Using the Code Analysis Tools with the Ruleset

This topic shows how you can use a custom ruleset to customize the severity of diagnostics produced by the code analysis tools that are part of the AL Language extension for Visual Studio Code.

Using rulesets with code analysis

First, create a simple project in AL.

  1. Press Alt + A, Alt + L to create a new project.
  2. Open the Command Palette by using the Ctrl+Shift+P shortcut and choose either User Settings or Workspace Settings.
  3. Copy the setting al.enableCodeAnalysis to the settings.json file and set it to true: "al.enableCodeAnalysis": true.
  4. Copy the setting al.codeanalyzers to the settings file and then use Ctrl+Space to pick from the available code analyzers. Separate the list of code analyzers with commas. For more information about the available analyzers, see AppSourceCop, CodeCop, PerTenantExtensionCop, and UICop.

At this point, the selected analyzers will be run on your project. Next, add some code to the project that will, in the following example, be used to demonstrate violations of the AA0001 "There must be exactly one space character on each side of a binary operator such as := + - AND OR =." code analysis rule.

Add your own code to the project

In the Visual Studio Code Explorer, open the file and replace the existing code with the following:

pageextension 50100 CustomerListExt extends "Customer List"
    trigger OnOpenPage();
        result: Integer;
        // The following line will trigger the warning
        // AA0001 "There must be exactly one space character on each side 
        // of a binary operator such as := + - AND OR =." 
        result := 2+2; 
        Message('2 + 2 = ' + Format(result));

On the View tab of Visual Studio Code, select the Problems option and you will see a warning with the message "There must be exactly one space character on each side of '+'.". In this case, the problem can be fixed by running the AL Formatter command. For more information, see AL Formatter.

Creating and customizing a ruleset

To create and customize a ruleset of your own, follow the next steps:

  1. On the File tab in Visual Studio Code, choose New File.

  2. Save the empty file with a name, for example <name>.ruleset.json and make a note of the file path.

  3. Add the following code to the <name>.ruleset.json file:

        "name": "My Custom ruleset",
        "rules": [
                "id": "AA0001",                    
                "action": "None"
  4. In your project settings set al.ruleSetPath to the path to the <name>.ruleset.json file, relative to the project root. For more information about custom rules, see Ruleset for the Code Analysis Tool.


Use the truleset and trule snippets provided by the AL Language extension to create your ruleset. The ruleset will be applied to all the analyzers enabled for the current project. For more information about selectively enabling analyzers, see Using the Code Analysis Tools.

Running the code analysis

The code analysis will run in the background and you will see the warning "There must be exactly one space character on each side of '+'." disappear from the Problems option in Visual Studio Code.

To trigger a new compilation manually, use the Ctrl+Shift+B shortcut to build your project. For more information about AL keyboard shortcuts, see Keyboard shortcuts.


Changing the contents of the ruleset file will not be detected by the AL Language extension. To see the effects of changing the ruleset file, you can try any of the following:

  • Reload the window.
  • In the project settings, change the al.ruleSetPath setting to an invalid path. Save the settings file, change back the setting, and save it.

See also

Ruleset for the Code Analysis Tool
Using the Code Analysis Tools
Directives in AL
Development in AL
Debugging in AL
AL Language Extension Configuration