private validateSeverity()

in DevSkim-VSCode-Plugin/server/src/utility_classes/ruleValidator.ts [708:771]
47 lines of code
11 McCabe index (conditional complexity)

    private validateSeverity(loadedRule): string
    {
        this.checkValue(loadedRule.severity, loadedRule, "string", "severity value is missing from object", OutputAlert.Error);
        let outcome: OutputMessages = Object.create(null);

        let severity: string = loadedRule.severity.toLowerCase();

        //check if severity is one of the expected values, or a common error that can easily be changed into an expected value
        switch (severity)
        {
            case "critical":
            case "important":
            case "moderate":
            case "best-practice":
            case "manual-review":
                return severity;

            //the schema used to use _ for multiword values, but now uses -.  check to see if any of those old values are
            //accidentally present
            case "manual_review":
                outcome.alert = OutputAlert.Warning;
                outcome.message = "severities ''manual_review' should be 'manual-review'";
                outcome.ruleid = loadedRule.id;
                outcome.file = loadedRule.filepath;
                this.outputMessages.push(outcome);

                this.writeoutNewRules = true;
                return "manual-review";

            case "best_practice":
                outcome.alert = OutputAlert.Warning;
                outcome.message = "severities ''best_practice' should be 'best-practice' have been replaced with 'best-practice'";
                outcome.ruleid = loadedRule.id;
                outcome.file = loadedRule.filepath;
                this.outputMessages.push(outcome);

                this.writeoutNewRules = true;
                return "best-practice";

            //we rolled low & defense-in-depth into a single "best-practice" level, but there may still be some old rules
            //with the old values
            case "low":
            case "defense-in-depth":
            case "defense_in_depth":
                outcome.alert = OutputAlert.Warning;
                outcome.message = "severities 'low' and 'defense-in-depth' have been replaced with 'best-practice'";
                outcome.ruleid = loadedRule.id;
                outcome.file = loadedRule.filepath;

                this.outputMessages.push(outcome);

                this.writeoutNewRules = true;
                return "best-practice";
        }

        //if we made it this far, severity isn't any value we recognize, and it needs to be.  Write an error message and throw an exception
        outcome.alert = OutputAlert.Error;
        outcome.message = "Unknown severity in rule.  Please see documentation at https://github.com/microsoft/devskim/wiki";
        outcome.ruleid = loadedRule.id;
        outcome.file = loadedRule.filepath;

        this.outputMessages.push(outcome);
        throw "Unknown severity in rule.  Please see documentation at https://github.com/microsoft/devskim/wiki";
    }