Expr addSubIntervalExpr()

in src/main/user-impl/java/com/mysql/cj/xdevapi/ExprParser.java [945:984]
31 lines of code
25 McCabe index (conditional complexity)

    Expr addSubIntervalExpr() {
        Expr lhs = atomicExpr();
        while ((currentTokenTypeEquals(TokenType.PLUS) || currentTokenTypeEquals(TokenType.MINUS)) && nextTokenTypeEquals(TokenType.INTERVAL)) {
            Token op = this.tokens.get(this.tokenPos);
            this.tokenPos++;
            Operator.Builder builder = Operator.newBuilder().addParam(lhs);

            // INTERVAL expression
            consumeToken(TokenType.INTERVAL);

            if (op.type == TokenType.PLUS) {
                builder.setName("date_add");
            } else {
                builder.setName("date_sub");
            }

            builder.addParam(bitExpr()); // amount

            // ensure next token is an interval unit
            if (currentTokenTypeEquals(TokenType.MICROSECOND) || currentTokenTypeEquals(TokenType.SECOND) || currentTokenTypeEquals(TokenType.MINUTE)
                    || currentTokenTypeEquals(TokenType.HOUR) || currentTokenTypeEquals(TokenType.DAY) || currentTokenTypeEquals(TokenType.WEEK)
                    || currentTokenTypeEquals(TokenType.MONTH) || currentTokenTypeEquals(TokenType.QUARTER) || currentTokenTypeEquals(TokenType.YEAR)
                    || currentTokenTypeEquals(TokenType.SECOND_MICROSECOND) || currentTokenTypeEquals(TokenType.MINUTE_MICROSECOND)
                    || currentTokenTypeEquals(TokenType.MINUTE_SECOND) || currentTokenTypeEquals(TokenType.HOUR_MICROSECOND)
                    || currentTokenTypeEquals(TokenType.HOUR_SECOND) || currentTokenTypeEquals(TokenType.HOUR_MINUTE)
                    || currentTokenTypeEquals(TokenType.DAY_MICROSECOND) || currentTokenTypeEquals(TokenType.DAY_SECOND)
                    || currentTokenTypeEquals(TokenType.DAY_MINUTE) || currentTokenTypeEquals(TokenType.DAY_HOUR)
                    || currentTokenTypeEquals(TokenType.YEAR_MONTH)) {
            } else {
                throw new WrongArgumentException("Expected interval units at " + this.tokenPos);
            }
            // xplugin demands that intervals be sent uppercase
            // TODO: we need to propagate the appropriate encoding here? it's ascii but it might not *always* be a superset encoding??
            builder.addParam(ExprUtil.buildLiteralScalar(this.tokens.get(this.tokenPos).value.toUpperCase().getBytes()));
            this.tokenPos++;

            lhs = Expr.newBuilder().setType(Expr.Type.OPERATOR).setOperator(builder.build()).build();
        }
        return lhs;
    }