# Rules to Check

Each language (VHDL, Verilog/SystemVerilog, HDL, Tcl) comes with a default quality profile (i.e.: Set of rules to
check). Rules activated in this default quality profile are supposed to be applicable in most contexts.

Linty provides two scan engines:

* **Linter**: To detect issues based on source code analysis. Issues detected are about maintainability of your code
  (naming conventions, coding standards, complexity, etc.). Those rules are
  tagged [`linter`](https://demo.linty-services.com/coding_rules?tags=linter).
* **BugFinder**: To detect issues based on synthesized code analysis. Issues detected are about reliability (bugs) and
  maintainability. Those rules are tagged [`bug-finder`](https://demo.linty-services.com/coding_rules?tags=bug-finder).

We recommend to create your own quality profile(s) to accurately match your requirements. You can create as many quality
profiles as you wish.

## Create Quality Profile

To create a new quality profile, we recommend to copy the default profile and customize it. To do so, go to **Quality
Profiles** and click on the **Create button** (top-right corner):

![Create Quality Profile](../assets/images/rules-to-check/create-quality-profile.png)

## Configure Quality Profile

Configure your quality profile to match your requirements.

### Activate New Rules

Browse your quality profile and click on the **Inactive** rules:

![Inactive Rules](../assets/images/rules-to-check/inactive-rules.png)

Activate rules that you find valuable in your context:

![Activate Rule](../assets/images/rules-to-check/inactive-rules.png)

Then, you can set severity and parameters:

![Set rule severity and parameters](../assets/images/rules-to-check/update-rule.png)

### Deactivate Rules

Browse your quality profile and click on the **Active** rules:

![Active Rules](../assets/images/rules-to-check/active-rules.png)

Deactivate rules that you do not find valuable in your context:

![Deactivate Rule](../assets/images/rules-to-check/deactivate-rules.png)

See [SonarQube Quality Profiles official documentation](https://docs.sonarqube.org/latest/instance-administration/quality-profiles/)
for more details.

## Set Quality Profile to Use

For each project, you can configure which quality profiles to use. Browse your project and go to **Project Settings >
Quality Profiles**.

## Rules with `beta` Tag

A rule with a `beta` tag means that it is not yet fully accurate. Either, it raises too many false positives or
it misses too many issues (too many false negatives).