parentNode);

            // intrinsic-operator
            case TokenKind::EmptyKeyword:
                return $this->parseEmptyIntrinsicExpression($parentNode);
            case TokenKind::EvalKeyword:
                return $this->parseEvalIntrinsicExpression($parentNode);

            case TokenKind::ExitKeyword:
            case TokenKind::DieKeyword:
                return $this->parseExitIntrinsicExpression($parentNode);

            case TokenKind::IsSetKeyword:
                return $this->parseIssetIntrinsicExpression($parentNode);

            case TokenKind::PrintKeyword:
                return $this->parsePrintIntrinsicExpression($parentNode);

            // ( expression )
            case TokenKind::OpenParenToken:
                return $this->parseParenthesizedExpression($parentNode);

            // anonymous-function-creation-expression
            case TokenKind::AttributeToken:
                return $this->parseAttributeExpression($parentNode);

            case TokenKind::StaticKeyword:
                // handle `static::`, `static(`, `new static;`, `instanceof static`
                if (!$this->lookahead([TokenKind::FunctionKeyword, TokenKind::FnKeyword])) {
                    // TODO: Should this check the parent type to reject `$x = static;`, `$x = static();`, etc.
                    return $this->parseStaticQualifiedName($parentNode);
                }
                // Could be `static function` anonymous function creation expression, so flow through
            case TokenKind::FunctionKeyword:
            case TokenKind::FnKeyword:
                return $this->parseAnonymousFunctionCreationExpression($parentNode);

            case TokenKind::TrueReservedWord:
            case TokenKind::FalseReservedWord:
            case TokenKind::NullReservedWord:
                // handle `true::`, `true(`, `true\`
                if ($this->lookahead([TokenKind::BackslashToken, TokenKind::ColonColonToken, TokenKind::OpenParenToken])) {
                    return $this->parseQualifiedName($parentNode);
                }
                return $this->parseReservedWordExpression($parentNode);
            case TokenKind::MatchKeyword:
                return $this->parseMatchExpression($parentNode);
        }
        if (\in_array($token->kind, TokenStringMaps::RESERVED_WORDS)) {
            return $this->parseQualifiedName($parentNode);
        }

        return new MissingToken(TokenKind::Expression, $token->fullStart);
    }